diff --git a/vendor/google.golang.org/genproto/LICENSE b/vendor/google.golang.org/genproto/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/vendor/google.golang.org/genproto/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
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+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          excluding those notices that do not pertain to any part of
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+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
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+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go b/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go
new file mode 100644
index 0000000..0b9907f
--- /dev/null
+++ b/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go
@@ -0,0 +1,163 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/rpc/status.proto
+
+package status
+
+import (
+	fmt "fmt"
+	math "math"
+
+	proto "github.com/golang/protobuf/proto"
+	any "github.com/golang/protobuf/ptypes/any"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// The `Status` type defines a logical error model that is suitable for
+// different programming environments, including REST APIs and RPC APIs. It is
+// used by [gRPC](https://github.com/grpc). The error model is designed to be:
+//
+// - Simple to use and understand for most users
+// - Flexible enough to meet unexpected needs
+//
+// # Overview
+//
+// The `Status` message contains three pieces of data: error code, error
+// message, and error details. The error code should be an enum value of
+// [google.rpc.Code][google.rpc.Code], but it may accept additional error codes
+// if needed.  The error message should be a developer-facing English message
+// that helps developers *understand* and *resolve* the error. If a localized
+// user-facing error message is needed, put the localized message in the error
+// details or localize it in the client. The optional error details may contain
+// arbitrary information about the error. There is a predefined set of error
+// detail types in the package `google.rpc` that can be used for common error
+// conditions.
+//
+// # Language mapping
+//
+// The `Status` message is the logical representation of the error model, but it
+// is not necessarily the actual wire format. When the `Status` message is
+// exposed in different client libraries and different wire protocols, it can be
+// mapped differently. For example, it will likely be mapped to some exceptions
+// in Java, but more likely mapped to some error codes in C.
+//
+// # Other uses
+//
+// The error model and the `Status` message can be used in a variety of
+// environments, either with or without APIs, to provide a
+// consistent developer experience across different environments.
+//
+// Example uses of this error model include:
+//
+// - Partial errors. If a service needs to return partial errors to the client,
+//     it may embed the `Status` in the normal response to indicate the partial
+//     errors.
+//
+// - Workflow errors. A typical workflow has multiple steps. Each step may
+//     have a `Status` message for error reporting.
+//
+// - Batch operations. If a client uses batch request and batch response, the
+//     `Status` message should be used directly inside batch response, one for
+//     each error sub-response.
+//
+// - Asynchronous operations. If an API call embeds asynchronous operation
+//     results in its response, the status of those operations should be
+//     represented directly using the `Status` message.
+//
+// - Logging. If some API errors are stored in logs, the message `Status` could
+//     be used directly after any stripping needed for security/privacy reasons.
+type Status struct {
+	// The status code, which should be an enum value of
+	// [google.rpc.Code][google.rpc.Code].
+	Code int32 `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
+	// A developer-facing error message, which should be in English. Any
+	// user-facing error message should be localized and sent in the
+	// [google.rpc.Status.details][google.rpc.Status.details] field, or localized
+	// by the client.
+	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+	// A list of messages that carry the error details.  There is a common set of
+	// message types for APIs to use.
+	Details              []*any.Any `protobuf:"bytes,3,rep,name=details,proto3" json:"details,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}   `json:"-"`
+	XXX_unrecognized     []byte     `json:"-"`
+	XXX_sizecache        int32      `json:"-"`
+}
+
+func (m *Status) Reset()         { *m = Status{} }
+func (m *Status) String() string { return proto.CompactTextString(m) }
+func (*Status) ProtoMessage()    {}
+func (*Status) Descriptor() ([]byte, []int) {
+	return fileDescriptor_24d244abaf643bfe, []int{0}
+}
+
+func (m *Status) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Status.Unmarshal(m, b)
+}
+func (m *Status) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Status.Marshal(b, m, deterministic)
+}
+func (m *Status) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status.Merge(m, src)
+}
+func (m *Status) XXX_Size() int {
+	return xxx_messageInfo_Status.Size(m)
+}
+func (m *Status) XXX_DiscardUnknown() {
+	xxx_messageInfo_Status.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Status proto.InternalMessageInfo
+
+func (m *Status) GetCode() int32 {
+	if m != nil {
+		return m.Code
+	}
+	return 0
+}
+
+func (m *Status) GetMessage() string {
+	if m != nil {
+		return m.Message
+	}
+	return ""
+}
+
+func (m *Status) GetDetails() []*any.Any {
+	if m != nil {
+		return m.Details
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*Status)(nil), "google.rpc.Status")
+}
+
+func init() { proto.RegisterFile("google/rpc/status.proto", fileDescriptor_24d244abaf643bfe) }
+
+var fileDescriptor_24d244abaf643bfe = []byte{
+	// 209 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0x4f, 0xcf, 0xcf, 0x4f,
+	0xcf, 0x49, 0xd5, 0x2f, 0x2a, 0x48, 0xd6, 0x2f, 0x2e, 0x49, 0x2c, 0x29, 0x2d, 0xd6, 0x2b, 0x28,
+	0xca, 0x2f, 0xc9, 0x17, 0xe2, 0x82, 0x48, 0xe8, 0x15, 0x15, 0x24, 0x4b, 0x49, 0x42, 0x15, 0x81,
+	0x65, 0x92, 0x4a, 0xd3, 0xf4, 0x13, 0xf3, 0x2a, 0x21, 0xca, 0x94, 0xd2, 0xb8, 0xd8, 0x82, 0xc1,
+	0xda, 0x84, 0x84, 0xb8, 0x58, 0x92, 0xf3, 0x53, 0x52, 0x25, 0x18, 0x15, 0x18, 0x35, 0x58, 0x83,
+	0xc0, 0x6c, 0x21, 0x09, 0x2e, 0xf6, 0xdc, 0xd4, 0xe2, 0xe2, 0xc4, 0xf4, 0x54, 0x09, 0x26, 0x05,
+	0x46, 0x0d, 0xce, 0x20, 0x18, 0x57, 0x48, 0x8f, 0x8b, 0x3d, 0x25, 0xb5, 0x24, 0x31, 0x33, 0xa7,
+	0x58, 0x82, 0x59, 0x81, 0x59, 0x83, 0xdb, 0x48, 0x44, 0x0f, 0x6a, 0x21, 0xcc, 0x12, 0x3d, 0xc7,
+	0xbc, 0xca, 0x20, 0x98, 0x22, 0xa7, 0x38, 0x2e, 0xbe, 0xe4, 0xfc, 0x5c, 0x3d, 0x84, 0xa3, 0x9c,
+	0xb8, 0x21, 0xf6, 0x06, 0x80, 0x94, 0x07, 0x30, 0x46, 0x99, 0x43, 0xa5, 0xd2, 0xf3, 0x73, 0x12,
+	0xf3, 0xd2, 0xf5, 0xf2, 0x8b, 0xd2, 0xf5, 0xd3, 0x53, 0xf3, 0xc0, 0x86, 0xe9, 0x43, 0xa4, 0x12,
+	0x0b, 0x32, 0x8b, 0x91, 0xfc, 0x69, 0x0d, 0xa1, 0x16, 0x31, 0x31, 0x07, 0x05, 0x38, 0x27, 0xb1,
+	0x81, 0x55, 0x1a, 0x03, 0x02, 0x00, 0x00, 0xff, 0xff, 0xa4, 0x53, 0xf0, 0x7c, 0x10, 0x01, 0x00,
+	0x00,
+}
diff --git a/vendor/google.golang.org/grpc/.travis.yml b/vendor/google.golang.org/grpc/.travis.yml
new file mode 100644
index 0000000..819c1e2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/.travis.yml
@@ -0,0 +1,42 @@
+language: go
+
+matrix:
+  include:
+  - go: 1.13.x
+    env: VET=1 GO111MODULE=on
+  - go: 1.13.x
+    env: RACE=1 GO111MODULE=on
+  - go: 1.13.x
+    env: RUN386=1
+  - go: 1.13.x
+    env: GRPC_GO_RETRY=on
+  - go: 1.13.x
+    env: TESTEXTRAS=1
+  - go: 1.12.x
+    env: GO111MODULE=on
+  - go: 1.11.x
+    env: GO111MODULE=on
+  - go: 1.9.x
+    env: GAE=1
+
+go_import_path: google.golang.org/grpc
+
+before_install:
+  - if [[ "${GO111MODULE}" = "on" ]]; then mkdir "${HOME}/go"; export GOPATH="${HOME}/go"; fi
+  - if [[ -n "${RUN386}" ]]; then export GOARCH=386; fi
+  - if [[ "${TRAVIS_EVENT_TYPE}" = "cron" && -z "${RUN386}" ]]; then RACE=1; fi
+  - if [[ "${TRAVIS_EVENT_TYPE}" != "cron" ]]; then export VET_SKIP_PROTO=1; fi
+
+install:
+  - try3() { eval "$*" || eval "$*" || eval "$*"; }
+  - try3 'if [[ "${GO111MODULE}" = "on" ]]; then go mod download; else make testdeps; fi'
+  - if [[ -n "${GAE}" ]]; then source ./install_gae.sh; make testappenginedeps; fi
+  - if [[ -n "${VET}" ]]; then ./vet.sh -install; fi
+
+script:
+  - set -e
+  - if [[ -n "${TESTEXTRAS}" ]]; then examples/examples_test.sh; interop/interop_test.sh; exit 0; fi
+  - if [[ -n "${VET}" ]]; then ./vet.sh; fi
+  - if [[ -n "${GAE}" ]]; then make testappengine; exit 0; fi
+  - if [[ -n "${RACE}" ]]; then make testrace; exit 0; fi
+  - make test
diff --git a/vendor/google.golang.org/grpc/AUTHORS b/vendor/google.golang.org/grpc/AUTHORS
new file mode 100644
index 0000000..e491a9e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/AUTHORS
@@ -0,0 +1 @@
+Google Inc.
diff --git a/vendor/google.golang.org/grpc/CODE-OF-CONDUCT.md b/vendor/google.golang.org/grpc/CODE-OF-CONDUCT.md
new file mode 100644
index 0000000..9d4213e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/CODE-OF-CONDUCT.md
@@ -0,0 +1,3 @@
+## Community Code of Conduct
+
+gRPC follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
diff --git a/vendor/google.golang.org/grpc/CONTRIBUTING.md b/vendor/google.golang.org/grpc/CONTRIBUTING.md
new file mode 100644
index 0000000..4f1567e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/CONTRIBUTING.md
@@ -0,0 +1,62 @@
+# How to contribute
+
+We definitely welcome your patches and contributions to gRPC! Please read the gRPC
+organization's [governance rules](https://github.com/grpc/grpc-community/blob/master/governance.md)
+and [contribution guidelines](https://github.com/grpc/grpc-community/blob/master/CONTRIBUTING.md) before proceeding.
+
+If you are new to github, please start by reading [Pull Request howto](https://help.github.com/articles/about-pull-requests/)
+
+## Legal requirements
+
+In order to protect both you and ourselves, you will need to sign the
+[Contributor License Agreement](https://identity.linuxfoundation.org/projects/cncf).
+
+## Guidelines for Pull Requests
+How to get your contributions merged smoothly and quickly.
+
+- Create **small PRs** that are narrowly focused on **addressing a single
+  concern**. We often times receive PRs that are trying to fix several things at
+  a time, but only one fix is considered acceptable, nothing gets merged and
+  both author's & review's time is wasted. Create more PRs to address different
+  concerns and everyone will be happy.
+
+- The grpc package should only depend on standard Go packages and a small number
+  of exceptions. If your contribution introduces new dependencies which are NOT
+  in the [list](https://godoc.org/google.golang.org/grpc?imports), you need a
+  discussion with gRPC-Go authors and consultants.
+
+- For speculative changes, consider opening an issue and discussing it first. If
+  you are suggesting a behavioral or API change, consider starting with a [gRFC
+  proposal](https://github.com/grpc/proposal).
+
+- Provide a good **PR description** as a record of **what** change is being made
+  and **why** it was made. Link to a github issue if it exists.
+
+- Don't fix code style and formatting unless you are already changing that line
+  to address an issue. PRs with irrelevant changes won't be merged. If you do
+  want to fix formatting or style, do that in a separate PR.
+
+- Unless your PR is trivial, you should expect there will be reviewer comments
+  that you'll need to address before merging. We expect you to be reasonably
+  responsive to those comments, otherwise the PR will be closed after 2-3 weeks
+  of inactivity.
+
+- Maintain **clean commit history** and use **meaningful commit messages**. PRs
+  with messy commit history are difficult to review and won't be merged. Use
+  `rebase -i upstream/master` to curate your commit history and/or to bring in
+  latest changes from master (but avoid rebasing in the middle of a code
+  review).
+
+- Keep your PR up to date with upstream/master (if there are merge conflicts, we
+  can't really merge your change).
+
+- **All tests need to be passing** before your change can be merged. We
+  recommend you **run tests locally** before creating your PR to catch breakages
+  early on.
+  - `make all` to test everything, OR
+  - `make vet` to catch vet errors
+  - `make test` to run the tests
+  - `make testrace` to run tests in race mode
+  - optional `make testappengine` to run tests with appengine
+
+- Exceptions to the rules can be made if there's a compelling reason for doing so.
diff --git a/vendor/google.golang.org/grpc/GOVERNANCE.md b/vendor/google.golang.org/grpc/GOVERNANCE.md
new file mode 100644
index 0000000..d6ff267
--- /dev/null
+++ b/vendor/google.golang.org/grpc/GOVERNANCE.md
@@ -0,0 +1 @@
+This repository is governed by the gRPC organization's [governance rules](https://github.com/grpc/grpc-community/blob/master/governance.md).
diff --git a/vendor/google.golang.org/grpc/LICENSE b/vendor/google.golang.org/grpc/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/vendor/google.golang.org/grpc/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Work" shall mean the work of authorship, whether in Source or
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+      form, that is based on (or derived from) the Work and for which the
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+      of this License, Derivative Works shall not include works that remain
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+      "Contribution" shall mean any work of authorship, including
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/vendor/google.golang.org/grpc/MAINTAINERS.md b/vendor/google.golang.org/grpc/MAINTAINERS.md
new file mode 100644
index 0000000..093c82b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/MAINTAINERS.md
@@ -0,0 +1,27 @@
+This page lists all active maintainers of this repository. If you were a
+maintainer and would like to add your name to the Emeritus list, please send us a
+PR.
+
+See [GOVERNANCE.md](https://github.com/grpc/grpc-community/blob/master/governance.md)
+for governance guidelines and how to become a maintainer.
+See [CONTRIBUTING.md](https://github.com/grpc/grpc-community/blob/master/CONTRIBUTING.md)
+for general contribution guidelines.
+
+## Maintainers (in alphabetical order)
+- [canguler](https://github.com/canguler), Google LLC
+- [cesarghali](https://github.com/cesarghali), Google LLC
+- [dfawley](https://github.com/dfawley), Google LLC
+- [easwars](https://github.com/easwars), Google LLC
+- [jadekler](https://github.com/jadekler), Google LLC
+- [menghanl](https://github.com/menghanl), Google LLC
+- [srini100](https://github.com/srini100), Google LLC
+
+## Emeritus Maintainers (in alphabetical order)
+- [adelez](https://github.com/adelez), Google LLC
+- [iamqizhao](https://github.com/iamqizhao), Google LLC
+- [jtattermusch](https://github.com/jtattermusch), Google LLC
+- [lyuxuan](https://github.com/lyuxuan), Google LLC
+- [makmukhi](https://github.com/makmukhi), Google LLC
+- [matt-kwong](https://github.com/matt-kwong), Google LLC
+- [nicolasnoble](https://github.com/nicolasnoble), Google LLC
+- [yongni](https://github.com/yongni), Google LLC
diff --git a/vendor/google.golang.org/grpc/Makefile b/vendor/google.golang.org/grpc/Makefile
new file mode 100644
index 0000000..db982aa
--- /dev/null
+++ b/vendor/google.golang.org/grpc/Makefile
@@ -0,0 +1,60 @@
+all: vet test testrace
+
+build: deps
+	go build google.golang.org/grpc/...
+
+clean:
+	go clean -i google.golang.org/grpc/...
+
+deps:
+	go get -d -v google.golang.org/grpc/...
+
+proto:
+	@ if ! which protoc > /dev/null; then \
+		echo "error: protoc not installed" >&2; \
+		exit 1; \
+	fi
+	go generate google.golang.org/grpc/...
+
+test: testdeps
+	go test -cpu 1,4 -timeout 7m google.golang.org/grpc/...
+
+testappengine: testappenginedeps
+	goapp test -cpu 1,4 -timeout 7m google.golang.org/grpc/...
+
+testappenginedeps:
+	goapp get -d -v -t -tags 'appengine appenginevm' google.golang.org/grpc/...
+
+testdeps:
+	go get -d -v -t google.golang.org/grpc/...
+
+testrace: testdeps
+	go test -race -cpu 1,4 -timeout 7m google.golang.org/grpc/...
+
+updatedeps:
+	go get -d -v -u -f google.golang.org/grpc/...
+
+updatetestdeps:
+	go get -d -v -t -u -f google.golang.org/grpc/...
+
+vet: vetdeps
+	./vet.sh
+
+vetdeps:
+	./vet.sh -install
+
+.PHONY: \
+	all \
+	build \
+	clean \
+	deps \
+	proto \
+	test \
+	testappengine \
+	testappenginedeps \
+	testdeps \
+	testrace \
+	updatedeps \
+	updatetestdeps \
+	vet \
+	vetdeps
diff --git a/vendor/google.golang.org/grpc/README.md b/vendor/google.golang.org/grpc/README.md
new file mode 100644
index 0000000..afbc43d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/README.md
@@ -0,0 +1,121 @@
+# gRPC-Go
+
+[![Build Status](https://travis-ci.org/grpc/grpc-go.svg)](https://travis-ci.org/grpc/grpc-go)
+[![GoDoc](https://godoc.org/google.golang.org/grpc?status.svg)](https://godoc.org/google.golang.org/grpc)
+[![GoReportCard](https://goreportcard.com/badge/grpc/grpc-go)](https://goreportcard.com/report/github.com/grpc/grpc-go)
+
+The Go implementation of [gRPC](https://grpc.io/): A high performance, open
+source, general RPC framework that puts mobile and HTTP/2 first. For more
+information see the [gRPC Quick Start:
+Go](https://grpc.io/docs/quickstart/go.html) guide.
+
+Installation
+------------
+
+To install this package, you need to install Go and setup your Go workspace on
+your computer. The simplest way to install the library is to run:
+
+```
+$ go get -u google.golang.org/grpc
+```
+
+With Go module support (Go 1.11+), simply `import "google.golang.org/grpc"` in
+your source code and `go [build|run|test]` will automatically download the
+necessary dependencies ([Go modules
+ref](https://github.com/golang/go/wiki/Modules)).
+
+If you are trying to access grpc-go from within China, please see the
+[FAQ](#FAQ) below.
+
+Prerequisites
+-------------
+gRPC-Go requires Go 1.9 or later.
+
+Documentation
+-------------
+- See [godoc](https://godoc.org/google.golang.org/grpc) for package and API
+  descriptions.
+- Documentation on specific topics can be found in the [Documentation
+  directory](Documentation/).
+- Examples can be found in the [examples directory](examples/).
+
+Performance
+-----------
+Performance benchmark data for grpc-go and other languages is maintained in
+[this
+dashboard](https://performance-dot-grpc-testing.appspot.com/explore?dashboard=5652536396611584&widget=490377658&container=1286539696).
+
+Status
+------
+General Availability [Google Cloud Platform Launch
+Stages](https://cloud.google.com/terms/launch-stages).
+
+FAQ
+---
+
+#### I/O Timeout Errors
+
+The `golang.org` domain may be blocked from some countries.  `go get` usually
+produces an error like the following when this happens:
+
+```
+$ go get -u google.golang.org/grpc
+package google.golang.org/grpc: unrecognized import path "google.golang.org/grpc" (https fetch: Get https://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
+```
+
+To build Go code, there are several options:
+
+- Set up a VPN and access google.golang.org through that.
+
+- Without Go module support: `git clone` the repo manually:
+
+  ```
+  git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/grpc
+  ```
+
+  You will need to do the same for all of grpc's dependencies in `golang.org`,
+  e.g. `golang.org/x/net`.
+
+- With Go module support: it is possible to use the `replace` feature of `go
+  mod` to create aliases for golang.org packages.  In your project's directory:
+
+  ```
+  go mod edit -replace=google.golang.org/grpc=github.com/grpc/grpc-go@latest
+  go mod tidy
+  go mod vendor
+  go build -mod=vendor
+  ```
+
+  Again, this will need to be done for all transitive dependencies hosted on
+  golang.org as well.  Please refer to [this
+  issue](https://github.com/golang/go/issues/28652) in the golang repo regarding
+  this concern.
+
+#### Compiling error, undefined: grpc.SupportPackageIsVersion
+
+Please update proto package, gRPC package and rebuild the proto files:
+ - `go get -u github.com/golang/protobuf/{proto,protoc-gen-go}`
+ - `go get -u google.golang.org/grpc`
+ - `protoc --go_out=plugins=grpc:. *.proto`
+
+#### How to turn on logging
+
+The default logger is controlled by the environment variables. Turn everything
+on by setting:
+
+```
+GRPC_GO_LOG_VERBOSITY_LEVEL=99 GRPC_GO_LOG_SEVERITY_LEVEL=info
+```
+
+#### The RPC failed with error `"code = Unavailable desc = transport is closing"`
+
+This error means the connection the RPC is using was closed, and there are many
+possible reasons, including:
+ 1. mis-configured transport credentials, connection failed on handshaking
+ 1. bytes disrupted, possibly by a proxy in between
+ 1. server shutdown
+
+It can be tricky to debug this because the error happens on the client side but
+the root cause of the connection being closed is on the server side. Turn on
+logging on __both client and server__, and see if there are any transport
+errors.
diff --git a/vendor/google.golang.org/grpc/attributes/attributes.go b/vendor/google.golang.org/grpc/attributes/attributes.go
new file mode 100644
index 0000000..68ffc62
--- /dev/null
+++ b/vendor/google.golang.org/grpc/attributes/attributes.go
@@ -0,0 +1,70 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package attributes defines a generic key/value store used in various gRPC
+// components.
+//
+// All APIs in this package are EXPERIMENTAL.
+package attributes
+
+import "fmt"
+
+// Attributes is an immutable struct for storing and retrieving generic
+// key/value pairs.  Keys must be hashable, and users should define their own
+// types for keys.
+type Attributes struct {
+	m map[interface{}]interface{}
+}
+
+// New returns a new Attributes containing all key/value pairs in kvs.  If the
+// same key appears multiple times, the last value overwrites all previous
+// values for that key.  Panics if len(kvs) is not even.
+func New(kvs ...interface{}) *Attributes {
+	if len(kvs)%2 != 0 {
+		panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs)))
+	}
+	a := &Attributes{m: make(map[interface{}]interface{}, len(kvs)/2)}
+	for i := 0; i < len(kvs)/2; i++ {
+		a.m[kvs[i*2]] = kvs[i*2+1]
+	}
+	return a
+}
+
+// WithValues returns a new Attributes containing all key/value pairs in a and
+// kvs.  Panics if len(kvs) is not even.  If the same key appears multiple
+// times, the last value overwrites all previous values for that key.  To
+// remove an existing key, use a nil value.
+func (a *Attributes) WithValues(kvs ...interface{}) *Attributes {
+	if len(kvs)%2 != 0 {
+		panic(fmt.Sprintf("attributes.New called with unexpected input: len(kvs) = %v", len(kvs)))
+	}
+	n := &Attributes{m: make(map[interface{}]interface{}, len(a.m)+len(kvs)/2)}
+	for k, v := range a.m {
+		n.m[k] = v
+	}
+	for i := 0; i < len(kvs)/2; i++ {
+		n.m[kvs[i*2]] = kvs[i*2+1]
+	}
+	return n
+}
+
+// Value returns the value associated with these attributes for key, or nil if
+// no value is associated with key.
+func (a *Attributes) Value(key interface{}) interface{} {
+	return a.m[key]
+}
diff --git a/vendor/google.golang.org/grpc/backoff.go b/vendor/google.golang.org/grpc/backoff.go
new file mode 100644
index 0000000..ff7c3ee
--- /dev/null
+++ b/vendor/google.golang.org/grpc/backoff.go
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// See internal/backoff package for the backoff implementation. This file is
+// kept for the exported types and API backward compatibility.
+
+package grpc
+
+import (
+	"time"
+
+	"google.golang.org/grpc/backoff"
+)
+
+// DefaultBackoffConfig uses values specified for backoff in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+//
+// Deprecated: use ConnectParams instead. Will be supported throughout 1.x.
+var DefaultBackoffConfig = BackoffConfig{
+	MaxDelay: 120 * time.Second,
+}
+
+// BackoffConfig defines the parameters for the default gRPC backoff strategy.
+//
+// Deprecated: use ConnectParams instead. Will be supported throughout 1.x.
+type BackoffConfig struct {
+	// MaxDelay is the upper bound of backoff delay.
+	MaxDelay time.Duration
+}
+
+// ConnectParams defines the parameters for connecting and retrying. Users are
+// encouraged to use this instead of the BackoffConfig type defined above. See
+// here for more details:
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+//
+// This API is EXPERIMENTAL.
+type ConnectParams struct {
+	// Backoff specifies the configuration options for connection backoff.
+	Backoff backoff.Config
+	// MinConnectTimeout is the minimum amount of time we are willing to give a
+	// connection to complete.
+	MinConnectTimeout time.Duration
+}
diff --git a/vendor/google.golang.org/grpc/backoff/backoff.go b/vendor/google.golang.org/grpc/backoff/backoff.go
new file mode 100644
index 0000000..0787d0b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/backoff/backoff.go
@@ -0,0 +1,52 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package backoff provides configuration options for backoff.
+//
+// More details can be found at:
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+//
+// All APIs in this package are experimental.
+package backoff
+
+import "time"
+
+// Config defines the configuration options for backoff.
+type Config struct {
+	// BaseDelay is the amount of time to backoff after the first failure.
+	BaseDelay time.Duration
+	// Multiplier is the factor with which to multiply backoffs after a
+	// failed retry. Should ideally be greater than 1.
+	Multiplier float64
+	// Jitter is the factor with which backoffs are randomized.
+	Jitter float64
+	// MaxDelay is the upper bound of backoff delay.
+	MaxDelay time.Duration
+}
+
+// DefaultConfig is a backoff configuration with the default values specfied
+// at https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+//
+// This should be useful for callers who want to configure backoff with
+// non-default values only for a subset of the options.
+var DefaultConfig = Config{
+	BaseDelay:  1.0 * time.Second,
+	Multiplier: 1.6,
+	Jitter:     0.2,
+	MaxDelay:   120 * time.Second,
+}
diff --git a/vendor/google.golang.org/grpc/balancer.go b/vendor/google.golang.org/grpc/balancer.go
new file mode 100644
index 0000000..a8eb0f4
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer.go
@@ -0,0 +1,391 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"net"
+	"sync"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/naming"
+	"google.golang.org/grpc/status"
+)
+
+// Address represents a server the client connects to.
+//
+// Deprecated: please use package balancer.
+type Address struct {
+	// Addr is the server address on which a connection will be established.
+	Addr string
+	// Metadata is the information associated with Addr, which may be used
+	// to make load balancing decision.
+	Metadata interface{}
+}
+
+// BalancerConfig specifies the configurations for Balancer.
+//
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
+type BalancerConfig struct {
+	// DialCreds is the transport credential the Balancer implementation can
+	// use to dial to a remote load balancer server. The Balancer implementations
+	// can ignore this if it does not need to talk to another party securely.
+	DialCreds credentials.TransportCredentials
+	// Dialer is the custom dialer the Balancer implementation can use to dial
+	// to a remote load balancer server. The Balancer implementations
+	// can ignore this if it doesn't need to talk to remote balancer.
+	Dialer func(context.Context, string) (net.Conn, error)
+}
+
+// BalancerGetOptions configures a Get call.
+//
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
+type BalancerGetOptions struct {
+	// BlockingWait specifies whether Get should block when there is no
+	// connected address.
+	BlockingWait bool
+}
+
+// Balancer chooses network addresses for RPCs.
+//
+// Deprecated: please use package balancer.  May be removed in a future 1.x release.
+type Balancer interface {
+	// Start does the initialization work to bootstrap a Balancer. For example,
+	// this function may start the name resolution and watch the updates. It will
+	// be called when dialing.
+	Start(target string, config BalancerConfig) error
+	// Up informs the Balancer that gRPC has a connection to the server at
+	// addr. It returns down which is called once the connection to addr gets
+	// lost or closed.
+	// TODO: It is not clear how to construct and take advantage of the meaningful error
+	// parameter for down. Need realistic demands to guide.
+	Up(addr Address) (down func(error))
+	// Get gets the address of a server for the RPC corresponding to ctx.
+	// i) If it returns a connected address, gRPC internals issues the RPC on the
+	// connection to this address;
+	// ii) If it returns an address on which the connection is under construction
+	// (initiated by Notify(...)) but not connected, gRPC internals
+	//  * fails RPC if the RPC is fail-fast and connection is in the TransientFailure or
+	//  Shutdown state;
+	//  or
+	//  * issues RPC on the connection otherwise.
+	// iii) If it returns an address on which the connection does not exist, gRPC
+	// internals treats it as an error and will fail the corresponding RPC.
+	//
+	// Therefore, the following is the recommended rule when writing a custom Balancer.
+	// If opts.BlockingWait is true, it should return a connected address or
+	// block if there is no connected address. It should respect the timeout or
+	// cancellation of ctx when blocking. If opts.BlockingWait is false (for fail-fast
+	// RPCs), it should return an address it has notified via Notify(...) immediately
+	// instead of blocking.
+	//
+	// The function returns put which is called once the rpc has completed or failed.
+	// put can collect and report RPC stats to a remote load balancer.
+	//
+	// This function should only return the errors Balancer cannot recover by itself.
+	// gRPC internals will fail the RPC if an error is returned.
+	Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error)
+	// Notify returns a channel that is used by gRPC internals to watch the addresses
+	// gRPC needs to connect. The addresses might be from a name resolver or remote
+	// load balancer. gRPC internals will compare it with the existing connected
+	// addresses. If the address Balancer notified is not in the existing connected
+	// addresses, gRPC starts to connect the address. If an address in the existing
+	// connected addresses is not in the notification list, the corresponding connection
+	// is shutdown gracefully. Otherwise, there are no operations to take. Note that
+	// the Address slice must be the full list of the Addresses which should be connected.
+	// It is NOT delta.
+	Notify() <-chan []Address
+	// Close shuts down the balancer.
+	Close() error
+}
+
+// RoundRobin returns a Balancer that selects addresses round-robin. It uses r to watch
+// the name resolution updates and updates the addresses available correspondingly.
+//
+// Deprecated: please use package balancer/roundrobin. May be removed in a future 1.x release.
+func RoundRobin(r naming.Resolver) Balancer {
+	return &roundRobin{r: r}
+}
+
+type addrInfo struct {
+	addr      Address
+	connected bool
+}
+
+type roundRobin struct {
+	r      naming.Resolver
+	w      naming.Watcher
+	addrs  []*addrInfo // all the addresses the client should potentially connect
+	mu     sync.Mutex
+	addrCh chan []Address // the channel to notify gRPC internals the list of addresses the client should connect to.
+	next   int            // index of the next address to return for Get()
+	waitCh chan struct{}  // the channel to block when there is no connected address available
+	done   bool           // The Balancer is closed.
+}
+
+func (rr *roundRobin) watchAddrUpdates() error {
+	updates, err := rr.w.Next()
+	if err != nil {
+		grpclog.Warningf("grpc: the naming watcher stops working due to %v.", err)
+		return err
+	}
+	rr.mu.Lock()
+	defer rr.mu.Unlock()
+	for _, update := range updates {
+		addr := Address{
+			Addr:     update.Addr,
+			Metadata: update.Metadata,
+		}
+		switch update.Op {
+		case naming.Add:
+			var exist bool
+			for _, v := range rr.addrs {
+				if addr == v.addr {
+					exist = true
+					grpclog.Infoln("grpc: The name resolver wanted to add an existing address: ", addr)
+					break
+				}
+			}
+			if exist {
+				continue
+			}
+			rr.addrs = append(rr.addrs, &addrInfo{addr: addr})
+		case naming.Delete:
+			for i, v := range rr.addrs {
+				if addr == v.addr {
+					copy(rr.addrs[i:], rr.addrs[i+1:])
+					rr.addrs = rr.addrs[:len(rr.addrs)-1]
+					break
+				}
+			}
+		default:
+			grpclog.Errorln("Unknown update.Op ", update.Op)
+		}
+	}
+	// Make a copy of rr.addrs and write it onto rr.addrCh so that gRPC internals gets notified.
+	open := make([]Address, len(rr.addrs))
+	for i, v := range rr.addrs {
+		open[i] = v.addr
+	}
+	if rr.done {
+		return ErrClientConnClosing
+	}
+	select {
+	case <-rr.addrCh:
+	default:
+	}
+	rr.addrCh <- open
+	return nil
+}
+
+func (rr *roundRobin) Start(target string, config BalancerConfig) error {
+	rr.mu.Lock()
+	defer rr.mu.Unlock()
+	if rr.done {
+		return ErrClientConnClosing
+	}
+	if rr.r == nil {
+		// If there is no name resolver installed, it is not needed to
+		// do name resolution. In this case, target is added into rr.addrs
+		// as the only address available and rr.addrCh stays nil.
+		rr.addrs = append(rr.addrs, &addrInfo{addr: Address{Addr: target}})
+		return nil
+	}
+	w, err := rr.r.Resolve(target)
+	if err != nil {
+		return err
+	}
+	rr.w = w
+	rr.addrCh = make(chan []Address, 1)
+	go func() {
+		for {
+			if err := rr.watchAddrUpdates(); err != nil {
+				return
+			}
+		}
+	}()
+	return nil
+}
+
+// Up sets the connected state of addr and sends notification if there are pending
+// Get() calls.
+func (rr *roundRobin) Up(addr Address) func(error) {
+	rr.mu.Lock()
+	defer rr.mu.Unlock()
+	var cnt int
+	for _, a := range rr.addrs {
+		if a.addr == addr {
+			if a.connected {
+				return nil
+			}
+			a.connected = true
+		}
+		if a.connected {
+			cnt++
+		}
+	}
+	// addr is only one which is connected. Notify the Get() callers who are blocking.
+	if cnt == 1 && rr.waitCh != nil {
+		close(rr.waitCh)
+		rr.waitCh = nil
+	}
+	return func(err error) {
+		rr.down(addr, err)
+	}
+}
+
+// down unsets the connected state of addr.
+func (rr *roundRobin) down(addr Address, err error) {
+	rr.mu.Lock()
+	defer rr.mu.Unlock()
+	for _, a := range rr.addrs {
+		if addr == a.addr {
+			a.connected = false
+			break
+		}
+	}
+}
+
+// Get returns the next addr in the rotation.
+func (rr *roundRobin) Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error) {
+	var ch chan struct{}
+	rr.mu.Lock()
+	if rr.done {
+		rr.mu.Unlock()
+		err = ErrClientConnClosing
+		return
+	}
+
+	if len(rr.addrs) > 0 {
+		if rr.next >= len(rr.addrs) {
+			rr.next = 0
+		}
+		next := rr.next
+		for {
+			a := rr.addrs[next]
+			next = (next + 1) % len(rr.addrs)
+			if a.connected {
+				addr = a.addr
+				rr.next = next
+				rr.mu.Unlock()
+				return
+			}
+			if next == rr.next {
+				// Has iterated all the possible address but none is connected.
+				break
+			}
+		}
+	}
+	if !opts.BlockingWait {
+		if len(rr.addrs) == 0 {
+			rr.mu.Unlock()
+			err = status.Errorf(codes.Unavailable, "there is no address available")
+			return
+		}
+		// Returns the next addr on rr.addrs for failfast RPCs.
+		addr = rr.addrs[rr.next].addr
+		rr.next++
+		rr.mu.Unlock()
+		return
+	}
+	// Wait on rr.waitCh for non-failfast RPCs.
+	if rr.waitCh == nil {
+		ch = make(chan struct{})
+		rr.waitCh = ch
+	} else {
+		ch = rr.waitCh
+	}
+	rr.mu.Unlock()
+	for {
+		select {
+		case <-ctx.Done():
+			err = ctx.Err()
+			return
+		case <-ch:
+			rr.mu.Lock()
+			if rr.done {
+				rr.mu.Unlock()
+				err = ErrClientConnClosing
+				return
+			}
+
+			if len(rr.addrs) > 0 {
+				if rr.next >= len(rr.addrs) {
+					rr.next = 0
+				}
+				next := rr.next
+				for {
+					a := rr.addrs[next]
+					next = (next + 1) % len(rr.addrs)
+					if a.connected {
+						addr = a.addr
+						rr.next = next
+						rr.mu.Unlock()
+						return
+					}
+					if next == rr.next {
+						// Has iterated all the possible address but none is connected.
+						break
+					}
+				}
+			}
+			// The newly added addr got removed by Down() again.
+			if rr.waitCh == nil {
+				ch = make(chan struct{})
+				rr.waitCh = ch
+			} else {
+				ch = rr.waitCh
+			}
+			rr.mu.Unlock()
+		}
+	}
+}
+
+func (rr *roundRobin) Notify() <-chan []Address {
+	return rr.addrCh
+}
+
+func (rr *roundRobin) Close() error {
+	rr.mu.Lock()
+	defer rr.mu.Unlock()
+	if rr.done {
+		return errBalancerClosed
+	}
+	rr.done = true
+	if rr.w != nil {
+		rr.w.Close()
+	}
+	if rr.waitCh != nil {
+		close(rr.waitCh)
+		rr.waitCh = nil
+	}
+	if rr.addrCh != nil {
+		close(rr.addrCh)
+	}
+	return nil
+}
+
+// pickFirst is used to test multi-addresses in one addrConn in which all addresses share the same addrConn.
+// It is a wrapper around roundRobin balancer. The logic of all methods works fine because balancer.Get()
+// returns the only address Up by resetTransport().
+type pickFirst struct {
+	*roundRobin
+}
diff --git a/vendor/google.golang.org/grpc/balancer/balancer.go b/vendor/google.golang.org/grpc/balancer/balancer.go
new file mode 100644
index 0000000..531a174
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/balancer.go
@@ -0,0 +1,459 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package balancer defines APIs for load balancing in gRPC.
+// All APIs in this package are experimental.
+package balancer
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net"
+	"strings"
+
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+var (
+	// m is a map from name to balancer builder.
+	m = make(map[string]Builder)
+)
+
+// Register registers the balancer builder to the balancer map. b.Name
+// (lowercased) will be used as the name registered with this builder.  If the
+// Builder implements ConfigParser, ParseConfig will be called when new service
+// configs are received by the resolver, and the result will be provided to the
+// Balancer in UpdateClientConnState.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe. If multiple Balancers are
+// registered with the same name, the one registered last will take effect.
+func Register(b Builder) {
+	m[strings.ToLower(b.Name())] = b
+}
+
+// unregisterForTesting deletes the balancer with the given name from the
+// balancer map.
+//
+// This function is not thread-safe.
+func unregisterForTesting(name string) {
+	delete(m, name)
+}
+
+func init() {
+	internal.BalancerUnregister = unregisterForTesting
+}
+
+// Get returns the resolver builder registered with the given name.
+// Note that the compare is done in a case-insensitive fashion.
+// If no builder is register with the name, nil will be returned.
+func Get(name string) Builder {
+	if b, ok := m[strings.ToLower(name)]; ok {
+		return b
+	}
+	return nil
+}
+
+// SubConn represents a gRPC sub connection.
+// Each sub connection contains a list of addresses. gRPC will
+// try to connect to them (in sequence), and stop trying the
+// remainder once one connection is successful.
+//
+// The reconnect backoff will be applied on the list, not a single address.
+// For example, try_on_all_addresses -> backoff -> try_on_all_addresses.
+//
+// All SubConns start in IDLE, and will not try to connect. To trigger
+// the connecting, Balancers must call Connect.
+// When the connection encounters an error, it will reconnect immediately.
+// When the connection becomes IDLE, it will not reconnect unless Connect is
+// called.
+//
+// This interface is to be implemented by gRPC. Users should not need a
+// brand new implementation of this interface. For the situations like
+// testing, the new implementation should embed this interface. This allows
+// gRPC to add new methods to this interface.
+type SubConn interface {
+	// UpdateAddresses updates the addresses used in this SubConn.
+	// gRPC checks if currently-connected address is still in the new list.
+	// If it's in the list, the connection will be kept.
+	// If it's not in the list, the connection will gracefully closed, and
+	// a new connection will be created.
+	//
+	// This will trigger a state transition for the SubConn.
+	UpdateAddresses([]resolver.Address)
+	// Connect starts the connecting for this SubConn.
+	Connect()
+}
+
+// NewSubConnOptions contains options to create new SubConn.
+type NewSubConnOptions struct {
+	// CredsBundle is the credentials bundle that will be used in the created
+	// SubConn. If it's nil, the original creds from grpc DialOptions will be
+	// used.
+	CredsBundle credentials.Bundle
+	// HealthCheckEnabled indicates whether health check service should be
+	// enabled on this SubConn
+	HealthCheckEnabled bool
+}
+
+// State contains the balancer's state relevant to the gRPC ClientConn.
+type State struct {
+	// State contains the connectivity state of the balancer, which is used to
+	// determine the state of the ClientConn.
+	ConnectivityState connectivity.State
+	// Picker is used to choose connections (SubConns) for RPCs.
+	Picker V2Picker
+}
+
+// ClientConn represents a gRPC ClientConn.
+//
+// This interface is to be implemented by gRPC. Users should not need a
+// brand new implementation of this interface. For the situations like
+// testing, the new implementation should embed this interface. This allows
+// gRPC to add new methods to this interface.
+type ClientConn interface {
+	// NewSubConn is called by balancer to create a new SubConn.
+	// It doesn't block and wait for the connections to be established.
+	// Behaviors of the SubConn can be controlled by options.
+	NewSubConn([]resolver.Address, NewSubConnOptions) (SubConn, error)
+	// RemoveSubConn removes the SubConn from ClientConn.
+	// The SubConn will be shutdown.
+	RemoveSubConn(SubConn)
+
+	// UpdateBalancerState is called by balancer to notify gRPC that some internal
+	// state in balancer has changed.
+	//
+	// gRPC will update the connectivity state of the ClientConn, and will call pick
+	// on the new picker to pick new SubConn.
+	//
+	// Deprecated: use UpdateState instead
+	UpdateBalancerState(s connectivity.State, p Picker)
+
+	// UpdateState notifies gRPC that the balancer's internal state has
+	// changed.
+	//
+	// gRPC will update the connectivity state of the ClientConn, and will call pick
+	// on the new picker to pick new SubConns.
+	UpdateState(State)
+
+	// ResolveNow is called by balancer to notify gRPC to do a name resolving.
+	ResolveNow(resolver.ResolveNowOptions)
+
+	// Target returns the dial target for this ClientConn.
+	//
+	// Deprecated: Use the Target field in the BuildOptions instead.
+	Target() string
+}
+
+// BuildOptions contains additional information for Build.
+type BuildOptions struct {
+	// DialCreds is the transport credential the Balancer implementation can
+	// use to dial to a remote load balancer server. The Balancer implementations
+	// can ignore this if it does not need to talk to another party securely.
+	DialCreds credentials.TransportCredentials
+	// CredsBundle is the credentials bundle that the Balancer can use.
+	CredsBundle credentials.Bundle
+	// Dialer is the custom dialer the Balancer implementation can use to dial
+	// to a remote load balancer server. The Balancer implementations
+	// can ignore this if it doesn't need to talk to remote balancer.
+	Dialer func(context.Context, string) (net.Conn, error)
+	// ChannelzParentID is the entity parent's channelz unique identification number.
+	ChannelzParentID int64
+	// Target contains the parsed address info of the dial target. It is the same resolver.Target as
+	// passed to the resolver.
+	// See the documentation for the resolver.Target type for details about what it contains.
+	Target resolver.Target
+}
+
+// Builder creates a balancer.
+type Builder interface {
+	// Build creates a new balancer with the ClientConn.
+	Build(cc ClientConn, opts BuildOptions) Balancer
+	// Name returns the name of balancers built by this builder.
+	// It will be used to pick balancers (for example in service config).
+	Name() string
+}
+
+// ConfigParser parses load balancer configs.
+type ConfigParser interface {
+	// ParseConfig parses the JSON load balancer config provided into an
+	// internal form or returns an error if the config is invalid.  For future
+	// compatibility reasons, unknown fields in the config should be ignored.
+	ParseConfig(LoadBalancingConfigJSON json.RawMessage) (serviceconfig.LoadBalancingConfig, error)
+}
+
+// PickOptions is a type alias of PickInfo for legacy reasons.
+//
+// Deprecated: use PickInfo instead.
+type PickOptions = PickInfo
+
+// PickInfo contains additional information for the Pick operation.
+type PickInfo struct {
+	// FullMethodName is the method name that NewClientStream() is called
+	// with. The canonical format is /service/Method.
+	FullMethodName string
+	// Ctx is the RPC's context, and may contain relevant RPC-level information
+	// like the outgoing header metadata.
+	Ctx context.Context
+}
+
+// DoneInfo contains additional information for done.
+type DoneInfo struct {
+	// Err is the rpc error the RPC finished with. It could be nil.
+	Err error
+	// Trailer contains the metadata from the RPC's trailer, if present.
+	Trailer metadata.MD
+	// BytesSent indicates if any bytes have been sent to the server.
+	BytesSent bool
+	// BytesReceived indicates if any byte has been received from the server.
+	BytesReceived bool
+	// ServerLoad is the load received from server. It's usually sent as part of
+	// trailing metadata.
+	//
+	// The only supported type now is *orca_v1.LoadReport.
+	ServerLoad interface{}
+}
+
+var (
+	// ErrNoSubConnAvailable indicates no SubConn is available for pick().
+	// gRPC will block the RPC until a new picker is available via UpdateBalancerState().
+	ErrNoSubConnAvailable = errors.New("no SubConn is available")
+	// ErrTransientFailure indicates all SubConns are in TransientFailure.
+	// WaitForReady RPCs will block, non-WaitForReady RPCs will fail.
+	ErrTransientFailure = TransientFailureError(errors.New("all SubConns are in TransientFailure"))
+)
+
+// Picker is used by gRPC to pick a SubConn to send an RPC.
+// Balancer is expected to generate a new picker from its snapshot every time its
+// internal state has changed.
+//
+// The pickers used by gRPC can be updated by ClientConn.UpdateBalancerState().
+//
+// Deprecated: use V2Picker instead
+type Picker interface {
+	// Pick returns the SubConn to be used to send the RPC.
+	// The returned SubConn must be one returned by NewSubConn().
+	//
+	// This functions is expected to return:
+	// - a SubConn that is known to be READY;
+	// - ErrNoSubConnAvailable if no SubConn is available, but progress is being
+	//   made (for example, some SubConn is in CONNECTING mode);
+	// - other errors if no active connecting is happening (for example, all SubConn
+	//   are in TRANSIENT_FAILURE mode).
+	//
+	// If a SubConn is returned:
+	// - If it is READY, gRPC will send the RPC on it;
+	// - If it is not ready, or becomes not ready after it's returned, gRPC will
+	//   block until UpdateBalancerState() is called and will call pick on the
+	//   new picker. The done function returned from Pick(), if not nil, will be
+	//   called with nil error, no bytes sent and no bytes received.
+	//
+	// If the returned error is not nil:
+	// - If the error is ErrNoSubConnAvailable, gRPC will block until UpdateBalancerState()
+	// - If the error is ErrTransientFailure or implements IsTransientFailure()
+	//   bool, returning true:
+	//   - If the RPC is wait-for-ready, gRPC will block until UpdateBalancerState()
+	//     is called to pick again;
+	//   - Otherwise, RPC will fail with unavailable error.
+	// - Else (error is other non-nil error):
+	//   - The RPC will fail with the error's status code, or Unknown if it is
+	//     not a status error.
+	//
+	// The returned done() function will be called once the rpc has finished,
+	// with the final status of that RPC.  If the SubConn returned is not a
+	// valid SubConn type, done may not be called.  done may be nil if balancer
+	// doesn't care about the RPC status.
+	Pick(ctx context.Context, info PickInfo) (conn SubConn, done func(DoneInfo), err error)
+}
+
+// PickResult contains information related to a connection chosen for an RPC.
+type PickResult struct {
+	// SubConn is the connection to use for this pick, if its state is Ready.
+	// If the state is not Ready, gRPC will block the RPC until a new Picker is
+	// provided by the balancer (using ClientConn.UpdateState).  The SubConn
+	// must be one returned by ClientConn.NewSubConn.
+	SubConn SubConn
+
+	// Done is called when the RPC is completed.  If the SubConn is not ready,
+	// this will be called with a nil parameter.  If the SubConn is not a valid
+	// type, Done may not be called.  May be nil if the balancer does not wish
+	// to be notified when the RPC completes.
+	Done func(DoneInfo)
+}
+
+type transientFailureError struct {
+	error
+}
+
+func (e *transientFailureError) IsTransientFailure() bool { return true }
+
+// TransientFailureError wraps err in an error implementing
+// IsTransientFailure() bool, returning true.
+func TransientFailureError(err error) error {
+	return &transientFailureError{error: err}
+}
+
+// V2Picker is used by gRPC to pick a SubConn to send an RPC.
+// Balancer is expected to generate a new picker from its snapshot every time its
+// internal state has changed.
+//
+// The pickers used by gRPC can be updated by ClientConn.UpdateBalancerState().
+type V2Picker interface {
+	// Pick returns the connection to use for this RPC and related information.
+	//
+	// Pick should not block.  If the balancer needs to do I/O or any blocking
+	// or time-consuming work to service this call, it should return
+	// ErrNoSubConnAvailable, and the Pick call will be repeated by gRPC when
+	// the Picker is updated (using ClientConn.UpdateState).
+	//
+	// If an error is returned:
+	//
+	// - If the error is ErrNoSubConnAvailable, gRPC will block until a new
+	//   Picker is provided by the balancer (using ClientConn.UpdateState).
+	//
+	// - If the error implements IsTransientFailure() bool, returning true,
+	//   wait for ready RPCs will wait, but non-wait for ready RPCs will be
+	//   terminated with this error's Error() string and status code
+	//   Unavailable.
+	//
+	// - Any other errors terminate all RPCs with the code and message
+	//   provided.  If the error is not a status error, it will be converted by
+	//   gRPC to a status error with code Unknown.
+	Pick(info PickInfo) (PickResult, error)
+}
+
+// Balancer takes input from gRPC, manages SubConns, and collects and aggregates
+// the connectivity states.
+//
+// It also generates and updates the Picker used by gRPC to pick SubConns for RPCs.
+//
+// HandleSubConnectionStateChange, HandleResolvedAddrs and Close are guaranteed
+// to be called synchronously from the same goroutine.
+// There's no guarantee on picker.Pick, it may be called anytime.
+type Balancer interface {
+	// HandleSubConnStateChange is called by gRPC when the connectivity state
+	// of sc has changed.
+	// Balancer is expected to aggregate all the state of SubConn and report
+	// that back to gRPC.
+	// Balancer should also generate and update Pickers when its internal state has
+	// been changed by the new state.
+	//
+	// Deprecated: if V2Balancer is implemented by the Balancer,
+	// UpdateSubConnState will be called instead.
+	HandleSubConnStateChange(sc SubConn, state connectivity.State)
+	// HandleResolvedAddrs is called by gRPC to send updated resolved addresses to
+	// balancers.
+	// Balancer can create new SubConn or remove SubConn with the addresses.
+	// An empty address slice and a non-nil error will be passed if the resolver returns
+	// non-nil error to gRPC.
+	//
+	// Deprecated: if V2Balancer is implemented by the Balancer,
+	// UpdateClientConnState will be called instead.
+	HandleResolvedAddrs([]resolver.Address, error)
+	// Close closes the balancer. The balancer is not required to call
+	// ClientConn.RemoveSubConn for its existing SubConns.
+	Close()
+}
+
+// SubConnState describes the state of a SubConn.
+type SubConnState struct {
+	// ConnectivityState is the connectivity state of the SubConn.
+	ConnectivityState connectivity.State
+	// ConnectionError is set if the ConnectivityState is TransientFailure,
+	// describing the reason the SubConn failed.  Otherwise, it is nil.
+	ConnectionError error
+}
+
+// ClientConnState describes the state of a ClientConn relevant to the
+// balancer.
+type ClientConnState struct {
+	ResolverState resolver.State
+	// The parsed load balancing configuration returned by the builder's
+	// ParseConfig method, if implemented.
+	BalancerConfig serviceconfig.LoadBalancingConfig
+}
+
+// ErrBadResolverState may be returned by UpdateClientConnState to indicate a
+// problem with the provided name resolver data.
+var ErrBadResolverState = errors.New("bad resolver state")
+
+// V2Balancer is defined for documentation purposes.  If a Balancer also
+// implements V2Balancer, its UpdateClientConnState method will be called
+// instead of HandleResolvedAddrs and its UpdateSubConnState will be called
+// instead of HandleSubConnStateChange.
+type V2Balancer interface {
+	// UpdateClientConnState is called by gRPC when the state of the ClientConn
+	// changes.  If the error returned is ErrBadResolverState, the ClientConn
+	// will begin calling ResolveNow on the active name resolver with
+	// exponential backoff until a subsequent call to UpdateClientConnState
+	// returns a nil error.  Any other errors are currently ignored.
+	UpdateClientConnState(ClientConnState) error
+	// ResolverError is called by gRPC when the name resolver reports an error.
+	ResolverError(error)
+	// UpdateSubConnState is called by gRPC when the state of a SubConn
+	// changes.
+	UpdateSubConnState(SubConn, SubConnState)
+	// Close closes the balancer. The balancer is not required to call
+	// ClientConn.RemoveSubConn for its existing SubConns.
+	Close()
+}
+
+// ConnectivityStateEvaluator takes the connectivity states of multiple SubConns
+// and returns one aggregated connectivity state.
+//
+// It's not thread safe.
+type ConnectivityStateEvaluator struct {
+	numReady      uint64 // Number of addrConns in ready state.
+	numConnecting uint64 // Number of addrConns in connecting state.
+}
+
+// RecordTransition records state change happening in subConn and based on that
+// it evaluates what aggregated state should be.
+//
+//  - If at least one SubConn in Ready, the aggregated state is Ready;
+//  - Else if at least one SubConn in Connecting, the aggregated state is Connecting;
+//  - Else the aggregated state is TransientFailure.
+//
+// Idle and Shutdown are not considered.
+func (cse *ConnectivityStateEvaluator) RecordTransition(oldState, newState connectivity.State) connectivity.State {
+	// Update counters.
+	for idx, state := range []connectivity.State{oldState, newState} {
+		updateVal := 2*uint64(idx) - 1 // -1 for oldState and +1 for new.
+		switch state {
+		case connectivity.Ready:
+			cse.numReady += updateVal
+		case connectivity.Connecting:
+			cse.numConnecting += updateVal
+		}
+	}
+
+	// Evaluate.
+	if cse.numReady > 0 {
+		return connectivity.Ready
+	}
+	if cse.numConnecting > 0 {
+		return connectivity.Connecting
+	}
+	return connectivity.TransientFailure
+}
diff --git a/vendor/google.golang.org/grpc/balancer/base/balancer.go b/vendor/google.golang.org/grpc/balancer/base/balancer.go
new file mode 100644
index 0000000..d952f09
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -0,0 +1,249 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package base
+
+import (
+	"context"
+	"errors"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/resolver"
+)
+
+type baseBuilder struct {
+	name            string
+	pickerBuilder   PickerBuilder
+	v2PickerBuilder V2PickerBuilder
+	config          Config
+}
+
+func (bb *baseBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
+	bal := &baseBalancer{
+		cc:              cc,
+		pickerBuilder:   bb.pickerBuilder,
+		v2PickerBuilder: bb.v2PickerBuilder,
+
+		subConns: make(map[resolver.Address]balancer.SubConn),
+		scStates: make(map[balancer.SubConn]connectivity.State),
+		csEvltr:  &balancer.ConnectivityStateEvaluator{},
+		config:   bb.config,
+	}
+	// Initialize picker to a picker that always returns
+	// ErrNoSubConnAvailable, because when state of a SubConn changes, we
+	// may call UpdateState with this picker.
+	if bb.pickerBuilder != nil {
+		bal.picker = NewErrPicker(balancer.ErrNoSubConnAvailable)
+	} else {
+		bal.v2Picker = NewErrPickerV2(balancer.ErrNoSubConnAvailable)
+	}
+	return bal
+}
+
+func (bb *baseBuilder) Name() string {
+	return bb.name
+}
+
+var _ balancer.V2Balancer = (*baseBalancer)(nil) // Assert that we implement V2Balancer
+
+type baseBalancer struct {
+	cc              balancer.ClientConn
+	pickerBuilder   PickerBuilder
+	v2PickerBuilder V2PickerBuilder
+
+	csEvltr *balancer.ConnectivityStateEvaluator
+	state   connectivity.State
+
+	subConns map[resolver.Address]balancer.SubConn
+	scStates map[balancer.SubConn]connectivity.State
+	picker   balancer.Picker
+	v2Picker balancer.V2Picker
+	config   Config
+}
+
+func (b *baseBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
+	panic("not implemented")
+}
+
+func (b *baseBalancer) ResolverError(err error) {
+	switch b.state {
+	case connectivity.TransientFailure, connectivity.Idle, connectivity.Connecting:
+		if b.picker != nil {
+			b.picker = NewErrPicker(err)
+		} else {
+			b.v2Picker = NewErrPickerV2(err)
+		}
+	}
+}
+
+func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
+	// TODO: handle s.ResolverState.Err (log if not nil) once implemented.
+	// TODO: handle s.ResolverState.ServiceConfig?
+	if grpclog.V(2) {
+		grpclog.Infoln("base.baseBalancer: got new ClientConn state: ", s)
+	}
+	// addrsSet is the set converted from addrs, it's used for quick lookup of an address.
+	addrsSet := make(map[resolver.Address]struct{})
+	for _, a := range s.ResolverState.Addresses {
+		addrsSet[a] = struct{}{}
+		if _, ok := b.subConns[a]; !ok {
+			// a is a new address (not existing in b.subConns).
+			sc, err := b.cc.NewSubConn([]resolver.Address{a}, balancer.NewSubConnOptions{HealthCheckEnabled: b.config.HealthCheck})
+			if err != nil {
+				grpclog.Warningf("base.baseBalancer: failed to create new SubConn: %v", err)
+				continue
+			}
+			b.subConns[a] = sc
+			b.scStates[sc] = connectivity.Idle
+			sc.Connect()
+		}
+	}
+	for a, sc := range b.subConns {
+		// a was removed by resolver.
+		if _, ok := addrsSet[a]; !ok {
+			b.cc.RemoveSubConn(sc)
+			delete(b.subConns, a)
+			// Keep the state of this sc in b.scStates until sc's state becomes Shutdown.
+			// The entry will be deleted in HandleSubConnStateChange.
+		}
+	}
+	return nil
+}
+
+// regeneratePicker takes a snapshot of the balancer, and generates a picker
+// from it. The picker is
+//  - errPicker with ErrTransientFailure if the balancer is in TransientFailure,
+//  - built by the pickerBuilder with all READY SubConns otherwise.
+func (b *baseBalancer) regeneratePicker(err error) {
+	if b.state == connectivity.TransientFailure {
+		if b.pickerBuilder != nil {
+			b.picker = NewErrPicker(balancer.ErrTransientFailure)
+		} else {
+			if err != nil {
+				b.v2Picker = NewErrPickerV2(balancer.TransientFailureError(err))
+			} else {
+				// This means the last subchannel transition was not to
+				// TransientFailure (otherwise err must be set), but the
+				// aggregate state of the balancer is TransientFailure, meaning
+				// there are no other addresses.
+				b.v2Picker = NewErrPickerV2(balancer.TransientFailureError(errors.New("resolver returned no addresses")))
+			}
+		}
+		return
+	}
+	if b.pickerBuilder != nil {
+		readySCs := make(map[resolver.Address]balancer.SubConn)
+
+		// Filter out all ready SCs from full subConn map.
+		for addr, sc := range b.subConns {
+			if st, ok := b.scStates[sc]; ok && st == connectivity.Ready {
+				readySCs[addr] = sc
+			}
+		}
+		b.picker = b.pickerBuilder.Build(readySCs)
+	} else {
+		readySCs := make(map[balancer.SubConn]SubConnInfo)
+
+		// Filter out all ready SCs from full subConn map.
+		for addr, sc := range b.subConns {
+			if st, ok := b.scStates[sc]; ok && st == connectivity.Ready {
+				readySCs[sc] = SubConnInfo{Address: addr}
+			}
+		}
+		b.v2Picker = b.v2PickerBuilder.Build(PickerBuildInfo{ReadySCs: readySCs})
+	}
+}
+
+func (b *baseBalancer) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
+	panic("not implemented")
+}
+
+func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+	s := state.ConnectivityState
+	if grpclog.V(2) {
+		grpclog.Infof("base.baseBalancer: handle SubConn state change: %p, %v", sc, s)
+	}
+	oldS, ok := b.scStates[sc]
+	if !ok {
+		if grpclog.V(2) {
+			grpclog.Infof("base.baseBalancer: got state changes for an unknown SubConn: %p, %v", sc, s)
+		}
+		return
+	}
+	b.scStates[sc] = s
+	switch s {
+	case connectivity.Idle:
+		sc.Connect()
+	case connectivity.Shutdown:
+		// When an address was removed by resolver, b called RemoveSubConn but
+		// kept the sc's state in scStates. Remove state for this sc here.
+		delete(b.scStates, sc)
+	}
+
+	oldAggrState := b.state
+	b.state = b.csEvltr.RecordTransition(oldS, s)
+
+	// Regenerate picker when one of the following happens:
+	//  - this sc became ready from not-ready
+	//  - this sc became not-ready from ready
+	//  - the aggregated state of balancer became TransientFailure from non-TransientFailure
+	//  - the aggregated state of balancer became non-TransientFailure from TransientFailure
+	if (s == connectivity.Ready) != (oldS == connectivity.Ready) ||
+		(b.state == connectivity.TransientFailure) != (oldAggrState == connectivity.TransientFailure) {
+		b.regeneratePicker(state.ConnectionError)
+	}
+
+	if b.picker != nil {
+		b.cc.UpdateBalancerState(b.state, b.picker)
+	} else {
+		b.cc.UpdateState(balancer.State{ConnectivityState: b.state, Picker: b.v2Picker})
+	}
+}
+
+// Close is a nop because base balancer doesn't have internal state to clean up,
+// and it doesn't need to call RemoveSubConn for the SubConns.
+func (b *baseBalancer) Close() {
+}
+
+// NewErrPicker returns a picker that always returns err on Pick().
+func NewErrPicker(err error) balancer.Picker {
+	return &errPicker{err: err}
+}
+
+type errPicker struct {
+	err error // Pick() always returns this err.
+}
+
+func (p *errPicker) Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error) {
+	return nil, nil, p.err
+}
+
+// NewErrPickerV2 returns a V2Picker that always returns err on Pick().
+func NewErrPickerV2(err error) balancer.V2Picker {
+	return &errPickerV2{err: err}
+}
+
+type errPickerV2 struct {
+	err error // Pick() always returns this err.
+}
+
+func (p *errPickerV2) Pick(info balancer.PickInfo) (balancer.PickResult, error) {
+	return balancer.PickResult{}, p.err
+}
diff --git a/vendor/google.golang.org/grpc/balancer/base/base.go b/vendor/google.golang.org/grpc/balancer/base/base.go
new file mode 100644
index 0000000..4192918
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/base/base.go
@@ -0,0 +1,93 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package base defines a balancer base that can be used to build balancers with
+// different picking algorithms.
+//
+// The base balancer creates a new SubConn for each resolved address. The
+// provided picker will only be notified about READY SubConns.
+//
+// This package is the base of round_robin balancer, its purpose is to be used
+// to build round_robin like balancers with complex picking algorithms.
+// Balancers with more complicated logic should try to implement a balancer
+// builder from scratch.
+//
+// All APIs in this package are experimental.
+package base
+
+import (
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/resolver"
+)
+
+// PickerBuilder creates balancer.Picker.
+type PickerBuilder interface {
+	// Build takes a slice of ready SubConns, and returns a picker that will be
+	// used by gRPC to pick a SubConn.
+	Build(readySCs map[resolver.Address]balancer.SubConn) balancer.Picker
+}
+
+// V2PickerBuilder creates balancer.V2Picker.
+type V2PickerBuilder interface {
+	// Build returns a picker that will be used by gRPC to pick a SubConn.
+	Build(info PickerBuildInfo) balancer.V2Picker
+}
+
+// PickerBuildInfo contains information needed by the picker builder to
+// construct a picker.
+type PickerBuildInfo struct {
+	// ReadySCs is a map from all ready SubConns to the Addresses used to
+	// create them.
+	ReadySCs map[balancer.SubConn]SubConnInfo
+}
+
+// SubConnInfo contains information about a SubConn created by the base
+// balancer.
+type SubConnInfo struct {
+	Address resolver.Address // the address used to create this SubConn
+}
+
+// NewBalancerBuilder returns a balancer builder. The balancers
+// built by this builder will use the picker builder to build pickers.
+func NewBalancerBuilder(name string, pb PickerBuilder) balancer.Builder {
+	return NewBalancerBuilderWithConfig(name, pb, Config{})
+}
+
+// Config contains the config info about the base balancer builder.
+type Config struct {
+	// HealthCheck indicates whether health checking should be enabled for this specific balancer.
+	HealthCheck bool
+}
+
+// NewBalancerBuilderWithConfig returns a base balancer builder configured by the provided config.
+func NewBalancerBuilderWithConfig(name string, pb PickerBuilder, config Config) balancer.Builder {
+	return &baseBuilder{
+		name:          name,
+		pickerBuilder: pb,
+		config:        config,
+	}
+}
+
+// NewBalancerBuilderV2 returns a base balancer builder configured by the provided config.
+func NewBalancerBuilderV2(name string, pb V2PickerBuilder, config Config) balancer.Builder {
+	return &baseBuilder{
+		name:            name,
+		v2PickerBuilder: pb,
+		config:          config,
+	}
+}
diff --git a/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
new file mode 100644
index 0000000..d4d6455
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
@@ -0,0 +1,81 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package roundrobin defines a roundrobin balancer. Roundrobin balancer is
+// installed as one of the default balancers in gRPC, users don't need to
+// explicitly install this balancer.
+package roundrobin
+
+import (
+	"sync"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/balancer/base"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/grpcrand"
+)
+
+// Name is the name of round_robin balancer.
+const Name = "round_robin"
+
+// newBuilder creates a new roundrobin balancer builder.
+func newBuilder() balancer.Builder {
+	return base.NewBalancerBuilderV2(Name, &rrPickerBuilder{}, base.Config{HealthCheck: true})
+}
+
+func init() {
+	balancer.Register(newBuilder())
+}
+
+type rrPickerBuilder struct{}
+
+func (*rrPickerBuilder) Build(info base.PickerBuildInfo) balancer.V2Picker {
+	grpclog.Infof("roundrobinPicker: newPicker called with info: %v", info)
+	if len(info.ReadySCs) == 0 {
+		return base.NewErrPickerV2(balancer.ErrNoSubConnAvailable)
+	}
+	var scs []balancer.SubConn
+	for sc := range info.ReadySCs {
+		scs = append(scs, sc)
+	}
+	return &rrPicker{
+		subConns: scs,
+		// Start at a random index, as the same RR balancer rebuilds a new
+		// picker when SubConn states change, and we don't want to apply excess
+		// load to the first server in the list.
+		next: grpcrand.Intn(len(scs)),
+	}
+}
+
+type rrPicker struct {
+	// subConns is the snapshot of the roundrobin balancer when this picker was
+	// created. The slice is immutable. Each Get() will do a round robin
+	// selection from it and return the selected SubConn.
+	subConns []balancer.SubConn
+
+	mu   sync.Mutex
+	next int
+}
+
+func (p *rrPicker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
+	p.mu.Lock()
+	sc := p.subConns[p.next]
+	p.next = (p.next + 1) % len(p.subConns)
+	p.mu.Unlock()
+	return balancer.PickResult{SubConn: sc}, nil
+}
diff --git a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
new file mode 100644
index 0000000..824f28e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
@@ -0,0 +1,271 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"fmt"
+	"sync"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/buffer"
+	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/resolver"
+)
+
+// scStateUpdate contains the subConn and the new state it changed to.
+type scStateUpdate struct {
+	sc    balancer.SubConn
+	state connectivity.State
+	err   error
+}
+
+// ccBalancerWrapper is a wrapper on top of cc for balancers.
+// It implements balancer.ClientConn interface.
+type ccBalancerWrapper struct {
+	cc         *ClientConn
+	balancerMu sync.Mutex // synchronizes calls to the balancer
+	balancer   balancer.Balancer
+	scBuffer   *buffer.Unbounded
+	done       *grpcsync.Event
+
+	mu       sync.Mutex
+	subConns map[*acBalancerWrapper]struct{}
+}
+
+func newCCBalancerWrapper(cc *ClientConn, b balancer.Builder, bopts balancer.BuildOptions) *ccBalancerWrapper {
+	ccb := &ccBalancerWrapper{
+		cc:       cc,
+		scBuffer: buffer.NewUnbounded(),
+		done:     grpcsync.NewEvent(),
+		subConns: make(map[*acBalancerWrapper]struct{}),
+	}
+	go ccb.watcher()
+	ccb.balancer = b.Build(ccb, bopts)
+	return ccb
+}
+
+// watcher balancer functions sequentially, so the balancer can be implemented
+// lock-free.
+func (ccb *ccBalancerWrapper) watcher() {
+	for {
+		select {
+		case t := <-ccb.scBuffer.Get():
+			ccb.scBuffer.Load()
+			if ccb.done.HasFired() {
+				break
+			}
+			ccb.balancerMu.Lock()
+			su := t.(*scStateUpdate)
+			if ub, ok := ccb.balancer.(balancer.V2Balancer); ok {
+				ub.UpdateSubConnState(su.sc, balancer.SubConnState{ConnectivityState: su.state, ConnectionError: su.err})
+			} else {
+				ccb.balancer.HandleSubConnStateChange(su.sc, su.state)
+			}
+			ccb.balancerMu.Unlock()
+		case <-ccb.done.Done():
+		}
+
+		if ccb.done.HasFired() {
+			ccb.balancer.Close()
+			ccb.mu.Lock()
+			scs := ccb.subConns
+			ccb.subConns = nil
+			ccb.mu.Unlock()
+			for acbw := range scs {
+				ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
+			}
+			ccb.UpdateState(balancer.State{ConnectivityState: connectivity.Connecting, Picker: nil})
+			return
+		}
+	}
+}
+
+func (ccb *ccBalancerWrapper) close() {
+	ccb.done.Fire()
+}
+
+func (ccb *ccBalancerWrapper) handleSubConnStateChange(sc balancer.SubConn, s connectivity.State, err error) {
+	// When updating addresses for a SubConn, if the address in use is not in
+	// the new addresses, the old ac will be tearDown() and a new ac will be
+	// created. tearDown() generates a state change with Shutdown state, we
+	// don't want the balancer to receive this state change. So before
+	// tearDown() on the old ac, ac.acbw (acWrapper) will be set to nil, and
+	// this function will be called with (nil, Shutdown). We don't need to call
+	// balancer method in this case.
+	if sc == nil {
+		return
+	}
+	ccb.scBuffer.Put(&scStateUpdate{
+		sc:    sc,
+		state: s,
+		err:   err,
+	})
+}
+
+func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnState) error {
+	ccb.balancerMu.Lock()
+	defer ccb.balancerMu.Unlock()
+	if ub, ok := ccb.balancer.(balancer.V2Balancer); ok {
+		return ub.UpdateClientConnState(*ccs)
+	}
+	ccb.balancer.HandleResolvedAddrs(ccs.ResolverState.Addresses, nil)
+	return nil
+}
+
+func (ccb *ccBalancerWrapper) resolverError(err error) {
+	if ub, ok := ccb.balancer.(balancer.V2Balancer); ok {
+		ccb.balancerMu.Lock()
+		ub.ResolverError(err)
+		ccb.balancerMu.Unlock()
+	}
+}
+
+func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (balancer.SubConn, error) {
+	if len(addrs) <= 0 {
+		return nil, fmt.Errorf("grpc: cannot create SubConn with empty address list")
+	}
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	if ccb.subConns == nil {
+		return nil, fmt.Errorf("grpc: ClientConn balancer wrapper was closed")
+	}
+	ac, err := ccb.cc.newAddrConn(addrs, opts)
+	if err != nil {
+		return nil, err
+	}
+	acbw := &acBalancerWrapper{ac: ac}
+	acbw.ac.mu.Lock()
+	ac.acbw = acbw
+	acbw.ac.mu.Unlock()
+	ccb.subConns[acbw] = struct{}{}
+	return acbw, nil
+}
+
+func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
+	acbw, ok := sc.(*acBalancerWrapper)
+	if !ok {
+		return
+	}
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	if ccb.subConns == nil {
+		return
+	}
+	delete(ccb.subConns, acbw)
+	ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
+}
+
+func (ccb *ccBalancerWrapper) UpdateBalancerState(s connectivity.State, p balancer.Picker) {
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	if ccb.subConns == nil {
+		return
+	}
+	// Update picker before updating state.  Even though the ordering here does
+	// not matter, it can lead to multiple calls of Pick in the common start-up
+	// case where we wait for ready and then perform an RPC.  If the picker is
+	// updated later, we could call the "connecting" picker when the state is
+	// updated, and then call the "ready" picker after the picker gets updated.
+	ccb.cc.blockingpicker.updatePicker(p)
+	ccb.cc.csMgr.updateState(s)
+}
+
+func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	if ccb.subConns == nil {
+		return
+	}
+	// Update picker before updating state.  Even though the ordering here does
+	// not matter, it can lead to multiple calls of Pick in the common start-up
+	// case where we wait for ready and then perform an RPC.  If the picker is
+	// updated later, we could call the "connecting" picker when the state is
+	// updated, and then call the "ready" picker after the picker gets updated.
+	ccb.cc.blockingpicker.updatePickerV2(s.Picker)
+	ccb.cc.csMgr.updateState(s.ConnectivityState)
+}
+
+func (ccb *ccBalancerWrapper) ResolveNow(o resolver.ResolveNowOptions) {
+	ccb.cc.resolveNow(o)
+}
+
+func (ccb *ccBalancerWrapper) Target() string {
+	return ccb.cc.target
+}
+
+// acBalancerWrapper is a wrapper on top of ac for balancers.
+// It implements balancer.SubConn interface.
+type acBalancerWrapper struct {
+	mu sync.Mutex
+	ac *addrConn
+}
+
+func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
+	acbw.mu.Lock()
+	defer acbw.mu.Unlock()
+	if len(addrs) <= 0 {
+		acbw.ac.tearDown(errConnDrain)
+		return
+	}
+	if !acbw.ac.tryUpdateAddrs(addrs) {
+		cc := acbw.ac.cc
+		opts := acbw.ac.scopts
+		acbw.ac.mu.Lock()
+		// Set old ac.acbw to nil so the Shutdown state update will be ignored
+		// by balancer.
+		//
+		// TODO(bar) the state transition could be wrong when tearDown() old ac
+		// and creating new ac, fix the transition.
+		acbw.ac.acbw = nil
+		acbw.ac.mu.Unlock()
+		acState := acbw.ac.getState()
+		acbw.ac.tearDown(errConnDrain)
+
+		if acState == connectivity.Shutdown {
+			return
+		}
+
+		ac, err := cc.newAddrConn(addrs, opts)
+		if err != nil {
+			grpclog.Warningf("acBalancerWrapper: UpdateAddresses: failed to newAddrConn: %v", err)
+			return
+		}
+		acbw.ac = ac
+		ac.mu.Lock()
+		ac.acbw = acbw
+		ac.mu.Unlock()
+		if acState != connectivity.Idle {
+			ac.connect()
+		}
+	}
+}
+
+func (acbw *acBalancerWrapper) Connect() {
+	acbw.mu.Lock()
+	defer acbw.mu.Unlock()
+	acbw.ac.connect()
+}
+
+func (acbw *acBalancerWrapper) getAddrConn() *addrConn {
+	acbw.mu.Lock()
+	defer acbw.mu.Unlock()
+	return acbw.ac
+}
diff --git a/vendor/google.golang.org/grpc/balancer_v1_wrapper.go b/vendor/google.golang.org/grpc/balancer_v1_wrapper.go
new file mode 100644
index 0000000..db04b08
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer_v1_wrapper.go
@@ -0,0 +1,334 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"sync"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/resolver"
+)
+
+type balancerWrapperBuilder struct {
+	b Balancer // The v1 balancer.
+}
+
+func (bwb *balancerWrapperBuilder) Build(cc balancer.ClientConn, opts balancer.BuildOptions) balancer.Balancer {
+	bwb.b.Start(opts.Target.Endpoint, BalancerConfig{
+		DialCreds: opts.DialCreds,
+		Dialer:    opts.Dialer,
+	})
+	_, pickfirst := bwb.b.(*pickFirst)
+	bw := &balancerWrapper{
+		balancer:   bwb.b,
+		pickfirst:  pickfirst,
+		cc:         cc,
+		targetAddr: opts.Target.Endpoint,
+		startCh:    make(chan struct{}),
+		conns:      make(map[resolver.Address]balancer.SubConn),
+		connSt:     make(map[balancer.SubConn]*scState),
+		csEvltr:    &balancer.ConnectivityStateEvaluator{},
+		state:      connectivity.Idle,
+	}
+	cc.UpdateState(balancer.State{ConnectivityState: connectivity.Idle, Picker: bw})
+	go bw.lbWatcher()
+	return bw
+}
+
+func (bwb *balancerWrapperBuilder) Name() string {
+	return "wrapper"
+}
+
+type scState struct {
+	addr Address // The v1 address type.
+	s    connectivity.State
+	down func(error)
+}
+
+type balancerWrapper struct {
+	balancer  Balancer // The v1 balancer.
+	pickfirst bool
+
+	cc         balancer.ClientConn
+	targetAddr string // Target without the scheme.
+
+	mu     sync.Mutex
+	conns  map[resolver.Address]balancer.SubConn
+	connSt map[balancer.SubConn]*scState
+	// This channel is closed when handling the first resolver result.
+	// lbWatcher blocks until this is closed, to avoid race between
+	// - NewSubConn is created, cc wants to notify balancer of state changes;
+	// - Build hasn't return, cc doesn't have access to balancer.
+	startCh chan struct{}
+
+	// To aggregate the connectivity state.
+	csEvltr *balancer.ConnectivityStateEvaluator
+	state   connectivity.State
+}
+
+// lbWatcher watches the Notify channel of the balancer and manages
+// connections accordingly.
+func (bw *balancerWrapper) lbWatcher() {
+	<-bw.startCh
+	notifyCh := bw.balancer.Notify()
+	if notifyCh == nil {
+		// There's no resolver in the balancer. Connect directly.
+		a := resolver.Address{
+			Addr: bw.targetAddr,
+			Type: resolver.Backend,
+		}
+		sc, err := bw.cc.NewSubConn([]resolver.Address{a}, balancer.NewSubConnOptions{})
+		if err != nil {
+			grpclog.Warningf("Error creating connection to %v. Err: %v", a, err)
+		} else {
+			bw.mu.Lock()
+			bw.conns[a] = sc
+			bw.connSt[sc] = &scState{
+				addr: Address{Addr: bw.targetAddr},
+				s:    connectivity.Idle,
+			}
+			bw.mu.Unlock()
+			sc.Connect()
+		}
+		return
+	}
+
+	for addrs := range notifyCh {
+		grpclog.Infof("balancerWrapper: got update addr from Notify: %v", addrs)
+		if bw.pickfirst {
+			var (
+				oldA  resolver.Address
+				oldSC balancer.SubConn
+			)
+			bw.mu.Lock()
+			for oldA, oldSC = range bw.conns {
+				break
+			}
+			bw.mu.Unlock()
+			if len(addrs) <= 0 {
+				if oldSC != nil {
+					// Teardown old sc.
+					bw.mu.Lock()
+					delete(bw.conns, oldA)
+					delete(bw.connSt, oldSC)
+					bw.mu.Unlock()
+					bw.cc.RemoveSubConn(oldSC)
+				}
+				continue
+			}
+
+			var newAddrs []resolver.Address
+			for _, a := range addrs {
+				newAddr := resolver.Address{
+					Addr:       a.Addr,
+					Type:       resolver.Backend, // All addresses from balancer are all backends.
+					ServerName: "",
+					Metadata:   a.Metadata,
+				}
+				newAddrs = append(newAddrs, newAddr)
+			}
+			if oldSC == nil {
+				// Create new sc.
+				sc, err := bw.cc.NewSubConn(newAddrs, balancer.NewSubConnOptions{})
+				if err != nil {
+					grpclog.Warningf("Error creating connection to %v. Err: %v", newAddrs, err)
+				} else {
+					bw.mu.Lock()
+					// For pickfirst, there should be only one SubConn, so the
+					// address doesn't matter. All states updating (up and down)
+					// and picking should all happen on that only SubConn.
+					bw.conns[resolver.Address{}] = sc
+					bw.connSt[sc] = &scState{
+						addr: addrs[0], // Use the first address.
+						s:    connectivity.Idle,
+					}
+					bw.mu.Unlock()
+					sc.Connect()
+				}
+			} else {
+				bw.mu.Lock()
+				bw.connSt[oldSC].addr = addrs[0]
+				bw.mu.Unlock()
+				oldSC.UpdateAddresses(newAddrs)
+			}
+		} else {
+			var (
+				add []resolver.Address // Addresses need to setup connections.
+				del []balancer.SubConn // Connections need to tear down.
+			)
+			resAddrs := make(map[resolver.Address]Address)
+			for _, a := range addrs {
+				resAddrs[resolver.Address{
+					Addr:       a.Addr,
+					Type:       resolver.Backend, // All addresses from balancer are all backends.
+					ServerName: "",
+					Metadata:   a.Metadata,
+				}] = a
+			}
+			bw.mu.Lock()
+			for a := range resAddrs {
+				if _, ok := bw.conns[a]; !ok {
+					add = append(add, a)
+				}
+			}
+			for a, c := range bw.conns {
+				if _, ok := resAddrs[a]; !ok {
+					del = append(del, c)
+					delete(bw.conns, a)
+					// Keep the state of this sc in bw.connSt until its state becomes Shutdown.
+				}
+			}
+			bw.mu.Unlock()
+			for _, a := range add {
+				sc, err := bw.cc.NewSubConn([]resolver.Address{a}, balancer.NewSubConnOptions{})
+				if err != nil {
+					grpclog.Warningf("Error creating connection to %v. Err: %v", a, err)
+				} else {
+					bw.mu.Lock()
+					bw.conns[a] = sc
+					bw.connSt[sc] = &scState{
+						addr: resAddrs[a],
+						s:    connectivity.Idle,
+					}
+					bw.mu.Unlock()
+					sc.Connect()
+				}
+			}
+			for _, c := range del {
+				bw.cc.RemoveSubConn(c)
+			}
+		}
+	}
+}
+
+func (bw *balancerWrapper) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	scSt, ok := bw.connSt[sc]
+	if !ok {
+		return
+	}
+	if s == connectivity.Idle {
+		sc.Connect()
+	}
+	oldS := scSt.s
+	scSt.s = s
+	if oldS != connectivity.Ready && s == connectivity.Ready {
+		scSt.down = bw.balancer.Up(scSt.addr)
+	} else if oldS == connectivity.Ready && s != connectivity.Ready {
+		if scSt.down != nil {
+			scSt.down(errConnClosing)
+		}
+	}
+	sa := bw.csEvltr.RecordTransition(oldS, s)
+	if bw.state != sa {
+		bw.state = sa
+	}
+	bw.cc.UpdateState(balancer.State{ConnectivityState: bw.state, Picker: bw})
+	if s == connectivity.Shutdown {
+		// Remove state for this sc.
+		delete(bw.connSt, sc)
+	}
+}
+
+func (bw *balancerWrapper) HandleResolvedAddrs([]resolver.Address, error) {
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	select {
+	case <-bw.startCh:
+	default:
+		close(bw.startCh)
+	}
+	// There should be a resolver inside the balancer.
+	// All updates here, if any, are ignored.
+}
+
+func (bw *balancerWrapper) Close() {
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	select {
+	case <-bw.startCh:
+	default:
+		close(bw.startCh)
+	}
+	bw.balancer.Close()
+}
+
+// The picker is the balancerWrapper itself.
+// It either blocks or returns error, consistent with v1 balancer Get().
+func (bw *balancerWrapper) Pick(info balancer.PickInfo) (result balancer.PickResult, err error) {
+	failfast := true // Default failfast is true.
+	if ss, ok := rpcInfoFromContext(info.Ctx); ok {
+		failfast = ss.failfast
+	}
+	a, p, err := bw.balancer.Get(info.Ctx, BalancerGetOptions{BlockingWait: !failfast})
+	if err != nil {
+		return balancer.PickResult{}, toRPCErr(err)
+	}
+	if p != nil {
+		result.Done = func(balancer.DoneInfo) { p() }
+		defer func() {
+			if err != nil {
+				p()
+			}
+		}()
+	}
+
+	bw.mu.Lock()
+	defer bw.mu.Unlock()
+	if bw.pickfirst {
+		// Get the first sc in conns.
+		for _, result.SubConn = range bw.conns {
+			return result, nil
+		}
+		return balancer.PickResult{}, balancer.ErrNoSubConnAvailable
+	}
+	var ok1 bool
+	result.SubConn, ok1 = bw.conns[resolver.Address{
+		Addr:       a.Addr,
+		Type:       resolver.Backend,
+		ServerName: "",
+		Metadata:   a.Metadata,
+	}]
+	s, ok2 := bw.connSt[result.SubConn]
+	if !ok1 || !ok2 {
+		// This can only happen due to a race where Get() returned an address
+		// that was subsequently removed by Notify.  In this case we should
+		// retry always.
+		return balancer.PickResult{}, balancer.ErrNoSubConnAvailable
+	}
+	switch s.s {
+	case connectivity.Ready, connectivity.Idle:
+		return result, nil
+	case connectivity.Shutdown, connectivity.TransientFailure:
+		// If the returned sc has been shut down or is in transient failure,
+		// return error, and this RPC will fail or wait for another picker (if
+		// non-failfast).
+		return balancer.PickResult{}, balancer.ErrTransientFailure
+	default:
+		// For other states (connecting or unknown), the v1 balancer would
+		// traditionally wait until ready and then issue the RPC.  Returning
+		// ErrNoSubConnAvailable will be a slight improvement in that it will
+		// allow the balancer to choose another address in case others are
+		// connected.
+		return balancer.PickResult{}, balancer.ErrNoSubConnAvailable
+	}
+}
diff --git a/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
new file mode 100644
index 0000000..f393bb6
--- /dev/null
+++ b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
@@ -0,0 +1,900 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: grpc/binarylog/grpc_binarylog_v1/binarylog.proto
+
+package grpc_binarylog_v1 // import "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+import duration "github.com/golang/protobuf/ptypes/duration"
+import timestamp "github.com/golang/protobuf/ptypes/timestamp"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+// Enumerates the type of event
+// Note the terminology is different from the RPC semantics
+// definition, but the same meaning is expressed here.
+type GrpcLogEntry_EventType int32
+
+const (
+	GrpcLogEntry_EVENT_TYPE_UNKNOWN GrpcLogEntry_EventType = 0
+	// Header sent from client to server
+	GrpcLogEntry_EVENT_TYPE_CLIENT_HEADER GrpcLogEntry_EventType = 1
+	// Header sent from server to client
+	GrpcLogEntry_EVENT_TYPE_SERVER_HEADER GrpcLogEntry_EventType = 2
+	// Message sent from client to server
+	GrpcLogEntry_EVENT_TYPE_CLIENT_MESSAGE GrpcLogEntry_EventType = 3
+	// Message sent from server to client
+	GrpcLogEntry_EVENT_TYPE_SERVER_MESSAGE GrpcLogEntry_EventType = 4
+	// A signal that client is done sending
+	GrpcLogEntry_EVENT_TYPE_CLIENT_HALF_CLOSE GrpcLogEntry_EventType = 5
+	// Trailer indicates the end of the RPC.
+	// On client side, this event means a trailer was either received
+	// from the network or the gRPC library locally generated a status
+	// to inform the application about a failure.
+	// On server side, this event means the server application requested
+	// to send a trailer. Note: EVENT_TYPE_CANCEL may still arrive after
+	// this due to races on server side.
+	GrpcLogEntry_EVENT_TYPE_SERVER_TRAILER GrpcLogEntry_EventType = 6
+	// A signal that the RPC is cancelled. On client side, this
+	// indicates the client application requests a cancellation.
+	// On server side, this indicates that cancellation was detected.
+	// Note: This marks the end of the RPC. Events may arrive after
+	// this due to races. For example, on client side a trailer
+	// may arrive even though the application requested to cancel the RPC.
+	GrpcLogEntry_EVENT_TYPE_CANCEL GrpcLogEntry_EventType = 7
+)
+
+var GrpcLogEntry_EventType_name = map[int32]string{
+	0: "EVENT_TYPE_UNKNOWN",
+	1: "EVENT_TYPE_CLIENT_HEADER",
+	2: "EVENT_TYPE_SERVER_HEADER",
+	3: "EVENT_TYPE_CLIENT_MESSAGE",
+	4: "EVENT_TYPE_SERVER_MESSAGE",
+	5: "EVENT_TYPE_CLIENT_HALF_CLOSE",
+	6: "EVENT_TYPE_SERVER_TRAILER",
+	7: "EVENT_TYPE_CANCEL",
+}
+var GrpcLogEntry_EventType_value = map[string]int32{
+	"EVENT_TYPE_UNKNOWN":           0,
+	"EVENT_TYPE_CLIENT_HEADER":     1,
+	"EVENT_TYPE_SERVER_HEADER":     2,
+	"EVENT_TYPE_CLIENT_MESSAGE":    3,
+	"EVENT_TYPE_SERVER_MESSAGE":    4,
+	"EVENT_TYPE_CLIENT_HALF_CLOSE": 5,
+	"EVENT_TYPE_SERVER_TRAILER":    6,
+	"EVENT_TYPE_CANCEL":            7,
+}
+
+func (x GrpcLogEntry_EventType) String() string {
+	return proto.EnumName(GrpcLogEntry_EventType_name, int32(x))
+}
+func (GrpcLogEntry_EventType) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{0, 0}
+}
+
+// Enumerates the entity that generates the log entry
+type GrpcLogEntry_Logger int32
+
+const (
+	GrpcLogEntry_LOGGER_UNKNOWN GrpcLogEntry_Logger = 0
+	GrpcLogEntry_LOGGER_CLIENT  GrpcLogEntry_Logger = 1
+	GrpcLogEntry_LOGGER_SERVER  GrpcLogEntry_Logger = 2
+)
+
+var GrpcLogEntry_Logger_name = map[int32]string{
+	0: "LOGGER_UNKNOWN",
+	1: "LOGGER_CLIENT",
+	2: "LOGGER_SERVER",
+}
+var GrpcLogEntry_Logger_value = map[string]int32{
+	"LOGGER_UNKNOWN": 0,
+	"LOGGER_CLIENT":  1,
+	"LOGGER_SERVER":  2,
+}
+
+func (x GrpcLogEntry_Logger) String() string {
+	return proto.EnumName(GrpcLogEntry_Logger_name, int32(x))
+}
+func (GrpcLogEntry_Logger) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{0, 1}
+}
+
+type Address_Type int32
+
+const (
+	Address_TYPE_UNKNOWN Address_Type = 0
+	// address is in 1.2.3.4 form
+	Address_TYPE_IPV4 Address_Type = 1
+	// address is in IPv6 canonical form (RFC5952 section 4)
+	// The scope is NOT included in the address string.
+	Address_TYPE_IPV6 Address_Type = 2
+	// address is UDS string
+	Address_TYPE_UNIX Address_Type = 3
+)
+
+var Address_Type_name = map[int32]string{
+	0: "TYPE_UNKNOWN",
+	1: "TYPE_IPV4",
+	2: "TYPE_IPV6",
+	3: "TYPE_UNIX",
+}
+var Address_Type_value = map[string]int32{
+	"TYPE_UNKNOWN": 0,
+	"TYPE_IPV4":    1,
+	"TYPE_IPV6":    2,
+	"TYPE_UNIX":    3,
+}
+
+func (x Address_Type) String() string {
+	return proto.EnumName(Address_Type_name, int32(x))
+}
+func (Address_Type) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{7, 0}
+}
+
+// Log entry we store in binary logs
+type GrpcLogEntry struct {
+	// The timestamp of the binary log message
+	Timestamp *timestamp.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	// Uniquely identifies a call. The value must not be 0 in order to disambiguate
+	// from an unset value.
+	// Each call may have several log entries, they will all have the same call_id.
+	// Nothing is guaranteed about their value other than they are unique across
+	// different RPCs in the same gRPC process.
+	CallId uint64 `protobuf:"varint,2,opt,name=call_id,json=callId,proto3" json:"call_id,omitempty"`
+	// The entry sequence id for this call. The first GrpcLogEntry has a
+	// value of 1, to disambiguate from an unset value. The purpose of
+	// this field is to detect missing entries in environments where
+	// durability or ordering is not guaranteed.
+	SequenceIdWithinCall uint64                 `protobuf:"varint,3,opt,name=sequence_id_within_call,json=sequenceIdWithinCall,proto3" json:"sequence_id_within_call,omitempty"`
+	Type                 GrpcLogEntry_EventType `protobuf:"varint,4,opt,name=type,proto3,enum=grpc.binarylog.v1.GrpcLogEntry_EventType" json:"type,omitempty"`
+	Logger               GrpcLogEntry_Logger    `protobuf:"varint,5,opt,name=logger,proto3,enum=grpc.binarylog.v1.GrpcLogEntry_Logger" json:"logger,omitempty"`
+	// The logger uses one of the following fields to record the payload,
+	// according to the type of the log entry.
+	//
+	// Types that are valid to be assigned to Payload:
+	//	*GrpcLogEntry_ClientHeader
+	//	*GrpcLogEntry_ServerHeader
+	//	*GrpcLogEntry_Message
+	//	*GrpcLogEntry_Trailer
+	Payload isGrpcLogEntry_Payload `protobuf_oneof:"payload"`
+	// true if payload does not represent the full message or metadata.
+	PayloadTruncated bool `protobuf:"varint,10,opt,name=payload_truncated,json=payloadTruncated,proto3" json:"payload_truncated,omitempty"`
+	// Peer address information, will only be recorded on the first
+	// incoming event. On client side, peer is logged on
+	// EVENT_TYPE_SERVER_HEADER normally or EVENT_TYPE_SERVER_TRAILER in
+	// the case of trailers-only. On server side, peer is always
+	// logged on EVENT_TYPE_CLIENT_HEADER.
+	Peer                 *Address `protobuf:"bytes,11,opt,name=peer,proto3" json:"peer,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *GrpcLogEntry) Reset()         { *m = GrpcLogEntry{} }
+func (m *GrpcLogEntry) String() string { return proto.CompactTextString(m) }
+func (*GrpcLogEntry) ProtoMessage()    {}
+func (*GrpcLogEntry) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{0}
+}
+func (m *GrpcLogEntry) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GrpcLogEntry.Unmarshal(m, b)
+}
+func (m *GrpcLogEntry) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GrpcLogEntry.Marshal(b, m, deterministic)
+}
+func (dst *GrpcLogEntry) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GrpcLogEntry.Merge(dst, src)
+}
+func (m *GrpcLogEntry) XXX_Size() int {
+	return xxx_messageInfo_GrpcLogEntry.Size(m)
+}
+func (m *GrpcLogEntry) XXX_DiscardUnknown() {
+	xxx_messageInfo_GrpcLogEntry.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GrpcLogEntry proto.InternalMessageInfo
+
+func (m *GrpcLogEntry) GetTimestamp() *timestamp.Timestamp {
+	if m != nil {
+		return m.Timestamp
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetCallId() uint64 {
+	if m != nil {
+		return m.CallId
+	}
+	return 0
+}
+
+func (m *GrpcLogEntry) GetSequenceIdWithinCall() uint64 {
+	if m != nil {
+		return m.SequenceIdWithinCall
+	}
+	return 0
+}
+
+func (m *GrpcLogEntry) GetType() GrpcLogEntry_EventType {
+	if m != nil {
+		return m.Type
+	}
+	return GrpcLogEntry_EVENT_TYPE_UNKNOWN
+}
+
+func (m *GrpcLogEntry) GetLogger() GrpcLogEntry_Logger {
+	if m != nil {
+		return m.Logger
+	}
+	return GrpcLogEntry_LOGGER_UNKNOWN
+}
+
+type isGrpcLogEntry_Payload interface {
+	isGrpcLogEntry_Payload()
+}
+
+type GrpcLogEntry_ClientHeader struct {
+	ClientHeader *ClientHeader `protobuf:"bytes,6,opt,name=client_header,json=clientHeader,proto3,oneof"`
+}
+
+type GrpcLogEntry_ServerHeader struct {
+	ServerHeader *ServerHeader `protobuf:"bytes,7,opt,name=server_header,json=serverHeader,proto3,oneof"`
+}
+
+type GrpcLogEntry_Message struct {
+	Message *Message `protobuf:"bytes,8,opt,name=message,proto3,oneof"`
+}
+
+type GrpcLogEntry_Trailer struct {
+	Trailer *Trailer `protobuf:"bytes,9,opt,name=trailer,proto3,oneof"`
+}
+
+func (*GrpcLogEntry_ClientHeader) isGrpcLogEntry_Payload() {}
+
+func (*GrpcLogEntry_ServerHeader) isGrpcLogEntry_Payload() {}
+
+func (*GrpcLogEntry_Message) isGrpcLogEntry_Payload() {}
+
+func (*GrpcLogEntry_Trailer) isGrpcLogEntry_Payload() {}
+
+func (m *GrpcLogEntry) GetPayload() isGrpcLogEntry_Payload {
+	if m != nil {
+		return m.Payload
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetClientHeader() *ClientHeader {
+	if x, ok := m.GetPayload().(*GrpcLogEntry_ClientHeader); ok {
+		return x.ClientHeader
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetServerHeader() *ServerHeader {
+	if x, ok := m.GetPayload().(*GrpcLogEntry_ServerHeader); ok {
+		return x.ServerHeader
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetMessage() *Message {
+	if x, ok := m.GetPayload().(*GrpcLogEntry_Message); ok {
+		return x.Message
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetTrailer() *Trailer {
+	if x, ok := m.GetPayload().(*GrpcLogEntry_Trailer); ok {
+		return x.Trailer
+	}
+	return nil
+}
+
+func (m *GrpcLogEntry) GetPayloadTruncated() bool {
+	if m != nil {
+		return m.PayloadTruncated
+	}
+	return false
+}
+
+func (m *GrpcLogEntry) GetPeer() *Address {
+	if m != nil {
+		return m.Peer
+	}
+	return nil
+}
+
+// XXX_OneofFuncs is for the internal use of the proto package.
+func (*GrpcLogEntry) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
+	return _GrpcLogEntry_OneofMarshaler, _GrpcLogEntry_OneofUnmarshaler, _GrpcLogEntry_OneofSizer, []interface{}{
+		(*GrpcLogEntry_ClientHeader)(nil),
+		(*GrpcLogEntry_ServerHeader)(nil),
+		(*GrpcLogEntry_Message)(nil),
+		(*GrpcLogEntry_Trailer)(nil),
+	}
+}
+
+func _GrpcLogEntry_OneofMarshaler(msg proto.Message, b *proto.Buffer) error {
+	m := msg.(*GrpcLogEntry)
+	// payload
+	switch x := m.Payload.(type) {
+	case *GrpcLogEntry_ClientHeader:
+		b.EncodeVarint(6<<3 | proto.WireBytes)
+		if err := b.EncodeMessage(x.ClientHeader); err != nil {
+			return err
+		}
+	case *GrpcLogEntry_ServerHeader:
+		b.EncodeVarint(7<<3 | proto.WireBytes)
+		if err := b.EncodeMessage(x.ServerHeader); err != nil {
+			return err
+		}
+	case *GrpcLogEntry_Message:
+		b.EncodeVarint(8<<3 | proto.WireBytes)
+		if err := b.EncodeMessage(x.Message); err != nil {
+			return err
+		}
+	case *GrpcLogEntry_Trailer:
+		b.EncodeVarint(9<<3 | proto.WireBytes)
+		if err := b.EncodeMessage(x.Trailer); err != nil {
+			return err
+		}
+	case nil:
+	default:
+		return fmt.Errorf("GrpcLogEntry.Payload has unexpected type %T", x)
+	}
+	return nil
+}
+
+func _GrpcLogEntry_OneofUnmarshaler(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error) {
+	m := msg.(*GrpcLogEntry)
+	switch tag {
+	case 6: // payload.client_header
+		if wire != proto.WireBytes {
+			return true, proto.ErrInternalBadWireType
+		}
+		msg := new(ClientHeader)
+		err := b.DecodeMessage(msg)
+		m.Payload = &GrpcLogEntry_ClientHeader{msg}
+		return true, err
+	case 7: // payload.server_header
+		if wire != proto.WireBytes {
+			return true, proto.ErrInternalBadWireType
+		}
+		msg := new(ServerHeader)
+		err := b.DecodeMessage(msg)
+		m.Payload = &GrpcLogEntry_ServerHeader{msg}
+		return true, err
+	case 8: // payload.message
+		if wire != proto.WireBytes {
+			return true, proto.ErrInternalBadWireType
+		}
+		msg := new(Message)
+		err := b.DecodeMessage(msg)
+		m.Payload = &GrpcLogEntry_Message{msg}
+		return true, err
+	case 9: // payload.trailer
+		if wire != proto.WireBytes {
+			return true, proto.ErrInternalBadWireType
+		}
+		msg := new(Trailer)
+		err := b.DecodeMessage(msg)
+		m.Payload = &GrpcLogEntry_Trailer{msg}
+		return true, err
+	default:
+		return false, nil
+	}
+}
+
+func _GrpcLogEntry_OneofSizer(msg proto.Message) (n int) {
+	m := msg.(*GrpcLogEntry)
+	// payload
+	switch x := m.Payload.(type) {
+	case *GrpcLogEntry_ClientHeader:
+		s := proto.Size(x.ClientHeader)
+		n += 1 // tag and wire
+		n += proto.SizeVarint(uint64(s))
+		n += s
+	case *GrpcLogEntry_ServerHeader:
+		s := proto.Size(x.ServerHeader)
+		n += 1 // tag and wire
+		n += proto.SizeVarint(uint64(s))
+		n += s
+	case *GrpcLogEntry_Message:
+		s := proto.Size(x.Message)
+		n += 1 // tag and wire
+		n += proto.SizeVarint(uint64(s))
+		n += s
+	case *GrpcLogEntry_Trailer:
+		s := proto.Size(x.Trailer)
+		n += 1 // tag and wire
+		n += proto.SizeVarint(uint64(s))
+		n += s
+	case nil:
+	default:
+		panic(fmt.Sprintf("proto: unexpected type %T in oneof", x))
+	}
+	return n
+}
+
+type ClientHeader struct {
+	// This contains only the metadata from the application.
+	Metadata *Metadata `protobuf:"bytes,1,opt,name=metadata,proto3" json:"metadata,omitempty"`
+	// The name of the RPC method, which looks something like:
+	// /<service>/<method>
+	// Note the leading "/" character.
+	MethodName string `protobuf:"bytes,2,opt,name=method_name,json=methodName,proto3" json:"method_name,omitempty"`
+	// A single process may be used to run multiple virtual
+	// servers with different identities.
+	// The authority is the name of such a server identitiy.
+	// It is typically a portion of the URI in the form of
+	// <host> or <host>:<port> .
+	Authority string `protobuf:"bytes,3,opt,name=authority,proto3" json:"authority,omitempty"`
+	// the RPC timeout
+	Timeout              *duration.Duration `protobuf:"bytes,4,opt,name=timeout,proto3" json:"timeout,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
+}
+
+func (m *ClientHeader) Reset()         { *m = ClientHeader{} }
+func (m *ClientHeader) String() string { return proto.CompactTextString(m) }
+func (*ClientHeader) ProtoMessage()    {}
+func (*ClientHeader) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{1}
+}
+func (m *ClientHeader) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ClientHeader.Unmarshal(m, b)
+}
+func (m *ClientHeader) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ClientHeader.Marshal(b, m, deterministic)
+}
+func (dst *ClientHeader) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ClientHeader.Merge(dst, src)
+}
+func (m *ClientHeader) XXX_Size() int {
+	return xxx_messageInfo_ClientHeader.Size(m)
+}
+func (m *ClientHeader) XXX_DiscardUnknown() {
+	xxx_messageInfo_ClientHeader.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ClientHeader proto.InternalMessageInfo
+
+func (m *ClientHeader) GetMetadata() *Metadata {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
+func (m *ClientHeader) GetMethodName() string {
+	if m != nil {
+		return m.MethodName
+	}
+	return ""
+}
+
+func (m *ClientHeader) GetAuthority() string {
+	if m != nil {
+		return m.Authority
+	}
+	return ""
+}
+
+func (m *ClientHeader) GetTimeout() *duration.Duration {
+	if m != nil {
+		return m.Timeout
+	}
+	return nil
+}
+
+type ServerHeader struct {
+	// This contains only the metadata from the application.
+	Metadata             *Metadata `protobuf:"bytes,1,opt,name=metadata,proto3" json:"metadata,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
+}
+
+func (m *ServerHeader) Reset()         { *m = ServerHeader{} }
+func (m *ServerHeader) String() string { return proto.CompactTextString(m) }
+func (*ServerHeader) ProtoMessage()    {}
+func (*ServerHeader) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{2}
+}
+func (m *ServerHeader) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServerHeader.Unmarshal(m, b)
+}
+func (m *ServerHeader) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServerHeader.Marshal(b, m, deterministic)
+}
+func (dst *ServerHeader) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServerHeader.Merge(dst, src)
+}
+func (m *ServerHeader) XXX_Size() int {
+	return xxx_messageInfo_ServerHeader.Size(m)
+}
+func (m *ServerHeader) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServerHeader.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServerHeader proto.InternalMessageInfo
+
+func (m *ServerHeader) GetMetadata() *Metadata {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
+type Trailer struct {
+	// This contains only the metadata from the application.
+	Metadata *Metadata `protobuf:"bytes,1,opt,name=metadata,proto3" json:"metadata,omitempty"`
+	// The gRPC status code.
+	StatusCode uint32 `protobuf:"varint,2,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	// An original status message before any transport specific
+	// encoding.
+	StatusMessage string `protobuf:"bytes,3,opt,name=status_message,json=statusMessage,proto3" json:"status_message,omitempty"`
+	// The value of the 'grpc-status-details-bin' metadata key. If
+	// present, this is always an encoded 'google.rpc.Status' message.
+	StatusDetails        []byte   `protobuf:"bytes,4,opt,name=status_details,json=statusDetails,proto3" json:"status_details,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Trailer) Reset()         { *m = Trailer{} }
+func (m *Trailer) String() string { return proto.CompactTextString(m) }
+func (*Trailer) ProtoMessage()    {}
+func (*Trailer) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{3}
+}
+func (m *Trailer) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Trailer.Unmarshal(m, b)
+}
+func (m *Trailer) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Trailer.Marshal(b, m, deterministic)
+}
+func (dst *Trailer) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Trailer.Merge(dst, src)
+}
+func (m *Trailer) XXX_Size() int {
+	return xxx_messageInfo_Trailer.Size(m)
+}
+func (m *Trailer) XXX_DiscardUnknown() {
+	xxx_messageInfo_Trailer.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Trailer proto.InternalMessageInfo
+
+func (m *Trailer) GetMetadata() *Metadata {
+	if m != nil {
+		return m.Metadata
+	}
+	return nil
+}
+
+func (m *Trailer) GetStatusCode() uint32 {
+	if m != nil {
+		return m.StatusCode
+	}
+	return 0
+}
+
+func (m *Trailer) GetStatusMessage() string {
+	if m != nil {
+		return m.StatusMessage
+	}
+	return ""
+}
+
+func (m *Trailer) GetStatusDetails() []byte {
+	if m != nil {
+		return m.StatusDetails
+	}
+	return nil
+}
+
+// Message payload, used by CLIENT_MESSAGE and SERVER_MESSAGE
+type Message struct {
+	// Length of the message. It may not be the same as the length of the
+	// data field, as the logging payload can be truncated or omitted.
+	Length uint32 `protobuf:"varint,1,opt,name=length,proto3" json:"length,omitempty"`
+	// May be truncated or omitted.
+	Data                 []byte   `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Message) Reset()         { *m = Message{} }
+func (m *Message) String() string { return proto.CompactTextString(m) }
+func (*Message) ProtoMessage()    {}
+func (*Message) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{4}
+}
+func (m *Message) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Message.Unmarshal(m, b)
+}
+func (m *Message) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Message.Marshal(b, m, deterministic)
+}
+func (dst *Message) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Message.Merge(dst, src)
+}
+func (m *Message) XXX_Size() int {
+	return xxx_messageInfo_Message.Size(m)
+}
+func (m *Message) XXX_DiscardUnknown() {
+	xxx_messageInfo_Message.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Message proto.InternalMessageInfo
+
+func (m *Message) GetLength() uint32 {
+	if m != nil {
+		return m.Length
+	}
+	return 0
+}
+
+func (m *Message) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
+// A list of metadata pairs, used in the payload of client header,
+// server header, and server trailer.
+// Implementations may omit some entries to honor the header limits
+// of GRPC_BINARY_LOG_CONFIG.
+//
+// Header keys added by gRPC are omitted. To be more specific,
+// implementations will not log the following entries, and this is
+// not to be treated as a truncation:
+// - entries handled by grpc that are not user visible, such as those
+//   that begin with 'grpc-' (with exception of grpc-trace-bin)
+//   or keys like 'lb-token'
+// - transport specific entries, including but not limited to:
+//   ':path', ':authority', 'content-encoding', 'user-agent', 'te', etc
+// - entries added for call credentials
+//
+// Implementations must always log grpc-trace-bin if it is present.
+// Practically speaking it will only be visible on server side because
+// grpc-trace-bin is managed by low level client side mechanisms
+// inaccessible from the application level. On server side, the
+// header is just a normal metadata key.
+// The pair will not count towards the size limit.
+type Metadata struct {
+	Entry                []*MetadataEntry `protobuf:"bytes,1,rep,name=entry,proto3" json:"entry,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
+	XXX_unrecognized     []byte           `json:"-"`
+	XXX_sizecache        int32            `json:"-"`
+}
+
+func (m *Metadata) Reset()         { *m = Metadata{} }
+func (m *Metadata) String() string { return proto.CompactTextString(m) }
+func (*Metadata) ProtoMessage()    {}
+func (*Metadata) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{5}
+}
+func (m *Metadata) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Metadata.Unmarshal(m, b)
+}
+func (m *Metadata) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Metadata.Marshal(b, m, deterministic)
+}
+func (dst *Metadata) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Metadata.Merge(dst, src)
+}
+func (m *Metadata) XXX_Size() int {
+	return xxx_messageInfo_Metadata.Size(m)
+}
+func (m *Metadata) XXX_DiscardUnknown() {
+	xxx_messageInfo_Metadata.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Metadata proto.InternalMessageInfo
+
+func (m *Metadata) GetEntry() []*MetadataEntry {
+	if m != nil {
+		return m.Entry
+	}
+	return nil
+}
+
+// A metadata key value pair
+type MetadataEntry struct {
+	Key                  string   `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Value                []byte   `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *MetadataEntry) Reset()         { *m = MetadataEntry{} }
+func (m *MetadataEntry) String() string { return proto.CompactTextString(m) }
+func (*MetadataEntry) ProtoMessage()    {}
+func (*MetadataEntry) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{6}
+}
+func (m *MetadataEntry) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_MetadataEntry.Unmarshal(m, b)
+}
+func (m *MetadataEntry) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_MetadataEntry.Marshal(b, m, deterministic)
+}
+func (dst *MetadataEntry) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_MetadataEntry.Merge(dst, src)
+}
+func (m *MetadataEntry) XXX_Size() int {
+	return xxx_messageInfo_MetadataEntry.Size(m)
+}
+func (m *MetadataEntry) XXX_DiscardUnknown() {
+	xxx_messageInfo_MetadataEntry.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_MetadataEntry proto.InternalMessageInfo
+
+func (m *MetadataEntry) GetKey() string {
+	if m != nil {
+		return m.Key
+	}
+	return ""
+}
+
+func (m *MetadataEntry) GetValue() []byte {
+	if m != nil {
+		return m.Value
+	}
+	return nil
+}
+
+// Address information
+type Address struct {
+	Type    Address_Type `protobuf:"varint,1,opt,name=type,proto3,enum=grpc.binarylog.v1.Address_Type" json:"type,omitempty"`
+	Address string       `protobuf:"bytes,2,opt,name=address,proto3" json:"address,omitempty"`
+	// only for TYPE_IPV4 and TYPE_IPV6
+	IpPort               uint32   `protobuf:"varint,3,opt,name=ip_port,json=ipPort,proto3" json:"ip_port,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *Address) Reset()         { *m = Address{} }
+func (m *Address) String() string { return proto.CompactTextString(m) }
+func (*Address) ProtoMessage()    {}
+func (*Address) Descriptor() ([]byte, []int) {
+	return fileDescriptor_binarylog_264c8c9c551ce911, []int{7}
+}
+func (m *Address) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Address.Unmarshal(m, b)
+}
+func (m *Address) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Address.Marshal(b, m, deterministic)
+}
+func (dst *Address) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Address.Merge(dst, src)
+}
+func (m *Address) XXX_Size() int {
+	return xxx_messageInfo_Address.Size(m)
+}
+func (m *Address) XXX_DiscardUnknown() {
+	xxx_messageInfo_Address.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Address proto.InternalMessageInfo
+
+func (m *Address) GetType() Address_Type {
+	if m != nil {
+		return m.Type
+	}
+	return Address_TYPE_UNKNOWN
+}
+
+func (m *Address) GetAddress() string {
+	if m != nil {
+		return m.Address
+	}
+	return ""
+}
+
+func (m *Address) GetIpPort() uint32 {
+	if m != nil {
+		return m.IpPort
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*GrpcLogEntry)(nil), "grpc.binarylog.v1.GrpcLogEntry")
+	proto.RegisterType((*ClientHeader)(nil), "grpc.binarylog.v1.ClientHeader")
+	proto.RegisterType((*ServerHeader)(nil), "grpc.binarylog.v1.ServerHeader")
+	proto.RegisterType((*Trailer)(nil), "grpc.binarylog.v1.Trailer")
+	proto.RegisterType((*Message)(nil), "grpc.binarylog.v1.Message")
+	proto.RegisterType((*Metadata)(nil), "grpc.binarylog.v1.Metadata")
+	proto.RegisterType((*MetadataEntry)(nil), "grpc.binarylog.v1.MetadataEntry")
+	proto.RegisterType((*Address)(nil), "grpc.binarylog.v1.Address")
+	proto.RegisterEnum("grpc.binarylog.v1.GrpcLogEntry_EventType", GrpcLogEntry_EventType_name, GrpcLogEntry_EventType_value)
+	proto.RegisterEnum("grpc.binarylog.v1.GrpcLogEntry_Logger", GrpcLogEntry_Logger_name, GrpcLogEntry_Logger_value)
+	proto.RegisterEnum("grpc.binarylog.v1.Address_Type", Address_Type_name, Address_Type_value)
+}
+
+func init() {
+	proto.RegisterFile("grpc/binarylog/grpc_binarylog_v1/binarylog.proto", fileDescriptor_binarylog_264c8c9c551ce911)
+}
+
+var fileDescriptor_binarylog_264c8c9c551ce911 = []byte{
+	// 900 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x55, 0x51, 0x6f, 0xe3, 0x44,
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+	0x0a, 0x42, 0x72, 0xb9, 0x94, 0xeb, 0xf1, 0x02, 0x52, 0x92, 0xfa, 0xd2, 0x88, 0x5c, 0x1a, 0x6d,
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+	0xc5, 0x83, 0xdb, 0xce, 0x8a, 0x46, 0x62, 0xba, 0x8e, 0x29, 0x96, 0x61, 0xe8, 0x3b, 0xa8, 0x84,
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+	0x3d, 0x20, 0xd3, 0x93, 0xbc, 0x6b, 0x49, 0xbb, 0x7e, 0x82, 0xeb, 0xb3, 0x82, 0x9d, 0xea, 0x24,
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+	0x04, 0x7d, 0x41, 0x93, 0x84, 0xf8, 0xd4, 0x3c, 0xc8, 0x7f, 0xcb, 0x8e, 0xc2, 0x1b, 0xc5, 0xb8,
+	0x7e, 0x82, 0x73, 0x72, 0x1a, 0x27, 0x38, 0x09, 0x42, 0xca, 0xcd, 0xea, 0xa3, 0x71, 0x53, 0xc5,
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+	0xd4, 0x07, 0x00, 0x00,
+}
diff --git a/vendor/google.golang.org/grpc/call.go b/vendor/google.golang.org/grpc/call.go
new file mode 100644
index 0000000..9e20e4d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/call.go
@@ -0,0 +1,74 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+)
+
+// Invoke sends the RPC request on the wire and returns after response is
+// received.  This is typically called by generated code.
+//
+// All errors returned by Invoke are compatible with the status package.
+func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
+	// allow interceptor to see all applicable call options, which means those
+	// configured as defaults from dial option as well as per-call options
+	opts = combine(cc.dopts.callOptions, opts)
+
+	if cc.dopts.unaryInt != nil {
+		return cc.dopts.unaryInt(ctx, method, args, reply, cc, invoke, opts...)
+	}
+	return invoke(ctx, method, args, reply, cc, opts...)
+}
+
+func combine(o1 []CallOption, o2 []CallOption) []CallOption {
+	// we don't use append because o1 could have extra capacity whose
+	// elements would be overwritten, which could cause inadvertent
+	// sharing (and race conditions) between concurrent calls
+	if len(o1) == 0 {
+		return o2
+	} else if len(o2) == 0 {
+		return o1
+	}
+	ret := make([]CallOption, len(o1)+len(o2))
+	copy(ret, o1)
+	copy(ret[len(o1):], o2)
+	return ret
+}
+
+// Invoke sends the RPC request on the wire and returns after response is
+// received.  This is typically called by generated code.
+//
+// DEPRECATED: Use ClientConn.Invoke instead.
+func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+	return cc.Invoke(ctx, method, args, reply, opts...)
+}
+
+var unaryStreamDesc = &StreamDesc{ServerStreams: false, ClientStreams: false}
+
+func invoke(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+	cs, err := newClientStream(ctx, unaryStreamDesc, cc, method, opts...)
+	if err != nil {
+		return err
+	}
+	if err := cs.SendMsg(req); err != nil {
+		return err
+	}
+	return cs.RecvMsg(reply)
+}
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
new file mode 100644
index 0000000..14ce9c7
--- /dev/null
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -0,0 +1,1544 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math"
+	"net"
+	"reflect"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/balancer/base"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/backoff"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/serviceconfig"
+	"google.golang.org/grpc/status"
+
+	_ "google.golang.org/grpc/balancer/roundrobin"           // To register roundrobin.
+	_ "google.golang.org/grpc/internal/resolver/dns"         // To register dns resolver.
+	_ "google.golang.org/grpc/internal/resolver/passthrough" // To register passthrough resolver.
+)
+
+const (
+	// minimum time to give a connection to complete
+	minConnectTimeout = 20 * time.Second
+	// must match grpclbName in grpclb/grpclb.go
+	grpclbName = "grpclb"
+)
+
+var (
+	// ErrClientConnClosing indicates that the operation is illegal because
+	// the ClientConn is closing.
+	//
+	// Deprecated: this error should not be relied upon by users; use the status
+	// code of Canceled instead.
+	ErrClientConnClosing = status.Error(codes.Canceled, "grpc: the client connection is closing")
+	// errConnDrain indicates that the connection starts to be drained and does not accept any new RPCs.
+	errConnDrain = errors.New("grpc: the connection is drained")
+	// errConnClosing indicates that the connection is closing.
+	errConnClosing = errors.New("grpc: the connection is closing")
+	// errBalancerClosed indicates that the balancer is closed.
+	errBalancerClosed = errors.New("grpc: balancer is closed")
+	// invalidDefaultServiceConfigErrPrefix is used to prefix the json parsing error for the default
+	// service config.
+	invalidDefaultServiceConfigErrPrefix = "grpc: the provided default service config is invalid"
+)
+
+// The following errors are returned from Dial and DialContext
+var (
+	// errNoTransportSecurity indicates that there is no transport security
+	// being set for ClientConn. Users should either set one or explicitly
+	// call WithInsecure DialOption to disable security.
+	errNoTransportSecurity = errors.New("grpc: no transport security set (use grpc.WithInsecure() explicitly or set credentials)")
+	// errTransportCredsAndBundle indicates that creds bundle is used together
+	// with other individual Transport Credentials.
+	errTransportCredsAndBundle = errors.New("grpc: credentials.Bundle may not be used with individual TransportCredentials")
+	// errTransportCredentialsMissing indicates that users want to transmit security
+	// information (e.g., OAuth2 token) which requires secure connection on an insecure
+	// connection.
+	errTransportCredentialsMissing = errors.New("grpc: the credentials require transport level security (use grpc.WithTransportCredentials() to set)")
+	// errCredentialsConflict indicates that grpc.WithTransportCredentials()
+	// and grpc.WithInsecure() are both called for a connection.
+	errCredentialsConflict = errors.New("grpc: transport credentials are set for an insecure connection (grpc.WithTransportCredentials() and grpc.WithInsecure() are both called)")
+)
+
+const (
+	defaultClientMaxReceiveMessageSize = 1024 * 1024 * 4
+	defaultClientMaxSendMessageSize    = math.MaxInt32
+	// http2IOBufSize specifies the buffer size for sending frames.
+	defaultWriteBufSize = 32 * 1024
+	defaultReadBufSize  = 32 * 1024
+)
+
+// Dial creates a client connection to the given target.
+func Dial(target string, opts ...DialOption) (*ClientConn, error) {
+	return DialContext(context.Background(), target, opts...)
+}
+
+// DialContext creates a client connection to the given target. By default, it's
+// a non-blocking dial (the function won't wait for connections to be
+// established, and connecting happens in the background). To make it a blocking
+// dial, use WithBlock() dial option.
+//
+// In the non-blocking case, the ctx does not act against the connection. It
+// only controls the setup steps.
+//
+// In the blocking case, ctx can be used to cancel or expire the pending
+// connection. Once this function returns, the cancellation and expiration of
+// ctx will be noop. Users should call ClientConn.Close to terminate all the
+// pending operations after this function returns.
+//
+// The target name syntax is defined in
+// https://github.com/grpc/grpc/blob/master/doc/naming.md.
+// e.g. to use dns resolver, a "dns:///" prefix should be applied to the target.
+func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
+	cc := &ClientConn{
+		target:            target,
+		csMgr:             &connectivityStateManager{},
+		conns:             make(map[*addrConn]struct{}),
+		dopts:             defaultDialOptions(),
+		blockingpicker:    newPickerWrapper(),
+		czData:            new(channelzData),
+		firstResolveEvent: grpcsync.NewEvent(),
+	}
+	cc.retryThrottler.Store((*retryThrottler)(nil))
+	cc.ctx, cc.cancel = context.WithCancel(context.Background())
+
+	for _, opt := range opts {
+		opt.apply(&cc.dopts)
+	}
+
+	chainUnaryClientInterceptors(cc)
+	chainStreamClientInterceptors(cc)
+
+	defer func() {
+		if err != nil {
+			cc.Close()
+		}
+	}()
+
+	if channelz.IsOn() {
+		if cc.dopts.channelzParentID != 0 {
+			cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, cc.dopts.channelzParentID, target)
+			channelz.AddTraceEvent(cc.channelzID, &channelz.TraceEventDesc{
+				Desc:     "Channel Created",
+				Severity: channelz.CtINFO,
+				Parent: &channelz.TraceEventDesc{
+					Desc:     fmt.Sprintf("Nested Channel(id:%d) created", cc.channelzID),
+					Severity: channelz.CtINFO,
+				},
+			})
+		} else {
+			cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, 0, target)
+			channelz.AddTraceEvent(cc.channelzID, &channelz.TraceEventDesc{
+				Desc:     "Channel Created",
+				Severity: channelz.CtINFO,
+			})
+		}
+		cc.csMgr.channelzID = cc.channelzID
+	}
+
+	if !cc.dopts.insecure {
+		if cc.dopts.copts.TransportCredentials == nil && cc.dopts.copts.CredsBundle == nil {
+			return nil, errNoTransportSecurity
+		}
+		if cc.dopts.copts.TransportCredentials != nil && cc.dopts.copts.CredsBundle != nil {
+			return nil, errTransportCredsAndBundle
+		}
+	} else {
+		if cc.dopts.copts.TransportCredentials != nil || cc.dopts.copts.CredsBundle != nil {
+			return nil, errCredentialsConflict
+		}
+		for _, cd := range cc.dopts.copts.PerRPCCredentials {
+			if cd.RequireTransportSecurity() {
+				return nil, errTransportCredentialsMissing
+			}
+		}
+	}
+
+	if cc.dopts.defaultServiceConfigRawJSON != nil {
+		scpr := parseServiceConfig(*cc.dopts.defaultServiceConfigRawJSON)
+		if scpr.Err != nil {
+			return nil, fmt.Errorf("%s: %v", invalidDefaultServiceConfigErrPrefix, scpr.Err)
+		}
+		cc.dopts.defaultServiceConfig, _ = scpr.Config.(*ServiceConfig)
+	}
+	cc.mkp = cc.dopts.copts.KeepaliveParams
+
+	if cc.dopts.copts.Dialer == nil {
+		cc.dopts.copts.Dialer = newProxyDialer(
+			func(ctx context.Context, addr string) (net.Conn, error) {
+				network, addr := parseDialTarget(addr)
+				return (&net.Dialer{}).DialContext(ctx, network, addr)
+			},
+		)
+	}
+
+	if cc.dopts.copts.UserAgent != "" {
+		cc.dopts.copts.UserAgent += " " + grpcUA
+	} else {
+		cc.dopts.copts.UserAgent = grpcUA
+	}
+
+	if cc.dopts.timeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(ctx, cc.dopts.timeout)
+		defer cancel()
+	}
+	defer func() {
+		select {
+		case <-ctx.Done():
+			conn, err = nil, ctx.Err()
+		default:
+		}
+	}()
+
+	scSet := false
+	if cc.dopts.scChan != nil {
+		// Try to get an initial service config.
+		select {
+		case sc, ok := <-cc.dopts.scChan:
+			if ok {
+				cc.sc = &sc
+				scSet = true
+			}
+		default:
+		}
+	}
+	if cc.dopts.bs == nil {
+		cc.dopts.bs = backoff.DefaultExponential
+	}
+	if cc.dopts.resolverBuilder == nil {
+		// Only try to parse target when resolver builder is not already set.
+		cc.parsedTarget = parseTarget(cc.target)
+		grpclog.Infof("parsed scheme: %q", cc.parsedTarget.Scheme)
+		cc.dopts.resolverBuilder = resolver.Get(cc.parsedTarget.Scheme)
+		if cc.dopts.resolverBuilder == nil {
+			// If resolver builder is still nil, the parsed target's scheme is
+			// not registered. Fallback to default resolver and set Endpoint to
+			// the original target.
+			grpclog.Infof("scheme %q not registered, fallback to default scheme", cc.parsedTarget.Scheme)
+			cc.parsedTarget = resolver.Target{
+				Scheme:   resolver.GetDefaultScheme(),
+				Endpoint: target,
+			}
+			cc.dopts.resolverBuilder = resolver.Get(cc.parsedTarget.Scheme)
+		}
+	} else {
+		cc.parsedTarget = resolver.Target{Endpoint: target}
+	}
+	creds := cc.dopts.copts.TransportCredentials
+	if creds != nil && creds.Info().ServerName != "" {
+		cc.authority = creds.Info().ServerName
+	} else if cc.dopts.insecure && cc.dopts.authority != "" {
+		cc.authority = cc.dopts.authority
+	} else {
+		// Use endpoint from "scheme://authority/endpoint" as the default
+		// authority for ClientConn.
+		cc.authority = cc.parsedTarget.Endpoint
+	}
+
+	if cc.dopts.scChan != nil && !scSet {
+		// Blocking wait for the initial service config.
+		select {
+		case sc, ok := <-cc.dopts.scChan:
+			if ok {
+				cc.sc = &sc
+			}
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
+	if cc.dopts.scChan != nil {
+		go cc.scWatcher()
+	}
+
+	var credsClone credentials.TransportCredentials
+	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
+		credsClone = creds.Clone()
+	}
+	cc.balancerBuildOpts = balancer.BuildOptions{
+		DialCreds:        credsClone,
+		CredsBundle:      cc.dopts.copts.CredsBundle,
+		Dialer:           cc.dopts.copts.Dialer,
+		ChannelzParentID: cc.channelzID,
+		Target:           cc.parsedTarget,
+	}
+
+	// Build the resolver.
+	rWrapper, err := newCCResolverWrapper(cc)
+	if err != nil {
+		return nil, fmt.Errorf("failed to build resolver: %v", err)
+	}
+
+	cc.mu.Lock()
+	cc.resolverWrapper = rWrapper
+	cc.mu.Unlock()
+	// A blocking dial blocks until the clientConn is ready.
+	if cc.dopts.block {
+		for {
+			s := cc.GetState()
+			if s == connectivity.Ready {
+				break
+			} else if cc.dopts.copts.FailOnNonTempDialError && s == connectivity.TransientFailure {
+				if err = cc.blockingpicker.connectionError(); err != nil {
+					terr, ok := err.(interface {
+						Temporary() bool
+					})
+					if ok && !terr.Temporary() {
+						return nil, err
+					}
+				}
+			}
+			if !cc.WaitForStateChange(ctx, s) {
+				// ctx got timeout or canceled.
+				return nil, ctx.Err()
+			}
+		}
+	}
+
+	return cc, nil
+}
+
+// chainUnaryClientInterceptors chains all unary client interceptors into one.
+func chainUnaryClientInterceptors(cc *ClientConn) {
+	interceptors := cc.dopts.chainUnaryInts
+	// Prepend dopts.unaryInt to the chaining interceptors if it exists, since unaryInt will
+	// be executed before any other chained interceptors.
+	if cc.dopts.unaryInt != nil {
+		interceptors = append([]UnaryClientInterceptor{cc.dopts.unaryInt}, interceptors...)
+	}
+	var chainedInt UnaryClientInterceptor
+	if len(interceptors) == 0 {
+		chainedInt = nil
+	} else if len(interceptors) == 1 {
+		chainedInt = interceptors[0]
+	} else {
+		chainedInt = func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error {
+			return interceptors[0](ctx, method, req, reply, cc, getChainUnaryInvoker(interceptors, 0, invoker), opts...)
+		}
+	}
+	cc.dopts.unaryInt = chainedInt
+}
+
+// getChainUnaryInvoker recursively generate the chained unary invoker.
+func getChainUnaryInvoker(interceptors []UnaryClientInterceptor, curr int, finalInvoker UnaryInvoker) UnaryInvoker {
+	if curr == len(interceptors)-1 {
+		return finalInvoker
+	}
+	return func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+		return interceptors[curr+1](ctx, method, req, reply, cc, getChainUnaryInvoker(interceptors, curr+1, finalInvoker), opts...)
+	}
+}
+
+// chainStreamClientInterceptors chains all stream client interceptors into one.
+func chainStreamClientInterceptors(cc *ClientConn) {
+	interceptors := cc.dopts.chainStreamInts
+	// Prepend dopts.streamInt to the chaining interceptors if it exists, since streamInt will
+	// be executed before any other chained interceptors.
+	if cc.dopts.streamInt != nil {
+		interceptors = append([]StreamClientInterceptor{cc.dopts.streamInt}, interceptors...)
+	}
+	var chainedInt StreamClientInterceptor
+	if len(interceptors) == 0 {
+		chainedInt = nil
+	} else if len(interceptors) == 1 {
+		chainedInt = interceptors[0]
+	} else {
+		chainedInt = func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error) {
+			return interceptors[0](ctx, desc, cc, method, getChainStreamer(interceptors, 0, streamer), opts...)
+		}
+	}
+	cc.dopts.streamInt = chainedInt
+}
+
+// getChainStreamer recursively generate the chained client stream constructor.
+func getChainStreamer(interceptors []StreamClientInterceptor, curr int, finalStreamer Streamer) Streamer {
+	if curr == len(interceptors)-1 {
+		return finalStreamer
+	}
+	return func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error) {
+		return interceptors[curr+1](ctx, desc, cc, method, getChainStreamer(interceptors, curr+1, finalStreamer), opts...)
+	}
+}
+
+// connectivityStateManager keeps the connectivity.State of ClientConn.
+// This struct will eventually be exported so the balancers can access it.
+type connectivityStateManager struct {
+	mu         sync.Mutex
+	state      connectivity.State
+	notifyChan chan struct{}
+	channelzID int64
+}
+
+// updateState updates the connectivity.State of ClientConn.
+// If there's a change it notifies goroutines waiting on state change to
+// happen.
+func (csm *connectivityStateManager) updateState(state connectivity.State) {
+	csm.mu.Lock()
+	defer csm.mu.Unlock()
+	if csm.state == connectivity.Shutdown {
+		return
+	}
+	if csm.state == state {
+		return
+	}
+	csm.state = state
+	if channelz.IsOn() {
+		channelz.AddTraceEvent(csm.channelzID, &channelz.TraceEventDesc{
+			Desc:     fmt.Sprintf("Channel Connectivity change to %v", state),
+			Severity: channelz.CtINFO,
+		})
+	}
+	if csm.notifyChan != nil {
+		// There are other goroutines waiting on this channel.
+		close(csm.notifyChan)
+		csm.notifyChan = nil
+	}
+}
+
+func (csm *connectivityStateManager) getState() connectivity.State {
+	csm.mu.Lock()
+	defer csm.mu.Unlock()
+	return csm.state
+}
+
+func (csm *connectivityStateManager) getNotifyChan() <-chan struct{} {
+	csm.mu.Lock()
+	defer csm.mu.Unlock()
+	if csm.notifyChan == nil {
+		csm.notifyChan = make(chan struct{})
+	}
+	return csm.notifyChan
+}
+
+// ClientConn represents a virtual connection to a conceptual endpoint, to
+// perform RPCs.
+//
+// A ClientConn is free to have zero or more actual connections to the endpoint
+// based on configuration, load, etc. It is also free to determine which actual
+// endpoints to use and may change it every RPC, permitting client-side load
+// balancing.
+//
+// A ClientConn encapsulates a range of functionality including name
+// resolution, TCP connection establishment (with retries and backoff) and TLS
+// handshakes. It also handles errors on established connections by
+// re-resolving the name and reconnecting.
+type ClientConn struct {
+	ctx    context.Context
+	cancel context.CancelFunc
+
+	target       string
+	parsedTarget resolver.Target
+	authority    string
+	dopts        dialOptions
+	csMgr        *connectivityStateManager
+
+	balancerBuildOpts balancer.BuildOptions
+	blockingpicker    *pickerWrapper
+
+	mu              sync.RWMutex
+	resolverWrapper *ccResolverWrapper
+	sc              *ServiceConfig
+	conns           map[*addrConn]struct{}
+	// Keepalive parameter can be updated if a GoAway is received.
+	mkp             keepalive.ClientParameters
+	curBalancerName string
+	balancerWrapper *ccBalancerWrapper
+	retryThrottler  atomic.Value
+
+	firstResolveEvent *grpcsync.Event
+
+	channelzID int64 // channelz unique identification number
+	czData     *channelzData
+}
+
+// WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or
+// ctx expires. A true value is returned in former case and false in latter.
+// This is an EXPERIMENTAL API.
+func (cc *ClientConn) WaitForStateChange(ctx context.Context, sourceState connectivity.State) bool {
+	ch := cc.csMgr.getNotifyChan()
+	if cc.csMgr.getState() != sourceState {
+		return true
+	}
+	select {
+	case <-ctx.Done():
+		return false
+	case <-ch:
+		return true
+	}
+}
+
+// GetState returns the connectivity.State of ClientConn.
+// This is an EXPERIMENTAL API.
+func (cc *ClientConn) GetState() connectivity.State {
+	return cc.csMgr.getState()
+}
+
+func (cc *ClientConn) scWatcher() {
+	for {
+		select {
+		case sc, ok := <-cc.dopts.scChan:
+			if !ok {
+				return
+			}
+			cc.mu.Lock()
+			// TODO: load balance policy runtime change is ignored.
+			// We may revisit this decision in the future.
+			cc.sc = &sc
+			cc.mu.Unlock()
+		case <-cc.ctx.Done():
+			return
+		}
+	}
+}
+
+// waitForResolvedAddrs blocks until the resolver has provided addresses or the
+// context expires.  Returns nil unless the context expires first; otherwise
+// returns a status error based on the context.
+func (cc *ClientConn) waitForResolvedAddrs(ctx context.Context) error {
+	// This is on the RPC path, so we use a fast path to avoid the
+	// more-expensive "select" below after the resolver has returned once.
+	if cc.firstResolveEvent.HasFired() {
+		return nil
+	}
+	select {
+	case <-cc.firstResolveEvent.Done():
+		return nil
+	case <-ctx.Done():
+		return status.FromContextError(ctx.Err()).Err()
+	case <-cc.ctx.Done():
+		return ErrClientConnClosing
+	}
+}
+
+var emptyServiceConfig *ServiceConfig
+
+func init() {
+	cfg := parseServiceConfig("{}")
+	if cfg.Err != nil {
+		panic(fmt.Sprintf("impossible error parsing empty service config: %v", cfg.Err))
+	}
+	emptyServiceConfig = cfg.Config.(*ServiceConfig)
+}
+
+func (cc *ClientConn) maybeApplyDefaultServiceConfig(addrs []resolver.Address) {
+	if cc.sc != nil {
+		cc.applyServiceConfigAndBalancer(cc.sc, addrs)
+		return
+	}
+	if cc.dopts.defaultServiceConfig != nil {
+		cc.applyServiceConfigAndBalancer(cc.dopts.defaultServiceConfig, addrs)
+	} else {
+		cc.applyServiceConfigAndBalancer(emptyServiceConfig, addrs)
+	}
+}
+
+func (cc *ClientConn) updateResolverState(s resolver.State, err error) error {
+	defer cc.firstResolveEvent.Fire()
+	cc.mu.Lock()
+	// Check if the ClientConn is already closed. Some fields (e.g.
+	// balancerWrapper) are set to nil when closing the ClientConn, and could
+	// cause nil pointer panic if we don't have this check.
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return nil
+	}
+
+	if err != nil {
+		// May need to apply the initial service config in case the resolver
+		// doesn't support service configs, or doesn't provide a service config
+		// with the new addresses.
+		cc.maybeApplyDefaultServiceConfig(nil)
+
+		if cc.balancerWrapper != nil {
+			cc.balancerWrapper.resolverError(err)
+		}
+
+		// No addresses are valid with err set; return early.
+		cc.mu.Unlock()
+		return balancer.ErrBadResolverState
+	}
+
+	var ret error
+	if cc.dopts.disableServiceConfig || s.ServiceConfig == nil {
+		cc.maybeApplyDefaultServiceConfig(s.Addresses)
+		// TODO: do we need to apply a failing LB policy if there is no
+		// default, per the error handling design?
+	} else {
+		if sc, ok := s.ServiceConfig.Config.(*ServiceConfig); s.ServiceConfig.Err == nil && ok {
+			cc.applyServiceConfigAndBalancer(sc, s.Addresses)
+		} else {
+			ret = balancer.ErrBadResolverState
+			if cc.balancerWrapper == nil {
+				var err error
+				if s.ServiceConfig.Err != nil {
+					err = status.Errorf(codes.Unavailable, "error parsing service config: %v", s.ServiceConfig.Err)
+				} else {
+					err = status.Errorf(codes.Unavailable, "illegal service config type: %T", s.ServiceConfig.Config)
+				}
+				cc.blockingpicker.updatePicker(base.NewErrPicker(err))
+				cc.csMgr.updateState(connectivity.TransientFailure)
+				cc.mu.Unlock()
+				return ret
+			}
+		}
+	}
+
+	var balCfg serviceconfig.LoadBalancingConfig
+	if cc.dopts.balancerBuilder == nil && cc.sc != nil && cc.sc.lbConfig != nil {
+		balCfg = cc.sc.lbConfig.cfg
+	}
+
+	cbn := cc.curBalancerName
+	bw := cc.balancerWrapper
+	cc.mu.Unlock()
+	if cbn != grpclbName {
+		// Filter any grpclb addresses since we don't have the grpclb balancer.
+		for i := 0; i < len(s.Addresses); {
+			if s.Addresses[i].Type == resolver.GRPCLB {
+				copy(s.Addresses[i:], s.Addresses[i+1:])
+				s.Addresses = s.Addresses[:len(s.Addresses)-1]
+				continue
+			}
+			i++
+		}
+	}
+	uccsErr := bw.updateClientConnState(&balancer.ClientConnState{ResolverState: s, BalancerConfig: balCfg})
+	if ret == nil {
+		ret = uccsErr // prefer ErrBadResolver state since any other error is
+		// currently meaningless to the caller.
+	}
+	return ret
+}
+
+// switchBalancer starts the switching from current balancer to the balancer
+// with the given name.
+//
+// It will NOT send the current address list to the new balancer. If needed,
+// caller of this function should send address list to the new balancer after
+// this function returns.
+//
+// Caller must hold cc.mu.
+func (cc *ClientConn) switchBalancer(name string) {
+	if strings.EqualFold(cc.curBalancerName, name) {
+		return
+	}
+
+	grpclog.Infof("ClientConn switching balancer to %q", name)
+	if cc.dopts.balancerBuilder != nil {
+		grpclog.Infoln("ignoring balancer switching: Balancer DialOption used instead")
+		return
+	}
+	if cc.balancerWrapper != nil {
+		cc.balancerWrapper.close()
+	}
+
+	builder := balancer.Get(name)
+	if channelz.IsOn() {
+		if builder == nil {
+			channelz.AddTraceEvent(cc.channelzID, &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Channel switches to new LB policy %q due to fallback from invalid balancer name", PickFirstBalancerName),
+				Severity: channelz.CtWarning,
+			})
+		} else {
+			channelz.AddTraceEvent(cc.channelzID, &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Channel switches to new LB policy %q", name),
+				Severity: channelz.CtINFO,
+			})
+		}
+	}
+	if builder == nil {
+		grpclog.Infof("failed to get balancer builder for: %v, using pick_first instead", name)
+		builder = newPickfirstBuilder()
+	}
+
+	cc.curBalancerName = builder.Name()
+	cc.balancerWrapper = newCCBalancerWrapper(cc, builder, cc.balancerBuildOpts)
+}
+
+func (cc *ClientConn) handleSubConnStateChange(sc balancer.SubConn, s connectivity.State, err error) {
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return
+	}
+	// TODO(bar switching) send updates to all balancer wrappers when balancer
+	// gracefully switching is supported.
+	cc.balancerWrapper.handleSubConnStateChange(sc, s, err)
+	cc.mu.Unlock()
+}
+
+// newAddrConn creates an addrConn for addrs and adds it to cc.conns.
+//
+// Caller needs to make sure len(addrs) > 0.
+func (cc *ClientConn) newAddrConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (*addrConn, error) {
+	ac := &addrConn{
+		cc:           cc,
+		addrs:        addrs,
+		scopts:       opts,
+		dopts:        cc.dopts,
+		czData:       new(channelzData),
+		resetBackoff: make(chan struct{}),
+	}
+	ac.ctx, ac.cancel = context.WithCancel(cc.ctx)
+	// Track ac in cc. This needs to be done before any getTransport(...) is called.
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return nil, ErrClientConnClosing
+	}
+	if channelz.IsOn() {
+		ac.channelzID = channelz.RegisterSubChannel(ac, cc.channelzID, "")
+		channelz.AddTraceEvent(ac.channelzID, &channelz.TraceEventDesc{
+			Desc:     "Subchannel Created",
+			Severity: channelz.CtINFO,
+			Parent: &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Subchannel(id:%d) created", ac.channelzID),
+				Severity: channelz.CtINFO,
+			},
+		})
+	}
+	cc.conns[ac] = struct{}{}
+	cc.mu.Unlock()
+	return ac, nil
+}
+
+// removeAddrConn removes the addrConn in the subConn from clientConn.
+// It also tears down the ac with the given error.
+func (cc *ClientConn) removeAddrConn(ac *addrConn, err error) {
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return
+	}
+	delete(cc.conns, ac)
+	cc.mu.Unlock()
+	ac.tearDown(err)
+}
+
+func (cc *ClientConn) channelzMetric() *channelz.ChannelInternalMetric {
+	return &channelz.ChannelInternalMetric{
+		State:                    cc.GetState(),
+		Target:                   cc.target,
+		CallsStarted:             atomic.LoadInt64(&cc.czData.callsStarted),
+		CallsSucceeded:           atomic.LoadInt64(&cc.czData.callsSucceeded),
+		CallsFailed:              atomic.LoadInt64(&cc.czData.callsFailed),
+		LastCallStartedTimestamp: time.Unix(0, atomic.LoadInt64(&cc.czData.lastCallStartedTime)),
+	}
+}
+
+// Target returns the target string of the ClientConn.
+// This is an EXPERIMENTAL API.
+func (cc *ClientConn) Target() string {
+	return cc.target
+}
+
+func (cc *ClientConn) incrCallsStarted() {
+	atomic.AddInt64(&cc.czData.callsStarted, 1)
+	atomic.StoreInt64(&cc.czData.lastCallStartedTime, time.Now().UnixNano())
+}
+
+func (cc *ClientConn) incrCallsSucceeded() {
+	atomic.AddInt64(&cc.czData.callsSucceeded, 1)
+}
+
+func (cc *ClientConn) incrCallsFailed() {
+	atomic.AddInt64(&cc.czData.callsFailed, 1)
+}
+
+// connect starts creating a transport.
+// It does nothing if the ac is not IDLE.
+// TODO(bar) Move this to the addrConn section.
+func (ac *addrConn) connect() error {
+	ac.mu.Lock()
+	if ac.state == connectivity.Shutdown {
+		ac.mu.Unlock()
+		return errConnClosing
+	}
+	if ac.state != connectivity.Idle {
+		ac.mu.Unlock()
+		return nil
+	}
+	// Update connectivity state within the lock to prevent subsequent or
+	// concurrent calls from resetting the transport more than once.
+	ac.updateConnectivityState(connectivity.Connecting, nil)
+	ac.mu.Unlock()
+
+	// Start a goroutine connecting to the server asynchronously.
+	go ac.resetTransport()
+	return nil
+}
+
+// tryUpdateAddrs tries to update ac.addrs with the new addresses list.
+//
+// If ac is Connecting, it returns false. The caller should tear down the ac and
+// create a new one. Note that the backoff will be reset when this happens.
+//
+// If ac is TransientFailure, it updates ac.addrs and returns true. The updated
+// addresses will be picked up by retry in the next iteration after backoff.
+//
+// If ac is Shutdown or Idle, it updates ac.addrs and returns true.
+//
+// If ac is Ready, it checks whether current connected address of ac is in the
+// new addrs list.
+//  - If true, it updates ac.addrs and returns true. The ac will keep using
+//    the existing connection.
+//  - If false, it does nothing and returns false.
+func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
+	ac.mu.Lock()
+	defer ac.mu.Unlock()
+	grpclog.Infof("addrConn: tryUpdateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
+	if ac.state == connectivity.Shutdown ||
+		ac.state == connectivity.TransientFailure ||
+		ac.state == connectivity.Idle {
+		ac.addrs = addrs
+		return true
+	}
+
+	if ac.state == connectivity.Connecting {
+		return false
+	}
+
+	// ac.state is Ready, try to find the connected address.
+	var curAddrFound bool
+	for _, a := range addrs {
+		if reflect.DeepEqual(ac.curAddr, a) {
+			curAddrFound = true
+			break
+		}
+	}
+	grpclog.Infof("addrConn: tryUpdateAddrs curAddrFound: %v", curAddrFound)
+	if curAddrFound {
+		ac.addrs = addrs
+	}
+
+	return curAddrFound
+}
+
+// GetMethodConfig gets the method config of the input method.
+// If there's an exact match for input method (i.e. /service/method), we return
+// the corresponding MethodConfig.
+// If there isn't an exact match for the input method, we look for the default config
+// under the service (i.e /service/). If there is a default MethodConfig for
+// the service, we return it.
+// Otherwise, we return an empty MethodConfig.
+func (cc *ClientConn) GetMethodConfig(method string) MethodConfig {
+	// TODO: Avoid the locking here.
+	cc.mu.RLock()
+	defer cc.mu.RUnlock()
+	if cc.sc == nil {
+		return MethodConfig{}
+	}
+	m, ok := cc.sc.Methods[method]
+	if !ok {
+		i := strings.LastIndex(method, "/")
+		m = cc.sc.Methods[method[:i+1]]
+	}
+	return m
+}
+
+func (cc *ClientConn) healthCheckConfig() *healthCheckConfig {
+	cc.mu.RLock()
+	defer cc.mu.RUnlock()
+	if cc.sc == nil {
+		return nil
+	}
+	return cc.sc.healthCheckConfig
+}
+
+func (cc *ClientConn) getTransport(ctx context.Context, failfast bool, method string) (transport.ClientTransport, func(balancer.DoneInfo), error) {
+	t, done, err := cc.blockingpicker.pick(ctx, failfast, balancer.PickInfo{
+		Ctx:            ctx,
+		FullMethodName: method,
+	})
+	if err != nil {
+		return nil, nil, toRPCErr(err)
+	}
+	return t, done, nil
+}
+
+func (cc *ClientConn) applyServiceConfigAndBalancer(sc *ServiceConfig, addrs []resolver.Address) {
+	if sc == nil {
+		// should never reach here.
+		return
+	}
+	cc.sc = sc
+
+	if cc.sc.retryThrottling != nil {
+		newThrottler := &retryThrottler{
+			tokens: cc.sc.retryThrottling.MaxTokens,
+			max:    cc.sc.retryThrottling.MaxTokens,
+			thresh: cc.sc.retryThrottling.MaxTokens / 2,
+			ratio:  cc.sc.retryThrottling.TokenRatio,
+		}
+		cc.retryThrottler.Store(newThrottler)
+	} else {
+		cc.retryThrottler.Store((*retryThrottler)(nil))
+	}
+
+	if cc.dopts.balancerBuilder == nil {
+		// Only look at balancer types and switch balancer if balancer dial
+		// option is not set.
+		var newBalancerName string
+		if cc.sc != nil && cc.sc.lbConfig != nil {
+			newBalancerName = cc.sc.lbConfig.name
+		} else {
+			var isGRPCLB bool
+			for _, a := range addrs {
+				if a.Type == resolver.GRPCLB {
+					isGRPCLB = true
+					break
+				}
+			}
+			if isGRPCLB {
+				newBalancerName = grpclbName
+			} else if cc.sc != nil && cc.sc.LB != nil {
+				newBalancerName = *cc.sc.LB
+			} else {
+				newBalancerName = PickFirstBalancerName
+			}
+		}
+		cc.switchBalancer(newBalancerName)
+	} else if cc.balancerWrapper == nil {
+		// Balancer dial option was set, and this is the first time handling
+		// resolved addresses. Build a balancer with dopts.balancerBuilder.
+		cc.curBalancerName = cc.dopts.balancerBuilder.Name()
+		cc.balancerWrapper = newCCBalancerWrapper(cc, cc.dopts.balancerBuilder, cc.balancerBuildOpts)
+	}
+}
+
+func (cc *ClientConn) resolveNow(o resolver.ResolveNowOptions) {
+	cc.mu.RLock()
+	r := cc.resolverWrapper
+	cc.mu.RUnlock()
+	if r == nil {
+		return
+	}
+	go r.resolveNow(o)
+}
+
+// ResetConnectBackoff wakes up all subchannels in transient failure and causes
+// them to attempt another connection immediately.  It also resets the backoff
+// times used for subsequent attempts regardless of the current state.
+//
+// In general, this function should not be used.  Typical service or network
+// outages result in a reasonable client reconnection strategy by default.
+// However, if a previously unavailable network becomes available, this may be
+// used to trigger an immediate reconnect.
+//
+// This API is EXPERIMENTAL.
+func (cc *ClientConn) ResetConnectBackoff() {
+	cc.mu.Lock()
+	conns := cc.conns
+	cc.mu.Unlock()
+	for ac := range conns {
+		ac.resetConnectBackoff()
+	}
+}
+
+// Close tears down the ClientConn and all underlying connections.
+func (cc *ClientConn) Close() error {
+	defer cc.cancel()
+
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return ErrClientConnClosing
+	}
+	conns := cc.conns
+	cc.conns = nil
+	cc.csMgr.updateState(connectivity.Shutdown)
+
+	rWrapper := cc.resolverWrapper
+	cc.resolverWrapper = nil
+	bWrapper := cc.balancerWrapper
+	cc.balancerWrapper = nil
+	cc.mu.Unlock()
+
+	cc.blockingpicker.close()
+
+	if rWrapper != nil {
+		rWrapper.close()
+	}
+	if bWrapper != nil {
+		bWrapper.close()
+	}
+
+	for ac := range conns {
+		ac.tearDown(ErrClientConnClosing)
+	}
+	if channelz.IsOn() {
+		ted := &channelz.TraceEventDesc{
+			Desc:     "Channel Deleted",
+			Severity: channelz.CtINFO,
+		}
+		if cc.dopts.channelzParentID != 0 {
+			ted.Parent = &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Nested channel(id:%d) deleted", cc.channelzID),
+				Severity: channelz.CtINFO,
+			}
+		}
+		channelz.AddTraceEvent(cc.channelzID, ted)
+		// TraceEvent needs to be called before RemoveEntry, as TraceEvent may add trace reference to
+		// the entity being deleted, and thus prevent it from being deleted right away.
+		channelz.RemoveEntry(cc.channelzID)
+	}
+	return nil
+}
+
+// addrConn is a network connection to a given address.
+type addrConn struct {
+	ctx    context.Context
+	cancel context.CancelFunc
+
+	cc     *ClientConn
+	dopts  dialOptions
+	acbw   balancer.SubConn
+	scopts balancer.NewSubConnOptions
+
+	// transport is set when there's a viable transport (note: ac state may not be READY as LB channel
+	// health checking may require server to report healthy to set ac to READY), and is reset
+	// to nil when the current transport should no longer be used to create a stream (e.g. after GoAway
+	// is received, transport is closed, ac has been torn down).
+	transport transport.ClientTransport // The current transport.
+
+	mu      sync.Mutex
+	curAddr resolver.Address   // The current address.
+	addrs   []resolver.Address // All addresses that the resolver resolved to.
+
+	// Use updateConnectivityState for updating addrConn's connectivity state.
+	state connectivity.State
+
+	backoffIdx   int // Needs to be stateful for resetConnectBackoff.
+	resetBackoff chan struct{}
+
+	channelzID int64 // channelz unique identification number.
+	czData     *channelzData
+}
+
+// Note: this requires a lock on ac.mu.
+func (ac *addrConn) updateConnectivityState(s connectivity.State, lastErr error) {
+	if ac.state == s {
+		return
+	}
+
+	updateMsg := fmt.Sprintf("Subchannel Connectivity change to %v", s)
+	ac.state = s
+	if channelz.IsOn() {
+		channelz.AddTraceEvent(ac.channelzID, &channelz.TraceEventDesc{
+			Desc:     updateMsg,
+			Severity: channelz.CtINFO,
+		})
+	}
+	ac.cc.handleSubConnStateChange(ac.acbw, s, lastErr)
+}
+
+// adjustParams updates parameters used to create transports upon
+// receiving a GoAway.
+func (ac *addrConn) adjustParams(r transport.GoAwayReason) {
+	switch r {
+	case transport.GoAwayTooManyPings:
+		v := 2 * ac.dopts.copts.KeepaliveParams.Time
+		ac.cc.mu.Lock()
+		if v > ac.cc.mkp.Time {
+			ac.cc.mkp.Time = v
+		}
+		ac.cc.mu.Unlock()
+	}
+}
+
+func (ac *addrConn) resetTransport() {
+	for i := 0; ; i++ {
+		if i > 0 {
+			ac.cc.resolveNow(resolver.ResolveNowOptions{})
+		}
+
+		ac.mu.Lock()
+		if ac.state == connectivity.Shutdown {
+			ac.mu.Unlock()
+			return
+		}
+
+		addrs := ac.addrs
+		backoffFor := ac.dopts.bs.Backoff(ac.backoffIdx)
+		// This will be the duration that dial gets to finish.
+		dialDuration := minConnectTimeout
+		if ac.dopts.minConnectTimeout != nil {
+			dialDuration = ac.dopts.minConnectTimeout()
+		}
+
+		if dialDuration < backoffFor {
+			// Give dial more time as we keep failing to connect.
+			dialDuration = backoffFor
+		}
+		// We can potentially spend all the time trying the first address, and
+		// if the server accepts the connection and then hangs, the following
+		// addresses will never be tried.
+		//
+		// The spec doesn't mention what should be done for multiple addresses.
+		// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md#proposed-backoff-algorithm
+		connectDeadline := time.Now().Add(dialDuration)
+
+		ac.updateConnectivityState(connectivity.Connecting, nil)
+		ac.transport = nil
+		ac.mu.Unlock()
+
+		newTr, addr, reconnect, err := ac.tryAllAddrs(addrs, connectDeadline)
+		if err != nil {
+			// After exhausting all addresses, the addrConn enters
+			// TRANSIENT_FAILURE.
+			ac.mu.Lock()
+			if ac.state == connectivity.Shutdown {
+				ac.mu.Unlock()
+				return
+			}
+			ac.updateConnectivityState(connectivity.TransientFailure, err)
+
+			// Backoff.
+			b := ac.resetBackoff
+			ac.mu.Unlock()
+
+			timer := time.NewTimer(backoffFor)
+			select {
+			case <-timer.C:
+				ac.mu.Lock()
+				ac.backoffIdx++
+				ac.mu.Unlock()
+			case <-b:
+				timer.Stop()
+			case <-ac.ctx.Done():
+				timer.Stop()
+				return
+			}
+			continue
+		}
+
+		ac.mu.Lock()
+		if ac.state == connectivity.Shutdown {
+			ac.mu.Unlock()
+			newTr.Close()
+			return
+		}
+		ac.curAddr = addr
+		ac.transport = newTr
+		ac.backoffIdx = 0
+
+		hctx, hcancel := context.WithCancel(ac.ctx)
+		ac.startHealthCheck(hctx)
+		ac.mu.Unlock()
+
+		// Block until the created transport is down. And when this happens,
+		// we restart from the top of the addr list.
+		<-reconnect.Done()
+		hcancel()
+		// restart connecting - the top of the loop will set state to
+		// CONNECTING.  This is against the current connectivity semantics doc,
+		// however it allows for graceful behavior for RPCs not yet dispatched
+		// - unfortunate timing would otherwise lead to the RPC failing even
+		// though the TRANSIENT_FAILURE state (called for by the doc) would be
+		// instantaneous.
+		//
+		// Ideally we should transition to Idle here and block until there is
+		// RPC activity that leads to the balancer requesting a reconnect of
+		// the associated SubConn.
+	}
+}
+
+// tryAllAddrs tries to creates a connection to the addresses, and stop when at the
+// first successful one. It returns the transport, the address and a Event in
+// the successful case. The Event fires when the returned transport disconnects.
+func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.Time) (transport.ClientTransport, resolver.Address, *grpcsync.Event, error) {
+	var firstConnErr error
+	for _, addr := range addrs {
+		ac.mu.Lock()
+		if ac.state == connectivity.Shutdown {
+			ac.mu.Unlock()
+			return nil, resolver.Address{}, nil, errConnClosing
+		}
+
+		ac.cc.mu.RLock()
+		ac.dopts.copts.KeepaliveParams = ac.cc.mkp
+		ac.cc.mu.RUnlock()
+
+		copts := ac.dopts.copts
+		if ac.scopts.CredsBundle != nil {
+			copts.CredsBundle = ac.scopts.CredsBundle
+		}
+		ac.mu.Unlock()
+
+		if channelz.IsOn() {
+			channelz.AddTraceEvent(ac.channelzID, &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Subchannel picks a new address %q to connect", addr.Addr),
+				Severity: channelz.CtINFO,
+			})
+		}
+
+		newTr, reconnect, err := ac.createTransport(addr, copts, connectDeadline)
+		if err == nil {
+			return newTr, addr, reconnect, nil
+		}
+		if firstConnErr == nil {
+			firstConnErr = err
+		}
+		ac.cc.blockingpicker.updateConnectionError(err)
+	}
+
+	// Couldn't connect to any address.
+	return nil, resolver.Address{}, nil, firstConnErr
+}
+
+// createTransport creates a connection to addr. It returns the transport and a
+// Event in the successful case. The Event fires when the returned transport
+// disconnects.
+func (ac *addrConn) createTransport(addr resolver.Address, copts transport.ConnectOptions, connectDeadline time.Time) (transport.ClientTransport, *grpcsync.Event, error) {
+	prefaceReceived := make(chan struct{})
+	onCloseCalled := make(chan struct{})
+	reconnect := grpcsync.NewEvent()
+
+	authority := ac.cc.authority
+	// addr.ServerName takes precedent over ClientConn authority, if present.
+	if addr.ServerName != "" {
+		authority = addr.ServerName
+	}
+
+	target := transport.TargetInfo{
+		Addr:      addr.Addr,
+		Metadata:  addr.Metadata,
+		Authority: authority,
+	}
+
+	once := sync.Once{}
+	onGoAway := func(r transport.GoAwayReason) {
+		ac.mu.Lock()
+		ac.adjustParams(r)
+		once.Do(func() {
+			if ac.state == connectivity.Ready {
+				// Prevent this SubConn from being used for new RPCs by setting its
+				// state to Connecting.
+				//
+				// TODO: this should be Idle when grpc-go properly supports it.
+				ac.updateConnectivityState(connectivity.Connecting, nil)
+			}
+		})
+		ac.mu.Unlock()
+		reconnect.Fire()
+	}
+
+	onClose := func() {
+		ac.mu.Lock()
+		once.Do(func() {
+			if ac.state == connectivity.Ready {
+				// Prevent this SubConn from being used for new RPCs by setting its
+				// state to Connecting.
+				//
+				// TODO: this should be Idle when grpc-go properly supports it.
+				ac.updateConnectivityState(connectivity.Connecting, nil)
+			}
+		})
+		ac.mu.Unlock()
+		close(onCloseCalled)
+		reconnect.Fire()
+	}
+
+	onPrefaceReceipt := func() {
+		close(prefaceReceived)
+	}
+
+	connectCtx, cancel := context.WithDeadline(ac.ctx, connectDeadline)
+	defer cancel()
+	if channelz.IsOn() {
+		copts.ChannelzParentID = ac.channelzID
+	}
+
+	newTr, err := transport.NewClientTransport(connectCtx, ac.cc.ctx, target, copts, onPrefaceReceipt, onGoAway, onClose)
+	if err != nil {
+		// newTr is either nil, or closed.
+		grpclog.Warningf("grpc: addrConn.createTransport failed to connect to %v. Err :%v. Reconnecting...", addr, err)
+		return nil, nil, err
+	}
+
+	select {
+	case <-time.After(time.Until(connectDeadline)):
+		// We didn't get the preface in time.
+		newTr.Close()
+		grpclog.Warningf("grpc: addrConn.createTransport failed to connect to %v: didn't receive server preface in time. Reconnecting...", addr)
+		return nil, nil, errors.New("timed out waiting for server handshake")
+	case <-prefaceReceived:
+		// We got the preface - huzzah! things are good.
+	case <-onCloseCalled:
+		// The transport has already closed - noop.
+		return nil, nil, errors.New("connection closed")
+		// TODO(deklerk) this should bail on ac.ctx.Done(). Add a test and fix.
+	}
+	return newTr, reconnect, nil
+}
+
+// startHealthCheck starts the health checking stream (RPC) to watch the health
+// stats of this connection if health checking is requested and configured.
+//
+// LB channel health checking is enabled when all requirements below are met:
+// 1. it is not disabled by the user with the WithDisableHealthCheck DialOption
+// 2. internal.HealthCheckFunc is set by importing the grpc/healthcheck package
+// 3. a service config with non-empty healthCheckConfig field is provided
+// 4. the load balancer requests it
+//
+// It sets addrConn to READY if the health checking stream is not started.
+//
+// Caller must hold ac.mu.
+func (ac *addrConn) startHealthCheck(ctx context.Context) {
+	var healthcheckManagingState bool
+	defer func() {
+		if !healthcheckManagingState {
+			ac.updateConnectivityState(connectivity.Ready, nil)
+		}
+	}()
+
+	if ac.cc.dopts.disableHealthCheck {
+		return
+	}
+	healthCheckConfig := ac.cc.healthCheckConfig()
+	if healthCheckConfig == nil {
+		return
+	}
+	if !ac.scopts.HealthCheckEnabled {
+		return
+	}
+	healthCheckFunc := ac.cc.dopts.healthCheckFunc
+	if healthCheckFunc == nil {
+		// The health package is not imported to set health check function.
+		//
+		// TODO: add a link to the health check doc in the error message.
+		grpclog.Error("Health check is requested but health check function is not set.")
+		return
+	}
+
+	healthcheckManagingState = true
+
+	// Set up the health check helper functions.
+	currentTr := ac.transport
+	newStream := func(method string) (interface{}, error) {
+		ac.mu.Lock()
+		if ac.transport != currentTr {
+			ac.mu.Unlock()
+			return nil, status.Error(codes.Canceled, "the provided transport is no longer valid to use")
+		}
+		ac.mu.Unlock()
+		return newNonRetryClientStream(ctx, &StreamDesc{ServerStreams: true}, method, currentTr, ac)
+	}
+	setConnectivityState := func(s connectivity.State, lastErr error) {
+		ac.mu.Lock()
+		defer ac.mu.Unlock()
+		if ac.transport != currentTr {
+			return
+		}
+		ac.updateConnectivityState(s, lastErr)
+	}
+	// Start the health checking stream.
+	go func() {
+		err := ac.cc.dopts.healthCheckFunc(ctx, newStream, setConnectivityState, healthCheckConfig.ServiceName)
+		if err != nil {
+			if status.Code(err) == codes.Unimplemented {
+				if channelz.IsOn() {
+					channelz.AddTraceEvent(ac.channelzID, &channelz.TraceEventDesc{
+						Desc:     "Subchannel health check is unimplemented at server side, thus health check is disabled",
+						Severity: channelz.CtError,
+					})
+				}
+				grpclog.Error("Subchannel health check is unimplemented at server side, thus health check is disabled")
+			} else {
+				grpclog.Errorf("HealthCheckFunc exits with unexpected error %v", err)
+			}
+		}
+	}()
+}
+
+func (ac *addrConn) resetConnectBackoff() {
+	ac.mu.Lock()
+	close(ac.resetBackoff)
+	ac.backoffIdx = 0
+	ac.resetBackoff = make(chan struct{})
+	ac.mu.Unlock()
+}
+
+// getReadyTransport returns the transport if ac's state is READY.
+// Otherwise it returns nil, false.
+// If ac's state is IDLE, it will trigger ac to connect.
+func (ac *addrConn) getReadyTransport() (transport.ClientTransport, bool) {
+	ac.mu.Lock()
+	if ac.state == connectivity.Ready && ac.transport != nil {
+		t := ac.transport
+		ac.mu.Unlock()
+		return t, true
+	}
+	var idle bool
+	if ac.state == connectivity.Idle {
+		idle = true
+	}
+	ac.mu.Unlock()
+	// Trigger idle ac to connect.
+	if idle {
+		ac.connect()
+	}
+	return nil, false
+}
+
+// tearDown starts to tear down the addrConn.
+// TODO(zhaoq): Make this synchronous to avoid unbounded memory consumption in
+// some edge cases (e.g., the caller opens and closes many addrConn's in a
+// tight loop.
+// tearDown doesn't remove ac from ac.cc.conns.
+func (ac *addrConn) tearDown(err error) {
+	ac.mu.Lock()
+	if ac.state == connectivity.Shutdown {
+		ac.mu.Unlock()
+		return
+	}
+	curTr := ac.transport
+	ac.transport = nil
+	// We have to set the state to Shutdown before anything else to prevent races
+	// between setting the state and logic that waits on context cancellation / etc.
+	ac.updateConnectivityState(connectivity.Shutdown, nil)
+	ac.cancel()
+	ac.curAddr = resolver.Address{}
+	if err == errConnDrain && curTr != nil {
+		// GracefulClose(...) may be executed multiple times when
+		// i) receiving multiple GoAway frames from the server; or
+		// ii) there are concurrent name resolver/Balancer triggered
+		// address removal and GoAway.
+		// We have to unlock and re-lock here because GracefulClose => Close => onClose, which requires locking ac.mu.
+		ac.mu.Unlock()
+		curTr.GracefulClose()
+		ac.mu.Lock()
+	}
+	if channelz.IsOn() {
+		channelz.AddTraceEvent(ac.channelzID, &channelz.TraceEventDesc{
+			Desc:     "Subchannel Deleted",
+			Severity: channelz.CtINFO,
+			Parent: &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Subchanel(id:%d) deleted", ac.channelzID),
+				Severity: channelz.CtINFO,
+			},
+		})
+		// TraceEvent needs to be called before RemoveEntry, as TraceEvent may add trace reference to
+		// the entity being deleted, and thus prevent it from being deleted right away.
+		channelz.RemoveEntry(ac.channelzID)
+	}
+	ac.mu.Unlock()
+}
+
+func (ac *addrConn) getState() connectivity.State {
+	ac.mu.Lock()
+	defer ac.mu.Unlock()
+	return ac.state
+}
+
+func (ac *addrConn) ChannelzMetric() *channelz.ChannelInternalMetric {
+	ac.mu.Lock()
+	addr := ac.curAddr.Addr
+	ac.mu.Unlock()
+	return &channelz.ChannelInternalMetric{
+		State:                    ac.getState(),
+		Target:                   addr,
+		CallsStarted:             atomic.LoadInt64(&ac.czData.callsStarted),
+		CallsSucceeded:           atomic.LoadInt64(&ac.czData.callsSucceeded),
+		CallsFailed:              atomic.LoadInt64(&ac.czData.callsFailed),
+		LastCallStartedTimestamp: time.Unix(0, atomic.LoadInt64(&ac.czData.lastCallStartedTime)),
+	}
+}
+
+func (ac *addrConn) incrCallsStarted() {
+	atomic.AddInt64(&ac.czData.callsStarted, 1)
+	atomic.StoreInt64(&ac.czData.lastCallStartedTime, time.Now().UnixNano())
+}
+
+func (ac *addrConn) incrCallsSucceeded() {
+	atomic.AddInt64(&ac.czData.callsSucceeded, 1)
+}
+
+func (ac *addrConn) incrCallsFailed() {
+	atomic.AddInt64(&ac.czData.callsFailed, 1)
+}
+
+type retryThrottler struct {
+	max    float64
+	thresh float64
+	ratio  float64
+
+	mu     sync.Mutex
+	tokens float64 // TODO(dfawley): replace with atomic and remove lock.
+}
+
+// throttle subtracts a retry token from the pool and returns whether a retry
+// should be throttled (disallowed) based upon the retry throttling policy in
+// the service config.
+func (rt *retryThrottler) throttle() bool {
+	if rt == nil {
+		return false
+	}
+	rt.mu.Lock()
+	defer rt.mu.Unlock()
+	rt.tokens--
+	if rt.tokens < 0 {
+		rt.tokens = 0
+	}
+	return rt.tokens <= rt.thresh
+}
+
+func (rt *retryThrottler) successfulRPC() {
+	if rt == nil {
+		return
+	}
+	rt.mu.Lock()
+	defer rt.mu.Unlock()
+	rt.tokens += rt.ratio
+	if rt.tokens > rt.max {
+		rt.tokens = rt.max
+	}
+}
+
+type channelzChannel struct {
+	cc *ClientConn
+}
+
+func (c *channelzChannel) ChannelzMetric() *channelz.ChannelInternalMetric {
+	return c.cc.channelzMetric()
+}
+
+// ErrClientConnTimeout indicates that the ClientConn cannot establish the
+// underlying connections within the specified timeout.
+//
+// Deprecated: This error is never returned by grpc and should not be
+// referenced by users.
+var ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
diff --git a/vendor/google.golang.org/grpc/codec.go b/vendor/google.golang.org/grpc/codec.go
new file mode 100644
index 0000000..1297765
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codec.go
@@ -0,0 +1,50 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"google.golang.org/grpc/encoding"
+	_ "google.golang.org/grpc/encoding/proto" // to register the Codec for "proto"
+)
+
+// baseCodec contains the functionality of both Codec and encoding.Codec, but
+// omits the name/string, which vary between the two and are not needed for
+// anything besides the registry in the encoding package.
+type baseCodec interface {
+	Marshal(v interface{}) ([]byte, error)
+	Unmarshal(data []byte, v interface{}) error
+}
+
+var _ baseCodec = Codec(nil)
+var _ baseCodec = encoding.Codec(nil)
+
+// Codec defines the interface gRPC uses to encode and decode messages.
+// Note that implementations of this interface must be thread safe;
+// a Codec's methods can be called from concurrent goroutines.
+//
+// Deprecated: use encoding.Codec instead.
+type Codec interface {
+	// Marshal returns the wire format of v.
+	Marshal(v interface{}) ([]byte, error)
+	// Unmarshal parses the wire format into v.
+	Unmarshal(data []byte, v interface{}) error
+	// String returns the name of the Codec implementation.  This is unused by
+	// gRPC.
+	String() string
+}
diff --git a/vendor/google.golang.org/grpc/codegen.sh b/vendor/google.golang.org/grpc/codegen.sh
new file mode 100644
index 0000000..4cdc6ba
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codegen.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# This script serves as an example to demonstrate how to generate the gRPC-Go
+# interface and the related messages from .proto file.
+#
+# It assumes the installation of i) Google proto buffer compiler at
+# https://github.com/google/protobuf (after v2.6.1) and ii) the Go codegen
+# plugin at https://github.com/golang/protobuf (after 2015-02-20). If you have
+# not, please install them first.
+#
+# We recommend running this script at $GOPATH/src.
+#
+# If this is not what you need, feel free to make your own scripts. Again, this
+# script is for demonstration purpose.
+#
+proto=$1
+protoc --go_out=plugins=grpc:. $proto
diff --git a/vendor/google.golang.org/grpc/codes/code_string.go b/vendor/google.golang.org/grpc/codes/code_string.go
new file mode 100644
index 0000000..0b206a5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codes/code_string.go
@@ -0,0 +1,62 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package codes
+
+import "strconv"
+
+func (c Code) String() string {
+	switch c {
+	case OK:
+		return "OK"
+	case Canceled:
+		return "Canceled"
+	case Unknown:
+		return "Unknown"
+	case InvalidArgument:
+		return "InvalidArgument"
+	case DeadlineExceeded:
+		return "DeadlineExceeded"
+	case NotFound:
+		return "NotFound"
+	case AlreadyExists:
+		return "AlreadyExists"
+	case PermissionDenied:
+		return "PermissionDenied"
+	case ResourceExhausted:
+		return "ResourceExhausted"
+	case FailedPrecondition:
+		return "FailedPrecondition"
+	case Aborted:
+		return "Aborted"
+	case OutOfRange:
+		return "OutOfRange"
+	case Unimplemented:
+		return "Unimplemented"
+	case Internal:
+		return "Internal"
+	case Unavailable:
+		return "Unavailable"
+	case DataLoss:
+		return "DataLoss"
+	case Unauthenticated:
+		return "Unauthenticated"
+	default:
+		return "Code(" + strconv.FormatInt(int64(c), 10) + ")"
+	}
+}
diff --git a/vendor/google.golang.org/grpc/codes/codes.go b/vendor/google.golang.org/grpc/codes/codes.go
new file mode 100644
index 0000000..0273883
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codes/codes.go
@@ -0,0 +1,198 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package codes defines the canonical error codes used by gRPC. It is
+// consistent across various languages.
+package codes // import "google.golang.org/grpc/codes"
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// A Code is an unsigned 32-bit error code as defined in the gRPC spec.
+type Code uint32
+
+const (
+	// OK is returned on success.
+	OK Code = 0
+
+	// Canceled indicates the operation was canceled (typically by the caller).
+	Canceled Code = 1
+
+	// Unknown error. An example of where this error may be returned is
+	// if a Status value received from another address space belongs to
+	// an error-space that is not known in this address space. Also
+	// errors raised by APIs that do not return enough error information
+	// may be converted to this error.
+	Unknown Code = 2
+
+	// InvalidArgument indicates client specified an invalid argument.
+	// Note that this differs from FailedPrecondition. It indicates arguments
+	// that are problematic regardless of the state of the system
+	// (e.g., a malformed file name).
+	InvalidArgument Code = 3
+
+	// DeadlineExceeded means operation expired before completion.
+	// For operations that change the state of the system, this error may be
+	// returned even if the operation has completed successfully. For
+	// example, a successful response from a server could have been delayed
+	// long enough for the deadline to expire.
+	DeadlineExceeded Code = 4
+
+	// NotFound means some requested entity (e.g., file or directory) was
+	// not found.
+	NotFound Code = 5
+
+	// AlreadyExists means an attempt to create an entity failed because one
+	// already exists.
+	AlreadyExists Code = 6
+
+	// PermissionDenied indicates the caller does not have permission to
+	// execute the specified operation. It must not be used for rejections
+	// caused by exhausting some resource (use ResourceExhausted
+	// instead for those errors). It must not be
+	// used if the caller cannot be identified (use Unauthenticated
+	// instead for those errors).
+	PermissionDenied Code = 7
+
+	// ResourceExhausted indicates some resource has been exhausted, perhaps
+	// a per-user quota, or perhaps the entire file system is out of space.
+	ResourceExhausted Code = 8
+
+	// FailedPrecondition indicates operation was rejected because the
+	// system is not in a state required for the operation's execution.
+	// For example, directory to be deleted may be non-empty, an rmdir
+	// operation is applied to a non-directory, etc.
+	//
+	// A litmus test that may help a service implementor in deciding
+	// between FailedPrecondition, Aborted, and Unavailable:
+	//  (a) Use Unavailable if the client can retry just the failing call.
+	//  (b) Use Aborted if the client should retry at a higher-level
+	//      (e.g., restarting a read-modify-write sequence).
+	//  (c) Use FailedPrecondition if the client should not retry until
+	//      the system state has been explicitly fixed. E.g., if an "rmdir"
+	//      fails because the directory is non-empty, FailedPrecondition
+	//      should be returned since the client should not retry unless
+	//      they have first fixed up the directory by deleting files from it.
+	//  (d) Use FailedPrecondition if the client performs conditional
+	//      REST Get/Update/Delete on a resource and the resource on the
+	//      server does not match the condition. E.g., conflicting
+	//      read-modify-write on the same resource.
+	FailedPrecondition Code = 9
+
+	// Aborted indicates the operation was aborted, typically due to a
+	// concurrency issue like sequencer check failures, transaction aborts,
+	// etc.
+	//
+	// See litmus test above for deciding between FailedPrecondition,
+	// Aborted, and Unavailable.
+	Aborted Code = 10
+
+	// OutOfRange means operation was attempted past the valid range.
+	// E.g., seeking or reading past end of file.
+	//
+	// Unlike InvalidArgument, this error indicates a problem that may
+	// be fixed if the system state changes. For example, a 32-bit file
+	// system will generate InvalidArgument if asked to read at an
+	// offset that is not in the range [0,2^32-1], but it will generate
+	// OutOfRange if asked to read from an offset past the current
+	// file size.
+	//
+	// There is a fair bit of overlap between FailedPrecondition and
+	// OutOfRange. We recommend using OutOfRange (the more specific
+	// error) when it applies so that callers who are iterating through
+	// a space can easily look for an OutOfRange error to detect when
+	// they are done.
+	OutOfRange Code = 11
+
+	// Unimplemented indicates operation is not implemented or not
+	// supported/enabled in this service.
+	Unimplemented Code = 12
+
+	// Internal errors. Means some invariants expected by underlying
+	// system has been broken. If you see one of these errors,
+	// something is very broken.
+	Internal Code = 13
+
+	// Unavailable indicates the service is currently unavailable.
+	// This is a most likely a transient condition and may be corrected
+	// by retrying with a backoff. Note that it is not always safe to retry
+	// non-idempotent operations.
+	//
+	// See litmus test above for deciding between FailedPrecondition,
+	// Aborted, and Unavailable.
+	Unavailable Code = 14
+
+	// DataLoss indicates unrecoverable data loss or corruption.
+	DataLoss Code = 15
+
+	// Unauthenticated indicates the request does not have valid
+	// authentication credentials for the operation.
+	Unauthenticated Code = 16
+
+	_maxCode = 17
+)
+
+var strToCode = map[string]Code{
+	`"OK"`: OK,
+	`"CANCELLED"`:/* [sic] */ Canceled,
+	`"UNKNOWN"`:             Unknown,
+	`"INVALID_ARGUMENT"`:    InvalidArgument,
+	`"DEADLINE_EXCEEDED"`:   DeadlineExceeded,
+	`"NOT_FOUND"`:           NotFound,
+	`"ALREADY_EXISTS"`:      AlreadyExists,
+	`"PERMISSION_DENIED"`:   PermissionDenied,
+	`"RESOURCE_EXHAUSTED"`:  ResourceExhausted,
+	`"FAILED_PRECONDITION"`: FailedPrecondition,
+	`"ABORTED"`:             Aborted,
+	`"OUT_OF_RANGE"`:        OutOfRange,
+	`"UNIMPLEMENTED"`:       Unimplemented,
+	`"INTERNAL"`:            Internal,
+	`"UNAVAILABLE"`:         Unavailable,
+	`"DATA_LOSS"`:           DataLoss,
+	`"UNAUTHENTICATED"`:     Unauthenticated,
+}
+
+// UnmarshalJSON unmarshals b into the Code.
+func (c *Code) UnmarshalJSON(b []byte) error {
+	// From json.Unmarshaler: By convention, to approximate the behavior of
+	// Unmarshal itself, Unmarshalers implement UnmarshalJSON([]byte("null")) as
+	// a no-op.
+	if string(b) == "null" {
+		return nil
+	}
+	if c == nil {
+		return fmt.Errorf("nil receiver passed to UnmarshalJSON")
+	}
+
+	if ci, err := strconv.ParseUint(string(b), 10, 32); err == nil {
+		if ci >= _maxCode {
+			return fmt.Errorf("invalid code: %q", ci)
+		}
+
+		*c = Code(ci)
+		return nil
+	}
+
+	if jc, ok := strToCode[string(b)]; ok {
+		*c = jc
+		return nil
+	}
+	return fmt.Errorf("invalid code: %q", string(b))
+}
diff --git a/vendor/google.golang.org/grpc/connectivity/connectivity.go b/vendor/google.golang.org/grpc/connectivity/connectivity.go
new file mode 100644
index 0000000..34ec36f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/connectivity/connectivity.go
@@ -0,0 +1,73 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package connectivity defines connectivity semantics.
+// For details, see https://github.com/grpc/grpc/blob/master/doc/connectivity-semantics-and-api.md.
+// All APIs in this package are experimental.
+package connectivity
+
+import (
+	"context"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+// State indicates the state of connectivity.
+// It can be the state of a ClientConn or SubConn.
+type State int
+
+func (s State) String() string {
+	switch s {
+	case Idle:
+		return "IDLE"
+	case Connecting:
+		return "CONNECTING"
+	case Ready:
+		return "READY"
+	case TransientFailure:
+		return "TRANSIENT_FAILURE"
+	case Shutdown:
+		return "SHUTDOWN"
+	default:
+		grpclog.Errorf("unknown connectivity state: %d", s)
+		return "Invalid-State"
+	}
+}
+
+const (
+	// Idle indicates the ClientConn is idle.
+	Idle State = iota
+	// Connecting indicates the ClientConn is connecting.
+	Connecting
+	// Ready indicates the ClientConn is ready for work.
+	Ready
+	// TransientFailure indicates the ClientConn has seen a failure but expects to recover.
+	TransientFailure
+	// Shutdown indicates the ClientConn has started shutting down.
+	Shutdown
+)
+
+// Reporter reports the connectivity states.
+type Reporter interface {
+	// CurrentState returns the current state of the reporter.
+	CurrentState() State
+	// WaitForStateChange blocks until the reporter's state is different from the given state,
+	// and returns true.
+	// It returns false if <-ctx.Done() can proceed (ctx got timeout or got canceled).
+	WaitForStateChange(context.Context, State) bool
+}
diff --git a/vendor/google.golang.org/grpc/credentials/credentials.go b/vendor/google.golang.org/grpc/credentials/credentials.go
new file mode 100644
index 0000000..667cf6b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -0,0 +1,176 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package credentials implements various credentials supported by gRPC library,
+// which encapsulate all the state needed by a client to authenticate with a
+// server and make various assertions, e.g., about the client's identity, role,
+// or whether it is authorized to make a particular call.
+package credentials // import "google.golang.org/grpc/credentials"
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	"github.com/golang/protobuf/proto"
+	"google.golang.org/grpc/internal"
+)
+
+// PerRPCCredentials defines the common interface for the credentials which need to
+// attach security information to every RPC (e.g., oauth2).
+type PerRPCCredentials interface {
+	// GetRequestMetadata gets the current request metadata, refreshing
+	// tokens if required. This should be called by the transport layer on
+	// each request, and the data should be populated in headers or other
+	// context. If a status code is returned, it will be used as the status
+	// for the RPC. uri is the URI of the entry point for the request.
+	// When supported by the underlying implementation, ctx can be used for
+	// timeout and cancellation. Additionally, RequestInfo data will be
+	// available via ctx to this call.
+	// TODO(zhaoq): Define the set of the qualified keys instead of leaving
+	// it as an arbitrary string.
+	GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error)
+	// RequireTransportSecurity indicates whether the credentials requires
+	// transport security.
+	RequireTransportSecurity() bool
+}
+
+// ProtocolInfo provides information regarding the gRPC wire protocol version,
+// security protocol, security protocol version in use, server name, etc.
+type ProtocolInfo struct {
+	// ProtocolVersion is the gRPC wire protocol version.
+	ProtocolVersion string
+	// SecurityProtocol is the security protocol in use.
+	SecurityProtocol string
+	// SecurityVersion is the security protocol version.
+	SecurityVersion string
+	// ServerName is the user-configured server name.
+	ServerName string
+}
+
+// AuthInfo defines the common interface for the auth information the users are interested in.
+type AuthInfo interface {
+	AuthType() string
+}
+
+// ErrConnDispatched indicates that rawConn has been dispatched out of gRPC
+// and the caller should not close rawConn.
+var ErrConnDispatched = errors.New("credentials: rawConn is dispatched out of gRPC")
+
+// TransportCredentials defines the common interface for all the live gRPC wire
+// protocols and supported transport security protocols (e.g., TLS, SSL).
+type TransportCredentials interface {
+	// ClientHandshake does the authentication handshake specified by the corresponding
+	// authentication protocol on rawConn for clients. It returns the authenticated
+	// connection and the corresponding auth information about the connection.
+	// Implementations must use the provided context to implement timely cancellation.
+	// gRPC will try to reconnect if the error returned is a temporary error
+	// (io.EOF, context.DeadlineExceeded or err.Temporary() == true).
+	// If the returned error is a wrapper error, implementations should make sure that
+	// the error implements Temporary() to have the correct retry behaviors.
+	//
+	// If the returned net.Conn is closed, it MUST close the net.Conn provided.
+	ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
+	// ServerHandshake does the authentication handshake for servers. It returns
+	// the authenticated connection and the corresponding auth information about
+	// the connection.
+	//
+	// If the returned net.Conn is closed, it MUST close the net.Conn provided.
+	ServerHandshake(net.Conn) (net.Conn, AuthInfo, error)
+	// Info provides the ProtocolInfo of this TransportCredentials.
+	Info() ProtocolInfo
+	// Clone makes a copy of this TransportCredentials.
+	Clone() TransportCredentials
+	// OverrideServerName overrides the server name used to verify the hostname on the returned certificates from the server.
+	// gRPC internals also use it to override the virtual hosting name if it is set.
+	// It must be called before dialing. Currently, this is only used by grpclb.
+	OverrideServerName(string) error
+}
+
+// Bundle is a combination of TransportCredentials and PerRPCCredentials.
+//
+// It also contains a mode switching method, so it can be used as a combination
+// of different credential policies.
+//
+// Bundle cannot be used together with individual TransportCredentials.
+// PerRPCCredentials from Bundle will be appended to other PerRPCCredentials.
+//
+// This API is experimental.
+type Bundle interface {
+	TransportCredentials() TransportCredentials
+	PerRPCCredentials() PerRPCCredentials
+	// NewWithMode should make a copy of Bundle, and switch mode. Modifying the
+	// existing Bundle may cause races.
+	//
+	// NewWithMode returns nil if the requested mode is not supported.
+	NewWithMode(mode string) (Bundle, error)
+}
+
+// RequestInfo contains request data attached to the context passed to GetRequestMetadata calls.
+//
+// This API is experimental.
+type RequestInfo struct {
+	// The method passed to Invoke or NewStream for this RPC. (For proto methods, this has the format "/some.Service/Method")
+	Method string
+}
+
+// requestInfoKey is a struct to be used as the key when attaching a RequestInfo to a context object.
+type requestInfoKey struct{}
+
+// RequestInfoFromContext extracts the RequestInfo from the context if it exists.
+//
+// This API is experimental.
+func RequestInfoFromContext(ctx context.Context) (ri RequestInfo, ok bool) {
+	ri, ok = ctx.Value(requestInfoKey{}).(RequestInfo)
+	return
+}
+
+func init() {
+	internal.NewRequestInfoContext = func(ctx context.Context, ri RequestInfo) context.Context {
+		return context.WithValue(ctx, requestInfoKey{}, ri)
+	}
+}
+
+// ChannelzSecurityInfo defines the interface that security protocols should implement
+// in order to provide security info to channelz.
+//
+// This API is experimental.
+type ChannelzSecurityInfo interface {
+	GetSecurityValue() ChannelzSecurityValue
+}
+
+// ChannelzSecurityValue defines the interface that GetSecurityValue() return value
+// should satisfy. This interface should only be satisfied by *TLSChannelzSecurityValue
+// and *OtherChannelzSecurityValue.
+//
+// This API is experimental.
+type ChannelzSecurityValue interface {
+	isChannelzSecurityValue()
+}
+
+// OtherChannelzSecurityValue defines the struct that non-TLS protocol should return
+// from GetSecurityValue(), which contains protocol specific security info. Note
+// the Value field will be sent to users of channelz requesting channel info, and
+// thus sensitive info should better be avoided.
+//
+// This API is experimental.
+type OtherChannelzSecurityValue struct {
+	ChannelzSecurityValue
+	Name  string
+	Value proto.Message
+}
diff --git a/vendor/google.golang.org/grpc/credentials/go12.go b/vendor/google.golang.org/grpc/credentials/go12.go
new file mode 100644
index 0000000..ccbf35b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/go12.go
@@ -0,0 +1,30 @@
+// +build go1.12
+
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package credentials
+
+import "crypto/tls"
+
+// This init function adds cipher suite constants only defined in Go 1.12.
+func init() {
+	cipherSuiteLookup[tls.TLS_AES_128_GCM_SHA256] = "TLS_AES_128_GCM_SHA256"
+	cipherSuiteLookup[tls.TLS_AES_256_GCM_SHA384] = "TLS_AES_256_GCM_SHA384"
+	cipherSuiteLookup[tls.TLS_CHACHA20_POLY1305_SHA256] = "TLS_CHACHA20_POLY1305_SHA256"
+}
diff --git a/vendor/google.golang.org/grpc/credentials/internal/syscallconn.go b/vendor/google.golang.org/grpc/credentials/internal/syscallconn.go
new file mode 100644
index 0000000..2f4472b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/internal/syscallconn.go
@@ -0,0 +1,61 @@
+// +build !appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package internal contains credentials-internal code.
+package internal
+
+import (
+	"net"
+	"syscall"
+)
+
+type sysConn = syscall.Conn
+
+// syscallConn keeps reference of rawConn to support syscall.Conn for channelz.
+// SyscallConn() (the method in interface syscall.Conn) is explicitly
+// implemented on this type,
+//
+// Interface syscall.Conn is implemented by most net.Conn implementations (e.g.
+// TCPConn, UnixConn), but is not part of net.Conn interface. So wrapper conns
+// that embed net.Conn don't implement syscall.Conn. (Side note: tls.Conn
+// doesn't embed net.Conn, so even if syscall.Conn is part of net.Conn, it won't
+// help here).
+type syscallConn struct {
+	net.Conn
+	// sysConn is a type alias of syscall.Conn. It's necessary because the name
+	// `Conn` collides with `net.Conn`.
+	sysConn
+}
+
+// WrapSyscallConn tries to wrap rawConn and newConn into a net.Conn that
+// implements syscall.Conn. rawConn will be used to support syscall, and newConn
+// will be used for read/write.
+//
+// This function returns newConn if rawConn doesn't implement syscall.Conn.
+func WrapSyscallConn(rawConn, newConn net.Conn) net.Conn {
+	sysConn, ok := rawConn.(syscall.Conn)
+	if !ok {
+		return newConn
+	}
+	return &syscallConn{
+		Conn:    newConn,
+		sysConn: sysConn,
+	}
+}
diff --git a/vendor/google.golang.org/grpc/credentials/internal/syscallconn_appengine.go b/vendor/google.golang.org/grpc/credentials/internal/syscallconn_appengine.go
new file mode 100644
index 0000000..d4346e9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/internal/syscallconn_appengine.go
@@ -0,0 +1,30 @@
+// +build appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package internal
+
+import (
+	"net"
+)
+
+// WrapSyscallConn returns newConn on appengine.
+func WrapSyscallConn(rawConn, newConn net.Conn) net.Conn {
+	return newConn
+}
diff --git a/vendor/google.golang.org/grpc/credentials/tls.go b/vendor/google.golang.org/grpc/credentials/tls.go
new file mode 100644
index 0000000..7c33613
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/tls.go
@@ -0,0 +1,220 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package credentials
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net"
+
+	"google.golang.org/grpc/credentials/internal"
+)
+
+// TLSInfo contains the auth information for a TLS authenticated connection.
+// It implements the AuthInfo interface.
+type TLSInfo struct {
+	State tls.ConnectionState
+}
+
+// AuthType returns the type of TLSInfo as a string.
+func (t TLSInfo) AuthType() string {
+	return "tls"
+}
+
+// GetSecurityValue returns security info requested by channelz.
+func (t TLSInfo) GetSecurityValue() ChannelzSecurityValue {
+	v := &TLSChannelzSecurityValue{
+		StandardName: cipherSuiteLookup[t.State.CipherSuite],
+	}
+	// Currently there's no way to get LocalCertificate info from tls package.
+	if len(t.State.PeerCertificates) > 0 {
+		v.RemoteCertificate = t.State.PeerCertificates[0].Raw
+	}
+	return v
+}
+
+// tlsCreds is the credentials required for authenticating a connection using TLS.
+type tlsCreds struct {
+	// TLS configuration
+	config *tls.Config
+}
+
+func (c tlsCreds) Info() ProtocolInfo {
+	return ProtocolInfo{
+		SecurityProtocol: "tls",
+		SecurityVersion:  "1.2",
+		ServerName:       c.config.ServerName,
+	}
+}
+
+func (c *tlsCreds) ClientHandshake(ctx context.Context, authority string, rawConn net.Conn) (_ net.Conn, _ AuthInfo, err error) {
+	// use local cfg to avoid clobbering ServerName if using multiple endpoints
+	cfg := cloneTLSConfig(c.config)
+	if cfg.ServerName == "" {
+		serverName, _, err := net.SplitHostPort(authority)
+		if err != nil {
+			// If the authority had no host port or if the authority cannot be parsed, use it as-is.
+			serverName = authority
+		}
+		cfg.ServerName = serverName
+	}
+	conn := tls.Client(rawConn, cfg)
+	errChannel := make(chan error, 1)
+	go func() {
+		errChannel <- conn.Handshake()
+	}()
+	select {
+	case err := <-errChannel:
+		if err != nil {
+			return nil, nil, err
+		}
+	case <-ctx.Done():
+		return nil, nil, ctx.Err()
+	}
+	return internal.WrapSyscallConn(rawConn, conn), TLSInfo{conn.ConnectionState()}, nil
+}
+
+func (c *tlsCreds) ServerHandshake(rawConn net.Conn) (net.Conn, AuthInfo, error) {
+	conn := tls.Server(rawConn, c.config)
+	if err := conn.Handshake(); err != nil {
+		return nil, nil, err
+	}
+	return internal.WrapSyscallConn(rawConn, conn), TLSInfo{conn.ConnectionState()}, nil
+}
+
+func (c *tlsCreds) Clone() TransportCredentials {
+	return NewTLS(c.config)
+}
+
+func (c *tlsCreds) OverrideServerName(serverNameOverride string) error {
+	c.config.ServerName = serverNameOverride
+	return nil
+}
+
+const alpnProtoStrH2 = "h2"
+
+func appendH2ToNextProtos(ps []string) []string {
+	for _, p := range ps {
+		if p == alpnProtoStrH2 {
+			return ps
+		}
+	}
+	ret := make([]string, 0, len(ps)+1)
+	ret = append(ret, ps...)
+	return append(ret, alpnProtoStrH2)
+}
+
+// NewTLS uses c to construct a TransportCredentials based on TLS.
+func NewTLS(c *tls.Config) TransportCredentials {
+	tc := &tlsCreds{cloneTLSConfig(c)}
+	tc.config.NextProtos = appendH2ToNextProtos(tc.config.NextProtos)
+	return tc
+}
+
+// NewClientTLSFromCert constructs TLS credentials from the input certificate for client.
+// serverNameOverride is for testing only. If set to a non empty string,
+// it will override the virtual host name of authority (e.g. :authority header field) in requests.
+func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) TransportCredentials {
+	return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp})
+}
+
+// NewClientTLSFromFile constructs TLS credentials from the input certificate file for client.
+// serverNameOverride is for testing only. If set to a non empty string,
+// it will override the virtual host name of authority (e.g. :authority header field) in requests.
+func NewClientTLSFromFile(certFile, serverNameOverride string) (TransportCredentials, error) {
+	b, err := ioutil.ReadFile(certFile)
+	if err != nil {
+		return nil, err
+	}
+	cp := x509.NewCertPool()
+	if !cp.AppendCertsFromPEM(b) {
+		return nil, fmt.Errorf("credentials: failed to append certificates")
+	}
+	return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp}), nil
+}
+
+// NewServerTLSFromCert constructs TLS credentials from the input certificate for server.
+func NewServerTLSFromCert(cert *tls.Certificate) TransportCredentials {
+	return NewTLS(&tls.Config{Certificates: []tls.Certificate{*cert}})
+}
+
+// NewServerTLSFromFile constructs TLS credentials from the input certificate file and key
+// file for server.
+func NewServerTLSFromFile(certFile, keyFile string) (TransportCredentials, error) {
+	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		return nil, err
+	}
+	return NewTLS(&tls.Config{Certificates: []tls.Certificate{cert}}), nil
+}
+
+// TLSChannelzSecurityValue defines the struct that TLS protocol should return
+// from GetSecurityValue(), containing security info like cipher and certificate used.
+//
+// This API is EXPERIMENTAL.
+type TLSChannelzSecurityValue struct {
+	ChannelzSecurityValue
+	StandardName      string
+	LocalCertificate  []byte
+	RemoteCertificate []byte
+}
+
+var cipherSuiteLookup = map[uint16]string{
+	tls.TLS_RSA_WITH_RC4_128_SHA:                "TLS_RSA_WITH_RC4_128_SHA",
+	tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA:           "TLS_RSA_WITH_3DES_EDE_CBC_SHA",
+	tls.TLS_RSA_WITH_AES_128_CBC_SHA:            "TLS_RSA_WITH_AES_128_CBC_SHA",
+	tls.TLS_RSA_WITH_AES_256_CBC_SHA:            "TLS_RSA_WITH_AES_256_CBC_SHA",
+	tls.TLS_RSA_WITH_AES_128_GCM_SHA256:         "TLS_RSA_WITH_AES_128_GCM_SHA256",
+	tls.TLS_RSA_WITH_AES_256_GCM_SHA384:         "TLS_RSA_WITH_AES_256_GCM_SHA384",
+	tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA:        "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
+	tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA:    "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
+	tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA:    "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
+	tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA:          "TLS_ECDHE_RSA_WITH_RC4_128_SHA",
+	tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA:     "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
+	tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:      "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
+	tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:      "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
+	tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:   "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
+	tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256: "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
+	tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:   "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
+	tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384: "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
+	tls.TLS_FALLBACK_SCSV:                       "TLS_FALLBACK_SCSV",
+	tls.TLS_RSA_WITH_AES_128_CBC_SHA256:         "TLS_RSA_WITH_AES_128_CBC_SHA256",
+	tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256: "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
+	tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:   "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
+	tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305:    "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
+	tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305:  "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
+}
+
+// cloneTLSConfig returns a shallow clone of the exported
+// fields of cfg, ignoring the unexported sync.Once, which
+// contains a mutex and must not be copied.
+//
+// If cfg is nil, a new zero tls.Config is returned.
+//
+// TODO: inline this function if possible.
+func cloneTLSConfig(cfg *tls.Config) *tls.Config {
+	if cfg == nil {
+		return &tls.Config{}
+	}
+
+	return cfg.Clone()
+}
diff --git a/vendor/google.golang.org/grpc/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
new file mode 100644
index 0000000..9af3eef
--- /dev/null
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -0,0 +1,591 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"time"
+
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
+	internalbackoff "google.golang.org/grpc/internal/backoff"
+	"google.golang.org/grpc/internal/envconfig"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/stats"
+)
+
+// dialOptions configure a Dial call. dialOptions are set by the DialOption
+// values passed to Dial.
+type dialOptions struct {
+	unaryInt  UnaryClientInterceptor
+	streamInt StreamClientInterceptor
+
+	chainUnaryInts  []UnaryClientInterceptor
+	chainStreamInts []StreamClientInterceptor
+
+	cp          Compressor
+	dc          Decompressor
+	bs          internalbackoff.Strategy
+	block       bool
+	insecure    bool
+	timeout     time.Duration
+	scChan      <-chan ServiceConfig
+	authority   string
+	copts       transport.ConnectOptions
+	callOptions []CallOption
+	// This is used by v1 balancer dial option WithBalancer to support v1
+	// balancer, and also by WithBalancerName dial option.
+	balancerBuilder balancer.Builder
+	// This is to support grpclb.
+	resolverBuilder             resolver.Builder
+	channelzParentID            int64
+	disableServiceConfig        bool
+	disableRetry                bool
+	disableHealthCheck          bool
+	healthCheckFunc             internal.HealthChecker
+	minConnectTimeout           func() time.Duration
+	defaultServiceConfig        *ServiceConfig // defaultServiceConfig is parsed from defaultServiceConfigRawJSON.
+	defaultServiceConfigRawJSON *string
+	// This is used by ccResolverWrapper to backoff between successive calls to
+	// resolver.ResolveNow(). The user will have no need to configure this, but
+	// we need to be able to configure this in tests.
+	resolveNowBackoff func(int) time.Duration
+}
+
+// DialOption configures how we set up the connection.
+type DialOption interface {
+	apply(*dialOptions)
+}
+
+// EmptyDialOption does not alter the dial configuration. It can be embedded in
+// another structure to build custom dial options.
+//
+// This API is EXPERIMENTAL.
+type EmptyDialOption struct{}
+
+func (EmptyDialOption) apply(*dialOptions) {}
+
+// funcDialOption wraps a function that modifies dialOptions into an
+// implementation of the DialOption interface.
+type funcDialOption struct {
+	f func(*dialOptions)
+}
+
+func (fdo *funcDialOption) apply(do *dialOptions) {
+	fdo.f(do)
+}
+
+func newFuncDialOption(f func(*dialOptions)) *funcDialOption {
+	return &funcDialOption{
+		f: f,
+	}
+}
+
+// WithWriteBufferSize determines how much data can be batched before doing a
+// write on the wire. The corresponding memory allocation for this buffer will
+// be twice the size to keep syscalls low. The default value for this buffer is
+// 32KB.
+//
+// Zero will disable the write buffer such that each write will be on underlying
+// connection. Note: A Send call may not directly translate to a write.
+func WithWriteBufferSize(s int) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.WriteBufferSize = s
+	})
+}
+
+// WithReadBufferSize lets you set the size of read buffer, this determines how
+// much data can be read at most for each read syscall.
+//
+// The default value for this buffer is 32KB. Zero will disable read buffer for
+// a connection so data framer can access the underlying conn directly.
+func WithReadBufferSize(s int) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.ReadBufferSize = s
+	})
+}
+
+// WithInitialWindowSize returns a DialOption which sets the value for initial
+// window size on a stream. The lower bound for window size is 64K and any value
+// smaller than that will be ignored.
+func WithInitialWindowSize(s int32) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.InitialWindowSize = s
+	})
+}
+
+// WithInitialConnWindowSize returns a DialOption which sets the value for
+// initial window size on a connection. The lower bound for window size is 64K
+// and any value smaller than that will be ignored.
+func WithInitialConnWindowSize(s int32) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.InitialConnWindowSize = s
+	})
+}
+
+// WithMaxMsgSize returns a DialOption which sets the maximum message size the
+// client can receive.
+//
+// Deprecated: use WithDefaultCallOptions(MaxCallRecvMsgSize(s)) instead.  Will
+// be supported throughout 1.x.
+func WithMaxMsgSize(s int) DialOption {
+	return WithDefaultCallOptions(MaxCallRecvMsgSize(s))
+}
+
+// WithDefaultCallOptions returns a DialOption which sets the default
+// CallOptions for calls over the connection.
+func WithDefaultCallOptions(cos ...CallOption) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.callOptions = append(o.callOptions, cos...)
+	})
+}
+
+// WithCodec returns a DialOption which sets a codec for message marshaling and
+// unmarshaling.
+//
+// Deprecated: use WithDefaultCallOptions(ForceCodec(_)) instead.  Will be
+// supported throughout 1.x.
+func WithCodec(c Codec) DialOption {
+	return WithDefaultCallOptions(CallCustomCodec(c))
+}
+
+// WithCompressor returns a DialOption which sets a Compressor to use for
+// message compression. It has lower priority than the compressor set by the
+// UseCompressor CallOption.
+//
+// Deprecated: use UseCompressor instead.  Will be supported throughout 1.x.
+func WithCompressor(cp Compressor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.cp = cp
+	})
+}
+
+// WithDecompressor returns a DialOption which sets a Decompressor to use for
+// incoming message decompression.  If incoming response messages are encoded
+// using the decompressor's Type(), it will be used.  Otherwise, the message
+// encoding will be used to look up the compressor registered via
+// encoding.RegisterCompressor, which will then be used to decompress the
+// message.  If no compressor is registered for the encoding, an Unimplemented
+// status error will be returned.
+//
+// Deprecated: use encoding.RegisterCompressor instead.  Will be supported
+// throughout 1.x.
+func WithDecompressor(dc Decompressor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.dc = dc
+	})
+}
+
+// WithBalancer returns a DialOption which sets a load balancer with the v1 API.
+// Name resolver will be ignored if this DialOption is specified.
+//
+// Deprecated: use the new balancer APIs in balancer package and
+// WithBalancerName.  Will be removed in a future 1.x release.
+func WithBalancer(b Balancer) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.balancerBuilder = &balancerWrapperBuilder{
+			b: b,
+		}
+	})
+}
+
+// WithBalancerName sets the balancer that the ClientConn will be initialized
+// with. Balancer registered with balancerName will be used. This function
+// panics if no balancer was registered by balancerName.
+//
+// The balancer cannot be overridden by balancer option specified by service
+// config.
+//
+// Deprecated: use WithDefaultServiceConfig and WithDisableServiceConfig
+// instead.  Will be removed in a future 1.x release.
+func WithBalancerName(balancerName string) DialOption {
+	builder := balancer.Get(balancerName)
+	if builder == nil {
+		panic(fmt.Sprintf("grpc.WithBalancerName: no balancer is registered for name %v", balancerName))
+	}
+	return newFuncDialOption(func(o *dialOptions) {
+		o.balancerBuilder = builder
+	})
+}
+
+// withResolverBuilder is only for grpclb.
+func withResolverBuilder(b resolver.Builder) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.resolverBuilder = b
+	})
+}
+
+// WithServiceConfig returns a DialOption which has a channel to read the
+// service configuration.
+//
+// Deprecated: service config should be received through name resolver or via
+// WithDefaultServiceConfig, as specified at
+// https://github.com/grpc/grpc/blob/master/doc/service_config.md.  Will be
+// removed in a future 1.x release.
+func WithServiceConfig(c <-chan ServiceConfig) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.scChan = c
+	})
+}
+
+// WithConnectParams configures the dialer to use the provided ConnectParams.
+//
+// The backoff configuration specified as part of the ConnectParams overrides
+// all defaults specified in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md. Consider
+// using the backoff.DefaultConfig as a base, in cases where you want to
+// override only a subset of the backoff configuration.
+//
+// This API is EXPERIMENTAL.
+func WithConnectParams(p ConnectParams) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.bs = internalbackoff.Exponential{Config: p.Backoff}
+		o.minConnectTimeout = func() time.Duration {
+			return p.MinConnectTimeout
+		}
+	})
+}
+
+// WithBackoffMaxDelay configures the dialer to use the provided maximum delay
+// when backing off after failed connection attempts.
+//
+// Deprecated: use WithConnectParams instead. Will be supported throughout 1.x.
+func WithBackoffMaxDelay(md time.Duration) DialOption {
+	return WithBackoffConfig(BackoffConfig{MaxDelay: md})
+}
+
+// WithBackoffConfig configures the dialer to use the provided backoff
+// parameters after connection failures.
+//
+// Deprecated: use WithConnectParams instead. Will be supported throughout 1.x.
+func WithBackoffConfig(b BackoffConfig) DialOption {
+	bc := backoff.DefaultConfig
+	bc.MaxDelay = b.MaxDelay
+	return withBackoff(internalbackoff.Exponential{Config: bc})
+}
+
+// withBackoff sets the backoff strategy used for connectRetryNum after a failed
+// connection attempt.
+//
+// This can be exported if arbitrary backoff strategies are allowed by gRPC.
+func withBackoff(bs internalbackoff.Strategy) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.bs = bs
+	})
+}
+
+// WithBlock returns a DialOption which makes caller of Dial blocks until the
+// underlying connection is up. Without this, Dial returns immediately and
+// connecting the server happens in background.
+func WithBlock() DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.block = true
+	})
+}
+
+// WithInsecure returns a DialOption which disables transport security for this
+// ClientConn. Note that transport security is required unless WithInsecure is
+// set.
+func WithInsecure() DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.insecure = true
+	})
+}
+
+// WithTransportCredentials returns a DialOption which configures a connection
+// level security credentials (e.g., TLS/SSL). This should not be used together
+// with WithCredentialsBundle.
+func WithTransportCredentials(creds credentials.TransportCredentials) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.TransportCredentials = creds
+	})
+}
+
+// WithPerRPCCredentials returns a DialOption which sets credentials and places
+// auth state on each outbound RPC.
+func WithPerRPCCredentials(creds credentials.PerRPCCredentials) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.PerRPCCredentials = append(o.copts.PerRPCCredentials, creds)
+	})
+}
+
+// WithCredentialsBundle returns a DialOption to set a credentials bundle for
+// the ClientConn.WithCreds. This should not be used together with
+// WithTransportCredentials.
+//
+// This API is experimental.
+func WithCredentialsBundle(b credentials.Bundle) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.CredsBundle = b
+	})
+}
+
+// WithTimeout returns a DialOption that configures a timeout for dialing a
+// ClientConn initially. This is valid if and only if WithBlock() is present.
+//
+// Deprecated: use DialContext instead of Dial and context.WithTimeout
+// instead.  Will be supported throughout 1.x.
+func WithTimeout(d time.Duration) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.timeout = d
+	})
+}
+
+// WithContextDialer returns a DialOption that sets a dialer to create
+// connections. If FailOnNonTempDialError() is set to true, and an error is
+// returned by f, gRPC checks the error's Temporary() method to decide if it
+// should try to reconnect to the network address.
+func WithContextDialer(f func(context.Context, string) (net.Conn, error)) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.Dialer = f
+	})
+}
+
+func init() {
+	internal.WithResolverBuilder = withResolverBuilder
+	internal.WithHealthCheckFunc = withHealthCheckFunc
+}
+
+// WithDialer returns a DialOption that specifies a function to use for dialing
+// network addresses. If FailOnNonTempDialError() is set to true, and an error
+// is returned by f, gRPC checks the error's Temporary() method to decide if it
+// should try to reconnect to the network address.
+//
+// Deprecated: use WithContextDialer instead.  Will be supported throughout
+// 1.x.
+func WithDialer(f func(string, time.Duration) (net.Conn, error)) DialOption {
+	return WithContextDialer(
+		func(ctx context.Context, addr string) (net.Conn, error) {
+			if deadline, ok := ctx.Deadline(); ok {
+				return f(addr, time.Until(deadline))
+			}
+			return f(addr, 0)
+		})
+}
+
+// WithStatsHandler returns a DialOption that specifies the stats handler for
+// all the RPCs and underlying network connections in this ClientConn.
+func WithStatsHandler(h stats.Handler) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.StatsHandler = h
+	})
+}
+
+// FailOnNonTempDialError returns a DialOption that specifies if gRPC fails on
+// non-temporary dial errors. If f is true, and dialer returns a non-temporary
+// error, gRPC will fail the connection to the network address and won't try to
+// reconnect. The default value of FailOnNonTempDialError is false.
+//
+// FailOnNonTempDialError only affects the initial dial, and does not do
+// anything useful unless you are also using WithBlock().
+//
+// This is an EXPERIMENTAL API.
+func FailOnNonTempDialError(f bool) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.FailOnNonTempDialError = f
+	})
+}
+
+// WithUserAgent returns a DialOption that specifies a user agent string for all
+// the RPCs.
+func WithUserAgent(s string) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.UserAgent = s
+	})
+}
+
+// WithKeepaliveParams returns a DialOption that specifies keepalive parameters
+// for the client transport.
+func WithKeepaliveParams(kp keepalive.ClientParameters) DialOption {
+	if kp.Time < internal.KeepaliveMinPingTime {
+		grpclog.Warningf("Adjusting keepalive ping interval to minimum period of %v", internal.KeepaliveMinPingTime)
+		kp.Time = internal.KeepaliveMinPingTime
+	}
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.KeepaliveParams = kp
+	})
+}
+
+// WithUnaryInterceptor returns a DialOption that specifies the interceptor for
+// unary RPCs.
+func WithUnaryInterceptor(f UnaryClientInterceptor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.unaryInt = f
+	})
+}
+
+// WithChainUnaryInterceptor returns a DialOption that specifies the chained
+// interceptor for unary RPCs. The first interceptor will be the outer most,
+// while the last interceptor will be the inner most wrapper around the real call.
+// All interceptors added by this method will be chained, and the interceptor
+// defined by WithUnaryInterceptor will always be prepended to the chain.
+func WithChainUnaryInterceptor(interceptors ...UnaryClientInterceptor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.chainUnaryInts = append(o.chainUnaryInts, interceptors...)
+	})
+}
+
+// WithStreamInterceptor returns a DialOption that specifies the interceptor for
+// streaming RPCs.
+func WithStreamInterceptor(f StreamClientInterceptor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.streamInt = f
+	})
+}
+
+// WithChainStreamInterceptor returns a DialOption that specifies the chained
+// interceptor for unary RPCs. The first interceptor will be the outer most,
+// while the last interceptor will be the inner most wrapper around the real call.
+// All interceptors added by this method will be chained, and the interceptor
+// defined by WithStreamInterceptor will always be prepended to the chain.
+func WithChainStreamInterceptor(interceptors ...StreamClientInterceptor) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.chainStreamInts = append(o.chainStreamInts, interceptors...)
+	})
+}
+
+// WithAuthority returns a DialOption that specifies the value to be used as the
+// :authority pseudo-header. This value only works with WithInsecure and has no
+// effect if TransportCredentials are present.
+func WithAuthority(a string) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.authority = a
+	})
+}
+
+// WithChannelzParentID returns a DialOption that specifies the channelz ID of
+// current ClientConn's parent. This function is used in nested channel creation
+// (e.g. grpclb dial).
+//
+// This API is EXPERIMENTAL.
+func WithChannelzParentID(id int64) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.channelzParentID = id
+	})
+}
+
+// WithDisableServiceConfig returns a DialOption that causes gRPC to ignore any
+// service config provided by the resolver and provides a hint to the resolver
+// to not fetch service configs.
+//
+// Note that this dial option only disables service config from resolver. If
+// default service config is provided, gRPC will use the default service config.
+func WithDisableServiceConfig() DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.disableServiceConfig = true
+	})
+}
+
+// WithDefaultServiceConfig returns a DialOption that configures the default
+// service config, which will be used in cases where:
+//
+// 1. WithDisableServiceConfig is also used.
+// 2. Resolver does not return a service config or if the resolver returns an
+//    invalid service config.
+//
+// This API is EXPERIMENTAL.
+func WithDefaultServiceConfig(s string) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.defaultServiceConfigRawJSON = &s
+	})
+}
+
+// WithDisableRetry returns a DialOption that disables retries, even if the
+// service config enables them.  This does not impact transparent retries, which
+// will happen automatically if no data is written to the wire or if the RPC is
+// unprocessed by the remote server.
+//
+// Retry support is currently disabled by default, but will be enabled by
+// default in the future.  Until then, it may be enabled by setting the
+// environment variable "GRPC_GO_RETRY" to "on".
+//
+// This API is EXPERIMENTAL.
+func WithDisableRetry() DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.disableRetry = true
+	})
+}
+
+// WithMaxHeaderListSize returns a DialOption that specifies the maximum
+// (uncompressed) size of header list that the client is prepared to accept.
+func WithMaxHeaderListSize(s uint32) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.MaxHeaderListSize = &s
+	})
+}
+
+// WithDisableHealthCheck disables the LB channel health checking for all
+// SubConns of this ClientConn.
+//
+// This API is EXPERIMENTAL.
+func WithDisableHealthCheck() DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.disableHealthCheck = true
+	})
+}
+
+// withHealthCheckFunc replaces the default health check function with the
+// provided one. It makes tests easier to change the health check function.
+//
+// For testing purpose only.
+func withHealthCheckFunc(f internal.HealthChecker) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.healthCheckFunc = f
+	})
+}
+
+func defaultDialOptions() dialOptions {
+	return dialOptions{
+		disableRetry:    !envconfig.Retry,
+		healthCheckFunc: internal.HealthCheckFunc,
+		copts: transport.ConnectOptions{
+			WriteBufferSize: defaultWriteBufSize,
+			ReadBufferSize:  defaultReadBufSize,
+		},
+		resolveNowBackoff: internalbackoff.DefaultExponential.Backoff,
+	}
+}
+
+// withGetMinConnectDeadline specifies the function that clientconn uses to
+// get minConnectDeadline. This can be used to make connection attempts happen
+// faster/slower.
+//
+// For testing purpose only.
+func withMinConnectDeadline(f func() time.Duration) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.minConnectTimeout = f
+	})
+}
+
+// withResolveNowBackoff specifies the function that clientconn uses to backoff
+// between successive calls to resolver.ResolveNow().
+//
+// For testing purpose only.
+func withResolveNowBackoff(f func(int) time.Duration) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.resolveNowBackoff = f
+	})
+}
diff --git a/vendor/google.golang.org/grpc/doc.go b/vendor/google.golang.org/grpc/doc.go
new file mode 100644
index 0000000..187adbb
--- /dev/null
+++ b/vendor/google.golang.org/grpc/doc.go
@@ -0,0 +1,24 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/*
+Package grpc implements an RPC system called gRPC.
+
+See grpc.io for more information about gRPC.
+*/
+package grpc // import "google.golang.org/grpc"
diff --git a/vendor/google.golang.org/grpc/encoding/encoding.go b/vendor/google.golang.org/grpc/encoding/encoding.go
new file mode 100644
index 0000000..195e844
--- /dev/null
+++ b/vendor/google.golang.org/grpc/encoding/encoding.go
@@ -0,0 +1,122 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package encoding defines the interface for the compressor and codec, and
+// functions to register and retrieve compressors and codecs.
+//
+// This package is EXPERIMENTAL.
+package encoding
+
+import (
+	"io"
+	"strings"
+)
+
+// Identity specifies the optional encoding for uncompressed streams.
+// It is intended for grpc internal use only.
+const Identity = "identity"
+
+// Compressor is used for compressing and decompressing when sending or
+// receiving messages.
+type Compressor interface {
+	// Compress writes the data written to wc to w after compressing it.  If an
+	// error occurs while initializing the compressor, that error is returned
+	// instead.
+	Compress(w io.Writer) (io.WriteCloser, error)
+	// Decompress reads data from r, decompresses it, and provides the
+	// uncompressed data via the returned io.Reader.  If an error occurs while
+	// initializing the decompressor, that error is returned instead.
+	Decompress(r io.Reader) (io.Reader, error)
+	// Name is the name of the compression codec and is used to set the content
+	// coding header.  The result must be static; the result cannot change
+	// between calls.
+	Name() string
+	// EXPERIMENTAL: if a Compressor implements
+	// DecompressedSize(compressedBytes []byte) int, gRPC will call it
+	// to determine the size of the buffer allocated for the result of decompression.
+	// Return -1 to indicate unknown size.
+}
+
+var registeredCompressor = make(map[string]Compressor)
+
+// RegisterCompressor registers the compressor with gRPC by its name.  It can
+// be activated when sending an RPC via grpc.UseCompressor().  It will be
+// automatically accessed when receiving a message based on the content coding
+// header.  Servers also use it to send a response with the same encoding as
+// the request.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe.  If multiple Compressors are
+// registered with the same name, the one registered last will take effect.
+func RegisterCompressor(c Compressor) {
+	registeredCompressor[c.Name()] = c
+}
+
+// GetCompressor returns Compressor for the given compressor name.
+func GetCompressor(name string) Compressor {
+	return registeredCompressor[name]
+}
+
+// Codec defines the interface gRPC uses to encode and decode messages.  Note
+// that implementations of this interface must be thread safe; a Codec's
+// methods can be called from concurrent goroutines.
+type Codec interface {
+	// Marshal returns the wire format of v.
+	Marshal(v interface{}) ([]byte, error)
+	// Unmarshal parses the wire format into v.
+	Unmarshal(data []byte, v interface{}) error
+	// Name returns the name of the Codec implementation. The returned string
+	// will be used as part of content type in transmission.  The result must be
+	// static; the result cannot change between calls.
+	Name() string
+}
+
+var registeredCodecs = make(map[string]Codec)
+
+// RegisterCodec registers the provided Codec for use with all gRPC clients and
+// servers.
+//
+// The Codec will be stored and looked up by result of its Name() method, which
+// should match the content-subtype of the encoding handled by the Codec.  This
+// is case-insensitive, and is stored and looked up as lowercase.  If the
+// result of calling Name() is an empty string, RegisterCodec will panic. See
+// Content-Type on
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe.  If multiple Compressors are
+// registered with the same name, the one registered last will take effect.
+func RegisterCodec(codec Codec) {
+	if codec == nil {
+		panic("cannot register a nil Codec")
+	}
+	if codec.Name() == "" {
+		panic("cannot register Codec with empty string result for Name()")
+	}
+	contentSubtype := strings.ToLower(codec.Name())
+	registeredCodecs[contentSubtype] = codec
+}
+
+// GetCodec gets a registered Codec by content-subtype, or nil if no Codec is
+// registered for the content-subtype.
+//
+// The content-subtype is expected to be lowercase.
+func GetCodec(contentSubtype string) Codec {
+	return registeredCodecs[contentSubtype]
+}
diff --git a/vendor/google.golang.org/grpc/encoding/proto/proto.go b/vendor/google.golang.org/grpc/encoding/proto/proto.go
new file mode 100644
index 0000000..66b97a6
--- /dev/null
+++ b/vendor/google.golang.org/grpc/encoding/proto/proto.go
@@ -0,0 +1,110 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package proto defines the protobuf codec. Importing this package will
+// register the codec.
+package proto
+
+import (
+	"math"
+	"sync"
+
+	"github.com/golang/protobuf/proto"
+	"google.golang.org/grpc/encoding"
+)
+
+// Name is the name registered for the proto compressor.
+const Name = "proto"
+
+func init() {
+	encoding.RegisterCodec(codec{})
+}
+
+// codec is a Codec implementation with protobuf. It is the default codec for gRPC.
+type codec struct{}
+
+type cachedProtoBuffer struct {
+	lastMarshaledSize uint32
+	proto.Buffer
+}
+
+func capToMaxInt32(val int) uint32 {
+	if val > math.MaxInt32 {
+		return uint32(math.MaxInt32)
+	}
+	return uint32(val)
+}
+
+func marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) {
+	protoMsg := v.(proto.Message)
+	newSlice := make([]byte, 0, cb.lastMarshaledSize)
+
+	cb.SetBuf(newSlice)
+	cb.Reset()
+	if err := cb.Marshal(protoMsg); err != nil {
+		return nil, err
+	}
+	out := cb.Bytes()
+	cb.lastMarshaledSize = capToMaxInt32(len(out))
+	return out, nil
+}
+
+func (codec) Marshal(v interface{}) ([]byte, error) {
+	if pm, ok := v.(proto.Marshaler); ok {
+		// object can marshal itself, no need for buffer
+		return pm.Marshal()
+	}
+
+	cb := protoBufferPool.Get().(*cachedProtoBuffer)
+	out, err := marshal(v, cb)
+
+	// put back buffer and lose the ref to the slice
+	cb.SetBuf(nil)
+	protoBufferPool.Put(cb)
+	return out, err
+}
+
+func (codec) Unmarshal(data []byte, v interface{}) error {
+	protoMsg := v.(proto.Message)
+	protoMsg.Reset()
+
+	if pu, ok := protoMsg.(proto.Unmarshaler); ok {
+		// object can unmarshal itself, no need for buffer
+		return pu.Unmarshal(data)
+	}
+
+	cb := protoBufferPool.Get().(*cachedProtoBuffer)
+	cb.SetBuf(data)
+	err := cb.Unmarshal(protoMsg)
+	cb.SetBuf(nil)
+	protoBufferPool.Put(cb)
+	return err
+}
+
+func (codec) Name() string {
+	return Name
+}
+
+var protoBufferPool = &sync.Pool{
+	New: func() interface{} {
+		return &cachedProtoBuffer{
+			Buffer:            proto.Buffer{},
+			lastMarshaledSize: 16,
+		}
+	},
+}
diff --git a/vendor/google.golang.org/grpc/go.mod b/vendor/google.golang.org/grpc/go.mod
new file mode 100644
index 0000000..2378361
--- /dev/null
+++ b/vendor/google.golang.org/grpc/go.mod
@@ -0,0 +1,16 @@
+module google.golang.org/grpc
+
+go 1.11
+
+require (
+	github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473
+	github.com/envoyproxy/protoc-gen-validate v0.1.0
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/golang/mock v1.1.1
+	github.com/golang/protobuf v1.3.2
+	github.com/google/go-cmp v0.2.0
+	golang.org/x/net v0.0.0-20190311183353-d8887717615a
+	golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be
+	golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a
+	google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55
+)
diff --git a/vendor/google.golang.org/grpc/go.sum b/vendor/google.golang.org/grpc/go.sum
new file mode 100644
index 0000000..dd5d0ce
--- /dev/null
+++ b/vendor/google.golang.org/grpc/go.sum
@@ -0,0 +1,53 @@
+cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473 h1:4cmBvAEBNJaGARUEs3/suWRyfyBfhf7I60WBZq+bv2w=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/protoc-gen-validate v0.1.0 h1:EQciDnbrYxy13PgWoY8AqoxGiPrpgBZ1R8UNe3ddc+A=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/mock v1.1.1 h1:G5FRp8JnTd7RQH5kemVNlMeyXQAztQ3mOWV95KxsXH8=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
+golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
+golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be h1:vEDujvNQGv4jgYKudGeI/+DAX4Jffq6hpD55MmoEvKs=
+golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 h1:gSJIx1SDwno+2ElGhA4+qG2zF97qiUzTM+rQ0klBOcE=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/vendor/google.golang.org/grpc/grpclog/grpclog.go b/vendor/google.golang.org/grpc/grpclog/grpclog.go
new file mode 100644
index 0000000..874ea6d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/grpclog/grpclog.go
@@ -0,0 +1,126 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package grpclog defines logging for grpc.
+//
+// All logs in transport and grpclb packages only go to verbose level 2.
+// All logs in other packages in grpc are logged in spite of the verbosity level.
+//
+// In the default logger,
+// severity level can be set by environment variable GRPC_GO_LOG_SEVERITY_LEVEL,
+// verbosity level can be set by GRPC_GO_LOG_VERBOSITY_LEVEL.
+package grpclog // import "google.golang.org/grpc/grpclog"
+
+import "os"
+
+var logger = newLoggerV2()
+
+// V reports whether verbosity level l is at least the requested verbose level.
+func V(l int) bool {
+	return logger.V(l)
+}
+
+// Info logs to the INFO log.
+func Info(args ...interface{}) {
+	logger.Info(args...)
+}
+
+// Infof logs to the INFO log. Arguments are handled in the manner of fmt.Printf.
+func Infof(format string, args ...interface{}) {
+	logger.Infof(format, args...)
+}
+
+// Infoln logs to the INFO log. Arguments are handled in the manner of fmt.Println.
+func Infoln(args ...interface{}) {
+	logger.Infoln(args...)
+}
+
+// Warning logs to the WARNING log.
+func Warning(args ...interface{}) {
+	logger.Warning(args...)
+}
+
+// Warningf logs to the WARNING log. Arguments are handled in the manner of fmt.Printf.
+func Warningf(format string, args ...interface{}) {
+	logger.Warningf(format, args...)
+}
+
+// Warningln logs to the WARNING log. Arguments are handled in the manner of fmt.Println.
+func Warningln(args ...interface{}) {
+	logger.Warningln(args...)
+}
+
+// Error logs to the ERROR log.
+func Error(args ...interface{}) {
+	logger.Error(args...)
+}
+
+// Errorf logs to the ERROR log. Arguments are handled in the manner of fmt.Printf.
+func Errorf(format string, args ...interface{}) {
+	logger.Errorf(format, args...)
+}
+
+// Errorln logs to the ERROR log. Arguments are handled in the manner of fmt.Println.
+func Errorln(args ...interface{}) {
+	logger.Errorln(args...)
+}
+
+// Fatal logs to the FATAL log. Arguments are handled in the manner of fmt.Print.
+// It calls os.Exit() with exit code 1.
+func Fatal(args ...interface{}) {
+	logger.Fatal(args...)
+	// Make sure fatal logs will exit.
+	os.Exit(1)
+}
+
+// Fatalf logs to the FATAL log. Arguments are handled in the manner of fmt.Printf.
+// It calls os.Exit() with exit code 1.
+func Fatalf(format string, args ...interface{}) {
+	logger.Fatalf(format, args...)
+	// Make sure fatal logs will exit.
+	os.Exit(1)
+}
+
+// Fatalln logs to the FATAL log. Arguments are handled in the manner of fmt.Println.
+// It calle os.Exit()) with exit code 1.
+func Fatalln(args ...interface{}) {
+	logger.Fatalln(args...)
+	// Make sure fatal logs will exit.
+	os.Exit(1)
+}
+
+// Print prints to the logger. Arguments are handled in the manner of fmt.Print.
+//
+// Deprecated: use Info.
+func Print(args ...interface{}) {
+	logger.Info(args...)
+}
+
+// Printf prints to the logger. Arguments are handled in the manner of fmt.Printf.
+//
+// Deprecated: use Infof.
+func Printf(format string, args ...interface{}) {
+	logger.Infof(format, args...)
+}
+
+// Println prints to the logger. Arguments are handled in the manner of fmt.Println.
+//
+// Deprecated: use Infoln.
+func Println(args ...interface{}) {
+	logger.Infoln(args...)
+}
diff --git a/vendor/google.golang.org/grpc/grpclog/logger.go b/vendor/google.golang.org/grpc/grpclog/logger.go
new file mode 100644
index 0000000..097494f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/grpclog/logger.go
@@ -0,0 +1,85 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpclog
+
+// Logger mimics golang's standard Logger as an interface.
+//
+// Deprecated: use LoggerV2.
+type Logger interface {
+	Fatal(args ...interface{})
+	Fatalf(format string, args ...interface{})
+	Fatalln(args ...interface{})
+	Print(args ...interface{})
+	Printf(format string, args ...interface{})
+	Println(args ...interface{})
+}
+
+// SetLogger sets the logger that is used in grpc. Call only from
+// init() functions.
+//
+// Deprecated: use SetLoggerV2.
+func SetLogger(l Logger) {
+	logger = &loggerWrapper{Logger: l}
+}
+
+// loggerWrapper wraps Logger into a LoggerV2.
+type loggerWrapper struct {
+	Logger
+}
+
+func (g *loggerWrapper) Info(args ...interface{}) {
+	g.Logger.Print(args...)
+}
+
+func (g *loggerWrapper) Infoln(args ...interface{}) {
+	g.Logger.Println(args...)
+}
+
+func (g *loggerWrapper) Infof(format string, args ...interface{}) {
+	g.Logger.Printf(format, args...)
+}
+
+func (g *loggerWrapper) Warning(args ...interface{}) {
+	g.Logger.Print(args...)
+}
+
+func (g *loggerWrapper) Warningln(args ...interface{}) {
+	g.Logger.Println(args...)
+}
+
+func (g *loggerWrapper) Warningf(format string, args ...interface{}) {
+	g.Logger.Printf(format, args...)
+}
+
+func (g *loggerWrapper) Error(args ...interface{}) {
+	g.Logger.Print(args...)
+}
+
+func (g *loggerWrapper) Errorln(args ...interface{}) {
+	g.Logger.Println(args...)
+}
+
+func (g *loggerWrapper) Errorf(format string, args ...interface{}) {
+	g.Logger.Printf(format, args...)
+}
+
+func (g *loggerWrapper) V(l int) bool {
+	// Returns true for all verbose level.
+	return true
+}
diff --git a/vendor/google.golang.org/grpc/grpclog/loggerv2.go b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
new file mode 100644
index 0000000..d493257
--- /dev/null
+++ b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
@@ -0,0 +1,195 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpclog
+
+import (
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"strconv"
+)
+
+// LoggerV2 does underlying logging work for grpclog.
+type LoggerV2 interface {
+	// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
+	Info(args ...interface{})
+	// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
+	Infoln(args ...interface{})
+	// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
+	Infof(format string, args ...interface{})
+	// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
+	Warning(args ...interface{})
+	// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
+	Warningln(args ...interface{})
+	// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
+	Warningf(format string, args ...interface{})
+	// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
+	Error(args ...interface{})
+	// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
+	Errorln(args ...interface{})
+	// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
+	Errorf(format string, args ...interface{})
+	// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
+	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
+	// Implementations may also call os.Exit() with a non-zero exit code.
+	Fatal(args ...interface{})
+	// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
+	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
+	// Implementations may also call os.Exit() with a non-zero exit code.
+	Fatalln(args ...interface{})
+	// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
+	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
+	// Implementations may also call os.Exit() with a non-zero exit code.
+	Fatalf(format string, args ...interface{})
+	// V reports whether verbosity level l is at least the requested verbose level.
+	V(l int) bool
+}
+
+// SetLoggerV2 sets logger that is used in grpc to a V2 logger.
+// Not mutex-protected, should be called before any gRPC functions.
+func SetLoggerV2(l LoggerV2) {
+	logger = l
+}
+
+const (
+	// infoLog indicates Info severity.
+	infoLog int = iota
+	// warningLog indicates Warning severity.
+	warningLog
+	// errorLog indicates Error severity.
+	errorLog
+	// fatalLog indicates Fatal severity.
+	fatalLog
+)
+
+// severityName contains the string representation of each severity.
+var severityName = []string{
+	infoLog:    "INFO",
+	warningLog: "WARNING",
+	errorLog:   "ERROR",
+	fatalLog:   "FATAL",
+}
+
+// loggerT is the default logger used by grpclog.
+type loggerT struct {
+	m []*log.Logger
+	v int
+}
+
+// NewLoggerV2 creates a loggerV2 with the provided writers.
+// Fatal logs will be written to errorW, warningW, infoW, followed by exit(1).
+// Error logs will be written to errorW, warningW and infoW.
+// Warning logs will be written to warningW and infoW.
+// Info logs will be written to infoW.
+func NewLoggerV2(infoW, warningW, errorW io.Writer) LoggerV2 {
+	return NewLoggerV2WithVerbosity(infoW, warningW, errorW, 0)
+}
+
+// NewLoggerV2WithVerbosity creates a loggerV2 with the provided writers and
+// verbosity level.
+func NewLoggerV2WithVerbosity(infoW, warningW, errorW io.Writer, v int) LoggerV2 {
+	var m []*log.Logger
+	m = append(m, log.New(infoW, severityName[infoLog]+": ", log.LstdFlags))
+	m = append(m, log.New(io.MultiWriter(infoW, warningW), severityName[warningLog]+": ", log.LstdFlags))
+	ew := io.MultiWriter(infoW, warningW, errorW) // ew will be used for error and fatal.
+	m = append(m, log.New(ew, severityName[errorLog]+": ", log.LstdFlags))
+	m = append(m, log.New(ew, severityName[fatalLog]+": ", log.LstdFlags))
+	return &loggerT{m: m, v: v}
+}
+
+// newLoggerV2 creates a loggerV2 to be used as default logger.
+// All logs are written to stderr.
+func newLoggerV2() LoggerV2 {
+	errorW := ioutil.Discard
+	warningW := ioutil.Discard
+	infoW := ioutil.Discard
+
+	logLevel := os.Getenv("GRPC_GO_LOG_SEVERITY_LEVEL")
+	switch logLevel {
+	case "", "ERROR", "error": // If env is unset, set level to ERROR.
+		errorW = os.Stderr
+	case "WARNING", "warning":
+		warningW = os.Stderr
+	case "INFO", "info":
+		infoW = os.Stderr
+	}
+
+	var v int
+	vLevel := os.Getenv("GRPC_GO_LOG_VERBOSITY_LEVEL")
+	if vl, err := strconv.Atoi(vLevel); err == nil {
+		v = vl
+	}
+	return NewLoggerV2WithVerbosity(infoW, warningW, errorW, v)
+}
+
+func (g *loggerT) Info(args ...interface{}) {
+	g.m[infoLog].Print(args...)
+}
+
+func (g *loggerT) Infoln(args ...interface{}) {
+	g.m[infoLog].Println(args...)
+}
+
+func (g *loggerT) Infof(format string, args ...interface{}) {
+	g.m[infoLog].Printf(format, args...)
+}
+
+func (g *loggerT) Warning(args ...interface{}) {
+	g.m[warningLog].Print(args...)
+}
+
+func (g *loggerT) Warningln(args ...interface{}) {
+	g.m[warningLog].Println(args...)
+}
+
+func (g *loggerT) Warningf(format string, args ...interface{}) {
+	g.m[warningLog].Printf(format, args...)
+}
+
+func (g *loggerT) Error(args ...interface{}) {
+	g.m[errorLog].Print(args...)
+}
+
+func (g *loggerT) Errorln(args ...interface{}) {
+	g.m[errorLog].Println(args...)
+}
+
+func (g *loggerT) Errorf(format string, args ...interface{}) {
+	g.m[errorLog].Printf(format, args...)
+}
+
+func (g *loggerT) Fatal(args ...interface{}) {
+	g.m[fatalLog].Fatal(args...)
+	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+}
+
+func (g *loggerT) Fatalln(args ...interface{}) {
+	g.m[fatalLog].Fatalln(args...)
+	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+}
+
+func (g *loggerT) Fatalf(format string, args ...interface{}) {
+	g.m[fatalLog].Fatalf(format, args...)
+	// No need to call os.Exit() again because log.Logger.Fatal() calls os.Exit().
+}
+
+func (g *loggerT) V(l int) bool {
+	return l <= g.v
+}
diff --git a/vendor/google.golang.org/grpc/install_gae.sh b/vendor/google.golang.org/grpc/install_gae.sh
new file mode 100644
index 0000000..7c7bcad
--- /dev/null
+++ b/vendor/google.golang.org/grpc/install_gae.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+TMP=$(mktemp -d /tmp/sdk.XXX) \
+&& curl -o $TMP.zip "https://storage.googleapis.com/appengine-sdks/featured/go_appengine_sdk_linux_amd64-1.9.68.zip" \
+&& unzip -q $TMP.zip -d $TMP \
+&& export PATH="$PATH:$TMP/go_appengine"
diff --git a/vendor/google.golang.org/grpc/interceptor.go b/vendor/google.golang.org/grpc/interceptor.go
new file mode 100644
index 0000000..8b73500
--- /dev/null
+++ b/vendor/google.golang.org/grpc/interceptor.go
@@ -0,0 +1,77 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+)
+
+// UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.
+type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error
+
+// UnaryClientInterceptor intercepts the execution of a unary RPC on the client. invoker is the handler to complete the RPC
+// and it is the responsibility of the interceptor to call it.
+// This is an EXPERIMENTAL API.
+type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
+
+// Streamer is called by StreamClientInterceptor to create a ClientStream.
+type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)
+
+// StreamClientInterceptor intercepts the creation of ClientStream. It may return a custom ClientStream to intercept all I/O
+// operations. streamer is the handler to create a ClientStream and it is the responsibility of the interceptor to call it.
+// This is an EXPERIMENTAL API.
+type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error)
+
+// UnaryServerInfo consists of various information about a unary RPC on
+// server side. All per-rpc information may be mutated by the interceptor.
+type UnaryServerInfo struct {
+	// Server is the service implementation the user provides. This is read-only.
+	Server interface{}
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+}
+
+// UnaryHandler defines the handler invoked by UnaryServerInterceptor to complete the normal
+// execution of a unary RPC. If a UnaryHandler returns an error, it should be produced by the
+// status package, or else gRPC will use codes.Unknown as the status code and err.Error() as
+// the status message of the RPC.
+type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)
+
+// UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info
+// contains all the information of this RPC the interceptor can operate on. And handler is the wrapper
+// of the service method implementation. It is the responsibility of the interceptor to invoke handler
+// to complete the RPC.
+type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)
+
+// StreamServerInfo consists of various information about a streaming RPC on
+// server side. All per-rpc information may be mutated by the interceptor.
+type StreamServerInfo struct {
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+	// IsClientStream indicates whether the RPC is a client streaming RPC.
+	IsClientStream bool
+	// IsServerStream indicates whether the RPC is a server streaming RPC.
+	IsServerStream bool
+}
+
+// StreamServerInterceptor provides a hook to intercept the execution of a streaming RPC on the server.
+// info contains all the information of this RPC the interceptor can operate on. And handler is the
+// service method implementation. It is the responsibility of the interceptor to invoke handler to
+// complete the RPC.
+type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error
diff --git a/vendor/google.golang.org/grpc/internal/backoff/backoff.go b/vendor/google.golang.org/grpc/internal/backoff/backoff.go
new file mode 100644
index 0000000..5fc0ee3
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/backoff/backoff.go
@@ -0,0 +1,73 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package backoff implement the backoff strategy for gRPC.
+//
+// This is kept in internal until the gRPC project decides whether or not to
+// allow alternative backoff strategies.
+package backoff
+
+import (
+	"time"
+
+	grpcbackoff "google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/internal/grpcrand"
+)
+
+// Strategy defines the methodology for backing off after a grpc connection
+// failure.
+type Strategy interface {
+	// Backoff returns the amount of time to wait before the next retry given
+	// the number of consecutive failures.
+	Backoff(retries int) time.Duration
+}
+
+// DefaultExponential is an exponential backoff implementation using the
+// default values for all the configurable knobs defined in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+var DefaultExponential = Exponential{Config: grpcbackoff.DefaultConfig}
+
+// Exponential implements exponential backoff algorithm as defined in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+type Exponential struct {
+	// Config contains all options to configure the backoff algorithm.
+	Config grpcbackoff.Config
+}
+
+// Backoff returns the amount of time to wait before the next retry given the
+// number of retries.
+func (bc Exponential) Backoff(retries int) time.Duration {
+	if retries == 0 {
+		return bc.Config.BaseDelay
+	}
+	backoff, max := float64(bc.Config.BaseDelay), float64(bc.Config.MaxDelay)
+	for backoff < max && retries > 0 {
+		backoff *= bc.Config.Multiplier
+		retries--
+	}
+	if backoff > max {
+		backoff = max
+	}
+	// Randomize backoff delays so that if a cluster of requests start at
+	// the same time, they won't operate in lockstep.
+	backoff *= 1 + bc.Config.Jitter*(grpcrand.Float64()*2-1)
+	if backoff < 0 {
+		return 0
+	}
+	return time.Duration(backoff)
+}
diff --git a/vendor/google.golang.org/grpc/internal/balancerload/load.go b/vendor/google.golang.org/grpc/internal/balancerload/load.go
new file mode 100644
index 0000000..3a905d9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/balancerload/load.go
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Package balancerload defines APIs to parse server loads in trailers. The
+// parsed loads are sent to balancers in DoneInfo.
+package balancerload
+
+import (
+	"google.golang.org/grpc/metadata"
+)
+
+// Parser converts loads from metadata into a concrete type.
+type Parser interface {
+	// Parse parses loads from metadata.
+	Parse(md metadata.MD) interface{}
+}
+
+var parser Parser
+
+// SetParser sets the load parser.
+//
+// Not mutex-protected, should be called before any gRPC functions.
+func SetParser(lr Parser) {
+	parser = lr
+}
+
+// Parse calls parser.Read().
+func Parse(md metadata.MD) interface{} {
+	if parser == nil {
+		return nil
+	}
+	return parser.Parse(md)
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
new file mode 100644
index 0000000..8b10516
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
@@ -0,0 +1,167 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package binarylog implementation binary logging as defined in
+// https://github.com/grpc/proposal/blob/master/A16-binary-logging.md.
+package binarylog
+
+import (
+	"fmt"
+	"os"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+// Logger is the global binary logger. It can be used to get binary logger for
+// each method.
+type Logger interface {
+	getMethodLogger(methodName string) *MethodLogger
+}
+
+// binLogger is the global binary logger for the binary. One of this should be
+// built at init time from the configuration (environment variable or flags).
+//
+// It is used to get a methodLogger for each individual method.
+var binLogger Logger
+
+// SetLogger sets the binarg logger.
+//
+// Only call this at init time.
+func SetLogger(l Logger) {
+	binLogger = l
+}
+
+// GetMethodLogger returns the methodLogger for the given methodName.
+//
+// methodName should be in the format of "/service/method".
+//
+// Each methodLogger returned by this method is a new instance. This is to
+// generate sequence id within the call.
+func GetMethodLogger(methodName string) *MethodLogger {
+	if binLogger == nil {
+		return nil
+	}
+	return binLogger.getMethodLogger(methodName)
+}
+
+func init() {
+	const envStr = "GRPC_BINARY_LOG_FILTER"
+	configStr := os.Getenv(envStr)
+	binLogger = NewLoggerFromConfigString(configStr)
+}
+
+type methodLoggerConfig struct {
+	// Max length of header and message.
+	hdr, msg uint64
+}
+
+type logger struct {
+	all      *methodLoggerConfig
+	services map[string]*methodLoggerConfig
+	methods  map[string]*methodLoggerConfig
+
+	blacklist map[string]struct{}
+}
+
+// newEmptyLogger creates an empty logger. The map fields need to be filled in
+// using the set* functions.
+func newEmptyLogger() *logger {
+	return &logger{}
+}
+
+// Set method logger for "*".
+func (l *logger) setDefaultMethodLogger(ml *methodLoggerConfig) error {
+	if l.all != nil {
+		return fmt.Errorf("conflicting global rules found")
+	}
+	l.all = ml
+	return nil
+}
+
+// Set method logger for "service/*".
+//
+// New methodLogger with same service overrides the old one.
+func (l *logger) setServiceMethodLogger(service string, ml *methodLoggerConfig) error {
+	if _, ok := l.services[service]; ok {
+		return fmt.Errorf("conflicting service rules for service %v found", service)
+	}
+	if l.services == nil {
+		l.services = make(map[string]*methodLoggerConfig)
+	}
+	l.services[service] = ml
+	return nil
+}
+
+// Set method logger for "service/method".
+//
+// New methodLogger with same method overrides the old one.
+func (l *logger) setMethodMethodLogger(method string, ml *methodLoggerConfig) error {
+	if _, ok := l.blacklist[method]; ok {
+		return fmt.Errorf("conflicting blacklist rules for method %v found", method)
+	}
+	if _, ok := l.methods[method]; ok {
+		return fmt.Errorf("conflicting method rules for method %v found", method)
+	}
+	if l.methods == nil {
+		l.methods = make(map[string]*methodLoggerConfig)
+	}
+	l.methods[method] = ml
+	return nil
+}
+
+// Set blacklist method for "-service/method".
+func (l *logger) setBlacklist(method string) error {
+	if _, ok := l.blacklist[method]; ok {
+		return fmt.Errorf("conflicting blacklist rules for method %v found", method)
+	}
+	if _, ok := l.methods[method]; ok {
+		return fmt.Errorf("conflicting method rules for method %v found", method)
+	}
+	if l.blacklist == nil {
+		l.blacklist = make(map[string]struct{})
+	}
+	l.blacklist[method] = struct{}{}
+	return nil
+}
+
+// getMethodLogger returns the methodLogger for the given methodName.
+//
+// methodName should be in the format of "/service/method".
+//
+// Each methodLogger returned by this method is a new instance. This is to
+// generate sequence id within the call.
+func (l *logger) getMethodLogger(methodName string) *MethodLogger {
+	s, m, err := parseMethodName(methodName)
+	if err != nil {
+		grpclog.Infof("binarylogging: failed to parse %q: %v", methodName, err)
+		return nil
+	}
+	if ml, ok := l.methods[s+"/"+m]; ok {
+		return newMethodLogger(ml.hdr, ml.msg)
+	}
+	if _, ok := l.blacklist[s+"/"+m]; ok {
+		return nil
+	}
+	if ml, ok := l.services[s]; ok {
+		return newMethodLogger(ml.hdr, ml.msg)
+	}
+	if l.all == nil {
+		return nil
+	}
+	return newMethodLogger(l.all.hdr, l.all.msg)
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/binarylog_testutil.go b/vendor/google.golang.org/grpc/internal/binarylog/binarylog_testutil.go
new file mode 100644
index 0000000..1ee00a3
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/binarylog_testutil.go
@@ -0,0 +1,42 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// This file contains exported variables/functions that are exported for testing
+// only.
+//
+// An ideal way for this would be to put those in a *_test.go but in binarylog
+// package. But this doesn't work with staticcheck with go module. Error was:
+// "MdToMetadataProto not declared by package binarylog". This could be caused
+// by the way staticcheck looks for files for a certain package, which doesn't
+// support *_test.go files.
+//
+// Move those to binary_test.go when staticcheck is fixed.
+
+package binarylog
+
+var (
+	// AllLogger is a logger that logs all headers/messages for all RPCs. It's
+	// for testing only.
+	AllLogger = NewLoggerFromConfigString("*")
+	// MdToMetadataProto converts metadata to a binary logging proto message.
+	// It's for testing only.
+	MdToMetadataProto = mdToMetadataProto
+	// AddrToProto converts an address to a binary logging proto message. It's
+	// for testing only.
+	AddrToProto = addrToProto
+)
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/env_config.go b/vendor/google.golang.org/grpc/internal/binarylog/env_config.go
new file mode 100644
index 0000000..be30d0e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/env_config.go
@@ -0,0 +1,210 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package binarylog
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+// NewLoggerFromConfigString reads the string and build a logger. It can be used
+// to build a new logger and assign it to binarylog.Logger.
+//
+// Example filter config strings:
+//  - "" Nothing will be logged
+//  - "*" All headers and messages will be fully logged.
+//  - "*{h}" Only headers will be logged.
+//  - "*{m:256}" Only the first 256 bytes of each message will be logged.
+//  - "Foo/*" Logs every method in service Foo
+//  - "Foo/*,-Foo/Bar" Logs every method in service Foo except method /Foo/Bar
+//  - "Foo/*,Foo/Bar{m:256}" Logs the first 256 bytes of each message in method
+//    /Foo/Bar, logs all headers and messages in every other method in service
+//    Foo.
+//
+// If two configs exist for one certain method or service, the one specified
+// later overrides the previous config.
+func NewLoggerFromConfigString(s string) Logger {
+	if s == "" {
+		return nil
+	}
+	l := newEmptyLogger()
+	methods := strings.Split(s, ",")
+	for _, method := range methods {
+		if err := l.fillMethodLoggerWithConfigString(method); err != nil {
+			grpclog.Warningf("failed to parse binary log config: %v", err)
+			return nil
+		}
+	}
+	return l
+}
+
+// fillMethodLoggerWithConfigString parses config, creates methodLogger and adds
+// it to the right map in the logger.
+func (l *logger) fillMethodLoggerWithConfigString(config string) error {
+	// "" is invalid.
+	if config == "" {
+		return errors.New("empty string is not a valid method binary logging config")
+	}
+
+	// "-service/method", blacklist, no * or {} allowed.
+	if config[0] == '-' {
+		s, m, suffix, err := parseMethodConfigAndSuffix(config[1:])
+		if err != nil {
+			return fmt.Errorf("invalid config: %q, %v", config, err)
+		}
+		if m == "*" {
+			return fmt.Errorf("invalid config: %q, %v", config, "* not allowed in blacklist config")
+		}
+		if suffix != "" {
+			return fmt.Errorf("invalid config: %q, %v", config, "header/message limit not allowed in blacklist config")
+		}
+		if err := l.setBlacklist(s + "/" + m); err != nil {
+			return fmt.Errorf("invalid config: %v", err)
+		}
+		return nil
+	}
+
+	// "*{h:256;m:256}"
+	if config[0] == '*' {
+		hdr, msg, err := parseHeaderMessageLengthConfig(config[1:])
+		if err != nil {
+			return fmt.Errorf("invalid config: %q, %v", config, err)
+		}
+		if err := l.setDefaultMethodLogger(&methodLoggerConfig{hdr: hdr, msg: msg}); err != nil {
+			return fmt.Errorf("invalid config: %v", err)
+		}
+		return nil
+	}
+
+	s, m, suffix, err := parseMethodConfigAndSuffix(config)
+	if err != nil {
+		return fmt.Errorf("invalid config: %q, %v", config, err)
+	}
+	hdr, msg, err := parseHeaderMessageLengthConfig(suffix)
+	if err != nil {
+		return fmt.Errorf("invalid header/message length config: %q, %v", suffix, err)
+	}
+	if m == "*" {
+		if err := l.setServiceMethodLogger(s, &methodLoggerConfig{hdr: hdr, msg: msg}); err != nil {
+			return fmt.Errorf("invalid config: %v", err)
+		}
+	} else {
+		if err := l.setMethodMethodLogger(s+"/"+m, &methodLoggerConfig{hdr: hdr, msg: msg}); err != nil {
+			return fmt.Errorf("invalid config: %v", err)
+		}
+	}
+	return nil
+}
+
+const (
+	// TODO: this const is only used by env_config now. But could be useful for
+	// other config. Move to binarylog.go if necessary.
+	maxUInt = ^uint64(0)
+
+	// For "p.s/m" plus any suffix. Suffix will be parsed again. See test for
+	// expected output.
+	longMethodConfigRegexpStr = `^([\w./]+)/((?:\w+)|[*])(.+)?$`
+
+	// For suffix from above, "{h:123,m:123}". See test for expected output.
+	optionalLengthRegexpStr      = `(?::(\d+))?` // Optional ":123".
+	headerConfigRegexpStr        = `^{h` + optionalLengthRegexpStr + `}$`
+	messageConfigRegexpStr       = `^{m` + optionalLengthRegexpStr + `}$`
+	headerMessageConfigRegexpStr = `^{h` + optionalLengthRegexpStr + `;m` + optionalLengthRegexpStr + `}$`
+)
+
+var (
+	longMethodConfigRegexp    = regexp.MustCompile(longMethodConfigRegexpStr)
+	headerConfigRegexp        = regexp.MustCompile(headerConfigRegexpStr)
+	messageConfigRegexp       = regexp.MustCompile(messageConfigRegexpStr)
+	headerMessageConfigRegexp = regexp.MustCompile(headerMessageConfigRegexpStr)
+)
+
+// Turn "service/method{h;m}" into "service", "method", "{h;m}".
+func parseMethodConfigAndSuffix(c string) (service, method, suffix string, _ error) {
+	// Regexp result:
+	//
+	// in:  "p.s/m{h:123,m:123}",
+	// out: []string{"p.s/m{h:123,m:123}", "p.s", "m", "{h:123,m:123}"},
+	match := longMethodConfigRegexp.FindStringSubmatch(c)
+	if match == nil {
+		return "", "", "", fmt.Errorf("%q contains invalid substring", c)
+	}
+	service = match[1]
+	method = match[2]
+	suffix = match[3]
+	return
+}
+
+// Turn "{h:123;m:345}" into 123, 345.
+//
+// Return maxUInt if length is unspecified.
+func parseHeaderMessageLengthConfig(c string) (hdrLenStr, msgLenStr uint64, err error) {
+	if c == "" {
+		return maxUInt, maxUInt, nil
+	}
+	// Header config only.
+	if match := headerConfigRegexp.FindStringSubmatch(c); match != nil {
+		if s := match[1]; s != "" {
+			hdrLenStr, err = strconv.ParseUint(s, 10, 64)
+			if err != nil {
+				return 0, 0, fmt.Errorf("failed to convert %q to uint", s)
+			}
+			return hdrLenStr, 0, nil
+		}
+		return maxUInt, 0, nil
+	}
+
+	// Message config only.
+	if match := messageConfigRegexp.FindStringSubmatch(c); match != nil {
+		if s := match[1]; s != "" {
+			msgLenStr, err = strconv.ParseUint(s, 10, 64)
+			if err != nil {
+				return 0, 0, fmt.Errorf("failed to convert %q to uint", s)
+			}
+			return 0, msgLenStr, nil
+		}
+		return 0, maxUInt, nil
+	}
+
+	// Header and message config both.
+	if match := headerMessageConfigRegexp.FindStringSubmatch(c); match != nil {
+		// Both hdr and msg are specified, but one or two of them might be empty.
+		hdrLenStr = maxUInt
+		msgLenStr = maxUInt
+		if s := match[1]; s != "" {
+			hdrLenStr, err = strconv.ParseUint(s, 10, 64)
+			if err != nil {
+				return 0, 0, fmt.Errorf("failed to convert %q to uint", s)
+			}
+		}
+		if s := match[2]; s != "" {
+			msgLenStr, err = strconv.ParseUint(s, 10, 64)
+			if err != nil {
+				return 0, 0, fmt.Errorf("failed to convert %q to uint", s)
+			}
+		}
+		return hdrLenStr, msgLenStr, nil
+	}
+	return 0, 0, fmt.Errorf("%q contains invalid substring", c)
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go b/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go
new file mode 100644
index 0000000..160f6e8
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go
@@ -0,0 +1,423 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package binarylog
+
+import (
+	"net"
+	"strings"
+	"sync/atomic"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes"
+	pb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+)
+
+type callIDGenerator struct {
+	id uint64
+}
+
+func (g *callIDGenerator) next() uint64 {
+	id := atomic.AddUint64(&g.id, 1)
+	return id
+}
+
+// reset is for testing only, and doesn't need to be thread safe.
+func (g *callIDGenerator) reset() {
+	g.id = 0
+}
+
+var idGen callIDGenerator
+
+// MethodLogger is the sub-logger for each method.
+type MethodLogger struct {
+	headerMaxLen, messageMaxLen uint64
+
+	callID          uint64
+	idWithinCallGen *callIDGenerator
+
+	sink Sink // TODO(blog): make this plugable.
+}
+
+func newMethodLogger(h, m uint64) *MethodLogger {
+	return &MethodLogger{
+		headerMaxLen:  h,
+		messageMaxLen: m,
+
+		callID:          idGen.next(),
+		idWithinCallGen: &callIDGenerator{},
+
+		sink: defaultSink, // TODO(blog): make it plugable.
+	}
+}
+
+// Log creates a proto binary log entry, and logs it to the sink.
+func (ml *MethodLogger) Log(c LogEntryConfig) {
+	m := c.toProto()
+	timestamp, _ := ptypes.TimestampProto(time.Now())
+	m.Timestamp = timestamp
+	m.CallId = ml.callID
+	m.SequenceIdWithinCall = ml.idWithinCallGen.next()
+
+	switch pay := m.Payload.(type) {
+	case *pb.GrpcLogEntry_ClientHeader:
+		m.PayloadTruncated = ml.truncateMetadata(pay.ClientHeader.GetMetadata())
+	case *pb.GrpcLogEntry_ServerHeader:
+		m.PayloadTruncated = ml.truncateMetadata(pay.ServerHeader.GetMetadata())
+	case *pb.GrpcLogEntry_Message:
+		m.PayloadTruncated = ml.truncateMessage(pay.Message)
+	}
+
+	ml.sink.Write(m)
+}
+
+func (ml *MethodLogger) truncateMetadata(mdPb *pb.Metadata) (truncated bool) {
+	if ml.headerMaxLen == maxUInt {
+		return false
+	}
+	var (
+		bytesLimit = ml.headerMaxLen
+		index      int
+	)
+	// At the end of the loop, index will be the first entry where the total
+	// size is greater than the limit:
+	//
+	// len(entry[:index]) <= ml.hdr && len(entry[:index+1]) > ml.hdr.
+	for ; index < len(mdPb.Entry); index++ {
+		entry := mdPb.Entry[index]
+		if entry.Key == "grpc-trace-bin" {
+			// "grpc-trace-bin" is a special key. It's kept in the log entry,
+			// but not counted towards the size limit.
+			continue
+		}
+		currentEntryLen := uint64(len(entry.Value))
+		if currentEntryLen > bytesLimit {
+			break
+		}
+		bytesLimit -= currentEntryLen
+	}
+	truncated = index < len(mdPb.Entry)
+	mdPb.Entry = mdPb.Entry[:index]
+	return truncated
+}
+
+func (ml *MethodLogger) truncateMessage(msgPb *pb.Message) (truncated bool) {
+	if ml.messageMaxLen == maxUInt {
+		return false
+	}
+	if ml.messageMaxLen >= uint64(len(msgPb.Data)) {
+		return false
+	}
+	msgPb.Data = msgPb.Data[:ml.messageMaxLen]
+	return true
+}
+
+// LogEntryConfig represents the configuration for binary log entry.
+type LogEntryConfig interface {
+	toProto() *pb.GrpcLogEntry
+}
+
+// ClientHeader configs the binary log entry to be a ClientHeader entry.
+type ClientHeader struct {
+	OnClientSide bool
+	Header       metadata.MD
+	MethodName   string
+	Authority    string
+	Timeout      time.Duration
+	// PeerAddr is required only when it's on server side.
+	PeerAddr net.Addr
+}
+
+func (c *ClientHeader) toProto() *pb.GrpcLogEntry {
+	// This function doesn't need to set all the fields (e.g. seq ID). The Log
+	// function will set the fields when necessary.
+	clientHeader := &pb.ClientHeader{
+		Metadata:   mdToMetadataProto(c.Header),
+		MethodName: c.MethodName,
+		Authority:  c.Authority,
+	}
+	if c.Timeout > 0 {
+		clientHeader.Timeout = ptypes.DurationProto(c.Timeout)
+	}
+	ret := &pb.GrpcLogEntry{
+		Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HEADER,
+		Payload: &pb.GrpcLogEntry_ClientHeader{
+			ClientHeader: clientHeader,
+		},
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	if c.PeerAddr != nil {
+		ret.Peer = addrToProto(c.PeerAddr)
+	}
+	return ret
+}
+
+// ServerHeader configs the binary log entry to be a ServerHeader entry.
+type ServerHeader struct {
+	OnClientSide bool
+	Header       metadata.MD
+	// PeerAddr is required only when it's on client side.
+	PeerAddr net.Addr
+}
+
+func (c *ServerHeader) toProto() *pb.GrpcLogEntry {
+	ret := &pb.GrpcLogEntry{
+		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_HEADER,
+		Payload: &pb.GrpcLogEntry_ServerHeader{
+			ServerHeader: &pb.ServerHeader{
+				Metadata: mdToMetadataProto(c.Header),
+			},
+		},
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	if c.PeerAddr != nil {
+		ret.Peer = addrToProto(c.PeerAddr)
+	}
+	return ret
+}
+
+// ClientMessage configs the binary log entry to be a ClientMessage entry.
+type ClientMessage struct {
+	OnClientSide bool
+	// Message can be a proto.Message or []byte. Other messages formats are not
+	// supported.
+	Message interface{}
+}
+
+func (c *ClientMessage) toProto() *pb.GrpcLogEntry {
+	var (
+		data []byte
+		err  error
+	)
+	if m, ok := c.Message.(proto.Message); ok {
+		data, err = proto.Marshal(m)
+		if err != nil {
+			grpclog.Infof("binarylogging: failed to marshal proto message: %v", err)
+		}
+	} else if b, ok := c.Message.([]byte); ok {
+		data = b
+	} else {
+		grpclog.Infof("binarylogging: message to log is neither proto.message nor []byte")
+	}
+	ret := &pb.GrpcLogEntry{
+		Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_MESSAGE,
+		Payload: &pb.GrpcLogEntry_Message{
+			Message: &pb.Message{
+				Length: uint32(len(data)),
+				Data:   data,
+			},
+		},
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	return ret
+}
+
+// ServerMessage configs the binary log entry to be a ServerMessage entry.
+type ServerMessage struct {
+	OnClientSide bool
+	// Message can be a proto.Message or []byte. Other messages formats are not
+	// supported.
+	Message interface{}
+}
+
+func (c *ServerMessage) toProto() *pb.GrpcLogEntry {
+	var (
+		data []byte
+		err  error
+	)
+	if m, ok := c.Message.(proto.Message); ok {
+		data, err = proto.Marshal(m)
+		if err != nil {
+			grpclog.Infof("binarylogging: failed to marshal proto message: %v", err)
+		}
+	} else if b, ok := c.Message.([]byte); ok {
+		data = b
+	} else {
+		grpclog.Infof("binarylogging: message to log is neither proto.message nor []byte")
+	}
+	ret := &pb.GrpcLogEntry{
+		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_MESSAGE,
+		Payload: &pb.GrpcLogEntry_Message{
+			Message: &pb.Message{
+				Length: uint32(len(data)),
+				Data:   data,
+			},
+		},
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	return ret
+}
+
+// ClientHalfClose configs the binary log entry to be a ClientHalfClose entry.
+type ClientHalfClose struct {
+	OnClientSide bool
+}
+
+func (c *ClientHalfClose) toProto() *pb.GrpcLogEntry {
+	ret := &pb.GrpcLogEntry{
+		Type:    pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HALF_CLOSE,
+		Payload: nil, // No payload here.
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	return ret
+}
+
+// ServerTrailer configs the binary log entry to be a ServerTrailer entry.
+type ServerTrailer struct {
+	OnClientSide bool
+	Trailer      metadata.MD
+	// Err is the status error.
+	Err error
+	// PeerAddr is required only when it's on client side and the RPC is trailer
+	// only.
+	PeerAddr net.Addr
+}
+
+func (c *ServerTrailer) toProto() *pb.GrpcLogEntry {
+	st, ok := status.FromError(c.Err)
+	if !ok {
+		grpclog.Info("binarylogging: error in trailer is not a status error")
+	}
+	var (
+		detailsBytes []byte
+		err          error
+	)
+	stProto := st.Proto()
+	if stProto != nil && len(stProto.Details) != 0 {
+		detailsBytes, err = proto.Marshal(stProto)
+		if err != nil {
+			grpclog.Infof("binarylogging: failed to marshal status proto: %v", err)
+		}
+	}
+	ret := &pb.GrpcLogEntry{
+		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_TRAILER,
+		Payload: &pb.GrpcLogEntry_Trailer{
+			Trailer: &pb.Trailer{
+				Metadata:      mdToMetadataProto(c.Trailer),
+				StatusCode:    uint32(st.Code()),
+				StatusMessage: st.Message(),
+				StatusDetails: detailsBytes,
+			},
+		},
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	if c.PeerAddr != nil {
+		ret.Peer = addrToProto(c.PeerAddr)
+	}
+	return ret
+}
+
+// Cancel configs the binary log entry to be a Cancel entry.
+type Cancel struct {
+	OnClientSide bool
+}
+
+func (c *Cancel) toProto() *pb.GrpcLogEntry {
+	ret := &pb.GrpcLogEntry{
+		Type:    pb.GrpcLogEntry_EVENT_TYPE_CANCEL,
+		Payload: nil,
+	}
+	if c.OnClientSide {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+	} else {
+		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+	}
+	return ret
+}
+
+// metadataKeyOmit returns whether the metadata entry with this key should be
+// omitted.
+func metadataKeyOmit(key string) bool {
+	switch key {
+	case "lb-token", ":path", ":authority", "content-encoding", "content-type", "user-agent", "te":
+		return true
+	case "grpc-trace-bin": // grpc-trace-bin is special because it's visiable to users.
+		return false
+	}
+	return strings.HasPrefix(key, "grpc-")
+}
+
+func mdToMetadataProto(md metadata.MD) *pb.Metadata {
+	ret := &pb.Metadata{}
+	for k, vv := range md {
+		if metadataKeyOmit(k) {
+			continue
+		}
+		for _, v := range vv {
+			ret.Entry = append(ret.Entry,
+				&pb.MetadataEntry{
+					Key:   k,
+					Value: []byte(v),
+				},
+			)
+		}
+	}
+	return ret
+}
+
+func addrToProto(addr net.Addr) *pb.Address {
+	ret := &pb.Address{}
+	switch a := addr.(type) {
+	case *net.TCPAddr:
+		if a.IP.To4() != nil {
+			ret.Type = pb.Address_TYPE_IPV4
+		} else if a.IP.To16() != nil {
+			ret.Type = pb.Address_TYPE_IPV6
+		} else {
+			ret.Type = pb.Address_TYPE_UNKNOWN
+			// Do not set address and port fields.
+			break
+		}
+		ret.Address = a.IP.String()
+		ret.IpPort = uint32(a.Port)
+	case *net.UnixAddr:
+		ret.Type = pb.Address_TYPE_UNIX
+		ret.Address = a.String()
+	default:
+		ret.Type = pb.Address_TYPE_UNKNOWN
+	}
+	return ret
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/regenerate.sh b/vendor/google.golang.org/grpc/internal/binarylog/regenerate.sh
new file mode 100644
index 0000000..113d40c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/regenerate.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eux -o pipefail
+
+TMP=$(mktemp -d)
+
+function finish {
+  rm -rf "$TMP"
+}
+trap finish EXIT
+
+pushd "$TMP"
+mkdir -p grpc/binarylog/grpc_binarylog_v1
+curl https://raw.githubusercontent.com/grpc/grpc-proto/master/grpc/binlog/v1/binarylog.proto > grpc/binarylog/grpc_binarylog_v1/binarylog.proto
+
+protoc --go_out=plugins=grpc,paths=source_relative:. -I. grpc/binarylog/grpc_binarylog_v1/*.proto
+popd
+rm -f ./grpc_binarylog_v1/*.pb.go
+cp "$TMP"/grpc/binarylog/grpc_binarylog_v1/*.pb.go ../../binarylog/grpc_binarylog_v1/
+
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/sink.go b/vendor/google.golang.org/grpc/internal/binarylog/sink.go
new file mode 100644
index 0000000..a2e7c34
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/sink.go
@@ -0,0 +1,162 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package binarylog
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	pb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
+	"google.golang.org/grpc/grpclog"
+)
+
+var (
+	defaultSink Sink = &noopSink{} // TODO(blog): change this default (file in /tmp).
+)
+
+// SetDefaultSink sets the sink where binary logs will be written to.
+//
+// Not thread safe. Only set during initialization.
+func SetDefaultSink(s Sink) {
+	if defaultSink != nil {
+		defaultSink.Close()
+	}
+	defaultSink = s
+}
+
+// Sink writes log entry into the binary log sink.
+type Sink interface {
+	// Write will be called to write the log entry into the sink.
+	//
+	// It should be thread-safe so it can be called in parallel.
+	Write(*pb.GrpcLogEntry) error
+	// Close will be called when the Sink is replaced by a new Sink.
+	Close() error
+}
+
+type noopSink struct{}
+
+func (ns *noopSink) Write(*pb.GrpcLogEntry) error { return nil }
+func (ns *noopSink) Close() error                 { return nil }
+
+// newWriterSink creates a binary log sink with the given writer.
+//
+// Write() marshals the proto message and writes it to the given writer. Each
+// message is prefixed with a 4 byte big endian unsigned integer as the length.
+//
+// No buffer is done, Close() doesn't try to close the writer.
+func newWriterSink(w io.Writer) *writerSink {
+	return &writerSink{out: w}
+}
+
+type writerSink struct {
+	out io.Writer
+}
+
+func (ws *writerSink) Write(e *pb.GrpcLogEntry) error {
+	b, err := proto.Marshal(e)
+	if err != nil {
+		grpclog.Infof("binary logging: failed to marshal proto message: %v", err)
+	}
+	hdr := make([]byte, 4)
+	binary.BigEndian.PutUint32(hdr, uint32(len(b)))
+	if _, err := ws.out.Write(hdr); err != nil {
+		return err
+	}
+	if _, err := ws.out.Write(b); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (ws *writerSink) Close() error { return nil }
+
+type bufWriteCloserSink struct {
+	mu     sync.Mutex
+	closer io.Closer
+	out    *writerSink   // out is built on buf.
+	buf    *bufio.Writer // buf is kept for flush.
+
+	writeStartOnce sync.Once
+	writeTicker    *time.Ticker
+}
+
+func (fs *bufWriteCloserSink) Write(e *pb.GrpcLogEntry) error {
+	// Start the write loop when Write is called.
+	fs.writeStartOnce.Do(fs.startFlushGoroutine)
+	fs.mu.Lock()
+	if err := fs.out.Write(e); err != nil {
+		fs.mu.Unlock()
+		return err
+	}
+	fs.mu.Unlock()
+	return nil
+}
+
+const (
+	bufFlushDuration = 60 * time.Second
+)
+
+func (fs *bufWriteCloserSink) startFlushGoroutine() {
+	fs.writeTicker = time.NewTicker(bufFlushDuration)
+	go func() {
+		for range fs.writeTicker.C {
+			fs.mu.Lock()
+			fs.buf.Flush()
+			fs.mu.Unlock()
+		}
+	}()
+}
+
+func (fs *bufWriteCloserSink) Close() error {
+	if fs.writeTicker != nil {
+		fs.writeTicker.Stop()
+	}
+	fs.mu.Lock()
+	fs.buf.Flush()
+	fs.closer.Close()
+	fs.out.Close()
+	fs.mu.Unlock()
+	return nil
+}
+
+func newBufWriteCloserSink(o io.WriteCloser) Sink {
+	bufW := bufio.NewWriter(o)
+	return &bufWriteCloserSink{
+		closer: o,
+		out:    newWriterSink(bufW),
+		buf:    bufW,
+	}
+}
+
+// NewTempFileSink creates a temp file and returns a Sink that writes to this
+// file.
+func NewTempFileSink() (Sink, error) {
+	tempFile, err := ioutil.TempFile("/tmp", "grpcgo_binarylog_*.txt")
+	if err != nil {
+		return nil, fmt.Errorf("failed to create temp file: %v", err)
+	}
+	return newBufWriteCloserSink(tempFile), nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/util.go b/vendor/google.golang.org/grpc/internal/binarylog/util.go
new file mode 100644
index 0000000..15dc780
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/binarylog/util.go
@@ -0,0 +1,41 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package binarylog
+
+import (
+	"errors"
+	"strings"
+)
+
+// parseMethodName splits service and method from the input. It expects format
+// "/service/method".
+//
+// TODO: move to internal/grpcutil.
+func parseMethodName(methodName string) (service, method string, _ error) {
+	if !strings.HasPrefix(methodName, "/") {
+		return "", "", errors.New("invalid method name: should start with /")
+	}
+	methodName = methodName[1:]
+
+	pos := strings.LastIndex(methodName, "/")
+	if pos < 0 {
+		return "", "", errors.New("invalid method name: suffix /method is missing")
+	}
+	return methodName[:pos], methodName[pos+1:], nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/buffer/unbounded.go b/vendor/google.golang.org/grpc/internal/buffer/unbounded.go
new file mode 100644
index 0000000..9f6a0c1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/buffer/unbounded.go
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package buffer provides an implementation of an unbounded buffer.
+package buffer
+
+import "sync"
+
+// Unbounded is an implementation of an unbounded buffer which does not use
+// extra goroutines. This is typically used for passing updates from one entity
+// to another within gRPC.
+//
+// All methods on this type are thread-safe and don't block on anything except
+// the underlying mutex used for synchronization.
+//
+// Unbounded supports values of any type to be stored in it by using a channel
+// of `interface{}`. This means that a call to Put() incurs an extra memory
+// allocation, and also that users need a type assertion while reading. For
+// performance critical code paths, using Unbounded is strongly discouraged and
+// defining a new type specific implementation of this buffer is preferred. See
+// internal/transport/transport.go for an example of this.
+type Unbounded struct {
+	c       chan interface{}
+	mu      sync.Mutex
+	backlog []interface{}
+}
+
+// NewUnbounded returns a new instance of Unbounded.
+func NewUnbounded() *Unbounded {
+	return &Unbounded{c: make(chan interface{}, 1)}
+}
+
+// Put adds t to the unbounded buffer.
+func (b *Unbounded) Put(t interface{}) {
+	b.mu.Lock()
+	if len(b.backlog) == 0 {
+		select {
+		case b.c <- t:
+			b.mu.Unlock()
+			return
+		default:
+		}
+	}
+	b.backlog = append(b.backlog, t)
+	b.mu.Unlock()
+}
+
+// Load sends the earliest buffered data, if any, onto the read channel
+// returned by Get(). Users are expected to call this every time they read a
+// value from the read channel.
+func (b *Unbounded) Load() {
+	b.mu.Lock()
+	if len(b.backlog) > 0 {
+		select {
+		case b.c <- b.backlog[0]:
+			b.backlog[0] = nil
+			b.backlog = b.backlog[1:]
+		default:
+		}
+	}
+	b.mu.Unlock()
+}
+
+// Get returns a read channel on which values added to the buffer, via Put(),
+// are sent on.
+//
+// Upon reading a value from this channel, users are expected to call Load() to
+// send the next buffered value onto the channel if there is any.
+func (b *Unbounded) Get() <-chan interface{} {
+	return b.c
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/funcs.go b/vendor/google.golang.org/grpc/internal/channelz/funcs.go
new file mode 100644
index 0000000..f0744f9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/funcs.go
@@ -0,0 +1,727 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package channelz defines APIs for enabling channelz service, entry
+// registration/deletion, and accessing channelz data. It also defines channelz
+// metric struct formats.
+//
+// All APIs in this package are experimental.
+package channelz
+
+import (
+	"fmt"
+	"sort"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+const (
+	defaultMaxTraceEntry int32 = 30
+)
+
+var (
+	db    dbWrapper
+	idGen idGenerator
+	// EntryPerPage defines the number of channelz entries to be shown on a web page.
+	EntryPerPage  = int64(50)
+	curState      int32
+	maxTraceEntry = defaultMaxTraceEntry
+)
+
+// TurnOn turns on channelz data collection.
+func TurnOn() {
+	if !IsOn() {
+		NewChannelzStorage()
+		atomic.StoreInt32(&curState, 1)
+	}
+}
+
+// IsOn returns whether channelz data collection is on.
+func IsOn() bool {
+	return atomic.CompareAndSwapInt32(&curState, 1, 1)
+}
+
+// SetMaxTraceEntry sets maximum number of trace entry per entity (i.e. channel/subchannel).
+// Setting it to 0 will disable channel tracing.
+func SetMaxTraceEntry(i int32) {
+	atomic.StoreInt32(&maxTraceEntry, i)
+}
+
+// ResetMaxTraceEntryToDefault resets the maximum number of trace entry per entity to default.
+func ResetMaxTraceEntryToDefault() {
+	atomic.StoreInt32(&maxTraceEntry, defaultMaxTraceEntry)
+}
+
+func getMaxTraceEntry() int {
+	i := atomic.LoadInt32(&maxTraceEntry)
+	return int(i)
+}
+
+// dbWarpper wraps around a reference to internal channelz data storage, and
+// provide synchronized functionality to set and get the reference.
+type dbWrapper struct {
+	mu sync.RWMutex
+	DB *channelMap
+}
+
+func (d *dbWrapper) set(db *channelMap) {
+	d.mu.Lock()
+	d.DB = db
+	d.mu.Unlock()
+}
+
+func (d *dbWrapper) get() *channelMap {
+	d.mu.RLock()
+	defer d.mu.RUnlock()
+	return d.DB
+}
+
+// NewChannelzStorage initializes channelz data storage and id generator.
+//
+// This function returns a cleanup function to wait for all channelz state to be reset by the
+// grpc goroutines when those entities get closed. By using this cleanup function, we make sure tests
+// don't mess up each other, i.e. lingering goroutine from previous test doing entity removal happen
+// to remove some entity just register by the new test, since the id space is the same.
+//
+// Note: This function is exported for testing purpose only. User should not call
+// it in most cases.
+func NewChannelzStorage() (cleanup func() error) {
+	db.set(&channelMap{
+		topLevelChannels: make(map[int64]struct{}),
+		channels:         make(map[int64]*channel),
+		listenSockets:    make(map[int64]*listenSocket),
+		normalSockets:    make(map[int64]*normalSocket),
+		servers:          make(map[int64]*server),
+		subChannels:      make(map[int64]*subChannel),
+	})
+	idGen.reset()
+	return func() error {
+		var err error
+		cm := db.get()
+		if cm == nil {
+			return nil
+		}
+		for i := 0; i < 1000; i++ {
+			cm.mu.Lock()
+			if len(cm.topLevelChannels) == 0 && len(cm.servers) == 0 && len(cm.channels) == 0 && len(cm.subChannels) == 0 && len(cm.listenSockets) == 0 && len(cm.normalSockets) == 0 {
+				cm.mu.Unlock()
+				// all things stored in the channelz map have been cleared.
+				return nil
+			}
+			cm.mu.Unlock()
+			time.Sleep(10 * time.Millisecond)
+		}
+
+		cm.mu.Lock()
+		err = fmt.Errorf("after 10s the channelz map has not been cleaned up yet, topchannels: %d, servers: %d, channels: %d, subchannels: %d, listen sockets: %d, normal sockets: %d", len(cm.topLevelChannels), len(cm.servers), len(cm.channels), len(cm.subChannels), len(cm.listenSockets), len(cm.normalSockets))
+		cm.mu.Unlock()
+		return err
+	}
+}
+
+// GetTopChannels returns a slice of top channel's ChannelMetric, along with a
+// boolean indicating whether there's more top channels to be queried for.
+//
+// The arg id specifies that only top channel with id at or above it will be included
+// in the result. The returned slice is up to a length of the arg maxResults or
+// EntryPerPage if maxResults is zero, and is sorted in ascending id order.
+func GetTopChannels(id int64, maxResults int64) ([]*ChannelMetric, bool) {
+	return db.get().GetTopChannels(id, maxResults)
+}
+
+// GetServers returns a slice of server's ServerMetric, along with a
+// boolean indicating whether there's more servers to be queried for.
+//
+// The arg id specifies that only server with id at or above it will be included
+// in the result. The returned slice is up to a length of the arg maxResults or
+// EntryPerPage if maxResults is zero, and is sorted in ascending id order.
+func GetServers(id int64, maxResults int64) ([]*ServerMetric, bool) {
+	return db.get().GetServers(id, maxResults)
+}
+
+// GetServerSockets returns a slice of server's (identified by id) normal socket's
+// SocketMetric, along with a boolean indicating whether there's more sockets to
+// be queried for.
+//
+// The arg startID specifies that only sockets with id at or above it will be
+// included in the result. The returned slice is up to a length of the arg maxResults
+// or EntryPerPage if maxResults is zero, and is sorted in ascending id order.
+func GetServerSockets(id int64, startID int64, maxResults int64) ([]*SocketMetric, bool) {
+	return db.get().GetServerSockets(id, startID, maxResults)
+}
+
+// GetChannel returns the ChannelMetric for the channel (identified by id).
+func GetChannel(id int64) *ChannelMetric {
+	return db.get().GetChannel(id)
+}
+
+// GetSubChannel returns the SubChannelMetric for the subchannel (identified by id).
+func GetSubChannel(id int64) *SubChannelMetric {
+	return db.get().GetSubChannel(id)
+}
+
+// GetSocket returns the SocketInternalMetric for the socket (identified by id).
+func GetSocket(id int64) *SocketMetric {
+	return db.get().GetSocket(id)
+}
+
+// GetServer returns the ServerMetric for the server (identified by id).
+func GetServer(id int64) *ServerMetric {
+	return db.get().GetServer(id)
+}
+
+// RegisterChannel registers the given channel c in channelz database with ref
+// as its reference name, and add it to the child list of its parent (identified
+// by pid). pid = 0 means no parent. It returns the unique channelz tracking id
+// assigned to this channel.
+func RegisterChannel(c Channel, pid int64, ref string) int64 {
+	id := idGen.genID()
+	cn := &channel{
+		refName:     ref,
+		c:           c,
+		subChans:    make(map[int64]string),
+		nestedChans: make(map[int64]string),
+		id:          id,
+		pid:         pid,
+		trace:       &channelTrace{createdTime: time.Now(), events: make([]*TraceEvent, 0, getMaxTraceEntry())},
+	}
+	if pid == 0 {
+		db.get().addChannel(id, cn, true, pid, ref)
+	} else {
+		db.get().addChannel(id, cn, false, pid, ref)
+	}
+	return id
+}
+
+// RegisterSubChannel registers the given channel c in channelz database with ref
+// as its reference name, and add it to the child list of its parent (identified
+// by pid). It returns the unique channelz tracking id assigned to this subchannel.
+func RegisterSubChannel(c Channel, pid int64, ref string) int64 {
+	if pid == 0 {
+		grpclog.Error("a SubChannel's parent id cannot be 0")
+		return 0
+	}
+	id := idGen.genID()
+	sc := &subChannel{
+		refName: ref,
+		c:       c,
+		sockets: make(map[int64]string),
+		id:      id,
+		pid:     pid,
+		trace:   &channelTrace{createdTime: time.Now(), events: make([]*TraceEvent, 0, getMaxTraceEntry())},
+	}
+	db.get().addSubChannel(id, sc, pid, ref)
+	return id
+}
+
+// RegisterServer registers the given server s in channelz database. It returns
+// the unique channelz tracking id assigned to this server.
+func RegisterServer(s Server, ref string) int64 {
+	id := idGen.genID()
+	svr := &server{
+		refName:       ref,
+		s:             s,
+		sockets:       make(map[int64]string),
+		listenSockets: make(map[int64]string),
+		id:            id,
+	}
+	db.get().addServer(id, svr)
+	return id
+}
+
+// RegisterListenSocket registers the given listen socket s in channelz database
+// with ref as its reference name, and add it to the child list of its parent
+// (identified by pid). It returns the unique channelz tracking id assigned to
+// this listen socket.
+func RegisterListenSocket(s Socket, pid int64, ref string) int64 {
+	if pid == 0 {
+		grpclog.Error("a ListenSocket's parent id cannot be 0")
+		return 0
+	}
+	id := idGen.genID()
+	ls := &listenSocket{refName: ref, s: s, id: id, pid: pid}
+	db.get().addListenSocket(id, ls, pid, ref)
+	return id
+}
+
+// RegisterNormalSocket registers the given normal socket s in channelz database
+// with ref as its reference name, and add it to the child list of its parent
+// (identified by pid). It returns the unique channelz tracking id assigned to
+// this normal socket.
+func RegisterNormalSocket(s Socket, pid int64, ref string) int64 {
+	if pid == 0 {
+		grpclog.Error("a NormalSocket's parent id cannot be 0")
+		return 0
+	}
+	id := idGen.genID()
+	ns := &normalSocket{refName: ref, s: s, id: id, pid: pid}
+	db.get().addNormalSocket(id, ns, pid, ref)
+	return id
+}
+
+// RemoveEntry removes an entry with unique channelz trakcing id to be id from
+// channelz database.
+func RemoveEntry(id int64) {
+	db.get().removeEntry(id)
+}
+
+// TraceEventDesc is what the caller of AddTraceEvent should provide to describe the event to be added
+// to the channel trace.
+// The Parent field is optional. It is used for event that will be recorded in the entity's parent
+// trace also.
+type TraceEventDesc struct {
+	Desc     string
+	Severity Severity
+	Parent   *TraceEventDesc
+}
+
+// AddTraceEvent adds trace related to the entity with specified id, using the provided TraceEventDesc.
+func AddTraceEvent(id int64, desc *TraceEventDesc) {
+	if getMaxTraceEntry() == 0 {
+		return
+	}
+	db.get().traceEvent(id, desc)
+}
+
+// channelMap is the storage data structure for channelz.
+// Methods of channelMap can be divided in two two categories with respect to locking.
+// 1. Methods acquire the global lock.
+// 2. Methods that can only be called when global lock is held.
+// A second type of method need always to be called inside a first type of method.
+type channelMap struct {
+	mu               sync.RWMutex
+	topLevelChannels map[int64]struct{}
+	servers          map[int64]*server
+	channels         map[int64]*channel
+	subChannels      map[int64]*subChannel
+	listenSockets    map[int64]*listenSocket
+	normalSockets    map[int64]*normalSocket
+}
+
+func (c *channelMap) addServer(id int64, s *server) {
+	c.mu.Lock()
+	s.cm = c
+	c.servers[id] = s
+	c.mu.Unlock()
+}
+
+func (c *channelMap) addChannel(id int64, cn *channel, isTopChannel bool, pid int64, ref string) {
+	c.mu.Lock()
+	cn.cm = c
+	cn.trace.cm = c
+	c.channels[id] = cn
+	if isTopChannel {
+		c.topLevelChannels[id] = struct{}{}
+	} else {
+		c.findEntry(pid).addChild(id, cn)
+	}
+	c.mu.Unlock()
+}
+
+func (c *channelMap) addSubChannel(id int64, sc *subChannel, pid int64, ref string) {
+	c.mu.Lock()
+	sc.cm = c
+	sc.trace.cm = c
+	c.subChannels[id] = sc
+	c.findEntry(pid).addChild(id, sc)
+	c.mu.Unlock()
+}
+
+func (c *channelMap) addListenSocket(id int64, ls *listenSocket, pid int64, ref string) {
+	c.mu.Lock()
+	ls.cm = c
+	c.listenSockets[id] = ls
+	c.findEntry(pid).addChild(id, ls)
+	c.mu.Unlock()
+}
+
+func (c *channelMap) addNormalSocket(id int64, ns *normalSocket, pid int64, ref string) {
+	c.mu.Lock()
+	ns.cm = c
+	c.normalSockets[id] = ns
+	c.findEntry(pid).addChild(id, ns)
+	c.mu.Unlock()
+}
+
+// removeEntry triggers the removal of an entry, which may not indeed delete the entry, if it has to
+// wait on the deletion of its children and until no other entity's channel trace references it.
+// It may lead to a chain of entry deletion. For example, deleting the last socket of a gracefully
+// shutting down server will lead to the server being also deleted.
+func (c *channelMap) removeEntry(id int64) {
+	c.mu.Lock()
+	c.findEntry(id).triggerDelete()
+	c.mu.Unlock()
+}
+
+// c.mu must be held by the caller
+func (c *channelMap) decrTraceRefCount(id int64) {
+	e := c.findEntry(id)
+	if v, ok := e.(tracedChannel); ok {
+		v.decrTraceRefCount()
+		e.deleteSelfIfReady()
+	}
+}
+
+// c.mu must be held by the caller.
+func (c *channelMap) findEntry(id int64) entry {
+	var v entry
+	var ok bool
+	if v, ok = c.channels[id]; ok {
+		return v
+	}
+	if v, ok = c.subChannels[id]; ok {
+		return v
+	}
+	if v, ok = c.servers[id]; ok {
+		return v
+	}
+	if v, ok = c.listenSockets[id]; ok {
+		return v
+	}
+	if v, ok = c.normalSockets[id]; ok {
+		return v
+	}
+	return &dummyEntry{idNotFound: id}
+}
+
+// c.mu must be held by the caller
+// deleteEntry simply deletes an entry from the channelMap. Before calling this
+// method, caller must check this entry is ready to be deleted, i.e removeEntry()
+// has been called on it, and no children still exist.
+// Conditionals are ordered by the expected frequency of deletion of each entity
+// type, in order to optimize performance.
+func (c *channelMap) deleteEntry(id int64) {
+	var ok bool
+	if _, ok = c.normalSockets[id]; ok {
+		delete(c.normalSockets, id)
+		return
+	}
+	if _, ok = c.subChannels[id]; ok {
+		delete(c.subChannels, id)
+		return
+	}
+	if _, ok = c.channels[id]; ok {
+		delete(c.channels, id)
+		delete(c.topLevelChannels, id)
+		return
+	}
+	if _, ok = c.listenSockets[id]; ok {
+		delete(c.listenSockets, id)
+		return
+	}
+	if _, ok = c.servers[id]; ok {
+		delete(c.servers, id)
+		return
+	}
+}
+
+func (c *channelMap) traceEvent(id int64, desc *TraceEventDesc) {
+	c.mu.Lock()
+	child := c.findEntry(id)
+	childTC, ok := child.(tracedChannel)
+	if !ok {
+		c.mu.Unlock()
+		return
+	}
+	childTC.getChannelTrace().append(&TraceEvent{Desc: desc.Desc, Severity: desc.Severity, Timestamp: time.Now()})
+	if desc.Parent != nil {
+		parent := c.findEntry(child.getParentID())
+		var chanType RefChannelType
+		switch child.(type) {
+		case *channel:
+			chanType = RefChannel
+		case *subChannel:
+			chanType = RefSubChannel
+		}
+		if parentTC, ok := parent.(tracedChannel); ok {
+			parentTC.getChannelTrace().append(&TraceEvent{
+				Desc:      desc.Parent.Desc,
+				Severity:  desc.Parent.Severity,
+				Timestamp: time.Now(),
+				RefID:     id,
+				RefName:   childTC.getRefName(),
+				RefType:   chanType,
+			})
+			childTC.incrTraceRefCount()
+		}
+	}
+	c.mu.Unlock()
+}
+
+type int64Slice []int64
+
+func (s int64Slice) Len() int           { return len(s) }
+func (s int64Slice) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+func (s int64Slice) Less(i, j int) bool { return s[i] < s[j] }
+
+func copyMap(m map[int64]string) map[int64]string {
+	n := make(map[int64]string)
+	for k, v := range m {
+		n[k] = v
+	}
+	return n
+}
+
+func min(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func (c *channelMap) GetTopChannels(id int64, maxResults int64) ([]*ChannelMetric, bool) {
+	if maxResults <= 0 {
+		maxResults = EntryPerPage
+	}
+	c.mu.RLock()
+	l := int64(len(c.topLevelChannels))
+	ids := make([]int64, 0, l)
+	cns := make([]*channel, 0, min(l, maxResults))
+
+	for k := range c.topLevelChannels {
+		ids = append(ids, k)
+	}
+	sort.Sort(int64Slice(ids))
+	idx := sort.Search(len(ids), func(i int) bool { return ids[i] >= id })
+	count := int64(0)
+	var end bool
+	var t []*ChannelMetric
+	for i, v := range ids[idx:] {
+		if count == maxResults {
+			break
+		}
+		if cn, ok := c.channels[v]; ok {
+			cns = append(cns, cn)
+			t = append(t, &ChannelMetric{
+				NestedChans: copyMap(cn.nestedChans),
+				SubChans:    copyMap(cn.subChans),
+			})
+			count++
+		}
+		if i == len(ids[idx:])-1 {
+			end = true
+			break
+		}
+	}
+	c.mu.RUnlock()
+	if count == 0 {
+		end = true
+	}
+
+	for i, cn := range cns {
+		t[i].ChannelData = cn.c.ChannelzMetric()
+		t[i].ID = cn.id
+		t[i].RefName = cn.refName
+		t[i].Trace = cn.trace.dumpData()
+	}
+	return t, end
+}
+
+func (c *channelMap) GetServers(id, maxResults int64) ([]*ServerMetric, bool) {
+	if maxResults <= 0 {
+		maxResults = EntryPerPage
+	}
+	c.mu.RLock()
+	l := int64(len(c.servers))
+	ids := make([]int64, 0, l)
+	ss := make([]*server, 0, min(l, maxResults))
+	for k := range c.servers {
+		ids = append(ids, k)
+	}
+	sort.Sort(int64Slice(ids))
+	idx := sort.Search(len(ids), func(i int) bool { return ids[i] >= id })
+	count := int64(0)
+	var end bool
+	var s []*ServerMetric
+	for i, v := range ids[idx:] {
+		if count == maxResults {
+			break
+		}
+		if svr, ok := c.servers[v]; ok {
+			ss = append(ss, svr)
+			s = append(s, &ServerMetric{
+				ListenSockets: copyMap(svr.listenSockets),
+			})
+			count++
+		}
+		if i == len(ids[idx:])-1 {
+			end = true
+			break
+		}
+	}
+	c.mu.RUnlock()
+	if count == 0 {
+		end = true
+	}
+
+	for i, svr := range ss {
+		s[i].ServerData = svr.s.ChannelzMetric()
+		s[i].ID = svr.id
+		s[i].RefName = svr.refName
+	}
+	return s, end
+}
+
+func (c *channelMap) GetServerSockets(id int64, startID int64, maxResults int64) ([]*SocketMetric, bool) {
+	if maxResults <= 0 {
+		maxResults = EntryPerPage
+	}
+	var svr *server
+	var ok bool
+	c.mu.RLock()
+	if svr, ok = c.servers[id]; !ok {
+		// server with id doesn't exist.
+		c.mu.RUnlock()
+		return nil, true
+	}
+	svrskts := svr.sockets
+	l := int64(len(svrskts))
+	ids := make([]int64, 0, l)
+	sks := make([]*normalSocket, 0, min(l, maxResults))
+	for k := range svrskts {
+		ids = append(ids, k)
+	}
+	sort.Sort(int64Slice(ids))
+	idx := sort.Search(len(ids), func(i int) bool { return ids[i] >= startID })
+	count := int64(0)
+	var end bool
+	for i, v := range ids[idx:] {
+		if count == maxResults {
+			break
+		}
+		if ns, ok := c.normalSockets[v]; ok {
+			sks = append(sks, ns)
+			count++
+		}
+		if i == len(ids[idx:])-1 {
+			end = true
+			break
+		}
+	}
+	c.mu.RUnlock()
+	if count == 0 {
+		end = true
+	}
+	var s []*SocketMetric
+	for _, ns := range sks {
+		sm := &SocketMetric{}
+		sm.SocketData = ns.s.ChannelzMetric()
+		sm.ID = ns.id
+		sm.RefName = ns.refName
+		s = append(s, sm)
+	}
+	return s, end
+}
+
+func (c *channelMap) GetChannel(id int64) *ChannelMetric {
+	cm := &ChannelMetric{}
+	var cn *channel
+	var ok bool
+	c.mu.RLock()
+	if cn, ok = c.channels[id]; !ok {
+		// channel with id doesn't exist.
+		c.mu.RUnlock()
+		return nil
+	}
+	cm.NestedChans = copyMap(cn.nestedChans)
+	cm.SubChans = copyMap(cn.subChans)
+	// cn.c can be set to &dummyChannel{} when deleteSelfFromMap is called. Save a copy of cn.c when
+	// holding the lock to prevent potential data race.
+	chanCopy := cn.c
+	c.mu.RUnlock()
+	cm.ChannelData = chanCopy.ChannelzMetric()
+	cm.ID = cn.id
+	cm.RefName = cn.refName
+	cm.Trace = cn.trace.dumpData()
+	return cm
+}
+
+func (c *channelMap) GetSubChannel(id int64) *SubChannelMetric {
+	cm := &SubChannelMetric{}
+	var sc *subChannel
+	var ok bool
+	c.mu.RLock()
+	if sc, ok = c.subChannels[id]; !ok {
+		// subchannel with id doesn't exist.
+		c.mu.RUnlock()
+		return nil
+	}
+	cm.Sockets = copyMap(sc.sockets)
+	// sc.c can be set to &dummyChannel{} when deleteSelfFromMap is called. Save a copy of sc.c when
+	// holding the lock to prevent potential data race.
+	chanCopy := sc.c
+	c.mu.RUnlock()
+	cm.ChannelData = chanCopy.ChannelzMetric()
+	cm.ID = sc.id
+	cm.RefName = sc.refName
+	cm.Trace = sc.trace.dumpData()
+	return cm
+}
+
+func (c *channelMap) GetSocket(id int64) *SocketMetric {
+	sm := &SocketMetric{}
+	c.mu.RLock()
+	if ls, ok := c.listenSockets[id]; ok {
+		c.mu.RUnlock()
+		sm.SocketData = ls.s.ChannelzMetric()
+		sm.ID = ls.id
+		sm.RefName = ls.refName
+		return sm
+	}
+	if ns, ok := c.normalSockets[id]; ok {
+		c.mu.RUnlock()
+		sm.SocketData = ns.s.ChannelzMetric()
+		sm.ID = ns.id
+		sm.RefName = ns.refName
+		return sm
+	}
+	c.mu.RUnlock()
+	return nil
+}
+
+func (c *channelMap) GetServer(id int64) *ServerMetric {
+	sm := &ServerMetric{}
+	var svr *server
+	var ok bool
+	c.mu.RLock()
+	if svr, ok = c.servers[id]; !ok {
+		c.mu.RUnlock()
+		return nil
+	}
+	sm.ListenSockets = copyMap(svr.listenSockets)
+	c.mu.RUnlock()
+	sm.ID = svr.id
+	sm.RefName = svr.refName
+	sm.ServerData = svr.s.ChannelzMetric()
+	return sm
+}
+
+type idGenerator struct {
+	id int64
+}
+
+func (i *idGenerator) reset() {
+	atomic.StoreInt64(&i.id, 0)
+}
+
+func (i *idGenerator) genID() int64 {
+	return atomic.AddInt64(&i.id, 1)
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/types.go b/vendor/google.golang.org/grpc/internal/channelz/types.go
new file mode 100644
index 0000000..17c2274
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/types.go
@@ -0,0 +1,702 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+import (
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+)
+
+// entry represents a node in the channelz database.
+type entry interface {
+	// addChild adds a child e, whose channelz id is id to child list
+	addChild(id int64, e entry)
+	// deleteChild deletes a child with channelz id to be id from child list
+	deleteChild(id int64)
+	// triggerDelete tries to delete self from channelz database. However, if child
+	// list is not empty, then deletion from the database is on hold until the last
+	// child is deleted from database.
+	triggerDelete()
+	// deleteSelfIfReady check whether triggerDelete() has been called before, and whether child
+	// list is now empty. If both conditions are met, then delete self from database.
+	deleteSelfIfReady()
+	// getParentID returns parent ID of the entry. 0 value parent ID means no parent.
+	getParentID() int64
+}
+
+// dummyEntry is a fake entry to handle entry not found case.
+type dummyEntry struct {
+	idNotFound int64
+}
+
+func (d *dummyEntry) addChild(id int64, e entry) {
+	// Note: It is possible for a normal program to reach here under race condition.
+	// For example, there could be a race between ClientConn.Close() info being propagated
+	// to addrConn and http2Client. ClientConn.Close() cancel the context and result
+	// in http2Client to error. The error info is then caught by transport monitor
+	// and before addrConn.tearDown() is called in side ClientConn.Close(). Therefore,
+	// the addrConn will create a new transport. And when registering the new transport in
+	// channelz, its parent addrConn could have already been torn down and deleted
+	// from channelz tracking, and thus reach the code here.
+	grpclog.Infof("attempt to add child of type %T with id %d to a parent (id=%d) that doesn't currently exist", e, id, d.idNotFound)
+}
+
+func (d *dummyEntry) deleteChild(id int64) {
+	// It is possible for a normal program to reach here under race condition.
+	// Refer to the example described in addChild().
+	grpclog.Infof("attempt to delete child with id %d from a parent (id=%d) that doesn't currently exist", id, d.idNotFound)
+}
+
+func (d *dummyEntry) triggerDelete() {
+	grpclog.Warningf("attempt to delete an entry (id=%d) that doesn't currently exist", d.idNotFound)
+}
+
+func (*dummyEntry) deleteSelfIfReady() {
+	// code should not reach here. deleteSelfIfReady is always called on an existing entry.
+}
+
+func (*dummyEntry) getParentID() int64 {
+	return 0
+}
+
+// ChannelMetric defines the info channelz provides for a specific Channel, which
+// includes ChannelInternalMetric and channelz-specific data, such as channelz id,
+// child list, etc.
+type ChannelMetric struct {
+	// ID is the channelz id of this channel.
+	ID int64
+	// RefName is the human readable reference string of this channel.
+	RefName string
+	// ChannelData contains channel internal metric reported by the channel through
+	// ChannelzMetric().
+	ChannelData *ChannelInternalMetric
+	// NestedChans tracks the nested channel type children of this channel in the format of
+	// a map from nested channel channelz id to corresponding reference string.
+	NestedChans map[int64]string
+	// SubChans tracks the subchannel type children of this channel in the format of a
+	// map from subchannel channelz id to corresponding reference string.
+	SubChans map[int64]string
+	// Sockets tracks the socket type children of this channel in the format of a map
+	// from socket channelz id to corresponding reference string.
+	// Note current grpc implementation doesn't allow channel having sockets directly,
+	// therefore, this is field is unused.
+	Sockets map[int64]string
+	// Trace contains the most recent traced events.
+	Trace *ChannelTrace
+}
+
+// SubChannelMetric defines the info channelz provides for a specific SubChannel,
+// which includes ChannelInternalMetric and channelz-specific data, such as
+// channelz id, child list, etc.
+type SubChannelMetric struct {
+	// ID is the channelz id of this subchannel.
+	ID int64
+	// RefName is the human readable reference string of this subchannel.
+	RefName string
+	// ChannelData contains subchannel internal metric reported by the subchannel
+	// through ChannelzMetric().
+	ChannelData *ChannelInternalMetric
+	// NestedChans tracks the nested channel type children of this subchannel in the format of
+	// a map from nested channel channelz id to corresponding reference string.
+	// Note current grpc implementation doesn't allow subchannel to have nested channels
+	// as children, therefore, this field is unused.
+	NestedChans map[int64]string
+	// SubChans tracks the subchannel type children of this subchannel in the format of a
+	// map from subchannel channelz id to corresponding reference string.
+	// Note current grpc implementation doesn't allow subchannel to have subchannels
+	// as children, therefore, this field is unused.
+	SubChans map[int64]string
+	// Sockets tracks the socket type children of this subchannel in the format of a map
+	// from socket channelz id to corresponding reference string.
+	Sockets map[int64]string
+	// Trace contains the most recent traced events.
+	Trace *ChannelTrace
+}
+
+// ChannelInternalMetric defines the struct that the implementor of Channel interface
+// should return from ChannelzMetric().
+type ChannelInternalMetric struct {
+	// current connectivity state of the channel.
+	State connectivity.State
+	// The target this channel originally tried to connect to.  May be absent
+	Target string
+	// The number of calls started on the channel.
+	CallsStarted int64
+	// The number of calls that have completed with an OK status.
+	CallsSucceeded int64
+	// The number of calls that have a completed with a non-OK status.
+	CallsFailed int64
+	// The last time a call was started on the channel.
+	LastCallStartedTimestamp time.Time
+}
+
+// ChannelTrace stores traced events on a channel/subchannel and related info.
+type ChannelTrace struct {
+	// EventNum is the number of events that ever got traced (i.e. including those that have been deleted)
+	EventNum int64
+	// CreationTime is the creation time of the trace.
+	CreationTime time.Time
+	// Events stores the most recent trace events (up to $maxTraceEntry, newer event will overwrite the
+	// oldest one)
+	Events []*TraceEvent
+}
+
+// TraceEvent represent a single trace event
+type TraceEvent struct {
+	// Desc is a simple description of the trace event.
+	Desc string
+	// Severity states the severity of this trace event.
+	Severity Severity
+	// Timestamp is the event time.
+	Timestamp time.Time
+	// RefID is the id of the entity that gets referenced in the event. RefID is 0 if no other entity is
+	// involved in this event.
+	// e.g. SubChannel (id: 4[]) Created. --> RefID = 4, RefName = "" (inside [])
+	RefID int64
+	// RefName is the reference name for the entity that gets referenced in the event.
+	RefName string
+	// RefType indicates the referenced entity type, i.e Channel or SubChannel.
+	RefType RefChannelType
+}
+
+// Channel is the interface that should be satisfied in order to be tracked by
+// channelz as Channel or SubChannel.
+type Channel interface {
+	ChannelzMetric() *ChannelInternalMetric
+}
+
+type dummyChannel struct{}
+
+func (d *dummyChannel) ChannelzMetric() *ChannelInternalMetric {
+	return &ChannelInternalMetric{}
+}
+
+type channel struct {
+	refName     string
+	c           Channel
+	closeCalled bool
+	nestedChans map[int64]string
+	subChans    map[int64]string
+	id          int64
+	pid         int64
+	cm          *channelMap
+	trace       *channelTrace
+	// traceRefCount is the number of trace events that reference this channel.
+	// Non-zero traceRefCount means the trace of this channel cannot be deleted.
+	traceRefCount int32
+}
+
+func (c *channel) addChild(id int64, e entry) {
+	switch v := e.(type) {
+	case *subChannel:
+		c.subChans[id] = v.refName
+	case *channel:
+		c.nestedChans[id] = v.refName
+	default:
+		grpclog.Errorf("cannot add a child (id = %d) of type %T to a channel", id, e)
+	}
+}
+
+func (c *channel) deleteChild(id int64) {
+	delete(c.subChans, id)
+	delete(c.nestedChans, id)
+	c.deleteSelfIfReady()
+}
+
+func (c *channel) triggerDelete() {
+	c.closeCalled = true
+	c.deleteSelfIfReady()
+}
+
+func (c *channel) getParentID() int64 {
+	return c.pid
+}
+
+// deleteSelfFromTree tries to delete the channel from the channelz entry relation tree, which means
+// deleting the channel reference from its parent's child list.
+//
+// In order for a channel to be deleted from the tree, it must meet the criteria that, removal of the
+// corresponding grpc object has been invoked, and the channel does not have any children left.
+//
+// The returned boolean value indicates whether the channel has been successfully deleted from tree.
+func (c *channel) deleteSelfFromTree() (deleted bool) {
+	if !c.closeCalled || len(c.subChans)+len(c.nestedChans) != 0 {
+		return false
+	}
+	// not top channel
+	if c.pid != 0 {
+		c.cm.findEntry(c.pid).deleteChild(c.id)
+	}
+	return true
+}
+
+// deleteSelfFromMap checks whether it is valid to delete the channel from the map, which means
+// deleting the channel from channelz's tracking entirely. Users can no longer use id to query the
+// channel, and its memory will be garbage collected.
+//
+// The trace reference count of the channel must be 0 in order to be deleted from the map. This is
+// specified in the channel tracing gRFC that as long as some other trace has reference to an entity,
+// the trace of the referenced entity must not be deleted. In order to release the resource allocated
+// by grpc, the reference to the grpc object is reset to a dummy object.
+//
+// deleteSelfFromMap must be called after deleteSelfFromTree returns true.
+//
+// It returns a bool to indicate whether the channel can be safely deleted from map.
+func (c *channel) deleteSelfFromMap() (delete bool) {
+	if c.getTraceRefCount() != 0 {
+		c.c = &dummyChannel{}
+		return false
+	}
+	return true
+}
+
+// deleteSelfIfReady tries to delete the channel itself from the channelz database.
+// The delete process includes two steps:
+// 1. delete the channel from the entry relation tree, i.e. delete the channel reference from its
+//    parent's child list.
+// 2. delete the channel from the map, i.e. delete the channel entirely from channelz. Lookup by id
+//    will return entry not found error.
+func (c *channel) deleteSelfIfReady() {
+	if !c.deleteSelfFromTree() {
+		return
+	}
+	if !c.deleteSelfFromMap() {
+		return
+	}
+	c.cm.deleteEntry(c.id)
+	c.trace.clear()
+}
+
+func (c *channel) getChannelTrace() *channelTrace {
+	return c.trace
+}
+
+func (c *channel) incrTraceRefCount() {
+	atomic.AddInt32(&c.traceRefCount, 1)
+}
+
+func (c *channel) decrTraceRefCount() {
+	atomic.AddInt32(&c.traceRefCount, -1)
+}
+
+func (c *channel) getTraceRefCount() int {
+	i := atomic.LoadInt32(&c.traceRefCount)
+	return int(i)
+}
+
+func (c *channel) getRefName() string {
+	return c.refName
+}
+
+type subChannel struct {
+	refName       string
+	c             Channel
+	closeCalled   bool
+	sockets       map[int64]string
+	id            int64
+	pid           int64
+	cm            *channelMap
+	trace         *channelTrace
+	traceRefCount int32
+}
+
+func (sc *subChannel) addChild(id int64, e entry) {
+	if v, ok := e.(*normalSocket); ok {
+		sc.sockets[id] = v.refName
+	} else {
+		grpclog.Errorf("cannot add a child (id = %d) of type %T to a subChannel", id, e)
+	}
+}
+
+func (sc *subChannel) deleteChild(id int64) {
+	delete(sc.sockets, id)
+	sc.deleteSelfIfReady()
+}
+
+func (sc *subChannel) triggerDelete() {
+	sc.closeCalled = true
+	sc.deleteSelfIfReady()
+}
+
+func (sc *subChannel) getParentID() int64 {
+	return sc.pid
+}
+
+// deleteSelfFromTree tries to delete the subchannel from the channelz entry relation tree, which
+// means deleting the subchannel reference from its parent's child list.
+//
+// In order for a subchannel to be deleted from the tree, it must meet the criteria that, removal of
+// the corresponding grpc object has been invoked, and the subchannel does not have any children left.
+//
+// The returned boolean value indicates whether the channel has been successfully deleted from tree.
+func (sc *subChannel) deleteSelfFromTree() (deleted bool) {
+	if !sc.closeCalled || len(sc.sockets) != 0 {
+		return false
+	}
+	sc.cm.findEntry(sc.pid).deleteChild(sc.id)
+	return true
+}
+
+// deleteSelfFromMap checks whether it is valid to delete the subchannel from the map, which means
+// deleting the subchannel from channelz's tracking entirely. Users can no longer use id to query
+// the subchannel, and its memory will be garbage collected.
+//
+// The trace reference count of the subchannel must be 0 in order to be deleted from the map. This is
+// specified in the channel tracing gRFC that as long as some other trace has reference to an entity,
+// the trace of the referenced entity must not be deleted. In order to release the resource allocated
+// by grpc, the reference to the grpc object is reset to a dummy object.
+//
+// deleteSelfFromMap must be called after deleteSelfFromTree returns true.
+//
+// It returns a bool to indicate whether the channel can be safely deleted from map.
+func (sc *subChannel) deleteSelfFromMap() (delete bool) {
+	if sc.getTraceRefCount() != 0 {
+		// free the grpc struct (i.e. addrConn)
+		sc.c = &dummyChannel{}
+		return false
+	}
+	return true
+}
+
+// deleteSelfIfReady tries to delete the subchannel itself from the channelz database.
+// The delete process includes two steps:
+// 1. delete the subchannel from the entry relation tree, i.e. delete the subchannel reference from
+//    its parent's child list.
+// 2. delete the subchannel from the map, i.e. delete the subchannel entirely from channelz. Lookup
+//    by id will return entry not found error.
+func (sc *subChannel) deleteSelfIfReady() {
+	if !sc.deleteSelfFromTree() {
+		return
+	}
+	if !sc.deleteSelfFromMap() {
+		return
+	}
+	sc.cm.deleteEntry(sc.id)
+	sc.trace.clear()
+}
+
+func (sc *subChannel) getChannelTrace() *channelTrace {
+	return sc.trace
+}
+
+func (sc *subChannel) incrTraceRefCount() {
+	atomic.AddInt32(&sc.traceRefCount, 1)
+}
+
+func (sc *subChannel) decrTraceRefCount() {
+	atomic.AddInt32(&sc.traceRefCount, -1)
+}
+
+func (sc *subChannel) getTraceRefCount() int {
+	i := atomic.LoadInt32(&sc.traceRefCount)
+	return int(i)
+}
+
+func (sc *subChannel) getRefName() string {
+	return sc.refName
+}
+
+// SocketMetric defines the info channelz provides for a specific Socket, which
+// includes SocketInternalMetric and channelz-specific data, such as channelz id, etc.
+type SocketMetric struct {
+	// ID is the channelz id of this socket.
+	ID int64
+	// RefName is the human readable reference string of this socket.
+	RefName string
+	// SocketData contains socket internal metric reported by the socket through
+	// ChannelzMetric().
+	SocketData *SocketInternalMetric
+}
+
+// SocketInternalMetric defines the struct that the implementor of Socket interface
+// should return from ChannelzMetric().
+type SocketInternalMetric struct {
+	// The number of streams that have been started.
+	StreamsStarted int64
+	// The number of streams that have ended successfully:
+	// On client side, receiving frame with eos bit set.
+	// On server side, sending frame with eos bit set.
+	StreamsSucceeded int64
+	// The number of streams that have ended unsuccessfully:
+	// On client side, termination without receiving frame with eos bit set.
+	// On server side, termination without sending frame with eos bit set.
+	StreamsFailed int64
+	// The number of messages successfully sent on this socket.
+	MessagesSent     int64
+	MessagesReceived int64
+	// The number of keep alives sent.  This is typically implemented with HTTP/2
+	// ping messages.
+	KeepAlivesSent int64
+	// The last time a stream was created by this endpoint.  Usually unset for
+	// servers.
+	LastLocalStreamCreatedTimestamp time.Time
+	// The last time a stream was created by the remote endpoint.  Usually unset
+	// for clients.
+	LastRemoteStreamCreatedTimestamp time.Time
+	// The last time a message was sent by this endpoint.
+	LastMessageSentTimestamp time.Time
+	// The last time a message was received by this endpoint.
+	LastMessageReceivedTimestamp time.Time
+	// The amount of window, granted to the local endpoint by the remote endpoint.
+	// This may be slightly out of date due to network latency.  This does NOT
+	// include stream level or TCP level flow control info.
+	LocalFlowControlWindow int64
+	// The amount of window, granted to the remote endpoint by the local endpoint.
+	// This may be slightly out of date due to network latency.  This does NOT
+	// include stream level or TCP level flow control info.
+	RemoteFlowControlWindow int64
+	// The locally bound address.
+	LocalAddr net.Addr
+	// The remote bound address.  May be absent.
+	RemoteAddr net.Addr
+	// Optional, represents the name of the remote endpoint, if different than
+	// the original target name.
+	RemoteName    string
+	SocketOptions *SocketOptionData
+	Security      credentials.ChannelzSecurityValue
+}
+
+// Socket is the interface that should be satisfied in order to be tracked by
+// channelz as Socket.
+type Socket interface {
+	ChannelzMetric() *SocketInternalMetric
+}
+
+type listenSocket struct {
+	refName string
+	s       Socket
+	id      int64
+	pid     int64
+	cm      *channelMap
+}
+
+func (ls *listenSocket) addChild(id int64, e entry) {
+	grpclog.Errorf("cannot add a child (id = %d) of type %T to a listen socket", id, e)
+}
+
+func (ls *listenSocket) deleteChild(id int64) {
+	grpclog.Errorf("cannot delete a child (id = %d) from a listen socket", id)
+}
+
+func (ls *listenSocket) triggerDelete() {
+	ls.cm.deleteEntry(ls.id)
+	ls.cm.findEntry(ls.pid).deleteChild(ls.id)
+}
+
+func (ls *listenSocket) deleteSelfIfReady() {
+	grpclog.Errorf("cannot call deleteSelfIfReady on a listen socket")
+}
+
+func (ls *listenSocket) getParentID() int64 {
+	return ls.pid
+}
+
+type normalSocket struct {
+	refName string
+	s       Socket
+	id      int64
+	pid     int64
+	cm      *channelMap
+}
+
+func (ns *normalSocket) addChild(id int64, e entry) {
+	grpclog.Errorf("cannot add a child (id = %d) of type %T to a normal socket", id, e)
+}
+
+func (ns *normalSocket) deleteChild(id int64) {
+	grpclog.Errorf("cannot delete a child (id = %d) from a normal socket", id)
+}
+
+func (ns *normalSocket) triggerDelete() {
+	ns.cm.deleteEntry(ns.id)
+	ns.cm.findEntry(ns.pid).deleteChild(ns.id)
+}
+
+func (ns *normalSocket) deleteSelfIfReady() {
+	grpclog.Errorf("cannot call deleteSelfIfReady on a normal socket")
+}
+
+func (ns *normalSocket) getParentID() int64 {
+	return ns.pid
+}
+
+// ServerMetric defines the info channelz provides for a specific Server, which
+// includes ServerInternalMetric and channelz-specific data, such as channelz id,
+// child list, etc.
+type ServerMetric struct {
+	// ID is the channelz id of this server.
+	ID int64
+	// RefName is the human readable reference string of this server.
+	RefName string
+	// ServerData contains server internal metric reported by the server through
+	// ChannelzMetric().
+	ServerData *ServerInternalMetric
+	// ListenSockets tracks the listener socket type children of this server in the
+	// format of a map from socket channelz id to corresponding reference string.
+	ListenSockets map[int64]string
+}
+
+// ServerInternalMetric defines the struct that the implementor of Server interface
+// should return from ChannelzMetric().
+type ServerInternalMetric struct {
+	// The number of incoming calls started on the server.
+	CallsStarted int64
+	// The number of incoming calls that have completed with an OK status.
+	CallsSucceeded int64
+	// The number of incoming calls that have a completed with a non-OK status.
+	CallsFailed int64
+	// The last time a call was started on the server.
+	LastCallStartedTimestamp time.Time
+}
+
+// Server is the interface to be satisfied in order to be tracked by channelz as
+// Server.
+type Server interface {
+	ChannelzMetric() *ServerInternalMetric
+}
+
+type server struct {
+	refName       string
+	s             Server
+	closeCalled   bool
+	sockets       map[int64]string
+	listenSockets map[int64]string
+	id            int64
+	cm            *channelMap
+}
+
+func (s *server) addChild(id int64, e entry) {
+	switch v := e.(type) {
+	case *normalSocket:
+		s.sockets[id] = v.refName
+	case *listenSocket:
+		s.listenSockets[id] = v.refName
+	default:
+		grpclog.Errorf("cannot add a child (id = %d) of type %T to a server", id, e)
+	}
+}
+
+func (s *server) deleteChild(id int64) {
+	delete(s.sockets, id)
+	delete(s.listenSockets, id)
+	s.deleteSelfIfReady()
+}
+
+func (s *server) triggerDelete() {
+	s.closeCalled = true
+	s.deleteSelfIfReady()
+}
+
+func (s *server) deleteSelfIfReady() {
+	if !s.closeCalled || len(s.sockets)+len(s.listenSockets) != 0 {
+		return
+	}
+	s.cm.deleteEntry(s.id)
+}
+
+func (s *server) getParentID() int64 {
+	return 0
+}
+
+type tracedChannel interface {
+	getChannelTrace() *channelTrace
+	incrTraceRefCount()
+	decrTraceRefCount()
+	getRefName() string
+}
+
+type channelTrace struct {
+	cm          *channelMap
+	createdTime time.Time
+	eventCount  int64
+	mu          sync.Mutex
+	events      []*TraceEvent
+}
+
+func (c *channelTrace) append(e *TraceEvent) {
+	c.mu.Lock()
+	if len(c.events) == getMaxTraceEntry() {
+		del := c.events[0]
+		c.events = c.events[1:]
+		if del.RefID != 0 {
+			// start recursive cleanup in a goroutine to not block the call originated from grpc.
+			go func() {
+				// need to acquire c.cm.mu lock to call the unlocked attemptCleanup func.
+				c.cm.mu.Lock()
+				c.cm.decrTraceRefCount(del.RefID)
+				c.cm.mu.Unlock()
+			}()
+		}
+	}
+	e.Timestamp = time.Now()
+	c.events = append(c.events, e)
+	c.eventCount++
+	c.mu.Unlock()
+}
+
+func (c *channelTrace) clear() {
+	c.mu.Lock()
+	for _, e := range c.events {
+		if e.RefID != 0 {
+			// caller should have already held the c.cm.mu lock.
+			c.cm.decrTraceRefCount(e.RefID)
+		}
+	}
+	c.mu.Unlock()
+}
+
+// Severity is the severity level of a trace event.
+// The canonical enumeration of all valid values is here:
+// https://github.com/grpc/grpc-proto/blob/9b13d199cc0d4703c7ea26c9c330ba695866eb23/grpc/channelz/v1/channelz.proto#L126.
+type Severity int
+
+const (
+	// CtUNKNOWN indicates unknown severity of a trace event.
+	CtUNKNOWN Severity = iota
+	// CtINFO indicates info level severity of a trace event.
+	CtINFO
+	// CtWarning indicates warning level severity of a trace event.
+	CtWarning
+	// CtError indicates error level severity of a trace event.
+	CtError
+)
+
+// RefChannelType is the type of the entity being referenced in a trace event.
+type RefChannelType int
+
+const (
+	// RefChannel indicates the referenced entity is a Channel.
+	RefChannel RefChannelType = iota
+	// RefSubChannel indicates the referenced entity is a SubChannel.
+	RefSubChannel
+)
+
+func (c *channelTrace) dumpData() *ChannelTrace {
+	c.mu.Lock()
+	ct := &ChannelTrace{EventNum: c.eventCount, CreationTime: c.createdTime}
+	ct.Events = c.events[:len(c.events)]
+	c.mu.Unlock()
+	return ct
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/types_linux.go b/vendor/google.golang.org/grpc/internal/channelz/types_linux.go
new file mode 100644
index 0000000..692dd61
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/types_linux.go
@@ -0,0 +1,53 @@
+// +build !appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+// SocketOptionData defines the struct to hold socket option data, and related
+// getter function to obtain info from fd.
+type SocketOptionData struct {
+	Linger      *unix.Linger
+	RecvTimeout *unix.Timeval
+	SendTimeout *unix.Timeval
+	TCPInfo     *unix.TCPInfo
+}
+
+// Getsockopt defines the function to get socket options requested by channelz.
+// It is to be passed to syscall.RawConn.Control().
+func (s *SocketOptionData) Getsockopt(fd uintptr) {
+	if v, err := unix.GetsockoptLinger(int(fd), syscall.SOL_SOCKET, syscall.SO_LINGER); err == nil {
+		s.Linger = v
+	}
+	if v, err := unix.GetsockoptTimeval(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVTIMEO); err == nil {
+		s.RecvTimeout = v
+	}
+	if v, err := unix.GetsockoptTimeval(int(fd), syscall.SOL_SOCKET, syscall.SO_SNDTIMEO); err == nil {
+		s.SendTimeout = v
+	}
+	if v, err := unix.GetsockoptTCPInfo(int(fd), syscall.SOL_TCP, syscall.TCP_INFO); err == nil {
+		s.TCPInfo = v
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/types_nonlinux.go b/vendor/google.golang.org/grpc/internal/channelz/types_nonlinux.go
new file mode 100644
index 0000000..79edbef
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/types_nonlinux.go
@@ -0,0 +1,44 @@
+// +build !linux appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+import (
+	"sync"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+var once sync.Once
+
+// SocketOptionData defines the struct to hold socket option data, and related
+// getter function to obtain info from fd.
+// Windows OS doesn't support Socket Option
+type SocketOptionData struct {
+}
+
+// Getsockopt defines the function to get socket options requested by channelz.
+// It is to be passed to syscall.RawConn.Control().
+// Windows OS doesn't support Socket Option
+func (s *SocketOptionData) Getsockopt(fd uintptr) {
+	once.Do(func() {
+		grpclog.Warningln("Channelz: socket options are not supported on non-linux os and appengine.")
+	})
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/util_linux.go b/vendor/google.golang.org/grpc/internal/channelz/util_linux.go
new file mode 100644
index 0000000..fdf409d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/util_linux.go
@@ -0,0 +1,39 @@
+// +build linux,!appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+import (
+	"syscall"
+)
+
+// GetSocketOption gets the socket option info of the conn.
+func GetSocketOption(socket interface{}) *SocketOptionData {
+	c, ok := socket.(syscall.Conn)
+	if !ok {
+		return nil
+	}
+	data := &SocketOptionData{}
+	if rawConn, err := c.SyscallConn(); err == nil {
+		rawConn.Control(data.Getsockopt)
+		return data
+	}
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/util_nonlinux.go b/vendor/google.golang.org/grpc/internal/channelz/util_nonlinux.go
new file mode 100644
index 0000000..8864a08
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/channelz/util_nonlinux.go
@@ -0,0 +1,26 @@
+// +build !linux appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package channelz
+
+// GetSocketOption gets the socket option info of the conn.
+func GetSocketOption(c interface{}) *SocketOptionData {
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
new file mode 100644
index 0000000..3ee8740
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
@@ -0,0 +1,35 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package envconfig contains grpc settings configured by environment variables.
+package envconfig
+
+import (
+	"os"
+	"strings"
+)
+
+const (
+	prefix   = "GRPC_GO_"
+	retryStr = prefix + "RETRY"
+)
+
+var (
+	// Retry is set if retry is explicitly enabled via "GRPC_GO_RETRY=on".
+	Retry = strings.EqualFold(os.Getenv(retryStr), "on")
+)
diff --git a/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go b/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go
new file mode 100644
index 0000000..200b115
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go
@@ -0,0 +1,56 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package grpcrand implements math/rand functions in a concurrent-safe way
+// with a global random source, independent of math/rand's global source.
+package grpcrand
+
+import (
+	"math/rand"
+	"sync"
+	"time"
+)
+
+var (
+	r  = rand.New(rand.NewSource(time.Now().UnixNano()))
+	mu sync.Mutex
+)
+
+// Int63n implements rand.Int63n on the grpcrand global source.
+func Int63n(n int64) int64 {
+	mu.Lock()
+	res := r.Int63n(n)
+	mu.Unlock()
+	return res
+}
+
+// Intn implements rand.Intn on the grpcrand global source.
+func Intn(n int) int {
+	mu.Lock()
+	res := r.Intn(n)
+	mu.Unlock()
+	return res
+}
+
+// Float64 implements rand.Float64 on the grpcrand global source.
+func Float64() float64 {
+	mu.Lock()
+	res := r.Float64()
+	mu.Unlock()
+	return res
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcsync/event.go b/vendor/google.golang.org/grpc/internal/grpcsync/event.go
new file mode 100644
index 0000000..fbe697c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcsync/event.go
@@ -0,0 +1,61 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package grpcsync implements additional synchronization primitives built upon
+// the sync package.
+package grpcsync
+
+import (
+	"sync"
+	"sync/atomic"
+)
+
+// Event represents a one-time event that may occur in the future.
+type Event struct {
+	fired int32
+	c     chan struct{}
+	o     sync.Once
+}
+
+// Fire causes e to complete.  It is safe to call multiple times, and
+// concurrently.  It returns true iff this call to Fire caused the signaling
+// channel returned by Done to close.
+func (e *Event) Fire() bool {
+	ret := false
+	e.o.Do(func() {
+		atomic.StoreInt32(&e.fired, 1)
+		close(e.c)
+		ret = true
+	})
+	return ret
+}
+
+// Done returns a channel that will be closed when Fire is called.
+func (e *Event) Done() <-chan struct{} {
+	return e.c
+}
+
+// HasFired returns true if Fire has been called.
+func (e *Event) HasFired() bool {
+	return atomic.LoadInt32(&e.fired) == 1
+}
+
+// NewEvent returns a new, ready-to-use Event.
+func NewEvent() *Event {
+	return &Event{c: make(chan struct{})}
+}
diff --git a/vendor/google.golang.org/grpc/internal/internal.go b/vendor/google.golang.org/grpc/internal/internal.go
new file mode 100644
index 0000000..eae18e1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package internal contains gRPC-internal code, to avoid polluting
+// the godoc of the top-level grpc package.  It must not import any grpc
+// symbols to avoid circular dependencies.
+package internal
+
+import (
+	"context"
+	"time"
+
+	"google.golang.org/grpc/connectivity"
+)
+
+var (
+	// WithResolverBuilder is set by dialoptions.go
+	WithResolverBuilder interface{} // func (resolver.Builder) grpc.DialOption
+	// WithHealthCheckFunc is set by dialoptions.go
+	WithHealthCheckFunc interface{} // func (HealthChecker) DialOption
+	// HealthCheckFunc is used to provide client-side LB channel health checking
+	HealthCheckFunc HealthChecker
+	// BalancerUnregister is exported by package balancer to unregister a balancer.
+	BalancerUnregister func(name string)
+	// KeepaliveMinPingTime is the minimum ping interval.  This must be 10s by
+	// default, but tests may wish to set it lower for convenience.
+	KeepaliveMinPingTime = 10 * time.Second
+	// StatusRawProto is exported by status/status.go. This func returns a
+	// pointer to the wrapped Status proto for a given status.Status without a
+	// call to proto.Clone(). The returned Status proto should not be mutated by
+	// the caller.
+	StatusRawProto interface{} // func (*status.Status) *spb.Status
+	// NewRequestInfoContext creates a new context based on the argument context attaching
+	// the passed in RequestInfo to the new context.
+	NewRequestInfoContext interface{} // func(context.Context, credentials.RequestInfo) context.Context
+	// ParseServiceConfigForTesting is for creating a fake
+	// ClientConn for resolver testing only
+	ParseServiceConfigForTesting interface{} // func(string) *serviceconfig.ParseResult
+)
+
+// HealthChecker defines the signature of the client-side LB channel health checking function.
+//
+// The implementation is expected to create a health checking RPC stream by
+// calling newStream(), watch for the health status of serviceName, and report
+// it's health back by calling setConnectivityState().
+//
+// The health checking protocol is defined at:
+// https://github.com/grpc/grpc/blob/master/doc/health-checking.md
+type HealthChecker func(ctx context.Context, newStream func(string) (interface{}, error), setConnectivityState func(connectivity.State, error), serviceName string) error
+
+const (
+	// CredsBundleModeFallback switches GoogleDefaultCreds to fallback mode.
+	CredsBundleModeFallback = "fallback"
+	// CredsBundleModeBalancer switches GoogleDefaultCreds to grpclb balancer
+	// mode.
+	CredsBundleModeBalancer = "balancer"
+	// CredsBundleModeBackendFromBalancer switches GoogleDefaultCreds to mode
+	// that supports backend returned by grpclb balancer.
+	CredsBundleModeBackendFromBalancer = "backend-from-balancer"
+)
diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
new file mode 100644
index 0000000..7705ca2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
@@ -0,0 +1,420 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package dns implements a dns resolver to be installed as the default resolver
+// in grpc.
+package dns
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+// EnableSRVLookups controls whether the DNS resolver attempts to fetch gRPCLB
+// addresses from SRV records.  Must not be changed after init time.
+var EnableSRVLookups = false
+
+func init() {
+	resolver.Register(NewBuilder())
+}
+
+const (
+	defaultPort       = "443"
+	defaultDNSSvrPort = "53"
+	golang            = "GO"
+	// txtPrefix is the prefix string to be prepended to the host name for txt record lookup.
+	txtPrefix = "_grpc_config."
+	// In DNS, service config is encoded in a TXT record via the mechanism
+	// described in RFC-1464 using the attribute name grpc_config.
+	txtAttribute = "grpc_config="
+)
+
+var (
+	errMissingAddr = errors.New("dns resolver: missing address")
+
+	// Addresses ending with a colon that is supposed to be the separator
+	// between host and port is not allowed.  E.g. "::" is a valid address as
+	// it is an IPv6 address (host only) and "[::]:" is invalid as it ends with
+	// a colon as the host and port separator
+	errEndsWithColon = errors.New("dns resolver: missing port after port-separator colon")
+)
+
+var (
+	defaultResolver netResolver = net.DefaultResolver
+	// To prevent excessive re-resolution, we enforce a rate limit on DNS
+	// resolution requests.
+	minDNSResRate = 30 * time.Second
+)
+
+var customAuthorityDialler = func(authority string) func(ctx context.Context, network, address string) (net.Conn, error) {
+	return func(ctx context.Context, network, address string) (net.Conn, error) {
+		var dialer net.Dialer
+		return dialer.DialContext(ctx, network, authority)
+	}
+}
+
+var customAuthorityResolver = func(authority string) (netResolver, error) {
+	host, port, err := parseTarget(authority, defaultDNSSvrPort)
+	if err != nil {
+		return nil, err
+	}
+
+	authorityWithPort := net.JoinHostPort(host, port)
+
+	return &net.Resolver{
+		PreferGo: true,
+		Dial:     customAuthorityDialler(authorityWithPort),
+	}, nil
+}
+
+// NewBuilder creates a dnsBuilder which is used to factory DNS resolvers.
+func NewBuilder() resolver.Builder {
+	return &dnsBuilder{}
+}
+
+type dnsBuilder struct{}
+
+// Build creates and starts a DNS resolver that watches the name resolution of the target.
+func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
+	host, port, err := parseTarget(target.Endpoint, defaultPort)
+	if err != nil {
+		return nil, err
+	}
+
+	// IP address.
+	if ipAddr, ok := formatIP(host); ok {
+		addr := []resolver.Address{{Addr: ipAddr + ":" + port}}
+		cc.UpdateState(resolver.State{Addresses: addr})
+		return deadResolver{}, nil
+	}
+
+	// DNS address (non-IP).
+	ctx, cancel := context.WithCancel(context.Background())
+	d := &dnsResolver{
+		host:                 host,
+		port:                 port,
+		ctx:                  ctx,
+		cancel:               cancel,
+		cc:                   cc,
+		rn:                   make(chan struct{}, 1),
+		disableServiceConfig: opts.DisableServiceConfig,
+	}
+
+	if target.Authority == "" {
+		d.resolver = defaultResolver
+	} else {
+		d.resolver, err = customAuthorityResolver(target.Authority)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	d.wg.Add(1)
+	go d.watcher()
+	d.ResolveNow(resolver.ResolveNowOptions{})
+	return d, nil
+}
+
+// Scheme returns the naming scheme of this resolver builder, which is "dns".
+func (b *dnsBuilder) Scheme() string {
+	return "dns"
+}
+
+type netResolver interface {
+	LookupHost(ctx context.Context, host string) (addrs []string, err error)
+	LookupSRV(ctx context.Context, service, proto, name string) (cname string, addrs []*net.SRV, err error)
+	LookupTXT(ctx context.Context, name string) (txts []string, err error)
+}
+
+// deadResolver is a resolver that does nothing.
+type deadResolver struct{}
+
+func (deadResolver) ResolveNow(resolver.ResolveNowOptions) {}
+
+func (deadResolver) Close() {}
+
+// dnsResolver watches for the name resolution update for a non-IP target.
+type dnsResolver struct {
+	host     string
+	port     string
+	resolver netResolver
+	ctx      context.Context
+	cancel   context.CancelFunc
+	cc       resolver.ClientConn
+	// rn channel is used by ResolveNow() to force an immediate resolution of the target.
+	rn chan struct{}
+	// wg is used to enforce Close() to return after the watcher() goroutine has finished.
+	// Otherwise, data race will be possible. [Race Example] in dns_resolver_test we
+	// replace the real lookup functions with mocked ones to facilitate testing.
+	// If Close() doesn't wait for watcher() goroutine finishes, race detector sometimes
+	// will warns lookup (READ the lookup function pointers) inside watcher() goroutine
+	// has data race with replaceNetFunc (WRITE the lookup function pointers).
+	wg                   sync.WaitGroup
+	disableServiceConfig bool
+}
+
+// ResolveNow invoke an immediate resolution of the target that this dnsResolver watches.
+func (d *dnsResolver) ResolveNow(resolver.ResolveNowOptions) {
+	select {
+	case d.rn <- struct{}{}:
+	default:
+	}
+}
+
+// Close closes the dnsResolver.
+func (d *dnsResolver) Close() {
+	d.cancel()
+	d.wg.Wait()
+}
+
+func (d *dnsResolver) watcher() {
+	defer d.wg.Done()
+	for {
+		select {
+		case <-d.ctx.Done():
+			return
+		case <-d.rn:
+		}
+
+		state := d.lookup()
+		d.cc.UpdateState(*state)
+
+		// Sleep to prevent excessive re-resolutions. Incoming resolution requests
+		// will be queued in d.rn.
+		t := time.NewTimer(minDNSResRate)
+		select {
+		case <-t.C:
+		case <-d.ctx.Done():
+			t.Stop()
+			return
+		}
+	}
+}
+
+func (d *dnsResolver) lookupSRV() []resolver.Address {
+	if !EnableSRVLookups {
+		return nil
+	}
+	var newAddrs []resolver.Address
+	_, srvs, err := d.resolver.LookupSRV(d.ctx, "grpclb", "tcp", d.host)
+	if err != nil {
+		grpclog.Infof("grpc: failed dns SRV record lookup due to %v.\n", err)
+		return nil
+	}
+	for _, s := range srvs {
+		lbAddrs, err := d.resolver.LookupHost(d.ctx, s.Target)
+		if err != nil {
+			grpclog.Infof("grpc: failed load balancer address dns lookup due to %v.\n", err)
+			continue
+		}
+		for _, a := range lbAddrs {
+			a, ok := formatIP(a)
+			if !ok {
+				grpclog.Errorf("grpc: failed IP parsing due to %v.\n", err)
+				continue
+			}
+			addr := a + ":" + strconv.Itoa(int(s.Port))
+			newAddrs = append(newAddrs, resolver.Address{Addr: addr, Type: resolver.GRPCLB, ServerName: s.Target})
+		}
+	}
+	return newAddrs
+}
+
+var filterError = func(err error) error {
+	if dnsErr, ok := err.(*net.DNSError); ok && !dnsErr.IsTimeout && !dnsErr.IsTemporary {
+		// Timeouts and temporary errors should be communicated to gRPC to
+		// attempt another DNS query (with backoff).  Other errors should be
+		// suppressed (they may represent the absence of a TXT record).
+		return nil
+	}
+	return err
+}
+
+func (d *dnsResolver) lookupTXT() *serviceconfig.ParseResult {
+	ss, err := d.resolver.LookupTXT(d.ctx, txtPrefix+d.host)
+	if err != nil {
+		err = filterError(err)
+		if err != nil {
+			err = fmt.Errorf("error from DNS TXT record lookup: %v", err)
+			grpclog.Infoln("grpc:", err)
+			return &serviceconfig.ParseResult{Err: err}
+		}
+		return nil
+	}
+	var res string
+	for _, s := range ss {
+		res += s
+	}
+
+	// TXT record must have "grpc_config=" attribute in order to be used as service config.
+	if !strings.HasPrefix(res, txtAttribute) {
+		grpclog.Warningf("grpc: DNS TXT record %v missing %v attribute", res, txtAttribute)
+		// This is not an error; it is the equivalent of not having a service config.
+		return nil
+	}
+	sc := canaryingSC(strings.TrimPrefix(res, txtAttribute))
+	return d.cc.ParseServiceConfig(sc)
+}
+
+func (d *dnsResolver) lookupHost() []resolver.Address {
+	var newAddrs []resolver.Address
+	addrs, err := d.resolver.LookupHost(d.ctx, d.host)
+	if err != nil {
+		grpclog.Warningf("grpc: failed dns A record lookup due to %v.\n", err)
+		return nil
+	}
+	for _, a := range addrs {
+		a, ok := formatIP(a)
+		if !ok {
+			grpclog.Errorf("grpc: failed IP parsing due to %v.\n", err)
+			continue
+		}
+		addr := a + ":" + d.port
+		newAddrs = append(newAddrs, resolver.Address{Addr: addr})
+	}
+	return newAddrs
+}
+
+func (d *dnsResolver) lookup() *resolver.State {
+	srv := d.lookupSRV()
+	state := &resolver.State{
+		Addresses: append(d.lookupHost(), srv...),
+	}
+	if !d.disableServiceConfig {
+		state.ServiceConfig = d.lookupTXT()
+	}
+	return state
+}
+
+// formatIP returns ok = false if addr is not a valid textual representation of an IP address.
+// If addr is an IPv4 address, return the addr and ok = true.
+// If addr is an IPv6 address, return the addr enclosed in square brackets and ok = true.
+func formatIP(addr string) (addrIP string, ok bool) {
+	ip := net.ParseIP(addr)
+	if ip == nil {
+		return "", false
+	}
+	if ip.To4() != nil {
+		return addr, true
+	}
+	return "[" + addr + "]", true
+}
+
+// parseTarget takes the user input target string and default port, returns formatted host and port info.
+// If target doesn't specify a port, set the port to be the defaultPort.
+// If target is in IPv6 format and host-name is enclosed in square brackets, brackets
+// are stripped when setting the host.
+// examples:
+// target: "www.google.com" defaultPort: "443" returns host: "www.google.com", port: "443"
+// target: "ipv4-host:80" defaultPort: "443" returns host: "ipv4-host", port: "80"
+// target: "[ipv6-host]" defaultPort: "443" returns host: "ipv6-host", port: "443"
+// target: ":80" defaultPort: "443" returns host: "localhost", port: "80"
+func parseTarget(target, defaultPort string) (host, port string, err error) {
+	if target == "" {
+		return "", "", errMissingAddr
+	}
+	if ip := net.ParseIP(target); ip != nil {
+		// target is an IPv4 or IPv6(without brackets) address
+		return target, defaultPort, nil
+	}
+	if host, port, err = net.SplitHostPort(target); err == nil {
+		if port == "" {
+			// If the port field is empty (target ends with colon), e.g. "[::1]:", this is an error.
+			return "", "", errEndsWithColon
+		}
+		// target has port, i.e ipv4-host:port, [ipv6-host]:port, host-name:port
+		if host == "" {
+			// Keep consistent with net.Dial(): If the host is empty, as in ":80", the local system is assumed.
+			host = "localhost"
+		}
+		return host, port, nil
+	}
+	if host, port, err = net.SplitHostPort(target + ":" + defaultPort); err == nil {
+		// target doesn't have port
+		return host, port, nil
+	}
+	return "", "", fmt.Errorf("invalid target address %v, error info: %v", target, err)
+}
+
+type rawChoice struct {
+	ClientLanguage *[]string        `json:"clientLanguage,omitempty"`
+	Percentage     *int             `json:"percentage,omitempty"`
+	ClientHostName *[]string        `json:"clientHostName,omitempty"`
+	ServiceConfig  *json.RawMessage `json:"serviceConfig,omitempty"`
+}
+
+func containsString(a *[]string, b string) bool {
+	if a == nil {
+		return true
+	}
+	for _, c := range *a {
+		if c == b {
+			return true
+		}
+	}
+	return false
+}
+
+func chosenByPercentage(a *int) bool {
+	if a == nil {
+		return true
+	}
+	return grpcrand.Intn(100)+1 <= *a
+}
+
+func canaryingSC(js string) string {
+	if js == "" {
+		return ""
+	}
+	var rcs []rawChoice
+	err := json.Unmarshal([]byte(js), &rcs)
+	if err != nil {
+		grpclog.Warningf("grpc: failed to parse service config json string due to %v.\n", err)
+		return ""
+	}
+	cliHostname, err := os.Hostname()
+	if err != nil {
+		grpclog.Warningf("grpc: failed to get client hostname due to %v.\n", err)
+		return ""
+	}
+	var sc string
+	for _, c := range rcs {
+		if !containsString(c.ClientLanguage, golang) ||
+			!chosenByPercentage(c.Percentage) ||
+			!containsString(c.ClientHostName, cliHostname) ||
+			c.ServiceConfig == nil {
+			continue
+		}
+		sc = string(*c.ServiceConfig)
+		break
+	}
+	return sc
+}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/go113.go b/vendor/google.golang.org/grpc/internal/resolver/dns/go113.go
new file mode 100644
index 0000000..8783a8c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/resolver/dns/go113.go
@@ -0,0 +1,33 @@
+// +build go1.13
+
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package dns
+
+import "net"
+
+func init() {
+	filterError = func(err error) error {
+		if dnsErr, ok := err.(*net.DNSError); ok && dnsErr.IsNotFound {
+			// The name does not exist; not an error.
+			return nil
+		}
+		return err
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go b/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go
new file mode 100644
index 0000000..520d922
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go
@@ -0,0 +1,57 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package passthrough implements a pass-through resolver. It sends the target
+// name without scheme back to gRPC as resolved address.
+package passthrough
+
+import "google.golang.org/grpc/resolver"
+
+const scheme = "passthrough"
+
+type passthroughBuilder struct{}
+
+func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
+	r := &passthroughResolver{
+		target: target,
+		cc:     cc,
+	}
+	r.start()
+	return r, nil
+}
+
+func (*passthroughBuilder) Scheme() string {
+	return scheme
+}
+
+type passthroughResolver struct {
+	target resolver.Target
+	cc     resolver.ClientConn
+}
+
+func (r *passthroughResolver) start() {
+	r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint}}})
+}
+
+func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOptions) {}
+
+func (*passthroughResolver) Close() {}
+
+func init() {
+	resolver.Register(&passthroughBuilder{})
+}
diff --git a/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go b/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go
new file mode 100644
index 0000000..43281a3
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/syscall/syscall_linux.go
@@ -0,0 +1,114 @@
+// +build !appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package syscall provides functionalities that grpc uses to get low-level operating system
+// stats/info.
+package syscall
+
+import (
+	"fmt"
+	"net"
+	"syscall"
+	"time"
+
+	"golang.org/x/sys/unix"
+	"google.golang.org/grpc/grpclog"
+)
+
+// GetCPUTime returns the how much CPU time has passed since the start of this process.
+func GetCPUTime() int64 {
+	var ts unix.Timespec
+	if err := unix.ClockGettime(unix.CLOCK_PROCESS_CPUTIME_ID, &ts); err != nil {
+		grpclog.Fatal(err)
+	}
+	return ts.Nano()
+}
+
+// Rusage is an alias for syscall.Rusage under linux non-appengine environment.
+type Rusage syscall.Rusage
+
+// GetRusage returns the resource usage of current process.
+func GetRusage() (rusage *Rusage) {
+	rusage = new(Rusage)
+	syscall.Getrusage(syscall.RUSAGE_SELF, (*syscall.Rusage)(rusage))
+	return
+}
+
+// CPUTimeDiff returns the differences of user CPU time and system CPU time used
+// between two Rusage structs.
+func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
+	f := (*syscall.Rusage)(first)
+	l := (*syscall.Rusage)(latest)
+	var (
+		utimeDiffs  = l.Utime.Sec - f.Utime.Sec
+		utimeDiffus = l.Utime.Usec - f.Utime.Usec
+		stimeDiffs  = l.Stime.Sec - f.Stime.Sec
+		stimeDiffus = l.Stime.Usec - f.Stime.Usec
+	)
+
+	uTimeElapsed := float64(utimeDiffs) + float64(utimeDiffus)*1.0e-6
+	sTimeElapsed := float64(stimeDiffs) + float64(stimeDiffus)*1.0e-6
+
+	return uTimeElapsed, sTimeElapsed
+}
+
+// SetTCPUserTimeout sets the TCP user timeout on a connection's socket
+func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error {
+	tcpconn, ok := conn.(*net.TCPConn)
+	if !ok {
+		// not a TCP connection. exit early
+		return nil
+	}
+	rawConn, err := tcpconn.SyscallConn()
+	if err != nil {
+		return fmt.Errorf("error getting raw connection: %v", err)
+	}
+	err = rawConn.Control(func(fd uintptr) {
+		err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(timeout/time.Millisecond))
+	})
+	if err != nil {
+		return fmt.Errorf("error setting option on socket: %v", err)
+	}
+
+	return nil
+}
+
+// GetTCPUserTimeout gets the TCP user timeout on a connection's socket
+func GetTCPUserTimeout(conn net.Conn) (opt int, err error) {
+	tcpconn, ok := conn.(*net.TCPConn)
+	if !ok {
+		err = fmt.Errorf("conn is not *net.TCPConn. got %T", conn)
+		return
+	}
+	rawConn, err := tcpconn.SyscallConn()
+	if err != nil {
+		err = fmt.Errorf("error getting raw connection: %v", err)
+		return
+	}
+	err = rawConn.Control(func(fd uintptr) {
+		opt, err = syscall.GetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT)
+	})
+	if err != nil {
+		err = fmt.Errorf("error getting option on socket: %v", err)
+		return
+	}
+
+	return
+}
diff --git a/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go b/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go
new file mode 100644
index 0000000..d3fd9da
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/syscall/syscall_nonlinux.go
@@ -0,0 +1,73 @@
+// +build !linux appengine
+
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package syscall
+
+import (
+	"net"
+	"sync"
+	"time"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+var once sync.Once
+
+func log() {
+	once.Do(func() {
+		grpclog.Info("CPU time info is unavailable on non-linux or appengine environment.")
+	})
+}
+
+// GetCPUTime returns the how much CPU time has passed since the start of this process.
+// It always returns 0 under non-linux or appengine environment.
+func GetCPUTime() int64 {
+	log()
+	return 0
+}
+
+// Rusage is an empty struct under non-linux or appengine environment.
+type Rusage struct{}
+
+// GetRusage is a no-op function under non-linux or appengine environment.
+func GetRusage() (rusage *Rusage) {
+	log()
+	return nil
+}
+
+// CPUTimeDiff returns the differences of user CPU time and system CPU time used
+// between two Rusage structs. It a no-op function for non-linux or appengine environment.
+func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
+	log()
+	return 0, 0
+}
+
+// SetTCPUserTimeout is a no-op function under non-linux or appengine environments
+func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error {
+	log()
+	return nil
+}
+
+// GetTCPUserTimeout is a no-op function under non-linux or appengine environments
+// a negative return value indicates the operation is not supported
+func GetTCPUserTimeout(conn net.Conn) (int, error) {
+	log()
+	return -1, nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/bdp_estimator.go b/vendor/google.golang.org/grpc/internal/transport/bdp_estimator.go
new file mode 100644
index 0000000..070680e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/bdp_estimator.go
@@ -0,0 +1,141 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"sync"
+	"time"
+)
+
+const (
+	// bdpLimit is the maximum value the flow control windows will be increased
+	// to.  TCP typically limits this to 4MB, but some systems go up to 16MB.
+	// Since this is only a limit, it is safe to make it optimistic.
+	bdpLimit = (1 << 20) * 16
+	// alpha is a constant factor used to keep a moving average
+	// of RTTs.
+	alpha = 0.9
+	// If the current bdp sample is greater than or equal to
+	// our beta * our estimated bdp and the current bandwidth
+	// sample is the maximum bandwidth observed so far, we
+	// increase our bbp estimate by a factor of gamma.
+	beta = 0.66
+	// To put our bdp to be smaller than or equal to twice the real BDP,
+	// we should multiply our current sample with 4/3, however to round things out
+	// we use 2 as the multiplication factor.
+	gamma = 2
+)
+
+// Adding arbitrary data to ping so that its ack can be identified.
+// Easter-egg: what does the ping message say?
+var bdpPing = &ping{data: [8]byte{2, 4, 16, 16, 9, 14, 7, 7}}
+
+type bdpEstimator struct {
+	// sentAt is the time when the ping was sent.
+	sentAt time.Time
+
+	mu sync.Mutex
+	// bdp is the current bdp estimate.
+	bdp uint32
+	// sample is the number of bytes received in one measurement cycle.
+	sample uint32
+	// bwMax is the maximum bandwidth noted so far (bytes/sec).
+	bwMax float64
+	// bool to keep track of the beginning of a new measurement cycle.
+	isSent bool
+	// Callback to update the window sizes.
+	updateFlowControl func(n uint32)
+	// sampleCount is the number of samples taken so far.
+	sampleCount uint64
+	// round trip time (seconds)
+	rtt float64
+}
+
+// timesnap registers the time bdp ping was sent out so that
+// network rtt can be calculated when its ack is received.
+// It is called (by controller) when the bdpPing is
+// being written on the wire.
+func (b *bdpEstimator) timesnap(d [8]byte) {
+	if bdpPing.data != d {
+		return
+	}
+	b.sentAt = time.Now()
+}
+
+// add adds bytes to the current sample for calculating bdp.
+// It returns true only if a ping must be sent. This can be used
+// by the caller (handleData) to make decision about batching
+// a window update with it.
+func (b *bdpEstimator) add(n uint32) bool {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.bdp == bdpLimit {
+		return false
+	}
+	if !b.isSent {
+		b.isSent = true
+		b.sample = n
+		b.sentAt = time.Time{}
+		b.sampleCount++
+		return true
+	}
+	b.sample += n
+	return false
+}
+
+// calculate is called when an ack for a bdp ping is received.
+// Here we calculate the current bdp and bandwidth sample and
+// decide if the flow control windows should go up.
+func (b *bdpEstimator) calculate(d [8]byte) {
+	// Check if the ping acked for was the bdp ping.
+	if bdpPing.data != d {
+		return
+	}
+	b.mu.Lock()
+	rttSample := time.Since(b.sentAt).Seconds()
+	if b.sampleCount < 10 {
+		// Bootstrap rtt with an average of first 10 rtt samples.
+		b.rtt += (rttSample - b.rtt) / float64(b.sampleCount)
+	} else {
+		// Heed to the recent past more.
+		b.rtt += (rttSample - b.rtt) * float64(alpha)
+	}
+	b.isSent = false
+	// The number of bytes accumulated so far in the sample is smaller
+	// than or equal to 1.5 times the real BDP on a saturated connection.
+	bwCurrent := float64(b.sample) / (b.rtt * float64(1.5))
+	if bwCurrent > b.bwMax {
+		b.bwMax = bwCurrent
+	}
+	// If the current sample (which is smaller than or equal to the 1.5 times the real BDP) is
+	// greater than or equal to 2/3rd our perceived bdp AND this is the maximum bandwidth seen so far, we
+	// should update our perception of the network BDP.
+	if float64(b.sample) >= beta*float64(b.bdp) && bwCurrent == b.bwMax && b.bdp != bdpLimit {
+		sampleFloat := float64(b.sample)
+		b.bdp = uint32(gamma * sampleFloat)
+		if b.bdp > bdpLimit {
+			b.bdp = bdpLimit
+		}
+		bdp := b.bdp
+		b.mu.Unlock()
+		b.updateFlowControl(bdp)
+		return
+	}
+	b.mu.Unlock()
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
new file mode 100644
index 0000000..ddee20b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
@@ -0,0 +1,926 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"bytes"
+	"fmt"
+	"runtime"
+	"sync"
+	"sync/atomic"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
+)
+
+var updateHeaderTblSize = func(e *hpack.Encoder, v uint32) {
+	e.SetMaxDynamicTableSizeLimit(v)
+}
+
+type itemNode struct {
+	it   interface{}
+	next *itemNode
+}
+
+type itemList struct {
+	head *itemNode
+	tail *itemNode
+}
+
+func (il *itemList) enqueue(i interface{}) {
+	n := &itemNode{it: i}
+	if il.tail == nil {
+		il.head, il.tail = n, n
+		return
+	}
+	il.tail.next = n
+	il.tail = n
+}
+
+// peek returns the first item in the list without removing it from the
+// list.
+func (il *itemList) peek() interface{} {
+	return il.head.it
+}
+
+func (il *itemList) dequeue() interface{} {
+	if il.head == nil {
+		return nil
+	}
+	i := il.head.it
+	il.head = il.head.next
+	if il.head == nil {
+		il.tail = nil
+	}
+	return i
+}
+
+func (il *itemList) dequeueAll() *itemNode {
+	h := il.head
+	il.head, il.tail = nil, nil
+	return h
+}
+
+func (il *itemList) isEmpty() bool {
+	return il.head == nil
+}
+
+// The following defines various control items which could flow through
+// the control buffer of transport. They represent different aspects of
+// control tasks, e.g., flow control, settings, streaming resetting, etc.
+
+// maxQueuedTransportResponseFrames is the most queued "transport response"
+// frames we will buffer before preventing new reads from occurring on the
+// transport.  These are control frames sent in response to client requests,
+// such as RST_STREAM due to bad headers or settings acks.
+const maxQueuedTransportResponseFrames = 50
+
+type cbItem interface {
+	isTransportResponseFrame() bool
+}
+
+// registerStream is used to register an incoming stream with loopy writer.
+type registerStream struct {
+	streamID uint32
+	wq       *writeQuota
+}
+
+func (*registerStream) isTransportResponseFrame() bool { return false }
+
+// headerFrame is also used to register stream on the client-side.
+type headerFrame struct {
+	streamID   uint32
+	hf         []hpack.HeaderField
+	endStream  bool               // Valid on server side.
+	initStream func(uint32) error // Used only on the client side.
+	onWrite    func()
+	wq         *writeQuota    // write quota for the stream created.
+	cleanup    *cleanupStream // Valid on the server side.
+	onOrphaned func(error)    // Valid on client-side
+}
+
+func (h *headerFrame) isTransportResponseFrame() bool {
+	return h.cleanup != nil && h.cleanup.rst // Results in a RST_STREAM
+}
+
+type cleanupStream struct {
+	streamID uint32
+	rst      bool
+	rstCode  http2.ErrCode
+	onWrite  func()
+}
+
+func (c *cleanupStream) isTransportResponseFrame() bool { return c.rst } // Results in a RST_STREAM
+
+type dataFrame struct {
+	streamID  uint32
+	endStream bool
+	h         []byte
+	d         []byte
+	// onEachWrite is called every time
+	// a part of d is written out.
+	onEachWrite func()
+}
+
+func (*dataFrame) isTransportResponseFrame() bool { return false }
+
+type incomingWindowUpdate struct {
+	streamID  uint32
+	increment uint32
+}
+
+func (*incomingWindowUpdate) isTransportResponseFrame() bool { return false }
+
+type outgoingWindowUpdate struct {
+	streamID  uint32
+	increment uint32
+}
+
+func (*outgoingWindowUpdate) isTransportResponseFrame() bool {
+	return false // window updates are throttled by thresholds
+}
+
+type incomingSettings struct {
+	ss []http2.Setting
+}
+
+func (*incomingSettings) isTransportResponseFrame() bool { return true } // Results in a settings ACK
+
+type outgoingSettings struct {
+	ss []http2.Setting
+}
+
+func (*outgoingSettings) isTransportResponseFrame() bool { return false }
+
+type incomingGoAway struct {
+}
+
+func (*incomingGoAway) isTransportResponseFrame() bool { return false }
+
+type goAway struct {
+	code      http2.ErrCode
+	debugData []byte
+	headsUp   bool
+	closeConn bool
+}
+
+func (*goAway) isTransportResponseFrame() bool { return false }
+
+type ping struct {
+	ack  bool
+	data [8]byte
+}
+
+func (*ping) isTransportResponseFrame() bool { return true }
+
+type outFlowControlSizeRequest struct {
+	resp chan uint32
+}
+
+func (*outFlowControlSizeRequest) isTransportResponseFrame() bool { return false }
+
+type outStreamState int
+
+const (
+	active outStreamState = iota
+	empty
+	waitingOnStreamQuota
+)
+
+type outStream struct {
+	id               uint32
+	state            outStreamState
+	itl              *itemList
+	bytesOutStanding int
+	wq               *writeQuota
+
+	next *outStream
+	prev *outStream
+}
+
+func (s *outStream) deleteSelf() {
+	if s.prev != nil {
+		s.prev.next = s.next
+	}
+	if s.next != nil {
+		s.next.prev = s.prev
+	}
+	s.next, s.prev = nil, nil
+}
+
+type outStreamList struct {
+	// Following are sentinel objects that mark the
+	// beginning and end of the list. They do not
+	// contain any item lists. All valid objects are
+	// inserted in between them.
+	// This is needed so that an outStream object can
+	// deleteSelf() in O(1) time without knowing which
+	// list it belongs to.
+	head *outStream
+	tail *outStream
+}
+
+func newOutStreamList() *outStreamList {
+	head, tail := new(outStream), new(outStream)
+	head.next = tail
+	tail.prev = head
+	return &outStreamList{
+		head: head,
+		tail: tail,
+	}
+}
+
+func (l *outStreamList) enqueue(s *outStream) {
+	e := l.tail.prev
+	e.next = s
+	s.prev = e
+	s.next = l.tail
+	l.tail.prev = s
+}
+
+// remove from the beginning of the list.
+func (l *outStreamList) dequeue() *outStream {
+	b := l.head.next
+	if b == l.tail {
+		return nil
+	}
+	b.deleteSelf()
+	return b
+}
+
+// controlBuffer is a way to pass information to loopy.
+// Information is passed as specific struct types called control frames.
+// A control frame not only represents data, messages or headers to be sent out
+// but can also be used to instruct loopy to update its internal state.
+// It shouldn't be confused with an HTTP2 frame, although some of the control frames
+// like dataFrame and headerFrame do go out on wire as HTTP2 frames.
+type controlBuffer struct {
+	ch              chan struct{}
+	done            <-chan struct{}
+	mu              sync.Mutex
+	consumerWaiting bool
+	list            *itemList
+	err             error
+
+	// transportResponseFrames counts the number of queued items that represent
+	// the response of an action initiated by the peer.  trfChan is created
+	// when transportResponseFrames >= maxQueuedTransportResponseFrames and is
+	// closed and nilled when transportResponseFrames drops below the
+	// threshold.  Both fields are protected by mu.
+	transportResponseFrames int
+	trfChan                 atomic.Value // *chan struct{}
+}
+
+func newControlBuffer(done <-chan struct{}) *controlBuffer {
+	return &controlBuffer{
+		ch:   make(chan struct{}, 1),
+		list: &itemList{},
+		done: done,
+	}
+}
+
+// throttle blocks if there are too many incomingSettings/cleanupStreams in the
+// controlbuf.
+func (c *controlBuffer) throttle() {
+	ch, _ := c.trfChan.Load().(*chan struct{})
+	if ch != nil {
+		select {
+		case <-*ch:
+		case <-c.done:
+		}
+	}
+}
+
+func (c *controlBuffer) put(it cbItem) error {
+	_, err := c.executeAndPut(nil, it)
+	return err
+}
+
+func (c *controlBuffer) executeAndPut(f func(it interface{}) bool, it cbItem) (bool, error) {
+	var wakeUp bool
+	c.mu.Lock()
+	if c.err != nil {
+		c.mu.Unlock()
+		return false, c.err
+	}
+	if f != nil {
+		if !f(it) { // f wasn't successful
+			c.mu.Unlock()
+			return false, nil
+		}
+	}
+	if c.consumerWaiting {
+		wakeUp = true
+		c.consumerWaiting = false
+	}
+	c.list.enqueue(it)
+	if it.isTransportResponseFrame() {
+		c.transportResponseFrames++
+		if c.transportResponseFrames == maxQueuedTransportResponseFrames {
+			// We are adding the frame that puts us over the threshold; create
+			// a throttling channel.
+			ch := make(chan struct{})
+			c.trfChan.Store(&ch)
+		}
+	}
+	c.mu.Unlock()
+	if wakeUp {
+		select {
+		case c.ch <- struct{}{}:
+		default:
+		}
+	}
+	return true, nil
+}
+
+// Note argument f should never be nil.
+func (c *controlBuffer) execute(f func(it interface{}) bool, it interface{}) (bool, error) {
+	c.mu.Lock()
+	if c.err != nil {
+		c.mu.Unlock()
+		return false, c.err
+	}
+	if !f(it) { // f wasn't successful
+		c.mu.Unlock()
+		return false, nil
+	}
+	c.mu.Unlock()
+	return true, nil
+}
+
+func (c *controlBuffer) get(block bool) (interface{}, error) {
+	for {
+		c.mu.Lock()
+		if c.err != nil {
+			c.mu.Unlock()
+			return nil, c.err
+		}
+		if !c.list.isEmpty() {
+			h := c.list.dequeue().(cbItem)
+			if h.isTransportResponseFrame() {
+				if c.transportResponseFrames == maxQueuedTransportResponseFrames {
+					// We are removing the frame that put us over the
+					// threshold; close and clear the throttling channel.
+					ch := c.trfChan.Load().(*chan struct{})
+					close(*ch)
+					c.trfChan.Store((*chan struct{})(nil))
+				}
+				c.transportResponseFrames--
+			}
+			c.mu.Unlock()
+			return h, nil
+		}
+		if !block {
+			c.mu.Unlock()
+			return nil, nil
+		}
+		c.consumerWaiting = true
+		c.mu.Unlock()
+		select {
+		case <-c.ch:
+		case <-c.done:
+			c.finish()
+			return nil, ErrConnClosing
+		}
+	}
+}
+
+func (c *controlBuffer) finish() {
+	c.mu.Lock()
+	if c.err != nil {
+		c.mu.Unlock()
+		return
+	}
+	c.err = ErrConnClosing
+	// There may be headers for streams in the control buffer.
+	// These streams need to be cleaned out since the transport
+	// is still not aware of these yet.
+	for head := c.list.dequeueAll(); head != nil; head = head.next {
+		hdr, ok := head.it.(*headerFrame)
+		if !ok {
+			continue
+		}
+		if hdr.onOrphaned != nil { // It will be nil on the server-side.
+			hdr.onOrphaned(ErrConnClosing)
+		}
+	}
+	c.mu.Unlock()
+}
+
+type side int
+
+const (
+	clientSide side = iota
+	serverSide
+)
+
+// Loopy receives frames from the control buffer.
+// Each frame is handled individually; most of the work done by loopy goes
+// into handling data frames. Loopy maintains a queue of active streams, and each
+// stream maintains a queue of data frames; as loopy receives data frames
+// it gets added to the queue of the relevant stream.
+// Loopy goes over this list of active streams by processing one node every iteration,
+// thereby closely resemebling to a round-robin scheduling over all streams. While
+// processing a stream, loopy writes out data bytes from this stream capped by the min
+// of http2MaxFrameLen, connection-level flow control and stream-level flow control.
+type loopyWriter struct {
+	side      side
+	cbuf      *controlBuffer
+	sendQuota uint32
+	oiws      uint32 // outbound initial window size.
+	// estdStreams is map of all established streams that are not cleaned-up yet.
+	// On client-side, this is all streams whose headers were sent out.
+	// On server-side, this is all streams whose headers were received.
+	estdStreams map[uint32]*outStream // Established streams.
+	// activeStreams is a linked-list of all streams that have data to send and some
+	// stream-level flow control quota.
+	// Each of these streams internally have a list of data items(and perhaps trailers
+	// on the server-side) to be sent out.
+	activeStreams *outStreamList
+	framer        *framer
+	hBuf          *bytes.Buffer  // The buffer for HPACK encoding.
+	hEnc          *hpack.Encoder // HPACK encoder.
+	bdpEst        *bdpEstimator
+	draining      bool
+
+	// Side-specific handlers
+	ssGoAwayHandler func(*goAway) (bool, error)
+}
+
+func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimator) *loopyWriter {
+	var buf bytes.Buffer
+	l := &loopyWriter{
+		side:          s,
+		cbuf:          cbuf,
+		sendQuota:     defaultWindowSize,
+		oiws:          defaultWindowSize,
+		estdStreams:   make(map[uint32]*outStream),
+		activeStreams: newOutStreamList(),
+		framer:        fr,
+		hBuf:          &buf,
+		hEnc:          hpack.NewEncoder(&buf),
+		bdpEst:        bdpEst,
+	}
+	return l
+}
+
+const minBatchSize = 1000
+
+// run should be run in a separate goroutine.
+// It reads control frames from controlBuf and processes them by:
+// 1. Updating loopy's internal state, or/and
+// 2. Writing out HTTP2 frames on the wire.
+//
+// Loopy keeps all active streams with data to send in a linked-list.
+// All streams in the activeStreams linked-list must have both:
+// 1. Data to send, and
+// 2. Stream level flow control quota available.
+//
+// In each iteration of run loop, other than processing the incoming control
+// frame, loopy calls processData, which processes one node from the activeStreams linked-list.
+// This results in writing of HTTP2 frames into an underlying write buffer.
+// When there's no more control frames to read from controlBuf, loopy flushes the write buffer.
+// As an optimization, to increase the batch size for each flush, loopy yields the processor, once
+// if the batch size is too low to give stream goroutines a chance to fill it up.
+func (l *loopyWriter) run() (err error) {
+	defer func() {
+		if err == ErrConnClosing {
+			// Don't log ErrConnClosing as error since it happens
+			// 1. When the connection is closed by some other known issue.
+			// 2. User closed the connection.
+			// 3. A graceful close of connection.
+			infof("transport: loopyWriter.run returning. %v", err)
+			err = nil
+		}
+	}()
+	for {
+		it, err := l.cbuf.get(true)
+		if err != nil {
+			return err
+		}
+		if err = l.handle(it); err != nil {
+			return err
+		}
+		if _, err = l.processData(); err != nil {
+			return err
+		}
+		gosched := true
+	hasdata:
+		for {
+			it, err := l.cbuf.get(false)
+			if err != nil {
+				return err
+			}
+			if it != nil {
+				if err = l.handle(it); err != nil {
+					return err
+				}
+				if _, err = l.processData(); err != nil {
+					return err
+				}
+				continue hasdata
+			}
+			isEmpty, err := l.processData()
+			if err != nil {
+				return err
+			}
+			if !isEmpty {
+				continue hasdata
+			}
+			if gosched {
+				gosched = false
+				if l.framer.writer.offset < minBatchSize {
+					runtime.Gosched()
+					continue hasdata
+				}
+			}
+			l.framer.writer.Flush()
+			break hasdata
+
+		}
+	}
+}
+
+func (l *loopyWriter) outgoingWindowUpdateHandler(w *outgoingWindowUpdate) error {
+	return l.framer.fr.WriteWindowUpdate(w.streamID, w.increment)
+}
+
+func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) error {
+	// Otherwise update the quota.
+	if w.streamID == 0 {
+		l.sendQuota += w.increment
+		return nil
+	}
+	// Find the stream and update it.
+	if str, ok := l.estdStreams[w.streamID]; ok {
+		str.bytesOutStanding -= int(w.increment)
+		if strQuota := int(l.oiws) - str.bytesOutStanding; strQuota > 0 && str.state == waitingOnStreamQuota {
+			str.state = active
+			l.activeStreams.enqueue(str)
+			return nil
+		}
+	}
+	return nil
+}
+
+func (l *loopyWriter) outgoingSettingsHandler(s *outgoingSettings) error {
+	return l.framer.fr.WriteSettings(s.ss...)
+}
+
+func (l *loopyWriter) incomingSettingsHandler(s *incomingSettings) error {
+	if err := l.applySettings(s.ss); err != nil {
+		return err
+	}
+	return l.framer.fr.WriteSettingsAck()
+}
+
+func (l *loopyWriter) registerStreamHandler(h *registerStream) error {
+	str := &outStream{
+		id:    h.streamID,
+		state: empty,
+		itl:   &itemList{},
+		wq:    h.wq,
+	}
+	l.estdStreams[h.streamID] = str
+	return nil
+}
+
+func (l *loopyWriter) headerHandler(h *headerFrame) error {
+	if l.side == serverSide {
+		str, ok := l.estdStreams[h.streamID]
+		if !ok {
+			warningf("transport: loopy doesn't recognize the stream: %d", h.streamID)
+			return nil
+		}
+		// Case 1.A: Server is responding back with headers.
+		if !h.endStream {
+			return l.writeHeader(h.streamID, h.endStream, h.hf, h.onWrite)
+		}
+		// else:  Case 1.B: Server wants to close stream.
+
+		if str.state != empty { // either active or waiting on stream quota.
+			// add it str's list of items.
+			str.itl.enqueue(h)
+			return nil
+		}
+		if err := l.writeHeader(h.streamID, h.endStream, h.hf, h.onWrite); err != nil {
+			return err
+		}
+		return l.cleanupStreamHandler(h.cleanup)
+	}
+	// Case 2: Client wants to originate stream.
+	str := &outStream{
+		id:    h.streamID,
+		state: empty,
+		itl:   &itemList{},
+		wq:    h.wq,
+	}
+	str.itl.enqueue(h)
+	return l.originateStream(str)
+}
+
+func (l *loopyWriter) originateStream(str *outStream) error {
+	hdr := str.itl.dequeue().(*headerFrame)
+	if err := hdr.initStream(str.id); err != nil {
+		if err == ErrConnClosing {
+			return err
+		}
+		// Other errors(errStreamDrain) need not close transport.
+		return nil
+	}
+	if err := l.writeHeader(str.id, hdr.endStream, hdr.hf, hdr.onWrite); err != nil {
+		return err
+	}
+	l.estdStreams[str.id] = str
+	return nil
+}
+
+func (l *loopyWriter) writeHeader(streamID uint32, endStream bool, hf []hpack.HeaderField, onWrite func()) error {
+	if onWrite != nil {
+		onWrite()
+	}
+	l.hBuf.Reset()
+	for _, f := range hf {
+		if err := l.hEnc.WriteField(f); err != nil {
+			warningf("transport: loopyWriter.writeHeader encountered error while encoding headers:", err)
+		}
+	}
+	var (
+		err               error
+		endHeaders, first bool
+	)
+	first = true
+	for !endHeaders {
+		size := l.hBuf.Len()
+		if size > http2MaxFrameLen {
+			size = http2MaxFrameLen
+		} else {
+			endHeaders = true
+		}
+		if first {
+			first = false
+			err = l.framer.fr.WriteHeaders(http2.HeadersFrameParam{
+				StreamID:      streamID,
+				BlockFragment: l.hBuf.Next(size),
+				EndStream:     endStream,
+				EndHeaders:    endHeaders,
+			})
+		} else {
+			err = l.framer.fr.WriteContinuation(
+				streamID,
+				endHeaders,
+				l.hBuf.Next(size),
+			)
+		}
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (l *loopyWriter) preprocessData(df *dataFrame) error {
+	str, ok := l.estdStreams[df.streamID]
+	if !ok {
+		return nil
+	}
+	// If we got data for a stream it means that
+	// stream was originated and the headers were sent out.
+	str.itl.enqueue(df)
+	if str.state == empty {
+		str.state = active
+		l.activeStreams.enqueue(str)
+	}
+	return nil
+}
+
+func (l *loopyWriter) pingHandler(p *ping) error {
+	if !p.ack {
+		l.bdpEst.timesnap(p.data)
+	}
+	return l.framer.fr.WritePing(p.ack, p.data)
+
+}
+
+func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) error {
+	o.resp <- l.sendQuota
+	return nil
+}
+
+func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
+	c.onWrite()
+	if str, ok := l.estdStreams[c.streamID]; ok {
+		// On the server side it could be a trailers-only response or
+		// a RST_STREAM before stream initialization thus the stream might
+		// not be established yet.
+		delete(l.estdStreams, c.streamID)
+		str.deleteSelf()
+	}
+	if c.rst { // If RST_STREAM needs to be sent.
+		if err := l.framer.fr.WriteRSTStream(c.streamID, c.rstCode); err != nil {
+			return err
+		}
+	}
+	if l.side == clientSide && l.draining && len(l.estdStreams) == 0 {
+		return ErrConnClosing
+	}
+	return nil
+}
+
+func (l *loopyWriter) incomingGoAwayHandler(*incomingGoAway) error {
+	if l.side == clientSide {
+		l.draining = true
+		if len(l.estdStreams) == 0 {
+			return ErrConnClosing
+		}
+	}
+	return nil
+}
+
+func (l *loopyWriter) goAwayHandler(g *goAway) error {
+	// Handling of outgoing GoAway is very specific to side.
+	if l.ssGoAwayHandler != nil {
+		draining, err := l.ssGoAwayHandler(g)
+		if err != nil {
+			return err
+		}
+		l.draining = draining
+	}
+	return nil
+}
+
+func (l *loopyWriter) handle(i interface{}) error {
+	switch i := i.(type) {
+	case *incomingWindowUpdate:
+		return l.incomingWindowUpdateHandler(i)
+	case *outgoingWindowUpdate:
+		return l.outgoingWindowUpdateHandler(i)
+	case *incomingSettings:
+		return l.incomingSettingsHandler(i)
+	case *outgoingSettings:
+		return l.outgoingSettingsHandler(i)
+	case *headerFrame:
+		return l.headerHandler(i)
+	case *registerStream:
+		return l.registerStreamHandler(i)
+	case *cleanupStream:
+		return l.cleanupStreamHandler(i)
+	case *incomingGoAway:
+		return l.incomingGoAwayHandler(i)
+	case *dataFrame:
+		return l.preprocessData(i)
+	case *ping:
+		return l.pingHandler(i)
+	case *goAway:
+		return l.goAwayHandler(i)
+	case *outFlowControlSizeRequest:
+		return l.outFlowControlSizeRequestHandler(i)
+	default:
+		return fmt.Errorf("transport: unknown control message type %T", i)
+	}
+}
+
+func (l *loopyWriter) applySettings(ss []http2.Setting) error {
+	for _, s := range ss {
+		switch s.ID {
+		case http2.SettingInitialWindowSize:
+			o := l.oiws
+			l.oiws = s.Val
+			if o < l.oiws {
+				// If the new limit is greater make all depleted streams active.
+				for _, stream := range l.estdStreams {
+					if stream.state == waitingOnStreamQuota {
+						stream.state = active
+						l.activeStreams.enqueue(stream)
+					}
+				}
+			}
+		case http2.SettingHeaderTableSize:
+			updateHeaderTblSize(l.hEnc, s.Val)
+		}
+	}
+	return nil
+}
+
+// processData removes the first stream from active streams, writes out at most 16KB
+// of its data and then puts it at the end of activeStreams if there's still more data
+// to be sent and stream has some stream-level flow control.
+func (l *loopyWriter) processData() (bool, error) {
+	if l.sendQuota == 0 {
+		return true, nil
+	}
+	str := l.activeStreams.dequeue() // Remove the first stream.
+	if str == nil {
+		return true, nil
+	}
+	dataItem := str.itl.peek().(*dataFrame) // Peek at the first data item this stream.
+	// A data item is represented by a dataFrame, since it later translates into
+	// multiple HTTP2 data frames.
+	// Every dataFrame has two buffers; h that keeps grpc-message header and d that is acutal data.
+	// As an optimization to keep wire traffic low, data from d is copied to h to make as big as the
+	// maximum possilbe HTTP2 frame size.
+
+	if len(dataItem.h) == 0 && len(dataItem.d) == 0 { // Empty data frame
+		// Client sends out empty data frame with endStream = true
+		if err := l.framer.fr.WriteData(dataItem.streamID, dataItem.endStream, nil); err != nil {
+			return false, err
+		}
+		str.itl.dequeue() // remove the empty data item from stream
+		if str.itl.isEmpty() {
+			str.state = empty
+		} else if trailer, ok := str.itl.peek().(*headerFrame); ok { // the next item is trailers.
+			if err := l.writeHeader(trailer.streamID, trailer.endStream, trailer.hf, trailer.onWrite); err != nil {
+				return false, err
+			}
+			if err := l.cleanupStreamHandler(trailer.cleanup); err != nil {
+				return false, nil
+			}
+		} else {
+			l.activeStreams.enqueue(str)
+		}
+		return false, nil
+	}
+	var (
+		idx int
+		buf []byte
+	)
+	if len(dataItem.h) != 0 { // data header has not been written out yet.
+		buf = dataItem.h
+	} else {
+		idx = 1
+		buf = dataItem.d
+	}
+	size := http2MaxFrameLen
+	if len(buf) < size {
+		size = len(buf)
+	}
+	if strQuota := int(l.oiws) - str.bytesOutStanding; strQuota <= 0 { // stream-level flow control.
+		str.state = waitingOnStreamQuota
+		return false, nil
+	} else if strQuota < size {
+		size = strQuota
+	}
+
+	if l.sendQuota < uint32(size) { // connection-level flow control.
+		size = int(l.sendQuota)
+	}
+	// Now that outgoing flow controls are checked we can replenish str's write quota
+	str.wq.replenish(size)
+	var endStream bool
+	// If this is the last data message on this stream and all of it can be written in this iteration.
+	if dataItem.endStream && size == len(buf) {
+		// buf contains either data or it contains header but data is empty.
+		if idx == 1 || len(dataItem.d) == 0 {
+			endStream = true
+		}
+	}
+	if dataItem.onEachWrite != nil {
+		dataItem.onEachWrite()
+	}
+	if err := l.framer.fr.WriteData(dataItem.streamID, endStream, buf[:size]); err != nil {
+		return false, err
+	}
+	buf = buf[size:]
+	str.bytesOutStanding += size
+	l.sendQuota -= uint32(size)
+	if idx == 0 {
+		dataItem.h = buf
+	} else {
+		dataItem.d = buf
+	}
+
+	if len(dataItem.h) == 0 && len(dataItem.d) == 0 { // All the data from that message was written out.
+		str.itl.dequeue()
+	}
+	if str.itl.isEmpty() {
+		str.state = empty
+	} else if trailer, ok := str.itl.peek().(*headerFrame); ok { // The next item is trailers.
+		if err := l.writeHeader(trailer.streamID, trailer.endStream, trailer.hf, trailer.onWrite); err != nil {
+			return false, err
+		}
+		if err := l.cleanupStreamHandler(trailer.cleanup); err != nil {
+			return false, err
+		}
+	} else if int(l.oiws)-str.bytesOutStanding <= 0 { // Ran out of stream quota.
+		str.state = waitingOnStreamQuota
+	} else { // Otherwise add it back to the list of active streams.
+		l.activeStreams.enqueue(str)
+	}
+	return false, nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/defaults.go b/vendor/google.golang.org/grpc/internal/transport/defaults.go
new file mode 100644
index 0000000..9fa306b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/defaults.go
@@ -0,0 +1,49 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"math"
+	"time"
+)
+
+const (
+	// The default value of flow control window size in HTTP2 spec.
+	defaultWindowSize = 65535
+	// The initial window size for flow control.
+	initialWindowSize             = defaultWindowSize // for an RPC
+	infinity                      = time.Duration(math.MaxInt64)
+	defaultClientKeepaliveTime    = infinity
+	defaultClientKeepaliveTimeout = 20 * time.Second
+	defaultMaxStreamsClient       = 100
+	defaultMaxConnectionIdle      = infinity
+	defaultMaxConnectionAge       = infinity
+	defaultMaxConnectionAgeGrace  = infinity
+	defaultServerKeepaliveTime    = 2 * time.Hour
+	defaultServerKeepaliveTimeout = 20 * time.Second
+	defaultKeepalivePolicyMinTime = 5 * time.Minute
+	// max window limit set by HTTP2 Specs.
+	maxWindowSize = math.MaxInt32
+	// defaultWriteQuota is the default value for number of data
+	// bytes that each stream can schedule before some of it being
+	// flushed out.
+	defaultWriteQuota              = 64 * 1024
+	defaultClientMaxHeaderListSize = uint32(16 << 20)
+	defaultServerMaxHeaderListSize = uint32(16 << 20)
+)
diff --git a/vendor/google.golang.org/grpc/internal/transport/flowcontrol.go b/vendor/google.golang.org/grpc/internal/transport/flowcontrol.go
new file mode 100644
index 0000000..f262edd
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/flowcontrol.go
@@ -0,0 +1,217 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"sync/atomic"
+)
+
+// writeQuota is a soft limit on the amount of data a stream can
+// schedule before some of it is written out.
+type writeQuota struct {
+	quota int32
+	// get waits on read from when quota goes less than or equal to zero.
+	// replenish writes on it when quota goes positive again.
+	ch chan struct{}
+	// done is triggered in error case.
+	done <-chan struct{}
+	// replenish is called by loopyWriter to give quota back to.
+	// It is implemented as a field so that it can be updated
+	// by tests.
+	replenish func(n int)
+}
+
+func newWriteQuota(sz int32, done <-chan struct{}) *writeQuota {
+	w := &writeQuota{
+		quota: sz,
+		ch:    make(chan struct{}, 1),
+		done:  done,
+	}
+	w.replenish = w.realReplenish
+	return w
+}
+
+func (w *writeQuota) get(sz int32) error {
+	for {
+		if atomic.LoadInt32(&w.quota) > 0 {
+			atomic.AddInt32(&w.quota, -sz)
+			return nil
+		}
+		select {
+		case <-w.ch:
+			continue
+		case <-w.done:
+			return errStreamDone
+		}
+	}
+}
+
+func (w *writeQuota) realReplenish(n int) {
+	sz := int32(n)
+	a := atomic.AddInt32(&w.quota, sz)
+	b := a - sz
+	if b <= 0 && a > 0 {
+		select {
+		case w.ch <- struct{}{}:
+		default:
+		}
+	}
+}
+
+type trInFlow struct {
+	limit               uint32
+	unacked             uint32
+	effectiveWindowSize uint32
+}
+
+func (f *trInFlow) newLimit(n uint32) uint32 {
+	d := n - f.limit
+	f.limit = n
+	f.updateEffectiveWindowSize()
+	return d
+}
+
+func (f *trInFlow) onData(n uint32) uint32 {
+	f.unacked += n
+	if f.unacked >= f.limit/4 {
+		w := f.unacked
+		f.unacked = 0
+		f.updateEffectiveWindowSize()
+		return w
+	}
+	f.updateEffectiveWindowSize()
+	return 0
+}
+
+func (f *trInFlow) reset() uint32 {
+	w := f.unacked
+	f.unacked = 0
+	f.updateEffectiveWindowSize()
+	return w
+}
+
+func (f *trInFlow) updateEffectiveWindowSize() {
+	atomic.StoreUint32(&f.effectiveWindowSize, f.limit-f.unacked)
+}
+
+func (f *trInFlow) getSize() uint32 {
+	return atomic.LoadUint32(&f.effectiveWindowSize)
+}
+
+// TODO(mmukhi): Simplify this code.
+// inFlow deals with inbound flow control
+type inFlow struct {
+	mu sync.Mutex
+	// The inbound flow control limit for pending data.
+	limit uint32
+	// pendingData is the overall data which have been received but not been
+	// consumed by applications.
+	pendingData uint32
+	// The amount of data the application has consumed but grpc has not sent
+	// window update for them. Used to reduce window update frequency.
+	pendingUpdate uint32
+	// delta is the extra window update given by receiver when an application
+	// is reading data bigger in size than the inFlow limit.
+	delta uint32
+}
+
+// newLimit updates the inflow window to a new value n.
+// It assumes that n is always greater than the old limit.
+func (f *inFlow) newLimit(n uint32) uint32 {
+	f.mu.Lock()
+	d := n - f.limit
+	f.limit = n
+	f.mu.Unlock()
+	return d
+}
+
+func (f *inFlow) maybeAdjust(n uint32) uint32 {
+	if n > uint32(math.MaxInt32) {
+		n = uint32(math.MaxInt32)
+	}
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	// estSenderQuota is the receiver's view of the maximum number of bytes the sender
+	// can send without a window update.
+	estSenderQuota := int32(f.limit - (f.pendingData + f.pendingUpdate))
+	// estUntransmittedData is the maximum number of bytes the sends might not have put
+	// on the wire yet. A value of 0 or less means that we have already received all or
+	// more bytes than the application is requesting to read.
+	estUntransmittedData := int32(n - f.pendingData) // Casting into int32 since it could be negative.
+	// This implies that unless we send a window update, the sender won't be able to send all the bytes
+	// for this message. Therefore we must send an update over the limit since there's an active read
+	// request from the application.
+	if estUntransmittedData > estSenderQuota {
+		// Sender's window shouldn't go more than 2^31 - 1 as specified in the HTTP spec.
+		if f.limit+n > maxWindowSize {
+			f.delta = maxWindowSize - f.limit
+		} else {
+			// Send a window update for the whole message and not just the difference between
+			// estUntransmittedData and estSenderQuota. This will be helpful in case the message
+			// is padded; We will fallback on the current available window(at least a 1/4th of the limit).
+			f.delta = n
+		}
+		return f.delta
+	}
+	return 0
+}
+
+// onData is invoked when some data frame is received. It updates pendingData.
+func (f *inFlow) onData(n uint32) error {
+	f.mu.Lock()
+	f.pendingData += n
+	if f.pendingData+f.pendingUpdate > f.limit+f.delta {
+		limit := f.limit
+		rcvd := f.pendingData + f.pendingUpdate
+		f.mu.Unlock()
+		return fmt.Errorf("received %d-bytes data exceeding the limit %d bytes", rcvd, limit)
+	}
+	f.mu.Unlock()
+	return nil
+}
+
+// onRead is invoked when the application reads the data. It returns the window size
+// to be sent to the peer.
+func (f *inFlow) onRead(n uint32) uint32 {
+	f.mu.Lock()
+	if f.pendingData == 0 {
+		f.mu.Unlock()
+		return 0
+	}
+	f.pendingData -= n
+	if n > f.delta {
+		n -= f.delta
+		f.delta = 0
+	} else {
+		f.delta -= n
+		n = 0
+	}
+	f.pendingUpdate += n
+	if f.pendingUpdate >= f.limit/4 {
+		wu := f.pendingUpdate
+		f.pendingUpdate = 0
+		f.mu.Unlock()
+		return wu
+	}
+	f.mu.Unlock()
+	return 0
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/handler_server.go b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
new file mode 100644
index 0000000..fbf01d5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
@@ -0,0 +1,435 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// This file is the implementation of a gRPC server using HTTP/2 which
+// uses the standard Go http2 Server implementation (via the
+// http.Handler interface), rather than speaking low-level HTTP/2
+// frames itself. It is the implementation of *grpc.Server.ServeHTTP.
+
+package transport
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"golang.org/x/net/http2"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+)
+
+// NewServerHandlerTransport returns a ServerTransport handling gRPC
+// from inside an http.Handler. It requires that the http Server
+// supports HTTP/2.
+func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats stats.Handler) (ServerTransport, error) {
+	if r.ProtoMajor != 2 {
+		return nil, errors.New("gRPC requires HTTP/2")
+	}
+	if r.Method != "POST" {
+		return nil, errors.New("invalid gRPC request method")
+	}
+	contentType := r.Header.Get("Content-Type")
+	// TODO: do we assume contentType is lowercase? we did before
+	contentSubtype, validContentType := contentSubtype(contentType)
+	if !validContentType {
+		return nil, errors.New("invalid gRPC request content-type")
+	}
+	if _, ok := w.(http.Flusher); !ok {
+		return nil, errors.New("gRPC requires a ResponseWriter supporting http.Flusher")
+	}
+
+	st := &serverHandlerTransport{
+		rw:             w,
+		req:            r,
+		closedCh:       make(chan struct{}),
+		writes:         make(chan func()),
+		contentType:    contentType,
+		contentSubtype: contentSubtype,
+		stats:          stats,
+	}
+
+	if v := r.Header.Get("grpc-timeout"); v != "" {
+		to, err := decodeTimeout(v)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "malformed time-out: %v", err)
+		}
+		st.timeoutSet = true
+		st.timeout = to
+	}
+
+	metakv := []string{"content-type", contentType}
+	if r.Host != "" {
+		metakv = append(metakv, ":authority", r.Host)
+	}
+	for k, vv := range r.Header {
+		k = strings.ToLower(k)
+		if isReservedHeader(k) && !isWhitelistedHeader(k) {
+			continue
+		}
+		for _, v := range vv {
+			v, err := decodeMetadataHeader(k, v)
+			if err != nil {
+				return nil, status.Errorf(codes.Internal, "malformed binary metadata: %v", err)
+			}
+			metakv = append(metakv, k, v)
+		}
+	}
+	st.headerMD = metadata.Pairs(metakv...)
+
+	return st, nil
+}
+
+// serverHandlerTransport is an implementation of ServerTransport
+// which replies to exactly one gRPC request (exactly one HTTP request),
+// using the net/http.Handler interface. This http.Handler is guaranteed
+// at this point to be speaking over HTTP/2, so it's able to speak valid
+// gRPC.
+type serverHandlerTransport struct {
+	rw               http.ResponseWriter
+	req              *http.Request
+	timeoutSet       bool
+	timeout          time.Duration
+	didCommonHeaders bool
+
+	headerMD metadata.MD
+
+	closeOnce sync.Once
+	closedCh  chan struct{} // closed on Close
+
+	// writes is a channel of code to run serialized in the
+	// ServeHTTP (HandleStreams) goroutine. The channel is closed
+	// when WriteStatus is called.
+	writes chan func()
+
+	// block concurrent WriteStatus calls
+	// e.g. grpc/(*serverStream).SendMsg/RecvMsg
+	writeStatusMu sync.Mutex
+
+	// we just mirror the request content-type
+	contentType string
+	// we store both contentType and contentSubtype so we don't keep recreating them
+	// TODO make sure this is consistent across handler_server and http2_server
+	contentSubtype string
+
+	stats stats.Handler
+}
+
+func (ht *serverHandlerTransport) Close() error {
+	ht.closeOnce.Do(ht.closeCloseChanOnce)
+	return nil
+}
+
+func (ht *serverHandlerTransport) closeCloseChanOnce() { close(ht.closedCh) }
+
+func (ht *serverHandlerTransport) RemoteAddr() net.Addr { return strAddr(ht.req.RemoteAddr) }
+
+// strAddr is a net.Addr backed by either a TCP "ip:port" string, or
+// the empty string if unknown.
+type strAddr string
+
+func (a strAddr) Network() string {
+	if a != "" {
+		// Per the documentation on net/http.Request.RemoteAddr, if this is
+		// set, it's set to the IP:port of the peer (hence, TCP):
+		// https://golang.org/pkg/net/http/#Request
+		//
+		// If we want to support Unix sockets later, we can
+		// add our own grpc-specific convention within the
+		// grpc codebase to set RemoteAddr to a different
+		// format, or probably better: we can attach it to the
+		// context and use that from serverHandlerTransport.RemoteAddr.
+		return "tcp"
+	}
+	return ""
+}
+
+func (a strAddr) String() string { return string(a) }
+
+// do runs fn in the ServeHTTP goroutine.
+func (ht *serverHandlerTransport) do(fn func()) error {
+	select {
+	case <-ht.closedCh:
+		return ErrConnClosing
+	case ht.writes <- fn:
+		return nil
+	}
+}
+
+func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) error {
+	ht.writeStatusMu.Lock()
+	defer ht.writeStatusMu.Unlock()
+
+	err := ht.do(func() {
+		ht.writeCommonHeaders(s)
+
+		// And flush, in case no header or body has been sent yet.
+		// This forces a separation of headers and trailers if this is the
+		// first call (for example, in end2end tests's TestNoService).
+		ht.rw.(http.Flusher).Flush()
+
+		h := ht.rw.Header()
+		h.Set("Grpc-Status", fmt.Sprintf("%d", st.Code()))
+		if m := st.Message(); m != "" {
+			h.Set("Grpc-Message", encodeGrpcMessage(m))
+		}
+
+		if p := st.Proto(); p != nil && len(p.Details) > 0 {
+			stBytes, err := proto.Marshal(p)
+			if err != nil {
+				// TODO: return error instead, when callers are able to handle it.
+				panic(err)
+			}
+
+			h.Set("Grpc-Status-Details-Bin", encodeBinHeader(stBytes))
+		}
+
+		if md := s.Trailer(); len(md) > 0 {
+			for k, vv := range md {
+				// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
+				if isReservedHeader(k) {
+					continue
+				}
+				for _, v := range vv {
+					// http2 ResponseWriter mechanism to send undeclared Trailers after
+					// the headers have possibly been written.
+					h.Add(http2.TrailerPrefix+k, encodeMetadataHeader(k, v))
+				}
+			}
+		}
+	})
+
+	if err == nil { // transport has not been closed
+		if ht.stats != nil {
+			ht.stats.HandleRPC(s.Context(), &stats.OutTrailer{
+				Trailer: s.trailer.Copy(),
+			})
+		}
+	}
+	ht.Close()
+	return err
+}
+
+// writeCommonHeaders sets common headers on the first write
+// call (Write, WriteHeader, or WriteStatus).
+func (ht *serverHandlerTransport) writeCommonHeaders(s *Stream) {
+	if ht.didCommonHeaders {
+		return
+	}
+	ht.didCommonHeaders = true
+
+	h := ht.rw.Header()
+	h["Date"] = nil // suppress Date to make tests happy; TODO: restore
+	h.Set("Content-Type", ht.contentType)
+
+	// Predeclare trailers we'll set later in WriteStatus (after the body).
+	// This is a SHOULD in the HTTP RFC, and the way you add (known)
+	// Trailers per the net/http.ResponseWriter contract.
+	// See https://golang.org/pkg/net/http/#ResponseWriter
+	// and https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
+	h.Add("Trailer", "Grpc-Status")
+	h.Add("Trailer", "Grpc-Message")
+	h.Add("Trailer", "Grpc-Status-Details-Bin")
+
+	if s.sendCompress != "" {
+		h.Set("Grpc-Encoding", s.sendCompress)
+	}
+}
+
+func (ht *serverHandlerTransport) Write(s *Stream, hdr []byte, data []byte, opts *Options) error {
+	return ht.do(func() {
+		ht.writeCommonHeaders(s)
+		ht.rw.Write(hdr)
+		ht.rw.Write(data)
+		ht.rw.(http.Flusher).Flush()
+	})
+}
+
+func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
+	err := ht.do(func() {
+		ht.writeCommonHeaders(s)
+		h := ht.rw.Header()
+		for k, vv := range md {
+			// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
+			if isReservedHeader(k) {
+				continue
+			}
+			for _, v := range vv {
+				v = encodeMetadataHeader(k, v)
+				h.Add(k, v)
+			}
+		}
+		ht.rw.WriteHeader(200)
+		ht.rw.(http.Flusher).Flush()
+	})
+
+	if err == nil {
+		if ht.stats != nil {
+			ht.stats.HandleRPC(s.Context(), &stats.OutHeader{
+				Header: md.Copy(),
+			})
+		}
+	}
+	return err
+}
+
+func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream), traceCtx func(context.Context, string) context.Context) {
+	// With this transport type there will be exactly 1 stream: this HTTP request.
+
+	ctx := ht.req.Context()
+	var cancel context.CancelFunc
+	if ht.timeoutSet {
+		ctx, cancel = context.WithTimeout(ctx, ht.timeout)
+	} else {
+		ctx, cancel = context.WithCancel(ctx)
+	}
+
+	// requestOver is closed when the status has been written via WriteStatus.
+	requestOver := make(chan struct{})
+	go func() {
+		select {
+		case <-requestOver:
+		case <-ht.closedCh:
+		case <-ht.req.Context().Done():
+		}
+		cancel()
+		ht.Close()
+	}()
+
+	req := ht.req
+
+	s := &Stream{
+		id:             0, // irrelevant
+		requestRead:    func(int) {},
+		cancel:         cancel,
+		buf:            newRecvBuffer(),
+		st:             ht,
+		method:         req.URL.Path,
+		recvCompress:   req.Header.Get("grpc-encoding"),
+		contentSubtype: ht.contentSubtype,
+	}
+	pr := &peer.Peer{
+		Addr: ht.RemoteAddr(),
+	}
+	if req.TLS != nil {
+		pr.AuthInfo = credentials.TLSInfo{State: *req.TLS}
+	}
+	ctx = metadata.NewIncomingContext(ctx, ht.headerMD)
+	s.ctx = peer.NewContext(ctx, pr)
+	if ht.stats != nil {
+		s.ctx = ht.stats.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
+		inHeader := &stats.InHeader{
+			FullMethod:  s.method,
+			RemoteAddr:  ht.RemoteAddr(),
+			Compression: s.recvCompress,
+		}
+		ht.stats.HandleRPC(s.ctx, inHeader)
+	}
+	s.trReader = &transportReader{
+		reader:        &recvBufferReader{ctx: s.ctx, ctxDone: s.ctx.Done(), recv: s.buf, freeBuffer: func(*bytes.Buffer) {}},
+		windowHandler: func(int) {},
+	}
+
+	// readerDone is closed when the Body.Read-ing goroutine exits.
+	readerDone := make(chan struct{})
+	go func() {
+		defer close(readerDone)
+
+		// TODO: minimize garbage, optimize recvBuffer code/ownership
+		const readSize = 8196
+		for buf := make([]byte, readSize); ; {
+			n, err := req.Body.Read(buf)
+			if n > 0 {
+				s.buf.put(recvMsg{buffer: bytes.NewBuffer(buf[:n:n])})
+				buf = buf[n:]
+			}
+			if err != nil {
+				s.buf.put(recvMsg{err: mapRecvMsgError(err)})
+				return
+			}
+			if len(buf) == 0 {
+				buf = make([]byte, readSize)
+			}
+		}
+	}()
+
+	// startStream is provided by the *grpc.Server's serveStreams.
+	// It starts a goroutine serving s and exits immediately.
+	// The goroutine that is started is the one that then calls
+	// into ht, calling WriteHeader, Write, WriteStatus, Close, etc.
+	startStream(s)
+
+	ht.runStream()
+	close(requestOver)
+
+	// Wait for reading goroutine to finish.
+	req.Body.Close()
+	<-readerDone
+}
+
+func (ht *serverHandlerTransport) runStream() {
+	for {
+		select {
+		case fn := <-ht.writes:
+			fn()
+		case <-ht.closedCh:
+			return
+		}
+	}
+}
+
+func (ht *serverHandlerTransport) IncrMsgSent() {}
+
+func (ht *serverHandlerTransport) IncrMsgRecv() {}
+
+func (ht *serverHandlerTransport) Drain() {
+	panic("Drain() is not implemented")
+}
+
+// mapRecvMsgError returns the non-nil err into the appropriate
+// error value as expected by callers of *grpc.parser.recvMsg.
+// In particular, in can only be:
+//   * io.EOF
+//   * io.ErrUnexpectedEOF
+//   * of type transport.ConnectionError
+//   * an error from the status package
+func mapRecvMsgError(err error) error {
+	if err == io.EOF || err == io.ErrUnexpectedEOF {
+		return err
+	}
+	if se, ok := err.(http2.StreamError); ok {
+		if code, ok := http2ErrConvTab[se.Code]; ok {
+			return status.Error(code, se.Error())
+		}
+	}
+	if strings.Contains(err.Error(), "body closed by handler") {
+		return status.Error(codes.Canceled, err.Error())
+	}
+	return connectionErrorf(true, err, err.Error())
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_client.go b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
new file mode 100644
index 0000000..e189356
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -0,0 +1,1453 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/syscall"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+)
+
+// clientConnectionCounter counts the number of connections a client has
+// initiated (equal to the number of http2Clients created). Must be accessed
+// atomically.
+var clientConnectionCounter uint64
+
+// http2Client implements the ClientTransport interface with HTTP2.
+type http2Client struct {
+	lastRead   int64 // Keep this field 64-bit aligned. Accessed atomically.
+	ctx        context.Context
+	cancel     context.CancelFunc
+	ctxDone    <-chan struct{} // Cache the ctx.Done() chan.
+	userAgent  string
+	md         interface{}
+	conn       net.Conn // underlying communication channel
+	loopy      *loopyWriter
+	remoteAddr net.Addr
+	localAddr  net.Addr
+	authInfo   credentials.AuthInfo // auth info about the connection
+
+	readerDone chan struct{} // sync point to enable testing.
+	writerDone chan struct{} // sync point to enable testing.
+	// goAway is closed to notify the upper layer (i.e., addrConn.transportMonitor)
+	// that the server sent GoAway on this transport.
+	goAway chan struct{}
+
+	framer *framer
+	// controlBuf delivers all the control related tasks (e.g., window
+	// updates, reset streams, and various settings) to the controller.
+	controlBuf *controlBuffer
+	fc         *trInFlow
+	// The scheme used: https if TLS is on, http otherwise.
+	scheme string
+
+	isSecure bool
+
+	perRPCCreds []credentials.PerRPCCredentials
+
+	kp               keepalive.ClientParameters
+	keepaliveEnabled bool
+
+	statsHandler stats.Handler
+
+	initialWindowSize int32
+
+	// configured by peer through SETTINGS_MAX_HEADER_LIST_SIZE
+	maxSendHeaderListSize *uint32
+
+	bdpEst *bdpEstimator
+	// onPrefaceReceipt is a callback that client transport calls upon
+	// receiving server preface to signal that a succefull HTTP2
+	// connection was established.
+	onPrefaceReceipt func()
+
+	maxConcurrentStreams  uint32
+	streamQuota           int64
+	streamsQuotaAvailable chan struct{}
+	waitingStreams        uint32
+	nextID                uint32
+
+	mu            sync.Mutex // guard the following variables
+	state         transportState
+	activeStreams map[uint32]*Stream
+	// prevGoAway ID records the Last-Stream-ID in the previous GOAway frame.
+	prevGoAwayID uint32
+	// goAwayReason records the http2.ErrCode and debug data received with the
+	// GoAway frame.
+	goAwayReason GoAwayReason
+	// A condition variable used to signal when the keepalive goroutine should
+	// go dormant. The condition for dormancy is based on the number of active
+	// streams and the `PermitWithoutStream` keepalive client parameter. And
+	// since the number of active streams is guarded by the above mutex, we use
+	// the same for this condition variable as well.
+	kpDormancyCond *sync.Cond
+	// A boolean to track whether the keepalive goroutine is dormant or not.
+	// This is checked before attempting to signal the above condition
+	// variable.
+	kpDormant bool
+
+	// Fields below are for channelz metric collection.
+	channelzID int64 // channelz unique identification number
+	czData     *channelzData
+
+	onGoAway func(GoAwayReason)
+	onClose  func()
+
+	bufferPool *bufferPool
+
+	connectionID uint64
+}
+
+func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr string) (net.Conn, error) {
+	if fn != nil {
+		return fn(ctx, addr)
+	}
+	return (&net.Dialer{}).DialContext(ctx, "tcp", addr)
+}
+
+func isTemporary(err error) bool {
+	switch err := err.(type) {
+	case interface {
+		Temporary() bool
+	}:
+		return err.Temporary()
+	case interface {
+		Timeout() bool
+	}:
+		// Timeouts may be resolved upon retry, and are thus treated as
+		// temporary.
+		return err.Timeout()
+	}
+	return true
+}
+
+// newHTTP2Client constructs a connected ClientTransport to addr based on HTTP2
+// and starts to receive messages on it. Non-nil error returns if construction
+// fails.
+func newHTTP2Client(connectCtx, ctx context.Context, addr TargetInfo, opts ConnectOptions, onPrefaceReceipt func(), onGoAway func(GoAwayReason), onClose func()) (_ *http2Client, err error) {
+	scheme := "http"
+	ctx, cancel := context.WithCancel(ctx)
+	defer func() {
+		if err != nil {
+			cancel()
+		}
+	}()
+
+	conn, err := dial(connectCtx, opts.Dialer, addr.Addr)
+	if err != nil {
+		if opts.FailOnNonTempDialError {
+			return nil, connectionErrorf(isTemporary(err), err, "transport: error while dialing: %v", err)
+		}
+		return nil, connectionErrorf(true, err, "transport: Error while dialing %v", err)
+	}
+	// Any further errors will close the underlying connection
+	defer func(conn net.Conn) {
+		if err != nil {
+			conn.Close()
+		}
+	}(conn)
+	kp := opts.KeepaliveParams
+	// Validate keepalive parameters.
+	if kp.Time == 0 {
+		kp.Time = defaultClientKeepaliveTime
+	}
+	if kp.Timeout == 0 {
+		kp.Timeout = defaultClientKeepaliveTimeout
+	}
+	keepaliveEnabled := false
+	if kp.Time != infinity {
+		if err = syscall.SetTCPUserTimeout(conn, kp.Timeout); err != nil {
+			return nil, connectionErrorf(false, err, "transport: failed to set TCP_USER_TIMEOUT: %v", err)
+		}
+		keepaliveEnabled = true
+	}
+	var (
+		isSecure bool
+		authInfo credentials.AuthInfo
+	)
+	transportCreds := opts.TransportCredentials
+	perRPCCreds := opts.PerRPCCredentials
+
+	if b := opts.CredsBundle; b != nil {
+		if t := b.TransportCredentials(); t != nil {
+			transportCreds = t
+		}
+		if t := b.PerRPCCredentials(); t != nil {
+			perRPCCreds = append(perRPCCreds, t)
+		}
+	}
+	if transportCreds != nil {
+		scheme = "https"
+		conn, authInfo, err = transportCreds.ClientHandshake(connectCtx, addr.Authority, conn)
+		if err != nil {
+			return nil, connectionErrorf(isTemporary(err), err, "transport: authentication handshake failed: %v", err)
+		}
+		isSecure = true
+	}
+	dynamicWindow := true
+	icwz := int32(initialWindowSize)
+	if opts.InitialConnWindowSize >= defaultWindowSize {
+		icwz = opts.InitialConnWindowSize
+		dynamicWindow = false
+	}
+	writeBufSize := opts.WriteBufferSize
+	readBufSize := opts.ReadBufferSize
+	maxHeaderListSize := defaultClientMaxHeaderListSize
+	if opts.MaxHeaderListSize != nil {
+		maxHeaderListSize = *opts.MaxHeaderListSize
+	}
+	t := &http2Client{
+		ctx:                   ctx,
+		ctxDone:               ctx.Done(), // Cache Done chan.
+		cancel:                cancel,
+		userAgent:             opts.UserAgent,
+		md:                    addr.Metadata,
+		conn:                  conn,
+		remoteAddr:            conn.RemoteAddr(),
+		localAddr:             conn.LocalAddr(),
+		authInfo:              authInfo,
+		readerDone:            make(chan struct{}),
+		writerDone:            make(chan struct{}),
+		goAway:                make(chan struct{}),
+		framer:                newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize),
+		fc:                    &trInFlow{limit: uint32(icwz)},
+		scheme:                scheme,
+		activeStreams:         make(map[uint32]*Stream),
+		isSecure:              isSecure,
+		perRPCCreds:           perRPCCreds,
+		kp:                    kp,
+		statsHandler:          opts.StatsHandler,
+		initialWindowSize:     initialWindowSize,
+		onPrefaceReceipt:      onPrefaceReceipt,
+		nextID:                1,
+		maxConcurrentStreams:  defaultMaxStreamsClient,
+		streamQuota:           defaultMaxStreamsClient,
+		streamsQuotaAvailable: make(chan struct{}, 1),
+		czData:                new(channelzData),
+		onGoAway:              onGoAway,
+		onClose:               onClose,
+		keepaliveEnabled:      keepaliveEnabled,
+		bufferPool:            newBufferPool(),
+	}
+	t.controlBuf = newControlBuffer(t.ctxDone)
+	if opts.InitialWindowSize >= defaultWindowSize {
+		t.initialWindowSize = opts.InitialWindowSize
+		dynamicWindow = false
+	}
+	if dynamicWindow {
+		t.bdpEst = &bdpEstimator{
+			bdp:               initialWindowSize,
+			updateFlowControl: t.updateFlowControl,
+		}
+	}
+	if t.statsHandler != nil {
+		t.ctx = t.statsHandler.TagConn(t.ctx, &stats.ConnTagInfo{
+			RemoteAddr: t.remoteAddr,
+			LocalAddr:  t.localAddr,
+		})
+		connBegin := &stats.ConnBegin{
+			Client: true,
+		}
+		t.statsHandler.HandleConn(t.ctx, connBegin)
+	}
+	if channelz.IsOn() {
+		t.channelzID = channelz.RegisterNormalSocket(t, opts.ChannelzParentID, fmt.Sprintf("%s -> %s", t.localAddr, t.remoteAddr))
+	}
+	if t.keepaliveEnabled {
+		t.kpDormancyCond = sync.NewCond(&t.mu)
+		go t.keepalive()
+	}
+	// Start the reader goroutine for incoming message. Each transport has
+	// a dedicated goroutine which reads HTTP2 frame from network. Then it
+	// dispatches the frame to the corresponding stream entity.
+	go t.reader()
+
+	// Send connection preface to server.
+	n, err := t.conn.Write(clientPreface)
+	if err != nil {
+		t.Close()
+		return nil, connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
+	}
+	if n != len(clientPreface) {
+		t.Close()
+		return nil, connectionErrorf(true, err, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
+	}
+	var ss []http2.Setting
+
+	if t.initialWindowSize != defaultWindowSize {
+		ss = append(ss, http2.Setting{
+			ID:  http2.SettingInitialWindowSize,
+			Val: uint32(t.initialWindowSize),
+		})
+	}
+	if opts.MaxHeaderListSize != nil {
+		ss = append(ss, http2.Setting{
+			ID:  http2.SettingMaxHeaderListSize,
+			Val: *opts.MaxHeaderListSize,
+		})
+	}
+	err = t.framer.fr.WriteSettings(ss...)
+	if err != nil {
+		t.Close()
+		return nil, connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
+	}
+	// Adjust the connection flow control window if needed.
+	if delta := uint32(icwz - defaultWindowSize); delta > 0 {
+		if err := t.framer.fr.WriteWindowUpdate(0, delta); err != nil {
+			t.Close()
+			return nil, connectionErrorf(true, err, "transport: failed to write window update: %v", err)
+		}
+	}
+
+	t.connectionID = atomic.AddUint64(&clientConnectionCounter, 1)
+
+	if err := t.framer.writer.Flush(); err != nil {
+		return nil, err
+	}
+	go func() {
+		t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst)
+		err := t.loopy.run()
+		if err != nil {
+			errorf("transport: loopyWriter.run returning. Err: %v", err)
+		}
+		// If it's a connection error, let reader goroutine handle it
+		// since there might be data in the buffers.
+		if _, ok := err.(net.Error); !ok {
+			t.conn.Close()
+		}
+		close(t.writerDone)
+	}()
+	return t, nil
+}
+
+func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
+	// TODO(zhaoq): Handle uint32 overflow of Stream.id.
+	s := &Stream{
+		ct:             t,
+		done:           make(chan struct{}),
+		method:         callHdr.Method,
+		sendCompress:   callHdr.SendCompress,
+		buf:            newRecvBuffer(),
+		headerChan:     make(chan struct{}),
+		contentSubtype: callHdr.ContentSubtype,
+	}
+	s.wq = newWriteQuota(defaultWriteQuota, s.done)
+	s.requestRead = func(n int) {
+		t.adjustWindow(s, uint32(n))
+	}
+	// The client side stream context should have exactly the same life cycle with the user provided context.
+	// That means, s.ctx should be read-only. And s.ctx is done iff ctx is done.
+	// So we use the original context here instead of creating a copy.
+	s.ctx = ctx
+	s.trReader = &transportReader{
+		reader: &recvBufferReader{
+			ctx:     s.ctx,
+			ctxDone: s.ctx.Done(),
+			recv:    s.buf,
+			closeStream: func(err error) {
+				t.CloseStream(s, err)
+			},
+			freeBuffer: t.bufferPool.put,
+		},
+		windowHandler: func(n int) {
+			t.updateWindow(s, uint32(n))
+		},
+	}
+	return s
+}
+
+func (t *http2Client) getPeer() *peer.Peer {
+	return &peer.Peer{
+		Addr:     t.remoteAddr,
+		AuthInfo: t.authInfo,
+	}
+}
+
+func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr) ([]hpack.HeaderField, error) {
+	aud := t.createAudience(callHdr)
+	ri := credentials.RequestInfo{
+		Method: callHdr.Method,
+	}
+	ctxWithRequestInfo := internal.NewRequestInfoContext.(func(context.Context, credentials.RequestInfo) context.Context)(ctx, ri)
+	authData, err := t.getTrAuthData(ctxWithRequestInfo, aud)
+	if err != nil {
+		return nil, err
+	}
+	callAuthData, err := t.getCallAuthData(ctxWithRequestInfo, aud, callHdr)
+	if err != nil {
+		return nil, err
+	}
+	// TODO(mmukhi): Benchmark if the performance gets better if count the metadata and other header fields
+	// first and create a slice of that exact size.
+	// Make the slice of certain predictable size to reduce allocations made by append.
+	hfLen := 7 // :method, :scheme, :path, :authority, content-type, user-agent, te
+	hfLen += len(authData) + len(callAuthData)
+	headerFields := make([]hpack.HeaderField, 0, hfLen)
+	headerFields = append(headerFields, hpack.HeaderField{Name: ":method", Value: "POST"})
+	headerFields = append(headerFields, hpack.HeaderField{Name: ":scheme", Value: t.scheme})
+	headerFields = append(headerFields, hpack.HeaderField{Name: ":path", Value: callHdr.Method})
+	headerFields = append(headerFields, hpack.HeaderField{Name: ":authority", Value: callHdr.Host})
+	headerFields = append(headerFields, hpack.HeaderField{Name: "content-type", Value: contentType(callHdr.ContentSubtype)})
+	headerFields = append(headerFields, hpack.HeaderField{Name: "user-agent", Value: t.userAgent})
+	headerFields = append(headerFields, hpack.HeaderField{Name: "te", Value: "trailers"})
+	if callHdr.PreviousAttempts > 0 {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-previous-rpc-attempts", Value: strconv.Itoa(callHdr.PreviousAttempts)})
+	}
+
+	if callHdr.SendCompress != "" {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-encoding", Value: callHdr.SendCompress})
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-accept-encoding", Value: callHdr.SendCompress})
+	}
+	if dl, ok := ctx.Deadline(); ok {
+		// Send out timeout regardless its value. The server can detect timeout context by itself.
+		// TODO(mmukhi): Perhaps this field should be updated when actually writing out to the wire.
+		timeout := time.Until(dl)
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-timeout", Value: encodeTimeout(timeout)})
+	}
+	for k, v := range authData {
+		headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
+	}
+	for k, v := range callAuthData {
+		headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
+	}
+	if b := stats.OutgoingTags(ctx); b != nil {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-tags-bin", Value: encodeBinHeader(b)})
+	}
+	if b := stats.OutgoingTrace(ctx); b != nil {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-trace-bin", Value: encodeBinHeader(b)})
+	}
+
+	if md, added, ok := metadata.FromOutgoingContextRaw(ctx); ok {
+		var k string
+		for k, vv := range md {
+			// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
+			if isReservedHeader(k) {
+				continue
+			}
+			for _, v := range vv {
+				headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
+			}
+		}
+		for _, vv := range added {
+			for i, v := range vv {
+				if i%2 == 0 {
+					k = v
+					continue
+				}
+				// HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
+				if isReservedHeader(k) {
+					continue
+				}
+				headerFields = append(headerFields, hpack.HeaderField{Name: strings.ToLower(k), Value: encodeMetadataHeader(k, v)})
+			}
+		}
+	}
+	if md, ok := t.md.(*metadata.MD); ok {
+		for k, vv := range *md {
+			if isReservedHeader(k) {
+				continue
+			}
+			for _, v := range vv {
+				headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
+			}
+		}
+	}
+	return headerFields, nil
+}
+
+func (t *http2Client) createAudience(callHdr *CallHdr) string {
+	// Create an audience string only if needed.
+	if len(t.perRPCCreds) == 0 && callHdr.Creds == nil {
+		return ""
+	}
+	// Construct URI required to get auth request metadata.
+	// Omit port if it is the default one.
+	host := strings.TrimSuffix(callHdr.Host, ":443")
+	pos := strings.LastIndex(callHdr.Method, "/")
+	if pos == -1 {
+		pos = len(callHdr.Method)
+	}
+	return "https://" + host + callHdr.Method[:pos]
+}
+
+func (t *http2Client) getTrAuthData(ctx context.Context, audience string) (map[string]string, error) {
+	if len(t.perRPCCreds) == 0 {
+		return nil, nil
+	}
+	authData := map[string]string{}
+	for _, c := range t.perRPCCreds {
+		data, err := c.GetRequestMetadata(ctx, audience)
+		if err != nil {
+			if _, ok := status.FromError(err); ok {
+				return nil, err
+			}
+
+			return nil, status.Errorf(codes.Unauthenticated, "transport: %v", err)
+		}
+		for k, v := range data {
+			// Capital header names are illegal in HTTP/2.
+			k = strings.ToLower(k)
+			authData[k] = v
+		}
+	}
+	return authData, nil
+}
+
+func (t *http2Client) getCallAuthData(ctx context.Context, audience string, callHdr *CallHdr) (map[string]string, error) {
+	var callAuthData map[string]string
+	// Check if credentials.PerRPCCredentials were provided via call options.
+	// Note: if these credentials are provided both via dial options and call
+	// options, then both sets of credentials will be applied.
+	if callCreds := callHdr.Creds; callCreds != nil {
+		if !t.isSecure && callCreds.RequireTransportSecurity() {
+			return nil, status.Error(codes.Unauthenticated, "transport: cannot send secure credentials on an insecure connection")
+		}
+		data, err := callCreds.GetRequestMetadata(ctx, audience)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "transport: %v", err)
+		}
+		callAuthData = make(map[string]string, len(data))
+		for k, v := range data {
+			// Capital header names are illegal in HTTP/2
+			k = strings.ToLower(k)
+			callAuthData[k] = v
+		}
+	}
+	return callAuthData, nil
+}
+
+// NewStream creates a stream and registers it into the transport as "active"
+// streams.
+func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Stream, err error) {
+	ctx = peer.NewContext(ctx, t.getPeer())
+	headerFields, err := t.createHeaderFields(ctx, callHdr)
+	if err != nil {
+		return nil, err
+	}
+	s := t.newStream(ctx, callHdr)
+	cleanup := func(err error) {
+		if s.swapState(streamDone) == streamDone {
+			// If it was already done, return.
+			return
+		}
+		// The stream was unprocessed by the server.
+		atomic.StoreUint32(&s.unprocessed, 1)
+		s.write(recvMsg{err: err})
+		close(s.done)
+		// If headerChan isn't closed, then close it.
+		if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
+			close(s.headerChan)
+		}
+	}
+	hdr := &headerFrame{
+		hf:        headerFields,
+		endStream: false,
+		initStream: func(id uint32) error {
+			t.mu.Lock()
+			if state := t.state; state != reachable {
+				t.mu.Unlock()
+				// Do a quick cleanup.
+				err := error(errStreamDrain)
+				if state == closing {
+					err = ErrConnClosing
+				}
+				cleanup(err)
+				return err
+			}
+			t.activeStreams[id] = s
+			if channelz.IsOn() {
+				atomic.AddInt64(&t.czData.streamsStarted, 1)
+				atomic.StoreInt64(&t.czData.lastStreamCreatedTime, time.Now().UnixNano())
+			}
+			// If the keepalive goroutine has gone dormant, wake it up.
+			if t.kpDormant {
+				t.kpDormancyCond.Signal()
+			}
+			t.mu.Unlock()
+			return nil
+		},
+		onOrphaned: cleanup,
+		wq:         s.wq,
+	}
+	firstTry := true
+	var ch chan struct{}
+	checkForStreamQuota := func(it interface{}) bool {
+		if t.streamQuota <= 0 { // Can go negative if server decreases it.
+			if firstTry {
+				t.waitingStreams++
+			}
+			ch = t.streamsQuotaAvailable
+			return false
+		}
+		if !firstTry {
+			t.waitingStreams--
+		}
+		t.streamQuota--
+		h := it.(*headerFrame)
+		h.streamID = t.nextID
+		t.nextID += 2
+		s.id = h.streamID
+		s.fc = &inFlow{limit: uint32(t.initialWindowSize)}
+		if t.streamQuota > 0 && t.waitingStreams > 0 {
+			select {
+			case t.streamsQuotaAvailable <- struct{}{}:
+			default:
+			}
+		}
+		return true
+	}
+	var hdrListSizeErr error
+	checkForHeaderListSize := func(it interface{}) bool {
+		if t.maxSendHeaderListSize == nil {
+			return true
+		}
+		hdrFrame := it.(*headerFrame)
+		var sz int64
+		for _, f := range hdrFrame.hf {
+			if sz += int64(f.Size()); sz > int64(*t.maxSendHeaderListSize) {
+				hdrListSizeErr = status.Errorf(codes.Internal, "header list size to send violates the maximum size (%d bytes) set by server", *t.maxSendHeaderListSize)
+				return false
+			}
+		}
+		return true
+	}
+	for {
+		success, err := t.controlBuf.executeAndPut(func(it interface{}) bool {
+			if !checkForStreamQuota(it) {
+				return false
+			}
+			if !checkForHeaderListSize(it) {
+				return false
+			}
+			return true
+		}, hdr)
+		if err != nil {
+			return nil, err
+		}
+		if success {
+			break
+		}
+		if hdrListSizeErr != nil {
+			return nil, hdrListSizeErr
+		}
+		firstTry = false
+		select {
+		case <-ch:
+		case <-s.ctx.Done():
+			return nil, ContextErr(s.ctx.Err())
+		case <-t.goAway:
+			return nil, errStreamDrain
+		case <-t.ctx.Done():
+			return nil, ErrConnClosing
+		}
+	}
+	if t.statsHandler != nil {
+		header, _, _ := metadata.FromOutgoingContextRaw(ctx)
+		outHeader := &stats.OutHeader{
+			Client:      true,
+			FullMethod:  callHdr.Method,
+			RemoteAddr:  t.remoteAddr,
+			LocalAddr:   t.localAddr,
+			Compression: callHdr.SendCompress,
+			Header:      header.Copy(),
+		}
+		t.statsHandler.HandleRPC(s.ctx, outHeader)
+	}
+	return s, nil
+}
+
+// CloseStream clears the footprint of a stream when the stream is not needed any more.
+// This must not be executed in reader's goroutine.
+func (t *http2Client) CloseStream(s *Stream, err error) {
+	var (
+		rst     bool
+		rstCode http2.ErrCode
+	)
+	if err != nil {
+		rst = true
+		rstCode = http2.ErrCodeCancel
+	}
+	t.closeStream(s, err, rst, rstCode, status.Convert(err), nil, false)
+}
+
+func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.ErrCode, st *status.Status, mdata map[string][]string, eosReceived bool) {
+	// Set stream status to done.
+	if s.swapState(streamDone) == streamDone {
+		// If it was already done, return.  If multiple closeStream calls
+		// happen simultaneously, wait for the first to finish.
+		<-s.done
+		return
+	}
+	// status and trailers can be updated here without any synchronization because the stream goroutine will
+	// only read it after it sees an io.EOF error from read or write and we'll write those errors
+	// only after updating this.
+	s.status = st
+	if len(mdata) > 0 {
+		s.trailer = mdata
+	}
+	if err != nil {
+		// This will unblock reads eventually.
+		s.write(recvMsg{err: err})
+	}
+	// If headerChan isn't closed, then close it.
+	if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
+		s.noHeaders = true
+		close(s.headerChan)
+	}
+	cleanup := &cleanupStream{
+		streamID: s.id,
+		onWrite: func() {
+			t.mu.Lock()
+			if t.activeStreams != nil {
+				delete(t.activeStreams, s.id)
+			}
+			t.mu.Unlock()
+			if channelz.IsOn() {
+				if eosReceived {
+					atomic.AddInt64(&t.czData.streamsSucceeded, 1)
+				} else {
+					atomic.AddInt64(&t.czData.streamsFailed, 1)
+				}
+			}
+		},
+		rst:     rst,
+		rstCode: rstCode,
+	}
+	addBackStreamQuota := func(interface{}) bool {
+		t.streamQuota++
+		if t.streamQuota > 0 && t.waitingStreams > 0 {
+			select {
+			case t.streamsQuotaAvailable <- struct{}{}:
+			default:
+			}
+		}
+		return true
+	}
+	t.controlBuf.executeAndPut(addBackStreamQuota, cleanup)
+	// This will unblock write.
+	close(s.done)
+}
+
+// Close kicks off the shutdown process of the transport. This should be called
+// only once on a transport. Once it is called, the transport should not be
+// accessed any more.
+//
+// This method blocks until the addrConn that initiated this transport is
+// re-connected. This happens because t.onClose() begins reconnect logic at the
+// addrConn level and blocks until the addrConn is successfully connected.
+func (t *http2Client) Close() error {
+	t.mu.Lock()
+	// Make sure we only Close once.
+	if t.state == closing {
+		t.mu.Unlock()
+		return nil
+	}
+	// Call t.onClose before setting the state to closing to prevent the client
+	// from attempting to create new streams ASAP.
+	t.onClose()
+	t.state = closing
+	streams := t.activeStreams
+	t.activeStreams = nil
+	if t.kpDormant {
+		// If the keepalive goroutine is blocked on this condition variable, we
+		// should unblock it so that the goroutine eventually exits.
+		t.kpDormancyCond.Signal()
+	}
+	t.mu.Unlock()
+	t.controlBuf.finish()
+	t.cancel()
+	err := t.conn.Close()
+	if channelz.IsOn() {
+		channelz.RemoveEntry(t.channelzID)
+	}
+	// Notify all active streams.
+	for _, s := range streams {
+		t.closeStream(s, ErrConnClosing, false, http2.ErrCodeNo, status.New(codes.Unavailable, ErrConnClosing.Desc), nil, false)
+	}
+	if t.statsHandler != nil {
+		connEnd := &stats.ConnEnd{
+			Client: true,
+		}
+		t.statsHandler.HandleConn(t.ctx, connEnd)
+	}
+	return err
+}
+
+// GracefulClose sets the state to draining, which prevents new streams from
+// being created and causes the transport to be closed when the last active
+// stream is closed.  If there are no active streams, the transport is closed
+// immediately.  This does nothing if the transport is already draining or
+// closing.
+func (t *http2Client) GracefulClose() {
+	t.mu.Lock()
+	// Make sure we move to draining only from active.
+	if t.state == draining || t.state == closing {
+		t.mu.Unlock()
+		return
+	}
+	t.state = draining
+	active := len(t.activeStreams)
+	t.mu.Unlock()
+	if active == 0 {
+		t.Close()
+		return
+	}
+	t.controlBuf.put(&incomingGoAway{})
+}
+
+// Write formats the data into HTTP2 data frame(s) and sends it out. The caller
+// should proceed only if Write returns nil.
+func (t *http2Client) Write(s *Stream, hdr []byte, data []byte, opts *Options) error {
+	if opts.Last {
+		// If it's the last message, update stream state.
+		if !s.compareAndSwapState(streamActive, streamWriteDone) {
+			return errStreamDone
+		}
+	} else if s.getState() != streamActive {
+		return errStreamDone
+	}
+	df := &dataFrame{
+		streamID:  s.id,
+		endStream: opts.Last,
+	}
+	if hdr != nil || data != nil { // If it's not an empty data frame.
+		// Add some data to grpc message header so that we can equally
+		// distribute bytes across frames.
+		emptyLen := http2MaxFrameLen - len(hdr)
+		if emptyLen > len(data) {
+			emptyLen = len(data)
+		}
+		hdr = append(hdr, data[:emptyLen]...)
+		data = data[emptyLen:]
+		df.h, df.d = hdr, data
+		// TODO(mmukhi): The above logic in this if can be moved to loopyWriter's data handler.
+		if err := s.wq.get(int32(len(hdr) + len(data))); err != nil {
+			return err
+		}
+	}
+	return t.controlBuf.put(df)
+}
+
+func (t *http2Client) getStream(f http2.Frame) *Stream {
+	t.mu.Lock()
+	s := t.activeStreams[f.Header().StreamID]
+	t.mu.Unlock()
+	return s
+}
+
+// adjustWindow sends out extra window update over the initial window size
+// of stream if the application is requesting data larger in size than
+// the window.
+func (t *http2Client) adjustWindow(s *Stream, n uint32) {
+	if w := s.fc.maybeAdjust(n); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id, increment: w})
+	}
+}
+
+// updateWindow adjusts the inbound quota for the stream.
+// Window updates will be sent out when the cumulative quota
+// exceeds the corresponding threshold.
+func (t *http2Client) updateWindow(s *Stream, n uint32) {
+	if w := s.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id, increment: w})
+	}
+}
+
+// updateFlowControl updates the incoming flow control windows
+// for the transport and the stream based on the current bdp
+// estimation.
+func (t *http2Client) updateFlowControl(n uint32) {
+	t.mu.Lock()
+	for _, s := range t.activeStreams {
+		s.fc.newLimit(n)
+	}
+	t.mu.Unlock()
+	updateIWS := func(interface{}) bool {
+		t.initialWindowSize = int32(n)
+		return true
+	}
+	t.controlBuf.executeAndPut(updateIWS, &outgoingWindowUpdate{streamID: 0, increment: t.fc.newLimit(n)})
+	t.controlBuf.put(&outgoingSettings{
+		ss: []http2.Setting{
+			{
+				ID:  http2.SettingInitialWindowSize,
+				Val: n,
+			},
+		},
+	})
+}
+
+func (t *http2Client) handleData(f *http2.DataFrame) {
+	size := f.Header().Length
+	var sendBDPPing bool
+	if t.bdpEst != nil {
+		sendBDPPing = t.bdpEst.add(size)
+	}
+	// Decouple connection's flow control from application's read.
+	// An update on connection's flow control should not depend on
+	// whether user application has read the data or not. Such a
+	// restriction is already imposed on the stream's flow control,
+	// and therefore the sender will be blocked anyways.
+	// Decoupling the connection flow control will prevent other
+	// active(fast) streams from starving in presence of slow or
+	// inactive streams.
+	//
+	if w := t.fc.onData(size); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{
+			streamID:  0,
+			increment: w,
+		})
+	}
+	if sendBDPPing {
+		// Avoid excessive ping detection (e.g. in an L7 proxy)
+		// by sending a window update prior to the BDP ping.
+
+		if w := t.fc.reset(); w > 0 {
+			t.controlBuf.put(&outgoingWindowUpdate{
+				streamID:  0,
+				increment: w,
+			})
+		}
+
+		t.controlBuf.put(bdpPing)
+	}
+	// Select the right stream to dispatch.
+	s := t.getStream(f)
+	if s == nil {
+		return
+	}
+	if size > 0 {
+		if err := s.fc.onData(size); err != nil {
+			t.closeStream(s, io.EOF, true, http2.ErrCodeFlowControl, status.New(codes.Internal, err.Error()), nil, false)
+			return
+		}
+		if f.Header().Flags.Has(http2.FlagDataPadded) {
+			if w := s.fc.onRead(size - uint32(len(f.Data()))); w > 0 {
+				t.controlBuf.put(&outgoingWindowUpdate{s.id, w})
+			}
+		}
+		// TODO(bradfitz, zhaoq): A copy is required here because there is no
+		// guarantee f.Data() is consumed before the arrival of next frame.
+		// Can this copy be eliminated?
+		if len(f.Data()) > 0 {
+			buffer := t.bufferPool.get()
+			buffer.Reset()
+			buffer.Write(f.Data())
+			s.write(recvMsg{buffer: buffer})
+		}
+	}
+	// The server has closed the stream without sending trailers.  Record that
+	// the read direction is closed, and set the status appropriately.
+	if f.FrameHeader.Flags.Has(http2.FlagDataEndStream) {
+		t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.New(codes.Internal, "server closed the stream without sending trailers"), nil, true)
+	}
+}
+
+func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
+	s := t.getStream(f)
+	if s == nil {
+		return
+	}
+	if f.ErrCode == http2.ErrCodeRefusedStream {
+		// The stream was unprocessed by the server.
+		atomic.StoreUint32(&s.unprocessed, 1)
+	}
+	statusCode, ok := http2ErrConvTab[f.ErrCode]
+	if !ok {
+		warningf("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error %v", f.ErrCode)
+		statusCode = codes.Unknown
+	}
+	if statusCode == codes.Canceled {
+		if d, ok := s.ctx.Deadline(); ok && !d.After(time.Now()) {
+			// Our deadline was already exceeded, and that was likely the cause
+			// of this cancelation.  Alter the status code accordingly.
+			statusCode = codes.DeadlineExceeded
+		}
+	}
+	t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.Newf(statusCode, "stream terminated by RST_STREAM with error code: %v", f.ErrCode), nil, false)
+}
+
+func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
+	if f.IsAck() {
+		return
+	}
+	var maxStreams *uint32
+	var ss []http2.Setting
+	var updateFuncs []func()
+	f.ForeachSetting(func(s http2.Setting) error {
+		switch s.ID {
+		case http2.SettingMaxConcurrentStreams:
+			maxStreams = new(uint32)
+			*maxStreams = s.Val
+		case http2.SettingMaxHeaderListSize:
+			updateFuncs = append(updateFuncs, func() {
+				t.maxSendHeaderListSize = new(uint32)
+				*t.maxSendHeaderListSize = s.Val
+			})
+		default:
+			ss = append(ss, s)
+		}
+		return nil
+	})
+	if isFirst && maxStreams == nil {
+		maxStreams = new(uint32)
+		*maxStreams = math.MaxUint32
+	}
+	sf := &incomingSettings{
+		ss: ss,
+	}
+	if maxStreams != nil {
+		updateStreamQuota := func() {
+			delta := int64(*maxStreams) - int64(t.maxConcurrentStreams)
+			t.maxConcurrentStreams = *maxStreams
+			t.streamQuota += delta
+			if delta > 0 && t.waitingStreams > 0 {
+				close(t.streamsQuotaAvailable) // wake all of them up.
+				t.streamsQuotaAvailable = make(chan struct{}, 1)
+			}
+		}
+		updateFuncs = append(updateFuncs, updateStreamQuota)
+	}
+	t.controlBuf.executeAndPut(func(interface{}) bool {
+		for _, f := range updateFuncs {
+			f()
+		}
+		return true
+	}, sf)
+}
+
+func (t *http2Client) handlePing(f *http2.PingFrame) {
+	if f.IsAck() {
+		// Maybe it's a BDP ping.
+		if t.bdpEst != nil {
+			t.bdpEst.calculate(f.Data)
+		}
+		return
+	}
+	pingAck := &ping{ack: true}
+	copy(pingAck.data[:], f.Data[:])
+	t.controlBuf.put(pingAck)
+}
+
+func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
+	t.mu.Lock()
+	if t.state == closing {
+		t.mu.Unlock()
+		return
+	}
+	if f.ErrCode == http2.ErrCodeEnhanceYourCalm {
+		infof("Client received GoAway with http2.ErrCodeEnhanceYourCalm.")
+	}
+	id := f.LastStreamID
+	if id > 0 && id%2 != 1 {
+		t.mu.Unlock()
+		t.Close()
+		return
+	}
+	// A client can receive multiple GoAways from the server (see
+	// https://github.com/grpc/grpc-go/issues/1387).  The idea is that the first
+	// GoAway will be sent with an ID of MaxInt32 and the second GoAway will be
+	// sent after an RTT delay with the ID of the last stream the server will
+	// process.
+	//
+	// Therefore, when we get the first GoAway we don't necessarily close any
+	// streams. While in case of second GoAway we close all streams created after
+	// the GoAwayId. This way streams that were in-flight while the GoAway from
+	// server was being sent don't get killed.
+	select {
+	case <-t.goAway: // t.goAway has been closed (i.e.,multiple GoAways).
+		// If there are multiple GoAways the first one should always have an ID greater than the following ones.
+		if id > t.prevGoAwayID {
+			t.mu.Unlock()
+			t.Close()
+			return
+		}
+	default:
+		t.setGoAwayReason(f)
+		close(t.goAway)
+		t.controlBuf.put(&incomingGoAway{})
+		// Notify the clientconn about the GOAWAY before we set the state to
+		// draining, to allow the client to stop attempting to create streams
+		// before disallowing new streams on this connection.
+		t.onGoAway(t.goAwayReason)
+		t.state = draining
+	}
+	// All streams with IDs greater than the GoAwayId
+	// and smaller than the previous GoAway ID should be killed.
+	upperLimit := t.prevGoAwayID
+	if upperLimit == 0 { // This is the first GoAway Frame.
+		upperLimit = math.MaxUint32 // Kill all streams after the GoAway ID.
+	}
+	for streamID, stream := range t.activeStreams {
+		if streamID > id && streamID <= upperLimit {
+			// The stream was unprocessed by the server.
+			atomic.StoreUint32(&stream.unprocessed, 1)
+			t.closeStream(stream, errStreamDrain, false, http2.ErrCodeNo, statusGoAway, nil, false)
+		}
+	}
+	t.prevGoAwayID = id
+	active := len(t.activeStreams)
+	t.mu.Unlock()
+	if active == 0 {
+		t.Close()
+	}
+}
+
+// setGoAwayReason sets the value of t.goAwayReason based
+// on the GoAway frame received.
+// It expects a lock on transport's mutext to be held by
+// the caller.
+func (t *http2Client) setGoAwayReason(f *http2.GoAwayFrame) {
+	t.goAwayReason = GoAwayNoReason
+	switch f.ErrCode {
+	case http2.ErrCodeEnhanceYourCalm:
+		if string(f.DebugData()) == "too_many_pings" {
+			t.goAwayReason = GoAwayTooManyPings
+		}
+	}
+}
+
+func (t *http2Client) GetGoAwayReason() GoAwayReason {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.goAwayReason
+}
+
+func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
+	t.controlBuf.put(&incomingWindowUpdate{
+		streamID:  f.Header().StreamID,
+		increment: f.Increment,
+	})
+}
+
+// operateHeaders takes action on the decoded headers.
+func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
+	s := t.getStream(frame)
+	if s == nil {
+		return
+	}
+	endStream := frame.StreamEnded()
+	atomic.StoreUint32(&s.bytesReceived, 1)
+	initialHeader := atomic.LoadUint32(&s.headerChanClosed) == 0
+
+	if !initialHeader && !endStream {
+		// As specified by gRPC over HTTP2, a HEADERS frame (and associated CONTINUATION frames) can only appear at the start or end of a stream. Therefore, second HEADERS frame must have EOS bit set.
+		st := status.New(codes.Internal, "a HEADERS frame cannot appear in the middle of a stream")
+		t.closeStream(s, st.Err(), true, http2.ErrCodeProtocol, st, nil, false)
+		return
+	}
+
+	state := &decodeState{}
+	// Initialize isGRPC value to be !initialHeader, since if a gRPC Response-Headers has already been received, then it means that the peer is speaking gRPC and we are in gRPC mode.
+	state.data.isGRPC = !initialHeader
+	if err := state.decodeHeader(frame); err != nil {
+		t.closeStream(s, err, true, http2.ErrCodeProtocol, status.Convert(err), nil, endStream)
+		return
+	}
+
+	isHeader := false
+	defer func() {
+		if t.statsHandler != nil {
+			if isHeader {
+				inHeader := &stats.InHeader{
+					Client:     true,
+					WireLength: int(frame.Header().Length),
+					Header:     s.header.Copy(),
+				}
+				t.statsHandler.HandleRPC(s.ctx, inHeader)
+			} else {
+				inTrailer := &stats.InTrailer{
+					Client:     true,
+					WireLength: int(frame.Header().Length),
+					Trailer:    s.trailer.Copy(),
+				}
+				t.statsHandler.HandleRPC(s.ctx, inTrailer)
+			}
+		}
+	}()
+
+	// If headerChan hasn't been closed yet
+	if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
+		s.headerValid = true
+		if !endStream {
+			// HEADERS frame block carries a Response-Headers.
+			isHeader = true
+			// These values can be set without any synchronization because
+			// stream goroutine will read it only after seeing a closed
+			// headerChan which we'll close after setting this.
+			s.recvCompress = state.data.encoding
+			if len(state.data.mdata) > 0 {
+				s.header = state.data.mdata
+			}
+		} else {
+			// HEADERS frame block carries a Trailers-Only.
+			s.noHeaders = true
+		}
+		close(s.headerChan)
+	}
+
+	if !endStream {
+		return
+	}
+
+	// if client received END_STREAM from server while stream was still active, send RST_STREAM
+	rst := s.getState() == streamActive
+	t.closeStream(s, io.EOF, rst, http2.ErrCodeNo, state.status(), state.data.mdata, true)
+}
+
+// reader runs as a separate goroutine in charge of reading data from network
+// connection.
+//
+// TODO(zhaoq): currently one reader per transport. Investigate whether this is
+// optimal.
+// TODO(zhaoq): Check the validity of the incoming frame sequence.
+func (t *http2Client) reader() {
+	defer close(t.readerDone)
+	// Check the validity of server preface.
+	frame, err := t.framer.fr.ReadFrame()
+	if err != nil {
+		t.Close() // this kicks off resetTransport, so must be last before return
+		return
+	}
+	t.conn.SetReadDeadline(time.Time{}) // reset deadline once we get the settings frame (we didn't time out, yay!)
+	if t.keepaliveEnabled {
+		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+	}
+	sf, ok := frame.(*http2.SettingsFrame)
+	if !ok {
+		t.Close() // this kicks off resetTransport, so must be last before return
+		return
+	}
+	t.onPrefaceReceipt()
+	t.handleSettings(sf, true)
+
+	// loop to keep reading incoming messages on this transport.
+	for {
+		t.controlBuf.throttle()
+		frame, err := t.framer.fr.ReadFrame()
+		if t.keepaliveEnabled {
+			atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+		}
+		if err != nil {
+			// Abort an active stream if the http2.Framer returns a
+			// http2.StreamError. This can happen only if the server's response
+			// is malformed http2.
+			if se, ok := err.(http2.StreamError); ok {
+				t.mu.Lock()
+				s := t.activeStreams[se.StreamID]
+				t.mu.Unlock()
+				if s != nil {
+					// use error detail to provide better err message
+					code := http2ErrConvTab[se.Code]
+					msg := t.framer.fr.ErrorDetail().Error()
+					t.closeStream(s, status.Error(code, msg), true, http2.ErrCodeProtocol, status.New(code, msg), nil, false)
+				}
+				continue
+			} else {
+				// Transport error.
+				t.Close()
+				return
+			}
+		}
+		switch frame := frame.(type) {
+		case *http2.MetaHeadersFrame:
+			t.operateHeaders(frame)
+		case *http2.DataFrame:
+			t.handleData(frame)
+		case *http2.RSTStreamFrame:
+			t.handleRSTStream(frame)
+		case *http2.SettingsFrame:
+			t.handleSettings(frame, false)
+		case *http2.PingFrame:
+			t.handlePing(frame)
+		case *http2.GoAwayFrame:
+			t.handleGoAway(frame)
+		case *http2.WindowUpdateFrame:
+			t.handleWindowUpdate(frame)
+		default:
+			errorf("transport: http2Client.reader got unhandled frame type %v.", frame)
+		}
+	}
+}
+
+func minTime(a, b time.Duration) time.Duration {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+// keepalive running in a separate goroutune makes sure the connection is alive by sending pings.
+func (t *http2Client) keepalive() {
+	p := &ping{data: [8]byte{}}
+	// True iff a ping has been sent, and no data has been received since then.
+	outstandingPing := false
+	// Amount of time remaining before which we should receive an ACK for the
+	// last sent ping.
+	timeoutLeft := time.Duration(0)
+	// Records the last value of t.lastRead before we go block on the timer.
+	// This is required to check for read activity since then.
+	prevNano := time.Now().UnixNano()
+	timer := time.NewTimer(t.kp.Time)
+	for {
+		select {
+		case <-timer.C:
+			lastRead := atomic.LoadInt64(&t.lastRead)
+			if lastRead > prevNano {
+				// There has been read activity since the last time we were here.
+				outstandingPing = false
+				// Next timer should fire at kp.Time seconds from lastRead time.
+				timer.Reset(time.Duration(lastRead) + t.kp.Time - time.Duration(time.Now().UnixNano()))
+				prevNano = lastRead
+				continue
+			}
+			if outstandingPing && timeoutLeft <= 0 {
+				t.Close()
+				return
+			}
+			t.mu.Lock()
+			if t.state == closing {
+				// If the transport is closing, we should exit from the
+				// keepalive goroutine here. If not, we could have a race
+				// between the call to Signal() from Close() and the call to
+				// Wait() here, whereby the keepalive goroutine ends up
+				// blocking on the condition variable which will never be
+				// signalled again.
+				t.mu.Unlock()
+				return
+			}
+			if len(t.activeStreams) < 1 && !t.kp.PermitWithoutStream {
+				// If a ping was sent out previously (because there were active
+				// streams at that point) which wasn't acked and its timeout
+				// hadn't fired, but we got here and are about to go dormant,
+				// we should make sure that we unconditionally send a ping once
+				// we awaken.
+				outstandingPing = false
+				t.kpDormant = true
+				t.kpDormancyCond.Wait()
+			}
+			t.kpDormant = false
+			t.mu.Unlock()
+
+			// We get here either because we were dormant and a new stream was
+			// created which unblocked the Wait() call, or because the
+			// keepalive timer expired. In both cases, we need to send a ping.
+			if !outstandingPing {
+				if channelz.IsOn() {
+					atomic.AddInt64(&t.czData.kpCount, 1)
+				}
+				t.controlBuf.put(p)
+				timeoutLeft = t.kp.Timeout
+				outstandingPing = true
+			}
+			// The amount of time to sleep here is the minimum of kp.Time and
+			// timeoutLeft. This will ensure that we wait only for kp.Time
+			// before sending out the next ping (for cases where the ping is
+			// acked).
+			sleepDuration := minTime(t.kp.Time, timeoutLeft)
+			timeoutLeft -= sleepDuration
+			timer.Reset(sleepDuration)
+		case <-t.ctx.Done():
+			if !timer.Stop() {
+				<-timer.C
+			}
+			return
+		}
+	}
+}
+
+func (t *http2Client) Error() <-chan struct{} {
+	return t.ctx.Done()
+}
+
+func (t *http2Client) GoAway() <-chan struct{} {
+	return t.goAway
+}
+
+func (t *http2Client) ChannelzMetric() *channelz.SocketInternalMetric {
+	s := channelz.SocketInternalMetric{
+		StreamsStarted:                  atomic.LoadInt64(&t.czData.streamsStarted),
+		StreamsSucceeded:                atomic.LoadInt64(&t.czData.streamsSucceeded),
+		StreamsFailed:                   atomic.LoadInt64(&t.czData.streamsFailed),
+		MessagesSent:                    atomic.LoadInt64(&t.czData.msgSent),
+		MessagesReceived:                atomic.LoadInt64(&t.czData.msgRecv),
+		KeepAlivesSent:                  atomic.LoadInt64(&t.czData.kpCount),
+		LastLocalStreamCreatedTimestamp: time.Unix(0, atomic.LoadInt64(&t.czData.lastStreamCreatedTime)),
+		LastMessageSentTimestamp:        time.Unix(0, atomic.LoadInt64(&t.czData.lastMsgSentTime)),
+		LastMessageReceivedTimestamp:    time.Unix(0, atomic.LoadInt64(&t.czData.lastMsgRecvTime)),
+		LocalFlowControlWindow:          int64(t.fc.getSize()),
+		SocketOptions:                   channelz.GetSocketOption(t.conn),
+		LocalAddr:                       t.localAddr,
+		RemoteAddr:                      t.remoteAddr,
+		// RemoteName :
+	}
+	if au, ok := t.authInfo.(credentials.ChannelzSecurityInfo); ok {
+		s.Security = au.GetSecurityValue()
+	}
+	s.RemoteFlowControlWindow = t.getOutFlowWindow()
+	return &s
+}
+
+func (t *http2Client) RemoteAddr() net.Addr { return t.remoteAddr }
+
+func (t *http2Client) IncrMsgSent() {
+	atomic.AddInt64(&t.czData.msgSent, 1)
+	atomic.StoreInt64(&t.czData.lastMsgSentTime, time.Now().UnixNano())
+}
+
+func (t *http2Client) IncrMsgRecv() {
+	atomic.AddInt64(&t.czData.msgRecv, 1)
+	atomic.StoreInt64(&t.czData.lastMsgRecvTime, time.Now().UnixNano())
+}
+
+func (t *http2Client) getOutFlowWindow() int64 {
+	resp := make(chan uint32, 1)
+	timer := time.NewTimer(time.Second)
+	defer timer.Stop()
+	t.controlBuf.put(&outFlowControlSizeRequest{resp})
+	select {
+	case sz := <-resp:
+		return int64(sz)
+	case <-t.ctxDone:
+		return -1
+	case <-timer.C:
+		return -2
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_server.go b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
new file mode 100644
index 0000000..8b04b03
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -0,0 +1,1253 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
+
+	spb "google.golang.org/genproto/googleapis/rpc/status"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/tap"
+)
+
+var (
+	// ErrIllegalHeaderWrite indicates that setting header is illegal because of
+	// the stream's state.
+	ErrIllegalHeaderWrite = errors.New("transport: the stream is done or WriteHeader was already called")
+	// ErrHeaderListSizeLimitViolation indicates that the header list size is larger
+	// than the limit set by peer.
+	ErrHeaderListSizeLimitViolation = errors.New("transport: trying to send header list size larger than the limit set by peer")
+	// statusRawProto is a function to get to the raw status proto wrapped in a
+	// status.Status without a proto.Clone().
+	statusRawProto = internal.StatusRawProto.(func(*status.Status) *spb.Status)
+)
+
+// serverConnectionCounter counts the number of connections a server has seen
+// (equal to the number of http2Servers created). Must be accessed atomically.
+var serverConnectionCounter uint64
+
+// http2Server implements the ServerTransport interface with HTTP2.
+type http2Server struct {
+	lastRead    int64 // Keep this field 64-bit aligned. Accessed atomically.
+	ctx         context.Context
+	done        chan struct{}
+	conn        net.Conn
+	loopy       *loopyWriter
+	readerDone  chan struct{} // sync point to enable testing.
+	writerDone  chan struct{} // sync point to enable testing.
+	remoteAddr  net.Addr
+	localAddr   net.Addr
+	maxStreamID uint32               // max stream ID ever seen
+	authInfo    credentials.AuthInfo // auth info about the connection
+	inTapHandle tap.ServerInHandle
+	framer      *framer
+	// The max number of concurrent streams.
+	maxStreams uint32
+	// controlBuf delivers all the control related tasks (e.g., window
+	// updates, reset streams, and various settings) to the controller.
+	controlBuf *controlBuffer
+	fc         *trInFlow
+	stats      stats.Handler
+	// Keepalive and max-age parameters for the server.
+	kp keepalive.ServerParameters
+	// Keepalive enforcement policy.
+	kep keepalive.EnforcementPolicy
+	// The time instance last ping was received.
+	lastPingAt time.Time
+	// Number of times the client has violated keepalive ping policy so far.
+	pingStrikes uint8
+	// Flag to signify that number of ping strikes should be reset to 0.
+	// This is set whenever data or header frames are sent.
+	// 1 means yes.
+	resetPingStrikes      uint32 // Accessed atomically.
+	initialWindowSize     int32
+	bdpEst                *bdpEstimator
+	maxSendHeaderListSize *uint32
+
+	mu sync.Mutex // guard the following
+
+	// drainChan is initialized when drain(...) is called the first time.
+	// After which the server writes out the first GoAway(with ID 2^31-1) frame.
+	// Then an independent goroutine will be launched to later send the second GoAway.
+	// During this time we don't want to write another first GoAway(with ID 2^31 -1) frame.
+	// Thus call to drain(...) will be a no-op if drainChan is already initialized since draining is
+	// already underway.
+	drainChan     chan struct{}
+	state         transportState
+	activeStreams map[uint32]*Stream
+	// idle is the time instant when the connection went idle.
+	// This is either the beginning of the connection or when the number of
+	// RPCs go down to 0.
+	// When the connection is busy, this value is set to 0.
+	idle time.Time
+
+	// Fields below are for channelz metric collection.
+	channelzID int64 // channelz unique identification number
+	czData     *channelzData
+	bufferPool *bufferPool
+
+	connectionID uint64
+}
+
+// newHTTP2Server constructs a ServerTransport based on HTTP2. ConnectionError is
+// returned if something goes wrong.
+func newHTTP2Server(conn net.Conn, config *ServerConfig) (_ ServerTransport, err error) {
+	writeBufSize := config.WriteBufferSize
+	readBufSize := config.ReadBufferSize
+	maxHeaderListSize := defaultServerMaxHeaderListSize
+	if config.MaxHeaderListSize != nil {
+		maxHeaderListSize = *config.MaxHeaderListSize
+	}
+	framer := newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize)
+	// Send initial settings as connection preface to client.
+	isettings := []http2.Setting{{
+		ID:  http2.SettingMaxFrameSize,
+		Val: http2MaxFrameLen,
+	}}
+	// TODO(zhaoq): Have a better way to signal "no limit" because 0 is
+	// permitted in the HTTP2 spec.
+	maxStreams := config.MaxStreams
+	if maxStreams == 0 {
+		maxStreams = math.MaxUint32
+	} else {
+		isettings = append(isettings, http2.Setting{
+			ID:  http2.SettingMaxConcurrentStreams,
+			Val: maxStreams,
+		})
+	}
+	dynamicWindow := true
+	iwz := int32(initialWindowSize)
+	if config.InitialWindowSize >= defaultWindowSize {
+		iwz = config.InitialWindowSize
+		dynamicWindow = false
+	}
+	icwz := int32(initialWindowSize)
+	if config.InitialConnWindowSize >= defaultWindowSize {
+		icwz = config.InitialConnWindowSize
+		dynamicWindow = false
+	}
+	if iwz != defaultWindowSize {
+		isettings = append(isettings, http2.Setting{
+			ID:  http2.SettingInitialWindowSize,
+			Val: uint32(iwz)})
+	}
+	if config.MaxHeaderListSize != nil {
+		isettings = append(isettings, http2.Setting{
+			ID:  http2.SettingMaxHeaderListSize,
+			Val: *config.MaxHeaderListSize,
+		})
+	}
+	if config.HeaderTableSize != nil {
+		isettings = append(isettings, http2.Setting{
+			ID:  http2.SettingHeaderTableSize,
+			Val: *config.HeaderTableSize,
+		})
+	}
+	if err := framer.fr.WriteSettings(isettings...); err != nil {
+		return nil, connectionErrorf(false, err, "transport: %v", err)
+	}
+	// Adjust the connection flow control window if needed.
+	if delta := uint32(icwz - defaultWindowSize); delta > 0 {
+		if err := framer.fr.WriteWindowUpdate(0, delta); err != nil {
+			return nil, connectionErrorf(false, err, "transport: %v", err)
+		}
+	}
+	kp := config.KeepaliveParams
+	if kp.MaxConnectionIdle == 0 {
+		kp.MaxConnectionIdle = defaultMaxConnectionIdle
+	}
+	if kp.MaxConnectionAge == 0 {
+		kp.MaxConnectionAge = defaultMaxConnectionAge
+	}
+	// Add a jitter to MaxConnectionAge.
+	kp.MaxConnectionAge += getJitter(kp.MaxConnectionAge)
+	if kp.MaxConnectionAgeGrace == 0 {
+		kp.MaxConnectionAgeGrace = defaultMaxConnectionAgeGrace
+	}
+	if kp.Time == 0 {
+		kp.Time = defaultServerKeepaliveTime
+	}
+	if kp.Timeout == 0 {
+		kp.Timeout = defaultServerKeepaliveTimeout
+	}
+	kep := config.KeepalivePolicy
+	if kep.MinTime == 0 {
+		kep.MinTime = defaultKeepalivePolicyMinTime
+	}
+	done := make(chan struct{})
+	t := &http2Server{
+		ctx:               context.Background(),
+		done:              done,
+		conn:              conn,
+		remoteAddr:        conn.RemoteAddr(),
+		localAddr:         conn.LocalAddr(),
+		authInfo:          config.AuthInfo,
+		framer:            framer,
+		readerDone:        make(chan struct{}),
+		writerDone:        make(chan struct{}),
+		maxStreams:        maxStreams,
+		inTapHandle:       config.InTapHandle,
+		fc:                &trInFlow{limit: uint32(icwz)},
+		state:             reachable,
+		activeStreams:     make(map[uint32]*Stream),
+		stats:             config.StatsHandler,
+		kp:                kp,
+		idle:              time.Now(),
+		kep:               kep,
+		initialWindowSize: iwz,
+		czData:            new(channelzData),
+		bufferPool:        newBufferPool(),
+	}
+	t.controlBuf = newControlBuffer(t.done)
+	if dynamicWindow {
+		t.bdpEst = &bdpEstimator{
+			bdp:               initialWindowSize,
+			updateFlowControl: t.updateFlowControl,
+		}
+	}
+	if t.stats != nil {
+		t.ctx = t.stats.TagConn(t.ctx, &stats.ConnTagInfo{
+			RemoteAddr: t.remoteAddr,
+			LocalAddr:  t.localAddr,
+		})
+		connBegin := &stats.ConnBegin{}
+		t.stats.HandleConn(t.ctx, connBegin)
+	}
+	if channelz.IsOn() {
+		t.channelzID = channelz.RegisterNormalSocket(t, config.ChannelzParentID, fmt.Sprintf("%s -> %s", t.remoteAddr, t.localAddr))
+	}
+
+	t.connectionID = atomic.AddUint64(&serverConnectionCounter, 1)
+
+	t.framer.writer.Flush()
+
+	defer func() {
+		if err != nil {
+			t.Close()
+		}
+	}()
+
+	// Check the validity of client preface.
+	preface := make([]byte, len(clientPreface))
+	if _, err := io.ReadFull(t.conn, preface); err != nil {
+		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
+	}
+	if !bytes.Equal(preface, clientPreface) {
+		return nil, connectionErrorf(false, nil, "transport: http2Server.HandleStreams received bogus greeting from client: %q", preface)
+	}
+
+	frame, err := t.framer.fr.ReadFrame()
+	if err == io.EOF || err == io.ErrUnexpectedEOF {
+		return nil, err
+	}
+	if err != nil {
+		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to read initial settings frame: %v", err)
+	}
+	atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+	sf, ok := frame.(*http2.SettingsFrame)
+	if !ok {
+		return nil, connectionErrorf(false, nil, "transport: http2Server.HandleStreams saw invalid preface type %T from client", frame)
+	}
+	t.handleSettings(sf)
+
+	go func() {
+		t.loopy = newLoopyWriter(serverSide, t.framer, t.controlBuf, t.bdpEst)
+		t.loopy.ssGoAwayHandler = t.outgoingGoAwayHandler
+		if err := t.loopy.run(); err != nil {
+			errorf("transport: loopyWriter.run returning. Err: %v", err)
+		}
+		t.conn.Close()
+		close(t.writerDone)
+	}()
+	go t.keepalive()
+	return t, nil
+}
+
+// operateHeader takes action on the decoded headers.
+func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream), traceCtx func(context.Context, string) context.Context) (fatal bool) {
+	streamID := frame.Header().StreamID
+	state := &decodeState{
+		serverSide: true,
+	}
+	if err := state.decodeHeader(frame); err != nil {
+		if se, ok := status.FromError(err); ok {
+			t.controlBuf.put(&cleanupStream{
+				streamID: streamID,
+				rst:      true,
+				rstCode:  statusCodeConvTab[se.Code()],
+				onWrite:  func() {},
+			})
+		}
+		return false
+	}
+
+	buf := newRecvBuffer()
+	s := &Stream{
+		id:             streamID,
+		st:             t,
+		buf:            buf,
+		fc:             &inFlow{limit: uint32(t.initialWindowSize)},
+		recvCompress:   state.data.encoding,
+		method:         state.data.method,
+		contentSubtype: state.data.contentSubtype,
+	}
+	if frame.StreamEnded() {
+		// s is just created by the caller. No lock needed.
+		s.state = streamReadDone
+	}
+	if state.data.timeoutSet {
+		s.ctx, s.cancel = context.WithTimeout(t.ctx, state.data.timeout)
+	} else {
+		s.ctx, s.cancel = context.WithCancel(t.ctx)
+	}
+	pr := &peer.Peer{
+		Addr: t.remoteAddr,
+	}
+	// Attach Auth info if there is any.
+	if t.authInfo != nil {
+		pr.AuthInfo = t.authInfo
+	}
+	s.ctx = peer.NewContext(s.ctx, pr)
+	// Attach the received metadata to the context.
+	if len(state.data.mdata) > 0 {
+		s.ctx = metadata.NewIncomingContext(s.ctx, state.data.mdata)
+	}
+	if state.data.statsTags != nil {
+		s.ctx = stats.SetIncomingTags(s.ctx, state.data.statsTags)
+	}
+	if state.data.statsTrace != nil {
+		s.ctx = stats.SetIncomingTrace(s.ctx, state.data.statsTrace)
+	}
+	if t.inTapHandle != nil {
+		var err error
+		info := &tap.Info{
+			FullMethodName: state.data.method,
+		}
+		s.ctx, err = t.inTapHandle(s.ctx, info)
+		if err != nil {
+			warningf("transport: http2Server.operateHeaders got an error from InTapHandle: %v", err)
+			t.controlBuf.put(&cleanupStream{
+				streamID: s.id,
+				rst:      true,
+				rstCode:  http2.ErrCodeRefusedStream,
+				onWrite:  func() {},
+			})
+			s.cancel()
+			return false
+		}
+	}
+	t.mu.Lock()
+	if t.state != reachable {
+		t.mu.Unlock()
+		s.cancel()
+		return false
+	}
+	if uint32(len(t.activeStreams)) >= t.maxStreams {
+		t.mu.Unlock()
+		t.controlBuf.put(&cleanupStream{
+			streamID: streamID,
+			rst:      true,
+			rstCode:  http2.ErrCodeRefusedStream,
+			onWrite:  func() {},
+		})
+		s.cancel()
+		return false
+	}
+	if streamID%2 != 1 || streamID <= t.maxStreamID {
+		t.mu.Unlock()
+		// illegal gRPC stream id.
+		errorf("transport: http2Server.HandleStreams received an illegal stream id: %v", streamID)
+		s.cancel()
+		return true
+	}
+	t.maxStreamID = streamID
+	t.activeStreams[streamID] = s
+	if len(t.activeStreams) == 1 {
+		t.idle = time.Time{}
+	}
+	t.mu.Unlock()
+	if channelz.IsOn() {
+		atomic.AddInt64(&t.czData.streamsStarted, 1)
+		atomic.StoreInt64(&t.czData.lastStreamCreatedTime, time.Now().UnixNano())
+	}
+	s.requestRead = func(n int) {
+		t.adjustWindow(s, uint32(n))
+	}
+	s.ctx = traceCtx(s.ctx, s.method)
+	if t.stats != nil {
+		s.ctx = t.stats.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
+		inHeader := &stats.InHeader{
+			FullMethod:  s.method,
+			RemoteAddr:  t.remoteAddr,
+			LocalAddr:   t.localAddr,
+			Compression: s.recvCompress,
+			WireLength:  int(frame.Header().Length),
+			Header:      metadata.MD(state.data.mdata).Copy(),
+		}
+		t.stats.HandleRPC(s.ctx, inHeader)
+	}
+	s.ctxDone = s.ctx.Done()
+	s.wq = newWriteQuota(defaultWriteQuota, s.ctxDone)
+	s.trReader = &transportReader{
+		reader: &recvBufferReader{
+			ctx:        s.ctx,
+			ctxDone:    s.ctxDone,
+			recv:       s.buf,
+			freeBuffer: t.bufferPool.put,
+		},
+		windowHandler: func(n int) {
+			t.updateWindow(s, uint32(n))
+		},
+	}
+	// Register the stream with loopy.
+	t.controlBuf.put(&registerStream{
+		streamID: s.id,
+		wq:       s.wq,
+	})
+	handle(s)
+	return false
+}
+
+// HandleStreams receives incoming streams using the given handler. This is
+// typically run in a separate goroutine.
+// traceCtx attaches trace to ctx and returns the new context.
+func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.Context, string) context.Context) {
+	defer close(t.readerDone)
+	for {
+		t.controlBuf.throttle()
+		frame, err := t.framer.fr.ReadFrame()
+		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+		if err != nil {
+			if se, ok := err.(http2.StreamError); ok {
+				warningf("transport: http2Server.HandleStreams encountered http2.StreamError: %v", se)
+				t.mu.Lock()
+				s := t.activeStreams[se.StreamID]
+				t.mu.Unlock()
+				if s != nil {
+					t.closeStream(s, true, se.Code, false)
+				} else {
+					t.controlBuf.put(&cleanupStream{
+						streamID: se.StreamID,
+						rst:      true,
+						rstCode:  se.Code,
+						onWrite:  func() {},
+					})
+				}
+				continue
+			}
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				t.Close()
+				return
+			}
+			warningf("transport: http2Server.HandleStreams failed to read frame: %v", err)
+			t.Close()
+			return
+		}
+		switch frame := frame.(type) {
+		case *http2.MetaHeadersFrame:
+			if t.operateHeaders(frame, handle, traceCtx) {
+				t.Close()
+				break
+			}
+		case *http2.DataFrame:
+			t.handleData(frame)
+		case *http2.RSTStreamFrame:
+			t.handleRSTStream(frame)
+		case *http2.SettingsFrame:
+			t.handleSettings(frame)
+		case *http2.PingFrame:
+			t.handlePing(frame)
+		case *http2.WindowUpdateFrame:
+			t.handleWindowUpdate(frame)
+		case *http2.GoAwayFrame:
+			// TODO: Handle GoAway from the client appropriately.
+		default:
+			errorf("transport: http2Server.HandleStreams found unhandled frame type %v.", frame)
+		}
+	}
+}
+
+func (t *http2Server) getStream(f http2.Frame) (*Stream, bool) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if t.activeStreams == nil {
+		// The transport is closing.
+		return nil, false
+	}
+	s, ok := t.activeStreams[f.Header().StreamID]
+	if !ok {
+		// The stream is already done.
+		return nil, false
+	}
+	return s, true
+}
+
+// adjustWindow sends out extra window update over the initial window size
+// of stream if the application is requesting data larger in size than
+// the window.
+func (t *http2Server) adjustWindow(s *Stream, n uint32) {
+	if w := s.fc.maybeAdjust(n); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id, increment: w})
+	}
+
+}
+
+// updateWindow adjusts the inbound quota for the stream and the transport.
+// Window updates will deliver to the controller for sending when
+// the cumulative quota exceeds the corresponding threshold.
+func (t *http2Server) updateWindow(s *Stream, n uint32) {
+	if w := s.fc.onRead(n); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{streamID: s.id,
+			increment: w,
+		})
+	}
+}
+
+// updateFlowControl updates the incoming flow control windows
+// for the transport and the stream based on the current bdp
+// estimation.
+func (t *http2Server) updateFlowControl(n uint32) {
+	t.mu.Lock()
+	for _, s := range t.activeStreams {
+		s.fc.newLimit(n)
+	}
+	t.initialWindowSize = int32(n)
+	t.mu.Unlock()
+	t.controlBuf.put(&outgoingWindowUpdate{
+		streamID:  0,
+		increment: t.fc.newLimit(n),
+	})
+	t.controlBuf.put(&outgoingSettings{
+		ss: []http2.Setting{
+			{
+				ID:  http2.SettingInitialWindowSize,
+				Val: n,
+			},
+		},
+	})
+
+}
+
+func (t *http2Server) handleData(f *http2.DataFrame) {
+	size := f.Header().Length
+	var sendBDPPing bool
+	if t.bdpEst != nil {
+		sendBDPPing = t.bdpEst.add(size)
+	}
+	// Decouple connection's flow control from application's read.
+	// An update on connection's flow control should not depend on
+	// whether user application has read the data or not. Such a
+	// restriction is already imposed on the stream's flow control,
+	// and therefore the sender will be blocked anyways.
+	// Decoupling the connection flow control will prevent other
+	// active(fast) streams from starving in presence of slow or
+	// inactive streams.
+	if w := t.fc.onData(size); w > 0 {
+		t.controlBuf.put(&outgoingWindowUpdate{
+			streamID:  0,
+			increment: w,
+		})
+	}
+	if sendBDPPing {
+		// Avoid excessive ping detection (e.g. in an L7 proxy)
+		// by sending a window update prior to the BDP ping.
+		if w := t.fc.reset(); w > 0 {
+			t.controlBuf.put(&outgoingWindowUpdate{
+				streamID:  0,
+				increment: w,
+			})
+		}
+		t.controlBuf.put(bdpPing)
+	}
+	// Select the right stream to dispatch.
+	s, ok := t.getStream(f)
+	if !ok {
+		return
+	}
+	if size > 0 {
+		if err := s.fc.onData(size); err != nil {
+			t.closeStream(s, true, http2.ErrCodeFlowControl, false)
+			return
+		}
+		if f.Header().Flags.Has(http2.FlagDataPadded) {
+			if w := s.fc.onRead(size - uint32(len(f.Data()))); w > 0 {
+				t.controlBuf.put(&outgoingWindowUpdate{s.id, w})
+			}
+		}
+		// TODO(bradfitz, zhaoq): A copy is required here because there is no
+		// guarantee f.Data() is consumed before the arrival of next frame.
+		// Can this copy be eliminated?
+		if len(f.Data()) > 0 {
+			buffer := t.bufferPool.get()
+			buffer.Reset()
+			buffer.Write(f.Data())
+			s.write(recvMsg{buffer: buffer})
+		}
+	}
+	if f.Header().Flags.Has(http2.FlagDataEndStream) {
+		// Received the end of stream from the client.
+		s.compareAndSwapState(streamActive, streamReadDone)
+		s.write(recvMsg{err: io.EOF})
+	}
+}
+
+func (t *http2Server) handleRSTStream(f *http2.RSTStreamFrame) {
+	// If the stream is not deleted from the transport's active streams map, then do a regular close stream.
+	if s, ok := t.getStream(f); ok {
+		t.closeStream(s, false, 0, false)
+		return
+	}
+	// If the stream is already deleted from the active streams map, then put a cleanupStream item into controlbuf to delete the stream from loopy writer's established streams map.
+	t.controlBuf.put(&cleanupStream{
+		streamID: f.Header().StreamID,
+		rst:      false,
+		rstCode:  0,
+		onWrite:  func() {},
+	})
+}
+
+func (t *http2Server) handleSettings(f *http2.SettingsFrame) {
+	if f.IsAck() {
+		return
+	}
+	var ss []http2.Setting
+	var updateFuncs []func()
+	f.ForeachSetting(func(s http2.Setting) error {
+		switch s.ID {
+		case http2.SettingMaxHeaderListSize:
+			updateFuncs = append(updateFuncs, func() {
+				t.maxSendHeaderListSize = new(uint32)
+				*t.maxSendHeaderListSize = s.Val
+			})
+		default:
+			ss = append(ss, s)
+		}
+		return nil
+	})
+	t.controlBuf.executeAndPut(func(interface{}) bool {
+		for _, f := range updateFuncs {
+			f()
+		}
+		return true
+	}, &incomingSettings{
+		ss: ss,
+	})
+}
+
+const (
+	maxPingStrikes     = 2
+	defaultPingTimeout = 2 * time.Hour
+)
+
+func (t *http2Server) handlePing(f *http2.PingFrame) {
+	if f.IsAck() {
+		if f.Data == goAwayPing.data && t.drainChan != nil {
+			close(t.drainChan)
+			return
+		}
+		// Maybe it's a BDP ping.
+		if t.bdpEst != nil {
+			t.bdpEst.calculate(f.Data)
+		}
+		return
+	}
+	pingAck := &ping{ack: true}
+	copy(pingAck.data[:], f.Data[:])
+	t.controlBuf.put(pingAck)
+
+	now := time.Now()
+	defer func() {
+		t.lastPingAt = now
+	}()
+	// A reset ping strikes means that we don't need to check for policy
+	// violation for this ping and the pingStrikes counter should be set
+	// to 0.
+	if atomic.CompareAndSwapUint32(&t.resetPingStrikes, 1, 0) {
+		t.pingStrikes = 0
+		return
+	}
+	t.mu.Lock()
+	ns := len(t.activeStreams)
+	t.mu.Unlock()
+	if ns < 1 && !t.kep.PermitWithoutStream {
+		// Keepalive shouldn't be active thus, this new ping should
+		// have come after at least defaultPingTimeout.
+		if t.lastPingAt.Add(defaultPingTimeout).After(now) {
+			t.pingStrikes++
+		}
+	} else {
+		// Check if keepalive policy is respected.
+		if t.lastPingAt.Add(t.kep.MinTime).After(now) {
+			t.pingStrikes++
+		}
+	}
+
+	if t.pingStrikes > maxPingStrikes {
+		// Send goaway and close the connection.
+		errorf("transport: Got too many pings from the client, closing the connection.")
+		t.controlBuf.put(&goAway{code: http2.ErrCodeEnhanceYourCalm, debugData: []byte("too_many_pings"), closeConn: true})
+	}
+}
+
+func (t *http2Server) handleWindowUpdate(f *http2.WindowUpdateFrame) {
+	t.controlBuf.put(&incomingWindowUpdate{
+		streamID:  f.Header().StreamID,
+		increment: f.Increment,
+	})
+}
+
+func appendHeaderFieldsFromMD(headerFields []hpack.HeaderField, md metadata.MD) []hpack.HeaderField {
+	for k, vv := range md {
+		if isReservedHeader(k) {
+			// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
+			continue
+		}
+		for _, v := range vv {
+			headerFields = append(headerFields, hpack.HeaderField{Name: k, Value: encodeMetadataHeader(k, v)})
+		}
+	}
+	return headerFields
+}
+
+func (t *http2Server) checkForHeaderListSize(it interface{}) bool {
+	if t.maxSendHeaderListSize == nil {
+		return true
+	}
+	hdrFrame := it.(*headerFrame)
+	var sz int64
+	for _, f := range hdrFrame.hf {
+		if sz += int64(f.Size()); sz > int64(*t.maxSendHeaderListSize) {
+			errorf("header list size to send violates the maximum size (%d bytes) set by client", *t.maxSendHeaderListSize)
+			return false
+		}
+	}
+	return true
+}
+
+// WriteHeader sends the header metadata md back to the client.
+func (t *http2Server) WriteHeader(s *Stream, md metadata.MD) error {
+	if s.updateHeaderSent() || s.getState() == streamDone {
+		return ErrIllegalHeaderWrite
+	}
+	s.hdrMu.Lock()
+	if md.Len() > 0 {
+		if s.header.Len() > 0 {
+			s.header = metadata.Join(s.header, md)
+		} else {
+			s.header = md
+		}
+	}
+	if err := t.writeHeaderLocked(s); err != nil {
+		s.hdrMu.Unlock()
+		return err
+	}
+	s.hdrMu.Unlock()
+	return nil
+}
+
+func (t *http2Server) setResetPingStrikes() {
+	atomic.StoreUint32(&t.resetPingStrikes, 1)
+}
+
+func (t *http2Server) writeHeaderLocked(s *Stream) error {
+	// TODO(mmukhi): Benchmark if the performance gets better if count the metadata and other header fields
+	// first and create a slice of that exact size.
+	headerFields := make([]hpack.HeaderField, 0, 2) // at least :status, content-type will be there if none else.
+	headerFields = append(headerFields, hpack.HeaderField{Name: ":status", Value: "200"})
+	headerFields = append(headerFields, hpack.HeaderField{Name: "content-type", Value: contentType(s.contentSubtype)})
+	if s.sendCompress != "" {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-encoding", Value: s.sendCompress})
+	}
+	headerFields = appendHeaderFieldsFromMD(headerFields, s.header)
+	success, err := t.controlBuf.executeAndPut(t.checkForHeaderListSize, &headerFrame{
+		streamID:  s.id,
+		hf:        headerFields,
+		endStream: false,
+		onWrite:   t.setResetPingStrikes,
+	})
+	if !success {
+		if err != nil {
+			return err
+		}
+		t.closeStream(s, true, http2.ErrCodeInternal, false)
+		return ErrHeaderListSizeLimitViolation
+	}
+	if t.stats != nil {
+		// Note: WireLength is not set in outHeader.
+		// TODO(mmukhi): Revisit this later, if needed.
+		outHeader := &stats.OutHeader{
+			Header: s.header.Copy(),
+		}
+		t.stats.HandleRPC(s.Context(), outHeader)
+	}
+	return nil
+}
+
+// WriteStatus sends stream status to the client and terminates the stream.
+// There is no further I/O operations being able to perform on this stream.
+// TODO(zhaoq): Now it indicates the end of entire stream. Revisit if early
+// OK is adopted.
+func (t *http2Server) WriteStatus(s *Stream, st *status.Status) error {
+	if s.getState() == streamDone {
+		return nil
+	}
+	s.hdrMu.Lock()
+	// TODO(mmukhi): Benchmark if the performance gets better if count the metadata and other header fields
+	// first and create a slice of that exact size.
+	headerFields := make([]hpack.HeaderField, 0, 2) // grpc-status and grpc-message will be there if none else.
+	if !s.updateHeaderSent() {                      // No headers have been sent.
+		if len(s.header) > 0 { // Send a separate header frame.
+			if err := t.writeHeaderLocked(s); err != nil {
+				s.hdrMu.Unlock()
+				return err
+			}
+		} else { // Send a trailer only response.
+			headerFields = append(headerFields, hpack.HeaderField{Name: ":status", Value: "200"})
+			headerFields = append(headerFields, hpack.HeaderField{Name: "content-type", Value: contentType(s.contentSubtype)})
+		}
+	}
+	headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-status", Value: strconv.Itoa(int(st.Code()))})
+	headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-message", Value: encodeGrpcMessage(st.Message())})
+
+	if p := statusRawProto(st); p != nil && len(p.Details) > 0 {
+		stBytes, err := proto.Marshal(p)
+		if err != nil {
+			// TODO: return error instead, when callers are able to handle it.
+			grpclog.Errorf("transport: failed to marshal rpc status: %v, error: %v", p, err)
+		} else {
+			headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-status-details-bin", Value: encodeBinHeader(stBytes)})
+		}
+	}
+
+	// Attach the trailer metadata.
+	headerFields = appendHeaderFieldsFromMD(headerFields, s.trailer)
+	trailingHeader := &headerFrame{
+		streamID:  s.id,
+		hf:        headerFields,
+		endStream: true,
+		onWrite:   t.setResetPingStrikes,
+	}
+	s.hdrMu.Unlock()
+	success, err := t.controlBuf.execute(t.checkForHeaderListSize, trailingHeader)
+	if !success {
+		if err != nil {
+			return err
+		}
+		t.closeStream(s, true, http2.ErrCodeInternal, false)
+		return ErrHeaderListSizeLimitViolation
+	}
+	// Send a RST_STREAM after the trailers if the client has not already half-closed.
+	rst := s.getState() == streamActive
+	t.finishStream(s, rst, http2.ErrCodeNo, trailingHeader, true)
+	if t.stats != nil {
+		t.stats.HandleRPC(s.Context(), &stats.OutTrailer{
+			Trailer: s.trailer.Copy(),
+		})
+	}
+	return nil
+}
+
+// Write converts the data into HTTP2 data frame and sends it out. Non-nil error
+// is returns if it fails (e.g., framing error, transport error).
+func (t *http2Server) Write(s *Stream, hdr []byte, data []byte, opts *Options) error {
+	if !s.isHeaderSent() { // Headers haven't been written yet.
+		if err := t.WriteHeader(s, nil); err != nil {
+			if _, ok := err.(ConnectionError); ok {
+				return err
+			}
+			// TODO(mmukhi, dfawley): Make sure this is the right code to return.
+			return status.Errorf(codes.Internal, "transport: %v", err)
+		}
+	} else {
+		// Writing headers checks for this condition.
+		if s.getState() == streamDone {
+			// TODO(mmukhi, dfawley): Should the server write also return io.EOF?
+			s.cancel()
+			select {
+			case <-t.done:
+				return ErrConnClosing
+			default:
+			}
+			return ContextErr(s.ctx.Err())
+		}
+	}
+	// Add some data to header frame so that we can equally distribute bytes across frames.
+	emptyLen := http2MaxFrameLen - len(hdr)
+	if emptyLen > len(data) {
+		emptyLen = len(data)
+	}
+	hdr = append(hdr, data[:emptyLen]...)
+	data = data[emptyLen:]
+	df := &dataFrame{
+		streamID:    s.id,
+		h:           hdr,
+		d:           data,
+		onEachWrite: t.setResetPingStrikes,
+	}
+	if err := s.wq.get(int32(len(hdr) + len(data))); err != nil {
+		select {
+		case <-t.done:
+			return ErrConnClosing
+		default:
+		}
+		return ContextErr(s.ctx.Err())
+	}
+	return t.controlBuf.put(df)
+}
+
+// keepalive running in a separate goroutine does the following:
+// 1. Gracefully closes an idle connection after a duration of keepalive.MaxConnectionIdle.
+// 2. Gracefully closes any connection after a duration of keepalive.MaxConnectionAge.
+// 3. Forcibly closes a connection after an additive period of keepalive.MaxConnectionAgeGrace over keepalive.MaxConnectionAge.
+// 4. Makes sure a connection is alive by sending pings with a frequency of keepalive.Time and closes a non-responsive connection
+// after an additional duration of keepalive.Timeout.
+func (t *http2Server) keepalive() {
+	p := &ping{}
+	// True iff a ping has been sent, and no data has been received since then.
+	outstandingPing := false
+	// Amount of time remaining before which we should receive an ACK for the
+	// last sent ping.
+	kpTimeoutLeft := time.Duration(0)
+	// Records the last value of t.lastRead before we go block on the timer.
+	// This is required to check for read activity since then.
+	prevNano := time.Now().UnixNano()
+	// Initialize the different timers to their default values.
+	idleTimer := time.NewTimer(t.kp.MaxConnectionIdle)
+	ageTimer := time.NewTimer(t.kp.MaxConnectionAge)
+	kpTimer := time.NewTimer(t.kp.Time)
+	defer func() {
+		// We need to drain the underlying channel in these timers after a call
+		// to Stop(), only if we are interested in resetting them. Clearly we
+		// are not interested in resetting them here.
+		idleTimer.Stop()
+		ageTimer.Stop()
+		kpTimer.Stop()
+	}()
+
+	for {
+		select {
+		case <-idleTimer.C:
+			t.mu.Lock()
+			idle := t.idle
+			if idle.IsZero() { // The connection is non-idle.
+				t.mu.Unlock()
+				idleTimer.Reset(t.kp.MaxConnectionIdle)
+				continue
+			}
+			val := t.kp.MaxConnectionIdle - time.Since(idle)
+			t.mu.Unlock()
+			if val <= 0 {
+				// The connection has been idle for a duration of keepalive.MaxConnectionIdle or more.
+				// Gracefully close the connection.
+				t.drain(http2.ErrCodeNo, []byte{})
+				return
+			}
+			idleTimer.Reset(val)
+		case <-ageTimer.C:
+			t.drain(http2.ErrCodeNo, []byte{})
+			ageTimer.Reset(t.kp.MaxConnectionAgeGrace)
+			select {
+			case <-ageTimer.C:
+				// Close the connection after grace period.
+				infof("transport: closing server transport due to maximum connection age.")
+				t.Close()
+			case <-t.done:
+			}
+			return
+		case <-kpTimer.C:
+			lastRead := atomic.LoadInt64(&t.lastRead)
+			if lastRead > prevNano {
+				// There has been read activity since the last time we were
+				// here. Setup the timer to fire at kp.Time seconds from
+				// lastRead time and continue.
+				outstandingPing = false
+				kpTimer.Reset(time.Duration(lastRead) + t.kp.Time - time.Duration(time.Now().UnixNano()))
+				prevNano = lastRead
+				continue
+			}
+			if outstandingPing && kpTimeoutLeft <= 0 {
+				infof("transport: closing server transport due to idleness.")
+				t.Close()
+				return
+			}
+			if !outstandingPing {
+				if channelz.IsOn() {
+					atomic.AddInt64(&t.czData.kpCount, 1)
+				}
+				t.controlBuf.put(p)
+				kpTimeoutLeft = t.kp.Timeout
+				outstandingPing = true
+			}
+			// The amount of time to sleep here is the minimum of kp.Time and
+			// timeoutLeft. This will ensure that we wait only for kp.Time
+			// before sending out the next ping (for cases where the ping is
+			// acked).
+			sleepDuration := minTime(t.kp.Time, kpTimeoutLeft)
+			kpTimeoutLeft -= sleepDuration
+			kpTimer.Reset(sleepDuration)
+		case <-t.done:
+			return
+		}
+	}
+}
+
+// Close starts shutting down the http2Server transport.
+// TODO(zhaoq): Now the destruction is not blocked on any pending streams. This
+// could cause some resource issue. Revisit this later.
+func (t *http2Server) Close() error {
+	t.mu.Lock()
+	if t.state == closing {
+		t.mu.Unlock()
+		return errors.New("transport: Close() was already called")
+	}
+	t.state = closing
+	streams := t.activeStreams
+	t.activeStreams = nil
+	t.mu.Unlock()
+	t.controlBuf.finish()
+	close(t.done)
+	err := t.conn.Close()
+	if channelz.IsOn() {
+		channelz.RemoveEntry(t.channelzID)
+	}
+	// Cancel all active streams.
+	for _, s := range streams {
+		s.cancel()
+	}
+	if t.stats != nil {
+		connEnd := &stats.ConnEnd{}
+		t.stats.HandleConn(t.ctx, connEnd)
+	}
+	return err
+}
+
+// deleteStream deletes the stream s from transport's active streams.
+func (t *http2Server) deleteStream(s *Stream, eosReceived bool) {
+	// In case stream sending and receiving are invoked in separate
+	// goroutines (e.g., bi-directional streaming), cancel needs to be
+	// called to interrupt the potential blocking on other goroutines.
+	s.cancel()
+
+	t.mu.Lock()
+	if _, ok := t.activeStreams[s.id]; ok {
+		delete(t.activeStreams, s.id)
+		if len(t.activeStreams) == 0 {
+			t.idle = time.Now()
+		}
+	}
+	t.mu.Unlock()
+
+	if channelz.IsOn() {
+		if eosReceived {
+			atomic.AddInt64(&t.czData.streamsSucceeded, 1)
+		} else {
+			atomic.AddInt64(&t.czData.streamsFailed, 1)
+		}
+	}
+}
+
+// finishStream closes the stream and puts the trailing headerFrame into controlbuf.
+func (t *http2Server) finishStream(s *Stream, rst bool, rstCode http2.ErrCode, hdr *headerFrame, eosReceived bool) {
+	oldState := s.swapState(streamDone)
+	if oldState == streamDone {
+		// If the stream was already done, return.
+		return
+	}
+
+	hdr.cleanup = &cleanupStream{
+		streamID: s.id,
+		rst:      rst,
+		rstCode:  rstCode,
+		onWrite: func() {
+			t.deleteStream(s, eosReceived)
+		},
+	}
+	t.controlBuf.put(hdr)
+}
+
+// closeStream clears the footprint of a stream when the stream is not needed any more.
+func (t *http2Server) closeStream(s *Stream, rst bool, rstCode http2.ErrCode, eosReceived bool) {
+	s.swapState(streamDone)
+	t.deleteStream(s, eosReceived)
+
+	t.controlBuf.put(&cleanupStream{
+		streamID: s.id,
+		rst:      rst,
+		rstCode:  rstCode,
+		onWrite:  func() {},
+	})
+}
+
+func (t *http2Server) RemoteAddr() net.Addr {
+	return t.remoteAddr
+}
+
+func (t *http2Server) Drain() {
+	t.drain(http2.ErrCodeNo, []byte{})
+}
+
+func (t *http2Server) drain(code http2.ErrCode, debugData []byte) {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if t.drainChan != nil {
+		return
+	}
+	t.drainChan = make(chan struct{})
+	t.controlBuf.put(&goAway{code: code, debugData: debugData, headsUp: true})
+}
+
+var goAwayPing = &ping{data: [8]byte{1, 6, 1, 8, 0, 3, 3, 9}}
+
+// Handles outgoing GoAway and returns true if loopy needs to put itself
+// in draining mode.
+func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
+	t.mu.Lock()
+	if t.state == closing { // TODO(mmukhi): This seems unnecessary.
+		t.mu.Unlock()
+		// The transport is closing.
+		return false, ErrConnClosing
+	}
+	sid := t.maxStreamID
+	if !g.headsUp {
+		// Stop accepting more streams now.
+		t.state = draining
+		if len(t.activeStreams) == 0 {
+			g.closeConn = true
+		}
+		t.mu.Unlock()
+		if err := t.framer.fr.WriteGoAway(sid, g.code, g.debugData); err != nil {
+			return false, err
+		}
+		if g.closeConn {
+			// Abruptly close the connection following the GoAway (via
+			// loopywriter).  But flush out what's inside the buffer first.
+			t.framer.writer.Flush()
+			return false, fmt.Errorf("transport: Connection closing")
+		}
+		return true, nil
+	}
+	t.mu.Unlock()
+	// For a graceful close, send out a GoAway with stream ID of MaxUInt32,
+	// Follow that with a ping and wait for the ack to come back or a timer
+	// to expire. During this time accept new streams since they might have
+	// originated before the GoAway reaches the client.
+	// After getting the ack or timer expiration send out another GoAway this
+	// time with an ID of the max stream server intends to process.
+	if err := t.framer.fr.WriteGoAway(math.MaxUint32, http2.ErrCodeNo, []byte{}); err != nil {
+		return false, err
+	}
+	if err := t.framer.fr.WritePing(false, goAwayPing.data); err != nil {
+		return false, err
+	}
+	go func() {
+		timer := time.NewTimer(time.Minute)
+		defer timer.Stop()
+		select {
+		case <-t.drainChan:
+		case <-timer.C:
+		case <-t.done:
+			return
+		}
+		t.controlBuf.put(&goAway{code: g.code, debugData: g.debugData})
+	}()
+	return false, nil
+}
+
+func (t *http2Server) ChannelzMetric() *channelz.SocketInternalMetric {
+	s := channelz.SocketInternalMetric{
+		StreamsStarted:                   atomic.LoadInt64(&t.czData.streamsStarted),
+		StreamsSucceeded:                 atomic.LoadInt64(&t.czData.streamsSucceeded),
+		StreamsFailed:                    atomic.LoadInt64(&t.czData.streamsFailed),
+		MessagesSent:                     atomic.LoadInt64(&t.czData.msgSent),
+		MessagesReceived:                 atomic.LoadInt64(&t.czData.msgRecv),
+		KeepAlivesSent:                   atomic.LoadInt64(&t.czData.kpCount),
+		LastRemoteStreamCreatedTimestamp: time.Unix(0, atomic.LoadInt64(&t.czData.lastStreamCreatedTime)),
+		LastMessageSentTimestamp:         time.Unix(0, atomic.LoadInt64(&t.czData.lastMsgSentTime)),
+		LastMessageReceivedTimestamp:     time.Unix(0, atomic.LoadInt64(&t.czData.lastMsgRecvTime)),
+		LocalFlowControlWindow:           int64(t.fc.getSize()),
+		SocketOptions:                    channelz.GetSocketOption(t.conn),
+		LocalAddr:                        t.localAddr,
+		RemoteAddr:                       t.remoteAddr,
+		// RemoteName :
+	}
+	if au, ok := t.authInfo.(credentials.ChannelzSecurityInfo); ok {
+		s.Security = au.GetSecurityValue()
+	}
+	s.RemoteFlowControlWindow = t.getOutFlowWindow()
+	return &s
+}
+
+func (t *http2Server) IncrMsgSent() {
+	atomic.AddInt64(&t.czData.msgSent, 1)
+	atomic.StoreInt64(&t.czData.lastMsgSentTime, time.Now().UnixNano())
+}
+
+func (t *http2Server) IncrMsgRecv() {
+	atomic.AddInt64(&t.czData.msgRecv, 1)
+	atomic.StoreInt64(&t.czData.lastMsgRecvTime, time.Now().UnixNano())
+}
+
+func (t *http2Server) getOutFlowWindow() int64 {
+	resp := make(chan uint32, 1)
+	timer := time.NewTimer(time.Second)
+	defer timer.Stop()
+	t.controlBuf.put(&outFlowControlSizeRequest{resp})
+	select {
+	case sz := <-resp:
+		return int64(sz)
+	case <-t.done:
+		return -1
+	case <-timer.C:
+		return -2
+	}
+}
+
+func getJitter(v time.Duration) time.Duration {
+	if v == infinity {
+		return 0
+	}
+	// Generate a jitter between +/- 10% of the value.
+	r := int64(v / 10)
+	j := grpcrand.Int63n(2*r) - r
+	return time.Duration(j)
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/http_util.go b/vendor/google.golang.org/grpc/internal/transport/http_util.go
new file mode 100644
index 0000000..8f5f334
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/http_util.go
@@ -0,0 +1,677 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"github.com/golang/protobuf/proto"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/hpack"
+	spb "google.golang.org/genproto/googleapis/rpc/status"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+const (
+	// http2MaxFrameLen specifies the max length of a HTTP2 frame.
+	http2MaxFrameLen = 16384 // 16KB frame
+	// http://http2.github.io/http2-spec/#SettingValues
+	http2InitHeaderTableSize = 4096
+	// baseContentType is the base content-type for gRPC.  This is a valid
+	// content-type on it's own, but can also include a content-subtype such as
+	// "proto" as a suffix after "+" or ";".  See
+	// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests
+	// for more details.
+	baseContentType = "application/grpc"
+)
+
+var (
+	clientPreface   = []byte(http2.ClientPreface)
+	http2ErrConvTab = map[http2.ErrCode]codes.Code{
+		http2.ErrCodeNo:                 codes.Internal,
+		http2.ErrCodeProtocol:           codes.Internal,
+		http2.ErrCodeInternal:           codes.Internal,
+		http2.ErrCodeFlowControl:        codes.ResourceExhausted,
+		http2.ErrCodeSettingsTimeout:    codes.Internal,
+		http2.ErrCodeStreamClosed:       codes.Internal,
+		http2.ErrCodeFrameSize:          codes.Internal,
+		http2.ErrCodeRefusedStream:      codes.Unavailable,
+		http2.ErrCodeCancel:             codes.Canceled,
+		http2.ErrCodeCompression:        codes.Internal,
+		http2.ErrCodeConnect:            codes.Internal,
+		http2.ErrCodeEnhanceYourCalm:    codes.ResourceExhausted,
+		http2.ErrCodeInadequateSecurity: codes.PermissionDenied,
+		http2.ErrCodeHTTP11Required:     codes.Internal,
+	}
+	statusCodeConvTab = map[codes.Code]http2.ErrCode{
+		codes.Internal:          http2.ErrCodeInternal,
+		codes.Canceled:          http2.ErrCodeCancel,
+		codes.Unavailable:       http2.ErrCodeRefusedStream,
+		codes.ResourceExhausted: http2.ErrCodeEnhanceYourCalm,
+		codes.PermissionDenied:  http2.ErrCodeInadequateSecurity,
+	}
+	// HTTPStatusConvTab is the HTTP status code to gRPC error code conversion table.
+	HTTPStatusConvTab = map[int]codes.Code{
+		// 400 Bad Request - INTERNAL.
+		http.StatusBadRequest: codes.Internal,
+		// 401 Unauthorized  - UNAUTHENTICATED.
+		http.StatusUnauthorized: codes.Unauthenticated,
+		// 403 Forbidden - PERMISSION_DENIED.
+		http.StatusForbidden: codes.PermissionDenied,
+		// 404 Not Found - UNIMPLEMENTED.
+		http.StatusNotFound: codes.Unimplemented,
+		// 429 Too Many Requests - UNAVAILABLE.
+		http.StatusTooManyRequests: codes.Unavailable,
+		// 502 Bad Gateway - UNAVAILABLE.
+		http.StatusBadGateway: codes.Unavailable,
+		// 503 Service Unavailable - UNAVAILABLE.
+		http.StatusServiceUnavailable: codes.Unavailable,
+		// 504 Gateway timeout - UNAVAILABLE.
+		http.StatusGatewayTimeout: codes.Unavailable,
+	}
+)
+
+type parsedHeaderData struct {
+	encoding string
+	// statusGen caches the stream status received from the trailer the server
+	// sent.  Client side only.  Do not access directly.  After all trailers are
+	// parsed, use the status method to retrieve the status.
+	statusGen *status.Status
+	// rawStatusCode and rawStatusMsg are set from the raw trailer fields and are not
+	// intended for direct access outside of parsing.
+	rawStatusCode *int
+	rawStatusMsg  string
+	httpStatus    *int
+	// Server side only fields.
+	timeoutSet bool
+	timeout    time.Duration
+	method     string
+	// key-value metadata map from the peer.
+	mdata          map[string][]string
+	statsTags      []byte
+	statsTrace     []byte
+	contentSubtype string
+
+	// isGRPC field indicates whether the peer is speaking gRPC (otherwise HTTP).
+	//
+	// We are in gRPC mode (peer speaking gRPC) if:
+	// 	* We are client side and have already received a HEADER frame that indicates gRPC peer.
+	//  * The header contains valid  a content-type, i.e. a string starts with "application/grpc"
+	// And we should handle error specific to gRPC.
+	//
+	// Otherwise (i.e. a content-type string starts without "application/grpc", or does not exist), we
+	// are in HTTP fallback mode, and should handle error specific to HTTP.
+	isGRPC         bool
+	grpcErr        error
+	httpErr        error
+	contentTypeErr string
+}
+
+// decodeState configures decoding criteria and records the decoded data.
+type decodeState struct {
+	// whether decoding on server side or not
+	serverSide bool
+
+	// Records the states during HPACK decoding. It will be filled with info parsed from HTTP HEADERS
+	// frame once decodeHeader function has been invoked and returned.
+	data parsedHeaderData
+}
+
+// isReservedHeader checks whether hdr belongs to HTTP2 headers
+// reserved by gRPC protocol. Any other headers are classified as the
+// user-specified metadata.
+func isReservedHeader(hdr string) bool {
+	if hdr != "" && hdr[0] == ':' {
+		return true
+	}
+	switch hdr {
+	case "content-type",
+		"user-agent",
+		"grpc-message-type",
+		"grpc-encoding",
+		"grpc-message",
+		"grpc-status",
+		"grpc-timeout",
+		"grpc-status-details-bin",
+		// Intentionally exclude grpc-previous-rpc-attempts and
+		// grpc-retry-pushback-ms, which are "reserved", but their API
+		// intentionally works via metadata.
+		"te":
+		return true
+	default:
+		return false
+	}
+}
+
+// isWhitelistedHeader checks whether hdr should be propagated into metadata
+// visible to users, even though it is classified as "reserved", above.
+func isWhitelistedHeader(hdr string) bool {
+	switch hdr {
+	case ":authority", "user-agent":
+		return true
+	default:
+		return false
+	}
+}
+
+// contentSubtype returns the content-subtype for the given content-type.  The
+// given content-type must be a valid content-type that starts with
+// "application/grpc". A content-subtype will follow "application/grpc" after a
+// "+" or ";". See
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details.
+//
+// If contentType is not a valid content-type for gRPC, the boolean
+// will be false, otherwise true. If content-type == "application/grpc",
+// "application/grpc+", or "application/grpc;", the boolean will be true,
+// but no content-subtype will be returned.
+//
+// contentType is assumed to be lowercase already.
+func contentSubtype(contentType string) (string, bool) {
+	if contentType == baseContentType {
+		return "", true
+	}
+	if !strings.HasPrefix(contentType, baseContentType) {
+		return "", false
+	}
+	// guaranteed since != baseContentType and has baseContentType prefix
+	switch contentType[len(baseContentType)] {
+	case '+', ';':
+		// this will return true for "application/grpc+" or "application/grpc;"
+		// which the previous validContentType function tested to be valid, so we
+		// just say that no content-subtype is specified in this case
+		return contentType[len(baseContentType)+1:], true
+	default:
+		return "", false
+	}
+}
+
+// contentSubtype is assumed to be lowercase
+func contentType(contentSubtype string) string {
+	if contentSubtype == "" {
+		return baseContentType
+	}
+	return baseContentType + "+" + contentSubtype
+}
+
+func (d *decodeState) status() *status.Status {
+	if d.data.statusGen == nil {
+		// No status-details were provided; generate status using code/msg.
+		d.data.statusGen = status.New(codes.Code(int32(*(d.data.rawStatusCode))), d.data.rawStatusMsg)
+	}
+	return d.data.statusGen
+}
+
+const binHdrSuffix = "-bin"
+
+func encodeBinHeader(v []byte) string {
+	return base64.RawStdEncoding.EncodeToString(v)
+}
+
+func decodeBinHeader(v string) ([]byte, error) {
+	if len(v)%4 == 0 {
+		// Input was padded, or padding was not necessary.
+		return base64.StdEncoding.DecodeString(v)
+	}
+	return base64.RawStdEncoding.DecodeString(v)
+}
+
+func encodeMetadataHeader(k, v string) string {
+	if strings.HasSuffix(k, binHdrSuffix) {
+		return encodeBinHeader(([]byte)(v))
+	}
+	return v
+}
+
+func decodeMetadataHeader(k, v string) (string, error) {
+	if strings.HasSuffix(k, binHdrSuffix) {
+		b, err := decodeBinHeader(v)
+		return string(b), err
+	}
+	return v, nil
+}
+
+func (d *decodeState) decodeHeader(frame *http2.MetaHeadersFrame) error {
+	// frame.Truncated is set to true when framer detects that the current header
+	// list size hits MaxHeaderListSize limit.
+	if frame.Truncated {
+		return status.Error(codes.Internal, "peer header list size exceeded limit")
+	}
+
+	for _, hf := range frame.Fields {
+		d.processHeaderField(hf)
+	}
+
+	if d.data.isGRPC {
+		if d.data.grpcErr != nil {
+			return d.data.grpcErr
+		}
+		if d.serverSide {
+			return nil
+		}
+		if d.data.rawStatusCode == nil && d.data.statusGen == nil {
+			// gRPC status doesn't exist.
+			// Set rawStatusCode to be unknown and return nil error.
+			// So that, if the stream has ended this Unknown status
+			// will be propagated to the user.
+			// Otherwise, it will be ignored. In which case, status from
+			// a later trailer, that has StreamEnded flag set, is propagated.
+			code := int(codes.Unknown)
+			d.data.rawStatusCode = &code
+		}
+		return nil
+	}
+
+	// HTTP fallback mode
+	if d.data.httpErr != nil {
+		return d.data.httpErr
+	}
+
+	var (
+		code = codes.Internal // when header does not include HTTP status, return INTERNAL
+		ok   bool
+	)
+
+	if d.data.httpStatus != nil {
+		code, ok = HTTPStatusConvTab[*(d.data.httpStatus)]
+		if !ok {
+			code = codes.Unknown
+		}
+	}
+
+	return status.Error(code, d.constructHTTPErrMsg())
+}
+
+// constructErrMsg constructs error message to be returned in HTTP fallback mode.
+// Format: HTTP status code and its corresponding message + content-type error message.
+func (d *decodeState) constructHTTPErrMsg() string {
+	var errMsgs []string
+
+	if d.data.httpStatus == nil {
+		errMsgs = append(errMsgs, "malformed header: missing HTTP status")
+	} else {
+		errMsgs = append(errMsgs, fmt.Sprintf("%s: HTTP status code %d", http.StatusText(*(d.data.httpStatus)), *d.data.httpStatus))
+	}
+
+	if d.data.contentTypeErr == "" {
+		errMsgs = append(errMsgs, "transport: missing content-type field")
+	} else {
+		errMsgs = append(errMsgs, d.data.contentTypeErr)
+	}
+
+	return strings.Join(errMsgs, "; ")
+}
+
+func (d *decodeState) addMetadata(k, v string) {
+	if d.data.mdata == nil {
+		d.data.mdata = make(map[string][]string)
+	}
+	d.data.mdata[k] = append(d.data.mdata[k], v)
+}
+
+func (d *decodeState) processHeaderField(f hpack.HeaderField) {
+	switch f.Name {
+	case "content-type":
+		contentSubtype, validContentType := contentSubtype(f.Value)
+		if !validContentType {
+			d.data.contentTypeErr = fmt.Sprintf("transport: received the unexpected content-type %q", f.Value)
+			return
+		}
+		d.data.contentSubtype = contentSubtype
+		// TODO: do we want to propagate the whole content-type in the metadata,
+		// or come up with a way to just propagate the content-subtype if it was set?
+		// ie {"content-type": "application/grpc+proto"} or {"content-subtype": "proto"}
+		// in the metadata?
+		d.addMetadata(f.Name, f.Value)
+		d.data.isGRPC = true
+	case "grpc-encoding":
+		d.data.encoding = f.Value
+	case "grpc-status":
+		code, err := strconv.Atoi(f.Value)
+		if err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed grpc-status: %v", err)
+			return
+		}
+		d.data.rawStatusCode = &code
+	case "grpc-message":
+		d.data.rawStatusMsg = decodeGrpcMessage(f.Value)
+	case "grpc-status-details-bin":
+		v, err := decodeBinHeader(f.Value)
+		if err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed grpc-status-details-bin: %v", err)
+			return
+		}
+		s := &spb.Status{}
+		if err := proto.Unmarshal(v, s); err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed grpc-status-details-bin: %v", err)
+			return
+		}
+		d.data.statusGen = status.FromProto(s)
+	case "grpc-timeout":
+		d.data.timeoutSet = true
+		var err error
+		if d.data.timeout, err = decodeTimeout(f.Value); err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed time-out: %v", err)
+		}
+	case ":path":
+		d.data.method = f.Value
+	case ":status":
+		code, err := strconv.Atoi(f.Value)
+		if err != nil {
+			d.data.httpErr = status.Errorf(codes.Internal, "transport: malformed http-status: %v", err)
+			return
+		}
+		d.data.httpStatus = &code
+	case "grpc-tags-bin":
+		v, err := decodeBinHeader(f.Value)
+		if err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed grpc-tags-bin: %v", err)
+			return
+		}
+		d.data.statsTags = v
+		d.addMetadata(f.Name, string(v))
+	case "grpc-trace-bin":
+		v, err := decodeBinHeader(f.Value)
+		if err != nil {
+			d.data.grpcErr = status.Errorf(codes.Internal, "transport: malformed grpc-trace-bin: %v", err)
+			return
+		}
+		d.data.statsTrace = v
+		d.addMetadata(f.Name, string(v))
+	default:
+		if isReservedHeader(f.Name) && !isWhitelistedHeader(f.Name) {
+			break
+		}
+		v, err := decodeMetadataHeader(f.Name, f.Value)
+		if err != nil {
+			errorf("Failed to decode metadata header (%q, %q): %v", f.Name, f.Value, err)
+			return
+		}
+		d.addMetadata(f.Name, v)
+	}
+}
+
+type timeoutUnit uint8
+
+const (
+	hour        timeoutUnit = 'H'
+	minute      timeoutUnit = 'M'
+	second      timeoutUnit = 'S'
+	millisecond timeoutUnit = 'm'
+	microsecond timeoutUnit = 'u'
+	nanosecond  timeoutUnit = 'n'
+)
+
+func timeoutUnitToDuration(u timeoutUnit) (d time.Duration, ok bool) {
+	switch u {
+	case hour:
+		return time.Hour, true
+	case minute:
+		return time.Minute, true
+	case second:
+		return time.Second, true
+	case millisecond:
+		return time.Millisecond, true
+	case microsecond:
+		return time.Microsecond, true
+	case nanosecond:
+		return time.Nanosecond, true
+	default:
+	}
+	return
+}
+
+const maxTimeoutValue int64 = 100000000 - 1
+
+// div does integer division and round-up the result. Note that this is
+// equivalent to (d+r-1)/r but has less chance to overflow.
+func div(d, r time.Duration) int64 {
+	if m := d % r; m > 0 {
+		return int64(d/r + 1)
+	}
+	return int64(d / r)
+}
+
+// TODO(zhaoq): It is the simplistic and not bandwidth efficient. Improve it.
+func encodeTimeout(t time.Duration) string {
+	if t <= 0 {
+		return "0n"
+	}
+	if d := div(t, time.Nanosecond); d <= maxTimeoutValue {
+		return strconv.FormatInt(d, 10) + "n"
+	}
+	if d := div(t, time.Microsecond); d <= maxTimeoutValue {
+		return strconv.FormatInt(d, 10) + "u"
+	}
+	if d := div(t, time.Millisecond); d <= maxTimeoutValue {
+		return strconv.FormatInt(d, 10) + "m"
+	}
+	if d := div(t, time.Second); d <= maxTimeoutValue {
+		return strconv.FormatInt(d, 10) + "S"
+	}
+	if d := div(t, time.Minute); d <= maxTimeoutValue {
+		return strconv.FormatInt(d, 10) + "M"
+	}
+	// Note that maxTimeoutValue * time.Hour > MaxInt64.
+	return strconv.FormatInt(div(t, time.Hour), 10) + "H"
+}
+
+func decodeTimeout(s string) (time.Duration, error) {
+	size := len(s)
+	if size < 2 {
+		return 0, fmt.Errorf("transport: timeout string is too short: %q", s)
+	}
+	if size > 9 {
+		// Spec allows for 8 digits plus the unit.
+		return 0, fmt.Errorf("transport: timeout string is too long: %q", s)
+	}
+	unit := timeoutUnit(s[size-1])
+	d, ok := timeoutUnitToDuration(unit)
+	if !ok {
+		return 0, fmt.Errorf("transport: timeout unit is not recognized: %q", s)
+	}
+	t, err := strconv.ParseInt(s[:size-1], 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	const maxHours = math.MaxInt64 / int64(time.Hour)
+	if d == time.Hour && t > maxHours {
+		// This timeout would overflow math.MaxInt64; clamp it.
+		return time.Duration(math.MaxInt64), nil
+	}
+	return d * time.Duration(t), nil
+}
+
+const (
+	spaceByte   = ' '
+	tildeByte   = '~'
+	percentByte = '%'
+)
+
+// encodeGrpcMessage is used to encode status code in header field
+// "grpc-message". It does percent encoding and also replaces invalid utf-8
+// characters with Unicode replacement character.
+//
+// It checks to see if each individual byte in msg is an allowable byte, and
+// then either percent encoding or passing it through. When percent encoding,
+// the byte is converted into hexadecimal notation with a '%' prepended.
+func encodeGrpcMessage(msg string) string {
+	if msg == "" {
+		return ""
+	}
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		c := msg[i]
+		if !(c >= spaceByte && c <= tildeByte && c != percentByte) {
+			return encodeGrpcMessageUnchecked(msg)
+		}
+	}
+	return msg
+}
+
+func encodeGrpcMessageUnchecked(msg string) string {
+	var buf bytes.Buffer
+	for len(msg) > 0 {
+		r, size := utf8.DecodeRuneInString(msg)
+		for _, b := range []byte(string(r)) {
+			if size > 1 {
+				// If size > 1, r is not ascii. Always do percent encoding.
+				buf.WriteString(fmt.Sprintf("%%%02X", b))
+				continue
+			}
+
+			// The for loop is necessary even if size == 1. r could be
+			// utf8.RuneError.
+			//
+			// fmt.Sprintf("%%%02X", utf8.RuneError) gives "%FFFD".
+			if b >= spaceByte && b <= tildeByte && b != percentByte {
+				buf.WriteByte(b)
+			} else {
+				buf.WriteString(fmt.Sprintf("%%%02X", b))
+			}
+		}
+		msg = msg[size:]
+	}
+	return buf.String()
+}
+
+// decodeGrpcMessage decodes the msg encoded by encodeGrpcMessage.
+func decodeGrpcMessage(msg string) string {
+	if msg == "" {
+		return ""
+	}
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		if msg[i] == percentByte && i+2 < lenMsg {
+			return decodeGrpcMessageUnchecked(msg)
+		}
+	}
+	return msg
+}
+
+func decodeGrpcMessageUnchecked(msg string) string {
+	var buf bytes.Buffer
+	lenMsg := len(msg)
+	for i := 0; i < lenMsg; i++ {
+		c := msg[i]
+		if c == percentByte && i+2 < lenMsg {
+			parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
+			if err != nil {
+				buf.WriteByte(c)
+			} else {
+				buf.WriteByte(byte(parsed))
+				i += 2
+			}
+		} else {
+			buf.WriteByte(c)
+		}
+	}
+	return buf.String()
+}
+
+type bufWriter struct {
+	buf       []byte
+	offset    int
+	batchSize int
+	conn      net.Conn
+	err       error
+
+	onFlush func()
+}
+
+func newBufWriter(conn net.Conn, batchSize int) *bufWriter {
+	return &bufWriter{
+		buf:       make([]byte, batchSize*2),
+		batchSize: batchSize,
+		conn:      conn,
+	}
+}
+
+func (w *bufWriter) Write(b []byte) (n int, err error) {
+	if w.err != nil {
+		return 0, w.err
+	}
+	if w.batchSize == 0 { // Buffer has been disabled.
+		return w.conn.Write(b)
+	}
+	for len(b) > 0 {
+		nn := copy(w.buf[w.offset:], b)
+		b = b[nn:]
+		w.offset += nn
+		n += nn
+		if w.offset >= w.batchSize {
+			err = w.Flush()
+		}
+	}
+	return n, err
+}
+
+func (w *bufWriter) Flush() error {
+	if w.err != nil {
+		return w.err
+	}
+	if w.offset == 0 {
+		return nil
+	}
+	if w.onFlush != nil {
+		w.onFlush()
+	}
+	_, w.err = w.conn.Write(w.buf[:w.offset])
+	w.offset = 0
+	return w.err
+}
+
+type framer struct {
+	writer *bufWriter
+	fr     *http2.Framer
+}
+
+func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderListSize uint32) *framer {
+	if writeBufferSize < 0 {
+		writeBufferSize = 0
+	}
+	var r io.Reader = conn
+	if readBufferSize > 0 {
+		r = bufio.NewReaderSize(r, readBufferSize)
+	}
+	w := newBufWriter(conn, writeBufferSize)
+	f := &framer{
+		writer: w,
+		fr:     http2.NewFramer(w, r),
+	}
+	f.fr.SetMaxReadFrameSize(http2MaxFrameLen)
+	// Opt-in to Frame reuse API on framer to reduce garbage.
+	// Frames aren't safe to read from after a subsequent call to ReadFrame.
+	f.fr.SetReuseFrames()
+	f.fr.MaxHeaderListSize = maxHeaderListSize
+	f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
+	return f
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/log.go b/vendor/google.golang.org/grpc/internal/transport/log.go
new file mode 100644
index 0000000..879df80
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/log.go
@@ -0,0 +1,44 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// This file contains wrappers for grpclog functions.
+// The transport package only logs to verbose level 2 by default.
+
+package transport
+
+import "google.golang.org/grpc/grpclog"
+
+const logLevel = 2
+
+func infof(format string, args ...interface{}) {
+	if grpclog.V(logLevel) {
+		grpclog.Infof(format, args...)
+	}
+}
+
+func warningf(format string, args ...interface{}) {
+	if grpclog.V(logLevel) {
+		grpclog.Warningf(format, args...)
+	}
+}
+
+func errorf(format string, args ...interface{}) {
+	if grpclog.V(logLevel) {
+		grpclog.Errorf(format, args...)
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/transport.go b/vendor/google.golang.org/grpc/internal/transport/transport.go
new file mode 100644
index 0000000..a30da9e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -0,0 +1,808 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package transport defines and implements message oriented communication
+// channel to complete various transactions (e.g., an RPC).  It is meant for
+// grpc-internal usage and is not intended to be imported directly by users.
+package transport
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"sync"
+	"sync/atomic"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/tap"
+)
+
+type bufferPool struct {
+	pool sync.Pool
+}
+
+func newBufferPool() *bufferPool {
+	return &bufferPool{
+		pool: sync.Pool{
+			New: func() interface{} {
+				return new(bytes.Buffer)
+			},
+		},
+	}
+}
+
+func (p *bufferPool) get() *bytes.Buffer {
+	return p.pool.Get().(*bytes.Buffer)
+}
+
+func (p *bufferPool) put(b *bytes.Buffer) {
+	p.pool.Put(b)
+}
+
+// recvMsg represents the received msg from the transport. All transport
+// protocol specific info has been removed.
+type recvMsg struct {
+	buffer *bytes.Buffer
+	// nil: received some data
+	// io.EOF: stream is completed. data is nil.
+	// other non-nil error: transport failure. data is nil.
+	err error
+}
+
+// recvBuffer is an unbounded channel of recvMsg structs.
+//
+// Note: recvBuffer differs from buffer.Unbounded only in the fact that it
+// holds a channel of recvMsg structs instead of objects implementing "item"
+// interface. recvBuffer is written to much more often and using strict recvMsg
+// structs helps avoid allocation in "recvBuffer.put"
+type recvBuffer struct {
+	c       chan recvMsg
+	mu      sync.Mutex
+	backlog []recvMsg
+	err     error
+}
+
+func newRecvBuffer() *recvBuffer {
+	b := &recvBuffer{
+		c: make(chan recvMsg, 1),
+	}
+	return b
+}
+
+func (b *recvBuffer) put(r recvMsg) {
+	b.mu.Lock()
+	if b.err != nil {
+		b.mu.Unlock()
+		// An error had occurred earlier, don't accept more
+		// data or errors.
+		return
+	}
+	b.err = r.err
+	if len(b.backlog) == 0 {
+		select {
+		case b.c <- r:
+			b.mu.Unlock()
+			return
+		default:
+		}
+	}
+	b.backlog = append(b.backlog, r)
+	b.mu.Unlock()
+}
+
+func (b *recvBuffer) load() {
+	b.mu.Lock()
+	if len(b.backlog) > 0 {
+		select {
+		case b.c <- b.backlog[0]:
+			b.backlog[0] = recvMsg{}
+			b.backlog = b.backlog[1:]
+		default:
+		}
+	}
+	b.mu.Unlock()
+}
+
+// get returns the channel that receives a recvMsg in the buffer.
+//
+// Upon receipt of a recvMsg, the caller should call load to send another
+// recvMsg onto the channel if there is any.
+func (b *recvBuffer) get() <-chan recvMsg {
+	return b.c
+}
+
+// recvBufferReader implements io.Reader interface to read the data from
+// recvBuffer.
+type recvBufferReader struct {
+	closeStream func(error) // Closes the client transport stream with the given error and nil trailer metadata.
+	ctx         context.Context
+	ctxDone     <-chan struct{} // cache of ctx.Done() (for performance).
+	recv        *recvBuffer
+	last        *bytes.Buffer // Stores the remaining data in the previous calls.
+	err         error
+	freeBuffer  func(*bytes.Buffer)
+}
+
+// Read reads the next len(p) bytes from last. If last is drained, it tries to
+// read additional data from recv. It blocks if there no additional data available
+// in recv. If Read returns any non-nil error, it will continue to return that error.
+func (r *recvBufferReader) Read(p []byte) (n int, err error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+	if r.last != nil {
+		// Read remaining data left in last call.
+		copied, _ := r.last.Read(p)
+		if r.last.Len() == 0 {
+			r.freeBuffer(r.last)
+			r.last = nil
+		}
+		return copied, nil
+	}
+	if r.closeStream != nil {
+		n, r.err = r.readClient(p)
+	} else {
+		n, r.err = r.read(p)
+	}
+	return n, r.err
+}
+
+func (r *recvBufferReader) read(p []byte) (n int, err error) {
+	select {
+	case <-r.ctxDone:
+		return 0, ContextErr(r.ctx.Err())
+	case m := <-r.recv.get():
+		return r.readAdditional(m, p)
+	}
+}
+
+func (r *recvBufferReader) readClient(p []byte) (n int, err error) {
+	// If the context is canceled, then closes the stream with nil metadata.
+	// closeStream writes its error parameter to r.recv as a recvMsg.
+	// r.readAdditional acts on that message and returns the necessary error.
+	select {
+	case <-r.ctxDone:
+		// Note that this adds the ctx error to the end of recv buffer, and
+		// reads from the head. This will delay the error until recv buffer is
+		// empty, thus will delay ctx cancellation in Recv().
+		//
+		// It's done this way to fix a race between ctx cancel and trailer. The
+		// race was, stream.Recv() may return ctx error if ctxDone wins the
+		// race, but stream.Trailer() may return a non-nil md because the stream
+		// was not marked as done when trailer is received. This closeStream
+		// call will mark stream as done, thus fix the race.
+		//
+		// TODO: delaying ctx error seems like a unnecessary side effect. What
+		// we really want is to mark the stream as done, and return ctx error
+		// faster.
+		r.closeStream(ContextErr(r.ctx.Err()))
+		m := <-r.recv.get()
+		return r.readAdditional(m, p)
+	case m := <-r.recv.get():
+		return r.readAdditional(m, p)
+	}
+}
+
+func (r *recvBufferReader) readAdditional(m recvMsg, p []byte) (n int, err error) {
+	r.recv.load()
+	if m.err != nil {
+		return 0, m.err
+	}
+	copied, _ := m.buffer.Read(p)
+	if m.buffer.Len() == 0 {
+		r.freeBuffer(m.buffer)
+		r.last = nil
+	} else {
+		r.last = m.buffer
+	}
+	return copied, nil
+}
+
+type streamState uint32
+
+const (
+	streamActive    streamState = iota
+	streamWriteDone             // EndStream sent
+	streamReadDone              // EndStream received
+	streamDone                  // the entire stream is finished.
+)
+
+// Stream represents an RPC in the transport layer.
+type Stream struct {
+	id           uint32
+	st           ServerTransport    // nil for client side Stream
+	ct           *http2Client       // nil for server side Stream
+	ctx          context.Context    // the associated context of the stream
+	cancel       context.CancelFunc // always nil for client side Stream
+	done         chan struct{}      // closed at the end of stream to unblock writers. On the client side.
+	ctxDone      <-chan struct{}    // same as done chan but for server side. Cache of ctx.Done() (for performance)
+	method       string             // the associated RPC method of the stream
+	recvCompress string
+	sendCompress string
+	buf          *recvBuffer
+	trReader     io.Reader
+	fc           *inFlow
+	wq           *writeQuota
+
+	// Callback to state application's intentions to read data. This
+	// is used to adjust flow control, if needed.
+	requestRead func(int)
+
+	headerChan       chan struct{} // closed to indicate the end of header metadata.
+	headerChanClosed uint32        // set when headerChan is closed. Used to avoid closing headerChan multiple times.
+	// headerValid indicates whether a valid header was received.  Only
+	// meaningful after headerChan is closed (always call waitOnHeader() before
+	// reading its value).  Not valid on server side.
+	headerValid bool
+
+	// hdrMu protects header and trailer metadata on the server-side.
+	hdrMu sync.Mutex
+	// On client side, header keeps the received header metadata.
+	//
+	// On server side, header keeps the header set by SetHeader(). The complete
+	// header will merged into this after t.WriteHeader() is called.
+	header  metadata.MD
+	trailer metadata.MD // the key-value map of trailer metadata.
+
+	noHeaders bool // set if the client never received headers (set only after the stream is done).
+
+	// On the server-side, headerSent is atomically set to 1 when the headers are sent out.
+	headerSent uint32
+
+	state streamState
+
+	// On client-side it is the status error received from the server.
+	// On server-side it is unused.
+	status *status.Status
+
+	bytesReceived uint32 // indicates whether any bytes have been received on this stream
+	unprocessed   uint32 // set if the server sends a refused stream or GOAWAY including this stream
+
+	// contentSubtype is the content-subtype for requests.
+	// this must be lowercase or the behavior is undefined.
+	contentSubtype string
+}
+
+// isHeaderSent is only valid on the server-side.
+func (s *Stream) isHeaderSent() bool {
+	return atomic.LoadUint32(&s.headerSent) == 1
+}
+
+// updateHeaderSent updates headerSent and returns true
+// if it was alreay set. It is valid only on server-side.
+func (s *Stream) updateHeaderSent() bool {
+	return atomic.SwapUint32(&s.headerSent, 1) == 1
+}
+
+func (s *Stream) swapState(st streamState) streamState {
+	return streamState(atomic.SwapUint32((*uint32)(&s.state), uint32(st)))
+}
+
+func (s *Stream) compareAndSwapState(oldState, newState streamState) bool {
+	return atomic.CompareAndSwapUint32((*uint32)(&s.state), uint32(oldState), uint32(newState))
+}
+
+func (s *Stream) getState() streamState {
+	return streamState(atomic.LoadUint32((*uint32)(&s.state)))
+}
+
+func (s *Stream) waitOnHeader() {
+	if s.headerChan == nil {
+		// On the server headerChan is always nil since a stream originates
+		// only after having received headers.
+		return
+	}
+	select {
+	case <-s.ctx.Done():
+		// Close the stream to prevent headers/trailers from changing after
+		// this function returns.
+		s.ct.CloseStream(s, ContextErr(s.ctx.Err()))
+		// headerChan could possibly not be closed yet if closeStream raced
+		// with operateHeaders; wait until it is closed explicitly here.
+		<-s.headerChan
+	case <-s.headerChan:
+	}
+}
+
+// RecvCompress returns the compression algorithm applied to the inbound
+// message. It is empty string if there is no compression applied.
+func (s *Stream) RecvCompress() string {
+	s.waitOnHeader()
+	return s.recvCompress
+}
+
+// SetSendCompress sets the compression algorithm to the stream.
+func (s *Stream) SetSendCompress(str string) {
+	s.sendCompress = str
+}
+
+// Done returns a channel which is closed when it receives the final status
+// from the server.
+func (s *Stream) Done() <-chan struct{} {
+	return s.done
+}
+
+// Header returns the header metadata of the stream.
+//
+// On client side, it acquires the key-value pairs of header metadata once it is
+// available. It blocks until i) the metadata is ready or ii) there is no header
+// metadata or iii) the stream is canceled/expired.
+//
+// On server side, it returns the out header after t.WriteHeader is called.  It
+// does not block and must not be called until after WriteHeader.
+func (s *Stream) Header() (metadata.MD, error) {
+	if s.headerChan == nil {
+		// On server side, return the header in stream. It will be the out
+		// header after t.WriteHeader is called.
+		return s.header.Copy(), nil
+	}
+	s.waitOnHeader()
+	if !s.headerValid {
+		return nil, s.status.Err()
+	}
+	return s.header.Copy(), nil
+}
+
+// TrailersOnly blocks until a header or trailers-only frame is received and
+// then returns true if the stream was trailers-only.  If the stream ends
+// before headers are received, returns true, nil.  Client-side only.
+func (s *Stream) TrailersOnly() bool {
+	s.waitOnHeader()
+	return s.noHeaders
+}
+
+// Trailer returns the cached trailer metedata. Note that if it is not called
+// after the entire stream is done, it could return an empty MD. Client
+// side only.
+// It can be safely read only after stream has ended that is either read
+// or write have returned io.EOF.
+func (s *Stream) Trailer() metadata.MD {
+	c := s.trailer.Copy()
+	return c
+}
+
+// ContentSubtype returns the content-subtype for a request. For example, a
+// content-subtype of "proto" will result in a content-type of
+// "application/grpc+proto". This will always be lowercase.  See
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details.
+func (s *Stream) ContentSubtype() string {
+	return s.contentSubtype
+}
+
+// Context returns the context of the stream.
+func (s *Stream) Context() context.Context {
+	return s.ctx
+}
+
+// Method returns the method for the stream.
+func (s *Stream) Method() string {
+	return s.method
+}
+
+// Status returns the status received from the server.
+// Status can be read safely only after the stream has ended,
+// that is, after Done() is closed.
+func (s *Stream) Status() *status.Status {
+	return s.status
+}
+
+// SetHeader sets the header metadata. This can be called multiple times.
+// Server side only.
+// This should not be called in parallel to other data writes.
+func (s *Stream) SetHeader(md metadata.MD) error {
+	if md.Len() == 0 {
+		return nil
+	}
+	if s.isHeaderSent() || s.getState() == streamDone {
+		return ErrIllegalHeaderWrite
+	}
+	s.hdrMu.Lock()
+	s.header = metadata.Join(s.header, md)
+	s.hdrMu.Unlock()
+	return nil
+}
+
+// SendHeader sends the given header metadata. The given metadata is
+// combined with any metadata set by previous calls to SetHeader and
+// then written to the transport stream.
+func (s *Stream) SendHeader(md metadata.MD) error {
+	return s.st.WriteHeader(s, md)
+}
+
+// SetTrailer sets the trailer metadata which will be sent with the RPC status
+// by the server. This can be called multiple times. Server side only.
+// This should not be called parallel to other data writes.
+func (s *Stream) SetTrailer(md metadata.MD) error {
+	if md.Len() == 0 {
+		return nil
+	}
+	if s.getState() == streamDone {
+		return ErrIllegalHeaderWrite
+	}
+	s.hdrMu.Lock()
+	s.trailer = metadata.Join(s.trailer, md)
+	s.hdrMu.Unlock()
+	return nil
+}
+
+func (s *Stream) write(m recvMsg) {
+	s.buf.put(m)
+}
+
+// Read reads all p bytes from the wire for this stream.
+func (s *Stream) Read(p []byte) (n int, err error) {
+	// Don't request a read if there was an error earlier
+	if er := s.trReader.(*transportReader).er; er != nil {
+		return 0, er
+	}
+	s.requestRead(len(p))
+	return io.ReadFull(s.trReader, p)
+}
+
+// tranportReader reads all the data available for this Stream from the transport and
+// passes them into the decoder, which converts them into a gRPC message stream.
+// The error is io.EOF when the stream is done or another non-nil error if
+// the stream broke.
+type transportReader struct {
+	reader io.Reader
+	// The handler to control the window update procedure for both this
+	// particular stream and the associated transport.
+	windowHandler func(int)
+	er            error
+}
+
+func (t *transportReader) Read(p []byte) (n int, err error) {
+	n, err = t.reader.Read(p)
+	if err != nil {
+		t.er = err
+		return
+	}
+	t.windowHandler(n)
+	return
+}
+
+// BytesReceived indicates whether any bytes have been received on this stream.
+func (s *Stream) BytesReceived() bool {
+	return atomic.LoadUint32(&s.bytesReceived) == 1
+}
+
+// Unprocessed indicates whether the server did not process this stream --
+// i.e. it sent a refused stream or GOAWAY including this stream ID.
+func (s *Stream) Unprocessed() bool {
+	return atomic.LoadUint32(&s.unprocessed) == 1
+}
+
+// GoString is implemented by Stream so context.String() won't
+// race when printing %#v.
+func (s *Stream) GoString() string {
+	return fmt.Sprintf("<stream: %p, %v>", s, s.method)
+}
+
+// state of transport
+type transportState int
+
+const (
+	reachable transportState = iota
+	closing
+	draining
+)
+
+// ServerConfig consists of all the configurations to establish a server transport.
+type ServerConfig struct {
+	MaxStreams            uint32
+	AuthInfo              credentials.AuthInfo
+	InTapHandle           tap.ServerInHandle
+	StatsHandler          stats.Handler
+	KeepaliveParams       keepalive.ServerParameters
+	KeepalivePolicy       keepalive.EnforcementPolicy
+	InitialWindowSize     int32
+	InitialConnWindowSize int32
+	WriteBufferSize       int
+	ReadBufferSize        int
+	ChannelzParentID      int64
+	MaxHeaderListSize     *uint32
+	HeaderTableSize       *uint32
+}
+
+// NewServerTransport creates a ServerTransport with conn or non-nil error
+// if it fails.
+func NewServerTransport(protocol string, conn net.Conn, config *ServerConfig) (ServerTransport, error) {
+	return newHTTP2Server(conn, config)
+}
+
+// ConnectOptions covers all relevant options for communicating with the server.
+type ConnectOptions struct {
+	// UserAgent is the application user agent.
+	UserAgent string
+	// Dialer specifies how to dial a network address.
+	Dialer func(context.Context, string) (net.Conn, error)
+	// FailOnNonTempDialError specifies if gRPC fails on non-temporary dial errors.
+	FailOnNonTempDialError bool
+	// PerRPCCredentials stores the PerRPCCredentials required to issue RPCs.
+	PerRPCCredentials []credentials.PerRPCCredentials
+	// TransportCredentials stores the Authenticator required to setup a client
+	// connection. Only one of TransportCredentials and CredsBundle is non-nil.
+	TransportCredentials credentials.TransportCredentials
+	// CredsBundle is the credentials bundle to be used. Only one of
+	// TransportCredentials and CredsBundle is non-nil.
+	CredsBundle credentials.Bundle
+	// KeepaliveParams stores the keepalive parameters.
+	KeepaliveParams keepalive.ClientParameters
+	// StatsHandler stores the handler for stats.
+	StatsHandler stats.Handler
+	// InitialWindowSize sets the initial window size for a stream.
+	InitialWindowSize int32
+	// InitialConnWindowSize sets the initial window size for a connection.
+	InitialConnWindowSize int32
+	// WriteBufferSize sets the size of write buffer which in turn determines how much data can be batched before it's written on the wire.
+	WriteBufferSize int
+	// ReadBufferSize sets the size of read buffer, which in turn determines how much data can be read at most for one read syscall.
+	ReadBufferSize int
+	// ChannelzParentID sets the addrConn id which initiate the creation of this client transport.
+	ChannelzParentID int64
+	// MaxHeaderListSize sets the max (uncompressed) size of header list that is prepared to be received.
+	MaxHeaderListSize *uint32
+}
+
+// TargetInfo contains the information of the target such as network address and metadata.
+type TargetInfo struct {
+	Addr      string
+	Metadata  interface{}
+	Authority string
+}
+
+// NewClientTransport establishes the transport with the required ConnectOptions
+// and returns it to the caller.
+func NewClientTransport(connectCtx, ctx context.Context, target TargetInfo, opts ConnectOptions, onPrefaceReceipt func(), onGoAway func(GoAwayReason), onClose func()) (ClientTransport, error) {
+	return newHTTP2Client(connectCtx, ctx, target, opts, onPrefaceReceipt, onGoAway, onClose)
+}
+
+// Options provides additional hints and information for message
+// transmission.
+type Options struct {
+	// Last indicates whether this write is the last piece for
+	// this stream.
+	Last bool
+}
+
+// CallHdr carries the information of a particular RPC.
+type CallHdr struct {
+	// Host specifies the peer's host.
+	Host string
+
+	// Method specifies the operation to perform.
+	Method string
+
+	// SendCompress specifies the compression algorithm applied on
+	// outbound message.
+	SendCompress string
+
+	// Creds specifies credentials.PerRPCCredentials for a call.
+	Creds credentials.PerRPCCredentials
+
+	// ContentSubtype specifies the content-subtype for a request. For example, a
+	// content-subtype of "proto" will result in a content-type of
+	// "application/grpc+proto". The value of ContentSubtype must be all
+	// lowercase, otherwise the behavior is undefined. See
+	// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests
+	// for more details.
+	ContentSubtype string
+
+	PreviousAttempts int // value of grpc-previous-rpc-attempts header to set
+}
+
+// ClientTransport is the common interface for all gRPC client-side transport
+// implementations.
+type ClientTransport interface {
+	// Close tears down this transport. Once it returns, the transport
+	// should not be accessed any more. The caller must make sure this
+	// is called only once.
+	Close() error
+
+	// GracefulClose starts to tear down the transport: the transport will stop
+	// accepting new RPCs and NewStream will return error. Once all streams are
+	// finished, the transport will close.
+	//
+	// It does not block.
+	GracefulClose()
+
+	// Write sends the data for the given stream. A nil stream indicates
+	// the write is to be performed on the transport as a whole.
+	Write(s *Stream, hdr []byte, data []byte, opts *Options) error
+
+	// NewStream creates a Stream for an RPC.
+	NewStream(ctx context.Context, callHdr *CallHdr) (*Stream, error)
+
+	// CloseStream clears the footprint of a stream when the stream is
+	// not needed any more. The err indicates the error incurred when
+	// CloseStream is called. Must be called when a stream is finished
+	// unless the associated transport is closing.
+	CloseStream(stream *Stream, err error)
+
+	// Error returns a channel that is closed when some I/O error
+	// happens. Typically the caller should have a goroutine to monitor
+	// this in order to take action (e.g., close the current transport
+	// and create a new one) in error case. It should not return nil
+	// once the transport is initiated.
+	Error() <-chan struct{}
+
+	// GoAway returns a channel that is closed when ClientTransport
+	// receives the draining signal from the server (e.g., GOAWAY frame in
+	// HTTP/2).
+	GoAway() <-chan struct{}
+
+	// GetGoAwayReason returns the reason why GoAway frame was received.
+	GetGoAwayReason() GoAwayReason
+
+	// RemoteAddr returns the remote network address.
+	RemoteAddr() net.Addr
+
+	// IncrMsgSent increments the number of message sent through this transport.
+	IncrMsgSent()
+
+	// IncrMsgRecv increments the number of message received through this transport.
+	IncrMsgRecv()
+}
+
+// ServerTransport is the common interface for all gRPC server-side transport
+// implementations.
+//
+// Methods may be called concurrently from multiple goroutines, but
+// Write methods for a given Stream will be called serially.
+type ServerTransport interface {
+	// HandleStreams receives incoming streams using the given handler.
+	HandleStreams(func(*Stream), func(context.Context, string) context.Context)
+
+	// WriteHeader sends the header metadata for the given stream.
+	// WriteHeader may not be called on all streams.
+	WriteHeader(s *Stream, md metadata.MD) error
+
+	// Write sends the data for the given stream.
+	// Write may not be called on all streams.
+	Write(s *Stream, hdr []byte, data []byte, opts *Options) error
+
+	// WriteStatus sends the status of a stream to the client.  WriteStatus is
+	// the final call made on a stream and always occurs.
+	WriteStatus(s *Stream, st *status.Status) error
+
+	// Close tears down the transport. Once it is called, the transport
+	// should not be accessed any more. All the pending streams and their
+	// handlers will be terminated asynchronously.
+	Close() error
+
+	// RemoteAddr returns the remote network address.
+	RemoteAddr() net.Addr
+
+	// Drain notifies the client this ServerTransport stops accepting new RPCs.
+	Drain()
+
+	// IncrMsgSent increments the number of message sent through this transport.
+	IncrMsgSent()
+
+	// IncrMsgRecv increments the number of message received through this transport.
+	IncrMsgRecv()
+}
+
+// connectionErrorf creates an ConnectionError with the specified error description.
+func connectionErrorf(temp bool, e error, format string, a ...interface{}) ConnectionError {
+	return ConnectionError{
+		Desc: fmt.Sprintf(format, a...),
+		temp: temp,
+		err:  e,
+	}
+}
+
+// ConnectionError is an error that results in the termination of the
+// entire connection and the retry of all the active streams.
+type ConnectionError struct {
+	Desc string
+	temp bool
+	err  error
+}
+
+func (e ConnectionError) Error() string {
+	return fmt.Sprintf("connection error: desc = %q", e.Desc)
+}
+
+// Temporary indicates if this connection error is temporary or fatal.
+func (e ConnectionError) Temporary() bool {
+	return e.temp
+}
+
+// Origin returns the original error of this connection error.
+func (e ConnectionError) Origin() error {
+	// Never return nil error here.
+	// If the original error is nil, return itself.
+	if e.err == nil {
+		return e
+	}
+	return e.err
+}
+
+var (
+	// ErrConnClosing indicates that the transport is closing.
+	ErrConnClosing = connectionErrorf(true, nil, "transport is closing")
+	// errStreamDrain indicates that the stream is rejected because the
+	// connection is draining. This could be caused by goaway or balancer
+	// removing the address.
+	errStreamDrain = status.Error(codes.Unavailable, "the connection is draining")
+	// errStreamDone is returned from write at the client side to indiacte application
+	// layer of an error.
+	errStreamDone = errors.New("the stream is done")
+	// StatusGoAway indicates that the server sent a GOAWAY that included this
+	// stream's ID in unprocessed RPCs.
+	statusGoAway = status.New(codes.Unavailable, "the stream is rejected because server is draining the connection")
+)
+
+// GoAwayReason contains the reason for the GoAway frame received.
+type GoAwayReason uint8
+
+const (
+	// GoAwayInvalid indicates that no GoAway frame is received.
+	GoAwayInvalid GoAwayReason = 0
+	// GoAwayNoReason is the default value when GoAway frame is received.
+	GoAwayNoReason GoAwayReason = 1
+	// GoAwayTooManyPings indicates that a GoAway frame with
+	// ErrCodeEnhanceYourCalm was received and that the debug data said
+	// "too_many_pings".
+	GoAwayTooManyPings GoAwayReason = 2
+)
+
+// channelzData is used to store channelz related data for http2Client and http2Server.
+// These fields cannot be embedded in the original structs (e.g. http2Client), since to do atomic
+// operation on int64 variable on 32-bit machine, user is responsible to enforce memory alignment.
+// Here, by grouping those int64 fields inside a struct, we are enforcing the alignment.
+type channelzData struct {
+	kpCount int64
+	// The number of streams that have started, including already finished ones.
+	streamsStarted int64
+	// Client side: The number of streams that have ended successfully by receiving
+	// EoS bit set frame from server.
+	// Server side: The number of streams that have ended successfully by sending
+	// frame with EoS bit set.
+	streamsSucceeded int64
+	streamsFailed    int64
+	// lastStreamCreatedTime stores the timestamp that the last stream gets created. It is of int64 type
+	// instead of time.Time since it's more costly to atomically update time.Time variable than int64
+	// variable. The same goes for lastMsgSentTime and lastMsgRecvTime.
+	lastStreamCreatedTime int64
+	msgSent               int64
+	msgRecv               int64
+	lastMsgSentTime       int64
+	lastMsgRecvTime       int64
+}
+
+// ContextErr converts the error from context package into a status error.
+func ContextErr(err error) error {
+	switch err {
+	case context.DeadlineExceeded:
+		return status.Error(codes.DeadlineExceeded, err.Error())
+	case context.Canceled:
+		return status.Error(codes.Canceled, err.Error())
+	}
+	return status.Errorf(codes.Internal, "Unexpected error from context packet: %v", err)
+}
diff --git a/vendor/google.golang.org/grpc/keepalive/keepalive.go b/vendor/google.golang.org/grpc/keepalive/keepalive.go
new file mode 100644
index 0000000..34d31b5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/keepalive/keepalive.go
@@ -0,0 +1,85 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package keepalive defines configurable parameters for point-to-point
+// healthcheck.
+package keepalive
+
+import (
+	"time"
+)
+
+// ClientParameters is used to set keepalive parameters on the client-side.
+// These configure how the client will actively probe to notice when a
+// connection is broken and send pings so intermediaries will be aware of the
+// liveness of the connection. Make sure these parameters are set in
+// coordination with the keepalive policy on the server, as incompatible
+// settings can result in closing of connection.
+type ClientParameters struct {
+	// After a duration of this time if the client doesn't see any activity it
+	// pings the server to see if the transport is still alive.
+	// If set below 10s, a minimum value of 10s will be used instead.
+	Time time.Duration // The current default value is infinity.
+	// After having pinged for keepalive check, the client waits for a duration
+	// of Timeout and if no activity is seen even after that the connection is
+	// closed.
+	Timeout time.Duration // The current default value is 20 seconds.
+	// If true, client sends keepalive pings even with no active RPCs. If false,
+	// when there are no active RPCs, Time and Timeout will be ignored and no
+	// keepalive pings will be sent.
+	PermitWithoutStream bool // false by default.
+}
+
+// ServerParameters is used to set keepalive and max-age parameters on the
+// server-side.
+type ServerParameters struct {
+	// MaxConnectionIdle is a duration for the amount of time after which an
+	// idle connection would be closed by sending a GoAway. Idleness duration is
+	// defined since the most recent time the number of outstanding RPCs became
+	// zero or the connection establishment.
+	MaxConnectionIdle time.Duration // The current default value is infinity.
+	// MaxConnectionAge is a duration for the maximum amount of time a
+	// connection may exist before it will be closed by sending a GoAway. A
+	// random jitter of +/-10% will be added to MaxConnectionAge to spread out
+	// connection storms.
+	MaxConnectionAge time.Duration // The current default value is infinity.
+	// MaxConnectionAgeGrace is an additive period after MaxConnectionAge after
+	// which the connection will be forcibly closed.
+	MaxConnectionAgeGrace time.Duration // The current default value is infinity.
+	// After a duration of this time if the server doesn't see any activity it
+	// pings the client to see if the transport is still alive.
+	// If set below 1s, a minimum value of 1s will be used instead.
+	Time time.Duration // The current default value is 2 hours.
+	// After having pinged for keepalive check, the server waits for a duration
+	// of Timeout and if no activity is seen even after that the connection is
+	// closed.
+	Timeout time.Duration // The current default value is 20 seconds.
+}
+
+// EnforcementPolicy is used to set keepalive enforcement policy on the
+// server-side. Server will close connection with a client that violates this
+// policy.
+type EnforcementPolicy struct {
+	// MinTime is the minimum amount of time a client should wait before sending
+	// a keepalive ping.
+	MinTime time.Duration // The current default value is 5 minutes.
+	// If true, server allows keepalive pings even when there are no active
+	// streams(RPCs). If false, and client sends ping when there are no active
+	// streams, server will send GOAWAY and close the connection.
+	PermitWithoutStream bool // false by default.
+}
diff --git a/vendor/google.golang.org/grpc/metadata/metadata.go b/vendor/google.golang.org/grpc/metadata/metadata.go
new file mode 100644
index 0000000..cf6d1b9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -0,0 +1,209 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package metadata define the structure of the metadata supported by gRPC library.
+// Please refer to https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
+// for more information about custom-metadata.
+package metadata // import "google.golang.org/grpc/metadata"
+
+import (
+	"context"
+	"fmt"
+	"strings"
+)
+
+// DecodeKeyValue returns k, v, nil.
+//
+// Deprecated: use k and v directly instead.
+func DecodeKeyValue(k, v string) (string, string, error) {
+	return k, v, nil
+}
+
+// MD is a mapping from metadata keys to values. Users should use the following
+// two convenience functions New and Pairs to generate MD.
+type MD map[string][]string
+
+// New creates an MD from a given key-value map.
+//
+// Only the following ASCII characters are allowed in keys:
+//  - digits: 0-9
+//  - uppercase letters: A-Z (normalized to lower)
+//  - lowercase letters: a-z
+//  - special characters: -_.
+// Uppercase letters are automatically converted to lowercase.
+//
+// Keys beginning with "grpc-" are reserved for grpc-internal use only and may
+// result in errors if set in metadata.
+func New(m map[string]string) MD {
+	md := MD{}
+	for k, val := range m {
+		key := strings.ToLower(k)
+		md[key] = append(md[key], val)
+	}
+	return md
+}
+
+// Pairs returns an MD formed by the mapping of key, value ...
+// Pairs panics if len(kv) is odd.
+//
+// Only the following ASCII characters are allowed in keys:
+//  - digits: 0-9
+//  - uppercase letters: A-Z (normalized to lower)
+//  - lowercase letters: a-z
+//  - special characters: -_.
+// Uppercase letters are automatically converted to lowercase.
+//
+// Keys beginning with "grpc-" are reserved for grpc-internal use only and may
+// result in errors if set in metadata.
+func Pairs(kv ...string) MD {
+	if len(kv)%2 == 1 {
+		panic(fmt.Sprintf("metadata: Pairs got the odd number of input pairs for metadata: %d", len(kv)))
+	}
+	md := MD{}
+	var key string
+	for i, s := range kv {
+		if i%2 == 0 {
+			key = strings.ToLower(s)
+			continue
+		}
+		md[key] = append(md[key], s)
+	}
+	return md
+}
+
+// Len returns the number of items in md.
+func (md MD) Len() int {
+	return len(md)
+}
+
+// Copy returns a copy of md.
+func (md MD) Copy() MD {
+	return Join(md)
+}
+
+// Get obtains the values for a given key.
+func (md MD) Get(k string) []string {
+	k = strings.ToLower(k)
+	return md[k]
+}
+
+// Set sets the value of a given key with a slice of values.
+func (md MD) Set(k string, vals ...string) {
+	if len(vals) == 0 {
+		return
+	}
+	k = strings.ToLower(k)
+	md[k] = vals
+}
+
+// Append adds the values to key k, not overwriting what was already stored at that key.
+func (md MD) Append(k string, vals ...string) {
+	if len(vals) == 0 {
+		return
+	}
+	k = strings.ToLower(k)
+	md[k] = append(md[k], vals...)
+}
+
+// Join joins any number of mds into a single MD.
+// The order of values for each key is determined by the order in which
+// the mds containing those values are presented to Join.
+func Join(mds ...MD) MD {
+	out := MD{}
+	for _, md := range mds {
+		for k, v := range md {
+			out[k] = append(out[k], v...)
+		}
+	}
+	return out
+}
+
+type mdIncomingKey struct{}
+type mdOutgoingKey struct{}
+
+// NewIncomingContext creates a new context with incoming md attached.
+func NewIncomingContext(ctx context.Context, md MD) context.Context {
+	return context.WithValue(ctx, mdIncomingKey{}, md)
+}
+
+// NewOutgoingContext creates a new context with outgoing md attached. If used
+// in conjunction with AppendToOutgoingContext, NewOutgoingContext will
+// overwrite any previously-appended metadata.
+func NewOutgoingContext(ctx context.Context, md MD) context.Context {
+	return context.WithValue(ctx, mdOutgoingKey{}, rawMD{md: md})
+}
+
+// AppendToOutgoingContext returns a new context with the provided kv merged
+// with any existing metadata in the context. Please refer to the
+// documentation of Pairs for a description of kv.
+func AppendToOutgoingContext(ctx context.Context, kv ...string) context.Context {
+	if len(kv)%2 == 1 {
+		panic(fmt.Sprintf("metadata: AppendToOutgoingContext got an odd number of input pairs for metadata: %d", len(kv)))
+	}
+	md, _ := ctx.Value(mdOutgoingKey{}).(rawMD)
+	added := make([][]string, len(md.added)+1)
+	copy(added, md.added)
+	added[len(added)-1] = make([]string, len(kv))
+	copy(added[len(added)-1], kv)
+	return context.WithValue(ctx, mdOutgoingKey{}, rawMD{md: md.md, added: added})
+}
+
+// FromIncomingContext returns the incoming metadata in ctx if it exists.  The
+// returned MD should not be modified. Writing to it may cause races.
+// Modification should be made to copies of the returned MD.
+func FromIncomingContext(ctx context.Context) (md MD, ok bool) {
+	md, ok = ctx.Value(mdIncomingKey{}).(MD)
+	return
+}
+
+// FromOutgoingContextRaw returns the un-merged, intermediary contents
+// of rawMD. Remember to perform strings.ToLower on the keys. The returned
+// MD should not be modified. Writing to it may cause races. Modification
+// should be made to copies of the returned MD.
+//
+// This is intended for gRPC-internal use ONLY.
+func FromOutgoingContextRaw(ctx context.Context) (MD, [][]string, bool) {
+	raw, ok := ctx.Value(mdOutgoingKey{}).(rawMD)
+	if !ok {
+		return nil, nil, false
+	}
+
+	return raw.md, raw.added, true
+}
+
+// FromOutgoingContext returns the outgoing metadata in ctx if it exists.  The
+// returned MD should not be modified. Writing to it may cause races.
+// Modification should be made to copies of the returned MD.
+func FromOutgoingContext(ctx context.Context) (MD, bool) {
+	raw, ok := ctx.Value(mdOutgoingKey{}).(rawMD)
+	if !ok {
+		return nil, false
+	}
+
+	mds := make([]MD, 0, len(raw.added)+1)
+	mds = append(mds, raw.md)
+	for _, vv := range raw.added {
+		mds = append(mds, Pairs(vv...))
+	}
+	return Join(mds...), ok
+}
+
+type rawMD struct {
+	md    MD
+	added [][]string
+}
diff --git a/vendor/google.golang.org/grpc/naming/dns_resolver.go b/vendor/google.golang.org/grpc/naming/dns_resolver.go
new file mode 100644
index 0000000..c9f79dc
--- /dev/null
+++ b/vendor/google.golang.org/grpc/naming/dns_resolver.go
@@ -0,0 +1,293 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package naming
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"time"
+
+	"google.golang.org/grpc/grpclog"
+)
+
+const (
+	defaultPort = "443"
+	defaultFreq = time.Minute * 30
+)
+
+var (
+	errMissingAddr  = errors.New("missing address")
+	errWatcherClose = errors.New("watcher has been closed")
+
+	lookupHost = net.DefaultResolver.LookupHost
+	lookupSRV  = net.DefaultResolver.LookupSRV
+)
+
+// NewDNSResolverWithFreq creates a DNS Resolver that can resolve DNS names, and
+// create watchers that poll the DNS server using the frequency set by freq.
+func NewDNSResolverWithFreq(freq time.Duration) (Resolver, error) {
+	return &dnsResolver{freq: freq}, nil
+}
+
+// NewDNSResolver creates a DNS Resolver that can resolve DNS names, and create
+// watchers that poll the DNS server using the default frequency defined by defaultFreq.
+func NewDNSResolver() (Resolver, error) {
+	return NewDNSResolverWithFreq(defaultFreq)
+}
+
+// dnsResolver handles name resolution for names following the DNS scheme
+type dnsResolver struct {
+	// frequency of polling the DNS server that the watchers created by this resolver will use.
+	freq time.Duration
+}
+
+// formatIP returns ok = false if addr is not a valid textual representation of an IP address.
+// If addr is an IPv4 address, return the addr and ok = true.
+// If addr is an IPv6 address, return the addr enclosed in square brackets and ok = true.
+func formatIP(addr string) (addrIP string, ok bool) {
+	ip := net.ParseIP(addr)
+	if ip == nil {
+		return "", false
+	}
+	if ip.To4() != nil {
+		return addr, true
+	}
+	return "[" + addr + "]", true
+}
+
+// parseTarget takes the user input target string, returns formatted host and port info.
+// If target doesn't specify a port, set the port to be the defaultPort.
+// If target is in IPv6 format and host-name is enclosed in square brackets, brackets
+// are stripped when setting the host.
+// examples:
+// target: "www.google.com" returns host: "www.google.com", port: "443"
+// target: "ipv4-host:80" returns host: "ipv4-host", port: "80"
+// target: "[ipv6-host]" returns host: "ipv6-host", port: "443"
+// target: ":80" returns host: "localhost", port: "80"
+// target: ":" returns host: "localhost", port: "443"
+func parseTarget(target string) (host, port string, err error) {
+	if target == "" {
+		return "", "", errMissingAddr
+	}
+
+	if ip := net.ParseIP(target); ip != nil {
+		// target is an IPv4 or IPv6(without brackets) address
+		return target, defaultPort, nil
+	}
+	if host, port, err := net.SplitHostPort(target); err == nil {
+		// target has port, i.e ipv4-host:port, [ipv6-host]:port, host-name:port
+		if host == "" {
+			// Keep consistent with net.Dial(): If the host is empty, as in ":80", the local system is assumed.
+			host = "localhost"
+		}
+		if port == "" {
+			// If the port field is empty(target ends with colon), e.g. "[::1]:", defaultPort is used.
+			port = defaultPort
+		}
+		return host, port, nil
+	}
+	if host, port, err := net.SplitHostPort(target + ":" + defaultPort); err == nil {
+		// target doesn't have port
+		return host, port, nil
+	}
+	return "", "", fmt.Errorf("invalid target address %v", target)
+}
+
+// Resolve creates a watcher that watches the name resolution of the target.
+func (r *dnsResolver) Resolve(target string) (Watcher, error) {
+	host, port, err := parseTarget(target)
+	if err != nil {
+		return nil, err
+	}
+
+	if net.ParseIP(host) != nil {
+		ipWatcher := &ipWatcher{
+			updateChan: make(chan *Update, 1),
+		}
+		host, _ = formatIP(host)
+		ipWatcher.updateChan <- &Update{Op: Add, Addr: host + ":" + port}
+		return ipWatcher, nil
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	return &dnsWatcher{
+		r:      r,
+		host:   host,
+		port:   port,
+		ctx:    ctx,
+		cancel: cancel,
+		t:      time.NewTimer(0),
+	}, nil
+}
+
+// dnsWatcher watches for the name resolution update for a specific target
+type dnsWatcher struct {
+	r    *dnsResolver
+	host string
+	port string
+	// The latest resolved address set
+	curAddrs map[string]*Update
+	ctx      context.Context
+	cancel   context.CancelFunc
+	t        *time.Timer
+}
+
+// ipWatcher watches for the name resolution update for an IP address.
+type ipWatcher struct {
+	updateChan chan *Update
+}
+
+// Next returns the address resolution Update for the target. For IP address,
+// the resolution is itself, thus polling name server is unnecessary. Therefore,
+// Next() will return an Update the first time it is called, and will be blocked
+// for all following calls as no Update exists until watcher is closed.
+func (i *ipWatcher) Next() ([]*Update, error) {
+	u, ok := <-i.updateChan
+	if !ok {
+		return nil, errWatcherClose
+	}
+	return []*Update{u}, nil
+}
+
+// Close closes the ipWatcher.
+func (i *ipWatcher) Close() {
+	close(i.updateChan)
+}
+
+// AddressType indicates the address type returned by name resolution.
+type AddressType uint8
+
+const (
+	// Backend indicates the server is a backend server.
+	Backend AddressType = iota
+	// GRPCLB indicates the server is a grpclb load balancer.
+	GRPCLB
+)
+
+// AddrMetadataGRPCLB contains the information the name resolver for grpclb should provide. The
+// name resolver used by the grpclb balancer is required to provide this type of metadata in
+// its address updates.
+type AddrMetadataGRPCLB struct {
+	// AddrType is the type of server (grpc load balancer or backend).
+	AddrType AddressType
+	// ServerName is the name of the grpc load balancer. Used for authentication.
+	ServerName string
+}
+
+// compileUpdate compares the old resolved addresses and newly resolved addresses,
+// and generates an update list
+func (w *dnsWatcher) compileUpdate(newAddrs map[string]*Update) []*Update {
+	var res []*Update
+	for a, u := range w.curAddrs {
+		if _, ok := newAddrs[a]; !ok {
+			u.Op = Delete
+			res = append(res, u)
+		}
+	}
+	for a, u := range newAddrs {
+		if _, ok := w.curAddrs[a]; !ok {
+			res = append(res, u)
+		}
+	}
+	return res
+}
+
+func (w *dnsWatcher) lookupSRV() map[string]*Update {
+	newAddrs := make(map[string]*Update)
+	_, srvs, err := lookupSRV(w.ctx, "grpclb", "tcp", w.host)
+	if err != nil {
+		grpclog.Infof("grpc: failed dns SRV record lookup due to %v.\n", err)
+		return nil
+	}
+	for _, s := range srvs {
+		lbAddrs, err := lookupHost(w.ctx, s.Target)
+		if err != nil {
+			grpclog.Warningf("grpc: failed load balancer address dns lookup due to %v.\n", err)
+			continue
+		}
+		for _, a := range lbAddrs {
+			a, ok := formatIP(a)
+			if !ok {
+				grpclog.Errorf("grpc: failed IP parsing due to %v.\n", err)
+				continue
+			}
+			addr := a + ":" + strconv.Itoa(int(s.Port))
+			newAddrs[addr] = &Update{Addr: addr,
+				Metadata: AddrMetadataGRPCLB{AddrType: GRPCLB, ServerName: s.Target}}
+		}
+	}
+	return newAddrs
+}
+
+func (w *dnsWatcher) lookupHost() map[string]*Update {
+	newAddrs := make(map[string]*Update)
+	addrs, err := lookupHost(w.ctx, w.host)
+	if err != nil {
+		grpclog.Warningf("grpc: failed dns A record lookup due to %v.\n", err)
+		return nil
+	}
+	for _, a := range addrs {
+		a, ok := formatIP(a)
+		if !ok {
+			grpclog.Errorf("grpc: failed IP parsing due to %v.\n", err)
+			continue
+		}
+		addr := a + ":" + w.port
+		newAddrs[addr] = &Update{Addr: addr}
+	}
+	return newAddrs
+}
+
+func (w *dnsWatcher) lookup() []*Update {
+	newAddrs := w.lookupSRV()
+	if newAddrs == nil {
+		// If failed to get any balancer address (either no corresponding SRV for the
+		// target, or caused by failure during resolution/parsing of the balancer target),
+		// return any A record info available.
+		newAddrs = w.lookupHost()
+	}
+	result := w.compileUpdate(newAddrs)
+	w.curAddrs = newAddrs
+	return result
+}
+
+// Next returns the resolved address update(delta) for the target. If there's no
+// change, it will sleep for 30 mins and try to resolve again after that.
+func (w *dnsWatcher) Next() ([]*Update, error) {
+	for {
+		select {
+		case <-w.ctx.Done():
+			return nil, errWatcherClose
+		case <-w.t.C:
+		}
+		result := w.lookup()
+		// Next lookup should happen after an interval defined by w.r.freq.
+		w.t.Reset(w.r.freq)
+		if len(result) > 0 {
+			return result, nil
+		}
+	}
+}
+
+func (w *dnsWatcher) Close() {
+	w.cancel()
+}
diff --git a/vendor/google.golang.org/grpc/naming/naming.go b/vendor/google.golang.org/grpc/naming/naming.go
new file mode 100644
index 0000000..f4c1c8b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/naming/naming.go
@@ -0,0 +1,68 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package naming defines the naming API and related data structures for gRPC.
+//
+// This package is deprecated: please use package resolver instead.
+package naming
+
+// Operation defines the corresponding operations for a name resolution change.
+//
+// Deprecated: please use package resolver.
+type Operation uint8
+
+const (
+	// Add indicates a new address is added.
+	Add Operation = iota
+	// Delete indicates an existing address is deleted.
+	Delete
+)
+
+// Update defines a name resolution update. Notice that it is not valid having both
+// empty string Addr and nil Metadata in an Update.
+//
+// Deprecated: please use package resolver.
+type Update struct {
+	// Op indicates the operation of the update.
+	Op Operation
+	// Addr is the updated address. It is empty string if there is no address update.
+	Addr string
+	// Metadata is the updated metadata. It is nil if there is no metadata update.
+	// Metadata is not required for a custom naming implementation.
+	Metadata interface{}
+}
+
+// Resolver creates a Watcher for a target to track its resolution changes.
+//
+// Deprecated: please use package resolver.
+type Resolver interface {
+	// Resolve creates a Watcher for target.
+	Resolve(target string) (Watcher, error)
+}
+
+// Watcher watches for the updates on the specified target.
+//
+// Deprecated: please use package resolver.
+type Watcher interface {
+	// Next blocks until an update or error happens. It may return one or more
+	// updates. The first call should get the full set of the results. It should
+	// return an error if and only if Watcher cannot recover.
+	Next() ([]*Update, error)
+	// Close closes the Watcher.
+	Close()
+}
diff --git a/vendor/google.golang.org/grpc/peer/peer.go b/vendor/google.golang.org/grpc/peer/peer.go
new file mode 100644
index 0000000..e01d219
--- /dev/null
+++ b/vendor/google.golang.org/grpc/peer/peer.go
@@ -0,0 +1,51 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package peer defines various peer information associated with RPCs and
+// corresponding utils.
+package peer
+
+import (
+	"context"
+	"net"
+
+	"google.golang.org/grpc/credentials"
+)
+
+// Peer contains the information of the peer for an RPC, such as the address
+// and authentication information.
+type Peer struct {
+	// Addr is the peer address.
+	Addr net.Addr
+	// AuthInfo is the authentication information of the transport.
+	// It is nil if there is no transport security being used.
+	AuthInfo credentials.AuthInfo
+}
+
+type peerKey struct{}
+
+// NewContext creates a new context with peer information attached.
+func NewContext(ctx context.Context, p *Peer) context.Context {
+	return context.WithValue(ctx, peerKey{}, p)
+}
+
+// FromContext returns the peer information in ctx if it exists.
+func FromContext(ctx context.Context) (p *Peer, ok bool) {
+	p, ok = ctx.Value(peerKey{}).(*Peer)
+	return
+}
diff --git a/vendor/google.golang.org/grpc/picker_wrapper.go b/vendor/google.golang.org/grpc/picker_wrapper.go
new file mode 100644
index 0000000..0044789
--- /dev/null
+++ b/vendor/google.golang.org/grpc/picker_wrapper.go
@@ -0,0 +1,229 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"sync"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/status"
+)
+
+// v2PickerWrapper wraps a balancer.Picker while providing the
+// balancer.V2Picker API.  It requires a pickerWrapper to generate errors
+// including the latest connectionError.  To be deleted when balancer.Picker is
+// updated to the balancer.V2Picker API.
+type v2PickerWrapper struct {
+	picker  balancer.Picker
+	connErr *connErr
+}
+
+func (v *v2PickerWrapper) Pick(info balancer.PickInfo) (balancer.PickResult, error) {
+	sc, done, err := v.picker.Pick(info.Ctx, info)
+	if err != nil {
+		if err == balancer.ErrTransientFailure {
+			return balancer.PickResult{}, balancer.TransientFailureError(fmt.Errorf("%v, latest connection error: %v", err, v.connErr.connectionError()))
+		}
+		return balancer.PickResult{}, err
+	}
+	return balancer.PickResult{SubConn: sc, Done: done}, nil
+}
+
+// pickerWrapper is a wrapper of balancer.Picker. It blocks on certain pick
+// actions and unblock when there's a picker update.
+type pickerWrapper struct {
+	mu         sync.Mutex
+	done       bool
+	blockingCh chan struct{}
+	picker     balancer.V2Picker
+
+	// The latest connection error.  TODO: remove when V1 picker is deprecated;
+	// balancer should be responsible for providing the error.
+	*connErr
+}
+
+type connErr struct {
+	mu  sync.Mutex
+	err error
+}
+
+func (c *connErr) updateConnectionError(err error) {
+	c.mu.Lock()
+	c.err = err
+	c.mu.Unlock()
+}
+
+func (c *connErr) connectionError() error {
+	c.mu.Lock()
+	err := c.err
+	c.mu.Unlock()
+	return err
+}
+
+func newPickerWrapper() *pickerWrapper {
+	return &pickerWrapper{blockingCh: make(chan struct{}), connErr: &connErr{}}
+}
+
+// updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
+func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
+	pw.updatePickerV2(&v2PickerWrapper{picker: p, connErr: pw.connErr})
+}
+
+// updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
+func (pw *pickerWrapper) updatePickerV2(p balancer.V2Picker) {
+	pw.mu.Lock()
+	if pw.done {
+		pw.mu.Unlock()
+		return
+	}
+	pw.picker = p
+	// pw.blockingCh should never be nil.
+	close(pw.blockingCh)
+	pw.blockingCh = make(chan struct{})
+	pw.mu.Unlock()
+}
+
+func doneChannelzWrapper(acw *acBalancerWrapper, done func(balancer.DoneInfo)) func(balancer.DoneInfo) {
+	acw.mu.Lock()
+	ac := acw.ac
+	acw.mu.Unlock()
+	ac.incrCallsStarted()
+	return func(b balancer.DoneInfo) {
+		if b.Err != nil && b.Err != io.EOF {
+			ac.incrCallsFailed()
+		} else {
+			ac.incrCallsSucceeded()
+		}
+		if done != nil {
+			done(b)
+		}
+	}
+}
+
+// pick returns the transport that will be used for the RPC.
+// It may block in the following cases:
+// - there's no picker
+// - the current picker returns ErrNoSubConnAvailable
+// - the current picker returns other errors and failfast is false.
+// - the subConn returned by the current picker is not READY
+// When one of these situations happens, pick blocks until the picker gets updated.
+func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.PickInfo) (transport.ClientTransport, func(balancer.DoneInfo), error) {
+	var ch chan struct{}
+
+	var lastPickErr error
+	for {
+		pw.mu.Lock()
+		if pw.done {
+			pw.mu.Unlock()
+			return nil, nil, ErrClientConnClosing
+		}
+
+		if pw.picker == nil {
+			ch = pw.blockingCh
+		}
+		if ch == pw.blockingCh {
+			// This could happen when either:
+			// - pw.picker is nil (the previous if condition), or
+			// - has called pick on the current picker.
+			pw.mu.Unlock()
+			select {
+			case <-ctx.Done():
+				var errStr string
+				if lastPickErr != nil {
+					errStr = "latest balancer error: " + lastPickErr.Error()
+				} else if connectionErr := pw.connectionError(); connectionErr != nil {
+					errStr = "latest connection error: " + connectionErr.Error()
+				} else {
+					errStr = ctx.Err().Error()
+				}
+				switch ctx.Err() {
+				case context.DeadlineExceeded:
+					return nil, nil, status.Error(codes.DeadlineExceeded, errStr)
+				case context.Canceled:
+					return nil, nil, status.Error(codes.Canceled, errStr)
+				}
+			case <-ch:
+			}
+			continue
+		}
+
+		ch = pw.blockingCh
+		p := pw.picker
+		pw.mu.Unlock()
+
+		pickResult, err := p.Pick(info)
+
+		if err != nil {
+			if err == balancer.ErrNoSubConnAvailable {
+				continue
+			}
+			if tfe, ok := err.(interface{ IsTransientFailure() bool }); ok && tfe.IsTransientFailure() {
+				if !failfast {
+					lastPickErr = err
+					continue
+				}
+				return nil, nil, status.Error(codes.Unavailable, err.Error())
+			}
+			if _, ok := status.FromError(err); ok {
+				return nil, nil, err
+			}
+			// err is some other error.
+			return nil, nil, status.Error(codes.Unknown, err.Error())
+		}
+
+		acw, ok := pickResult.SubConn.(*acBalancerWrapper)
+		if !ok {
+			grpclog.Error("subconn returned from pick is not *acBalancerWrapper")
+			continue
+		}
+		if t, ok := acw.getAddrConn().getReadyTransport(); ok {
+			if channelz.IsOn() {
+				return t, doneChannelzWrapper(acw, pickResult.Done), nil
+			}
+			return t, pickResult.Done, nil
+		}
+		if pickResult.Done != nil {
+			// Calling done with nil error, no bytes sent and no bytes received.
+			// DoneInfo with default value works.
+			pickResult.Done(balancer.DoneInfo{})
+		}
+		grpclog.Infof("blockingPicker: the picked transport is not ready, loop back to repick")
+		// If ok == false, ac.state is not READY.
+		// A valid picker always returns READY subConn. This means the state of ac
+		// just changed, and picker will be updated shortly.
+		// continue back to the beginning of the for loop to repick.
+	}
+}
+
+func (pw *pickerWrapper) close() {
+	pw.mu.Lock()
+	defer pw.mu.Unlock()
+	if pw.done {
+		return
+	}
+	pw.done = true
+	close(pw.blockingCh)
+}
diff --git a/vendor/google.golang.org/grpc/pickfirst.go b/vendor/google.golang.org/grpc/pickfirst.go
new file mode 100644
index 0000000..c43dac9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/pickfirst.go
@@ -0,0 +1,159 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"errors"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/status"
+)
+
+// PickFirstBalancerName is the name of the pick_first balancer.
+const PickFirstBalancerName = "pick_first"
+
+func newPickfirstBuilder() balancer.Builder {
+	return &pickfirstBuilder{}
+}
+
+type pickfirstBuilder struct{}
+
+func (*pickfirstBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
+	return &pickfirstBalancer{cc: cc}
+}
+
+func (*pickfirstBuilder) Name() string {
+	return PickFirstBalancerName
+}
+
+type pickfirstBalancer struct {
+	state connectivity.State
+	cc    balancer.ClientConn
+	sc    balancer.SubConn
+}
+
+var _ balancer.V2Balancer = &pickfirstBalancer{} // Assert we implement v2
+
+func (b *pickfirstBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
+	if err != nil {
+		b.ResolverError(err)
+		return
+	}
+	b.UpdateClientConnState(balancer.ClientConnState{ResolverState: resolver.State{Addresses: addrs}}) // Ignore error
+}
+
+func (b *pickfirstBalancer) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
+	b.UpdateSubConnState(sc, balancer.SubConnState{ConnectivityState: s})
+}
+
+func (b *pickfirstBalancer) ResolverError(err error) {
+	switch b.state {
+	case connectivity.TransientFailure, connectivity.Idle, connectivity.Connecting:
+		// Set a failing picker if we don't have a good picker.
+		b.cc.UpdateState(balancer.State{ConnectivityState: connectivity.TransientFailure,
+			Picker: &picker{err: status.Errorf(codes.Unavailable, "name resolver error: %v", err)}},
+		)
+	}
+	if grpclog.V(2) {
+		grpclog.Infof("pickfirstBalancer: ResolverError called with error %v", err)
+	}
+}
+
+func (b *pickfirstBalancer) UpdateClientConnState(cs balancer.ClientConnState) error {
+	if len(cs.ResolverState.Addresses) == 0 {
+		b.ResolverError(errors.New("produced zero addresses"))
+		return balancer.ErrBadResolverState
+	}
+	if b.sc == nil {
+		var err error
+		b.sc, err = b.cc.NewSubConn(cs.ResolverState.Addresses, balancer.NewSubConnOptions{})
+		if err != nil {
+			if grpclog.V(2) {
+				grpclog.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
+			}
+			b.state = connectivity.TransientFailure
+			b.cc.UpdateState(balancer.State{ConnectivityState: connectivity.TransientFailure,
+				Picker: &picker{err: status.Errorf(codes.Unavailable, "error creating connection: %v", err)}},
+			)
+			return balancer.ErrBadResolverState
+		}
+		b.state = connectivity.Idle
+		b.cc.UpdateState(balancer.State{ConnectivityState: connectivity.Idle, Picker: &picker{result: balancer.PickResult{SubConn: b.sc}}})
+		b.sc.Connect()
+	} else {
+		b.sc.UpdateAddresses(cs.ResolverState.Addresses)
+		b.sc.Connect()
+	}
+	return nil
+}
+
+func (b *pickfirstBalancer) UpdateSubConnState(sc balancer.SubConn, s balancer.SubConnState) {
+	if grpclog.V(2) {
+		grpclog.Infof("pickfirstBalancer: HandleSubConnStateChange: %p, %v", sc, s)
+	}
+	if b.sc != sc {
+		if grpclog.V(2) {
+			grpclog.Infof("pickfirstBalancer: ignored state change because sc is not recognized")
+		}
+		return
+	}
+	b.state = s.ConnectivityState
+	if s.ConnectivityState == connectivity.Shutdown {
+		b.sc = nil
+		return
+	}
+
+	switch s.ConnectivityState {
+	case connectivity.Ready, connectivity.Idle:
+		b.cc.UpdateState(balancer.State{ConnectivityState: s.ConnectivityState, Picker: &picker{result: balancer.PickResult{SubConn: sc}}})
+	case connectivity.Connecting:
+		b.cc.UpdateState(balancer.State{ConnectivityState: s.ConnectivityState, Picker: &picker{err: balancer.ErrNoSubConnAvailable}})
+	case connectivity.TransientFailure:
+		err := balancer.ErrTransientFailure
+		// TODO: this can be unconditional after the V1 API is removed, as
+		// SubConnState will always contain a connection error.
+		if s.ConnectionError != nil {
+			err = balancer.TransientFailureError(s.ConnectionError)
+		}
+		b.cc.UpdateState(balancer.State{
+			ConnectivityState: s.ConnectivityState,
+			Picker:            &picker{err: err},
+		})
+	}
+}
+
+func (b *pickfirstBalancer) Close() {
+}
+
+type picker struct {
+	result balancer.PickResult
+	err    error
+}
+
+func (p *picker) Pick(info balancer.PickInfo) (balancer.PickResult, error) {
+	return p.result, p.err
+}
+
+func init() {
+	balancer.Register(newPickfirstBuilder())
+}
diff --git a/vendor/google.golang.org/grpc/preloader.go b/vendor/google.golang.org/grpc/preloader.go
new file mode 100644
index 0000000..76acbbc
--- /dev/null
+++ b/vendor/google.golang.org/grpc/preloader.go
@@ -0,0 +1,64 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// PreparedMsg is responsible for creating a Marshalled and Compressed object.
+//
+// This API is EXPERIMENTAL.
+type PreparedMsg struct {
+	// Struct for preparing msg before sending them
+	encodedData []byte
+	hdr         []byte
+	payload     []byte
+}
+
+// Encode marshalls and compresses the message using the codec and compressor for the stream.
+func (p *PreparedMsg) Encode(s Stream, msg interface{}) error {
+	ctx := s.Context()
+	rpcInfo, ok := rpcInfoFromContext(ctx)
+	if !ok {
+		return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
+	}
+
+	// check if the context has the relevant information to prepareMsg
+	if rpcInfo.preloaderInfo == nil {
+		return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
+	}
+	if rpcInfo.preloaderInfo.codec == nil {
+		return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
+	}
+
+	// prepare the msg
+	data, err := encode(rpcInfo.preloaderInfo.codec, msg)
+	if err != nil {
+		return err
+	}
+	p.encodedData = data
+	compData, err := compress(data, rpcInfo.preloaderInfo.cp, rpcInfo.preloaderInfo.comp)
+	if err != nil {
+		return err
+	}
+	p.hdr, p.payload = msgHeader(data, compData)
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/proxy.go b/vendor/google.golang.org/grpc/proxy.go
new file mode 100644
index 0000000..f8f69bf
--- /dev/null
+++ b/vendor/google.golang.org/grpc/proxy.go
@@ -0,0 +1,152 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"bufio"
+	"context"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+)
+
+const proxyAuthHeaderKey = "Proxy-Authorization"
+
+var (
+	// errDisabled indicates that proxy is disabled for the address.
+	errDisabled = errors.New("proxy is disabled for the address")
+	// The following variable will be overwritten in the tests.
+	httpProxyFromEnvironment = http.ProxyFromEnvironment
+)
+
+func mapAddress(ctx context.Context, address string) (*url.URL, error) {
+	req := &http.Request{
+		URL: &url.URL{
+			Scheme: "https",
+			Host:   address,
+		},
+	}
+	url, err := httpProxyFromEnvironment(req)
+	if err != nil {
+		return nil, err
+	}
+	if url == nil {
+		return nil, errDisabled
+	}
+	return url, nil
+}
+
+// To read a response from a net.Conn, http.ReadResponse() takes a bufio.Reader.
+// It's possible that this reader reads more than what's need for the response and stores
+// those bytes in the buffer.
+// bufConn wraps the original net.Conn and the bufio.Reader to make sure we don't lose the
+// bytes in the buffer.
+type bufConn struct {
+	net.Conn
+	r io.Reader
+}
+
+func (c *bufConn) Read(b []byte) (int, error) {
+	return c.r.Read(b)
+}
+
+func basicAuth(username, password string) string {
+	auth := username + ":" + password
+	return base64.StdEncoding.EncodeToString([]byte(auth))
+}
+
+func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, backendAddr string, proxyURL *url.URL) (_ net.Conn, err error) {
+	defer func() {
+		if err != nil {
+			conn.Close()
+		}
+	}()
+
+	req := &http.Request{
+		Method: http.MethodConnect,
+		URL:    &url.URL{Host: backendAddr},
+		Header: map[string][]string{"User-Agent": {grpcUA}},
+	}
+	if t := proxyURL.User; t != nil {
+		u := t.Username()
+		p, _ := t.Password()
+		req.Header.Add(proxyAuthHeaderKey, "Basic "+basicAuth(u, p))
+	}
+
+	if err := sendHTTPRequest(ctx, req, conn); err != nil {
+		return nil, fmt.Errorf("failed to write the HTTP request: %v", err)
+	}
+
+	r := bufio.NewReader(conn)
+	resp, err := http.ReadResponse(r, req)
+	if err != nil {
+		return nil, fmt.Errorf("reading server HTTP response: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		dump, err := httputil.DumpResponse(resp, true)
+		if err != nil {
+			return nil, fmt.Errorf("failed to do connect handshake, status code: %s", resp.Status)
+		}
+		return nil, fmt.Errorf("failed to do connect handshake, response: %q", dump)
+	}
+
+	return &bufConn{Conn: conn, r: r}, nil
+}
+
+// newProxyDialer returns a dialer that connects to proxy first if necessary.
+// The returned dialer checks if a proxy is necessary, dial to the proxy with the
+// provided dialer, does HTTP CONNECT handshake and returns the connection.
+func newProxyDialer(dialer func(context.Context, string) (net.Conn, error)) func(context.Context, string) (net.Conn, error) {
+	return func(ctx context.Context, addr string) (conn net.Conn, err error) {
+		var newAddr string
+		proxyURL, err := mapAddress(ctx, addr)
+		if err != nil {
+			if err != errDisabled {
+				return nil, err
+			}
+			newAddr = addr
+		} else {
+			newAddr = proxyURL.Host
+		}
+
+		conn, err = dialer(ctx, newAddr)
+		if err != nil {
+			return
+		}
+		if proxyURL != nil {
+			// proxy is disabled if proxyURL is nil.
+			conn, err = doHTTPConnectHandshake(ctx, conn, addr, proxyURL)
+		}
+		return
+	}
+}
+
+func sendHTTPRequest(ctx context.Context, req *http.Request, conn net.Conn) error {
+	req = req.WithContext(ctx)
+	if err := req.Write(conn); err != nil {
+		return fmt.Errorf("failed to write the HTTP request: %v", err)
+	}
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/reflection/README.md b/vendor/google.golang.org/grpc/reflection/README.md
new file mode 100644
index 0000000..04b6371
--- /dev/null
+++ b/vendor/google.golang.org/grpc/reflection/README.md
@@ -0,0 +1,18 @@
+# Reflection
+
+Package reflection implements server reflection service.
+
+The service implemented is defined in: https://github.com/grpc/grpc/blob/master/src/proto/grpc/reflection/v1alpha/reflection.proto.
+
+To register server reflection on a gRPC server:
+```go
+import "google.golang.org/grpc/reflection"
+
+s := grpc.NewServer()
+pb.RegisterYourOwnServer(s, &server{})
+
+// Register reflection service on gRPC server.
+reflection.Register(s)
+
+s.Serve(lis)
+```
diff --git a/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.pb.go b/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.pb.go
new file mode 100644
index 0000000..0a12ad2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.pb.go
@@ -0,0 +1,750 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: grpc_reflection_v1alpha/reflection.proto
+
+package grpc_reflection_v1alpha
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// The message sent by the client when calling ServerReflectionInfo method.
+type ServerReflectionRequest struct {
+	Host string `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"`
+	// To use reflection service, the client should set one of the following
+	// fields in message_request. The server distinguishes requests by their
+	// defined field and then handles them using corresponding methods.
+	//
+	// Types that are valid to be assigned to MessageRequest:
+	//	*ServerReflectionRequest_FileByFilename
+	//	*ServerReflectionRequest_FileContainingSymbol
+	//	*ServerReflectionRequest_FileContainingExtension
+	//	*ServerReflectionRequest_AllExtensionNumbersOfType
+	//	*ServerReflectionRequest_ListServices
+	MessageRequest       isServerReflectionRequest_MessageRequest `protobuf_oneof:"message_request"`
+	XXX_NoUnkeyedLiteral struct{}                                 `json:"-"`
+	XXX_unrecognized     []byte                                   `json:"-"`
+	XXX_sizecache        int32                                    `json:"-"`
+}
+
+func (m *ServerReflectionRequest) Reset()         { *m = ServerReflectionRequest{} }
+func (m *ServerReflectionRequest) String() string { return proto.CompactTextString(m) }
+func (*ServerReflectionRequest) ProtoMessage()    {}
+func (*ServerReflectionRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{0}
+}
+
+func (m *ServerReflectionRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServerReflectionRequest.Unmarshal(m, b)
+}
+func (m *ServerReflectionRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServerReflectionRequest.Marshal(b, m, deterministic)
+}
+func (m *ServerReflectionRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServerReflectionRequest.Merge(m, src)
+}
+func (m *ServerReflectionRequest) XXX_Size() int {
+	return xxx_messageInfo_ServerReflectionRequest.Size(m)
+}
+func (m *ServerReflectionRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServerReflectionRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServerReflectionRequest proto.InternalMessageInfo
+
+func (m *ServerReflectionRequest) GetHost() string {
+	if m != nil {
+		return m.Host
+	}
+	return ""
+}
+
+type isServerReflectionRequest_MessageRequest interface {
+	isServerReflectionRequest_MessageRequest()
+}
+
+type ServerReflectionRequest_FileByFilename struct {
+	FileByFilename string `protobuf:"bytes,3,opt,name=file_by_filename,json=fileByFilename,proto3,oneof"`
+}
+
+type ServerReflectionRequest_FileContainingSymbol struct {
+	FileContainingSymbol string `protobuf:"bytes,4,opt,name=file_containing_symbol,json=fileContainingSymbol,proto3,oneof"`
+}
+
+type ServerReflectionRequest_FileContainingExtension struct {
+	FileContainingExtension *ExtensionRequest `protobuf:"bytes,5,opt,name=file_containing_extension,json=fileContainingExtension,proto3,oneof"`
+}
+
+type ServerReflectionRequest_AllExtensionNumbersOfType struct {
+	AllExtensionNumbersOfType string `protobuf:"bytes,6,opt,name=all_extension_numbers_of_type,json=allExtensionNumbersOfType,proto3,oneof"`
+}
+
+type ServerReflectionRequest_ListServices struct {
+	ListServices string `protobuf:"bytes,7,opt,name=list_services,json=listServices,proto3,oneof"`
+}
+
+func (*ServerReflectionRequest_FileByFilename) isServerReflectionRequest_MessageRequest() {}
+
+func (*ServerReflectionRequest_FileContainingSymbol) isServerReflectionRequest_MessageRequest() {}
+
+func (*ServerReflectionRequest_FileContainingExtension) isServerReflectionRequest_MessageRequest() {}
+
+func (*ServerReflectionRequest_AllExtensionNumbersOfType) isServerReflectionRequest_MessageRequest() {}
+
+func (*ServerReflectionRequest_ListServices) isServerReflectionRequest_MessageRequest() {}
+
+func (m *ServerReflectionRequest) GetMessageRequest() isServerReflectionRequest_MessageRequest {
+	if m != nil {
+		return m.MessageRequest
+	}
+	return nil
+}
+
+func (m *ServerReflectionRequest) GetFileByFilename() string {
+	if x, ok := m.GetMessageRequest().(*ServerReflectionRequest_FileByFilename); ok {
+		return x.FileByFilename
+	}
+	return ""
+}
+
+func (m *ServerReflectionRequest) GetFileContainingSymbol() string {
+	if x, ok := m.GetMessageRequest().(*ServerReflectionRequest_FileContainingSymbol); ok {
+		return x.FileContainingSymbol
+	}
+	return ""
+}
+
+func (m *ServerReflectionRequest) GetFileContainingExtension() *ExtensionRequest {
+	if x, ok := m.GetMessageRequest().(*ServerReflectionRequest_FileContainingExtension); ok {
+		return x.FileContainingExtension
+	}
+	return nil
+}
+
+func (m *ServerReflectionRequest) GetAllExtensionNumbersOfType() string {
+	if x, ok := m.GetMessageRequest().(*ServerReflectionRequest_AllExtensionNumbersOfType); ok {
+		return x.AllExtensionNumbersOfType
+	}
+	return ""
+}
+
+func (m *ServerReflectionRequest) GetListServices() string {
+	if x, ok := m.GetMessageRequest().(*ServerReflectionRequest_ListServices); ok {
+		return x.ListServices
+	}
+	return ""
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*ServerReflectionRequest) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*ServerReflectionRequest_FileByFilename)(nil),
+		(*ServerReflectionRequest_FileContainingSymbol)(nil),
+		(*ServerReflectionRequest_FileContainingExtension)(nil),
+		(*ServerReflectionRequest_AllExtensionNumbersOfType)(nil),
+		(*ServerReflectionRequest_ListServices)(nil),
+	}
+}
+
+// The type name and extension number sent by the client when requesting
+// file_containing_extension.
+type ExtensionRequest struct {
+	// Fully-qualified type name. The format should be <package>.<type>
+	ContainingType       string   `protobuf:"bytes,1,opt,name=containing_type,json=containingType,proto3" json:"containing_type,omitempty"`
+	ExtensionNumber      int32    `protobuf:"varint,2,opt,name=extension_number,json=extensionNumber,proto3" json:"extension_number,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ExtensionRequest) Reset()         { *m = ExtensionRequest{} }
+func (m *ExtensionRequest) String() string { return proto.CompactTextString(m) }
+func (*ExtensionRequest) ProtoMessage()    {}
+func (*ExtensionRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{1}
+}
+
+func (m *ExtensionRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ExtensionRequest.Unmarshal(m, b)
+}
+func (m *ExtensionRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ExtensionRequest.Marshal(b, m, deterministic)
+}
+func (m *ExtensionRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ExtensionRequest.Merge(m, src)
+}
+func (m *ExtensionRequest) XXX_Size() int {
+	return xxx_messageInfo_ExtensionRequest.Size(m)
+}
+func (m *ExtensionRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_ExtensionRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ExtensionRequest proto.InternalMessageInfo
+
+func (m *ExtensionRequest) GetContainingType() string {
+	if m != nil {
+		return m.ContainingType
+	}
+	return ""
+}
+
+func (m *ExtensionRequest) GetExtensionNumber() int32 {
+	if m != nil {
+		return m.ExtensionNumber
+	}
+	return 0
+}
+
+// The message sent by the server to answer ServerReflectionInfo method.
+type ServerReflectionResponse struct {
+	ValidHost       string                   `protobuf:"bytes,1,opt,name=valid_host,json=validHost,proto3" json:"valid_host,omitempty"`
+	OriginalRequest *ServerReflectionRequest `protobuf:"bytes,2,opt,name=original_request,json=originalRequest,proto3" json:"original_request,omitempty"`
+	// The server sets one of the following fields according to the
+	// message_request in the request.
+	//
+	// Types that are valid to be assigned to MessageResponse:
+	//	*ServerReflectionResponse_FileDescriptorResponse
+	//	*ServerReflectionResponse_AllExtensionNumbersResponse
+	//	*ServerReflectionResponse_ListServicesResponse
+	//	*ServerReflectionResponse_ErrorResponse
+	MessageResponse      isServerReflectionResponse_MessageResponse `protobuf_oneof:"message_response"`
+	XXX_NoUnkeyedLiteral struct{}                                   `json:"-"`
+	XXX_unrecognized     []byte                                     `json:"-"`
+	XXX_sizecache        int32                                      `json:"-"`
+}
+
+func (m *ServerReflectionResponse) Reset()         { *m = ServerReflectionResponse{} }
+func (m *ServerReflectionResponse) String() string { return proto.CompactTextString(m) }
+func (*ServerReflectionResponse) ProtoMessage()    {}
+func (*ServerReflectionResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{2}
+}
+
+func (m *ServerReflectionResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServerReflectionResponse.Unmarshal(m, b)
+}
+func (m *ServerReflectionResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServerReflectionResponse.Marshal(b, m, deterministic)
+}
+func (m *ServerReflectionResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServerReflectionResponse.Merge(m, src)
+}
+func (m *ServerReflectionResponse) XXX_Size() int {
+	return xxx_messageInfo_ServerReflectionResponse.Size(m)
+}
+func (m *ServerReflectionResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServerReflectionResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServerReflectionResponse proto.InternalMessageInfo
+
+func (m *ServerReflectionResponse) GetValidHost() string {
+	if m != nil {
+		return m.ValidHost
+	}
+	return ""
+}
+
+func (m *ServerReflectionResponse) GetOriginalRequest() *ServerReflectionRequest {
+	if m != nil {
+		return m.OriginalRequest
+	}
+	return nil
+}
+
+type isServerReflectionResponse_MessageResponse interface {
+	isServerReflectionResponse_MessageResponse()
+}
+
+type ServerReflectionResponse_FileDescriptorResponse struct {
+	FileDescriptorResponse *FileDescriptorResponse `protobuf:"bytes,4,opt,name=file_descriptor_response,json=fileDescriptorResponse,proto3,oneof"`
+}
+
+type ServerReflectionResponse_AllExtensionNumbersResponse struct {
+	AllExtensionNumbersResponse *ExtensionNumberResponse `protobuf:"bytes,5,opt,name=all_extension_numbers_response,json=allExtensionNumbersResponse,proto3,oneof"`
+}
+
+type ServerReflectionResponse_ListServicesResponse struct {
+	ListServicesResponse *ListServiceResponse `protobuf:"bytes,6,opt,name=list_services_response,json=listServicesResponse,proto3,oneof"`
+}
+
+type ServerReflectionResponse_ErrorResponse struct {
+	ErrorResponse *ErrorResponse `protobuf:"bytes,7,opt,name=error_response,json=errorResponse,proto3,oneof"`
+}
+
+func (*ServerReflectionResponse_FileDescriptorResponse) isServerReflectionResponse_MessageResponse() {}
+
+func (*ServerReflectionResponse_AllExtensionNumbersResponse) isServerReflectionResponse_MessageResponse() {
+}
+
+func (*ServerReflectionResponse_ListServicesResponse) isServerReflectionResponse_MessageResponse() {}
+
+func (*ServerReflectionResponse_ErrorResponse) isServerReflectionResponse_MessageResponse() {}
+
+func (m *ServerReflectionResponse) GetMessageResponse() isServerReflectionResponse_MessageResponse {
+	if m != nil {
+		return m.MessageResponse
+	}
+	return nil
+}
+
+func (m *ServerReflectionResponse) GetFileDescriptorResponse() *FileDescriptorResponse {
+	if x, ok := m.GetMessageResponse().(*ServerReflectionResponse_FileDescriptorResponse); ok {
+		return x.FileDescriptorResponse
+	}
+	return nil
+}
+
+func (m *ServerReflectionResponse) GetAllExtensionNumbersResponse() *ExtensionNumberResponse {
+	if x, ok := m.GetMessageResponse().(*ServerReflectionResponse_AllExtensionNumbersResponse); ok {
+		return x.AllExtensionNumbersResponse
+	}
+	return nil
+}
+
+func (m *ServerReflectionResponse) GetListServicesResponse() *ListServiceResponse {
+	if x, ok := m.GetMessageResponse().(*ServerReflectionResponse_ListServicesResponse); ok {
+		return x.ListServicesResponse
+	}
+	return nil
+}
+
+func (m *ServerReflectionResponse) GetErrorResponse() *ErrorResponse {
+	if x, ok := m.GetMessageResponse().(*ServerReflectionResponse_ErrorResponse); ok {
+		return x.ErrorResponse
+	}
+	return nil
+}
+
+// XXX_OneofWrappers is for the internal use of the proto package.
+func (*ServerReflectionResponse) XXX_OneofWrappers() []interface{} {
+	return []interface{}{
+		(*ServerReflectionResponse_FileDescriptorResponse)(nil),
+		(*ServerReflectionResponse_AllExtensionNumbersResponse)(nil),
+		(*ServerReflectionResponse_ListServicesResponse)(nil),
+		(*ServerReflectionResponse_ErrorResponse)(nil),
+	}
+}
+
+// Serialized FileDescriptorProto messages sent by the server answering
+// a file_by_filename, file_containing_symbol, or file_containing_extension
+// request.
+type FileDescriptorResponse struct {
+	// Serialized FileDescriptorProto messages. We avoid taking a dependency on
+	// descriptor.proto, which uses proto2 only features, by making them opaque
+	// bytes instead.
+	FileDescriptorProto  [][]byte `protobuf:"bytes,1,rep,name=file_descriptor_proto,json=fileDescriptorProto,proto3" json:"file_descriptor_proto,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *FileDescriptorResponse) Reset()         { *m = FileDescriptorResponse{} }
+func (m *FileDescriptorResponse) String() string { return proto.CompactTextString(m) }
+func (*FileDescriptorResponse) ProtoMessage()    {}
+func (*FileDescriptorResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{3}
+}
+
+func (m *FileDescriptorResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FileDescriptorResponse.Unmarshal(m, b)
+}
+func (m *FileDescriptorResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FileDescriptorResponse.Marshal(b, m, deterministic)
+}
+func (m *FileDescriptorResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FileDescriptorResponse.Merge(m, src)
+}
+func (m *FileDescriptorResponse) XXX_Size() int {
+	return xxx_messageInfo_FileDescriptorResponse.Size(m)
+}
+func (m *FileDescriptorResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_FileDescriptorResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FileDescriptorResponse proto.InternalMessageInfo
+
+func (m *FileDescriptorResponse) GetFileDescriptorProto() [][]byte {
+	if m != nil {
+		return m.FileDescriptorProto
+	}
+	return nil
+}
+
+// A list of extension numbers sent by the server answering
+// all_extension_numbers_of_type request.
+type ExtensionNumberResponse struct {
+	// Full name of the base type, including the package name. The format
+	// is <package>.<type>
+	BaseTypeName         string   `protobuf:"bytes,1,opt,name=base_type_name,json=baseTypeName,proto3" json:"base_type_name,omitempty"`
+	ExtensionNumber      []int32  `protobuf:"varint,2,rep,packed,name=extension_number,json=extensionNumber,proto3" json:"extension_number,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ExtensionNumberResponse) Reset()         { *m = ExtensionNumberResponse{} }
+func (m *ExtensionNumberResponse) String() string { return proto.CompactTextString(m) }
+func (*ExtensionNumberResponse) ProtoMessage()    {}
+func (*ExtensionNumberResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{4}
+}
+
+func (m *ExtensionNumberResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ExtensionNumberResponse.Unmarshal(m, b)
+}
+func (m *ExtensionNumberResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ExtensionNumberResponse.Marshal(b, m, deterministic)
+}
+func (m *ExtensionNumberResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ExtensionNumberResponse.Merge(m, src)
+}
+func (m *ExtensionNumberResponse) XXX_Size() int {
+	return xxx_messageInfo_ExtensionNumberResponse.Size(m)
+}
+func (m *ExtensionNumberResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ExtensionNumberResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ExtensionNumberResponse proto.InternalMessageInfo
+
+func (m *ExtensionNumberResponse) GetBaseTypeName() string {
+	if m != nil {
+		return m.BaseTypeName
+	}
+	return ""
+}
+
+func (m *ExtensionNumberResponse) GetExtensionNumber() []int32 {
+	if m != nil {
+		return m.ExtensionNumber
+	}
+	return nil
+}
+
+// A list of ServiceResponse sent by the server answering list_services request.
+type ListServiceResponse struct {
+	// The information of each service may be expanded in the future, so we use
+	// ServiceResponse message to encapsulate it.
+	Service              []*ServiceResponse `protobuf:"bytes,1,rep,name=service,proto3" json:"service,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
+}
+
+func (m *ListServiceResponse) Reset()         { *m = ListServiceResponse{} }
+func (m *ListServiceResponse) String() string { return proto.CompactTextString(m) }
+func (*ListServiceResponse) ProtoMessage()    {}
+func (*ListServiceResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{5}
+}
+
+func (m *ListServiceResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ListServiceResponse.Unmarshal(m, b)
+}
+func (m *ListServiceResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ListServiceResponse.Marshal(b, m, deterministic)
+}
+func (m *ListServiceResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ListServiceResponse.Merge(m, src)
+}
+func (m *ListServiceResponse) XXX_Size() int {
+	return xxx_messageInfo_ListServiceResponse.Size(m)
+}
+func (m *ListServiceResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ListServiceResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ListServiceResponse proto.InternalMessageInfo
+
+func (m *ListServiceResponse) GetService() []*ServiceResponse {
+	if m != nil {
+		return m.Service
+	}
+	return nil
+}
+
+// The information of a single service used by ListServiceResponse to answer
+// list_services request.
+type ServiceResponse struct {
+	// Full name of a registered service, including its package name. The format
+	// is <package>.<service>
+	Name                 string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ServiceResponse) Reset()         { *m = ServiceResponse{} }
+func (m *ServiceResponse) String() string { return proto.CompactTextString(m) }
+func (*ServiceResponse) ProtoMessage()    {}
+func (*ServiceResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{6}
+}
+
+func (m *ServiceResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ServiceResponse.Unmarshal(m, b)
+}
+func (m *ServiceResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ServiceResponse.Marshal(b, m, deterministic)
+}
+func (m *ServiceResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ServiceResponse.Merge(m, src)
+}
+func (m *ServiceResponse) XXX_Size() int {
+	return xxx_messageInfo_ServiceResponse.Size(m)
+}
+func (m *ServiceResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ServiceResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ServiceResponse proto.InternalMessageInfo
+
+func (m *ServiceResponse) GetName() string {
+	if m != nil {
+		return m.Name
+	}
+	return ""
+}
+
+// The error code and error message sent by the server when an error occurs.
+type ErrorResponse struct {
+	// This field uses the error codes defined in grpc::StatusCode.
+	ErrorCode            int32    `protobuf:"varint,1,opt,name=error_code,json=errorCode,proto3" json:"error_code,omitempty"`
+	ErrorMessage         string   `protobuf:"bytes,2,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ErrorResponse) Reset()         { *m = ErrorResponse{} }
+func (m *ErrorResponse) String() string { return proto.CompactTextString(m) }
+func (*ErrorResponse) ProtoMessage()    {}
+func (*ErrorResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_42a8ac412db3cb03, []int{7}
+}
+
+func (m *ErrorResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ErrorResponse.Unmarshal(m, b)
+}
+func (m *ErrorResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ErrorResponse.Marshal(b, m, deterministic)
+}
+func (m *ErrorResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ErrorResponse.Merge(m, src)
+}
+func (m *ErrorResponse) XXX_Size() int {
+	return xxx_messageInfo_ErrorResponse.Size(m)
+}
+func (m *ErrorResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_ErrorResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ErrorResponse proto.InternalMessageInfo
+
+func (m *ErrorResponse) GetErrorCode() int32 {
+	if m != nil {
+		return m.ErrorCode
+	}
+	return 0
+}
+
+func (m *ErrorResponse) GetErrorMessage() string {
+	if m != nil {
+		return m.ErrorMessage
+	}
+	return ""
+}
+
+func init() {
+	proto.RegisterType((*ServerReflectionRequest)(nil), "grpc.reflection.v1alpha.ServerReflectionRequest")
+	proto.RegisterType((*ExtensionRequest)(nil), "grpc.reflection.v1alpha.ExtensionRequest")
+	proto.RegisterType((*ServerReflectionResponse)(nil), "grpc.reflection.v1alpha.ServerReflectionResponse")
+	proto.RegisterType((*FileDescriptorResponse)(nil), "grpc.reflection.v1alpha.FileDescriptorResponse")
+	proto.RegisterType((*ExtensionNumberResponse)(nil), "grpc.reflection.v1alpha.ExtensionNumberResponse")
+	proto.RegisterType((*ListServiceResponse)(nil), "grpc.reflection.v1alpha.ListServiceResponse")
+	proto.RegisterType((*ServiceResponse)(nil), "grpc.reflection.v1alpha.ServiceResponse")
+	proto.RegisterType((*ErrorResponse)(nil), "grpc.reflection.v1alpha.ErrorResponse")
+}
+
+func init() {
+	proto.RegisterFile("grpc_reflection_v1alpha/reflection.proto", fileDescriptor_42a8ac412db3cb03)
+}
+
+var fileDescriptor_42a8ac412db3cb03 = []byte{
+	// 656 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x54, 0x51, 0x73, 0xd2, 0x40,
+	0x10, 0x6e, 0x5a, 0x68, 0x87, 0x85, 0x02, 0x5e, 0x2b, 0xa4, 0x3a, 0x75, 0x98, 0x68, 0x35, 0x75,
+	0x1c, 0xda, 0xe2, 0x8c, 0x3f, 0x80, 0xaa, 0x83, 0x33, 0xb5, 0x75, 0x0e, 0x5f, 0x1c, 0x1f, 0x6e,
+	0x02, 0x2c, 0x34, 0x1a, 0x72, 0xf1, 0x2e, 0x45, 0x79, 0xf2, 0x47, 0xf8, 0xa3, 0xfc, 0x4b, 0x3e,
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+	0x6a, 0x53, 0x94, 0xd2, 0x99, 0x20, 0x13, 0x51, 0x63, 0xd6, 0x18, 0xea, 0xd9, 0x66, 0xc9, 0x33,
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+	0x06, 0xdc, 0x97, 0x48, 0x0e, 0x01, 0x66, 0x8e, 0xe7, 0x8e, 0x58, 0x4a, 0xe9, 0x92, 0x46, 0x7a,
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+	0x51, 0x26, 0x7b, 0x9d, 0xd4, 0x2d, 0xc6, 0xe9, 0x6d, 0x50, 0x6d, 0xb9, 0xdb, 0x11, 0xf2, 0x1d,
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+	0x23, 0x21, 0x1e, 0x41, 0x63, 0xc5, 0x20, 0x4b, 0xc2, 0x6d, 0x4d, 0xf8, 0x22, 0x97, 0xf0, 0x62,
+	0x69, 0xa0, 0x14, 0xd9, 0x7e, 0xda, 0x57, 0x09, 0xcb, 0x15, 0x54, 0x51, 0x88, 0xf4, 0x06, 0x77,
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+	0x98, 0x46, 0x6b, 0xcb, 0xae, 0xd0, 0xbd, 0x55, 0x51, 0x3e, 0xa8, 0x90, 0xf5, 0x05, 0x9a, 0x39,
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+	0x50, 0xe5, 0xff, 0x4b, 0xf5, 0x7d, 0x59, 0x7f, 0x03, 0x5b, 0xeb, 0x6e, 0xe0, 0x13, 0xec, 0xad,
+	0xd9, 0x26, 0xe9, 0xc2, 0x4e, 0x2c, 0x8b, 0x6e, 0xb4, 0xdc, 0xb1, 0xff, 0xe9, 0xea, 0x54, 0x29,
+	0x5d, 0x14, 0x5a, 0x47, 0x50, 0xcb, 0x3e, 0x4b, 0xa0, 0x90, 0x6a, 0x5a, 0xff, 0xb7, 0xfa, 0xb0,
+	0xbb, 0xb2, 0x71, 0x75, 0x79, 0x91, 0x62, 0x43, 0x3e, 0x8a, 0x52, 0x8b, 0xb4, 0xa4, 0x91, 0x73,
+	0x3e, 0x42, 0xf2, 0x18, 0x22, 0x41, 0x58, 0xac, 0x82, 0x3e, 0xbb, 0x12, 0xad, 0x68, 0xf0, 0x7d,
+	0x84, 0x75, 0x7e, 0x19, 0x50, 0xcf, 0x9e, 0x1b, 0xf9, 0x09, 0xfb, 0x59, 0xec, 0x9d, 0x3f, 0xe6,
+	0xe4, 0xce, 0x17, 0xfb, 0xe0, 0xec, 0x0e, 0x15, 0xd1, 0x54, 0xb6, 0x71, 0x6a, 0x0c, 0xb6, 0xb5,
+	0xf4, 0x2f, 0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0x85, 0x02, 0x09, 0x9d, 0x9f, 0x06, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// ServerReflectionClient is the client API for ServerReflection service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type ServerReflectionClient interface {
+	// The reflection service is structured as a bidirectional stream, ensuring
+	// all related requests go to a single server.
+	ServerReflectionInfo(ctx context.Context, opts ...grpc.CallOption) (ServerReflection_ServerReflectionInfoClient, error)
+}
+
+type serverReflectionClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewServerReflectionClient(cc *grpc.ClientConn) ServerReflectionClient {
+	return &serverReflectionClient{cc}
+}
+
+func (c *serverReflectionClient) ServerReflectionInfo(ctx context.Context, opts ...grpc.CallOption) (ServerReflection_ServerReflectionInfoClient, error) {
+	stream, err := c.cc.NewStream(ctx, &_ServerReflection_serviceDesc.Streams[0], "/grpc.reflection.v1alpha.ServerReflection/ServerReflectionInfo", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &serverReflectionServerReflectionInfoClient{stream}
+	return x, nil
+}
+
+type ServerReflection_ServerReflectionInfoClient interface {
+	Send(*ServerReflectionRequest) error
+	Recv() (*ServerReflectionResponse, error)
+	grpc.ClientStream
+}
+
+type serverReflectionServerReflectionInfoClient struct {
+	grpc.ClientStream
+}
+
+func (x *serverReflectionServerReflectionInfoClient) Send(m *ServerReflectionRequest) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *serverReflectionServerReflectionInfoClient) Recv() (*ServerReflectionResponse, error) {
+	m := new(ServerReflectionResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// ServerReflectionServer is the server API for ServerReflection service.
+type ServerReflectionServer interface {
+	// The reflection service is structured as a bidirectional stream, ensuring
+	// all related requests go to a single server.
+	ServerReflectionInfo(ServerReflection_ServerReflectionInfoServer) error
+}
+
+// UnimplementedServerReflectionServer can be embedded to have forward compatible implementations.
+type UnimplementedServerReflectionServer struct {
+}
+
+func (*UnimplementedServerReflectionServer) ServerReflectionInfo(srv ServerReflection_ServerReflectionInfoServer) error {
+	return status.Errorf(codes.Unimplemented, "method ServerReflectionInfo not implemented")
+}
+
+func RegisterServerReflectionServer(s *grpc.Server, srv ServerReflectionServer) {
+	s.RegisterService(&_ServerReflection_serviceDesc, srv)
+}
+
+func _ServerReflection_ServerReflectionInfo_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(ServerReflectionServer).ServerReflectionInfo(&serverReflectionServerReflectionInfoServer{stream})
+}
+
+type ServerReflection_ServerReflectionInfoServer interface {
+	Send(*ServerReflectionResponse) error
+	Recv() (*ServerReflectionRequest, error)
+	grpc.ServerStream
+}
+
+type serverReflectionServerReflectionInfoServer struct {
+	grpc.ServerStream
+}
+
+func (x *serverReflectionServerReflectionInfoServer) Send(m *ServerReflectionResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *serverReflectionServerReflectionInfoServer) Recv() (*ServerReflectionRequest, error) {
+	m := new(ServerReflectionRequest)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+var _ServerReflection_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "grpc.reflection.v1alpha.ServerReflection",
+	HandlerType: (*ServerReflectionServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "ServerReflectionInfo",
+			Handler:       _ServerReflection_ServerReflectionInfo_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "grpc_reflection_v1alpha/reflection.proto",
+}
diff --git a/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.proto b/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.proto
new file mode 100644
index 0000000..99b00df
--- /dev/null
+++ b/vendor/google.golang.org/grpc/reflection/grpc_reflection_v1alpha/reflection.proto
@@ -0,0 +1,136 @@
+// Copyright 2016 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Service exported by server reflection
+
+syntax = "proto3";
+
+package grpc.reflection.v1alpha;
+
+service ServerReflection {
+  // The reflection service is structured as a bidirectional stream, ensuring
+  // all related requests go to a single server.
+  rpc ServerReflectionInfo(stream ServerReflectionRequest)
+      returns (stream ServerReflectionResponse);
+}
+
+// The message sent by the client when calling ServerReflectionInfo method.
+message ServerReflectionRequest {
+  string host = 1;
+  // To use reflection service, the client should set one of the following
+  // fields in message_request. The server distinguishes requests by their
+  // defined field and then handles them using corresponding methods.
+  oneof message_request {
+    // Find a proto file by the file name.
+    string file_by_filename = 3;
+
+    // Find the proto file that declares the given fully-qualified symbol name.
+    // This field should be a fully-qualified symbol name
+    // (e.g. <package>.<service>[.<method>] or <package>.<type>).
+    string file_containing_symbol = 4;
+
+    // Find the proto file which defines an extension extending the given
+    // message type with the given field number.
+    ExtensionRequest file_containing_extension = 5;
+
+    // Finds the tag numbers used by all known extensions of extendee_type, and
+    // appends them to ExtensionNumberResponse in an undefined order.
+    // Its corresponding method is best-effort: it's not guaranteed that the
+    // reflection service will implement this method, and it's not guaranteed
+    // that this method will provide all extensions. Returns
+    // StatusCode::UNIMPLEMENTED if it's not implemented.
+    // This field should be a fully-qualified type name. The format is
+    // <package>.<type>
+    string all_extension_numbers_of_type = 6;
+
+    // List the full names of registered services. The content will not be
+    // checked.
+    string list_services = 7;
+  }
+}
+
+// The type name and extension number sent by the client when requesting
+// file_containing_extension.
+message ExtensionRequest {
+  // Fully-qualified type name. The format should be <package>.<type>
+  string containing_type = 1;
+  int32 extension_number = 2;
+}
+
+// The message sent by the server to answer ServerReflectionInfo method.
+message ServerReflectionResponse {
+  string valid_host = 1;
+  ServerReflectionRequest original_request = 2;
+  // The server sets one of the following fields according to the
+  // message_request in the request.
+  oneof message_response {
+    // This message is used to answer file_by_filename, file_containing_symbol,
+    // file_containing_extension requests with transitive dependencies.
+    // As the repeated label is not allowed in oneof fields, we use a
+    // FileDescriptorResponse message to encapsulate the repeated fields.
+    // The reflection service is allowed to avoid sending FileDescriptorProtos
+    // that were previously sent in response to earlier requests in the stream.
+    FileDescriptorResponse file_descriptor_response = 4;
+
+    // This message is used to answer all_extension_numbers_of_type requests.
+    ExtensionNumberResponse all_extension_numbers_response = 5;
+
+    // This message is used to answer list_services requests.
+    ListServiceResponse list_services_response = 6;
+
+    // This message is used when an error occurs.
+    ErrorResponse error_response = 7;
+  }
+}
+
+// Serialized FileDescriptorProto messages sent by the server answering
+// a file_by_filename, file_containing_symbol, or file_containing_extension
+// request.
+message FileDescriptorResponse {
+  // Serialized FileDescriptorProto messages. We avoid taking a dependency on
+  // descriptor.proto, which uses proto2 only features, by making them opaque
+  // bytes instead.
+  repeated bytes file_descriptor_proto = 1;
+}
+
+// A list of extension numbers sent by the server answering
+// all_extension_numbers_of_type request.
+message ExtensionNumberResponse {
+  // Full name of the base type, including the package name. The format
+  // is <package>.<type>
+  string base_type_name = 1;
+  repeated int32 extension_number = 2;
+}
+
+// A list of ServiceResponse sent by the server answering list_services request.
+message ListServiceResponse {
+  // The information of each service may be expanded in the future, so we use
+  // ServiceResponse message to encapsulate it.
+  repeated ServiceResponse service = 1;
+}
+
+// The information of a single service used by ListServiceResponse to answer
+// list_services request.
+message ServiceResponse {
+  // Full name of a registered service, including its package name. The format
+  // is <package>.<service>
+  string name = 1;
+}
+
+// The error code and error message sent by the server when an error occurs.
+message ErrorResponse {
+  // This field uses the error codes defined in grpc::StatusCode.
+  int32 error_code = 1;
+  string error_message = 2;
+}
diff --git a/vendor/google.golang.org/grpc/reflection/serverreflection.go b/vendor/google.golang.org/grpc/reflection/serverreflection.go
new file mode 100644
index 0000000..dd22a2d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/reflection/serverreflection.go
@@ -0,0 +1,454 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+//go:generate protoc --go_out=plugins=grpc:. grpc_reflection_v1alpha/reflection.proto
+
+/*
+Package reflection implements server reflection service.
+
+The service implemented is defined in:
+https://github.com/grpc/grpc/blob/master/src/proto/grpc/reflection/v1alpha/reflection.proto.
+
+To register server reflection on a gRPC server:
+	import "google.golang.org/grpc/reflection"
+
+	s := grpc.NewServer()
+	pb.RegisterYourOwnServer(s, &server{})
+
+	// Register reflection service on gRPC server.
+	reflection.Register(s)
+
+	s.Serve(lis)
+
+*/
+package reflection // import "google.golang.org/grpc/reflection"
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"reflect"
+	"sort"
+	"sync"
+
+	"github.com/golang/protobuf/proto"
+	dpb "github.com/golang/protobuf/protoc-gen-go/descriptor"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	rpb "google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
+	"google.golang.org/grpc/status"
+)
+
+type serverReflectionServer struct {
+	s *grpc.Server
+
+	initSymbols  sync.Once
+	serviceNames []string
+	symbols      map[string]*dpb.FileDescriptorProto // map of fully-qualified names to files
+}
+
+// Register registers the server reflection service on the given gRPC server.
+func Register(s *grpc.Server) {
+	rpb.RegisterServerReflectionServer(s, &serverReflectionServer{
+		s: s,
+	})
+}
+
+// protoMessage is used for type assertion on proto messages.
+// Generated proto message implements function Descriptor(), but Descriptor()
+// is not part of interface proto.Message. This interface is needed to
+// call Descriptor().
+type protoMessage interface {
+	Descriptor() ([]byte, []int)
+}
+
+func (s *serverReflectionServer) getSymbols() (svcNames []string, symbolIndex map[string]*dpb.FileDescriptorProto) {
+	s.initSymbols.Do(func() {
+		serviceInfo := s.s.GetServiceInfo()
+
+		s.symbols = map[string]*dpb.FileDescriptorProto{}
+		s.serviceNames = make([]string, 0, len(serviceInfo))
+		processed := map[string]struct{}{}
+		for svc, info := range serviceInfo {
+			s.serviceNames = append(s.serviceNames, svc)
+			fdenc, ok := parseMetadata(info.Metadata)
+			if !ok {
+				continue
+			}
+			fd, err := decodeFileDesc(fdenc)
+			if err != nil {
+				continue
+			}
+			s.processFile(fd, processed)
+		}
+		sort.Strings(s.serviceNames)
+	})
+
+	return s.serviceNames, s.symbols
+}
+
+func (s *serverReflectionServer) processFile(fd *dpb.FileDescriptorProto, processed map[string]struct{}) {
+	filename := fd.GetName()
+	if _, ok := processed[filename]; ok {
+		return
+	}
+	processed[filename] = struct{}{}
+
+	prefix := fd.GetPackage()
+
+	for _, msg := range fd.MessageType {
+		s.processMessage(fd, prefix, msg)
+	}
+	for _, en := range fd.EnumType {
+		s.processEnum(fd, prefix, en)
+	}
+	for _, ext := range fd.Extension {
+		s.processField(fd, prefix, ext)
+	}
+	for _, svc := range fd.Service {
+		svcName := fqn(prefix, svc.GetName())
+		s.symbols[svcName] = fd
+		for _, meth := range svc.Method {
+			name := fqn(svcName, meth.GetName())
+			s.symbols[name] = fd
+		}
+	}
+
+	for _, dep := range fd.Dependency {
+		fdenc := proto.FileDescriptor(dep)
+		fdDep, err := decodeFileDesc(fdenc)
+		if err != nil {
+			continue
+		}
+		s.processFile(fdDep, processed)
+	}
+}
+
+func (s *serverReflectionServer) processMessage(fd *dpb.FileDescriptorProto, prefix string, msg *dpb.DescriptorProto) {
+	msgName := fqn(prefix, msg.GetName())
+	s.symbols[msgName] = fd
+
+	for _, nested := range msg.NestedType {
+		s.processMessage(fd, msgName, nested)
+	}
+	for _, en := range msg.EnumType {
+		s.processEnum(fd, msgName, en)
+	}
+	for _, ext := range msg.Extension {
+		s.processField(fd, msgName, ext)
+	}
+	for _, fld := range msg.Field {
+		s.processField(fd, msgName, fld)
+	}
+	for _, oneof := range msg.OneofDecl {
+		oneofName := fqn(msgName, oneof.GetName())
+		s.symbols[oneofName] = fd
+	}
+}
+
+func (s *serverReflectionServer) processEnum(fd *dpb.FileDescriptorProto, prefix string, en *dpb.EnumDescriptorProto) {
+	enName := fqn(prefix, en.GetName())
+	s.symbols[enName] = fd
+
+	for _, val := range en.Value {
+		valName := fqn(enName, val.GetName())
+		s.symbols[valName] = fd
+	}
+}
+
+func (s *serverReflectionServer) processField(fd *dpb.FileDescriptorProto, prefix string, fld *dpb.FieldDescriptorProto) {
+	fldName := fqn(prefix, fld.GetName())
+	s.symbols[fldName] = fd
+}
+
+func fqn(prefix, name string) string {
+	if prefix == "" {
+		return name
+	}
+	return prefix + "." + name
+}
+
+// fileDescForType gets the file descriptor for the given type.
+// The given type should be a proto message.
+func (s *serverReflectionServer) fileDescForType(st reflect.Type) (*dpb.FileDescriptorProto, error) {
+	m, ok := reflect.Zero(reflect.PtrTo(st)).Interface().(protoMessage)
+	if !ok {
+		return nil, fmt.Errorf("failed to create message from type: %v", st)
+	}
+	enc, _ := m.Descriptor()
+
+	return decodeFileDesc(enc)
+}
+
+// decodeFileDesc does decompression and unmarshalling on the given
+// file descriptor byte slice.
+func decodeFileDesc(enc []byte) (*dpb.FileDescriptorProto, error) {
+	raw, err := decompress(enc)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decompress enc: %v", err)
+	}
+
+	fd := new(dpb.FileDescriptorProto)
+	if err := proto.Unmarshal(raw, fd); err != nil {
+		return nil, fmt.Errorf("bad descriptor: %v", err)
+	}
+	return fd, nil
+}
+
+// decompress does gzip decompression.
+func decompress(b []byte) ([]byte, error) {
+	r, err := gzip.NewReader(bytes.NewReader(b))
+	if err != nil {
+		return nil, fmt.Errorf("bad gzipped descriptor: %v", err)
+	}
+	out, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, fmt.Errorf("bad gzipped descriptor: %v", err)
+	}
+	return out, nil
+}
+
+func typeForName(name string) (reflect.Type, error) {
+	pt := proto.MessageType(name)
+	if pt == nil {
+		return nil, fmt.Errorf("unknown type: %q", name)
+	}
+	st := pt.Elem()
+
+	return st, nil
+}
+
+func fileDescContainingExtension(st reflect.Type, ext int32) (*dpb.FileDescriptorProto, error) {
+	m, ok := reflect.Zero(reflect.PtrTo(st)).Interface().(proto.Message)
+	if !ok {
+		return nil, fmt.Errorf("failed to create message from type: %v", st)
+	}
+
+	var extDesc *proto.ExtensionDesc
+	for id, desc := range proto.RegisteredExtensions(m) {
+		if id == ext {
+			extDesc = desc
+			break
+		}
+	}
+
+	if extDesc == nil {
+		return nil, fmt.Errorf("failed to find registered extension for extension number %v", ext)
+	}
+
+	return decodeFileDesc(proto.FileDescriptor(extDesc.Filename))
+}
+
+func (s *serverReflectionServer) allExtensionNumbersForType(st reflect.Type) ([]int32, error) {
+	m, ok := reflect.Zero(reflect.PtrTo(st)).Interface().(proto.Message)
+	if !ok {
+		return nil, fmt.Errorf("failed to create message from type: %v", st)
+	}
+
+	exts := proto.RegisteredExtensions(m)
+	out := make([]int32, 0, len(exts))
+	for id := range exts {
+		out = append(out, id)
+	}
+	return out, nil
+}
+
+// fileDescEncodingByFilename finds the file descriptor for given filename,
+// does marshalling on it and returns the marshalled result.
+func (s *serverReflectionServer) fileDescEncodingByFilename(name string) ([]byte, error) {
+	enc := proto.FileDescriptor(name)
+	if enc == nil {
+		return nil, fmt.Errorf("unknown file: %v", name)
+	}
+	fd, err := decodeFileDesc(enc)
+	if err != nil {
+		return nil, err
+	}
+	return proto.Marshal(fd)
+}
+
+// parseMetadata finds the file descriptor bytes specified meta.
+// For SupportPackageIsVersion4, m is the name of the proto file, we
+// call proto.FileDescriptor to get the byte slice.
+// For SupportPackageIsVersion3, m is a byte slice itself.
+func parseMetadata(meta interface{}) ([]byte, bool) {
+	// Check if meta is the file name.
+	if fileNameForMeta, ok := meta.(string); ok {
+		return proto.FileDescriptor(fileNameForMeta), true
+	}
+
+	// Check if meta is the byte slice.
+	if enc, ok := meta.([]byte); ok {
+		return enc, true
+	}
+
+	return nil, false
+}
+
+// fileDescEncodingContainingSymbol finds the file descriptor containing the given symbol,
+// does marshalling on it and returns the marshalled result.
+// The given symbol can be a type, a service or a method.
+func (s *serverReflectionServer) fileDescEncodingContainingSymbol(name string) ([]byte, error) {
+	_, symbols := s.getSymbols()
+	fd := symbols[name]
+	if fd == nil {
+		// Check if it's a type name that was not present in the
+		// transitive dependencies of the registered services.
+		if st, err := typeForName(name); err == nil {
+			fd, err = s.fileDescForType(st)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	if fd == nil {
+		return nil, fmt.Errorf("unknown symbol: %v", name)
+	}
+
+	return proto.Marshal(fd)
+}
+
+// fileDescEncodingContainingExtension finds the file descriptor containing given extension,
+// does marshalling on it and returns the marshalled result.
+func (s *serverReflectionServer) fileDescEncodingContainingExtension(typeName string, extNum int32) ([]byte, error) {
+	st, err := typeForName(typeName)
+	if err != nil {
+		return nil, err
+	}
+	fd, err := fileDescContainingExtension(st, extNum)
+	if err != nil {
+		return nil, err
+	}
+	return proto.Marshal(fd)
+}
+
+// allExtensionNumbersForTypeName returns all extension numbers for the given type.
+func (s *serverReflectionServer) allExtensionNumbersForTypeName(name string) ([]int32, error) {
+	st, err := typeForName(name)
+	if err != nil {
+		return nil, err
+	}
+	extNums, err := s.allExtensionNumbersForType(st)
+	if err != nil {
+		return nil, err
+	}
+	return extNums, nil
+}
+
+// ServerReflectionInfo is the reflection service handler.
+func (s *serverReflectionServer) ServerReflectionInfo(stream rpb.ServerReflection_ServerReflectionInfoServer) error {
+	for {
+		in, err := stream.Recv()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+
+		out := &rpb.ServerReflectionResponse{
+			ValidHost:       in.Host,
+			OriginalRequest: in,
+		}
+		switch req := in.MessageRequest.(type) {
+		case *rpb.ServerReflectionRequest_FileByFilename:
+			b, err := s.fileDescEncodingByFilename(req.FileByFilename)
+			if err != nil {
+				out.MessageResponse = &rpb.ServerReflectionResponse_ErrorResponse{
+					ErrorResponse: &rpb.ErrorResponse{
+						ErrorCode:    int32(codes.NotFound),
+						ErrorMessage: err.Error(),
+					},
+				}
+			} else {
+				out.MessageResponse = &rpb.ServerReflectionResponse_FileDescriptorResponse{
+					FileDescriptorResponse: &rpb.FileDescriptorResponse{FileDescriptorProto: [][]byte{b}},
+				}
+			}
+		case *rpb.ServerReflectionRequest_FileContainingSymbol:
+			b, err := s.fileDescEncodingContainingSymbol(req.FileContainingSymbol)
+			if err != nil {
+				out.MessageResponse = &rpb.ServerReflectionResponse_ErrorResponse{
+					ErrorResponse: &rpb.ErrorResponse{
+						ErrorCode:    int32(codes.NotFound),
+						ErrorMessage: err.Error(),
+					},
+				}
+			} else {
+				out.MessageResponse = &rpb.ServerReflectionResponse_FileDescriptorResponse{
+					FileDescriptorResponse: &rpb.FileDescriptorResponse{FileDescriptorProto: [][]byte{b}},
+				}
+			}
+		case *rpb.ServerReflectionRequest_FileContainingExtension:
+			typeName := req.FileContainingExtension.ContainingType
+			extNum := req.FileContainingExtension.ExtensionNumber
+			b, err := s.fileDescEncodingContainingExtension(typeName, extNum)
+			if err != nil {
+				out.MessageResponse = &rpb.ServerReflectionResponse_ErrorResponse{
+					ErrorResponse: &rpb.ErrorResponse{
+						ErrorCode:    int32(codes.NotFound),
+						ErrorMessage: err.Error(),
+					},
+				}
+			} else {
+				out.MessageResponse = &rpb.ServerReflectionResponse_FileDescriptorResponse{
+					FileDescriptorResponse: &rpb.FileDescriptorResponse{FileDescriptorProto: [][]byte{b}},
+				}
+			}
+		case *rpb.ServerReflectionRequest_AllExtensionNumbersOfType:
+			extNums, err := s.allExtensionNumbersForTypeName(req.AllExtensionNumbersOfType)
+			if err != nil {
+				out.MessageResponse = &rpb.ServerReflectionResponse_ErrorResponse{
+					ErrorResponse: &rpb.ErrorResponse{
+						ErrorCode:    int32(codes.NotFound),
+						ErrorMessage: err.Error(),
+					},
+				}
+			} else {
+				out.MessageResponse = &rpb.ServerReflectionResponse_AllExtensionNumbersResponse{
+					AllExtensionNumbersResponse: &rpb.ExtensionNumberResponse{
+						BaseTypeName:    req.AllExtensionNumbersOfType,
+						ExtensionNumber: extNums,
+					},
+				}
+			}
+		case *rpb.ServerReflectionRequest_ListServices:
+			svcNames, _ := s.getSymbols()
+			serviceResponses := make([]*rpb.ServiceResponse, len(svcNames))
+			for i, n := range svcNames {
+				serviceResponses[i] = &rpb.ServiceResponse{
+					Name: n,
+				}
+			}
+			out.MessageResponse = &rpb.ServerReflectionResponse_ListServicesResponse{
+				ListServicesResponse: &rpb.ListServiceResponse{
+					Service: serviceResponses,
+				},
+			}
+		default:
+			return status.Errorf(codes.InvalidArgument, "invalid MessageRequest: %v", in.MessageRequest)
+		}
+
+		if err := stream.Send(out); err != nil {
+			return err
+		}
+	}
+}
diff --git a/vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go
new file mode 100644
index 0000000..14aa6f2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go
@@ -0,0 +1,36 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package dns implements a dns resolver to be installed as the default resolver
+// in grpc.
+//
+// Deprecated: this package is imported by grpc and should not need to be
+// imported directly by users.
+package dns
+
+import (
+	"google.golang.org/grpc/internal/resolver/dns"
+	"google.golang.org/grpc/resolver"
+)
+
+// NewBuilder creates a dnsBuilder which is used to factory DNS resolvers.
+//
+// Deprecated: import grpc and use resolver.Get("dns") instead.
+func NewBuilder() resolver.Builder {
+	return dns.NewBuilder()
+}
diff --git a/vendor/google.golang.org/grpc/resolver/passthrough/passthrough.go b/vendor/google.golang.org/grpc/resolver/passthrough/passthrough.go
new file mode 100644
index 0000000..c8a0c3d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/passthrough/passthrough.go
@@ -0,0 +1,26 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package passthrough implements a pass-through resolver. It sends the target
+// name without scheme back to gRPC as resolved address.
+//
+// Deprecated: this package is imported by grpc and should not need to be
+// imported directly by users.
+package passthrough
+
+import _ "google.golang.org/grpc/internal/resolver/passthrough" // import for side effects after package was moved
diff --git a/vendor/google.golang.org/grpc/resolver/resolver.go b/vendor/google.golang.org/grpc/resolver/resolver.go
new file mode 100644
index 0000000..03567d7
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/resolver.go
@@ -0,0 +1,263 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package resolver defines APIs for name resolution in gRPC.
+// All APIs in this package are experimental.
+package resolver
+
+import (
+	"context"
+	"net"
+
+	"google.golang.org/grpc/attributes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+var (
+	// m is a map from scheme to resolver builder.
+	m = make(map[string]Builder)
+	// defaultScheme is the default scheme to use.
+	defaultScheme = "passthrough"
+)
+
+// TODO(bar) install dns resolver in init(){}.
+
+// Register registers the resolver builder to the resolver map. b.Scheme will be
+// used as the scheme registered with this builder.
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe. If multiple Resolvers are
+// registered with the same name, the one registered last will take effect.
+func Register(b Builder) {
+	m[b.Scheme()] = b
+}
+
+// Get returns the resolver builder registered with the given scheme.
+//
+// If no builder is register with the scheme, nil will be returned.
+func Get(scheme string) Builder {
+	if b, ok := m[scheme]; ok {
+		return b
+	}
+	return nil
+}
+
+// SetDefaultScheme sets the default scheme that will be used. The default
+// default scheme is "passthrough".
+//
+// NOTE: this function must only be called during initialization time (i.e. in
+// an init() function), and is not thread-safe. The scheme set last overrides
+// previously set values.
+func SetDefaultScheme(scheme string) {
+	defaultScheme = scheme
+}
+
+// GetDefaultScheme gets the default scheme that will be used.
+func GetDefaultScheme() string {
+	return defaultScheme
+}
+
+// AddressType indicates the address type returned by name resolution.
+//
+// Deprecated: use Attributes in Address instead.
+type AddressType uint8
+
+const (
+	// Backend indicates the address is for a backend server.
+	//
+	// Deprecated: use Attributes in Address instead.
+	Backend AddressType = iota
+	// GRPCLB indicates the address is for a grpclb load balancer.
+	//
+	// Deprecated: use Attributes in Address instead.
+	GRPCLB
+)
+
+// Address represents a server the client connects to.
+// This is the EXPERIMENTAL API and may be changed or extended in the future.
+type Address struct {
+	// Addr is the server address on which a connection will be established.
+	Addr string
+
+	// ServerName is the name of this address.
+	// If non-empty, the ServerName is used as the transport certification authority for
+	// the address, instead of the hostname from the Dial target string. In most cases,
+	// this should not be set.
+	//
+	// If Type is GRPCLB, ServerName should be the name of the remote load
+	// balancer, not the name of the backend.
+	//
+	// WARNING: ServerName must only be populated with trusted values. It
+	// is insecure to populate it with data from untrusted inputs since untrusted
+	// values could be used to bypass the authority checks performed by TLS.
+	ServerName string
+
+	// Attributes contains arbitrary data about this address intended for
+	// consumption by the load balancing policy.
+	Attributes *attributes.Attributes
+
+	// Type is the type of this address.
+	//
+	// Deprecated: use Attributes instead.
+	Type AddressType
+
+	// Metadata is the information associated with Addr, which may be used
+	// to make load balancing decision.
+	//
+	// Deprecated: use Attributes instead.
+	Metadata interface{}
+}
+
+// BuildOption is a type alias of BuildOptions for legacy reasons.
+//
+// Deprecated: use BuildOptions instead.
+type BuildOption = BuildOptions
+
+// BuildOptions includes additional information for the builder to create
+// the resolver.
+type BuildOptions struct {
+	// DisableServiceConfig indicates whether a resolver implementation should
+	// fetch service config data.
+	DisableServiceConfig bool
+	// DialCreds is the transport credentials used by the ClientConn for
+	// communicating with the target gRPC service (set via
+	// WithTransportCredentials). In cases where a name resolution service
+	// requires the same credentials, the resolver may use this field. In most
+	// cases though, it is not appropriate, and this field may be ignored.
+	DialCreds credentials.TransportCredentials
+	// CredsBundle is the credentials bundle used by the ClientConn for
+	// communicating with the target gRPC service (set via
+	// WithCredentialsBundle). In cases where a name resolution service
+	// requires the same credentials, the resolver may use this field. In most
+	// cases though, it is not appropriate, and this field may be ignored.
+	CredsBundle credentials.Bundle
+	// Dialer is the custom dialer used by the ClientConn for dialling the
+	// target gRPC service (set via WithDialer). In cases where a name
+	// resolution service requires the same dialer, the resolver may use this
+	// field. In most cases though, it is not appropriate, and this field may
+	// be ignored.
+	Dialer func(context.Context, string) (net.Conn, error)
+}
+
+// State contains the current Resolver state relevant to the ClientConn.
+type State struct {
+	// Addresses is the latest set of resolved addresses for the target.
+	Addresses []Address
+
+	// ServiceConfig contains the result from parsing the latest service
+	// config.  If it is nil, it indicates no service config is present or the
+	// resolver does not provide service configs.
+	ServiceConfig *serviceconfig.ParseResult
+
+	// Attributes contains arbitrary data about the resolver intended for
+	// consumption by the load balancing policy.
+	Attributes *attributes.Attributes
+}
+
+// ClientConn contains the callbacks for resolver to notify any updates
+// to the gRPC ClientConn.
+//
+// This interface is to be implemented by gRPC. Users should not need a
+// brand new implementation of this interface. For the situations like
+// testing, the new implementation should embed this interface. This allows
+// gRPC to add new methods to this interface.
+type ClientConn interface {
+	// UpdateState updates the state of the ClientConn appropriately.
+	UpdateState(State)
+	// ReportError notifies the ClientConn that the Resolver encountered an
+	// error.  The ClientConn will notify the load balancer and begin calling
+	// ResolveNow on the Resolver with exponential backoff.
+	ReportError(error)
+	// NewAddress is called by resolver to notify ClientConn a new list
+	// of resolved addresses.
+	// The address list should be the complete list of resolved addresses.
+	//
+	// Deprecated: Use UpdateState instead.
+	NewAddress(addresses []Address)
+	// NewServiceConfig is called by resolver to notify ClientConn a new
+	// service config. The service config should be provided as a json string.
+	//
+	// Deprecated: Use UpdateState instead.
+	NewServiceConfig(serviceConfig string)
+	// ParseServiceConfig parses the provided service config and returns an
+	// object that provides the parsed config.
+	ParseServiceConfig(serviceConfigJSON string) *serviceconfig.ParseResult
+}
+
+// Target represents a target for gRPC, as specified in:
+// https://github.com/grpc/grpc/blob/master/doc/naming.md.
+// It is parsed from the target string that gets passed into Dial or DialContext by the user. And
+// grpc passes it to the resolver and the balancer.
+//
+// If the target follows the naming spec, and the parsed scheme is registered with grpc, we will
+// parse the target string according to the spec. e.g. "dns://some_authority/foo.bar" will be parsed
+// into &Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
+//
+// If the target does not contain a scheme, we will apply the default scheme, and set the Target to
+// be the full target string. e.g. "foo.bar" will be parsed into
+// &Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}.
+//
+// If the parsed scheme is not registered (i.e. no corresponding resolver available to resolve the
+// endpoint), we set the Scheme to be the default scheme, and set the Endpoint to be the full target
+// string. e.g. target string "unknown_scheme://authority/endpoint" will be parsed into
+// &Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}.
+type Target struct {
+	Scheme    string
+	Authority string
+	Endpoint  string
+}
+
+// Builder creates a resolver that will be used to watch name resolution updates.
+type Builder interface {
+	// Build creates a new resolver for the given target.
+	//
+	// gRPC dial calls Build synchronously, and fails if the returned error is
+	// not nil.
+	Build(target Target, cc ClientConn, opts BuildOptions) (Resolver, error)
+	// Scheme returns the scheme supported by this resolver.
+	// Scheme is defined at https://github.com/grpc/grpc/blob/master/doc/naming.md.
+	Scheme() string
+}
+
+// ResolveNowOption is a type alias of ResolveNowOptions for legacy reasons.
+//
+// Deprecated: use ResolveNowOptions instead.
+type ResolveNowOption = ResolveNowOptions
+
+// ResolveNowOptions includes additional information for ResolveNow.
+type ResolveNowOptions struct{}
+
+// Resolver watches for the updates on the specified target.
+// Updates include address updates and service config updates.
+type Resolver interface {
+	// ResolveNow will be called by gRPC to try to resolve the target name
+	// again. It's just a hint, resolver can ignore this if it's not necessary.
+	//
+	// It could be called multiple times concurrently.
+	ResolveNow(ResolveNowOptions)
+	// Close closes the resolver.
+	Close()
+}
+
+// UnregisterForTesting removes the resolver builder with the given scheme from the
+// resolver map.
+// This function is for testing only.
+func UnregisterForTesting(scheme string) {
+	delete(m, scheme)
+}
diff --git a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
new file mode 100644
index 0000000..89ba9fa
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
@@ -0,0 +1,269 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+// ccResolverWrapper is a wrapper on top of cc for resolvers.
+// It implements resolver.ClientConnection interface.
+type ccResolverWrapper struct {
+	cc         *ClientConn
+	resolverMu sync.Mutex
+	resolver   resolver.Resolver
+	done       *grpcsync.Event
+	curState   resolver.State
+
+	pollingMu sync.Mutex
+	polling   chan struct{}
+}
+
+// split2 returns the values from strings.SplitN(s, sep, 2).
+// If sep is not found, it returns ("", "", false) instead.
+func split2(s, sep string) (string, string, bool) {
+	spl := strings.SplitN(s, sep, 2)
+	if len(spl) < 2 {
+		return "", "", false
+	}
+	return spl[0], spl[1], true
+}
+
+// parseTarget splits target into a struct containing scheme, authority and
+// endpoint.
+//
+// If target is not a valid scheme://authority/endpoint, it returns {Endpoint:
+// target}.
+func parseTarget(target string) (ret resolver.Target) {
+	var ok bool
+	ret.Scheme, ret.Endpoint, ok = split2(target, "://")
+	if !ok {
+		return resolver.Target{Endpoint: target}
+	}
+	ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/")
+	if !ok {
+		return resolver.Target{Endpoint: target}
+	}
+	return ret
+}
+
+// newCCResolverWrapper uses the resolver.Builder stored in the ClientConn to
+// build a Resolver and returns a ccResolverWrapper object which wraps the
+// newly built resolver.
+func newCCResolverWrapper(cc *ClientConn) (*ccResolverWrapper, error) {
+	rb := cc.dopts.resolverBuilder
+	if rb == nil {
+		return nil, fmt.Errorf("could not get resolver for scheme: %q", cc.parsedTarget.Scheme)
+	}
+
+	ccr := &ccResolverWrapper{
+		cc:   cc,
+		done: grpcsync.NewEvent(),
+	}
+
+	var credsClone credentials.TransportCredentials
+	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
+		credsClone = creds.Clone()
+	}
+	rbo := resolver.BuildOptions{
+		DisableServiceConfig: cc.dopts.disableServiceConfig,
+		DialCreds:            credsClone,
+		CredsBundle:          cc.dopts.copts.CredsBundle,
+		Dialer:               cc.dopts.copts.Dialer,
+	}
+
+	var err error
+	// We need to hold the lock here while we assign to the ccr.resolver field
+	// to guard against a data race caused by the following code path,
+	// rb.Build-->ccr.ReportError-->ccr.poll-->ccr.resolveNow, would end up
+	// accessing ccr.resolver which is being assigned here.
+	ccr.resolverMu.Lock()
+	defer ccr.resolverMu.Unlock()
+	ccr.resolver, err = rb.Build(cc.parsedTarget, ccr, rbo)
+	if err != nil {
+		return nil, err
+	}
+	return ccr, nil
+}
+
+func (ccr *ccResolverWrapper) resolveNow(o resolver.ResolveNowOptions) {
+	ccr.resolverMu.Lock()
+	if !ccr.done.HasFired() {
+		ccr.resolver.ResolveNow(o)
+	}
+	ccr.resolverMu.Unlock()
+}
+
+func (ccr *ccResolverWrapper) close() {
+	ccr.resolverMu.Lock()
+	ccr.resolver.Close()
+	ccr.done.Fire()
+	ccr.resolverMu.Unlock()
+}
+
+// poll begins or ends asynchronous polling of the resolver based on whether
+// err is ErrBadResolverState.
+func (ccr *ccResolverWrapper) poll(err error) {
+	ccr.pollingMu.Lock()
+	defer ccr.pollingMu.Unlock()
+	if err != balancer.ErrBadResolverState {
+		// stop polling
+		if ccr.polling != nil {
+			close(ccr.polling)
+			ccr.polling = nil
+		}
+		return
+	}
+	if ccr.polling != nil {
+		// already polling
+		return
+	}
+	p := make(chan struct{})
+	ccr.polling = p
+	go func() {
+		for i := 0; ; i++ {
+			ccr.resolveNow(resolver.ResolveNowOptions{})
+			t := time.NewTimer(ccr.cc.dopts.resolveNowBackoff(i))
+			select {
+			case <-p:
+				t.Stop()
+				return
+			case <-ccr.done.Done():
+				// Resolver has been closed.
+				t.Stop()
+				return
+			case <-t.C:
+				select {
+				case <-p:
+					return
+				default:
+				}
+				// Timer expired; re-resolve.
+			}
+		}
+	}()
+}
+
+func (ccr *ccResolverWrapper) UpdateState(s resolver.State) {
+	if ccr.done.HasFired() {
+		return
+	}
+	grpclog.Infof("ccResolverWrapper: sending update to cc: %v", s)
+	if channelz.IsOn() {
+		ccr.addChannelzTraceEvent(s)
+	}
+	ccr.curState = s
+	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+}
+
+func (ccr *ccResolverWrapper) ReportError(err error) {
+	if ccr.done.HasFired() {
+		return
+	}
+	grpclog.Warningf("ccResolverWrapper: reporting error to cc: %v", err)
+	if channelz.IsOn() {
+		channelz.AddTraceEvent(ccr.cc.channelzID, &channelz.TraceEventDesc{
+			Desc:     fmt.Sprintf("Resolver reported error: %v", err),
+			Severity: channelz.CtWarning,
+		})
+	}
+	ccr.poll(ccr.cc.updateResolverState(resolver.State{}, err))
+}
+
+// NewAddress is called by the resolver implementation to send addresses to gRPC.
+func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
+	if ccr.done.HasFired() {
+		return
+	}
+	grpclog.Infof("ccResolverWrapper: sending new addresses to cc: %v", addrs)
+	if channelz.IsOn() {
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
+	}
+	ccr.curState.Addresses = addrs
+	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+}
+
+// NewServiceConfig is called by the resolver implementation to send service
+// configs to gRPC.
+func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
+	if ccr.done.HasFired() {
+		return
+	}
+	grpclog.Infof("ccResolverWrapper: got new service config: %v", sc)
+	if ccr.cc.dopts.disableServiceConfig {
+		grpclog.Infof("Service config lookups disabled; ignoring config")
+		return
+	}
+	scpr := parseServiceConfig(sc)
+	if scpr.Err != nil {
+		grpclog.Warningf("ccResolverWrapper: error parsing service config: %v", scpr.Err)
+		if channelz.IsOn() {
+			channelz.AddTraceEvent(ccr.cc.channelzID, &channelz.TraceEventDesc{
+				Desc:     fmt.Sprintf("Error parsing service config: %v", scpr.Err),
+				Severity: channelz.CtWarning,
+			})
+		}
+		ccr.poll(balancer.ErrBadResolverState)
+		return
+	}
+	if channelz.IsOn() {
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
+	}
+	ccr.curState.ServiceConfig = scpr
+	ccr.poll(ccr.cc.updateResolverState(ccr.curState, nil))
+}
+
+func (ccr *ccResolverWrapper) ParseServiceConfig(scJSON string) *serviceconfig.ParseResult {
+	return parseServiceConfig(scJSON)
+}
+
+func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
+	var updates []string
+	var oldSC, newSC *ServiceConfig
+	var oldOK, newOK bool
+	if ccr.curState.ServiceConfig != nil {
+		oldSC, oldOK = ccr.curState.ServiceConfig.Config.(*ServiceConfig)
+	}
+	if s.ServiceConfig != nil {
+		newSC, newOK = s.ServiceConfig.Config.(*ServiceConfig)
+	}
+	if oldOK != newOK || (oldOK && newOK && oldSC.rawJSONString != newSC.rawJSONString) {
+		updates = append(updates, "service config updated")
+	}
+	if len(ccr.curState.Addresses) > 0 && len(s.Addresses) == 0 {
+		updates = append(updates, "resolver returned an empty address list")
+	} else if len(ccr.curState.Addresses) == 0 && len(s.Addresses) > 0 {
+		updates = append(updates, "resolver returned new addresses")
+	}
+	channelz.AddTraceEvent(ccr.cc.channelzID, &channelz.TraceEventDesc{
+		Desc:     fmt.Sprintf("Resolver state updated: %+v (%v)", s, strings.Join(updates, "; ")),
+		Severity: channelz.CtINFO,
+	})
+}
diff --git a/vendor/google.golang.org/grpc/rpc_util.go b/vendor/google.golang.org/grpc/rpc_util.go
new file mode 100644
index 0000000..edaba79
--- /dev/null
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@@ -0,0 +1,886 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"bytes"
+	"compress/gzip"
+	"context"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/grpc/encoding/proto"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+)
+
+// Compressor defines the interface gRPC uses to compress a message.
+//
+// Deprecated: use package encoding.
+type Compressor interface {
+	// Do compresses p into w.
+	Do(w io.Writer, p []byte) error
+	// Type returns the compression algorithm the Compressor uses.
+	Type() string
+}
+
+type gzipCompressor struct {
+	pool sync.Pool
+}
+
+// NewGZIPCompressor creates a Compressor based on GZIP.
+//
+// Deprecated: use package encoding/gzip.
+func NewGZIPCompressor() Compressor {
+	c, _ := NewGZIPCompressorWithLevel(gzip.DefaultCompression)
+	return c
+}
+
+// NewGZIPCompressorWithLevel is like NewGZIPCompressor but specifies the gzip compression level instead
+// of assuming DefaultCompression.
+//
+// The error returned will be nil if the level is valid.
+//
+// Deprecated: use package encoding/gzip.
+func NewGZIPCompressorWithLevel(level int) (Compressor, error) {
+	if level < gzip.DefaultCompression || level > gzip.BestCompression {
+		return nil, fmt.Errorf("grpc: invalid compression level: %d", level)
+	}
+	return &gzipCompressor{
+		pool: sync.Pool{
+			New: func() interface{} {
+				w, err := gzip.NewWriterLevel(ioutil.Discard, level)
+				if err != nil {
+					panic(err)
+				}
+				return w
+			},
+		},
+	}, nil
+}
+
+func (c *gzipCompressor) Do(w io.Writer, p []byte) error {
+	z := c.pool.Get().(*gzip.Writer)
+	defer c.pool.Put(z)
+	z.Reset(w)
+	if _, err := z.Write(p); err != nil {
+		return err
+	}
+	return z.Close()
+}
+
+func (c *gzipCompressor) Type() string {
+	return "gzip"
+}
+
+// Decompressor defines the interface gRPC uses to decompress a message.
+//
+// Deprecated: use package encoding.
+type Decompressor interface {
+	// Do reads the data from r and uncompress them.
+	Do(r io.Reader) ([]byte, error)
+	// Type returns the compression algorithm the Decompressor uses.
+	Type() string
+}
+
+type gzipDecompressor struct {
+	pool sync.Pool
+}
+
+// NewGZIPDecompressor creates a Decompressor based on GZIP.
+//
+// Deprecated: use package encoding/gzip.
+func NewGZIPDecompressor() Decompressor {
+	return &gzipDecompressor{}
+}
+
+func (d *gzipDecompressor) Do(r io.Reader) ([]byte, error) {
+	var z *gzip.Reader
+	switch maybeZ := d.pool.Get().(type) {
+	case nil:
+		newZ, err := gzip.NewReader(r)
+		if err != nil {
+			return nil, err
+		}
+		z = newZ
+	case *gzip.Reader:
+		z = maybeZ
+		if err := z.Reset(r); err != nil {
+			d.pool.Put(z)
+			return nil, err
+		}
+	}
+
+	defer func() {
+		z.Close()
+		d.pool.Put(z)
+	}()
+	return ioutil.ReadAll(z)
+}
+
+func (d *gzipDecompressor) Type() string {
+	return "gzip"
+}
+
+// callInfo contains all related configuration and information about an RPC.
+type callInfo struct {
+	compressorType        string
+	failFast              bool
+	stream                ClientStream
+	maxReceiveMessageSize *int
+	maxSendMessageSize    *int
+	creds                 credentials.PerRPCCredentials
+	contentSubtype        string
+	codec                 baseCodec
+	maxRetryRPCBufferSize int
+}
+
+func defaultCallInfo() *callInfo {
+	return &callInfo{
+		failFast:              true,
+		maxRetryRPCBufferSize: 256 * 1024, // 256KB
+	}
+}
+
+// CallOption configures a Call before it starts or extracts information from
+// a Call after it completes.
+type CallOption interface {
+	// before is called before the call is sent to any server.  If before
+	// returns a non-nil error, the RPC fails with that error.
+	before(*callInfo) error
+
+	// after is called after the call has completed.  after cannot return an
+	// error, so any failures should be reported via output parameters.
+	after(*callInfo)
+}
+
+// EmptyCallOption does not alter the Call configuration.
+// It can be embedded in another structure to carry satellite data for use
+// by interceptors.
+type EmptyCallOption struct{}
+
+func (EmptyCallOption) before(*callInfo) error { return nil }
+func (EmptyCallOption) after(*callInfo)        {}
+
+// Header returns a CallOptions that retrieves the header metadata
+// for a unary RPC.
+func Header(md *metadata.MD) CallOption {
+	return HeaderCallOption{HeaderAddr: md}
+}
+
+// HeaderCallOption is a CallOption for collecting response header metadata.
+// The metadata field will be populated *after* the RPC completes.
+// This is an EXPERIMENTAL API.
+type HeaderCallOption struct {
+	HeaderAddr *metadata.MD
+}
+
+func (o HeaderCallOption) before(c *callInfo) error { return nil }
+func (o HeaderCallOption) after(c *callInfo) {
+	if c.stream != nil {
+		*o.HeaderAddr, _ = c.stream.Header()
+	}
+}
+
+// Trailer returns a CallOptions that retrieves the trailer metadata
+// for a unary RPC.
+func Trailer(md *metadata.MD) CallOption {
+	return TrailerCallOption{TrailerAddr: md}
+}
+
+// TrailerCallOption is a CallOption for collecting response trailer metadata.
+// The metadata field will be populated *after* the RPC completes.
+// This is an EXPERIMENTAL API.
+type TrailerCallOption struct {
+	TrailerAddr *metadata.MD
+}
+
+func (o TrailerCallOption) before(c *callInfo) error { return nil }
+func (o TrailerCallOption) after(c *callInfo) {
+	if c.stream != nil {
+		*o.TrailerAddr = c.stream.Trailer()
+	}
+}
+
+// Peer returns a CallOption that retrieves peer information for a unary RPC.
+// The peer field will be populated *after* the RPC completes.
+func Peer(p *peer.Peer) CallOption {
+	return PeerCallOption{PeerAddr: p}
+}
+
+// PeerCallOption is a CallOption for collecting the identity of the remote
+// peer. The peer field will be populated *after* the RPC completes.
+// This is an EXPERIMENTAL API.
+type PeerCallOption struct {
+	PeerAddr *peer.Peer
+}
+
+func (o PeerCallOption) before(c *callInfo) error { return nil }
+func (o PeerCallOption) after(c *callInfo) {
+	if c.stream != nil {
+		if x, ok := peer.FromContext(c.stream.Context()); ok {
+			*o.PeerAddr = *x
+		}
+	}
+}
+
+// WaitForReady configures the action to take when an RPC is attempted on broken
+// connections or unreachable servers. If waitForReady is false, the RPC will fail
+// immediately. Otherwise, the RPC client will block the call until a
+// connection is available (or the call is canceled or times out) and will
+// retry the call if it fails due to a transient error.  gRPC will not retry if
+// data was written to the wire unless the server indicates it did not process
+// the data.  Please refer to
+// https://github.com/grpc/grpc/blob/master/doc/wait-for-ready.md.
+//
+// By default, RPCs don't "wait for ready".
+func WaitForReady(waitForReady bool) CallOption {
+	return FailFastCallOption{FailFast: !waitForReady}
+}
+
+// FailFast is the opposite of WaitForReady.
+//
+// Deprecated: use WaitForReady.
+func FailFast(failFast bool) CallOption {
+	return FailFastCallOption{FailFast: failFast}
+}
+
+// FailFastCallOption is a CallOption for indicating whether an RPC should fail
+// fast or not.
+// This is an EXPERIMENTAL API.
+type FailFastCallOption struct {
+	FailFast bool
+}
+
+func (o FailFastCallOption) before(c *callInfo) error {
+	c.failFast = o.FailFast
+	return nil
+}
+func (o FailFastCallOption) after(c *callInfo) {}
+
+// MaxCallRecvMsgSize returns a CallOption which sets the maximum message size the client can receive.
+func MaxCallRecvMsgSize(s int) CallOption {
+	return MaxRecvMsgSizeCallOption{MaxRecvMsgSize: s}
+}
+
+// MaxRecvMsgSizeCallOption is a CallOption that indicates the maximum message
+// size the client can receive.
+// This is an EXPERIMENTAL API.
+type MaxRecvMsgSizeCallOption struct {
+	MaxRecvMsgSize int
+}
+
+func (o MaxRecvMsgSizeCallOption) before(c *callInfo) error {
+	c.maxReceiveMessageSize = &o.MaxRecvMsgSize
+	return nil
+}
+func (o MaxRecvMsgSizeCallOption) after(c *callInfo) {}
+
+// MaxCallSendMsgSize returns a CallOption which sets the maximum message size the client can send.
+func MaxCallSendMsgSize(s int) CallOption {
+	return MaxSendMsgSizeCallOption{MaxSendMsgSize: s}
+}
+
+// MaxSendMsgSizeCallOption is a CallOption that indicates the maximum message
+// size the client can send.
+// This is an EXPERIMENTAL API.
+type MaxSendMsgSizeCallOption struct {
+	MaxSendMsgSize int
+}
+
+func (o MaxSendMsgSizeCallOption) before(c *callInfo) error {
+	c.maxSendMessageSize = &o.MaxSendMsgSize
+	return nil
+}
+func (o MaxSendMsgSizeCallOption) after(c *callInfo) {}
+
+// PerRPCCredentials returns a CallOption that sets credentials.PerRPCCredentials
+// for a call.
+func PerRPCCredentials(creds credentials.PerRPCCredentials) CallOption {
+	return PerRPCCredsCallOption{Creds: creds}
+}
+
+// PerRPCCredsCallOption is a CallOption that indicates the per-RPC
+// credentials to use for the call.
+// This is an EXPERIMENTAL API.
+type PerRPCCredsCallOption struct {
+	Creds credentials.PerRPCCredentials
+}
+
+func (o PerRPCCredsCallOption) before(c *callInfo) error {
+	c.creds = o.Creds
+	return nil
+}
+func (o PerRPCCredsCallOption) after(c *callInfo) {}
+
+// UseCompressor returns a CallOption which sets the compressor used when
+// sending the request.  If WithCompressor is also set, UseCompressor has
+// higher priority.
+//
+// This API is EXPERIMENTAL.
+func UseCompressor(name string) CallOption {
+	return CompressorCallOption{CompressorType: name}
+}
+
+// CompressorCallOption is a CallOption that indicates the compressor to use.
+// This is an EXPERIMENTAL API.
+type CompressorCallOption struct {
+	CompressorType string
+}
+
+func (o CompressorCallOption) before(c *callInfo) error {
+	c.compressorType = o.CompressorType
+	return nil
+}
+func (o CompressorCallOption) after(c *callInfo) {}
+
+// CallContentSubtype returns a CallOption that will set the content-subtype
+// for a call. For example, if content-subtype is "json", the Content-Type over
+// the wire will be "application/grpc+json". The content-subtype is converted
+// to lowercase before being included in Content-Type. See Content-Type on
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details.
+//
+// If ForceCodec is not also used, the content-subtype will be used to look up
+// the Codec to use in the registry controlled by RegisterCodec. See the
+// documentation on RegisterCodec for details on registration. The lookup of
+// content-subtype is case-insensitive. If no such Codec is found, the call
+// will result in an error with code codes.Internal.
+//
+// If ForceCodec is also used, that Codec will be used for all request and
+// response messages, with the content-subtype set to the given contentSubtype
+// here for requests.
+func CallContentSubtype(contentSubtype string) CallOption {
+	return ContentSubtypeCallOption{ContentSubtype: strings.ToLower(contentSubtype)}
+}
+
+// ContentSubtypeCallOption is a CallOption that indicates the content-subtype
+// used for marshaling messages.
+// This is an EXPERIMENTAL API.
+type ContentSubtypeCallOption struct {
+	ContentSubtype string
+}
+
+func (o ContentSubtypeCallOption) before(c *callInfo) error {
+	c.contentSubtype = o.ContentSubtype
+	return nil
+}
+func (o ContentSubtypeCallOption) after(c *callInfo) {}
+
+// ForceCodec returns a CallOption that will set the given Codec to be
+// used for all request and response messages for a call. The result of calling
+// String() will be used as the content-subtype in a case-insensitive manner.
+//
+// See Content-Type on
+// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for
+// more details. Also see the documentation on RegisterCodec and
+// CallContentSubtype for more details on the interaction between Codec and
+// content-subtype.
+//
+// This function is provided for advanced users; prefer to use only
+// CallContentSubtype to select a registered codec instead.
+//
+// This is an EXPERIMENTAL API.
+func ForceCodec(codec encoding.Codec) CallOption {
+	return ForceCodecCallOption{Codec: codec}
+}
+
+// ForceCodecCallOption is a CallOption that indicates the codec used for
+// marshaling messages.
+//
+// This is an EXPERIMENTAL API.
+type ForceCodecCallOption struct {
+	Codec encoding.Codec
+}
+
+func (o ForceCodecCallOption) before(c *callInfo) error {
+	c.codec = o.Codec
+	return nil
+}
+func (o ForceCodecCallOption) after(c *callInfo) {}
+
+// CallCustomCodec behaves like ForceCodec, but accepts a grpc.Codec instead of
+// an encoding.Codec.
+//
+// Deprecated: use ForceCodec instead.
+func CallCustomCodec(codec Codec) CallOption {
+	return CustomCodecCallOption{Codec: codec}
+}
+
+// CustomCodecCallOption is a CallOption that indicates the codec used for
+// marshaling messages.
+//
+// This is an EXPERIMENTAL API.
+type CustomCodecCallOption struct {
+	Codec Codec
+}
+
+func (o CustomCodecCallOption) before(c *callInfo) error {
+	c.codec = o.Codec
+	return nil
+}
+func (o CustomCodecCallOption) after(c *callInfo) {}
+
+// MaxRetryRPCBufferSize returns a CallOption that limits the amount of memory
+// used for buffering this RPC's requests for retry purposes.
+//
+// This API is EXPERIMENTAL.
+func MaxRetryRPCBufferSize(bytes int) CallOption {
+	return MaxRetryRPCBufferSizeCallOption{bytes}
+}
+
+// MaxRetryRPCBufferSizeCallOption is a CallOption indicating the amount of
+// memory to be used for caching this RPC for retry purposes.
+// This is an EXPERIMENTAL API.
+type MaxRetryRPCBufferSizeCallOption struct {
+	MaxRetryRPCBufferSize int
+}
+
+func (o MaxRetryRPCBufferSizeCallOption) before(c *callInfo) error {
+	c.maxRetryRPCBufferSize = o.MaxRetryRPCBufferSize
+	return nil
+}
+func (o MaxRetryRPCBufferSizeCallOption) after(c *callInfo) {}
+
+// The format of the payload: compressed or not?
+type payloadFormat uint8
+
+const (
+	compressionNone payloadFormat = 0 // no compression
+	compressionMade payloadFormat = 1 // compressed
+)
+
+// parser reads complete gRPC messages from the underlying reader.
+type parser struct {
+	// r is the underlying reader.
+	// See the comment on recvMsg for the permissible
+	// error types.
+	r io.Reader
+
+	// The header of a gRPC message. Find more detail at
+	// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
+	header [5]byte
+}
+
+// recvMsg reads a complete gRPC message from the stream.
+//
+// It returns the message and its payload (compression/encoding)
+// format. The caller owns the returned msg memory.
+//
+// If there is an error, possible values are:
+//   * io.EOF, when no messages remain
+//   * io.ErrUnexpectedEOF
+//   * of type transport.ConnectionError
+//   * an error from the status package
+// No other error values or types must be returned, which also means
+// that the underlying io.Reader must not return an incompatible
+// error.
+func (p *parser) recvMsg(maxReceiveMessageSize int) (pf payloadFormat, msg []byte, err error) {
+	if _, err := p.r.Read(p.header[:]); err != nil {
+		return 0, nil, err
+	}
+
+	pf = payloadFormat(p.header[0])
+	length := binary.BigEndian.Uint32(p.header[1:])
+
+	if length == 0 {
+		return pf, nil, nil
+	}
+	if int64(length) > int64(maxInt) {
+		return 0, nil, status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max length allowed on current machine (%d vs. %d)", length, maxInt)
+	}
+	if int(length) > maxReceiveMessageSize {
+		return 0, nil, status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", length, maxReceiveMessageSize)
+	}
+	// TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
+	// of making it for each message:
+	msg = make([]byte, int(length))
+	if _, err := p.r.Read(msg); err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return 0, nil, err
+	}
+	return pf, msg, nil
+}
+
+// encode serializes msg and returns a buffer containing the message, or an
+// error if it is too large to be transmitted by grpc.  If msg is nil, it
+// generates an empty message.
+func encode(c baseCodec, msg interface{}) ([]byte, error) {
+	if msg == nil { // NOTE: typed nils will not be caught by this check
+		return nil, nil
+	}
+	b, err := c.Marshal(msg)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "grpc: error while marshaling: %v", err.Error())
+	}
+	if uint(len(b)) > math.MaxUint32 {
+		return nil, status.Errorf(codes.ResourceExhausted, "grpc: message too large (%d bytes)", len(b))
+	}
+	return b, nil
+}
+
+// compress returns the input bytes compressed by compressor or cp.  If both
+// compressors are nil, returns nil.
+//
+// TODO(dfawley): eliminate cp parameter by wrapping Compressor in an encoding.Compressor.
+func compress(in []byte, cp Compressor, compressor encoding.Compressor) ([]byte, error) {
+	if compressor == nil && cp == nil {
+		return nil, nil
+	}
+	wrapErr := func(err error) error {
+		return status.Errorf(codes.Internal, "grpc: error while compressing: %v", err.Error())
+	}
+	cbuf := &bytes.Buffer{}
+	if compressor != nil {
+		z, err := compressor.Compress(cbuf)
+		if err != nil {
+			return nil, wrapErr(err)
+		}
+		if _, err := z.Write(in); err != nil {
+			return nil, wrapErr(err)
+		}
+		if err := z.Close(); err != nil {
+			return nil, wrapErr(err)
+		}
+	} else {
+		if err := cp.Do(cbuf, in); err != nil {
+			return nil, wrapErr(err)
+		}
+	}
+	return cbuf.Bytes(), nil
+}
+
+const (
+	payloadLen = 1
+	sizeLen    = 4
+	headerLen  = payloadLen + sizeLen
+)
+
+// msgHeader returns a 5-byte header for the message being transmitted and the
+// payload, which is compData if non-nil or data otherwise.
+func msgHeader(data, compData []byte) (hdr []byte, payload []byte) {
+	hdr = make([]byte, headerLen)
+	if compData != nil {
+		hdr[0] = byte(compressionMade)
+		data = compData
+	} else {
+		hdr[0] = byte(compressionNone)
+	}
+
+	// Write length of payload into buf
+	binary.BigEndian.PutUint32(hdr[payloadLen:], uint32(len(data)))
+	return hdr, data
+}
+
+func outPayload(client bool, msg interface{}, data, payload []byte, t time.Time) *stats.OutPayload {
+	return &stats.OutPayload{
+		Client:     client,
+		Payload:    msg,
+		Data:       data,
+		Length:     len(data),
+		WireLength: len(payload) + headerLen,
+		SentTime:   t,
+	}
+}
+
+func checkRecvPayload(pf payloadFormat, recvCompress string, haveCompressor bool) *status.Status {
+	switch pf {
+	case compressionNone:
+	case compressionMade:
+		if recvCompress == "" || recvCompress == encoding.Identity {
+			return status.New(codes.Internal, "grpc: compressed flag set with identity or empty encoding")
+		}
+		if !haveCompressor {
+			return status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
+		}
+	default:
+		return status.Newf(codes.Internal, "grpc: received unexpected payload format %d", pf)
+	}
+	return nil
+}
+
+type payloadInfo struct {
+	wireLength        int // The compressed length got from wire.
+	uncompressedBytes []byte
+}
+
+func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxReceiveMessageSize int, payInfo *payloadInfo, compressor encoding.Compressor) ([]byte, error) {
+	pf, d, err := p.recvMsg(maxReceiveMessageSize)
+	if err != nil {
+		return nil, err
+	}
+	if payInfo != nil {
+		payInfo.wireLength = len(d)
+	}
+
+	if st := checkRecvPayload(pf, s.RecvCompress(), compressor != nil || dc != nil); st != nil {
+		return nil, st.Err()
+	}
+
+	var size int
+	if pf == compressionMade {
+		// To match legacy behavior, if the decompressor is set by WithDecompressor or RPCDecompressor,
+		// use this decompressor as the default.
+		if dc != nil {
+			d, err = dc.Do(bytes.NewReader(d))
+			size = len(d)
+		} else {
+			d, size, err = decompress(compressor, d, maxReceiveMessageSize)
+		}
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
+		}
+	} else {
+		size = len(d)
+	}
+	if size > maxReceiveMessageSize {
+		// TODO: Revisit the error code. Currently keep it consistent with java
+		// implementation.
+		return nil, status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", size, maxReceiveMessageSize)
+	}
+	return d, nil
+}
+
+// Using compressor, decompress d, returning data and size.
+// Optionally, if data will be over maxReceiveMessageSize, just return the size.
+func decompress(compressor encoding.Compressor, d []byte, maxReceiveMessageSize int) ([]byte, int, error) {
+	dcReader, err := compressor.Decompress(bytes.NewReader(d))
+	if err != nil {
+		return nil, 0, err
+	}
+	if sizer, ok := compressor.(interface {
+		DecompressedSize(compressedBytes []byte) int
+	}); ok {
+		if size := sizer.DecompressedSize(d); size >= 0 {
+			if size > maxReceiveMessageSize {
+				return nil, size, nil
+			}
+			// size is used as an estimate to size the buffer, but we
+			// will read more data if available.
+			// +MinRead so ReadFrom will not reallocate if size is correct.
+			buf := bytes.NewBuffer(make([]byte, 0, size+bytes.MinRead))
+			bytesRead, err := buf.ReadFrom(io.LimitReader(dcReader, int64(maxReceiveMessageSize)+1))
+			return buf.Bytes(), int(bytesRead), err
+		}
+	}
+	// Read from LimitReader with limit max+1. So if the underlying
+	// reader is over limit, the result will be bigger than max.
+	d, err = ioutil.ReadAll(io.LimitReader(dcReader, int64(maxReceiveMessageSize)+1))
+	return d, len(d), err
+}
+
+// For the two compressor parameters, both should not be set, but if they are,
+// dc takes precedence over compressor.
+// TODO(dfawley): wrap the old compressor/decompressor using the new API?
+func recv(p *parser, c baseCodec, s *transport.Stream, dc Decompressor, m interface{}, maxReceiveMessageSize int, payInfo *payloadInfo, compressor encoding.Compressor) error {
+	d, err := recvAndDecompress(p, s, dc, maxReceiveMessageSize, payInfo, compressor)
+	if err != nil {
+		return err
+	}
+	if err := c.Unmarshal(d, m); err != nil {
+		return status.Errorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
+	}
+	if payInfo != nil {
+		payInfo.uncompressedBytes = d
+	}
+	return nil
+}
+
+// Information about RPC
+type rpcInfo struct {
+	failfast      bool
+	preloaderInfo *compressorInfo
+}
+
+// Information about Preloader
+// Responsible for storing codec, and compressors
+// If stream (s) has  context s.Context which stores rpcInfo that has non nil
+// pointers to codec, and compressors, then we can use preparedMsg for Async message prep
+// and reuse marshalled bytes
+type compressorInfo struct {
+	codec baseCodec
+	cp    Compressor
+	comp  encoding.Compressor
+}
+
+type rpcInfoContextKey struct{}
+
+func newContextWithRPCInfo(ctx context.Context, failfast bool, codec baseCodec, cp Compressor, comp encoding.Compressor) context.Context {
+	return context.WithValue(ctx, rpcInfoContextKey{}, &rpcInfo{
+		failfast: failfast,
+		preloaderInfo: &compressorInfo{
+			codec: codec,
+			cp:    cp,
+			comp:  comp,
+		},
+	})
+}
+
+func rpcInfoFromContext(ctx context.Context) (s *rpcInfo, ok bool) {
+	s, ok = ctx.Value(rpcInfoContextKey{}).(*rpcInfo)
+	return
+}
+
+// Code returns the error code for err if it was produced by the rpc system.
+// Otherwise, it returns codes.Unknown.
+//
+// Deprecated: use status.Code instead.
+func Code(err error) codes.Code {
+	return status.Code(err)
+}
+
+// ErrorDesc returns the error description of err if it was produced by the rpc system.
+// Otherwise, it returns err.Error() or empty string when err is nil.
+//
+// Deprecated: use status.Convert and Message method instead.
+func ErrorDesc(err error) string {
+	return status.Convert(err).Message()
+}
+
+// Errorf returns an error containing an error code and a description;
+// Errorf returns nil if c is OK.
+//
+// Deprecated: use status.Errorf instead.
+func Errorf(c codes.Code, format string, a ...interface{}) error {
+	return status.Errorf(c, format, a...)
+}
+
+// toRPCErr converts an error into an error from the status package.
+func toRPCErr(err error) error {
+	if err == nil || err == io.EOF {
+		return err
+	}
+	if err == io.ErrUnexpectedEOF {
+		return status.Error(codes.Internal, err.Error())
+	}
+	if _, ok := status.FromError(err); ok {
+		return err
+	}
+	switch e := err.(type) {
+	case transport.ConnectionError:
+		return status.Error(codes.Unavailable, e.Desc)
+	default:
+		switch err {
+		case context.DeadlineExceeded:
+			return status.Error(codes.DeadlineExceeded, err.Error())
+		case context.Canceled:
+			return status.Error(codes.Canceled, err.Error())
+		}
+	}
+	return status.Error(codes.Unknown, err.Error())
+}
+
+// setCallInfoCodec should only be called after CallOptions have been applied.
+func setCallInfoCodec(c *callInfo) error {
+	if c.codec != nil {
+		// codec was already set by a CallOption; use it.
+		return nil
+	}
+
+	if c.contentSubtype == "" {
+		// No codec specified in CallOptions; use proto by default.
+		c.codec = encoding.GetCodec(proto.Name)
+		return nil
+	}
+
+	// c.contentSubtype is already lowercased in CallContentSubtype
+	c.codec = encoding.GetCodec(c.contentSubtype)
+	if c.codec == nil {
+		return status.Errorf(codes.Internal, "no codec registered for content-subtype %s", c.contentSubtype)
+	}
+	return nil
+}
+
+// parseDialTarget returns the network and address to pass to dialer
+func parseDialTarget(target string) (net string, addr string) {
+	net = "tcp"
+
+	m1 := strings.Index(target, ":")
+	m2 := strings.Index(target, ":/")
+
+	// handle unix:addr which will fail with url.Parse
+	if m1 >= 0 && m2 < 0 {
+		if n := target[0:m1]; n == "unix" {
+			net = n
+			addr = target[m1+1:]
+			return net, addr
+		}
+	}
+	if m2 >= 0 {
+		t, err := url.Parse(target)
+		if err != nil {
+			return net, target
+		}
+		scheme := t.Scheme
+		addr = t.Path
+		if scheme == "unix" {
+			net = scheme
+			if addr == "" {
+				addr = t.Host
+			}
+			return net, addr
+		}
+	}
+
+	return net, target
+}
+
+// channelzData is used to store channelz related data for ClientConn, addrConn and Server.
+// These fields cannot be embedded in the original structs (e.g. ClientConn), since to do atomic
+// operation on int64 variable on 32-bit machine, user is responsible to enforce memory alignment.
+// Here, by grouping those int64 fields inside a struct, we are enforcing the alignment.
+type channelzData struct {
+	callsStarted   int64
+	callsFailed    int64
+	callsSucceeded int64
+	// lastCallStartedTime stores the timestamp that last call starts. It is of int64 type instead of
+	// time.Time since it's more costly to atomically update time.Time variable than int64 variable.
+	lastCallStartedTime int64
+}
+
+// The SupportPackageIsVersion variables are referenced from generated protocol
+// buffer files to ensure compatibility with the gRPC version used.  The latest
+// support package version is 5.
+//
+// Older versions are kept for compatibility. They may be removed if
+// compatibility cannot be maintained.
+//
+// These constants should not be referenced from any other code.
+const (
+	SupportPackageIsVersion3 = true
+	SupportPackageIsVersion4 = true
+	SupportPackageIsVersion5 = true
+)
+
+const grpcUA = "grpc-go/" + Version
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
new file mode 100644
index 0000000..0d75cb1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/server.go
@@ -0,0 +1,1548 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"net/http"
+	"reflect"
+	"runtime"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"golang.org/x/net/trace"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/grpc/encoding/proto"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/binarylog"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/tap"
+)
+
+const (
+	defaultServerMaxReceiveMessageSize = 1024 * 1024 * 4
+	defaultServerMaxSendMessageSize    = math.MaxInt32
+)
+
+var statusOK = status.New(codes.OK, "")
+
+type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
+
+// MethodDesc represents an RPC service's method specification.
+type MethodDesc struct {
+	MethodName string
+	Handler    methodHandler
+}
+
+// ServiceDesc represents an RPC service's specification.
+type ServiceDesc struct {
+	ServiceName string
+	// The pointer to the service interface. Used to check whether the user
+	// provided implementation satisfies the interface requirements.
+	HandlerType interface{}
+	Methods     []MethodDesc
+	Streams     []StreamDesc
+	Metadata    interface{}
+}
+
+// service consists of the information of the server serving this service and
+// the methods in this service.
+type service struct {
+	server interface{} // the server for service methods
+	md     map[string]*MethodDesc
+	sd     map[string]*StreamDesc
+	mdata  interface{}
+}
+
+// Server is a gRPC server to serve RPC requests.
+type Server struct {
+	opts serverOptions
+
+	mu     sync.Mutex // guards following
+	lis    map[net.Listener]bool
+	conns  map[transport.ServerTransport]bool
+	serve  bool
+	drain  bool
+	cv     *sync.Cond          // signaled when connections close for GracefulStop
+	m      map[string]*service // service name -> service info
+	events trace.EventLog
+
+	quit               *grpcsync.Event
+	done               *grpcsync.Event
+	channelzRemoveOnce sync.Once
+	serveWG            sync.WaitGroup // counts active Serve goroutines for GracefulStop
+
+	channelzID int64 // channelz unique identification number
+	czData     *channelzData
+}
+
+type serverOptions struct {
+	creds                 credentials.TransportCredentials
+	codec                 baseCodec
+	cp                    Compressor
+	dc                    Decompressor
+	unaryInt              UnaryServerInterceptor
+	streamInt             StreamServerInterceptor
+	inTapHandle           tap.ServerInHandle
+	statsHandler          stats.Handler
+	maxConcurrentStreams  uint32
+	maxReceiveMessageSize int
+	maxSendMessageSize    int
+	unknownStreamDesc     *StreamDesc
+	keepaliveParams       keepalive.ServerParameters
+	keepalivePolicy       keepalive.EnforcementPolicy
+	initialWindowSize     int32
+	initialConnWindowSize int32
+	writeBufferSize       int
+	readBufferSize        int
+	connectionTimeout     time.Duration
+	maxHeaderListSize     *uint32
+	headerTableSize       *uint32
+}
+
+var defaultServerOptions = serverOptions{
+	maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
+	maxSendMessageSize:    defaultServerMaxSendMessageSize,
+	connectionTimeout:     120 * time.Second,
+	writeBufferSize:       defaultWriteBufSize,
+	readBufferSize:        defaultReadBufSize,
+}
+
+// A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
+type ServerOption interface {
+	apply(*serverOptions)
+}
+
+// EmptyServerOption does not alter the server configuration. It can be embedded
+// in another structure to build custom server options.
+//
+// This API is EXPERIMENTAL.
+type EmptyServerOption struct{}
+
+func (EmptyServerOption) apply(*serverOptions) {}
+
+// funcServerOption wraps a function that modifies serverOptions into an
+// implementation of the ServerOption interface.
+type funcServerOption struct {
+	f func(*serverOptions)
+}
+
+func (fdo *funcServerOption) apply(do *serverOptions) {
+	fdo.f(do)
+}
+
+func newFuncServerOption(f func(*serverOptions)) *funcServerOption {
+	return &funcServerOption{
+		f: f,
+	}
+}
+
+// WriteBufferSize determines how much data can be batched before doing a write on the wire.
+// The corresponding memory allocation for this buffer will be twice the size to keep syscalls low.
+// The default value for this buffer is 32KB.
+// Zero will disable the write buffer such that each write will be on underlying connection.
+// Note: A Send call may not directly translate to a write.
+func WriteBufferSize(s int) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.writeBufferSize = s
+	})
+}
+
+// ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most
+// for one read syscall.
+// The default value for this buffer is 32KB.
+// Zero will disable read buffer for a connection so data framer can access the underlying
+// conn directly.
+func ReadBufferSize(s int) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.readBufferSize = s
+	})
+}
+
+// InitialWindowSize returns a ServerOption that sets window size for stream.
+// The lower bound for window size is 64K and any value smaller than that will be ignored.
+func InitialWindowSize(s int32) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.initialWindowSize = s
+	})
+}
+
+// InitialConnWindowSize returns a ServerOption that sets window size for a connection.
+// The lower bound for window size is 64K and any value smaller than that will be ignored.
+func InitialConnWindowSize(s int32) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.initialConnWindowSize = s
+	})
+}
+
+// KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.
+func KeepaliveParams(kp keepalive.ServerParameters) ServerOption {
+	if kp.Time > 0 && kp.Time < time.Second {
+		grpclog.Warning("Adjusting keepalive ping interval to minimum period of 1s")
+		kp.Time = time.Second
+	}
+
+	return newFuncServerOption(func(o *serverOptions) {
+		o.keepaliveParams = kp
+	})
+}
+
+// KeepaliveEnforcementPolicy returns a ServerOption that sets keepalive enforcement policy for the server.
+func KeepaliveEnforcementPolicy(kep keepalive.EnforcementPolicy) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.keepalivePolicy = kep
+	})
+}
+
+// CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.
+//
+// This will override any lookups by content-subtype for Codecs registered with RegisterCodec.
+func CustomCodec(codec Codec) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.codec = codec
+	})
+}
+
+// RPCCompressor returns a ServerOption that sets a compressor for outbound
+// messages.  For backward compatibility, all outbound messages will be sent
+// using this compressor, regardless of incoming message compression.  By
+// default, server messages will be sent using the same compressor with which
+// request messages were sent.
+//
+// Deprecated: use encoding.RegisterCompressor instead.
+func RPCCompressor(cp Compressor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.cp = cp
+	})
+}
+
+// RPCDecompressor returns a ServerOption that sets a decompressor for inbound
+// messages.  It has higher priority than decompressors registered via
+// encoding.RegisterCompressor.
+//
+// Deprecated: use encoding.RegisterCompressor instead.
+func RPCDecompressor(dc Decompressor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.dc = dc
+	})
+}
+
+// MaxMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
+// If this is not set, gRPC uses the default limit.
+//
+// Deprecated: use MaxRecvMsgSize instead.
+func MaxMsgSize(m int) ServerOption {
+	return MaxRecvMsgSize(m)
+}
+
+// MaxRecvMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
+// If this is not set, gRPC uses the default 4MB.
+func MaxRecvMsgSize(m int) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.maxReceiveMessageSize = m
+	})
+}
+
+// MaxSendMsgSize returns a ServerOption to set the max message size in bytes the server can send.
+// If this is not set, gRPC uses the default `math.MaxInt32`.
+func MaxSendMsgSize(m int) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.maxSendMessageSize = m
+	})
+}
+
+// MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
+// of concurrent streams to each ServerTransport.
+func MaxConcurrentStreams(n uint32) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.maxConcurrentStreams = n
+	})
+}
+
+// Creds returns a ServerOption that sets credentials for server connections.
+func Creds(c credentials.TransportCredentials) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.creds = c
+	})
+}
+
+// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the
+// server. Only one unary interceptor can be installed. The construction of multiple
+// interceptors (e.g., chaining) can be implemented at the caller.
+func UnaryInterceptor(i UnaryServerInterceptor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		if o.unaryInt != nil {
+			panic("The unary server interceptor was already set and may not be reset.")
+		}
+		o.unaryInt = i
+	})
+}
+
+// StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the
+// server. Only one stream interceptor can be installed.
+func StreamInterceptor(i StreamServerInterceptor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		if o.streamInt != nil {
+			panic("The stream server interceptor was already set and may not be reset.")
+		}
+		o.streamInt = i
+	})
+}
+
+// InTapHandle returns a ServerOption that sets the tap handle for all the server
+// transport to be created. Only one can be installed.
+func InTapHandle(h tap.ServerInHandle) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		if o.inTapHandle != nil {
+			panic("The tap handle was already set and may not be reset.")
+		}
+		o.inTapHandle = h
+	})
+}
+
+// StatsHandler returns a ServerOption that sets the stats handler for the server.
+func StatsHandler(h stats.Handler) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.statsHandler = h
+	})
+}
+
+// UnknownServiceHandler returns a ServerOption that allows for adding a custom
+// unknown service handler. The provided method is a bidi-streaming RPC service
+// handler that will be invoked instead of returning the "unimplemented" gRPC
+// error whenever a request is received for an unregistered service or method.
+// The handling function and stream interceptor (if set) have full access to
+// the ServerStream, including its Context.
+func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.unknownStreamDesc = &StreamDesc{
+			StreamName: "unknown_service_handler",
+			Handler:    streamHandler,
+			// We need to assume that the users of the streamHandler will want to use both.
+			ClientStreams: true,
+			ServerStreams: true,
+		}
+	})
+}
+
+// ConnectionTimeout returns a ServerOption that sets the timeout for
+// connection establishment (up to and including HTTP/2 handshaking) for all
+// new connections.  If this is not set, the default is 120 seconds.  A zero or
+// negative value will result in an immediate timeout.
+//
+// This API is EXPERIMENTAL.
+func ConnectionTimeout(d time.Duration) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.connectionTimeout = d
+	})
+}
+
+// MaxHeaderListSize returns a ServerOption that sets the max (uncompressed) size
+// of header list that the server is prepared to accept.
+func MaxHeaderListSize(s uint32) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.maxHeaderListSize = &s
+	})
+}
+
+// HeaderTableSize returns a ServerOption that sets the size of dynamic
+// header table for stream.
+//
+// This API is EXPERIMENTAL.
+func HeaderTableSize(s uint32) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.headerTableSize = &s
+	})
+}
+
+// NewServer creates a gRPC server which has no service registered and has not
+// started to accept requests yet.
+func NewServer(opt ...ServerOption) *Server {
+	opts := defaultServerOptions
+	for _, o := range opt {
+		o.apply(&opts)
+	}
+	s := &Server{
+		lis:    make(map[net.Listener]bool),
+		opts:   opts,
+		conns:  make(map[transport.ServerTransport]bool),
+		m:      make(map[string]*service),
+		quit:   grpcsync.NewEvent(),
+		done:   grpcsync.NewEvent(),
+		czData: new(channelzData),
+	}
+	s.cv = sync.NewCond(&s.mu)
+	if EnableTracing {
+		_, file, line, _ := runtime.Caller(1)
+		s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
+	}
+
+	if channelz.IsOn() {
+		s.channelzID = channelz.RegisterServer(&channelzServer{s}, "")
+	}
+	return s
+}
+
+// printf records an event in s's event log, unless s has been stopped.
+// REQUIRES s.mu is held.
+func (s *Server) printf(format string, a ...interface{}) {
+	if s.events != nil {
+		s.events.Printf(format, a...)
+	}
+}
+
+// errorf records an error in s's event log, unless s has been stopped.
+// REQUIRES s.mu is held.
+func (s *Server) errorf(format string, a ...interface{}) {
+	if s.events != nil {
+		s.events.Errorf(format, a...)
+	}
+}
+
+// RegisterService registers a service and its implementation to the gRPC
+// server. It is called from the IDL generated code. This must be called before
+// invoking Serve.
+func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
+	ht := reflect.TypeOf(sd.HandlerType).Elem()
+	st := reflect.TypeOf(ss)
+	if !st.Implements(ht) {
+		grpclog.Fatalf("grpc: Server.RegisterService found the handler of type %v that does not satisfy %v", st, ht)
+	}
+	s.register(sd, ss)
+}
+
+func (s *Server) register(sd *ServiceDesc, ss interface{}) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.printf("RegisterService(%q)", sd.ServiceName)
+	if s.serve {
+		grpclog.Fatalf("grpc: Server.RegisterService after Server.Serve for %q", sd.ServiceName)
+	}
+	if _, ok := s.m[sd.ServiceName]; ok {
+		grpclog.Fatalf("grpc: Server.RegisterService found duplicate service registration for %q", sd.ServiceName)
+	}
+	srv := &service{
+		server: ss,
+		md:     make(map[string]*MethodDesc),
+		sd:     make(map[string]*StreamDesc),
+		mdata:  sd.Metadata,
+	}
+	for i := range sd.Methods {
+		d := &sd.Methods[i]
+		srv.md[d.MethodName] = d
+	}
+	for i := range sd.Streams {
+		d := &sd.Streams[i]
+		srv.sd[d.StreamName] = d
+	}
+	s.m[sd.ServiceName] = srv
+}
+
+// MethodInfo contains the information of an RPC including its method name and type.
+type MethodInfo struct {
+	// Name is the method name only, without the service name or package name.
+	Name string
+	// IsClientStream indicates whether the RPC is a client streaming RPC.
+	IsClientStream bool
+	// IsServerStream indicates whether the RPC is a server streaming RPC.
+	IsServerStream bool
+}
+
+// ServiceInfo contains unary RPC method info, streaming RPC method info and metadata for a service.
+type ServiceInfo struct {
+	Methods []MethodInfo
+	// Metadata is the metadata specified in ServiceDesc when registering service.
+	Metadata interface{}
+}
+
+// GetServiceInfo returns a map from service names to ServiceInfo.
+// Service names include the package names, in the form of <package>.<service>.
+func (s *Server) GetServiceInfo() map[string]ServiceInfo {
+	ret := make(map[string]ServiceInfo)
+	for n, srv := range s.m {
+		methods := make([]MethodInfo, 0, len(srv.md)+len(srv.sd))
+		for m := range srv.md {
+			methods = append(methods, MethodInfo{
+				Name:           m,
+				IsClientStream: false,
+				IsServerStream: false,
+			})
+		}
+		for m, d := range srv.sd {
+			methods = append(methods, MethodInfo{
+				Name:           m,
+				IsClientStream: d.ClientStreams,
+				IsServerStream: d.ServerStreams,
+			})
+		}
+
+		ret[n] = ServiceInfo{
+			Methods:  methods,
+			Metadata: srv.mdata,
+		}
+	}
+	return ret
+}
+
+// ErrServerStopped indicates that the operation is now illegal because of
+// the server being stopped.
+var ErrServerStopped = errors.New("grpc: the server has been stopped")
+
+func (s *Server) useTransportAuthenticator(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
+	if s.opts.creds == nil {
+		return rawConn, nil, nil
+	}
+	return s.opts.creds.ServerHandshake(rawConn)
+}
+
+type listenSocket struct {
+	net.Listener
+	channelzID int64
+}
+
+func (l *listenSocket) ChannelzMetric() *channelz.SocketInternalMetric {
+	return &channelz.SocketInternalMetric{
+		SocketOptions: channelz.GetSocketOption(l.Listener),
+		LocalAddr:     l.Listener.Addr(),
+	}
+}
+
+func (l *listenSocket) Close() error {
+	err := l.Listener.Close()
+	if channelz.IsOn() {
+		channelz.RemoveEntry(l.channelzID)
+	}
+	return err
+}
+
+// Serve accepts incoming connections on the listener lis, creating a new
+// ServerTransport and service goroutine for each. The service goroutines
+// read gRPC requests and then call the registered handlers to reply to them.
+// Serve returns when lis.Accept fails with fatal errors.  lis will be closed when
+// this method returns.
+// Serve will return a non-nil error unless Stop or GracefulStop is called.
+func (s *Server) Serve(lis net.Listener) error {
+	s.mu.Lock()
+	s.printf("serving")
+	s.serve = true
+	if s.lis == nil {
+		// Serve called after Stop or GracefulStop.
+		s.mu.Unlock()
+		lis.Close()
+		return ErrServerStopped
+	}
+
+	s.serveWG.Add(1)
+	defer func() {
+		s.serveWG.Done()
+		if s.quit.HasFired() {
+			// Stop or GracefulStop called; block until done and return nil.
+			<-s.done.Done()
+		}
+	}()
+
+	ls := &listenSocket{Listener: lis}
+	s.lis[ls] = true
+
+	if channelz.IsOn() {
+		ls.channelzID = channelz.RegisterListenSocket(ls, s.channelzID, lis.Addr().String())
+	}
+	s.mu.Unlock()
+
+	defer func() {
+		s.mu.Lock()
+		if s.lis != nil && s.lis[ls] {
+			ls.Close()
+			delete(s.lis, ls)
+		}
+		s.mu.Unlock()
+	}()
+
+	var tempDelay time.Duration // how long to sleep on accept failure
+
+	for {
+		rawConn, err := lis.Accept()
+		if err != nil {
+			if ne, ok := err.(interface {
+				Temporary() bool
+			}); ok && ne.Temporary() {
+				if tempDelay == 0 {
+					tempDelay = 5 * time.Millisecond
+				} else {
+					tempDelay *= 2
+				}
+				if max := 1 * time.Second; tempDelay > max {
+					tempDelay = max
+				}
+				s.mu.Lock()
+				s.printf("Accept error: %v; retrying in %v", err, tempDelay)
+				s.mu.Unlock()
+				timer := time.NewTimer(tempDelay)
+				select {
+				case <-timer.C:
+				case <-s.quit.Done():
+					timer.Stop()
+					return nil
+				}
+				continue
+			}
+			s.mu.Lock()
+			s.printf("done serving; Accept = %v", err)
+			s.mu.Unlock()
+
+			if s.quit.HasFired() {
+				return nil
+			}
+			return err
+		}
+		tempDelay = 0
+		// Start a new goroutine to deal with rawConn so we don't stall this Accept
+		// loop goroutine.
+		//
+		// Make sure we account for the goroutine so GracefulStop doesn't nil out
+		// s.conns before this conn can be added.
+		s.serveWG.Add(1)
+		go func() {
+			s.handleRawConn(rawConn)
+			s.serveWG.Done()
+		}()
+	}
+}
+
+// handleRawConn forks a goroutine to handle a just-accepted connection that
+// has not had any I/O performed on it yet.
+func (s *Server) handleRawConn(rawConn net.Conn) {
+	if s.quit.HasFired() {
+		rawConn.Close()
+		return
+	}
+	rawConn.SetDeadline(time.Now().Add(s.opts.connectionTimeout))
+	conn, authInfo, err := s.useTransportAuthenticator(rawConn)
+	if err != nil {
+		// ErrConnDispatched means that the connection was dispatched away from
+		// gRPC; those connections should be left open.
+		if err != credentials.ErrConnDispatched {
+			s.mu.Lock()
+			s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
+			s.mu.Unlock()
+			grpclog.Warningf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
+			rawConn.Close()
+		}
+		rawConn.SetDeadline(time.Time{})
+		return
+	}
+
+	// Finish handshaking (HTTP2)
+	st := s.newHTTP2Transport(conn, authInfo)
+	if st == nil {
+		return
+	}
+
+	rawConn.SetDeadline(time.Time{})
+	if !s.addConn(st) {
+		return
+	}
+	go func() {
+		s.serveStreams(st)
+		s.removeConn(st)
+	}()
+}
+
+// newHTTP2Transport sets up a http/2 transport (using the
+// gRPC http2 server transport in transport/http2_server.go).
+func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) transport.ServerTransport {
+	config := &transport.ServerConfig{
+		MaxStreams:            s.opts.maxConcurrentStreams,
+		AuthInfo:              authInfo,
+		InTapHandle:           s.opts.inTapHandle,
+		StatsHandler:          s.opts.statsHandler,
+		KeepaliveParams:       s.opts.keepaliveParams,
+		KeepalivePolicy:       s.opts.keepalivePolicy,
+		InitialWindowSize:     s.opts.initialWindowSize,
+		InitialConnWindowSize: s.opts.initialConnWindowSize,
+		WriteBufferSize:       s.opts.writeBufferSize,
+		ReadBufferSize:        s.opts.readBufferSize,
+		ChannelzParentID:      s.channelzID,
+		MaxHeaderListSize:     s.opts.maxHeaderListSize,
+		HeaderTableSize:       s.opts.headerTableSize,
+	}
+	st, err := transport.NewServerTransport("http2", c, config)
+	if err != nil {
+		s.mu.Lock()
+		s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
+		s.mu.Unlock()
+		c.Close()
+		grpclog.Warningln("grpc: Server.Serve failed to create ServerTransport: ", err)
+		return nil
+	}
+
+	return st
+}
+
+func (s *Server) serveStreams(st transport.ServerTransport) {
+	defer st.Close()
+	var wg sync.WaitGroup
+	st.HandleStreams(func(stream *transport.Stream) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			s.handleStream(st, stream, s.traceInfo(st, stream))
+		}()
+	}, func(ctx context.Context, method string) context.Context {
+		if !EnableTracing {
+			return ctx
+		}
+		tr := trace.New("grpc.Recv."+methodFamily(method), method)
+		return trace.NewContext(ctx, tr)
+	})
+	wg.Wait()
+}
+
+var _ http.Handler = (*Server)(nil)
+
+// ServeHTTP implements the Go standard library's http.Handler
+// interface by responding to the gRPC request r, by looking up
+// the requested gRPC method in the gRPC server s.
+//
+// The provided HTTP request must have arrived on an HTTP/2
+// connection. When using the Go standard library's server,
+// practically this means that the Request must also have arrived
+// over TLS.
+//
+// To share one port (such as 443 for https) between gRPC and an
+// existing http.Handler, use a root http.Handler such as:
+//
+//   if r.ProtoMajor == 2 && strings.HasPrefix(
+//   	r.Header.Get("Content-Type"), "application/grpc") {
+//   	grpcServer.ServeHTTP(w, r)
+//   } else {
+//   	yourMux.ServeHTTP(w, r)
+//   }
+//
+// Note that ServeHTTP uses Go's HTTP/2 server implementation which is totally
+// separate from grpc-go's HTTP/2 server. Performance and features may vary
+// between the two paths. ServeHTTP does not support some gRPC features
+// available through grpc-go's HTTP/2 server, and it is currently EXPERIMENTAL
+// and subject to change.
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandler)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if !s.addConn(st) {
+		return
+	}
+	defer s.removeConn(st)
+	s.serveStreams(st)
+}
+
+// traceInfo returns a traceInfo and associates it with stream, if tracing is enabled.
+// If tracing is not enabled, it returns nil.
+func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Stream) (trInfo *traceInfo) {
+	if !EnableTracing {
+		return nil
+	}
+	tr, ok := trace.FromContext(stream.Context())
+	if !ok {
+		return nil
+	}
+
+	trInfo = &traceInfo{
+		tr: tr,
+		firstLine: firstLine{
+			client:     false,
+			remoteAddr: st.RemoteAddr(),
+		},
+	}
+	if dl, ok := stream.Context().Deadline(); ok {
+		trInfo.firstLine.deadline = time.Until(dl)
+	}
+	return trInfo
+}
+
+func (s *Server) addConn(st transport.ServerTransport) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.conns == nil {
+		st.Close()
+		return false
+	}
+	if s.drain {
+		// Transport added after we drained our existing conns: drain it
+		// immediately.
+		st.Drain()
+	}
+	s.conns[st] = true
+	return true
+}
+
+func (s *Server) removeConn(st transport.ServerTransport) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.conns != nil {
+		delete(s.conns, st)
+		s.cv.Broadcast()
+	}
+}
+
+func (s *Server) channelzMetric() *channelz.ServerInternalMetric {
+	return &channelz.ServerInternalMetric{
+		CallsStarted:             atomic.LoadInt64(&s.czData.callsStarted),
+		CallsSucceeded:           atomic.LoadInt64(&s.czData.callsSucceeded),
+		CallsFailed:              atomic.LoadInt64(&s.czData.callsFailed),
+		LastCallStartedTimestamp: time.Unix(0, atomic.LoadInt64(&s.czData.lastCallStartedTime)),
+	}
+}
+
+func (s *Server) incrCallsStarted() {
+	atomic.AddInt64(&s.czData.callsStarted, 1)
+	atomic.StoreInt64(&s.czData.lastCallStartedTime, time.Now().UnixNano())
+}
+
+func (s *Server) incrCallsSucceeded() {
+	atomic.AddInt64(&s.czData.callsSucceeded, 1)
+}
+
+func (s *Server) incrCallsFailed() {
+	atomic.AddInt64(&s.czData.callsFailed, 1)
+}
+
+func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options, comp encoding.Compressor) error {
+	data, err := encode(s.getCodec(stream.ContentSubtype()), msg)
+	if err != nil {
+		grpclog.Errorln("grpc: server failed to encode response: ", err)
+		return err
+	}
+	compData, err := compress(data, cp, comp)
+	if err != nil {
+		grpclog.Errorln("grpc: server failed to compress response: ", err)
+		return err
+	}
+	hdr, payload := msgHeader(data, compData)
+	// TODO(dfawley): should we be checking len(data) instead?
+	if len(payload) > s.opts.maxSendMessageSize {
+		return status.Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(payload), s.opts.maxSendMessageSize)
+	}
+	err = t.Write(stream, hdr, payload, opts)
+	if err == nil && s.opts.statsHandler != nil {
+		s.opts.statsHandler.HandleRPC(stream.Context(), outPayload(false, msg, data, payload, time.Now()))
+	}
+	return err
+}
+
+func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, trInfo *traceInfo) (err error) {
+	sh := s.opts.statsHandler
+	if sh != nil || trInfo != nil || channelz.IsOn() {
+		if channelz.IsOn() {
+			s.incrCallsStarted()
+		}
+		var statsBegin *stats.Begin
+		if sh != nil {
+			beginTime := time.Now()
+			statsBegin = &stats.Begin{
+				BeginTime: beginTime,
+			}
+			sh.HandleRPC(stream.Context(), statsBegin)
+		}
+		if trInfo != nil {
+			trInfo.tr.LazyLog(&trInfo.firstLine, false)
+		}
+		// The deferred error handling for tracing, stats handler and channelz are
+		// combined into one function to reduce stack usage -- a defer takes ~56-64
+		// bytes on the stack, so overflowing the stack will require a stack
+		// re-allocation, which is expensive.
+		//
+		// To maintain behavior similar to separate deferred statements, statements
+		// should be executed in the reverse order. That is, tracing first, stats
+		// handler second, and channelz last. Note that panics *within* defers will
+		// lead to different behavior, but that's an acceptable compromise; that
+		// would be undefined behavior territory anyway.
+		defer func() {
+			if trInfo != nil {
+				if err != nil && err != io.EOF {
+					trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					trInfo.tr.SetError()
+				}
+				trInfo.tr.Finish()
+			}
+
+			if sh != nil {
+				end := &stats.End{
+					BeginTime: statsBegin.BeginTime,
+					EndTime:   time.Now(),
+				}
+				if err != nil && err != io.EOF {
+					end.Error = toRPCErr(err)
+				}
+				sh.HandleRPC(stream.Context(), end)
+			}
+
+			if channelz.IsOn() {
+				if err != nil && err != io.EOF {
+					s.incrCallsFailed()
+				} else {
+					s.incrCallsSucceeded()
+				}
+			}
+		}()
+	}
+
+	binlog := binarylog.GetMethodLogger(stream.Method())
+	if binlog != nil {
+		ctx := stream.Context()
+		md, _ := metadata.FromIncomingContext(ctx)
+		logEntry := &binarylog.ClientHeader{
+			Header:     md,
+			MethodName: stream.Method(),
+			PeerAddr:   nil,
+		}
+		if deadline, ok := ctx.Deadline(); ok {
+			logEntry.Timeout = time.Until(deadline)
+			if logEntry.Timeout < 0 {
+				logEntry.Timeout = 0
+			}
+		}
+		if a := md[":authority"]; len(a) > 0 {
+			logEntry.Authority = a[0]
+		}
+		if peer, ok := peer.FromContext(ctx); ok {
+			logEntry.PeerAddr = peer.Addr
+		}
+		binlog.Log(logEntry)
+	}
+
+	// comp and cp are used for compression.  decomp and dc are used for
+	// decompression.  If comp and decomp are both set, they are the same;
+	// however they are kept separate to ensure that at most one of the
+	// compressor/decompressor variable pairs are set for use later.
+	var comp, decomp encoding.Compressor
+	var cp Compressor
+	var dc Decompressor
+
+	// If dc is set and matches the stream's compression, use it.  Otherwise, try
+	// to find a matching registered compressor for decomp.
+	if rc := stream.RecvCompress(); s.opts.dc != nil && s.opts.dc.Type() == rc {
+		dc = s.opts.dc
+	} else if rc != "" && rc != encoding.Identity {
+		decomp = encoding.GetCompressor(rc)
+		if decomp == nil {
+			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
+			t.WriteStatus(stream, st)
+			return st.Err()
+		}
+	}
+
+	// If cp is set, use it.  Otherwise, attempt to compress the response using
+	// the incoming message compression method.
+	//
+	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
+	if s.opts.cp != nil {
+		cp = s.opts.cp
+		stream.SetSendCompress(cp.Type())
+	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
+		// Legacy compressor not specified; attempt to respond with same encoding.
+		comp = encoding.GetCompressor(rc)
+		if comp != nil {
+			stream.SetSendCompress(rc)
+		}
+	}
+
+	var payInfo *payloadInfo
+	if sh != nil || binlog != nil {
+		payInfo = &payloadInfo{}
+	}
+	d, err := recvAndDecompress(&parser{r: stream}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
+	if err != nil {
+		if st, ok := status.FromError(err); ok {
+			if e := t.WriteStatus(stream, st); e != nil {
+				grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
+			}
+		}
+		return err
+	}
+	if channelz.IsOn() {
+		t.IncrMsgRecv()
+	}
+	df := func(v interface{}) error {
+		if err := s.getCodec(stream.ContentSubtype()).Unmarshal(d, v); err != nil {
+			return status.Errorf(codes.Internal, "grpc: error unmarshalling request: %v", err)
+		}
+		if sh != nil {
+			sh.HandleRPC(stream.Context(), &stats.InPayload{
+				RecvTime:   time.Now(),
+				Payload:    v,
+				WireLength: payInfo.wireLength,
+				Data:       d,
+				Length:     len(d),
+			})
+		}
+		if binlog != nil {
+			binlog.Log(&binarylog.ClientMessage{
+				Message: d,
+			})
+		}
+		if trInfo != nil {
+			trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
+		}
+		return nil
+	}
+	ctx := NewContextWithServerTransportStream(stream.Context(), stream)
+	reply, appErr := md.Handler(srv.server, ctx, df, s.opts.unaryInt)
+	if appErr != nil {
+		appStatus, ok := status.FromError(appErr)
+		if !ok {
+			// Convert appErr if it is not a grpc status error.
+			appErr = status.Error(codes.Unknown, appErr.Error())
+			appStatus, _ = status.FromError(appErr)
+		}
+		if trInfo != nil {
+			trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
+			trInfo.tr.SetError()
+		}
+		if e := t.WriteStatus(stream, appStatus); e != nil {
+			grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
+		}
+		if binlog != nil {
+			if h, _ := stream.Header(); h.Len() > 0 {
+				// Only log serverHeader if there was header. Otherwise it can
+				// be trailer only.
+				binlog.Log(&binarylog.ServerHeader{
+					Header: h,
+				})
+			}
+			binlog.Log(&binarylog.ServerTrailer{
+				Trailer: stream.Trailer(),
+				Err:     appErr,
+			})
+		}
+		return appErr
+	}
+	if trInfo != nil {
+		trInfo.tr.LazyLog(stringer("OK"), false)
+	}
+	opts := &transport.Options{Last: true}
+
+	if err := s.sendResponse(t, stream, reply, cp, opts, comp); err != nil {
+		if err == io.EOF {
+			// The entire stream is done (for unary RPC only).
+			return err
+		}
+		if s, ok := status.FromError(err); ok {
+			if e := t.WriteStatus(stream, s); e != nil {
+				grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
+			}
+		} else {
+			switch st := err.(type) {
+			case transport.ConnectionError:
+				// Nothing to do here.
+			default:
+				panic(fmt.Sprintf("grpc: Unexpected error (%T) from sendResponse: %v", st, st))
+			}
+		}
+		if binlog != nil {
+			h, _ := stream.Header()
+			binlog.Log(&binarylog.ServerHeader{
+				Header: h,
+			})
+			binlog.Log(&binarylog.ServerTrailer{
+				Trailer: stream.Trailer(),
+				Err:     appErr,
+			})
+		}
+		return err
+	}
+	if binlog != nil {
+		h, _ := stream.Header()
+		binlog.Log(&binarylog.ServerHeader{
+			Header: h,
+		})
+		binlog.Log(&binarylog.ServerMessage{
+			Message: reply,
+		})
+	}
+	if channelz.IsOn() {
+		t.IncrMsgSent()
+	}
+	if trInfo != nil {
+		trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
+	}
+	// TODO: Should we be logging if writing status failed here, like above?
+	// Should the logging be in WriteStatus?  Should we ignore the WriteStatus
+	// error or allow the stats handler to see it?
+	err = t.WriteStatus(stream, statusOK)
+	if binlog != nil {
+		binlog.Log(&binarylog.ServerTrailer{
+			Trailer: stream.Trailer(),
+			Err:     appErr,
+		})
+	}
+	return err
+}
+
+func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
+	if channelz.IsOn() {
+		s.incrCallsStarted()
+	}
+	sh := s.opts.statsHandler
+	var statsBegin *stats.Begin
+	if sh != nil {
+		beginTime := time.Now()
+		statsBegin = &stats.Begin{
+			BeginTime: beginTime,
+		}
+		sh.HandleRPC(stream.Context(), statsBegin)
+	}
+	ctx := NewContextWithServerTransportStream(stream.Context(), stream)
+	ss := &serverStream{
+		ctx:                   ctx,
+		t:                     t,
+		s:                     stream,
+		p:                     &parser{r: stream},
+		codec:                 s.getCodec(stream.ContentSubtype()),
+		maxReceiveMessageSize: s.opts.maxReceiveMessageSize,
+		maxSendMessageSize:    s.opts.maxSendMessageSize,
+		trInfo:                trInfo,
+		statsHandler:          sh,
+	}
+
+	if sh != nil || trInfo != nil || channelz.IsOn() {
+		// See comment in processUnaryRPC on defers.
+		defer func() {
+			if trInfo != nil {
+				ss.mu.Lock()
+				if err != nil && err != io.EOF {
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.SetError()
+				}
+				ss.trInfo.tr.Finish()
+				ss.trInfo.tr = nil
+				ss.mu.Unlock()
+			}
+
+			if sh != nil {
+				end := &stats.End{
+					BeginTime: statsBegin.BeginTime,
+					EndTime:   time.Now(),
+				}
+				if err != nil && err != io.EOF {
+					end.Error = toRPCErr(err)
+				}
+				sh.HandleRPC(stream.Context(), end)
+			}
+
+			if channelz.IsOn() {
+				if err != nil && err != io.EOF {
+					s.incrCallsFailed()
+				} else {
+					s.incrCallsSucceeded()
+				}
+			}
+		}()
+	}
+
+	ss.binlog = binarylog.GetMethodLogger(stream.Method())
+	if ss.binlog != nil {
+		md, _ := metadata.FromIncomingContext(ctx)
+		logEntry := &binarylog.ClientHeader{
+			Header:     md,
+			MethodName: stream.Method(),
+			PeerAddr:   nil,
+		}
+		if deadline, ok := ctx.Deadline(); ok {
+			logEntry.Timeout = time.Until(deadline)
+			if logEntry.Timeout < 0 {
+				logEntry.Timeout = 0
+			}
+		}
+		if a := md[":authority"]; len(a) > 0 {
+			logEntry.Authority = a[0]
+		}
+		if peer, ok := peer.FromContext(ss.Context()); ok {
+			logEntry.PeerAddr = peer.Addr
+		}
+		ss.binlog.Log(logEntry)
+	}
+
+	// If dc is set and matches the stream's compression, use it.  Otherwise, try
+	// to find a matching registered compressor for decomp.
+	if rc := stream.RecvCompress(); s.opts.dc != nil && s.opts.dc.Type() == rc {
+		ss.dc = s.opts.dc
+	} else if rc != "" && rc != encoding.Identity {
+		ss.decomp = encoding.GetCompressor(rc)
+		if ss.decomp == nil {
+			st := status.Newf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", rc)
+			t.WriteStatus(ss.s, st)
+			return st.Err()
+		}
+	}
+
+	// If cp is set, use it.  Otherwise, attempt to compress the response using
+	// the incoming message compression method.
+	//
+	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
+	if s.opts.cp != nil {
+		ss.cp = s.opts.cp
+		stream.SetSendCompress(s.opts.cp.Type())
+	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
+		// Legacy compressor not specified; attempt to respond with same encoding.
+		ss.comp = encoding.GetCompressor(rc)
+		if ss.comp != nil {
+			stream.SetSendCompress(rc)
+		}
+	}
+
+	if trInfo != nil {
+		trInfo.tr.LazyLog(&trInfo.firstLine, false)
+	}
+	var appErr error
+	var server interface{}
+	if srv != nil {
+		server = srv.server
+	}
+	if s.opts.streamInt == nil {
+		appErr = sd.Handler(server, ss)
+	} else {
+		info := &StreamServerInfo{
+			FullMethod:     stream.Method(),
+			IsClientStream: sd.ClientStreams,
+			IsServerStream: sd.ServerStreams,
+		}
+		appErr = s.opts.streamInt(server, ss, info, sd.Handler)
+	}
+	if appErr != nil {
+		appStatus, ok := status.FromError(appErr)
+		if !ok {
+			appStatus = status.New(codes.Unknown, appErr.Error())
+			appErr = appStatus.Err()
+		}
+		if trInfo != nil {
+			ss.mu.Lock()
+			ss.trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
+			ss.trInfo.tr.SetError()
+			ss.mu.Unlock()
+		}
+		t.WriteStatus(ss.s, appStatus)
+		if ss.binlog != nil {
+			ss.binlog.Log(&binarylog.ServerTrailer{
+				Trailer: ss.s.Trailer(),
+				Err:     appErr,
+			})
+		}
+		// TODO: Should we log an error from WriteStatus here and below?
+		return appErr
+	}
+	if trInfo != nil {
+		ss.mu.Lock()
+		ss.trInfo.tr.LazyLog(stringer("OK"), false)
+		ss.mu.Unlock()
+	}
+	err = t.WriteStatus(ss.s, statusOK)
+	if ss.binlog != nil {
+		ss.binlog.Log(&binarylog.ServerTrailer{
+			Trailer: ss.s.Trailer(),
+			Err:     appErr,
+		})
+	}
+	return err
+}
+
+func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream, trInfo *traceInfo) {
+	sm := stream.Method()
+	if sm != "" && sm[0] == '/' {
+		sm = sm[1:]
+	}
+	pos := strings.LastIndex(sm, "/")
+	if pos == -1 {
+		if trInfo != nil {
+			trInfo.tr.LazyLog(&fmtStringer{"Malformed method name %q", []interface{}{sm}}, true)
+			trInfo.tr.SetError()
+		}
+		errDesc := fmt.Sprintf("malformed method name: %q", stream.Method())
+		if err := t.WriteStatus(stream, status.New(codes.ResourceExhausted, errDesc)); err != nil {
+			if trInfo != nil {
+				trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+				trInfo.tr.SetError()
+			}
+			grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
+		}
+		if trInfo != nil {
+			trInfo.tr.Finish()
+		}
+		return
+	}
+	service := sm[:pos]
+	method := sm[pos+1:]
+
+	srv, knownService := s.m[service]
+	if knownService {
+		if md, ok := srv.md[method]; ok {
+			s.processUnaryRPC(t, stream, srv, md, trInfo)
+			return
+		}
+		if sd, ok := srv.sd[method]; ok {
+			s.processStreamingRPC(t, stream, srv, sd, trInfo)
+			return
+		}
+	}
+	// Unknown service, or known server unknown method.
+	if unknownDesc := s.opts.unknownStreamDesc; unknownDesc != nil {
+		s.processStreamingRPC(t, stream, nil, unknownDesc, trInfo)
+		return
+	}
+	var errDesc string
+	if !knownService {
+		errDesc = fmt.Sprintf("unknown service %v", service)
+	} else {
+		errDesc = fmt.Sprintf("unknown method %v for service %v", method, service)
+	}
+	if trInfo != nil {
+		trInfo.tr.LazyPrintf("%s", errDesc)
+		trInfo.tr.SetError()
+	}
+	if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
+		if trInfo != nil {
+			trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+			trInfo.tr.SetError()
+		}
+		grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
+	}
+	if trInfo != nil {
+		trInfo.tr.Finish()
+	}
+}
+
+// The key to save ServerTransportStream in the context.
+type streamKey struct{}
+
+// NewContextWithServerTransportStream creates a new context from ctx and
+// attaches stream to it.
+//
+// This API is EXPERIMENTAL.
+func NewContextWithServerTransportStream(ctx context.Context, stream ServerTransportStream) context.Context {
+	return context.WithValue(ctx, streamKey{}, stream)
+}
+
+// ServerTransportStream is a minimal interface that a transport stream must
+// implement. This can be used to mock an actual transport stream for tests of
+// handler code that use, for example, grpc.SetHeader (which requires some
+// stream to be in context).
+//
+// See also NewContextWithServerTransportStream.
+//
+// This API is EXPERIMENTAL.
+type ServerTransportStream interface {
+	Method() string
+	SetHeader(md metadata.MD) error
+	SendHeader(md metadata.MD) error
+	SetTrailer(md metadata.MD) error
+}
+
+// ServerTransportStreamFromContext returns the ServerTransportStream saved in
+// ctx. Returns nil if the given context has no stream associated with it
+// (which implies it is not an RPC invocation context).
+//
+// This API is EXPERIMENTAL.
+func ServerTransportStreamFromContext(ctx context.Context) ServerTransportStream {
+	s, _ := ctx.Value(streamKey{}).(ServerTransportStream)
+	return s
+}
+
+// Stop stops the gRPC server. It immediately closes all open
+// connections and listeners.
+// It cancels all active RPCs on the server side and the corresponding
+// pending RPCs on the client side will get notified by connection
+// errors.
+func (s *Server) Stop() {
+	s.quit.Fire()
+
+	defer func() {
+		s.serveWG.Wait()
+		s.done.Fire()
+	}()
+
+	s.channelzRemoveOnce.Do(func() {
+		if channelz.IsOn() {
+			channelz.RemoveEntry(s.channelzID)
+		}
+	})
+
+	s.mu.Lock()
+	listeners := s.lis
+	s.lis = nil
+	st := s.conns
+	s.conns = nil
+	// interrupt GracefulStop if Stop and GracefulStop are called concurrently.
+	s.cv.Broadcast()
+	s.mu.Unlock()
+
+	for lis := range listeners {
+		lis.Close()
+	}
+	for c := range st {
+		c.Close()
+	}
+
+	s.mu.Lock()
+	if s.events != nil {
+		s.events.Finish()
+		s.events = nil
+	}
+	s.mu.Unlock()
+}
+
+// GracefulStop stops the gRPC server gracefully. It stops the server from
+// accepting new connections and RPCs and blocks until all the pending RPCs are
+// finished.
+func (s *Server) GracefulStop() {
+	s.quit.Fire()
+	defer s.done.Fire()
+
+	s.channelzRemoveOnce.Do(func() {
+		if channelz.IsOn() {
+			channelz.RemoveEntry(s.channelzID)
+		}
+	})
+	s.mu.Lock()
+	if s.conns == nil {
+		s.mu.Unlock()
+		return
+	}
+
+	for lis := range s.lis {
+		lis.Close()
+	}
+	s.lis = nil
+	if !s.drain {
+		for st := range s.conns {
+			st.Drain()
+		}
+		s.drain = true
+	}
+
+	// Wait for serving threads to be ready to exit.  Only then can we be sure no
+	// new conns will be created.
+	s.mu.Unlock()
+	s.serveWG.Wait()
+	s.mu.Lock()
+
+	for len(s.conns) != 0 {
+		s.cv.Wait()
+	}
+	s.conns = nil
+	if s.events != nil {
+		s.events.Finish()
+		s.events = nil
+	}
+	s.mu.Unlock()
+}
+
+// contentSubtype must be lowercase
+// cannot return nil
+func (s *Server) getCodec(contentSubtype string) baseCodec {
+	if s.opts.codec != nil {
+		return s.opts.codec
+	}
+	if contentSubtype == "" {
+		return encoding.GetCodec(proto.Name)
+	}
+	codec := encoding.GetCodec(contentSubtype)
+	if codec == nil {
+		return encoding.GetCodec(proto.Name)
+	}
+	return codec
+}
+
+// SetHeader sets the header metadata.
+// When called multiple times, all the provided metadata will be merged.
+// All the metadata will be sent out when one of the following happens:
+//  - grpc.SendHeader() is called;
+//  - The first response is sent out;
+//  - An RPC status is sent out (error or success).
+func SetHeader(ctx context.Context, md metadata.MD) error {
+	if md.Len() == 0 {
+		return nil
+	}
+	stream := ServerTransportStreamFromContext(ctx)
+	if stream == nil {
+		return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
+	}
+	return stream.SetHeader(md)
+}
+
+// SendHeader sends header metadata. It may be called at most once.
+// The provided md and headers set by SetHeader() will be sent.
+func SendHeader(ctx context.Context, md metadata.MD) error {
+	stream := ServerTransportStreamFromContext(ctx)
+	if stream == nil {
+		return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
+	}
+	if err := stream.SendHeader(md); err != nil {
+		return toRPCErr(err)
+	}
+	return nil
+}
+
+// SetTrailer sets the trailer metadata that will be sent when an RPC returns.
+// When called more than once, all the provided metadata will be merged.
+func SetTrailer(ctx context.Context, md metadata.MD) error {
+	if md.Len() == 0 {
+		return nil
+	}
+	stream := ServerTransportStreamFromContext(ctx)
+	if stream == nil {
+		return status.Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
+	}
+	return stream.SetTrailer(md)
+}
+
+// Method returns the method string for the server context.  The returned
+// string is in the format of "/service/method".
+func Method(ctx context.Context) (string, bool) {
+	s := ServerTransportStreamFromContext(ctx)
+	if s == nil {
+		return "", false
+	}
+	return s.Method(), true
+}
+
+type channelzServer struct {
+	s *Server
+}
+
+func (c *channelzServer) ChannelzMetric() *channelz.ServerInternalMetric {
+	return c.s.channelzMetric()
+}
diff --git a/vendor/google.golang.org/grpc/service_config.go b/vendor/google.golang.org/grpc/service_config.go
new file mode 100644
index 0000000..4f8836d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/service_config.go
@@ -0,0 +1,434 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+const maxInt = int(^uint(0) >> 1)
+
+// MethodConfig defines the configuration recommended by the service providers for a
+// particular method.
+//
+// Deprecated: Users should not use this struct. Service config should be received
+// through name resolver, as specified here
+// https://github.com/grpc/grpc/blob/master/doc/service_config.md
+type MethodConfig struct {
+	// WaitForReady indicates whether RPCs sent to this method should wait until
+	// the connection is ready by default (!failfast). The value specified via the
+	// gRPC client API will override the value set here.
+	WaitForReady *bool
+	// Timeout is the default timeout for RPCs sent to this method. The actual
+	// deadline used will be the minimum of the value specified here and the value
+	// set by the application via the gRPC client API.  If either one is not set,
+	// then the other will be used.  If neither is set, then the RPC has no deadline.
+	Timeout *time.Duration
+	// MaxReqSize is the maximum allowed payload size for an individual request in a
+	// stream (client->server) in bytes. The size which is measured is the serialized
+	// payload after per-message compression (but before stream compression) in bytes.
+	// The actual value used is the minimum of the value specified here and the value set
+	// by the application via the gRPC client API. If either one is not set, then the other
+	// will be used.  If neither is set, then the built-in default is used.
+	MaxReqSize *int
+	// MaxRespSize is the maximum allowed payload size for an individual response in a
+	// stream (server->client) in bytes.
+	MaxRespSize *int
+	// RetryPolicy configures retry options for the method.
+	retryPolicy *retryPolicy
+}
+
+type lbConfig struct {
+	name string
+	cfg  serviceconfig.LoadBalancingConfig
+}
+
+// ServiceConfig is provided by the service provider and contains parameters for how
+// clients that connect to the service should behave.
+//
+// Deprecated: Users should not use this struct. Service config should be received
+// through name resolver, as specified here
+// https://github.com/grpc/grpc/blob/master/doc/service_config.md
+type ServiceConfig struct {
+	serviceconfig.Config
+
+	// LB is the load balancer the service providers recommends. The balancer
+	// specified via grpc.WithBalancer will override this.  This is deprecated;
+	// lbConfigs is preferred.  If lbConfig and LB are both present, lbConfig
+	// will be used.
+	LB *string
+
+	// lbConfig is the service config's load balancing configuration.  If
+	// lbConfig and LB are both present, lbConfig will be used.
+	lbConfig *lbConfig
+
+	// Methods contains a map for the methods in this service.  If there is an
+	// exact match for a method (i.e. /service/method) in the map, use the
+	// corresponding MethodConfig.  If there's no exact match, look for the
+	// default config for the service (/service/) and use the corresponding
+	// MethodConfig if it exists.  Otherwise, the method has no MethodConfig to
+	// use.
+	Methods map[string]MethodConfig
+
+	// If a retryThrottlingPolicy is provided, gRPC will automatically throttle
+	// retry attempts and hedged RPCs when the client’s ratio of failures to
+	// successes exceeds a threshold.
+	//
+	// For each server name, the gRPC client will maintain a token_count which is
+	// initially set to maxTokens, and can take values between 0 and maxTokens.
+	//
+	// Every outgoing RPC (regardless of service or method invoked) will change
+	// token_count as follows:
+	//
+	//   - Every failed RPC will decrement the token_count by 1.
+	//   - Every successful RPC will increment the token_count by tokenRatio.
+	//
+	// If token_count is less than or equal to maxTokens / 2, then RPCs will not
+	// be retried and hedged RPCs will not be sent.
+	retryThrottling *retryThrottlingPolicy
+	// healthCheckConfig must be set as one of the requirement to enable LB channel
+	// health check.
+	healthCheckConfig *healthCheckConfig
+	// rawJSONString stores service config json string that get parsed into
+	// this service config struct.
+	rawJSONString string
+}
+
+// healthCheckConfig defines the go-native version of the LB channel health check config.
+type healthCheckConfig struct {
+	// serviceName is the service name to use in the health-checking request.
+	ServiceName string
+}
+
+// retryPolicy defines the go-native version of the retry policy defined by the
+// service config here:
+// https://github.com/grpc/proposal/blob/master/A6-client-retries.md#integration-with-service-config
+type retryPolicy struct {
+	// MaxAttempts is the maximum number of attempts, including the original RPC.
+	//
+	// This field is required and must be two or greater.
+	maxAttempts int
+
+	// Exponential backoff parameters. The initial retry attempt will occur at
+	// random(0, initialBackoffMS). In general, the nth attempt will occur at
+	// random(0,
+	//   min(initialBackoffMS*backoffMultiplier**(n-1), maxBackoffMS)).
+	//
+	// These fields are required and must be greater than zero.
+	initialBackoff    time.Duration
+	maxBackoff        time.Duration
+	backoffMultiplier float64
+
+	// The set of status codes which may be retried.
+	//
+	// Status codes are specified as strings, e.g., "UNAVAILABLE".
+	//
+	// This field is required and must be non-empty.
+	// Note: a set is used to store this for easy lookup.
+	retryableStatusCodes map[codes.Code]bool
+}
+
+type jsonRetryPolicy struct {
+	MaxAttempts          int
+	InitialBackoff       string
+	MaxBackoff           string
+	BackoffMultiplier    float64
+	RetryableStatusCodes []codes.Code
+}
+
+// retryThrottlingPolicy defines the go-native version of the retry throttling
+// policy defined by the service config here:
+// https://github.com/grpc/proposal/blob/master/A6-client-retries.md#integration-with-service-config
+type retryThrottlingPolicy struct {
+	// The number of tokens starts at maxTokens. The token_count will always be
+	// between 0 and maxTokens.
+	//
+	// This field is required and must be greater than zero.
+	MaxTokens float64
+	// The amount of tokens to add on each successful RPC. Typically this will
+	// be some number between 0 and 1, e.g., 0.1.
+	//
+	// This field is required and must be greater than zero. Up to 3 decimal
+	// places are supported.
+	TokenRatio float64
+}
+
+func parseDuration(s *string) (*time.Duration, error) {
+	if s == nil {
+		return nil, nil
+	}
+	if !strings.HasSuffix(*s, "s") {
+		return nil, fmt.Errorf("malformed duration %q", *s)
+	}
+	ss := strings.SplitN((*s)[:len(*s)-1], ".", 3)
+	if len(ss) > 2 {
+		return nil, fmt.Errorf("malformed duration %q", *s)
+	}
+	// hasDigits is set if either the whole or fractional part of the number is
+	// present, since both are optional but one is required.
+	hasDigits := false
+	var d time.Duration
+	if len(ss[0]) > 0 {
+		i, err := strconv.ParseInt(ss[0], 10, 32)
+		if err != nil {
+			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
+		}
+		d = time.Duration(i) * time.Second
+		hasDigits = true
+	}
+	if len(ss) == 2 && len(ss[1]) > 0 {
+		if len(ss[1]) > 9 {
+			return nil, fmt.Errorf("malformed duration %q", *s)
+		}
+		f, err := strconv.ParseInt(ss[1], 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
+		}
+		for i := 9; i > len(ss[1]); i-- {
+			f *= 10
+		}
+		d += time.Duration(f)
+		hasDigits = true
+	}
+	if !hasDigits {
+		return nil, fmt.Errorf("malformed duration %q", *s)
+	}
+
+	return &d, nil
+}
+
+type jsonName struct {
+	Service *string
+	Method  *string
+}
+
+func (j jsonName) generatePath() (string, bool) {
+	if j.Service == nil {
+		return "", false
+	}
+	res := "/" + *j.Service + "/"
+	if j.Method != nil {
+		res += *j.Method
+	}
+	return res, true
+}
+
+// TODO(lyuxuan): delete this struct after cleaning up old service config implementation.
+type jsonMC struct {
+	Name                    *[]jsonName
+	WaitForReady            *bool
+	Timeout                 *string
+	MaxRequestMessageBytes  *int64
+	MaxResponseMessageBytes *int64
+	RetryPolicy             *jsonRetryPolicy
+}
+
+type loadBalancingConfig map[string]json.RawMessage
+
+// TODO(lyuxuan): delete this struct after cleaning up old service config implementation.
+type jsonSC struct {
+	LoadBalancingPolicy *string
+	LoadBalancingConfig *[]loadBalancingConfig
+	MethodConfig        *[]jsonMC
+	RetryThrottling     *retryThrottlingPolicy
+	HealthCheckConfig   *healthCheckConfig
+}
+
+func init() {
+	internal.ParseServiceConfigForTesting = parseServiceConfig
+}
+func parseServiceConfig(js string) *serviceconfig.ParseResult {
+	if len(js) == 0 {
+		return &serviceconfig.ParseResult{Err: fmt.Errorf("no JSON service config provided")}
+	}
+	var rsc jsonSC
+	err := json.Unmarshal([]byte(js), &rsc)
+	if err != nil {
+		grpclog.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
+		return &serviceconfig.ParseResult{Err: err}
+	}
+	sc := ServiceConfig{
+		LB:                rsc.LoadBalancingPolicy,
+		Methods:           make(map[string]MethodConfig),
+		retryThrottling:   rsc.RetryThrottling,
+		healthCheckConfig: rsc.HealthCheckConfig,
+		rawJSONString:     js,
+	}
+	if rsc.LoadBalancingConfig != nil {
+		for i, lbcfg := range *rsc.LoadBalancingConfig {
+			if len(lbcfg) != 1 {
+				err := fmt.Errorf("invalid loadBalancingConfig: entry %v does not contain exactly 1 policy/config pair: %q", i, lbcfg)
+				grpclog.Warningf(err.Error())
+				return &serviceconfig.ParseResult{Err: err}
+			}
+			var name string
+			var jsonCfg json.RawMessage
+			for name, jsonCfg = range lbcfg {
+			}
+			builder := balancer.Get(name)
+			if builder == nil {
+				continue
+			}
+			sc.lbConfig = &lbConfig{name: name}
+			if parser, ok := builder.(balancer.ConfigParser); ok {
+				var err error
+				sc.lbConfig.cfg, err = parser.ParseConfig(jsonCfg)
+				if err != nil {
+					return &serviceconfig.ParseResult{Err: fmt.Errorf("error parsing loadBalancingConfig for policy %q: %v", name, err)}
+				}
+			} else if string(jsonCfg) != "{}" {
+				grpclog.Warningf("non-empty balancer configuration %q, but balancer does not implement ParseConfig", string(jsonCfg))
+			}
+			break
+		}
+		if sc.lbConfig == nil {
+			// We had a loadBalancingConfig field but did not encounter a
+			// supported policy.  The config is considered invalid in this
+			// case.
+			err := fmt.Errorf("invalid loadBalancingConfig: no supported policies found")
+			grpclog.Warningf(err.Error())
+			return &serviceconfig.ParseResult{Err: err}
+		}
+	}
+
+	if rsc.MethodConfig == nil {
+		return &serviceconfig.ParseResult{Config: &sc}
+	}
+	for _, m := range *rsc.MethodConfig {
+		if m.Name == nil {
+			continue
+		}
+		d, err := parseDuration(m.Timeout)
+		if err != nil {
+			grpclog.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
+			return &serviceconfig.ParseResult{Err: err}
+		}
+
+		mc := MethodConfig{
+			WaitForReady: m.WaitForReady,
+			Timeout:      d,
+		}
+		if mc.retryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
+			grpclog.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
+			return &serviceconfig.ParseResult{Err: err}
+		}
+		if m.MaxRequestMessageBytes != nil {
+			if *m.MaxRequestMessageBytes > int64(maxInt) {
+				mc.MaxReqSize = newInt(maxInt)
+			} else {
+				mc.MaxReqSize = newInt(int(*m.MaxRequestMessageBytes))
+			}
+		}
+		if m.MaxResponseMessageBytes != nil {
+			if *m.MaxResponseMessageBytes > int64(maxInt) {
+				mc.MaxRespSize = newInt(maxInt)
+			} else {
+				mc.MaxRespSize = newInt(int(*m.MaxResponseMessageBytes))
+			}
+		}
+		for _, n := range *m.Name {
+			if path, valid := n.generatePath(); valid {
+				sc.Methods[path] = mc
+			}
+		}
+	}
+
+	if sc.retryThrottling != nil {
+		if mt := sc.retryThrottling.MaxTokens; mt <= 0 || mt > 1000 {
+			return &serviceconfig.ParseResult{Err: fmt.Errorf("invalid retry throttling config: maxTokens (%v) out of range (0, 1000]", mt)}
+		}
+		if tr := sc.retryThrottling.TokenRatio; tr <= 0 {
+			return &serviceconfig.ParseResult{Err: fmt.Errorf("invalid retry throttling config: tokenRatio (%v) may not be negative", tr)}
+		}
+	}
+	return &serviceconfig.ParseResult{Config: &sc}
+}
+
+func convertRetryPolicy(jrp *jsonRetryPolicy) (p *retryPolicy, err error) {
+	if jrp == nil {
+		return nil, nil
+	}
+	ib, err := parseDuration(&jrp.InitialBackoff)
+	if err != nil {
+		return nil, err
+	}
+	mb, err := parseDuration(&jrp.MaxBackoff)
+	if err != nil {
+		return nil, err
+	}
+
+	if jrp.MaxAttempts <= 1 ||
+		*ib <= 0 ||
+		*mb <= 0 ||
+		jrp.BackoffMultiplier <= 0 ||
+		len(jrp.RetryableStatusCodes) == 0 {
+		grpclog.Warningf("grpc: ignoring retry policy %v due to illegal configuration", jrp)
+		return nil, nil
+	}
+
+	rp := &retryPolicy{
+		maxAttempts:          jrp.MaxAttempts,
+		initialBackoff:       *ib,
+		maxBackoff:           *mb,
+		backoffMultiplier:    jrp.BackoffMultiplier,
+		retryableStatusCodes: make(map[codes.Code]bool),
+	}
+	if rp.maxAttempts > 5 {
+		// TODO(retry): Make the max maxAttempts configurable.
+		rp.maxAttempts = 5
+	}
+	for _, code := range jrp.RetryableStatusCodes {
+		rp.retryableStatusCodes[code] = true
+	}
+	return rp, nil
+}
+
+func min(a, b *int) *int {
+	if *a < *b {
+		return a
+	}
+	return b
+}
+
+func getMaxSize(mcMax, doptMax *int, defaultVal int) *int {
+	if mcMax == nil && doptMax == nil {
+		return &defaultVal
+	}
+	if mcMax != nil && doptMax != nil {
+		return min(mcMax, doptMax)
+	}
+	if mcMax != nil {
+		return mcMax
+	}
+	return doptMax
+}
+
+func newInt(b int) *int {
+	return &b
+}
diff --git a/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go b/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
new file mode 100644
index 0000000..187c304
--- /dev/null
+++ b/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
@@ -0,0 +1,41 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package serviceconfig defines types and methods for operating on gRPC
+// service configs.
+//
+// This package is EXPERIMENTAL.
+package serviceconfig
+
+// Config represents an opaque data structure holding a service config.
+type Config interface {
+	isServiceConfig()
+}
+
+// LoadBalancingConfig represents an opaque data structure holding a load
+// balancing config.
+type LoadBalancingConfig interface {
+	isLoadBalancingConfig()
+}
+
+// ParseResult contains a service config or an error.  Exactly one must be
+// non-nil.
+type ParseResult struct {
+	Config Config
+	Err    error
+}
diff --git a/vendor/google.golang.org/grpc/stats/handlers.go b/vendor/google.golang.org/grpc/stats/handlers.go
new file mode 100644
index 0000000..dc03731
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stats/handlers.go
@@ -0,0 +1,63 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package stats
+
+import (
+	"context"
+	"net"
+)
+
+// ConnTagInfo defines the relevant information needed by connection context tagger.
+type ConnTagInfo struct {
+	// RemoteAddr is the remote address of the corresponding connection.
+	RemoteAddr net.Addr
+	// LocalAddr is the local address of the corresponding connection.
+	LocalAddr net.Addr
+}
+
+// RPCTagInfo defines the relevant information needed by RPC context tagger.
+type RPCTagInfo struct {
+	// FullMethodName is the RPC method in the format of /package.service/method.
+	FullMethodName string
+	// FailFast indicates if this RPC is failfast.
+	// This field is only valid on client side, it's always false on server side.
+	FailFast bool
+}
+
+// Handler defines the interface for the related stats handling (e.g., RPCs, connections).
+type Handler interface {
+	// TagRPC can attach some information to the given context.
+	// The context used for the rest lifetime of the RPC will be derived from
+	// the returned context.
+	TagRPC(context.Context, *RPCTagInfo) context.Context
+	// HandleRPC processes the RPC stats.
+	HandleRPC(context.Context, RPCStats)
+
+	// TagConn can attach some information to the given context.
+	// The returned context will be used for stats handling.
+	// For conn stats handling, the context used in HandleConn for this
+	// connection will be derived from the context returned.
+	// For RPC stats handling,
+	//  - On server side, the context used in HandleRPC for all RPCs on this
+	// connection will be derived from the context returned.
+	//  - On client side, the context is not derived from the context returned.
+	TagConn(context.Context, *ConnTagInfo) context.Context
+	// HandleConn processes the Conn stats.
+	HandleConn(context.Context, ConnStats)
+}
diff --git a/vendor/google.golang.org/grpc/stats/stats.go b/vendor/google.golang.org/grpc/stats/stats.go
new file mode 100644
index 0000000..9e22c39
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stats/stats.go
@@ -0,0 +1,311 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+//go:generate protoc --go_out=plugins=grpc:. grpc_testing/test.proto
+
+// Package stats is for collecting and reporting various network and RPC stats.
+// This package is for monitoring purpose only. All fields are read-only.
+// All APIs are experimental.
+package stats // import "google.golang.org/grpc/stats"
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"google.golang.org/grpc/metadata"
+)
+
+// RPCStats contains stats information about RPCs.
+type RPCStats interface {
+	isRPCStats()
+	// IsClient returns true if this RPCStats is from client side.
+	IsClient() bool
+}
+
+// Begin contains stats when an RPC begins.
+// FailFast is only valid if this Begin is from client side.
+type Begin struct {
+	// Client is true if this Begin is from client side.
+	Client bool
+	// BeginTime is the time when the RPC begins.
+	BeginTime time.Time
+	// FailFast indicates if this RPC is failfast.
+	FailFast bool
+}
+
+// IsClient indicates if the stats information is from client side.
+func (s *Begin) IsClient() bool { return s.Client }
+
+func (s *Begin) isRPCStats() {}
+
+// InPayload contains the information for an incoming payload.
+type InPayload struct {
+	// Client is true if this InPayload is from client side.
+	Client bool
+	// Payload is the payload with original type.
+	Payload interface{}
+	// Data is the serialized message payload.
+	Data []byte
+	// Length is the length of uncompressed data.
+	Length int
+	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	WireLength int
+	// RecvTime is the time when the payload is received.
+	RecvTime time.Time
+}
+
+// IsClient indicates if the stats information is from client side.
+func (s *InPayload) IsClient() bool { return s.Client }
+
+func (s *InPayload) isRPCStats() {}
+
+// InHeader contains stats when a header is received.
+type InHeader struct {
+	// Client is true if this InHeader is from client side.
+	Client bool
+	// WireLength is the wire length of header.
+	WireLength int
+
+	// The following fields are valid only if Client is false.
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+	// RemoteAddr is the remote address of the corresponding connection.
+	RemoteAddr net.Addr
+	// LocalAddr is the local address of the corresponding connection.
+	LocalAddr net.Addr
+	// Compression is the compression algorithm used for the RPC.
+	Compression string
+	// Header contains the header metadata received.
+	Header metadata.MD
+}
+
+// IsClient indicates if the stats information is from client side.
+func (s *InHeader) IsClient() bool { return s.Client }
+
+func (s *InHeader) isRPCStats() {}
+
+// InTrailer contains stats when a trailer is received.
+type InTrailer struct {
+	// Client is true if this InTrailer is from client side.
+	Client bool
+	// WireLength is the wire length of trailer.
+	WireLength int
+	// Trailer contains the trailer metadata received from the server. This
+	// field is only valid if this InTrailer is from the client side.
+	Trailer metadata.MD
+}
+
+// IsClient indicates if the stats information is from client side.
+func (s *InTrailer) IsClient() bool { return s.Client }
+
+func (s *InTrailer) isRPCStats() {}
+
+// OutPayload contains the information for an outgoing payload.
+type OutPayload struct {
+	// Client is true if this OutPayload is from client side.
+	Client bool
+	// Payload is the payload with original type.
+	Payload interface{}
+	// Data is the serialized message payload.
+	Data []byte
+	// Length is the length of uncompressed data.
+	Length int
+	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	WireLength int
+	// SentTime is the time when the payload is sent.
+	SentTime time.Time
+}
+
+// IsClient indicates if this stats information is from client side.
+func (s *OutPayload) IsClient() bool { return s.Client }
+
+func (s *OutPayload) isRPCStats() {}
+
+// OutHeader contains stats when a header is sent.
+type OutHeader struct {
+	// Client is true if this OutHeader is from client side.
+	Client bool
+
+	// The following fields are valid only if Client is true.
+	// FullMethod is the full RPC method string, i.e., /package.service/method.
+	FullMethod string
+	// RemoteAddr is the remote address of the corresponding connection.
+	RemoteAddr net.Addr
+	// LocalAddr is the local address of the corresponding connection.
+	LocalAddr net.Addr
+	// Compression is the compression algorithm used for the RPC.
+	Compression string
+	// Header contains the header metadata sent.
+	Header metadata.MD
+}
+
+// IsClient indicates if this stats information is from client side.
+func (s *OutHeader) IsClient() bool { return s.Client }
+
+func (s *OutHeader) isRPCStats() {}
+
+// OutTrailer contains stats when a trailer is sent.
+type OutTrailer struct {
+	// Client is true if this OutTrailer is from client side.
+	Client bool
+	// WireLength is the wire length of trailer.
+	WireLength int
+	// Trailer contains the trailer metadata sent to the client. This
+	// field is only valid if this OutTrailer is from the server side.
+	Trailer metadata.MD
+}
+
+// IsClient indicates if this stats information is from client side.
+func (s *OutTrailer) IsClient() bool { return s.Client }
+
+func (s *OutTrailer) isRPCStats() {}
+
+// End contains stats when an RPC ends.
+type End struct {
+	// Client is true if this End is from client side.
+	Client bool
+	// BeginTime is the time when the RPC began.
+	BeginTime time.Time
+	// EndTime is the time when the RPC ends.
+	EndTime time.Time
+	// Trailer contains the trailer metadata received from the server. This
+	// field is only valid if this End is from the client side.
+	// Deprecated: use Trailer in InTrailer instead.
+	Trailer metadata.MD
+	// Error is the error the RPC ended with. It is an error generated from
+	// status.Status and can be converted back to status.Status using
+	// status.FromError if non-nil.
+	Error error
+}
+
+// IsClient indicates if this is from client side.
+func (s *End) IsClient() bool { return s.Client }
+
+func (s *End) isRPCStats() {}
+
+// ConnStats contains stats information about connections.
+type ConnStats interface {
+	isConnStats()
+	// IsClient returns true if this ConnStats is from client side.
+	IsClient() bool
+}
+
+// ConnBegin contains the stats of a connection when it is established.
+type ConnBegin struct {
+	// Client is true if this ConnBegin is from client side.
+	Client bool
+}
+
+// IsClient indicates if this is from client side.
+func (s *ConnBegin) IsClient() bool { return s.Client }
+
+func (s *ConnBegin) isConnStats() {}
+
+// ConnEnd contains the stats of a connection when it ends.
+type ConnEnd struct {
+	// Client is true if this ConnEnd is from client side.
+	Client bool
+}
+
+// IsClient indicates if this is from client side.
+func (s *ConnEnd) IsClient() bool { return s.Client }
+
+func (s *ConnEnd) isConnStats() {}
+
+type incomingTagsKey struct{}
+type outgoingTagsKey struct{}
+
+// SetTags attaches stats tagging data to the context, which will be sent in
+// the outgoing RPC with the header grpc-tags-bin.  Subsequent calls to
+// SetTags will overwrite the values from earlier calls.
+//
+// NOTE: this is provided only for backward compatibility with existing clients
+// and will likely be removed in an upcoming release.  New uses should transmit
+// this type of data using metadata with a different, non-reserved (i.e. does
+// not begin with "grpc-") header name.
+func SetTags(ctx context.Context, b []byte) context.Context {
+	return context.WithValue(ctx, outgoingTagsKey{}, b)
+}
+
+// Tags returns the tags from the context for the inbound RPC.
+//
+// NOTE: this is provided only for backward compatibility with existing clients
+// and will likely be removed in an upcoming release.  New uses should transmit
+// this type of data using metadata with a different, non-reserved (i.e. does
+// not begin with "grpc-") header name.
+func Tags(ctx context.Context) []byte {
+	b, _ := ctx.Value(incomingTagsKey{}).([]byte)
+	return b
+}
+
+// SetIncomingTags attaches stats tagging data to the context, to be read by
+// the application (not sent in outgoing RPCs).
+//
+// This is intended for gRPC-internal use ONLY.
+func SetIncomingTags(ctx context.Context, b []byte) context.Context {
+	return context.WithValue(ctx, incomingTagsKey{}, b)
+}
+
+// OutgoingTags returns the tags from the context for the outbound RPC.
+//
+// This is intended for gRPC-internal use ONLY.
+func OutgoingTags(ctx context.Context) []byte {
+	b, _ := ctx.Value(outgoingTagsKey{}).([]byte)
+	return b
+}
+
+type incomingTraceKey struct{}
+type outgoingTraceKey struct{}
+
+// SetTrace attaches stats tagging data to the context, which will be sent in
+// the outgoing RPC with the header grpc-trace-bin.  Subsequent calls to
+// SetTrace will overwrite the values from earlier calls.
+//
+// NOTE: this is provided only for backward compatibility with existing clients
+// and will likely be removed in an upcoming release.  New uses should transmit
+// this type of data using metadata with a different, non-reserved (i.e. does
+// not begin with "grpc-") header name.
+func SetTrace(ctx context.Context, b []byte) context.Context {
+	return context.WithValue(ctx, outgoingTraceKey{}, b)
+}
+
+// Trace returns the trace from the context for the inbound RPC.
+//
+// NOTE: this is provided only for backward compatibility with existing clients
+// and will likely be removed in an upcoming release.  New uses should transmit
+// this type of data using metadata with a different, non-reserved (i.e. does
+// not begin with "grpc-") header name.
+func Trace(ctx context.Context) []byte {
+	b, _ := ctx.Value(incomingTraceKey{}).([]byte)
+	return b
+}
+
+// SetIncomingTrace attaches stats tagging data to the context, to be read by
+// the application (not sent in outgoing RPCs).  It is intended for
+// gRPC-internal use.
+func SetIncomingTrace(ctx context.Context, b []byte) context.Context {
+	return context.WithValue(ctx, incomingTraceKey{}, b)
+}
+
+// OutgoingTrace returns the trace from the context for the outbound RPC.  It is
+// intended for gRPC-internal use.
+func OutgoingTrace(ctx context.Context) []byte {
+	b, _ := ctx.Value(outgoingTraceKey{}).([]byte)
+	return b
+}
diff --git a/vendor/google.golang.org/grpc/status/status.go b/vendor/google.golang.org/grpc/status/status.go
new file mode 100644
index 0000000..a1348e9
--- /dev/null
+++ b/vendor/google.golang.org/grpc/status/status.go
@@ -0,0 +1,228 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package status implements errors returned by gRPC.  These errors are
+// serialized and transmitted on the wire between server and client, and allow
+// for additional data to be transmitted via the Details field in the status
+// proto.  gRPC service handlers should return an error created by this
+// package, and gRPC clients should expect a corresponding error to be
+// returned from the RPC call.
+//
+// This package upholds the invariants that a non-nil error may not
+// contain an OK code, and an OK code must result in a nil error.
+package status
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes"
+	spb "google.golang.org/genproto/googleapis/rpc/status"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/internal"
+)
+
+func init() {
+	internal.StatusRawProto = statusRawProto
+}
+
+func statusRawProto(s *Status) *spb.Status { return s.s }
+
+// statusError is an alias of a status proto.  It implements error and Status,
+// and a nil statusError should never be returned by this package.
+type statusError spb.Status
+
+func (se *statusError) Error() string {
+	p := (*spb.Status)(se)
+	return fmt.Sprintf("rpc error: code = %s desc = %s", codes.Code(p.GetCode()), p.GetMessage())
+}
+
+func (se *statusError) GRPCStatus() *Status {
+	return &Status{s: (*spb.Status)(se)}
+}
+
+// Is implements future error.Is functionality.
+// A statusError is equivalent if the code and message are identical.
+func (se *statusError) Is(target error) bool {
+	tse, ok := target.(*statusError)
+	if !ok {
+		return false
+	}
+
+	return proto.Equal((*spb.Status)(se), (*spb.Status)(tse))
+}
+
+// Status represents an RPC status code, message, and details.  It is immutable
+// and should be created with New, Newf, or FromProto.
+type Status struct {
+	s *spb.Status
+}
+
+// Code returns the status code contained in s.
+func (s *Status) Code() codes.Code {
+	if s == nil || s.s == nil {
+		return codes.OK
+	}
+	return codes.Code(s.s.Code)
+}
+
+// Message returns the message contained in s.
+func (s *Status) Message() string {
+	if s == nil || s.s == nil {
+		return ""
+	}
+	return s.s.Message
+}
+
+// Proto returns s's status as an spb.Status proto message.
+func (s *Status) Proto() *spb.Status {
+	if s == nil {
+		return nil
+	}
+	return proto.Clone(s.s).(*spb.Status)
+}
+
+// Err returns an immutable error representing s; returns nil if s.Code() is
+// OK.
+func (s *Status) Err() error {
+	if s.Code() == codes.OK {
+		return nil
+	}
+	return (*statusError)(s.s)
+}
+
+// New returns a Status representing c and msg.
+func New(c codes.Code, msg string) *Status {
+	return &Status{s: &spb.Status{Code: int32(c), Message: msg}}
+}
+
+// Newf returns New(c, fmt.Sprintf(format, a...)).
+func Newf(c codes.Code, format string, a ...interface{}) *Status {
+	return New(c, fmt.Sprintf(format, a...))
+}
+
+// Error returns an error representing c and msg.  If c is OK, returns nil.
+func Error(c codes.Code, msg string) error {
+	return New(c, msg).Err()
+}
+
+// Errorf returns Error(c, fmt.Sprintf(format, a...)).
+func Errorf(c codes.Code, format string, a ...interface{}) error {
+	return Error(c, fmt.Sprintf(format, a...))
+}
+
+// ErrorProto returns an error representing s.  If s.Code is OK, returns nil.
+func ErrorProto(s *spb.Status) error {
+	return FromProto(s).Err()
+}
+
+// FromProto returns a Status representing s.
+func FromProto(s *spb.Status) *Status {
+	return &Status{s: proto.Clone(s).(*spb.Status)}
+}
+
+// FromError returns a Status representing err if it was produced from this
+// package or has a method `GRPCStatus() *Status`. Otherwise, ok is false and a
+// Status is returned with codes.Unknown and the original error message.
+func FromError(err error) (s *Status, ok bool) {
+	if err == nil {
+		return nil, true
+	}
+	if se, ok := err.(interface {
+		GRPCStatus() *Status
+	}); ok {
+		return se.GRPCStatus(), true
+	}
+	return New(codes.Unknown, err.Error()), false
+}
+
+// Convert is a convenience function which removes the need to handle the
+// boolean return value from FromError.
+func Convert(err error) *Status {
+	s, _ := FromError(err)
+	return s
+}
+
+// WithDetails returns a new status with the provided details messages appended to the status.
+// If any errors are encountered, it returns nil and the first error encountered.
+func (s *Status) WithDetails(details ...proto.Message) (*Status, error) {
+	if s.Code() == codes.OK {
+		return nil, errors.New("no error details for status with code OK")
+	}
+	// s.Code() != OK implies that s.Proto() != nil.
+	p := s.Proto()
+	for _, detail := range details {
+		any, err := ptypes.MarshalAny(detail)
+		if err != nil {
+			return nil, err
+		}
+		p.Details = append(p.Details, any)
+	}
+	return &Status{s: p}, nil
+}
+
+// Details returns a slice of details messages attached to the status.
+// If a detail cannot be decoded, the error is returned in place of the detail.
+func (s *Status) Details() []interface{} {
+	if s == nil || s.s == nil {
+		return nil
+	}
+	details := make([]interface{}, 0, len(s.s.Details))
+	for _, any := range s.s.Details {
+		detail := &ptypes.DynamicAny{}
+		if err := ptypes.UnmarshalAny(any, detail); err != nil {
+			details = append(details, err)
+			continue
+		}
+		details = append(details, detail.Message)
+	}
+	return details
+}
+
+// Code returns the Code of the error if it is a Status error, codes.OK if err
+// is nil, or codes.Unknown otherwise.
+func Code(err error) codes.Code {
+	// Don't use FromError to avoid allocation of OK status.
+	if err == nil {
+		return codes.OK
+	}
+	if se, ok := err.(interface {
+		GRPCStatus() *Status
+	}); ok {
+		return se.GRPCStatus().Code()
+	}
+	return codes.Unknown
+}
+
+// FromContextError converts a context error into a Status.  It returns a
+// Status with codes.OK if err is nil, or a Status with codes.Unknown if err is
+// non-nil and not a context error.
+func FromContextError(err error) *Status {
+	switch err {
+	case nil:
+		return nil
+	case context.DeadlineExceeded:
+		return New(codes.DeadlineExceeded, err.Error())
+	case context.Canceled:
+		return New(codes.Canceled, err.Error())
+	default:
+		return New(codes.Unknown, err.Error())
+	}
+}
diff --git a/vendor/google.golang.org/grpc/stream.go b/vendor/google.golang.org/grpc/stream.go
new file mode 100644
index 0000000..bb99940
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stream.go
@@ -0,0 +1,1529 @@
+/*
+ *
+ * Copyright 2014 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"context"
+	"errors"
+	"io"
+	"math"
+	"strconv"
+	"sync"
+	"time"
+
+	"golang.org/x/net/trace"
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal/balancerload"
+	"google.golang.org/grpc/internal/binarylog"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+	"google.golang.org/grpc/stats"
+	"google.golang.org/grpc/status"
+)
+
+// StreamHandler defines the handler called by gRPC server to complete the
+// execution of a streaming RPC. If a StreamHandler returns an error, it
+// should be produced by the status package, or else gRPC will use
+// codes.Unknown as the status code and err.Error() as the status message
+// of the RPC.
+type StreamHandler func(srv interface{}, stream ServerStream) error
+
+// StreamDesc represents a streaming RPC service's method specification.
+type StreamDesc struct {
+	StreamName string
+	Handler    StreamHandler
+
+	// At least one of these is true.
+	ServerStreams bool
+	ClientStreams bool
+}
+
+// Stream defines the common interface a client or server stream has to satisfy.
+//
+// Deprecated: See ClientStream and ServerStream documentation instead.
+type Stream interface {
+	// Deprecated: See ClientStream and ServerStream documentation instead.
+	Context() context.Context
+	// Deprecated: See ClientStream and ServerStream documentation instead.
+	SendMsg(m interface{}) error
+	// Deprecated: See ClientStream and ServerStream documentation instead.
+	RecvMsg(m interface{}) error
+}
+
+// ClientStream defines the client-side behavior of a streaming RPC.
+//
+// All errors returned from ClientStream methods are compatible with the
+// status package.
+type ClientStream interface {
+	// Header returns the header metadata received from the server if there
+	// is any. It blocks if the metadata is not ready to read.
+	Header() (metadata.MD, error)
+	// Trailer returns the trailer metadata from the server, if there is any.
+	// It must only be called after stream.CloseAndRecv has returned, or
+	// stream.Recv has returned a non-nil error (including io.EOF).
+	Trailer() metadata.MD
+	// CloseSend closes the send direction of the stream. It closes the stream
+	// when non-nil error is met. It is also not safe to call CloseSend
+	// concurrently with SendMsg.
+	CloseSend() error
+	// Context returns the context for this stream.
+	//
+	// It should not be called until after Header or RecvMsg has returned. Once
+	// called, subsequent client-side retries are disabled.
+	Context() context.Context
+	// SendMsg is generally called by generated code. On error, SendMsg aborts
+	// the stream. If the error was generated by the client, the status is
+	// returned directly; otherwise, io.EOF is returned and the status of
+	// the stream may be discovered using RecvMsg.
+	//
+	// SendMsg blocks until:
+	//   - There is sufficient flow control to schedule m with the transport, or
+	//   - The stream is done, or
+	//   - The stream breaks.
+	//
+	// SendMsg does not wait until the message is received by the server. An
+	// untimely stream closure may result in lost messages. To ensure delivery,
+	// users should ensure the RPC completed successfully using RecvMsg.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not safe
+	// to call SendMsg on the same stream in different goroutines. It is also
+	// not safe to call CloseSend concurrently with SendMsg.
+	SendMsg(m interface{}) error
+	// RecvMsg blocks until it receives a message into m or the stream is
+	// done. It returns io.EOF when the stream completes successfully. On
+	// any other error, the stream is aborted and the error contains the RPC
+	// status.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not
+	// safe to call RecvMsg on the same stream in different goroutines.
+	RecvMsg(m interface{}) error
+}
+
+// NewStream creates a new Stream for the client side. This is typically
+// called by generated code. ctx is used for the lifetime of the stream.
+//
+// To ensure resources are not leaked due to the stream returned, one of the following
+// actions must be performed:
+//
+//      1. Call Close on the ClientConn.
+//      2. Cancel the context provided.
+//      3. Call RecvMsg until a non-nil error is returned. A protobuf-generated
+//         client-streaming RPC, for instance, might use the helper function
+//         CloseAndRecv (note that CloseSend does not Recv, therefore is not
+//         guaranteed to release all resources).
+//      4. Receive a non-nil, non-io.EOF error from Header or SendMsg.
+//
+// If none of the above happen, a goroutine and a context will be leaked, and grpc
+// will not call the optionally-configured stats handler with a stats.End message.
+func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
+	// allow interceptor to see all applicable call options, which means those
+	// configured as defaults from dial option as well as per-call options
+	opts = combine(cc.dopts.callOptions, opts)
+
+	if cc.dopts.streamInt != nil {
+		return cc.dopts.streamInt(ctx, desc, cc, method, newClientStream, opts...)
+	}
+	return newClientStream(ctx, desc, cc, method, opts...)
+}
+
+// NewClientStream is a wrapper for ClientConn.NewStream.
+func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error) {
+	return cc.NewStream(ctx, desc, method, opts...)
+}
+
+func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
+	if channelz.IsOn() {
+		cc.incrCallsStarted()
+		defer func() {
+			if err != nil {
+				cc.incrCallsFailed()
+			}
+		}()
+	}
+	c := defaultCallInfo()
+	// Provide an opportunity for the first RPC to see the first service config
+	// provided by the resolver.
+	if err := cc.waitForResolvedAddrs(ctx); err != nil {
+		return nil, err
+	}
+	mc := cc.GetMethodConfig(method)
+	if mc.WaitForReady != nil {
+		c.failFast = !*mc.WaitForReady
+	}
+
+	// Possible context leak:
+	// The cancel function for the child context we create will only be called
+	// when RecvMsg returns a non-nil error, if the ClientConn is closed, or if
+	// an error is generated by SendMsg.
+	// https://github.com/grpc/grpc-go/issues/1818.
+	var cancel context.CancelFunc
+	if mc.Timeout != nil && *mc.Timeout >= 0 {
+		ctx, cancel = context.WithTimeout(ctx, *mc.Timeout)
+	} else {
+		ctx, cancel = context.WithCancel(ctx)
+	}
+	defer func() {
+		if err != nil {
+			cancel()
+		}
+	}()
+
+	for _, o := range opts {
+		if err := o.before(c); err != nil {
+			return nil, toRPCErr(err)
+		}
+	}
+	c.maxSendMessageSize = getMaxSize(mc.MaxReqSize, c.maxSendMessageSize, defaultClientMaxSendMessageSize)
+	c.maxReceiveMessageSize = getMaxSize(mc.MaxRespSize, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)
+	if err := setCallInfoCodec(c); err != nil {
+		return nil, err
+	}
+
+	callHdr := &transport.CallHdr{
+		Host:           cc.authority,
+		Method:         method,
+		ContentSubtype: c.contentSubtype,
+	}
+
+	// Set our outgoing compression according to the UseCompressor CallOption, if
+	// set.  In that case, also find the compressor from the encoding package.
+	// Otherwise, use the compressor configured by the WithCompressor DialOption,
+	// if set.
+	var cp Compressor
+	var comp encoding.Compressor
+	if ct := c.compressorType; ct != "" {
+		callHdr.SendCompress = ct
+		if ct != encoding.Identity {
+			comp = encoding.GetCompressor(ct)
+			if comp == nil {
+				return nil, status.Errorf(codes.Internal, "grpc: Compressor is not installed for requested grpc-encoding %q", ct)
+			}
+		}
+	} else if cc.dopts.cp != nil {
+		callHdr.SendCompress = cc.dopts.cp.Type()
+		cp = cc.dopts.cp
+	}
+	if c.creds != nil {
+		callHdr.Creds = c.creds
+	}
+	var trInfo *traceInfo
+	if EnableTracing {
+		trInfo = &traceInfo{
+			tr: trace.New("grpc.Sent."+methodFamily(method), method),
+			firstLine: firstLine{
+				client: true,
+			},
+		}
+		if deadline, ok := ctx.Deadline(); ok {
+			trInfo.firstLine.deadline = time.Until(deadline)
+		}
+		trInfo.tr.LazyLog(&trInfo.firstLine, false)
+		ctx = trace.NewContext(ctx, trInfo.tr)
+	}
+	ctx = newContextWithRPCInfo(ctx, c.failFast, c.codec, cp, comp)
+	sh := cc.dopts.copts.StatsHandler
+	var beginTime time.Time
+	if sh != nil {
+		ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method, FailFast: c.failFast})
+		beginTime = time.Now()
+		begin := &stats.Begin{
+			Client:    true,
+			BeginTime: beginTime,
+			FailFast:  c.failFast,
+		}
+		sh.HandleRPC(ctx, begin)
+	}
+
+	cs := &clientStream{
+		callHdr:      callHdr,
+		ctx:          ctx,
+		methodConfig: &mc,
+		opts:         opts,
+		callInfo:     c,
+		cc:           cc,
+		desc:         desc,
+		codec:        c.codec,
+		cp:           cp,
+		comp:         comp,
+		cancel:       cancel,
+		beginTime:    beginTime,
+		firstAttempt: true,
+	}
+	if !cc.dopts.disableRetry {
+		cs.retryThrottler = cc.retryThrottler.Load().(*retryThrottler)
+	}
+	cs.binlog = binarylog.GetMethodLogger(method)
+
+	cs.callInfo.stream = cs
+	// Only this initial attempt has stats/tracing.
+	// TODO(dfawley): move to newAttempt when per-attempt stats are implemented.
+	if err := cs.newAttemptLocked(sh, trInfo); err != nil {
+		cs.finish(err)
+		return nil, err
+	}
+
+	op := func(a *csAttempt) error { return a.newStream() }
+	if err := cs.withRetry(op, func() { cs.bufferForRetryLocked(0, op) }); err != nil {
+		cs.finish(err)
+		return nil, err
+	}
+
+	if cs.binlog != nil {
+		md, _ := metadata.FromOutgoingContext(ctx)
+		logEntry := &binarylog.ClientHeader{
+			OnClientSide: true,
+			Header:       md,
+			MethodName:   method,
+			Authority:    cs.cc.authority,
+		}
+		if deadline, ok := ctx.Deadline(); ok {
+			logEntry.Timeout = time.Until(deadline)
+			if logEntry.Timeout < 0 {
+				logEntry.Timeout = 0
+			}
+		}
+		cs.binlog.Log(logEntry)
+	}
+
+	if desc != unaryStreamDesc {
+		// Listen on cc and stream contexts to cleanup when the user closes the
+		// ClientConn or cancels the stream context.  In all other cases, an error
+		// should already be injected into the recv buffer by the transport, which
+		// the client will eventually receive, and then we will cancel the stream's
+		// context in clientStream.finish.
+		go func() {
+			select {
+			case <-cc.ctx.Done():
+				cs.finish(ErrClientConnClosing)
+			case <-ctx.Done():
+				cs.finish(toRPCErr(ctx.Err()))
+			}
+		}()
+	}
+	return cs, nil
+}
+
+// newAttemptLocked creates a new attempt with a transport.
+// If it succeeds, then it replaces clientStream's attempt with this new attempt.
+func (cs *clientStream) newAttemptLocked(sh stats.Handler, trInfo *traceInfo) (retErr error) {
+	newAttempt := &csAttempt{
+		cs:           cs,
+		dc:           cs.cc.dopts.dc,
+		statsHandler: sh,
+		trInfo:       trInfo,
+	}
+	defer func() {
+		if retErr != nil {
+			// This attempt is not set in the clientStream, so it's finish won't
+			// be called. Call it here for stats and trace in case they are not
+			// nil.
+			newAttempt.finish(retErr)
+		}
+	}()
+
+	if err := cs.ctx.Err(); err != nil {
+		return toRPCErr(err)
+	}
+	t, done, err := cs.cc.getTransport(cs.ctx, cs.callInfo.failFast, cs.callHdr.Method)
+	if err != nil {
+		return err
+	}
+	if trInfo != nil {
+		trInfo.firstLine.SetRemoteAddr(t.RemoteAddr())
+	}
+	newAttempt.t = t
+	newAttempt.done = done
+	cs.attempt = newAttempt
+	return nil
+}
+
+func (a *csAttempt) newStream() error {
+	cs := a.cs
+	cs.callHdr.PreviousAttempts = cs.numRetries
+	s, err := a.t.NewStream(cs.ctx, cs.callHdr)
+	if err != nil {
+		return toRPCErr(err)
+	}
+	cs.attempt.s = s
+	cs.attempt.p = &parser{r: s}
+	return nil
+}
+
+// clientStream implements a client side Stream.
+type clientStream struct {
+	callHdr  *transport.CallHdr
+	opts     []CallOption
+	callInfo *callInfo
+	cc       *ClientConn
+	desc     *StreamDesc
+
+	codec baseCodec
+	cp    Compressor
+	comp  encoding.Compressor
+
+	cancel context.CancelFunc // cancels all attempts
+
+	sentLast  bool // sent an end stream
+	beginTime time.Time
+
+	methodConfig *MethodConfig
+
+	ctx context.Context // the application's context, wrapped by stats/tracing
+
+	retryThrottler *retryThrottler // The throttler active when the RPC began.
+
+	binlog *binarylog.MethodLogger // Binary logger, can be nil.
+	// serverHeaderBinlogged is a boolean for whether server header has been
+	// logged. Server header will be logged when the first time one of those
+	// happens: stream.Header(), stream.Recv().
+	//
+	// It's only read and used by Recv() and Header(), so it doesn't need to be
+	// synchronized.
+	serverHeaderBinlogged bool
+
+	mu                      sync.Mutex
+	firstAttempt            bool // if true, transparent retry is valid
+	numRetries              int  // exclusive of transparent retry attempt(s)
+	numRetriesSincePushback int  // retries since pushback; to reset backoff
+	finished                bool // TODO: replace with atomic cmpxchg or sync.Once?
+	// attempt is the active client stream attempt.
+	// The only place where it is written is the newAttemptLocked method and this method never writes nil.
+	// So, attempt can be nil only inside newClientStream function when clientStream is first created.
+	// One of the first things done after clientStream's creation, is to call newAttemptLocked which either
+	// assigns a non nil value to the attempt or returns an error. If an error is returned from newAttemptLocked,
+	// then newClientStream calls finish on the clientStream and returns. So, finish method is the only
+	// place where we need to check if the attempt is nil.
+	attempt *csAttempt
+	// TODO(hedging): hedging will have multiple attempts simultaneously.
+	committed  bool                       // active attempt committed for retry?
+	buffer     []func(a *csAttempt) error // operations to replay on retry
+	bufferSize int                        // current size of buffer
+}
+
+// csAttempt implements a single transport stream attempt within a
+// clientStream.
+type csAttempt struct {
+	cs   *clientStream
+	t    transport.ClientTransport
+	s    *transport.Stream
+	p    *parser
+	done func(balancer.DoneInfo)
+
+	finished  bool
+	dc        Decompressor
+	decomp    encoding.Compressor
+	decompSet bool
+
+	mu sync.Mutex // guards trInfo.tr
+	// trInfo may be nil (if EnableTracing is false).
+	// trInfo.tr is set when created (if EnableTracing is true),
+	// and cleared when the finish method is called.
+	trInfo *traceInfo
+
+	statsHandler stats.Handler
+}
+
+func (cs *clientStream) commitAttemptLocked() {
+	cs.committed = true
+	cs.buffer = nil
+}
+
+func (cs *clientStream) commitAttempt() {
+	cs.mu.Lock()
+	cs.commitAttemptLocked()
+	cs.mu.Unlock()
+}
+
+// shouldRetry returns nil if the RPC should be retried; otherwise it returns
+// the error that should be returned by the operation.
+func (cs *clientStream) shouldRetry(err error) error {
+	if cs.attempt.s == nil && !cs.callInfo.failFast {
+		// In the event of any error from NewStream (attempt.s == nil), we
+		// never attempted to write anything to the wire, so we can retry
+		// indefinitely for non-fail-fast RPCs.
+		return nil
+	}
+	if cs.finished || cs.committed {
+		// RPC is finished or committed; cannot retry.
+		return err
+	}
+	// Wait for the trailers.
+	if cs.attempt.s != nil {
+		<-cs.attempt.s.Done()
+	}
+	if cs.firstAttempt && (cs.attempt.s == nil || cs.attempt.s.Unprocessed()) {
+		// First attempt, stream unprocessed: transparently retry.
+		cs.firstAttempt = false
+		return nil
+	}
+	cs.firstAttempt = false
+	if cs.cc.dopts.disableRetry {
+		return err
+	}
+
+	pushback := 0
+	hasPushback := false
+	if cs.attempt.s != nil {
+		if !cs.attempt.s.TrailersOnly() {
+			return err
+		}
+
+		// TODO(retry): Move down if the spec changes to not check server pushback
+		// before considering this a failure for throttling.
+		sps := cs.attempt.s.Trailer()["grpc-retry-pushback-ms"]
+		if len(sps) == 1 {
+			var e error
+			if pushback, e = strconv.Atoi(sps[0]); e != nil || pushback < 0 {
+				grpclog.Infof("Server retry pushback specified to abort (%q).", sps[0])
+				cs.retryThrottler.throttle() // This counts as a failure for throttling.
+				return err
+			}
+			hasPushback = true
+		} else if len(sps) > 1 {
+			grpclog.Warningf("Server retry pushback specified multiple values (%q); not retrying.", sps)
+			cs.retryThrottler.throttle() // This counts as a failure for throttling.
+			return err
+		}
+	}
+
+	var code codes.Code
+	if cs.attempt.s != nil {
+		code = cs.attempt.s.Status().Code()
+	} else {
+		code = status.Convert(err).Code()
+	}
+
+	rp := cs.methodConfig.retryPolicy
+	if rp == nil || !rp.retryableStatusCodes[code] {
+		return err
+	}
+
+	// Note: the ordering here is important; we count this as a failure
+	// only if the code matched a retryable code.
+	if cs.retryThrottler.throttle() {
+		return err
+	}
+	if cs.numRetries+1 >= rp.maxAttempts {
+		return err
+	}
+
+	var dur time.Duration
+	if hasPushback {
+		dur = time.Millisecond * time.Duration(pushback)
+		cs.numRetriesSincePushback = 0
+	} else {
+		fact := math.Pow(rp.backoffMultiplier, float64(cs.numRetriesSincePushback))
+		cur := float64(rp.initialBackoff) * fact
+		if max := float64(rp.maxBackoff); cur > max {
+			cur = max
+		}
+		dur = time.Duration(grpcrand.Int63n(int64(cur)))
+		cs.numRetriesSincePushback++
+	}
+
+	// TODO(dfawley): we could eagerly fail here if dur puts us past the
+	// deadline, but unsure if it is worth doing.
+	t := time.NewTimer(dur)
+	select {
+	case <-t.C:
+		cs.numRetries++
+		return nil
+	case <-cs.ctx.Done():
+		t.Stop()
+		return status.FromContextError(cs.ctx.Err()).Err()
+	}
+}
+
+// Returns nil if a retry was performed and succeeded; error otherwise.
+func (cs *clientStream) retryLocked(lastErr error) error {
+	for {
+		cs.attempt.finish(lastErr)
+		if err := cs.shouldRetry(lastErr); err != nil {
+			cs.commitAttemptLocked()
+			return err
+		}
+		if err := cs.newAttemptLocked(nil, nil); err != nil {
+			return err
+		}
+		if lastErr = cs.replayBufferLocked(); lastErr == nil {
+			return nil
+		}
+	}
+}
+
+func (cs *clientStream) Context() context.Context {
+	cs.commitAttempt()
+	// No need to lock before using attempt, since we know it is committed and
+	// cannot change.
+	return cs.attempt.s.Context()
+}
+
+func (cs *clientStream) withRetry(op func(a *csAttempt) error, onSuccess func()) error {
+	cs.mu.Lock()
+	for {
+		if cs.committed {
+			cs.mu.Unlock()
+			return op(cs.attempt)
+		}
+		a := cs.attempt
+		cs.mu.Unlock()
+		err := op(a)
+		cs.mu.Lock()
+		if a != cs.attempt {
+			// We started another attempt already.
+			continue
+		}
+		if err == io.EOF {
+			<-a.s.Done()
+		}
+		if err == nil || (err == io.EOF && a.s.Status().Code() == codes.OK) {
+			onSuccess()
+			cs.mu.Unlock()
+			return err
+		}
+		if err := cs.retryLocked(err); err != nil {
+			cs.mu.Unlock()
+			return err
+		}
+	}
+}
+
+func (cs *clientStream) Header() (metadata.MD, error) {
+	var m metadata.MD
+	err := cs.withRetry(func(a *csAttempt) error {
+		var err error
+		m, err = a.s.Header()
+		return toRPCErr(err)
+	}, cs.commitAttemptLocked)
+	if err != nil {
+		cs.finish(err)
+		return nil, err
+	}
+	if cs.binlog != nil && !cs.serverHeaderBinlogged {
+		// Only log if binary log is on and header has not been logged.
+		logEntry := &binarylog.ServerHeader{
+			OnClientSide: true,
+			Header:       m,
+			PeerAddr:     nil,
+		}
+		if peer, ok := peer.FromContext(cs.Context()); ok {
+			logEntry.PeerAddr = peer.Addr
+		}
+		cs.binlog.Log(logEntry)
+		cs.serverHeaderBinlogged = true
+	}
+	return m, err
+}
+
+func (cs *clientStream) Trailer() metadata.MD {
+	// On RPC failure, we never need to retry, because usage requires that
+	// RecvMsg() returned a non-nil error before calling this function is valid.
+	// We would have retried earlier if necessary.
+	//
+	// Commit the attempt anyway, just in case users are not following those
+	// directions -- it will prevent races and should not meaningfully impact
+	// performance.
+	cs.commitAttempt()
+	if cs.attempt.s == nil {
+		return nil
+	}
+	return cs.attempt.s.Trailer()
+}
+
+func (cs *clientStream) replayBufferLocked() error {
+	a := cs.attempt
+	for _, f := range cs.buffer {
+		if err := f(a); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (cs *clientStream) bufferForRetryLocked(sz int, op func(a *csAttempt) error) {
+	// Note: we still will buffer if retry is disabled (for transparent retries).
+	if cs.committed {
+		return
+	}
+	cs.bufferSize += sz
+	if cs.bufferSize > cs.callInfo.maxRetryRPCBufferSize {
+		cs.commitAttemptLocked()
+		return
+	}
+	cs.buffer = append(cs.buffer, op)
+}
+
+func (cs *clientStream) SendMsg(m interface{}) (err error) {
+	defer func() {
+		if err != nil && err != io.EOF {
+			// Call finish on the client stream for errors generated by this SendMsg
+			// call, as these indicate problems created by this client.  (Transport
+			// errors are converted to an io.EOF error in csAttempt.sendMsg; the real
+			// error will be returned from RecvMsg eventually in that case, or be
+			// retried.)
+			cs.finish(err)
+		}
+	}()
+	if cs.sentLast {
+		return status.Errorf(codes.Internal, "SendMsg called after CloseSend")
+	}
+	if !cs.desc.ClientStreams {
+		cs.sentLast = true
+	}
+
+	// load hdr, payload, data
+	hdr, payload, data, err := prepareMsg(m, cs.codec, cs.cp, cs.comp)
+	if err != nil {
+		return err
+	}
+
+	// TODO(dfawley): should we be checking len(data) instead?
+	if len(payload) > *cs.callInfo.maxSendMessageSize {
+		return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payload), *cs.callInfo.maxSendMessageSize)
+	}
+	msgBytes := data // Store the pointer before setting to nil. For binary logging.
+	op := func(a *csAttempt) error {
+		err := a.sendMsg(m, hdr, payload, data)
+		// nil out the message and uncomp when replaying; they are only needed for
+		// stats which is disabled for subsequent attempts.
+		m, data = nil, nil
+		return err
+	}
+	err = cs.withRetry(op, func() { cs.bufferForRetryLocked(len(hdr)+len(payload), op) })
+	if cs.binlog != nil && err == nil {
+		cs.binlog.Log(&binarylog.ClientMessage{
+			OnClientSide: true,
+			Message:      msgBytes,
+		})
+	}
+	return
+}
+
+func (cs *clientStream) RecvMsg(m interface{}) error {
+	if cs.binlog != nil && !cs.serverHeaderBinlogged {
+		// Call Header() to binary log header if it's not already logged.
+		cs.Header()
+	}
+	var recvInfo *payloadInfo
+	if cs.binlog != nil {
+		recvInfo = &payloadInfo{}
+	}
+	err := cs.withRetry(func(a *csAttempt) error {
+		return a.recvMsg(m, recvInfo)
+	}, cs.commitAttemptLocked)
+	if cs.binlog != nil && err == nil {
+		cs.binlog.Log(&binarylog.ServerMessage{
+			OnClientSide: true,
+			Message:      recvInfo.uncompressedBytes,
+		})
+	}
+	if err != nil || !cs.desc.ServerStreams {
+		// err != nil or non-server-streaming indicates end of stream.
+		cs.finish(err)
+
+		if cs.binlog != nil {
+			// finish will not log Trailer. Log Trailer here.
+			logEntry := &binarylog.ServerTrailer{
+				OnClientSide: true,
+				Trailer:      cs.Trailer(),
+				Err:          err,
+			}
+			if logEntry.Err == io.EOF {
+				logEntry.Err = nil
+			}
+			if peer, ok := peer.FromContext(cs.Context()); ok {
+				logEntry.PeerAddr = peer.Addr
+			}
+			cs.binlog.Log(logEntry)
+		}
+	}
+	return err
+}
+
+func (cs *clientStream) CloseSend() error {
+	if cs.sentLast {
+		// TODO: return an error and finish the stream instead, due to API misuse?
+		return nil
+	}
+	cs.sentLast = true
+	op := func(a *csAttempt) error {
+		a.t.Write(a.s, nil, nil, &transport.Options{Last: true})
+		// Always return nil; io.EOF is the only error that might make sense
+		// instead, but there is no need to signal the client to call RecvMsg
+		// as the only use left for the stream after CloseSend is to call
+		// RecvMsg.  This also matches historical behavior.
+		return nil
+	}
+	cs.withRetry(op, func() { cs.bufferForRetryLocked(0, op) })
+	if cs.binlog != nil {
+		cs.binlog.Log(&binarylog.ClientHalfClose{
+			OnClientSide: true,
+		})
+	}
+	// We never returned an error here for reasons.
+	return nil
+}
+
+func (cs *clientStream) finish(err error) {
+	if err == io.EOF {
+		// Ending a stream with EOF indicates a success.
+		err = nil
+	}
+	cs.mu.Lock()
+	if cs.finished {
+		cs.mu.Unlock()
+		return
+	}
+	cs.finished = true
+	cs.commitAttemptLocked()
+	cs.mu.Unlock()
+	// For binary logging. only log cancel in finish (could be caused by RPC ctx
+	// canceled or ClientConn closed). Trailer will be logged in RecvMsg.
+	//
+	// Only one of cancel or trailer needs to be logged. In the cases where
+	// users don't call RecvMsg, users must have already canceled the RPC.
+	if cs.binlog != nil && status.Code(err) == codes.Canceled {
+		cs.binlog.Log(&binarylog.Cancel{
+			OnClientSide: true,
+		})
+	}
+	if err == nil {
+		cs.retryThrottler.successfulRPC()
+	}
+	if channelz.IsOn() {
+		if err != nil {
+			cs.cc.incrCallsFailed()
+		} else {
+			cs.cc.incrCallsSucceeded()
+		}
+	}
+	if cs.attempt != nil {
+		cs.attempt.finish(err)
+		// after functions all rely upon having a stream.
+		if cs.attempt.s != nil {
+			for _, o := range cs.opts {
+				o.after(cs.callInfo)
+			}
+		}
+	}
+	cs.cancel()
+}
+
+func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
+	cs := a.cs
+	if a.trInfo != nil {
+		a.mu.Lock()
+		if a.trInfo.tr != nil {
+			a.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
+		}
+		a.mu.Unlock()
+	}
+	if err := a.t.Write(a.s, hdr, payld, &transport.Options{Last: !cs.desc.ClientStreams}); err != nil {
+		if !cs.desc.ClientStreams {
+			// For non-client-streaming RPCs, we return nil instead of EOF on error
+			// because the generated code requires it.  finish is not called; RecvMsg()
+			// will call it with the stream's status independently.
+			return nil
+		}
+		return io.EOF
+	}
+	if a.statsHandler != nil {
+		a.statsHandler.HandleRPC(cs.ctx, outPayload(true, m, data, payld, time.Now()))
+	}
+	if channelz.IsOn() {
+		a.t.IncrMsgSent()
+	}
+	return nil
+}
+
+func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
+	cs := a.cs
+	if a.statsHandler != nil && payInfo == nil {
+		payInfo = &payloadInfo{}
+	}
+
+	if !a.decompSet {
+		// Block until we receive headers containing received message encoding.
+		if ct := a.s.RecvCompress(); ct != "" && ct != encoding.Identity {
+			if a.dc == nil || a.dc.Type() != ct {
+				// No configured decompressor, or it does not match the incoming
+				// message encoding; attempt to find a registered compressor that does.
+				a.dc = nil
+				a.decomp = encoding.GetCompressor(ct)
+			}
+		} else {
+			// No compression is used; disable our decompressor.
+			a.dc = nil
+		}
+		// Only initialize this state once per stream.
+		a.decompSet = true
+	}
+	err = recv(a.p, cs.codec, a.s, a.dc, m, *cs.callInfo.maxReceiveMessageSize, payInfo, a.decomp)
+	if err != nil {
+		if err == io.EOF {
+			if statusErr := a.s.Status().Err(); statusErr != nil {
+				return statusErr
+			}
+			return io.EOF // indicates successful end of stream.
+		}
+		return toRPCErr(err)
+	}
+	if a.trInfo != nil {
+		a.mu.Lock()
+		if a.trInfo.tr != nil {
+			a.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
+		}
+		a.mu.Unlock()
+	}
+	if a.statsHandler != nil {
+		a.statsHandler.HandleRPC(cs.ctx, &stats.InPayload{
+			Client:   true,
+			RecvTime: time.Now(),
+			Payload:  m,
+			// TODO truncate large payload.
+			Data:       payInfo.uncompressedBytes,
+			WireLength: payInfo.wireLength,
+			Length:     len(payInfo.uncompressedBytes),
+		})
+	}
+	if channelz.IsOn() {
+		a.t.IncrMsgRecv()
+	}
+	if cs.desc.ServerStreams {
+		// Subsequent messages should be received by subsequent RecvMsg calls.
+		return nil
+	}
+	// Special handling for non-server-stream rpcs.
+	// This recv expects EOF or errors, so we don't collect inPayload.
+	err = recv(a.p, cs.codec, a.s, a.dc, m, *cs.callInfo.maxReceiveMessageSize, nil, a.decomp)
+	if err == nil {
+		return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
+	}
+	if err == io.EOF {
+		return a.s.Status().Err() // non-server streaming Recv returns nil on success
+	}
+	return toRPCErr(err)
+}
+
+func (a *csAttempt) finish(err error) {
+	a.mu.Lock()
+	if a.finished {
+		a.mu.Unlock()
+		return
+	}
+	a.finished = true
+	if err == io.EOF {
+		// Ending a stream with EOF indicates a success.
+		err = nil
+	}
+	var tr metadata.MD
+	if a.s != nil {
+		a.t.CloseStream(a.s, err)
+		tr = a.s.Trailer()
+	}
+
+	if a.done != nil {
+		br := false
+		if a.s != nil {
+			br = a.s.BytesReceived()
+		}
+		a.done(balancer.DoneInfo{
+			Err:           err,
+			Trailer:       tr,
+			BytesSent:     a.s != nil,
+			BytesReceived: br,
+			ServerLoad:    balancerload.Parse(tr),
+		})
+	}
+	if a.statsHandler != nil {
+		end := &stats.End{
+			Client:    true,
+			BeginTime: a.cs.beginTime,
+			EndTime:   time.Now(),
+			Trailer:   tr,
+			Error:     err,
+		}
+		a.statsHandler.HandleRPC(a.cs.ctx, end)
+	}
+	if a.trInfo != nil && a.trInfo.tr != nil {
+		if err == nil {
+			a.trInfo.tr.LazyPrintf("RPC: [OK]")
+		} else {
+			a.trInfo.tr.LazyPrintf("RPC: [%v]", err)
+			a.trInfo.tr.SetError()
+		}
+		a.trInfo.tr.Finish()
+		a.trInfo.tr = nil
+	}
+	a.mu.Unlock()
+}
+
+// newClientStream creates a ClientStream with the specified transport, on the
+// given addrConn.
+//
+// It's expected that the given transport is either the same one in addrConn, or
+// is already closed. To avoid race, transport is specified separately, instead
+// of using ac.transpot.
+//
+// Main difference between this and ClientConn.NewStream:
+// - no retry
+// - no service config (or wait for service config)
+// - no tracing or stats
+func newNonRetryClientStream(ctx context.Context, desc *StreamDesc, method string, t transport.ClientTransport, ac *addrConn, opts ...CallOption) (_ ClientStream, err error) {
+	if t == nil {
+		// TODO: return RPC error here?
+		return nil, errors.New("transport provided is nil")
+	}
+	// defaultCallInfo contains unnecessary info(i.e. failfast, maxRetryRPCBufferSize), so we just initialize an empty struct.
+	c := &callInfo{}
+
+	// Possible context leak:
+	// The cancel function for the child context we create will only be called
+	// when RecvMsg returns a non-nil error, if the ClientConn is closed, or if
+	// an error is generated by SendMsg.
+	// https://github.com/grpc/grpc-go/issues/1818.
+	ctx, cancel := context.WithCancel(ctx)
+	defer func() {
+		if err != nil {
+			cancel()
+		}
+	}()
+
+	for _, o := range opts {
+		if err := o.before(c); err != nil {
+			return nil, toRPCErr(err)
+		}
+	}
+	c.maxReceiveMessageSize = getMaxSize(nil, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)
+	c.maxSendMessageSize = getMaxSize(nil, c.maxSendMessageSize, defaultServerMaxSendMessageSize)
+	if err := setCallInfoCodec(c); err != nil {
+		return nil, err
+	}
+
+	callHdr := &transport.CallHdr{
+		Host:           ac.cc.authority,
+		Method:         method,
+		ContentSubtype: c.contentSubtype,
+	}
+
+	// Set our outgoing compression according to the UseCompressor CallOption, if
+	// set.  In that case, also find the compressor from the encoding package.
+	// Otherwise, use the compressor configured by the WithCompressor DialOption,
+	// if set.
+	var cp Compressor
+	var comp encoding.Compressor
+	if ct := c.compressorType; ct != "" {
+		callHdr.SendCompress = ct
+		if ct != encoding.Identity {
+			comp = encoding.GetCompressor(ct)
+			if comp == nil {
+				return nil, status.Errorf(codes.Internal, "grpc: Compressor is not installed for requested grpc-encoding %q", ct)
+			}
+		}
+	} else if ac.cc.dopts.cp != nil {
+		callHdr.SendCompress = ac.cc.dopts.cp.Type()
+		cp = ac.cc.dopts.cp
+	}
+	if c.creds != nil {
+		callHdr.Creds = c.creds
+	}
+
+	// Use a special addrConnStream to avoid retry.
+	as := &addrConnStream{
+		callHdr:  callHdr,
+		ac:       ac,
+		ctx:      ctx,
+		cancel:   cancel,
+		opts:     opts,
+		callInfo: c,
+		desc:     desc,
+		codec:    c.codec,
+		cp:       cp,
+		comp:     comp,
+		t:        t,
+	}
+
+	as.callInfo.stream = as
+	s, err := as.t.NewStream(as.ctx, as.callHdr)
+	if err != nil {
+		err = toRPCErr(err)
+		return nil, err
+	}
+	as.s = s
+	as.p = &parser{r: s}
+	ac.incrCallsStarted()
+	if desc != unaryStreamDesc {
+		// Listen on cc and stream contexts to cleanup when the user closes the
+		// ClientConn or cancels the stream context.  In all other cases, an error
+		// should already be injected into the recv buffer by the transport, which
+		// the client will eventually receive, and then we will cancel the stream's
+		// context in clientStream.finish.
+		go func() {
+			select {
+			case <-ac.ctx.Done():
+				as.finish(status.Error(codes.Canceled, "grpc: the SubConn is closing"))
+			case <-ctx.Done():
+				as.finish(toRPCErr(ctx.Err()))
+			}
+		}()
+	}
+	return as, nil
+}
+
+type addrConnStream struct {
+	s         *transport.Stream
+	ac        *addrConn
+	callHdr   *transport.CallHdr
+	cancel    context.CancelFunc
+	opts      []CallOption
+	callInfo  *callInfo
+	t         transport.ClientTransport
+	ctx       context.Context
+	sentLast  bool
+	desc      *StreamDesc
+	codec     baseCodec
+	cp        Compressor
+	comp      encoding.Compressor
+	decompSet bool
+	dc        Decompressor
+	decomp    encoding.Compressor
+	p         *parser
+	mu        sync.Mutex
+	finished  bool
+}
+
+func (as *addrConnStream) Header() (metadata.MD, error) {
+	m, err := as.s.Header()
+	if err != nil {
+		as.finish(toRPCErr(err))
+	}
+	return m, err
+}
+
+func (as *addrConnStream) Trailer() metadata.MD {
+	return as.s.Trailer()
+}
+
+func (as *addrConnStream) CloseSend() error {
+	if as.sentLast {
+		// TODO: return an error and finish the stream instead, due to API misuse?
+		return nil
+	}
+	as.sentLast = true
+
+	as.t.Write(as.s, nil, nil, &transport.Options{Last: true})
+	// Always return nil; io.EOF is the only error that might make sense
+	// instead, but there is no need to signal the client to call RecvMsg
+	// as the only use left for the stream after CloseSend is to call
+	// RecvMsg.  This also matches historical behavior.
+	return nil
+}
+
+func (as *addrConnStream) Context() context.Context {
+	return as.s.Context()
+}
+
+func (as *addrConnStream) SendMsg(m interface{}) (err error) {
+	defer func() {
+		if err != nil && err != io.EOF {
+			// Call finish on the client stream for errors generated by this SendMsg
+			// call, as these indicate problems created by this client.  (Transport
+			// errors are converted to an io.EOF error in csAttempt.sendMsg; the real
+			// error will be returned from RecvMsg eventually in that case, or be
+			// retried.)
+			as.finish(err)
+		}
+	}()
+	if as.sentLast {
+		return status.Errorf(codes.Internal, "SendMsg called after CloseSend")
+	}
+	if !as.desc.ClientStreams {
+		as.sentLast = true
+	}
+
+	// load hdr, payload, data
+	hdr, payld, _, err := prepareMsg(m, as.codec, as.cp, as.comp)
+	if err != nil {
+		return err
+	}
+
+	// TODO(dfawley): should we be checking len(data) instead?
+	if len(payld) > *as.callInfo.maxSendMessageSize {
+		return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payld), *as.callInfo.maxSendMessageSize)
+	}
+
+	if err := as.t.Write(as.s, hdr, payld, &transport.Options{Last: !as.desc.ClientStreams}); err != nil {
+		if !as.desc.ClientStreams {
+			// For non-client-streaming RPCs, we return nil instead of EOF on error
+			// because the generated code requires it.  finish is not called; RecvMsg()
+			// will call it with the stream's status independently.
+			return nil
+		}
+		return io.EOF
+	}
+
+	if channelz.IsOn() {
+		as.t.IncrMsgSent()
+	}
+	return nil
+}
+
+func (as *addrConnStream) RecvMsg(m interface{}) (err error) {
+	defer func() {
+		if err != nil || !as.desc.ServerStreams {
+			// err != nil or non-server-streaming indicates end of stream.
+			as.finish(err)
+		}
+	}()
+
+	if !as.decompSet {
+		// Block until we receive headers containing received message encoding.
+		if ct := as.s.RecvCompress(); ct != "" && ct != encoding.Identity {
+			if as.dc == nil || as.dc.Type() != ct {
+				// No configured decompressor, or it does not match the incoming
+				// message encoding; attempt to find a registered compressor that does.
+				as.dc = nil
+				as.decomp = encoding.GetCompressor(ct)
+			}
+		} else {
+			// No compression is used; disable our decompressor.
+			as.dc = nil
+		}
+		// Only initialize this state once per stream.
+		as.decompSet = true
+	}
+	err = recv(as.p, as.codec, as.s, as.dc, m, *as.callInfo.maxReceiveMessageSize, nil, as.decomp)
+	if err != nil {
+		if err == io.EOF {
+			if statusErr := as.s.Status().Err(); statusErr != nil {
+				return statusErr
+			}
+			return io.EOF // indicates successful end of stream.
+		}
+		return toRPCErr(err)
+	}
+
+	if channelz.IsOn() {
+		as.t.IncrMsgRecv()
+	}
+	if as.desc.ServerStreams {
+		// Subsequent messages should be received by subsequent RecvMsg calls.
+		return nil
+	}
+
+	// Special handling for non-server-stream rpcs.
+	// This recv expects EOF or errors, so we don't collect inPayload.
+	err = recv(as.p, as.codec, as.s, as.dc, m, *as.callInfo.maxReceiveMessageSize, nil, as.decomp)
+	if err == nil {
+		return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
+	}
+	if err == io.EOF {
+		return as.s.Status().Err() // non-server streaming Recv returns nil on success
+	}
+	return toRPCErr(err)
+}
+
+func (as *addrConnStream) finish(err error) {
+	as.mu.Lock()
+	if as.finished {
+		as.mu.Unlock()
+		return
+	}
+	as.finished = true
+	if err == io.EOF {
+		// Ending a stream with EOF indicates a success.
+		err = nil
+	}
+	if as.s != nil {
+		as.t.CloseStream(as.s, err)
+	}
+
+	if err != nil {
+		as.ac.incrCallsFailed()
+	} else {
+		as.ac.incrCallsSucceeded()
+	}
+	as.cancel()
+	as.mu.Unlock()
+}
+
+// ServerStream defines the server-side behavior of a streaming RPC.
+//
+// All errors returned from ServerStream methods are compatible with the
+// status package.
+type ServerStream interface {
+	// SetHeader sets the header metadata. It may be called multiple times.
+	// When call multiple times, all the provided metadata will be merged.
+	// All the metadata will be sent out when one of the following happens:
+	//  - ServerStream.SendHeader() is called;
+	//  - The first response is sent out;
+	//  - An RPC status is sent out (error or success).
+	SetHeader(metadata.MD) error
+	// SendHeader sends the header metadata.
+	// The provided md and headers set by SetHeader() will be sent.
+	// It fails if called multiple times.
+	SendHeader(metadata.MD) error
+	// SetTrailer sets the trailer metadata which will be sent with the RPC status.
+	// When called more than once, all the provided metadata will be merged.
+	SetTrailer(metadata.MD)
+	// Context returns the context for this stream.
+	Context() context.Context
+	// SendMsg sends a message. On error, SendMsg aborts the stream and the
+	// error is returned directly.
+	//
+	// SendMsg blocks until:
+	//   - There is sufficient flow control to schedule m with the transport, or
+	//   - The stream is done, or
+	//   - The stream breaks.
+	//
+	// SendMsg does not wait until the message is received by the client. An
+	// untimely stream closure may result in lost messages.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not safe
+	// to call SendMsg on the same stream in different goroutines.
+	SendMsg(m interface{}) error
+	// RecvMsg blocks until it receives a message into m or the stream is
+	// done. It returns io.EOF when the client has performed a CloseSend. On
+	// any non-EOF error, the stream is aborted and the error contains the
+	// RPC status.
+	//
+	// It is safe to have a goroutine calling SendMsg and another goroutine
+	// calling RecvMsg on the same stream at the same time, but it is not
+	// safe to call RecvMsg on the same stream in different goroutines.
+	RecvMsg(m interface{}) error
+}
+
+// serverStream implements a server side Stream.
+type serverStream struct {
+	ctx   context.Context
+	t     transport.ServerTransport
+	s     *transport.Stream
+	p     *parser
+	codec baseCodec
+
+	cp     Compressor
+	dc     Decompressor
+	comp   encoding.Compressor
+	decomp encoding.Compressor
+
+	maxReceiveMessageSize int
+	maxSendMessageSize    int
+	trInfo                *traceInfo
+
+	statsHandler stats.Handler
+
+	binlog *binarylog.MethodLogger
+	// serverHeaderBinlogged indicates whether server header has been logged. It
+	// will happen when one of the following two happens: stream.SendHeader(),
+	// stream.Send().
+	//
+	// It's only checked in send and sendHeader, doesn't need to be
+	// synchronized.
+	serverHeaderBinlogged bool
+
+	mu sync.Mutex // protects trInfo.tr after the service handler runs.
+}
+
+func (ss *serverStream) Context() context.Context {
+	return ss.ctx
+}
+
+func (ss *serverStream) SetHeader(md metadata.MD) error {
+	if md.Len() == 0 {
+		return nil
+	}
+	return ss.s.SetHeader(md)
+}
+
+func (ss *serverStream) SendHeader(md metadata.MD) error {
+	err := ss.t.WriteHeader(ss.s, md)
+	if ss.binlog != nil && !ss.serverHeaderBinlogged {
+		h, _ := ss.s.Header()
+		ss.binlog.Log(&binarylog.ServerHeader{
+			Header: h,
+		})
+		ss.serverHeaderBinlogged = true
+	}
+	return err
+}
+
+func (ss *serverStream) SetTrailer(md metadata.MD) {
+	if md.Len() == 0 {
+		return
+	}
+	ss.s.SetTrailer(md)
+}
+
+func (ss *serverStream) SendMsg(m interface{}) (err error) {
+	defer func() {
+		if ss.trInfo != nil {
+			ss.mu.Lock()
+			if ss.trInfo.tr != nil {
+				if err == nil {
+					ss.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
+				} else {
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.SetError()
+				}
+			}
+			ss.mu.Unlock()
+		}
+		if err != nil && err != io.EOF {
+			st, _ := status.FromError(toRPCErr(err))
+			ss.t.WriteStatus(ss.s, st)
+			// Non-user specified status was sent out. This should be an error
+			// case (as a server side Cancel maybe).
+			//
+			// This is not handled specifically now. User will return a final
+			// status from the service handler, we will log that error instead.
+			// This behavior is similar to an interceptor.
+		}
+		if channelz.IsOn() && err == nil {
+			ss.t.IncrMsgSent()
+		}
+	}()
+
+	// load hdr, payload, data
+	hdr, payload, data, err := prepareMsg(m, ss.codec, ss.cp, ss.comp)
+	if err != nil {
+		return err
+	}
+
+	// TODO(dfawley): should we be checking len(data) instead?
+	if len(payload) > ss.maxSendMessageSize {
+		return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payload), ss.maxSendMessageSize)
+	}
+	if err := ss.t.Write(ss.s, hdr, payload, &transport.Options{Last: false}); err != nil {
+		return toRPCErr(err)
+	}
+	if ss.binlog != nil {
+		if !ss.serverHeaderBinlogged {
+			h, _ := ss.s.Header()
+			ss.binlog.Log(&binarylog.ServerHeader{
+				Header: h,
+			})
+			ss.serverHeaderBinlogged = true
+		}
+		ss.binlog.Log(&binarylog.ServerMessage{
+			Message: data,
+		})
+	}
+	if ss.statsHandler != nil {
+		ss.statsHandler.HandleRPC(ss.s.Context(), outPayload(false, m, data, payload, time.Now()))
+	}
+	return nil
+}
+
+func (ss *serverStream) RecvMsg(m interface{}) (err error) {
+	defer func() {
+		if ss.trInfo != nil {
+			ss.mu.Lock()
+			if ss.trInfo.tr != nil {
+				if err == nil {
+					ss.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
+				} else if err != io.EOF {
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.SetError()
+				}
+			}
+			ss.mu.Unlock()
+		}
+		if err != nil && err != io.EOF {
+			st, _ := status.FromError(toRPCErr(err))
+			ss.t.WriteStatus(ss.s, st)
+			// Non-user specified status was sent out. This should be an error
+			// case (as a server side Cancel maybe).
+			//
+			// This is not handled specifically now. User will return a final
+			// status from the service handler, we will log that error instead.
+			// This behavior is similar to an interceptor.
+		}
+		if channelz.IsOn() && err == nil {
+			ss.t.IncrMsgRecv()
+		}
+	}()
+	var payInfo *payloadInfo
+	if ss.statsHandler != nil || ss.binlog != nil {
+		payInfo = &payloadInfo{}
+	}
+	if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxReceiveMessageSize, payInfo, ss.decomp); err != nil {
+		if err == io.EOF {
+			if ss.binlog != nil {
+				ss.binlog.Log(&binarylog.ClientHalfClose{})
+			}
+			return err
+		}
+		if err == io.ErrUnexpectedEOF {
+			err = status.Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
+		}
+		return toRPCErr(err)
+	}
+	if ss.statsHandler != nil {
+		ss.statsHandler.HandleRPC(ss.s.Context(), &stats.InPayload{
+			RecvTime: time.Now(),
+			Payload:  m,
+			// TODO truncate large payload.
+			Data:       payInfo.uncompressedBytes,
+			WireLength: payInfo.wireLength,
+			Length:     len(payInfo.uncompressedBytes),
+		})
+	}
+	if ss.binlog != nil {
+		ss.binlog.Log(&binarylog.ClientMessage{
+			Message: payInfo.uncompressedBytes,
+		})
+	}
+	return nil
+}
+
+// MethodFromServerStream returns the method string for the input stream.
+// The returned string is in the format of "/service/method".
+func MethodFromServerStream(stream ServerStream) (string, bool) {
+	return Method(stream.Context())
+}
+
+// prepareMsg returns the hdr, payload and data
+// using the compressors passed or using the
+// passed preparedmsg
+func prepareMsg(m interface{}, codec baseCodec, cp Compressor, comp encoding.Compressor) (hdr, payload, data []byte, err error) {
+	if preparedMsg, ok := m.(*PreparedMsg); ok {
+		return preparedMsg.hdr, preparedMsg.payload, preparedMsg.encodedData, nil
+	}
+	// The input interface is not a prepared msg.
+	// Marshal and Compress the data at this point
+	data, err = encode(codec, m)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	compData, err := compress(data, cp, comp)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+	hdr, payload = msgHeader(data, compData)
+	return hdr, payload, data, nil
+}
diff --git a/vendor/google.golang.org/grpc/tap/tap.go b/vendor/google.golang.org/grpc/tap/tap.go
new file mode 100644
index 0000000..584360f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/tap/tap.go
@@ -0,0 +1,51 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package tap defines the function handles which are executed on the transport
+// layer of gRPC-Go and related information. Everything here is EXPERIMENTAL.
+package tap
+
+import (
+	"context"
+)
+
+// Info defines the relevant information needed by the handles.
+type Info struct {
+	// FullMethodName is the string of grpc method (in the format of
+	// /package.service/method).
+	FullMethodName string
+	// TODO: More to be added.
+}
+
+// ServerInHandle defines the function which runs before a new stream is created
+// on the server side. If it returns a non-nil error, the stream will not be
+// created and a RST_STREAM will be sent back to the client with REFUSED_STREAM.
+// The client will receive an RPC error "code = Unavailable, desc = stream
+// terminated by RST_STREAM with error code: REFUSED_STREAM".
+//
+// It's intended to be used in situations where you don't want to waste the
+// resources to accept the new stream (e.g. rate-limiting). And the content of
+// the error will be ignored and won't be sent back to the client. For other
+// general usages, please use interceptors.
+//
+// Note that it is executed in the per-connection I/O goroutine(s) instead of
+// per-RPC goroutine. Therefore, users should NOT have any
+// blocking/time-consuming work in this handle. Otherwise all the RPCs would
+// slow down. Also, for the same reason, this handle won't be called
+// concurrently by gRPC.
+type ServerInHandle func(ctx context.Context, info *Info) (context.Context, error)
diff --git a/vendor/google.golang.org/grpc/trace.go b/vendor/google.golang.org/grpc/trace.go
new file mode 100644
index 0000000..0a57b99
--- /dev/null
+++ b/vendor/google.golang.org/grpc/trace.go
@@ -0,0 +1,126 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/net/trace"
+)
+
+// EnableTracing controls whether to trace RPCs using the golang.org/x/net/trace package.
+// This should only be set before any RPCs are sent or received by this program.
+var EnableTracing bool
+
+// methodFamily returns the trace family for the given method.
+// It turns "/pkg.Service/GetFoo" into "pkg.Service".
+func methodFamily(m string) string {
+	m = strings.TrimPrefix(m, "/") // remove leading slash
+	if i := strings.Index(m, "/"); i >= 0 {
+		m = m[:i] // remove everything from second slash
+	}
+	if i := strings.LastIndex(m, "."); i >= 0 {
+		m = m[i+1:] // cut down to last dotted component
+	}
+	return m
+}
+
+// traceInfo contains tracing information for an RPC.
+type traceInfo struct {
+	tr        trace.Trace
+	firstLine firstLine
+}
+
+// firstLine is the first line of an RPC trace.
+// It may be mutated after construction; remoteAddr specifically may change
+// during client-side use.
+type firstLine struct {
+	mu         sync.Mutex
+	client     bool // whether this is a client (outgoing) RPC
+	remoteAddr net.Addr
+	deadline   time.Duration // may be zero
+}
+
+func (f *firstLine) SetRemoteAddr(addr net.Addr) {
+	f.mu.Lock()
+	f.remoteAddr = addr
+	f.mu.Unlock()
+}
+
+func (f *firstLine) String() string {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+
+	var line bytes.Buffer
+	io.WriteString(&line, "RPC: ")
+	if f.client {
+		io.WriteString(&line, "to")
+	} else {
+		io.WriteString(&line, "from")
+	}
+	fmt.Fprintf(&line, " %v deadline:", f.remoteAddr)
+	if f.deadline != 0 {
+		fmt.Fprint(&line, f.deadline)
+	} else {
+		io.WriteString(&line, "none")
+	}
+	return line.String()
+}
+
+const truncateSize = 100
+
+func truncate(x string, l int) string {
+	if l > len(x) {
+		return x
+	}
+	return x[:l]
+}
+
+// payload represents an RPC request or response payload.
+type payload struct {
+	sent bool        // whether this is an outgoing payload
+	msg  interface{} // e.g. a proto.Message
+	// TODO(dsymonds): add stringifying info to codec, and limit how much we hold here?
+}
+
+func (p payload) String() string {
+	if p.sent {
+		return truncate(fmt.Sprintf("sent: %v", p.msg), truncateSize)
+	}
+	return truncate(fmt.Sprintf("recv: %v", p.msg), truncateSize)
+}
+
+type fmtStringer struct {
+	format string
+	a      []interface{}
+}
+
+func (f *fmtStringer) String() string {
+	return fmt.Sprintf(f.format, f.a...)
+}
+
+type stringer string
+
+func (s stringer) String() string { return string(s) }
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
new file mode 100644
index 0000000..1d3b043
--- /dev/null
+++ b/vendor/google.golang.org/grpc/version.go
@@ -0,0 +1,22 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+// Version is the current grpc version.
+const Version = "1.26.0"
diff --git a/vendor/google.golang.org/grpc/vet.sh b/vendor/google.golang.org/grpc/vet.sh
new file mode 100644
index 0000000..798921a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/vet.sh
@@ -0,0 +1,159 @@
+#!/bin/bash
+
+if [[ `uname -a` = *"Darwin"* ]]; then
+  echo "It seems you are running on Mac. This script does not work on Mac. See https://github.com/grpc/grpc-go/issues/2047"
+  exit 1
+fi
+
+set -ex  # Exit on error; debugging enabled.
+set -o pipefail  # Fail a pipe if any sub-command fails.
+
+die() {
+  echo "$@" >&2
+  exit 1
+}
+
+fail_on_output() {
+  tee /dev/stderr | (! read)
+}
+
+# Check to make sure it's safe to modify the user's git repo.
+git status --porcelain | fail_on_output
+
+# Undo any edits made by this script.
+cleanup() {
+  git reset --hard HEAD
+}
+trap cleanup EXIT
+
+PATH="${GOPATH}/bin:${GOROOT}/bin:${PATH}"
+
+if [[ "$1" = "-install" ]]; then
+  # Check for module support
+  if go help mod >& /dev/null; then
+    # Install the pinned versions as defined in module tools.
+    pushd ./test/tools
+    go install \
+      golang.org/x/lint/golint \
+      golang.org/x/tools/cmd/goimports \
+      honnef.co/go/tools/cmd/staticcheck \
+      github.com/client9/misspell/cmd/misspell \
+      github.com/golang/protobuf/protoc-gen-go
+    popd
+  else
+    # Ye olde `go get` incantation.
+    # Note: this gets the latest version of all tools (vs. the pinned versions
+    # with Go modules).
+    go get -u \
+      golang.org/x/lint/golint \
+      golang.org/x/tools/cmd/goimports \
+      honnef.co/go/tools/cmd/staticcheck \
+      github.com/client9/misspell/cmd/misspell \
+      github.com/golang/protobuf/protoc-gen-go
+  fi
+  if [[ -z "${VET_SKIP_PROTO}" ]]; then
+    if [[ "${TRAVIS}" = "true" ]]; then
+      PROTOBUF_VERSION=3.3.0
+      PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
+      pushd /home/travis
+      wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
+      unzip ${PROTOC_FILENAME}
+      bin/protoc --version
+      popd
+    elif ! which protoc > /dev/null; then
+      die "Please install protoc into your path"
+    fi
+  fi
+  exit 0
+elif [[ "$#" -ne 0 ]]; then
+  die "Unknown argument(s): $*"
+fi
+
+# - Ensure all source files contain a copyright message.
+(! git grep -L "\(Copyright [0-9]\{4,\} gRPC authors\)\|DO NOT EDIT" -- '*.go')
+
+# - Make sure all tests in grpc and grpc/test use leakcheck via Teardown.
+(! grep 'func Test[^(]' *_test.go)
+(! grep 'func Test[^(]' test/*.go)
+
+# - Do not import x/net/context.
+(! git grep -l 'x/net/context' -- "*.go")
+
+# - Do not import math/rand for real library code.  Use internal/grpcrand for
+#   thread safety.
+git grep -l '"math/rand"' -- "*.go" 2>&1 | (! grep -v '^examples\|^stress\|grpcrand\|wrr_test')
+
+# - Ensure all ptypes proto packages are renamed when importing.
+(! git grep "\(import \|^\s*\)\"github.com/golang/protobuf/ptypes/" -- "*.go")
+
+# - Check imports that are illegal in appengine (until Go 1.11).
+# TODO: Remove when we drop Go 1.10 support
+go list -f {{.Dir}} ./... | xargs go run test/go_vet/vet.go
+
+# - gofmt, goimports, golint (with exceptions for generated code), go vet.
+gofmt -s -d -l . 2>&1 | fail_on_output
+goimports -l . 2>&1 | (! grep -vE "(_mock|\.pb)\.go")
+golint ./... 2>&1 | (! grep -vE "(_mock|\.pb)\.go:")
+go vet -all .
+
+misspell -error .
+
+# - Check that generated proto files are up to date.
+if [[ -z "${VET_SKIP_PROTO}" ]]; then
+  PATH="/home/travis/bin:${PATH}" make proto && \
+    git status --porcelain 2>&1 | fail_on_output || \
+    (git status; git --no-pager diff; exit 1)
+fi
+
+# - Check that our module is tidy.
+if go help mod >& /dev/null; then
+  go mod tidy && \
+    git status --porcelain 2>&1 | fail_on_output || \
+    (git status; git --no-pager diff; exit 1)
+fi
+
+# - Collection of static analysis checks
+#
+# TODO(dfawley): don't use deprecated functions in examples or first-party
+# plugins.
+SC_OUT="$(mktemp)"
+staticcheck -go 1.9 -checks 'inherit,-ST1015' ./... > "${SC_OUT}" || true
+# Error if anything other than deprecation warnings are printed.
+(! grep -v "is deprecated:.*SA1019" "${SC_OUT}")
+# Only ignore the following deprecated types/fields/functions.
+(! grep -Fv '.HandleResolvedAddrs
+.HandleSubConnStateChange
+.HeaderMap
+.NewAddress
+.NewServiceConfig
+.Metadata is deprecated: use Attributes
+.Type is deprecated: use Attributes
+.UpdateBalancerState
+balancer.Picker
+grpc.CallCustomCodec
+grpc.Code
+grpc.Compressor
+grpc.Decompressor
+grpc.MaxMsgSize
+grpc.MethodConfig
+grpc.NewGZIPCompressor
+grpc.NewGZIPDecompressor
+grpc.RPCCompressor
+grpc.RPCDecompressor
+grpc.RoundRobin
+grpc.ServiceConfig
+grpc.WithBalancer
+grpc.WithBalancerName
+grpc.WithCompressor
+grpc.WithDecompressor
+grpc.WithDialer
+grpc.WithMaxMsgSize
+grpc.WithServiceConfig
+grpc.WithTimeout
+http.CloseNotifier
+naming.Resolver
+naming.Update
+naming.Watcher
+resolver.Backend
+resolver.GRPCLB' "${SC_OUT}"
+)
diff --git a/vendor/google.golang.org/protobuf/AUTHORS b/vendor/google.golang.org/protobuf/AUTHORS
new file mode 100644
index 0000000..2b00ddb
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/AUTHORS
@@ -0,0 +1,3 @@
+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at https://tip.golang.org/AUTHORS.
diff --git a/vendor/google.golang.org/protobuf/CONTRIBUTORS b/vendor/google.golang.org/protobuf/CONTRIBUTORS
new file mode 100644
index 0000000..1fbd3e9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/CONTRIBUTORS
@@ -0,0 +1,3 @@
+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at https://tip.golang.org/CONTRIBUTORS.
diff --git a/vendor/google.golang.org/protobuf/LICENSE b/vendor/google.golang.org/protobuf/LICENSE
new file mode 100644
index 0000000..49ea0f9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2018 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/google.golang.org/protobuf/PATENTS b/vendor/google.golang.org/protobuf/PATENTS
new file mode 100644
index 0000000..7330990
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/decode.go b/vendor/google.golang.org/protobuf/encoding/prototext/decode.go
new file mode 100644
index 0000000..77dbe1b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/decode.go
@@ -0,0 +1,789 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package prototext
+
+import (
+	"fmt"
+	"strings"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/encoding/text"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/fieldnum"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/internal/set"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// Unmarshal reads the given []byte into the given proto.Message.
+func Unmarshal(b []byte, m proto.Message) error {
+	return UnmarshalOptions{}.Unmarshal(b, m)
+}
+
+// UnmarshalOptions is a configurable textproto format unmarshaler.
+type UnmarshalOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// AllowPartial accepts input for messages that will result in missing
+	// required fields. If AllowPartial is false (the default), Unmarshal will
+	// return error if there are any missing required fields.
+	AllowPartial bool
+
+	// DiscardUnknown specifies whether to ignore unknown fields when parsing.
+	// An unknown field is any field whose field name or field number does not
+	// resolve to any known or extension field in the message.
+	// By default, unmarshal rejects unknown fields as an error.
+	DiscardUnknown bool
+
+	// Resolver is used for looking up types when unmarshaling
+	// google.protobuf.Any messages or extension fields.
+	// If nil, this defaults to using protoregistry.GlobalTypes.
+	Resolver interface {
+		protoregistry.MessageTypeResolver
+		protoregistry.ExtensionTypeResolver
+	}
+}
+
+// Unmarshal reads the given []byte and populates the given proto.Message using options in
+// UnmarshalOptions object.
+func (o UnmarshalOptions) Unmarshal(b []byte, m proto.Message) error {
+	proto.Reset(m)
+
+	if o.Resolver == nil {
+		o.Resolver = protoregistry.GlobalTypes
+	}
+
+	dec := decoder{text.NewDecoder(b), o}
+	if err := dec.unmarshalMessage(m.ProtoReflect(), false); err != nil {
+		return err
+	}
+	if o.AllowPartial {
+		return nil
+	}
+	return proto.CheckInitialized(m)
+}
+
+type decoder struct {
+	*text.Decoder
+	opts UnmarshalOptions
+}
+
+// newError returns an error object with position info.
+func (d decoder) newError(pos int, f string, x ...interface{}) error {
+	line, column := d.Position(pos)
+	head := fmt.Sprintf("(line %d:%d): ", line, column)
+	return errors.New(head+f, x...)
+}
+
+// unexpectedTokenError returns a syntax error for the given unexpected token.
+func (d decoder) unexpectedTokenError(tok text.Token) error {
+	return d.syntaxError(tok.Pos(), "unexpected token: %s", tok.RawString())
+}
+
+// syntaxError returns a syntax error for given position.
+func (d decoder) syntaxError(pos int, f string, x ...interface{}) error {
+	line, column := d.Position(pos)
+	head := fmt.Sprintf("syntax error (line %d:%d): ", line, column)
+	return errors.New(head+f, x...)
+}
+
+// unmarshalMessage unmarshals into the given protoreflect.Message.
+func (d decoder) unmarshalMessage(m pref.Message, checkDelims bool) error {
+	messageDesc := m.Descriptor()
+	if !flags.ProtoLegacy && messageset.IsMessageSet(messageDesc) {
+		return errors.New("no support for proto1 MessageSets")
+	}
+
+	if messageDesc.FullName() == "google.protobuf.Any" {
+		return d.unmarshalAny(m, checkDelims)
+	}
+
+	if checkDelims {
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+
+		if tok.Kind() != text.MessageOpen {
+			return d.unexpectedTokenError(tok)
+		}
+	}
+
+	var seenNums set.Ints
+	var seenOneofs set.Ints
+	fieldDescs := messageDesc.Fields()
+
+	for {
+		// Read field name.
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+		switch typ := tok.Kind(); typ {
+		case text.Name:
+			// Continue below.
+		case text.EOF:
+			if checkDelims {
+				return text.ErrUnexpectedEOF
+			}
+			return nil
+		default:
+			if checkDelims && typ == text.MessageClose {
+				return nil
+			}
+			return d.unexpectedTokenError(tok)
+		}
+
+		// Resolve the field descriptor.
+		var name pref.Name
+		var fd pref.FieldDescriptor
+		var xt pref.ExtensionType
+		var xtErr error
+		var isFieldNumberName bool
+
+		switch tok.NameKind() {
+		case text.IdentName:
+			name = pref.Name(tok.IdentName())
+			fd = fieldDescs.ByName(name)
+			if fd == nil {
+				// The proto name of a group field is in all lowercase,
+				// while the textproto field name is the group message name.
+				gd := fieldDescs.ByName(pref.Name(strings.ToLower(string(name))))
+				if gd != nil && gd.Kind() == pref.GroupKind && gd.Message().Name() == name {
+					fd = gd
+				}
+			} else if fd.Kind() == pref.GroupKind && fd.Message().Name() != name {
+				fd = nil // reset since field name is actually the message name
+			}
+
+		case text.TypeName:
+			// Handle extensions only. This code path is not for Any.
+			xt, xtErr = d.findExtension(pref.FullName(tok.TypeName()))
+
+		case text.FieldNumber:
+			isFieldNumberName = true
+			num := pref.FieldNumber(tok.FieldNumber())
+			if !num.IsValid() {
+				return d.newError(tok.Pos(), "invalid field number: %d", num)
+			}
+			fd = fieldDescs.ByNumber(num)
+			if fd == nil {
+				xt, xtErr = d.opts.Resolver.FindExtensionByNumber(messageDesc.FullName(), num)
+			}
+		}
+
+		if xt != nil {
+			fd = xt.TypeDescriptor()
+			if !messageDesc.ExtensionRanges().Has(fd.Number()) || fd.ContainingMessage().FullName() != messageDesc.FullName() {
+				return d.newError(tok.Pos(), "message %v cannot be extended by %v", messageDesc.FullName(), fd.FullName())
+			}
+		} else if xtErr != nil && xtErr != protoregistry.NotFound {
+			return d.newError(tok.Pos(), "unable to resolve [%s]: %v", tok.RawString(), xtErr)
+		}
+		if flags.ProtoLegacy {
+			if fd != nil && fd.IsWeak() && fd.Message().IsPlaceholder() {
+				fd = nil // reset since the weak reference is not linked in
+			}
+		}
+
+		// Handle unknown fields.
+		if fd == nil {
+			if d.opts.DiscardUnknown || messageDesc.ReservedNames().Has(name) {
+				d.skipValue()
+				continue
+			}
+			return d.newError(tok.Pos(), "unknown field: %v", tok.RawString())
+		}
+
+		// Handle fields identified by field number.
+		if isFieldNumberName {
+			// TODO: Add an option to permit parsing field numbers.
+			//
+			// This requires careful thought as the MarshalOptions.EmitUnknown
+			// option allows formatting unknown fields as the field number and the
+			// best-effort textual representation of the field value.  In that case,
+			// it may not be possible to unmarshal the value from a parser that does
+			// have information about the unknown field.
+			return d.newError(tok.Pos(), "cannot specify field by number: %v", tok.RawString())
+		}
+
+		switch {
+		case fd.IsList():
+			kind := fd.Kind()
+			if kind != pref.MessageKind && kind != pref.GroupKind && !tok.HasSeparator() {
+				return d.syntaxError(tok.Pos(), "missing field separator :")
+			}
+
+			list := m.Mutable(fd).List()
+			if err := d.unmarshalList(fd, list); err != nil {
+				return err
+			}
+
+		case fd.IsMap():
+			mmap := m.Mutable(fd).Map()
+			if err := d.unmarshalMap(fd, mmap); err != nil {
+				return err
+			}
+
+		default:
+			kind := fd.Kind()
+			if kind != pref.MessageKind && kind != pref.GroupKind && !tok.HasSeparator() {
+				return d.syntaxError(tok.Pos(), "missing field separator :")
+			}
+
+			// If field is a oneof, check if it has already been set.
+			if od := fd.ContainingOneof(); od != nil {
+				idx := uint64(od.Index())
+				if seenOneofs.Has(idx) {
+					return d.newError(tok.Pos(), "error parsing %q, oneof %v is already set", tok.RawString(), od.FullName())
+				}
+				seenOneofs.Set(idx)
+			}
+
+			num := uint64(fd.Number())
+			if seenNums.Has(num) {
+				return d.newError(tok.Pos(), "non-repeated field %q is repeated", tok.RawString())
+			}
+
+			if err := d.unmarshalSingular(fd, m); err != nil {
+				return err
+			}
+			seenNums.Set(num)
+		}
+	}
+
+	return nil
+}
+
+// findExtension returns protoreflect.ExtensionType from the Resolver if found.
+func (d decoder) findExtension(xtName pref.FullName) (pref.ExtensionType, error) {
+	xt, err := d.opts.Resolver.FindExtensionByName(xtName)
+	if err == nil {
+		return xt, nil
+	}
+	return messageset.FindMessageSetExtension(d.opts.Resolver, xtName)
+}
+
+// unmarshalSingular unmarshals a non-repeated field value specified by the
+// given FieldDescriptor.
+func (d decoder) unmarshalSingular(fd pref.FieldDescriptor, m pref.Message) error {
+	var val pref.Value
+	var err error
+	switch fd.Kind() {
+	case pref.MessageKind, pref.GroupKind:
+		val = m.NewField(fd)
+		err = d.unmarshalMessage(val.Message(), true)
+	default:
+		val, err = d.unmarshalScalar(fd)
+	}
+	if err == nil {
+		m.Set(fd, val)
+	}
+	return err
+}
+
+// unmarshalScalar unmarshals a scalar/enum protoreflect.Value specified by the
+// given FieldDescriptor.
+func (d decoder) unmarshalScalar(fd pref.FieldDescriptor) (pref.Value, error) {
+	tok, err := d.Read()
+	if err != nil {
+		return pref.Value{}, err
+	}
+
+	if tok.Kind() != text.Scalar {
+		return pref.Value{}, d.unexpectedTokenError(tok)
+	}
+
+	kind := fd.Kind()
+	switch kind {
+	case pref.BoolKind:
+		if b, ok := tok.Bool(); ok {
+			return pref.ValueOfBool(b), nil
+		}
+
+	case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
+		if n, ok := tok.Int32(); ok {
+			return pref.ValueOfInt32(n), nil
+		}
+
+	case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+		if n, ok := tok.Int64(); ok {
+			return pref.ValueOfInt64(n), nil
+		}
+
+	case pref.Uint32Kind, pref.Fixed32Kind:
+		if n, ok := tok.Uint32(); ok {
+			return pref.ValueOfUint32(n), nil
+		}
+
+	case pref.Uint64Kind, pref.Fixed64Kind:
+		if n, ok := tok.Uint64(); ok {
+			return pref.ValueOfUint64(n), nil
+		}
+
+	case pref.FloatKind:
+		if n, ok := tok.Float32(); ok {
+			return pref.ValueOfFloat32(n), nil
+		}
+
+	case pref.DoubleKind:
+		if n, ok := tok.Float64(); ok {
+			return pref.ValueOfFloat64(n), nil
+		}
+
+	case pref.StringKind:
+		if s, ok := tok.String(); ok {
+			if strs.EnforceUTF8(fd) && !utf8.ValidString(s) {
+				return pref.Value{}, d.newError(tok.Pos(), "contains invalid UTF-8")
+			}
+			return pref.ValueOfString(s), nil
+		}
+
+	case pref.BytesKind:
+		if b, ok := tok.String(); ok {
+			return pref.ValueOfBytes([]byte(b)), nil
+		}
+
+	case pref.EnumKind:
+		if lit, ok := tok.Enum(); ok {
+			// Lookup EnumNumber based on name.
+			if enumVal := fd.Enum().Values().ByName(pref.Name(lit)); enumVal != nil {
+				return pref.ValueOfEnum(enumVal.Number()), nil
+			}
+		}
+		if num, ok := tok.Int32(); ok {
+			return pref.ValueOfEnum(pref.EnumNumber(num)), nil
+		}
+
+	default:
+		panic(fmt.Sprintf("invalid scalar kind %v", kind))
+	}
+
+	return pref.Value{}, d.newError(tok.Pos(), "invalid value for %v type: %v", kind, tok.RawString())
+}
+
+// unmarshalList unmarshals into given protoreflect.List. A list value can
+// either be in [] syntax or simply just a single scalar/message value.
+func (d decoder) unmarshalList(fd pref.FieldDescriptor, list pref.List) error {
+	tok, err := d.Peek()
+	if err != nil {
+		return err
+	}
+
+	switch fd.Kind() {
+	case pref.MessageKind, pref.GroupKind:
+		switch tok.Kind() {
+		case text.ListOpen:
+			d.Read()
+			for {
+				tok, err := d.Peek()
+				if err != nil {
+					return err
+				}
+
+				switch tok.Kind() {
+				case text.ListClose:
+					d.Read()
+					return nil
+				case text.MessageOpen:
+					pval := list.NewElement()
+					if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+						return err
+					}
+					list.Append(pval)
+				default:
+					return d.unexpectedTokenError(tok)
+				}
+			}
+
+		case text.MessageOpen:
+			pval := list.NewElement()
+			if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+				return err
+			}
+			list.Append(pval)
+			return nil
+		}
+
+	default:
+		switch tok.Kind() {
+		case text.ListOpen:
+			d.Read()
+			for {
+				tok, err := d.Peek()
+				if err != nil {
+					return err
+				}
+
+				switch tok.Kind() {
+				case text.ListClose:
+					d.Read()
+					return nil
+				case text.Scalar:
+					pval, err := d.unmarshalScalar(fd)
+					if err != nil {
+						return err
+					}
+					list.Append(pval)
+				default:
+					return d.unexpectedTokenError(tok)
+				}
+			}
+
+		case text.Scalar:
+			pval, err := d.unmarshalScalar(fd)
+			if err != nil {
+				return err
+			}
+			list.Append(pval)
+			return nil
+		}
+	}
+
+	return d.unexpectedTokenError(tok)
+}
+
+// unmarshalMap unmarshals into given protoreflect.Map. A map value is a
+// textproto message containing {key: <kvalue>, value: <mvalue>}.
+func (d decoder) unmarshalMap(fd pref.FieldDescriptor, mmap pref.Map) error {
+	// Determine ahead whether map entry is a scalar type or a message type in
+	// order to call the appropriate unmarshalMapValue func inside
+	// unmarshalMapEntry.
+	var unmarshalMapValue func() (pref.Value, error)
+	switch fd.MapValue().Kind() {
+	case pref.MessageKind, pref.GroupKind:
+		unmarshalMapValue = func() (pref.Value, error) {
+			pval := mmap.NewValue()
+			if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+				return pref.Value{}, err
+			}
+			return pval, nil
+		}
+	default:
+		unmarshalMapValue = func() (pref.Value, error) {
+			return d.unmarshalScalar(fd.MapValue())
+		}
+	}
+
+	tok, err := d.Read()
+	if err != nil {
+		return err
+	}
+	switch tok.Kind() {
+	case text.MessageOpen:
+		return d.unmarshalMapEntry(fd, mmap, unmarshalMapValue)
+
+	case text.ListOpen:
+		for {
+			tok, err := d.Read()
+			if err != nil {
+				return err
+			}
+			switch tok.Kind() {
+			case text.ListClose:
+				return nil
+			case text.MessageOpen:
+				if err := d.unmarshalMapEntry(fd, mmap, unmarshalMapValue); err != nil {
+					return err
+				}
+			default:
+				return d.unexpectedTokenError(tok)
+			}
+		}
+
+	default:
+		return d.unexpectedTokenError(tok)
+	}
+}
+
+// unmarshalMap unmarshals into given protoreflect.Map. A map value is a
+// textproto message containing {key: <kvalue>, value: <mvalue>}.
+func (d decoder) unmarshalMapEntry(fd pref.FieldDescriptor, mmap pref.Map, unmarshalMapValue func() (pref.Value, error)) error {
+	var key pref.MapKey
+	var pval pref.Value
+Loop:
+	for {
+		// Read field name.
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+		switch tok.Kind() {
+		case text.Name:
+			if tok.NameKind() != text.IdentName {
+				if !d.opts.DiscardUnknown {
+					return d.newError(tok.Pos(), "unknown map entry field %q", tok.RawString())
+				}
+				d.skipValue()
+				continue Loop
+			}
+			// Continue below.
+		case text.MessageClose:
+			break Loop
+		default:
+			return d.unexpectedTokenError(tok)
+		}
+
+		name := tok.IdentName()
+		switch name {
+		case "key":
+			if !tok.HasSeparator() {
+				return d.syntaxError(tok.Pos(), "missing field separator :")
+			}
+			if key.IsValid() {
+				return d.newError(tok.Pos(), `map entry "key" cannot be repeated`)
+			}
+			val, err := d.unmarshalScalar(fd.MapKey())
+			if err != nil {
+				return err
+			}
+			key = val.MapKey()
+
+		case "value":
+			if kind := fd.MapValue().Kind(); (kind != pref.MessageKind) && (kind != pref.GroupKind) {
+				if !tok.HasSeparator() {
+					return d.syntaxError(tok.Pos(), "missing field separator :")
+				}
+			}
+			if pval.IsValid() {
+				return d.newError(tok.Pos(), `map entry "value" cannot be repeated`)
+			}
+			pval, err = unmarshalMapValue()
+			if err != nil {
+				return err
+			}
+
+		default:
+			if !d.opts.DiscardUnknown {
+				return d.newError(tok.Pos(), "unknown map entry field %q", name)
+			}
+			d.skipValue()
+		}
+	}
+
+	if !key.IsValid() {
+		key = fd.MapKey().Default().MapKey()
+	}
+	if !pval.IsValid() {
+		switch fd.MapValue().Kind() {
+		case pref.MessageKind, pref.GroupKind:
+			// If value field is not set for message/group types, construct an
+			// empty one as default.
+			pval = mmap.NewValue()
+		default:
+			pval = fd.MapValue().Default()
+		}
+	}
+	mmap.Set(key, pval)
+	return nil
+}
+
+// unmarshalAny unmarshals an Any textproto. It can either be in expanded form
+// or non-expanded form.
+func (d decoder) unmarshalAny(m pref.Message, checkDelims bool) error {
+	var typeURL string
+	var bValue []byte
+
+	// hasFields tracks which valid fields have been seen in the loop below in
+	// order to flag an error if there are duplicates or conflicts. It may
+	// contain the strings "type_url", "value" and "expanded".  The literal
+	// "expanded" is used to indicate that the expanded form has been
+	// encountered already.
+	hasFields := map[string]bool{}
+
+	if checkDelims {
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+
+		if tok.Kind() != text.MessageOpen {
+			return d.unexpectedTokenError(tok)
+		}
+	}
+
+Loop:
+	for {
+		// Read field name. Can only have 3 possible field names, i.e. type_url,
+		// value and type URL name inside [].
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+		if typ := tok.Kind(); typ != text.Name {
+			if checkDelims {
+				if typ == text.MessageClose {
+					break Loop
+				}
+			} else if typ == text.EOF {
+				break Loop
+			}
+			return d.unexpectedTokenError(tok)
+		}
+
+		switch tok.NameKind() {
+		case text.IdentName:
+			// Both type_url and value fields require field separator :.
+			if !tok.HasSeparator() {
+				return d.syntaxError(tok.Pos(), "missing field separator :")
+			}
+
+			switch tok.IdentName() {
+			case "type_url":
+				if hasFields["type_url"] {
+					return d.newError(tok.Pos(), "duplicate Any type_url field")
+				}
+				if hasFields["expanded"] {
+					return d.newError(tok.Pos(), "conflict with [%s] field", typeURL)
+				}
+				tok, err := d.Read()
+				if err != nil {
+					return err
+				}
+				var ok bool
+				typeURL, ok = tok.String()
+				if !ok {
+					return d.newError(tok.Pos(), "invalid Any type_url: %v", tok.RawString())
+				}
+				hasFields["type_url"] = true
+
+			case "value":
+				if hasFields["value"] {
+					return d.newError(tok.Pos(), "duplicate Any value field")
+				}
+				if hasFields["expanded"] {
+					return d.newError(tok.Pos(), "conflict with [%s] field", typeURL)
+				}
+				tok, err := d.Read()
+				if err != nil {
+					return err
+				}
+				s, ok := tok.String()
+				if !ok {
+					return d.newError(tok.Pos(), "invalid Any value: %v", tok.RawString())
+				}
+				bValue = []byte(s)
+				hasFields["value"] = true
+
+			default:
+				if !d.opts.DiscardUnknown {
+					return d.newError(tok.Pos(), "invalid field name %q in google.protobuf.Any message", tok.RawString())
+				}
+			}
+
+		case text.TypeName:
+			if hasFields["expanded"] {
+				return d.newError(tok.Pos(), "cannot have more than one type")
+			}
+			if hasFields["type_url"] {
+				return d.newError(tok.Pos(), "conflict with type_url field")
+			}
+			typeURL = tok.TypeName()
+			var err error
+			bValue, err = d.unmarshalExpandedAny(typeURL, tok.Pos())
+			if err != nil {
+				return err
+			}
+			hasFields["expanded"] = true
+
+		default:
+			if !d.opts.DiscardUnknown {
+				return d.newError(tok.Pos(), "invalid field name %q in google.protobuf.Any message", tok.RawString())
+			}
+		}
+	}
+
+	fds := m.Descriptor().Fields()
+	if len(typeURL) > 0 {
+		m.Set(fds.ByNumber(fieldnum.Any_TypeUrl), pref.ValueOfString(typeURL))
+	}
+	if len(bValue) > 0 {
+		m.Set(fds.ByNumber(fieldnum.Any_Value), pref.ValueOfBytes(bValue))
+	}
+	return nil
+}
+
+func (d decoder) unmarshalExpandedAny(typeURL string, pos int) ([]byte, error) {
+	mt, err := d.opts.Resolver.FindMessageByURL(typeURL)
+	if err != nil {
+		return nil, d.newError(pos, "unable to resolve message [%v]: %v", typeURL, err)
+	}
+	// Create new message for the embedded message type and unmarshal the value
+	// field into it.
+	m := mt.New()
+	if err := d.unmarshalMessage(m, true); err != nil {
+		return nil, err
+	}
+	// Serialize the embedded message and return the resulting bytes.
+	b, err := proto.MarshalOptions{
+		AllowPartial:  true, // Never check required fields inside an Any.
+		Deterministic: true,
+	}.Marshal(m.Interface())
+	if err != nil {
+		return nil, d.newError(pos, "error in marshaling message into Any.value: %v", err)
+	}
+	return b, nil
+}
+
+// skipValue makes the decoder parse a field value in order to advance the read
+// to the next field. It relies on Read returning an error if the types are not
+// in valid sequence.
+func (d decoder) skipValue() error {
+	tok, err := d.Read()
+	if err != nil {
+		return err
+	}
+	// Only need to continue reading for messages and lists.
+	switch tok.Kind() {
+	case text.MessageOpen:
+		return d.skipMessageValue()
+
+	case text.ListOpen:
+		for {
+			tok, err := d.Read()
+			if err != nil {
+				return err
+			}
+			switch tok.Kind() {
+			case text.ListClose:
+				return nil
+			case text.MessageOpen:
+				return d.skipMessageValue()
+			default:
+				// Skip items. This will not validate whether skipped values are
+				// of the same type or not, same behavior as C++
+				// TextFormat::Parser::AllowUnknownField(true) version 3.8.0.
+				if err := d.skipValue(); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// skipMessageValue makes the decoder parse and skip over all fields in a
+// message. It assumes that the previous read type is MessageOpen.
+func (d decoder) skipMessageValue() error {
+	for {
+		tok, err := d.Read()
+		if err != nil {
+			return err
+		}
+		switch tok.Kind() {
+		case text.MessageClose:
+			return nil
+		case text.Name:
+			if err := d.skipValue(); err != nil {
+				return err
+			}
+		}
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/doc.go b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
new file mode 100644
index 0000000..162b4f9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
@@ -0,0 +1,7 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package prototext marshals and unmarshals protocol buffer messages as the
+// textproto format.
+package prototext
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/encode.go b/vendor/google.golang.org/protobuf/encoding/prototext/encode.go
new file mode 100644
index 0000000..dece229
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/encode.go
@@ -0,0 +1,426 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package prototext
+
+import (
+	"fmt"
+	"sort"
+	"strconv"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/encoding/text"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/fieldnum"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/internal/mapsort"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+const defaultIndent = "  "
+
+// Format formats the message as a multiline string.
+// This function is only intended for human consumption and ignores errors.
+// Do not depend on the output being stable. It may change over time across
+// different versions of the program.
+func Format(m proto.Message) string {
+	return MarshalOptions{Multiline: true}.Format(m)
+}
+
+// Marshal writes the given proto.Message in textproto format using default
+// options. Do not depend on the output being stable. It may change over time
+// across different versions of the program.
+func Marshal(m proto.Message) ([]byte, error) {
+	return MarshalOptions{}.Marshal(m)
+}
+
+// MarshalOptions is a configurable text format marshaler.
+type MarshalOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// Multiline specifies whether the marshaler should format the output in
+	// indented-form with every textual element on a new line.
+	// If Indent is an empty string, then an arbitrary indent is chosen.
+	Multiline bool
+
+	// Indent specifies the set of indentation characters to use in a multiline
+	// formatted output such that every entry is preceded by Indent and
+	// terminated by a newline. If non-empty, then Multiline is treated as true.
+	// Indent can only be composed of space or tab characters.
+	Indent string
+
+	// EmitASCII specifies whether to format strings and bytes as ASCII only
+	// as opposed to using UTF-8 encoding when possible.
+	EmitASCII bool
+
+	// allowInvalidUTF8 specifies whether to permit the encoding of strings
+	// with invalid UTF-8. This is unexported as it is intended to only
+	// be specified by the Format method.
+	allowInvalidUTF8 bool
+
+	// AllowPartial allows messages that have missing required fields to marshal
+	// without returning an error. If AllowPartial is false (the default),
+	// Marshal will return error if there are any missing required fields.
+	AllowPartial bool
+
+	// EmitUnknown specifies whether to emit unknown fields in the output.
+	// If specified, the unmarshaler may be unable to parse the output.
+	// The default is to exclude unknown fields.
+	EmitUnknown bool
+
+	// Resolver is used for looking up types when expanding google.protobuf.Any
+	// messages. If nil, this defaults to using protoregistry.GlobalTypes.
+	Resolver interface {
+		protoregistry.ExtensionTypeResolver
+		protoregistry.MessageTypeResolver
+	}
+}
+
+// Format formats the message as a string.
+// This method is only intended for human consumption and ignores errors.
+// Do not depend on the output being stable. It may change over time across
+// different versions of the program.
+func (o MarshalOptions) Format(m proto.Message) string {
+	if m == nil || !m.ProtoReflect().IsValid() {
+		return "<nil>" // invalid syntax, but okay since this is for debugging
+	}
+	o.allowInvalidUTF8 = true
+	o.AllowPartial = true
+	o.EmitUnknown = true
+	b, _ := o.Marshal(m)
+	return string(b)
+}
+
+// Marshal writes the given proto.Message in textproto format using options in
+// MarshalOptions object. Do not depend on the output being stable. It may
+// change over time across different versions of the program.
+func (o MarshalOptions) Marshal(m proto.Message) ([]byte, error) {
+	var delims = [2]byte{'{', '}'}
+
+	if o.Multiline && o.Indent == "" {
+		o.Indent = defaultIndent
+	}
+	if o.Resolver == nil {
+		o.Resolver = protoregistry.GlobalTypes
+	}
+
+	internalEnc, err := text.NewEncoder(o.Indent, delims, o.EmitASCII)
+	if err != nil {
+		return nil, err
+	}
+
+	// Treat nil message interface as an empty message,
+	// in which case there is nothing to output.
+	if m == nil {
+		return []byte{}, nil
+	}
+
+	enc := encoder{internalEnc, o}
+	err = enc.marshalMessage(m.ProtoReflect(), false)
+	if err != nil {
+		return nil, err
+	}
+	out := enc.Bytes()
+	if len(o.Indent) > 0 && len(out) > 0 {
+		out = append(out, '\n')
+	}
+	if o.AllowPartial {
+		return out, nil
+	}
+	return out, proto.CheckInitialized(m)
+}
+
+type encoder struct {
+	*text.Encoder
+	opts MarshalOptions
+}
+
+// marshalMessage marshals the given protoreflect.Message.
+func (e encoder) marshalMessage(m pref.Message, inclDelims bool) error {
+	messageDesc := m.Descriptor()
+	if !flags.ProtoLegacy && messageset.IsMessageSet(messageDesc) {
+		return errors.New("no support for proto1 MessageSets")
+	}
+
+	if inclDelims {
+		e.StartMessage()
+		defer e.EndMessage()
+	}
+
+	// Handle Any expansion.
+	if messageDesc.FullName() == "google.protobuf.Any" {
+		if e.marshalAny(m) {
+			return nil
+		}
+		// If unable to expand, continue on to marshal Any as a regular message.
+	}
+
+	// Marshal known fields.
+	fieldDescs := messageDesc.Fields()
+	size := fieldDescs.Len()
+	for i := 0; i < size; {
+		fd := fieldDescs.Get(i)
+		if od := fd.ContainingOneof(); od != nil {
+			fd = m.WhichOneof(od)
+			i += od.Fields().Len()
+		} else {
+			i++
+		}
+
+		if fd == nil || !m.Has(fd) {
+			continue
+		}
+
+		name := fd.Name()
+		// Use type name for group field name.
+		if fd.Kind() == pref.GroupKind {
+			name = fd.Message().Name()
+		}
+		val := m.Get(fd)
+		if err := e.marshalField(string(name), val, fd); err != nil {
+			return err
+		}
+	}
+
+	// Marshal extensions.
+	if err := e.marshalExtensions(m); err != nil {
+		return err
+	}
+
+	// Marshal unknown fields.
+	if e.opts.EmitUnknown {
+		e.marshalUnknown(m.GetUnknown())
+	}
+
+	return nil
+}
+
+// marshalField marshals the given field with protoreflect.Value.
+func (e encoder) marshalField(name string, val pref.Value, fd pref.FieldDescriptor) error {
+	switch {
+	case fd.IsList():
+		return e.marshalList(name, val.List(), fd)
+	case fd.IsMap():
+		return e.marshalMap(name, val.Map(), fd)
+	default:
+		e.WriteName(name)
+		return e.marshalSingular(val, fd)
+	}
+}
+
+// marshalSingular marshals the given non-repeated field value. This includes
+// all scalar types, enums, messages, and groups.
+func (e encoder) marshalSingular(val pref.Value, fd pref.FieldDescriptor) error {
+	kind := fd.Kind()
+	switch kind {
+	case pref.BoolKind:
+		e.WriteBool(val.Bool())
+
+	case pref.StringKind:
+		s := val.String()
+		if !e.opts.allowInvalidUTF8 && strs.EnforceUTF8(fd) && !utf8.ValidString(s) {
+			return errors.InvalidUTF8(string(fd.FullName()))
+		}
+		e.WriteString(s)
+
+	case pref.Int32Kind, pref.Int64Kind,
+		pref.Sint32Kind, pref.Sint64Kind,
+		pref.Sfixed32Kind, pref.Sfixed64Kind:
+		e.WriteInt(val.Int())
+
+	case pref.Uint32Kind, pref.Uint64Kind,
+		pref.Fixed32Kind, pref.Fixed64Kind:
+		e.WriteUint(val.Uint())
+
+	case pref.FloatKind:
+		// Encoder.WriteFloat handles the special numbers NaN and infinites.
+		e.WriteFloat(val.Float(), 32)
+
+	case pref.DoubleKind:
+		// Encoder.WriteFloat handles the special numbers NaN and infinites.
+		e.WriteFloat(val.Float(), 64)
+
+	case pref.BytesKind:
+		e.WriteString(string(val.Bytes()))
+
+	case pref.EnumKind:
+		num := val.Enum()
+		if desc := fd.Enum().Values().ByNumber(num); desc != nil {
+			e.WriteLiteral(string(desc.Name()))
+		} else {
+			// Use numeric value if there is no enum description.
+			e.WriteInt(int64(num))
+		}
+
+	case pref.MessageKind, pref.GroupKind:
+		return e.marshalMessage(val.Message(), true)
+
+	default:
+		panic(fmt.Sprintf("%v has unknown kind: %v", fd.FullName(), kind))
+	}
+	return nil
+}
+
+// marshalList marshals the given protoreflect.List as multiple name-value fields.
+func (e encoder) marshalList(name string, list pref.List, fd pref.FieldDescriptor) error {
+	size := list.Len()
+	for i := 0; i < size; i++ {
+		e.WriteName(name)
+		if err := e.marshalSingular(list.Get(i), fd); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// marshalMap marshals the given protoreflect.Map as multiple name-value fields.
+func (e encoder) marshalMap(name string, mmap pref.Map, fd pref.FieldDescriptor) error {
+	var err error
+	mapsort.Range(mmap, fd.MapKey().Kind(), func(key pref.MapKey, val pref.Value) bool {
+		e.WriteName(name)
+		e.StartMessage()
+		defer e.EndMessage()
+
+		e.WriteName("key")
+		err = e.marshalSingular(key.Value(), fd.MapKey())
+		if err != nil {
+			return false
+		}
+
+		e.WriteName("value")
+		err = e.marshalSingular(val, fd.MapValue())
+		if err != nil {
+			return false
+		}
+		return true
+	})
+	return err
+}
+
+// marshalExtensions marshals extension fields.
+func (e encoder) marshalExtensions(m pref.Message) error {
+	type entry struct {
+		key   string
+		value pref.Value
+		desc  pref.FieldDescriptor
+	}
+
+	// Get a sorted list based on field key first.
+	var entries []entry
+	m.Range(func(fd pref.FieldDescriptor, v pref.Value) bool {
+		if !fd.IsExtension() {
+			return true
+		}
+		// For MessageSet extensions, the name used is the parent message.
+		name := fd.FullName()
+		if messageset.IsMessageSetExtension(fd) {
+			name = name.Parent()
+		}
+		entries = append(entries, entry{
+			key:   string(name),
+			value: v,
+			desc:  fd,
+		})
+		return true
+	})
+	// Sort extensions lexicographically.
+	sort.Slice(entries, func(i, j int) bool {
+		return entries[i].key < entries[j].key
+	})
+
+	// Write out sorted list.
+	for _, entry := range entries {
+		// Extension field name is the proto field name enclosed in [].
+		name := "[" + entry.key + "]"
+		if err := e.marshalField(name, entry.value, entry.desc); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// marshalUnknown parses the given []byte and marshals fields out.
+// This function assumes proper encoding in the given []byte.
+func (e encoder) marshalUnknown(b []byte) {
+	const dec = 10
+	const hex = 16
+	for len(b) > 0 {
+		num, wtype, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		e.WriteName(strconv.FormatInt(int64(num), dec))
+
+		switch wtype {
+		case protowire.VarintType:
+			var v uint64
+			v, n = protowire.ConsumeVarint(b)
+			e.WriteUint(v)
+		case protowire.Fixed32Type:
+			var v uint32
+			v, n = protowire.ConsumeFixed32(b)
+			e.WriteLiteral("0x" + strconv.FormatUint(uint64(v), hex))
+		case protowire.Fixed64Type:
+			var v uint64
+			v, n = protowire.ConsumeFixed64(b)
+			e.WriteLiteral("0x" + strconv.FormatUint(v, hex))
+		case protowire.BytesType:
+			var v []byte
+			v, n = protowire.ConsumeBytes(b)
+			e.WriteString(string(v))
+		case protowire.StartGroupType:
+			e.StartMessage()
+			var v []byte
+			v, n = protowire.ConsumeGroup(num, b)
+			e.marshalUnknown(v)
+			e.EndMessage()
+		default:
+			panic(fmt.Sprintf("prototext: error parsing unknown field wire type: %v", wtype))
+		}
+
+		b = b[n:]
+	}
+}
+
+// marshalAny marshals the given google.protobuf.Any message in expanded form.
+// It returns true if it was able to marshal, else false.
+func (e encoder) marshalAny(any pref.Message) bool {
+	// Construct the embedded message.
+	fds := any.Descriptor().Fields()
+	fdType := fds.ByNumber(fieldnum.Any_TypeUrl)
+	typeURL := any.Get(fdType).String()
+	mt, err := e.opts.Resolver.FindMessageByURL(typeURL)
+	if err != nil {
+		return false
+	}
+	m := mt.New().Interface()
+
+	// Unmarshal bytes into embedded message.
+	fdValue := fds.ByNumber(fieldnum.Any_Value)
+	value := any.Get(fdValue)
+	err = proto.UnmarshalOptions{
+		AllowPartial: true,
+		Resolver:     e.opts.Resolver,
+	}.Unmarshal(value.Bytes(), m)
+	if err != nil {
+		return false
+	}
+
+	// Get current encoder position. If marshaling fails, reset encoder output
+	// back to this position.
+	pos := e.Snapshot()
+
+	// Field name is the proto field name enclosed in [].
+	e.WriteName("[" + typeURL + "]")
+	err = e.marshalMessage(m.ProtoReflect(), true)
+	if err != nil {
+		e.Reset(pos)
+		return false
+	}
+	return true
+}
diff --git a/vendor/google.golang.org/protobuf/encoding/protowire/wire.go b/vendor/google.golang.org/protobuf/encoding/protowire/wire.go
new file mode 100644
index 0000000..a427f8b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/protowire/wire.go
@@ -0,0 +1,538 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protowire parses and formats the raw wire encoding.
+// See https://developers.google.com/protocol-buffers/docs/encoding.
+//
+// For marshaling and unmarshaling entire protobuf messages,
+// use the "google.golang.org/protobuf/proto" package instead.
+package protowire
+
+import (
+	"io"
+	"math"
+	"math/bits"
+
+	"google.golang.org/protobuf/internal/errors"
+)
+
+// Number represents the field number.
+type Number int32
+
+const (
+	MinValidNumber      Number = 1
+	FirstReservedNumber Number = 19000
+	LastReservedNumber  Number = 19999
+	MaxValidNumber      Number = 1<<29 - 1
+)
+
+// IsValid reports whether the field number is semantically valid.
+//
+// Note that while numbers within the reserved range are semantically invalid,
+// they are syntactically valid in the wire format.
+// Implementations may treat records with reserved field numbers as unknown.
+func (n Number) IsValid() bool {
+	return MinValidNumber <= n && n < FirstReservedNumber || LastReservedNumber < n && n <= MaxValidNumber
+}
+
+// Type represents the wire type.
+type Type int8
+
+const (
+	VarintType     Type = 0
+	Fixed32Type    Type = 5
+	Fixed64Type    Type = 1
+	BytesType      Type = 2
+	StartGroupType Type = 3
+	EndGroupType   Type = 4
+)
+
+const (
+	_ = -iota
+	errCodeTruncated
+	errCodeFieldNumber
+	errCodeOverflow
+	errCodeReserved
+	errCodeEndGroup
+)
+
+var (
+	errFieldNumber = errors.New("invalid field number")
+	errOverflow    = errors.New("variable length integer overflow")
+	errReserved    = errors.New("cannot parse reserved wire type")
+	errEndGroup    = errors.New("mismatching end group marker")
+	errParse       = errors.New("parse error")
+)
+
+// ParseError converts an error code into an error value.
+// This returns nil if n is a non-negative number.
+func ParseError(n int) error {
+	if n >= 0 {
+		return nil
+	}
+	switch n {
+	case errCodeTruncated:
+		return io.ErrUnexpectedEOF
+	case errCodeFieldNumber:
+		return errFieldNumber
+	case errCodeOverflow:
+		return errOverflow
+	case errCodeReserved:
+		return errReserved
+	case errCodeEndGroup:
+		return errEndGroup
+	default:
+		return errParse
+	}
+}
+
+// ConsumeField parses an entire field record (both tag and value) and returns
+// the field number, the wire type, and the total length.
+// This returns a negative length upon an error (see ParseError).
+//
+// The total length includes the tag header and the end group marker (if the
+// field is a group).
+func ConsumeField(b []byte) (Number, Type, int) {
+	num, typ, n := ConsumeTag(b)
+	if n < 0 {
+		return 0, 0, n // forward error code
+	}
+	m := ConsumeFieldValue(num, typ, b[n:])
+	if m < 0 {
+		return 0, 0, m // forward error code
+	}
+	return num, typ, n + m
+}
+
+// ConsumeFieldValue parses a field value and returns its length.
+// This assumes that the field Number and wire Type have already been parsed.
+// This returns a negative length upon an error (see ParseError).
+//
+// When parsing a group, the length includes the end group marker and
+// the end group is verified to match the starting field number.
+func ConsumeFieldValue(num Number, typ Type, b []byte) (n int) {
+	switch typ {
+	case VarintType:
+		_, n = ConsumeVarint(b)
+		return n
+	case Fixed32Type:
+		_, n = ConsumeFixed32(b)
+		return n
+	case Fixed64Type:
+		_, n = ConsumeFixed64(b)
+		return n
+	case BytesType:
+		_, n = ConsumeBytes(b)
+		return n
+	case StartGroupType:
+		n0 := len(b)
+		for {
+			num2, typ2, n := ConsumeTag(b)
+			if n < 0 {
+				return n // forward error code
+			}
+			b = b[n:]
+			if typ2 == EndGroupType {
+				if num != num2 {
+					return errCodeEndGroup
+				}
+				return n0 - len(b)
+			}
+
+			n = ConsumeFieldValue(num2, typ2, b)
+			if n < 0 {
+				return n // forward error code
+			}
+			b = b[n:]
+		}
+	case EndGroupType:
+		return errCodeEndGroup
+	default:
+		return errCodeReserved
+	}
+}
+
+// AppendTag encodes num and typ as a varint-encoded tag and appends it to b.
+func AppendTag(b []byte, num Number, typ Type) []byte {
+	return AppendVarint(b, EncodeTag(num, typ))
+}
+
+// ConsumeTag parses b as a varint-encoded tag, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeTag(b []byte) (Number, Type, int) {
+	v, n := ConsumeVarint(b)
+	if n < 0 {
+		return 0, 0, n // forward error code
+	}
+	num, typ := DecodeTag(v)
+	if num < MinValidNumber {
+		return 0, 0, errCodeFieldNumber
+	}
+	return num, typ, n
+}
+
+func SizeTag(num Number) int {
+	return SizeVarint(EncodeTag(num, 0)) // wire type has no effect on size
+}
+
+// AppendVarint appends v to b as a varint-encoded uint64.
+func AppendVarint(b []byte, v uint64) []byte {
+	switch {
+	case v < 1<<7:
+		b = append(b, byte(v))
+	case v < 1<<14:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte(v>>7))
+	case v < 1<<21:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte(v>>14))
+	case v < 1<<28:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte(v>>21))
+	case v < 1<<35:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte(v>>28))
+	case v < 1<<42:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte((v>>28)&0x7f|0x80),
+			byte(v>>35))
+	case v < 1<<49:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte((v>>28)&0x7f|0x80),
+			byte((v>>35)&0x7f|0x80),
+			byte(v>>42))
+	case v < 1<<56:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte((v>>28)&0x7f|0x80),
+			byte((v>>35)&0x7f|0x80),
+			byte((v>>42)&0x7f|0x80),
+			byte(v>>49))
+	case v < 1<<63:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte((v>>28)&0x7f|0x80),
+			byte((v>>35)&0x7f|0x80),
+			byte((v>>42)&0x7f|0x80),
+			byte((v>>49)&0x7f|0x80),
+			byte(v>>56))
+	default:
+		b = append(b,
+			byte((v>>0)&0x7f|0x80),
+			byte((v>>7)&0x7f|0x80),
+			byte((v>>14)&0x7f|0x80),
+			byte((v>>21)&0x7f|0x80),
+			byte((v>>28)&0x7f|0x80),
+			byte((v>>35)&0x7f|0x80),
+			byte((v>>42)&0x7f|0x80),
+			byte((v>>49)&0x7f|0x80),
+			byte((v>>56)&0x7f|0x80),
+			1)
+	}
+	return b
+}
+
+// ConsumeVarint parses b as a varint-encoded uint64, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeVarint(b []byte) (v uint64, n int) {
+	var y uint64
+	if len(b) <= 0 {
+		return 0, errCodeTruncated
+	}
+	v = uint64(b[0])
+	if v < 0x80 {
+		return v, 1
+	}
+	v -= 0x80
+
+	if len(b) <= 1 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[1])
+	v += y << 7
+	if y < 0x80 {
+		return v, 2
+	}
+	v -= 0x80 << 7
+
+	if len(b) <= 2 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[2])
+	v += y << 14
+	if y < 0x80 {
+		return v, 3
+	}
+	v -= 0x80 << 14
+
+	if len(b) <= 3 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[3])
+	v += y << 21
+	if y < 0x80 {
+		return v, 4
+	}
+	v -= 0x80 << 21
+
+	if len(b) <= 4 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[4])
+	v += y << 28
+	if y < 0x80 {
+		return v, 5
+	}
+	v -= 0x80 << 28
+
+	if len(b) <= 5 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[5])
+	v += y << 35
+	if y < 0x80 {
+		return v, 6
+	}
+	v -= 0x80 << 35
+
+	if len(b) <= 6 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[6])
+	v += y << 42
+	if y < 0x80 {
+		return v, 7
+	}
+	v -= 0x80 << 42
+
+	if len(b) <= 7 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[7])
+	v += y << 49
+	if y < 0x80 {
+		return v, 8
+	}
+	v -= 0x80 << 49
+
+	if len(b) <= 8 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[8])
+	v += y << 56
+	if y < 0x80 {
+		return v, 9
+	}
+	v -= 0x80 << 56
+
+	if len(b) <= 9 {
+		return 0, errCodeTruncated
+	}
+	y = uint64(b[9])
+	v += y << 63
+	if y < 2 {
+		return v, 10
+	}
+	return 0, errCodeOverflow
+}
+
+// SizeVarint returns the encoded size of a varint.
+// The size is guaranteed to be within 1 and 10, inclusive.
+func SizeVarint(v uint64) int {
+	// This computes 1 + (bits.Len64(v)-1)/7.
+	// 9/64 is a good enough approximation of 1/7
+	return int(9*uint32(bits.Len64(v))+64) / 64
+}
+
+// AppendFixed32 appends v to b as a little-endian uint32.
+func AppendFixed32(b []byte, v uint32) []byte {
+	return append(b,
+		byte(v>>0),
+		byte(v>>8),
+		byte(v>>16),
+		byte(v>>24))
+}
+
+// ConsumeFixed32 parses b as a little-endian uint32, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeFixed32(b []byte) (v uint32, n int) {
+	if len(b) < 4 {
+		return 0, errCodeTruncated
+	}
+	v = uint32(b[0])<<0 | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+	return v, 4
+}
+
+// SizeFixed32 returns the encoded size of a fixed32; which is always 4.
+func SizeFixed32() int {
+	return 4
+}
+
+// AppendFixed64 appends v to b as a little-endian uint64.
+func AppendFixed64(b []byte, v uint64) []byte {
+	return append(b,
+		byte(v>>0),
+		byte(v>>8),
+		byte(v>>16),
+		byte(v>>24),
+		byte(v>>32),
+		byte(v>>40),
+		byte(v>>48),
+		byte(v>>56))
+}
+
+// ConsumeFixed64 parses b as a little-endian uint64, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeFixed64(b []byte) (v uint64, n int) {
+	if len(b) < 8 {
+		return 0, errCodeTruncated
+	}
+	v = uint64(b[0])<<0 | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+	return v, 8
+}
+
+// SizeFixed64 returns the encoded size of a fixed64; which is always 8.
+func SizeFixed64() int {
+	return 8
+}
+
+// AppendBytes appends v to b as a length-prefixed bytes value.
+func AppendBytes(b []byte, v []byte) []byte {
+	return append(AppendVarint(b, uint64(len(v))), v...)
+}
+
+// ConsumeBytes parses b as a length-prefixed bytes value, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeBytes(b []byte) (v []byte, n int) {
+	m, n := ConsumeVarint(b)
+	if n < 0 {
+		return nil, n // forward error code
+	}
+	if m > uint64(len(b[n:])) {
+		return nil, errCodeTruncated
+	}
+	return b[n:][:m], n + int(m)
+}
+
+// SizeBytes returns the encoded size of a length-prefixed bytes value,
+// given only the length.
+func SizeBytes(n int) int {
+	return SizeVarint(uint64(n)) + n
+}
+
+// AppendString appends v to b as a length-prefixed bytes value.
+func AppendString(b []byte, v string) []byte {
+	return append(AppendVarint(b, uint64(len(v))), v...)
+}
+
+// ConsumeString parses b as a length-prefixed bytes value, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeString(b []byte) (v string, n int) {
+	bb, n := ConsumeBytes(b)
+	return string(bb), n
+}
+
+// AppendGroup appends v to b as group value, with a trailing end group marker.
+// The value v must not contain the end marker.
+func AppendGroup(b []byte, num Number, v []byte) []byte {
+	return AppendVarint(append(b, v...), EncodeTag(num, EndGroupType))
+}
+
+// ConsumeGroup parses b as a group value until the trailing end group marker,
+// and verifies that the end marker matches the provided num. The value v
+// does not contain the end marker, while the length does contain the end marker.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeGroup(num Number, b []byte) (v []byte, n int) {
+	n = ConsumeFieldValue(num, StartGroupType, b)
+	if n < 0 {
+		return nil, n // forward error code
+	}
+	b = b[:n]
+
+	// Truncate off end group marker, but need to handle denormalized varints.
+	// Assuming end marker is never 0 (which is always the case since
+	// EndGroupType is non-zero), we can truncate all trailing bytes where the
+	// lower 7 bits are all zero (implying that the varint is denormalized).
+	for len(b) > 0 && b[len(b)-1]&0x7f == 0 {
+		b = b[:len(b)-1]
+	}
+	b = b[:len(b)-SizeTag(num)]
+	return b, n
+}
+
+// SizeGroup returns the encoded size of a group, given only the length.
+func SizeGroup(num Number, n int) int {
+	return n + SizeTag(num)
+}
+
+// DecodeTag decodes the field Number and wire Type from its unified form.
+// The Number is -1 if the decoded field number overflows int32.
+// Other than overflow, this does not check for field number validity.
+func DecodeTag(x uint64) (Number, Type) {
+	// NOTE: MessageSet allows for larger field numbers than normal.
+	if x>>3 > uint64(math.MaxInt32) {
+		return -1, 0
+	}
+	return Number(x >> 3), Type(x & 7)
+}
+
+// EncodeTag encodes the field Number and wire Type into its unified form.
+func EncodeTag(num Number, typ Type) uint64 {
+	return uint64(num)<<3 | uint64(typ&7)
+}
+
+// DecodeZigZag decodes a zig-zag-encoded uint64 as an int64.
+//	Input:  {…,  5,  3,  1,  0,  2,  4,  6, …}
+//	Output: {…, -3, -2, -1,  0, +1, +2, +3, …}
+func DecodeZigZag(x uint64) int64 {
+	return int64(x>>1) ^ int64(x)<<63>>63
+}
+
+// EncodeZigZag encodes an int64 as a zig-zag-encoded uint64.
+//	Input:  {…, -3, -2, -1,  0, +1, +2, +3, …}
+//	Output: {…,  5,  3,  1,  0,  2,  4,  6, …}
+func EncodeZigZag(x int64) uint64 {
+	return uint64(x<<1) ^ uint64(x>>63)
+}
+
+// DecodeBool decodes a uint64 as a bool.
+//	Input:  {    0,    1,    2, …}
+//	Output: {false, true, true, …}
+func DecodeBool(x uint64) bool {
+	return x != 0
+}
+
+// EncodeBool encodes a bool as a uint64.
+//	Input:  {false, true}
+//	Output: {    0,    1}
+func EncodeBool(x bool) uint64 {
+	if x {
+		return 1
+	}
+	return 0
+}
diff --git a/vendor/google.golang.org/protobuf/internal/descfmt/stringer.go b/vendor/google.golang.org/protobuf/internal/descfmt/stringer.go
new file mode 100644
index 0000000..e7af0fe
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/descfmt/stringer.go
@@ -0,0 +1,316 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package descfmt provides functionality to format descriptors.
+package descfmt
+
+import (
+	"fmt"
+	"io"
+	"reflect"
+	"strconv"
+	"strings"
+
+	"google.golang.org/protobuf/internal/detrand"
+	"google.golang.org/protobuf/internal/pragma"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type list interface {
+	Len() int
+	pragma.DoNotImplement
+}
+
+func FormatList(s fmt.State, r rune, vs list) {
+	io.WriteString(s, formatListOpt(vs, true, r == 'v' && (s.Flag('+') || s.Flag('#'))))
+}
+func formatListOpt(vs list, isRoot, allowMulti bool) string {
+	start, end := "[", "]"
+	if isRoot {
+		var name string
+		switch vs.(type) {
+		case pref.Names:
+			name = "Names"
+		case pref.FieldNumbers:
+			name = "FieldNumbers"
+		case pref.FieldRanges:
+			name = "FieldRanges"
+		case pref.EnumRanges:
+			name = "EnumRanges"
+		case pref.FileImports:
+			name = "FileImports"
+		case pref.Descriptor:
+			name = reflect.ValueOf(vs).MethodByName("Get").Type().Out(0).Name() + "s"
+		}
+		start, end = name+"{", "}"
+	}
+
+	var ss []string
+	switch vs := vs.(type) {
+	case pref.Names:
+		for i := 0; i < vs.Len(); i++ {
+			ss = append(ss, fmt.Sprint(vs.Get(i)))
+		}
+		return start + joinStrings(ss, false) + end
+	case pref.FieldNumbers:
+		for i := 0; i < vs.Len(); i++ {
+			ss = append(ss, fmt.Sprint(vs.Get(i)))
+		}
+		return start + joinStrings(ss, false) + end
+	case pref.FieldRanges:
+		for i := 0; i < vs.Len(); i++ {
+			r := vs.Get(i)
+			if r[0]+1 == r[1] {
+				ss = append(ss, fmt.Sprintf("%d", r[0]))
+			} else {
+				ss = append(ss, fmt.Sprintf("%d:%d", r[0], r[1])) // enum ranges are end exclusive
+			}
+		}
+		return start + joinStrings(ss, false) + end
+	case pref.EnumRanges:
+		for i := 0; i < vs.Len(); i++ {
+			r := vs.Get(i)
+			if r[0] == r[1] {
+				ss = append(ss, fmt.Sprintf("%d", r[0]))
+			} else {
+				ss = append(ss, fmt.Sprintf("%d:%d", r[0], int64(r[1])+1)) // enum ranges are end inclusive
+			}
+		}
+		return start + joinStrings(ss, false) + end
+	case pref.FileImports:
+		for i := 0; i < vs.Len(); i++ {
+			var rs records
+			rs.Append(reflect.ValueOf(vs.Get(i)), "Path", "Package", "IsPublic", "IsWeak")
+			ss = append(ss, "{"+rs.Join()+"}")
+		}
+		return start + joinStrings(ss, allowMulti) + end
+	default:
+		_, isEnumValue := vs.(pref.EnumValueDescriptors)
+		for i := 0; i < vs.Len(); i++ {
+			m := reflect.ValueOf(vs).MethodByName("Get")
+			v := m.Call([]reflect.Value{reflect.ValueOf(i)})[0].Interface()
+			ss = append(ss, formatDescOpt(v.(pref.Descriptor), false, allowMulti && !isEnumValue))
+		}
+		return start + joinStrings(ss, allowMulti && isEnumValue) + end
+	}
+}
+
+// descriptorAccessors is a list of accessors to print for each descriptor.
+//
+// Do not print all accessors since some contain redundant information,
+// while others are pointers that we do not want to follow since the descriptor
+// is actually a cyclic graph.
+//
+// Using a list allows us to print the accessors in a sensible order.
+var descriptorAccessors = map[reflect.Type][]string{
+	reflect.TypeOf((*pref.FileDescriptor)(nil)).Elem():      {"Path", "Package", "Imports", "Messages", "Enums", "Extensions", "Services"},
+	reflect.TypeOf((*pref.MessageDescriptor)(nil)).Elem():   {"IsMapEntry", "Fields", "Oneofs", "ReservedNames", "ReservedRanges", "RequiredNumbers", "ExtensionRanges", "Messages", "Enums", "Extensions"},
+	reflect.TypeOf((*pref.FieldDescriptor)(nil)).Elem():     {"Number", "Cardinality", "Kind", "HasJSONName", "JSONName", "HasPresence", "IsExtension", "IsPacked", "IsWeak", "IsList", "IsMap", "MapKey", "MapValue", "HasDefault", "Default", "ContainingOneof", "ContainingMessage", "Message", "Enum"},
+	reflect.TypeOf((*pref.OneofDescriptor)(nil)).Elem():     {"Fields"}, // not directly used; must keep in sync with formatDescOpt
+	reflect.TypeOf((*pref.EnumDescriptor)(nil)).Elem():      {"Values", "ReservedNames", "ReservedRanges"},
+	reflect.TypeOf((*pref.EnumValueDescriptor)(nil)).Elem(): {"Number"},
+	reflect.TypeOf((*pref.ServiceDescriptor)(nil)).Elem():   {"Methods"},
+	reflect.TypeOf((*pref.MethodDescriptor)(nil)).Elem():    {"Input", "Output", "IsStreamingClient", "IsStreamingServer"},
+}
+
+func FormatDesc(s fmt.State, r rune, t pref.Descriptor) {
+	io.WriteString(s, formatDescOpt(t, true, r == 'v' && (s.Flag('+') || s.Flag('#'))))
+}
+func formatDescOpt(t pref.Descriptor, isRoot, allowMulti bool) string {
+	rv := reflect.ValueOf(t)
+	rt := rv.MethodByName("ProtoType").Type().In(0)
+
+	start, end := "{", "}"
+	if isRoot {
+		start = rt.Name() + "{"
+	}
+
+	_, isFile := t.(pref.FileDescriptor)
+	rs := records{allowMulti: allowMulti}
+	if t.IsPlaceholder() {
+		if isFile {
+			rs.Append(rv, "Path", "Package", "IsPlaceholder")
+		} else {
+			rs.Append(rv, "FullName", "IsPlaceholder")
+		}
+	} else {
+		switch {
+		case isFile:
+			rs.Append(rv, "Syntax")
+		case isRoot:
+			rs.Append(rv, "Syntax", "FullName")
+		default:
+			rs.Append(rv, "Name")
+		}
+		switch t := t.(type) {
+		case pref.FieldDescriptor:
+			for _, s := range descriptorAccessors[rt] {
+				switch s {
+				case "MapKey":
+					if k := t.MapKey(); k != nil {
+						rs.recs = append(rs.recs, [2]string{"MapKey", k.Kind().String()})
+					}
+				case "MapValue":
+					if v := t.MapValue(); v != nil {
+						switch v.Kind() {
+						case pref.EnumKind:
+							rs.recs = append(rs.recs, [2]string{"MapValue", string(v.Enum().FullName())})
+						case pref.MessageKind, pref.GroupKind:
+							rs.recs = append(rs.recs, [2]string{"MapValue", string(v.Message().FullName())})
+						default:
+							rs.recs = append(rs.recs, [2]string{"MapValue", v.Kind().String()})
+						}
+					}
+				case "ContainingOneof":
+					if od := t.ContainingOneof(); od != nil {
+						rs.recs = append(rs.recs, [2]string{"Oneof", string(od.Name())})
+					}
+				case "ContainingMessage":
+					if t.IsExtension() {
+						rs.recs = append(rs.recs, [2]string{"Extendee", string(t.ContainingMessage().FullName())})
+					}
+				case "Message":
+					if !t.IsMap() {
+						rs.Append(rv, s)
+					}
+				default:
+					rs.Append(rv, s)
+				}
+			}
+		case pref.OneofDescriptor:
+			var ss []string
+			fs := t.Fields()
+			for i := 0; i < fs.Len(); i++ {
+				ss = append(ss, string(fs.Get(i).Name()))
+			}
+			if len(ss) > 0 {
+				rs.recs = append(rs.recs, [2]string{"Fields", "[" + joinStrings(ss, false) + "]"})
+			}
+		default:
+			rs.Append(rv, descriptorAccessors[rt]...)
+		}
+		if rv.MethodByName("GoType").IsValid() {
+			rs.Append(rv, "GoType")
+		}
+	}
+	return start + rs.Join() + end
+}
+
+type records struct {
+	recs       [][2]string
+	allowMulti bool
+}
+
+func (rs *records) Append(v reflect.Value, accessors ...string) {
+	for _, a := range accessors {
+		var rv reflect.Value
+		if m := v.MethodByName(a); m.IsValid() {
+			rv = m.Call(nil)[0]
+		}
+		if v.Kind() == reflect.Struct && !rv.IsValid() {
+			rv = v.FieldByName(a)
+		}
+		if !rv.IsValid() {
+			panic(fmt.Sprintf("unknown accessor: %v.%s", v.Type(), a))
+		}
+		if _, ok := rv.Interface().(pref.Value); ok {
+			rv = rv.MethodByName("Interface").Call(nil)[0]
+			if !rv.IsNil() {
+				rv = rv.Elem()
+			}
+		}
+
+		// Ignore zero values.
+		var isZero bool
+		switch rv.Kind() {
+		case reflect.Interface, reflect.Slice:
+			isZero = rv.IsNil()
+		case reflect.Bool:
+			isZero = rv.Bool() == false
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			isZero = rv.Int() == 0
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			isZero = rv.Uint() == 0
+		case reflect.String:
+			isZero = rv.String() == ""
+		}
+		if n, ok := rv.Interface().(list); ok {
+			isZero = n.Len() == 0
+		}
+		if isZero {
+			continue
+		}
+
+		// Format the value.
+		var s string
+		v := rv.Interface()
+		switch v := v.(type) {
+		case list:
+			s = formatListOpt(v, false, rs.allowMulti)
+		case pref.FieldDescriptor, pref.OneofDescriptor, pref.EnumValueDescriptor, pref.MethodDescriptor:
+			s = string(v.(pref.Descriptor).Name())
+		case pref.Descriptor:
+			s = string(v.FullName())
+		case string:
+			s = strconv.Quote(v)
+		case []byte:
+			s = fmt.Sprintf("%q", v)
+		default:
+			s = fmt.Sprint(v)
+		}
+		rs.recs = append(rs.recs, [2]string{a, s})
+	}
+}
+
+func (rs *records) Join() string {
+	var ss []string
+
+	// In single line mode, simply join all records with commas.
+	if !rs.allowMulti {
+		for _, r := range rs.recs {
+			ss = append(ss, r[0]+formatColon(0)+r[1])
+		}
+		return joinStrings(ss, false)
+	}
+
+	// In allowMulti line mode, align single line records for more readable output.
+	var maxLen int
+	flush := func(i int) {
+		for _, r := range rs.recs[len(ss):i] {
+			ss = append(ss, r[0]+formatColon(maxLen-len(r[0]))+r[1])
+		}
+		maxLen = 0
+	}
+	for i, r := range rs.recs {
+		if isMulti := strings.Contains(r[1], "\n"); isMulti {
+			flush(i)
+			ss = append(ss, r[0]+formatColon(0)+strings.Join(strings.Split(r[1], "\n"), "\n\t"))
+		} else if maxLen < len(r[0]) {
+			maxLen = len(r[0])
+		}
+	}
+	flush(len(rs.recs))
+	return joinStrings(ss, true)
+}
+
+func formatColon(padding int) string {
+	// Deliberately introduce instability into the debug output to
+	// discourage users from performing string comparisons.
+	// This provides us flexibility to change the output in the future.
+	if detrand.Bool() {
+		return ":" + strings.Repeat(" ", 1+padding) // use non-breaking spaces (U+00a0)
+	} else {
+		return ":" + strings.Repeat(" ", 1+padding) // use regular spaces (U+0020)
+	}
+}
+
+func joinStrings(ss []string, isMulti bool) string {
+	if len(ss) == 0 {
+		return ""
+	}
+	if isMulti {
+		return "\n\t" + strings.Join(ss, "\n\t") + "\n"
+	}
+	return strings.Join(ss, ", ")
+}
diff --git a/vendor/google.golang.org/protobuf/internal/descopts/options.go b/vendor/google.golang.org/protobuf/internal/descopts/options.go
new file mode 100644
index 0000000..8401be8
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/descopts/options.go
@@ -0,0 +1,29 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package descopts contains the nil pointers to concrete descriptor options.
+//
+// This package exists as a form of reverse dependency injection so that certain
+// packages (e.g., internal/filedesc and internal/filetype can avoid a direct
+// dependency on the descriptor proto package).
+package descopts
+
+import pref "google.golang.org/protobuf/reflect/protoreflect"
+
+// These variables are set by the init function in descriptor.pb.go via logic
+// in internal/filetype. In other words, so long as the descriptor proto package
+// is linked in, these variables will be populated.
+//
+// Each variable is populated with a nil pointer to the options struct.
+var (
+	File           pref.ProtoMessage
+	Enum           pref.ProtoMessage
+	EnumValue      pref.ProtoMessage
+	Message        pref.ProtoMessage
+	Field          pref.ProtoMessage
+	Oneof          pref.ProtoMessage
+	ExtensionRange pref.ProtoMessage
+	Service        pref.ProtoMessage
+	Method         pref.ProtoMessage
+)
diff --git a/vendor/google.golang.org/protobuf/internal/detrand/rand.go b/vendor/google.golang.org/protobuf/internal/detrand/rand.go
new file mode 100644
index 0000000..a904dd1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/detrand/rand.go
@@ -0,0 +1,61 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package detrand provides deterministically random functionality.
+//
+// The pseudo-randomness of these functions is seeded by the program binary
+// itself and guarantees that the output does not change within a program,
+// while ensuring that the output is unstable across different builds.
+package detrand
+
+import (
+	"encoding/binary"
+	"hash/fnv"
+	"os"
+)
+
+// Disable disables detrand such that all functions returns the zero value.
+// This function is not concurrent-safe and must be called during program init.
+func Disable() {
+	randSeed = 0
+}
+
+// Bool returns a deterministically random boolean.
+func Bool() bool {
+	return randSeed%2 == 1
+}
+
+// randSeed is a best-effort at an approximate hash of the Go binary.
+var randSeed = binaryHash()
+
+func binaryHash() uint64 {
+	// Open the Go binary.
+	s, err := os.Executable()
+	if err != nil {
+		return 0
+	}
+	f, err := os.Open(s)
+	if err != nil {
+		return 0
+	}
+	defer f.Close()
+
+	// Hash the size and several samples of the Go binary.
+	const numSamples = 8
+	var buf [64]byte
+	h := fnv.New64()
+	fi, err := f.Stat()
+	if err != nil {
+		return 0
+	}
+	binary.LittleEndian.PutUint64(buf[:8], uint64(fi.Size()))
+	h.Write(buf[:8])
+	for i := int64(0); i < numSamples; i++ {
+		if _, err := f.ReadAt(buf[:], i*fi.Size()/numSamples); err != nil {
+			return 0
+		}
+		h.Write(buf[:])
+	}
+	return h.Sum64()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/defval/default.go b/vendor/google.golang.org/protobuf/internal/encoding/defval/default.go
new file mode 100644
index 0000000..fdd9b13
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/defval/default.go
@@ -0,0 +1,213 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package defval marshals and unmarshals textual forms of default values.
+//
+// This package handles both the form historically used in Go struct field tags
+// and also the form used by google.protobuf.FieldDescriptorProto.default_value
+// since they differ in superficial ways.
+package defval
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+
+	ptext "google.golang.org/protobuf/internal/encoding/text"
+	errors "google.golang.org/protobuf/internal/errors"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Format is the serialization format used to represent the default value.
+type Format int
+
+const (
+	_ Format = iota
+
+	// Descriptor uses the serialization format that protoc uses with the
+	// google.protobuf.FieldDescriptorProto.default_value field.
+	Descriptor
+
+	// GoTag uses the historical serialization format in Go struct field tags.
+	GoTag
+)
+
+// Unmarshal deserializes the default string s according to the given kind k.
+// When k is an enum, a list of enum value descriptors must be provided.
+func Unmarshal(s string, k pref.Kind, evs pref.EnumValueDescriptors, f Format) (pref.Value, pref.EnumValueDescriptor, error) {
+	switch k {
+	case pref.BoolKind:
+		if f == GoTag {
+			switch s {
+			case "1":
+				return pref.ValueOfBool(true), nil, nil
+			case "0":
+				return pref.ValueOfBool(false), nil, nil
+			}
+		} else {
+			switch s {
+			case "true":
+				return pref.ValueOfBool(true), nil, nil
+			case "false":
+				return pref.ValueOfBool(false), nil, nil
+			}
+		}
+	case pref.EnumKind:
+		if f == GoTag {
+			// Go tags use the numeric form of the enum value.
+			if n, err := strconv.ParseInt(s, 10, 32); err == nil {
+				if ev := evs.ByNumber(pref.EnumNumber(n)); ev != nil {
+					return pref.ValueOfEnum(ev.Number()), ev, nil
+				}
+			}
+		} else {
+			// Descriptor default_value use the enum identifier.
+			ev := evs.ByName(pref.Name(s))
+			if ev != nil {
+				return pref.ValueOfEnum(ev.Number()), ev, nil
+			}
+		}
+	case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
+		if v, err := strconv.ParseInt(s, 10, 32); err == nil {
+			return pref.ValueOfInt32(int32(v)), nil, nil
+		}
+	case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
+			return pref.ValueOfInt64(int64(v)), nil, nil
+		}
+	case pref.Uint32Kind, pref.Fixed32Kind:
+		if v, err := strconv.ParseUint(s, 10, 32); err == nil {
+			return pref.ValueOfUint32(uint32(v)), nil, nil
+		}
+	case pref.Uint64Kind, pref.Fixed64Kind:
+		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
+			return pref.ValueOfUint64(uint64(v)), nil, nil
+		}
+	case pref.FloatKind, pref.DoubleKind:
+		var v float64
+		var err error
+		switch s {
+		case "-inf":
+			v = math.Inf(-1)
+		case "inf":
+			v = math.Inf(+1)
+		case "nan":
+			v = math.NaN()
+		default:
+			v, err = strconv.ParseFloat(s, 64)
+		}
+		if err == nil {
+			if k == pref.FloatKind {
+				return pref.ValueOfFloat32(float32(v)), nil, nil
+			} else {
+				return pref.ValueOfFloat64(float64(v)), nil, nil
+			}
+		}
+	case pref.StringKind:
+		// String values are already unescaped and can be used as is.
+		return pref.ValueOfString(s), nil, nil
+	case pref.BytesKind:
+		if b, ok := unmarshalBytes(s); ok {
+			return pref.ValueOfBytes(b), nil, nil
+		}
+	}
+	return pref.Value{}, nil, errors.New("could not parse value for %v: %q", k, s)
+}
+
+// Marshal serializes v as the default string according to the given kind k.
+// When specifying the Descriptor format for an enum kind, the associated
+// enum value descriptor must be provided.
+func Marshal(v pref.Value, ev pref.EnumValueDescriptor, k pref.Kind, f Format) (string, error) {
+	switch k {
+	case pref.BoolKind:
+		if f == GoTag {
+			if v.Bool() {
+				return "1", nil
+			} else {
+				return "0", nil
+			}
+		} else {
+			if v.Bool() {
+				return "true", nil
+			} else {
+				return "false", nil
+			}
+		}
+	case pref.EnumKind:
+		if f == GoTag {
+			return strconv.FormatInt(int64(v.Enum()), 10), nil
+		} else {
+			return string(ev.Name()), nil
+		}
+	case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind, pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+		return strconv.FormatInt(v.Int(), 10), nil
+	case pref.Uint32Kind, pref.Fixed32Kind, pref.Uint64Kind, pref.Fixed64Kind:
+		return strconv.FormatUint(v.Uint(), 10), nil
+	case pref.FloatKind, pref.DoubleKind:
+		f := v.Float()
+		switch {
+		case math.IsInf(f, -1):
+			return "-inf", nil
+		case math.IsInf(f, +1):
+			return "inf", nil
+		case math.IsNaN(f):
+			return "nan", nil
+		default:
+			if k == pref.FloatKind {
+				return strconv.FormatFloat(f, 'g', -1, 32), nil
+			} else {
+				return strconv.FormatFloat(f, 'g', -1, 64), nil
+			}
+		}
+	case pref.StringKind:
+		// String values are serialized as is without any escaping.
+		return v.String(), nil
+	case pref.BytesKind:
+		if s, ok := marshalBytes(v.Bytes()); ok {
+			return s, nil
+		}
+	}
+	return "", errors.New("could not format value for %v: %v", k, v)
+}
+
+// unmarshalBytes deserializes bytes by applying C unescaping.
+func unmarshalBytes(s string) ([]byte, bool) {
+	// Bytes values use the same escaping as the text format,
+	// however they lack the surrounding double quotes.
+	v, err := ptext.UnmarshalString(`"` + s + `"`)
+	if err != nil {
+		return nil, false
+	}
+	return []byte(v), true
+}
+
+// marshalBytes serializes bytes by using C escaping.
+// To match the exact output of protoc, this is identical to the
+// CEscape function in strutil.cc of the protoc source code.
+func marshalBytes(b []byte) (string, bool) {
+	var s []byte
+	for _, c := range b {
+		switch c {
+		case '\n':
+			s = append(s, `\n`...)
+		case '\r':
+			s = append(s, `\r`...)
+		case '\t':
+			s = append(s, `\t`...)
+		case '"':
+			s = append(s, `\"`...)
+		case '\'':
+			s = append(s, `\'`...)
+		case '\\':
+			s = append(s, `\\`...)
+		default:
+			if printableASCII := c >= 0x20 && c <= 0x7e; printableASCII {
+				s = append(s, c)
+			} else {
+				s = append(s, fmt.Sprintf(`\%03o`, c)...)
+			}
+		}
+	}
+	return string(s), true
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/messageset/messageset.go b/vendor/google.golang.org/protobuf/internal/encoding/messageset/messageset.go
new file mode 100644
index 0000000..b1eeea5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/messageset/messageset.go
@@ -0,0 +1,258 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package messageset encodes and decodes the obsolete MessageSet wire format.
+package messageset
+
+import (
+	"math"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// The MessageSet wire format is equivalent to a message defiend as follows,
+// where each Item defines an extension field with a field number of 'type_id'
+// and content of 'message'. MessageSet extensions must be non-repeated message
+// fields.
+//
+//	message MessageSet {
+//		repeated group Item = 1 {
+//			required int32 type_id = 2;
+//			required string message = 3;
+//		}
+//	}
+const (
+	FieldItem    = protowire.Number(1)
+	FieldTypeID  = protowire.Number(2)
+	FieldMessage = protowire.Number(3)
+)
+
+// ExtensionName is the field name for extensions of MessageSet.
+//
+// A valid MessageSet extension must be of the form:
+//	message MyMessage {
+//		extend proto2.bridge.MessageSet {
+//			optional MyMessage message_set_extension = 1234;
+//		}
+//		...
+//	}
+const ExtensionName = "message_set_extension"
+
+// IsMessageSet returns whether the message uses the MessageSet wire format.
+func IsMessageSet(md pref.MessageDescriptor) bool {
+	xmd, ok := md.(interface{ IsMessageSet() bool })
+	return ok && xmd.IsMessageSet()
+}
+
+// IsMessageSetExtension reports this field extends a MessageSet.
+func IsMessageSetExtension(fd pref.FieldDescriptor) bool {
+	if fd.Name() != ExtensionName {
+		return false
+	}
+	if fd.FullName().Parent() != fd.Message().FullName() {
+		return false
+	}
+	return IsMessageSet(fd.ContainingMessage())
+}
+
+// FindMessageSetExtension locates a MessageSet extension field by name.
+// In text and JSON formats, the extension name used is the message itself.
+// The extension field name is derived by appending ExtensionName.
+func FindMessageSetExtension(r preg.ExtensionTypeResolver, s pref.FullName) (pref.ExtensionType, error) {
+	name := s.Append(ExtensionName)
+	xt, err := r.FindExtensionByName(name)
+	if err != nil {
+		if err == preg.NotFound {
+			return nil, err
+		}
+		return nil, errors.Wrap(err, "%q", name)
+	}
+	if !IsMessageSetExtension(xt.TypeDescriptor()) {
+		return nil, preg.NotFound
+	}
+	return xt, nil
+}
+
+// SizeField returns the size of a MessageSet item field containing an extension
+// with the given field number, not counting the contents of the message subfield.
+func SizeField(num protowire.Number) int {
+	return 2*protowire.SizeTag(FieldItem) + protowire.SizeTag(FieldTypeID) + protowire.SizeVarint(uint64(num))
+}
+
+// Unmarshal parses a MessageSet.
+//
+// It calls fn with the type ID and value of each item in the MessageSet.
+// Unknown fields are discarded.
+//
+// If wantLen is true, the item values include the varint length prefix.
+// This is ugly, but simplifies the fast-path decoder in internal/impl.
+func Unmarshal(b []byte, wantLen bool, fn func(typeID protowire.Number, value []byte) error) error {
+	for len(b) > 0 {
+		num, wtyp, n := protowire.ConsumeTag(b)
+		if n < 0 {
+			return protowire.ParseError(n)
+		}
+		b = b[n:]
+		if num != FieldItem || wtyp != protowire.StartGroupType {
+			n := protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return protowire.ParseError(n)
+			}
+			b = b[n:]
+			continue
+		}
+		typeID, value, n, err := ConsumeFieldValue(b, wantLen)
+		if err != nil {
+			return err
+		}
+		b = b[n:]
+		if typeID == 0 {
+			continue
+		}
+		if err := fn(typeID, value); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ConsumeFieldValue parses b as a MessageSet item field value until and including
+// the trailing end group marker. It assumes the start group tag has already been parsed.
+// It returns the contents of the type_id and message subfields and the total
+// item length.
+//
+// If wantLen is true, the returned message value includes the length prefix.
+func ConsumeFieldValue(b []byte, wantLen bool) (typeid protowire.Number, message []byte, n int, err error) {
+	ilen := len(b)
+	for {
+		num, wtyp, n := protowire.ConsumeTag(b)
+		if n < 0 {
+			return 0, nil, 0, protowire.ParseError(n)
+		}
+		b = b[n:]
+		switch {
+		case num == FieldItem && wtyp == protowire.EndGroupType:
+			if wantLen && len(message) == 0 {
+				// The message field was missing, which should never happen.
+				// Be prepared for this case anyway.
+				message = protowire.AppendVarint(message, 0)
+			}
+			return typeid, message, ilen - len(b), nil
+		case num == FieldTypeID && wtyp == protowire.VarintType:
+			v, n := protowire.ConsumeVarint(b)
+			if n < 0 {
+				return 0, nil, 0, protowire.ParseError(n)
+			}
+			b = b[n:]
+			if v < 1 || v > math.MaxInt32 {
+				return 0, nil, 0, errors.New("invalid type_id in message set")
+			}
+			typeid = protowire.Number(v)
+		case num == FieldMessage && wtyp == protowire.BytesType:
+			m, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, nil, 0, protowire.ParseError(n)
+			}
+			if message == nil {
+				if wantLen {
+					message = b[:n:n]
+				} else {
+					message = m[:len(m):len(m)]
+				}
+			} else {
+				// This case should never happen in practice, but handle it for
+				// correctness: The MessageSet item contains multiple message
+				// fields, which need to be merged.
+				//
+				// In the case where we're returning the length, this becomes
+				// quite inefficient since we need to strip the length off
+				// the existing data and reconstruct it with the combined length.
+				if wantLen {
+					_, nn := protowire.ConsumeVarint(message)
+					m0 := message[nn:]
+					message = nil
+					message = protowire.AppendVarint(message, uint64(len(m0)+len(m)))
+					message = append(message, m0...)
+					message = append(message, m...)
+				} else {
+					message = append(message, m...)
+				}
+			}
+			b = b[n:]
+		default:
+			// We have no place to put it, so we just ignore unknown fields.
+			n := protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return 0, nil, 0, protowire.ParseError(n)
+			}
+			b = b[n:]
+		}
+	}
+}
+
+// AppendFieldStart appends the start of a MessageSet item field containing
+// an extension with the given number. The caller must add the message
+// subfield (including the tag).
+func AppendFieldStart(b []byte, num protowire.Number) []byte {
+	b = protowire.AppendTag(b, FieldItem, protowire.StartGroupType)
+	b = protowire.AppendTag(b, FieldTypeID, protowire.VarintType)
+	b = protowire.AppendVarint(b, uint64(num))
+	return b
+}
+
+// AppendFieldEnd appends the trailing end group marker for a MessageSet item field.
+func AppendFieldEnd(b []byte) []byte {
+	return protowire.AppendTag(b, FieldItem, protowire.EndGroupType)
+}
+
+// SizeUnknown returns the size of an unknown fields section in MessageSet format.
+//
+// See AppendUnknown.
+func SizeUnknown(unknown []byte) (size int) {
+	for len(unknown) > 0 {
+		num, typ, n := protowire.ConsumeTag(unknown)
+		if n < 0 || typ != protowire.BytesType {
+			return 0
+		}
+		unknown = unknown[n:]
+		_, n = protowire.ConsumeBytes(unknown)
+		if n < 0 {
+			return 0
+		}
+		unknown = unknown[n:]
+		size += SizeField(num) + protowire.SizeTag(FieldMessage) + n
+	}
+	return size
+}
+
+// AppendUnknown appends unknown fields to b in MessageSet format.
+//
+// For historic reasons, unresolved items in a MessageSet are stored in a
+// message's unknown fields section in non-MessageSet format. That is, an
+// unknown item with typeID T and value V appears in the unknown fields as
+// a field with number T and value V.
+//
+// This function converts the unknown fields back into MessageSet form.
+func AppendUnknown(b, unknown []byte) ([]byte, error) {
+	for len(unknown) > 0 {
+		num, typ, n := protowire.ConsumeTag(unknown)
+		if n < 0 || typ != protowire.BytesType {
+			return nil, errors.New("invalid data in message set unknown fields")
+		}
+		unknown = unknown[n:]
+		_, n = protowire.ConsumeBytes(unknown)
+		if n < 0 {
+			return nil, errors.New("invalid data in message set unknown fields")
+		}
+		b = AppendFieldStart(b, num)
+		b = protowire.AppendTag(b, FieldMessage, protowire.BytesType)
+		b = append(b, unknown[:n]...)
+		b = AppendFieldEnd(b)
+		unknown = unknown[n:]
+	}
+	return b, nil
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/tag/tag.go b/vendor/google.golang.org/protobuf/internal/encoding/tag/tag.go
new file mode 100644
index 0000000..16c02d7
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/tag/tag.go
@@ -0,0 +1,207 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tag marshals and unmarshals the legacy struct tags as generated
+// by historical versions of protoc-gen-go.
+package tag
+
+import (
+	"reflect"
+	"strconv"
+	"strings"
+
+	defval "google.golang.org/protobuf/internal/encoding/defval"
+	fdesc "google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+var byteType = reflect.TypeOf(byte(0))
+
+// Unmarshal decodes the tag into a prototype.Field.
+//
+// The goType is needed to determine the original protoreflect.Kind since the
+// tag does not record sufficient information to determine that.
+// The type is the underlying field type (e.g., a repeated field may be
+// represented by []T, but the Go type passed in is just T).
+// A list of enum value descriptors must be provided for enum fields.
+// This does not populate the Enum or Message (except for weak message).
+//
+// This function is a best effort attempt; parsing errors are ignored.
+func Unmarshal(tag string, goType reflect.Type, evs pref.EnumValueDescriptors) pref.FieldDescriptor {
+	f := new(fdesc.Field)
+	f.L0.ParentFile = fdesc.SurrogateProto2
+	for len(tag) > 0 {
+		i := strings.IndexByte(tag, ',')
+		if i < 0 {
+			i = len(tag)
+		}
+		switch s := tag[:i]; {
+		case strings.HasPrefix(s, "name="):
+			f.L0.FullName = pref.FullName(s[len("name="):])
+		case strings.Trim(s, "0123456789") == "":
+			n, _ := strconv.ParseUint(s, 10, 32)
+			f.L1.Number = pref.FieldNumber(n)
+		case s == "opt":
+			f.L1.Cardinality = pref.Optional
+		case s == "req":
+			f.L1.Cardinality = pref.Required
+		case s == "rep":
+			f.L1.Cardinality = pref.Repeated
+		case s == "varint":
+			switch goType.Kind() {
+			case reflect.Bool:
+				f.L1.Kind = pref.BoolKind
+			case reflect.Int32:
+				f.L1.Kind = pref.Int32Kind
+			case reflect.Int64:
+				f.L1.Kind = pref.Int64Kind
+			case reflect.Uint32:
+				f.L1.Kind = pref.Uint32Kind
+			case reflect.Uint64:
+				f.L1.Kind = pref.Uint64Kind
+			}
+		case s == "zigzag32":
+			if goType.Kind() == reflect.Int32 {
+				f.L1.Kind = pref.Sint32Kind
+			}
+		case s == "zigzag64":
+			if goType.Kind() == reflect.Int64 {
+				f.L1.Kind = pref.Sint64Kind
+			}
+		case s == "fixed32":
+			switch goType.Kind() {
+			case reflect.Int32:
+				f.L1.Kind = pref.Sfixed32Kind
+			case reflect.Uint32:
+				f.L1.Kind = pref.Fixed32Kind
+			case reflect.Float32:
+				f.L1.Kind = pref.FloatKind
+			}
+		case s == "fixed64":
+			switch goType.Kind() {
+			case reflect.Int64:
+				f.L1.Kind = pref.Sfixed64Kind
+			case reflect.Uint64:
+				f.L1.Kind = pref.Fixed64Kind
+			case reflect.Float64:
+				f.L1.Kind = pref.DoubleKind
+			}
+		case s == "bytes":
+			switch {
+			case goType.Kind() == reflect.String:
+				f.L1.Kind = pref.StringKind
+			case goType.Kind() == reflect.Slice && goType.Elem() == byteType:
+				f.L1.Kind = pref.BytesKind
+			default:
+				f.L1.Kind = pref.MessageKind
+			}
+		case s == "group":
+			f.L1.Kind = pref.GroupKind
+		case strings.HasPrefix(s, "enum="):
+			f.L1.Kind = pref.EnumKind
+		case strings.HasPrefix(s, "json="):
+			jsonName := s[len("json="):]
+			if jsonName != strs.JSONCamelCase(string(f.L0.FullName.Name())) {
+				f.L1.JSONName.Init(jsonName)
+			}
+		case s == "packed":
+			f.L1.HasPacked = true
+			f.L1.IsPacked = true
+		case strings.HasPrefix(s, "weak="):
+			f.L1.IsWeak = true
+			f.L1.Message = fdesc.PlaceholderMessage(pref.FullName(s[len("weak="):]))
+		case strings.HasPrefix(s, "def="):
+			// The default tag is special in that everything afterwards is the
+			// default regardless of the presence of commas.
+			s, i = tag[len("def="):], len(tag)
+			v, ev, _ := defval.Unmarshal(s, f.L1.Kind, evs, defval.GoTag)
+			f.L1.Default = fdesc.DefaultValue(v, ev)
+		case s == "proto3":
+			f.L0.ParentFile = fdesc.SurrogateProto3
+		}
+		tag = strings.TrimPrefix(tag[i:], ",")
+	}
+
+	// The generator uses the group message name instead of the field name.
+	// We obtain the real field name by lowercasing the group name.
+	if f.L1.Kind == pref.GroupKind {
+		f.L0.FullName = pref.FullName(strings.ToLower(string(f.L0.FullName)))
+	}
+	return f
+}
+
+// Marshal encodes the protoreflect.FieldDescriptor as a tag.
+//
+// The enumName must be provided if the kind is an enum.
+// Historically, the formulation of the enum "name" was the proto package
+// dot-concatenated with the generated Go identifier for the enum type.
+// Depending on the context on how Marshal is called, there are different ways
+// through which that information is determined. As such it is the caller's
+// responsibility to provide a function to obtain that information.
+func Marshal(fd pref.FieldDescriptor, enumName string) string {
+	var tag []string
+	switch fd.Kind() {
+	case pref.BoolKind, pref.EnumKind, pref.Int32Kind, pref.Uint32Kind, pref.Int64Kind, pref.Uint64Kind:
+		tag = append(tag, "varint")
+	case pref.Sint32Kind:
+		tag = append(tag, "zigzag32")
+	case pref.Sint64Kind:
+		tag = append(tag, "zigzag64")
+	case pref.Sfixed32Kind, pref.Fixed32Kind, pref.FloatKind:
+		tag = append(tag, "fixed32")
+	case pref.Sfixed64Kind, pref.Fixed64Kind, pref.DoubleKind:
+		tag = append(tag, "fixed64")
+	case pref.StringKind, pref.BytesKind, pref.MessageKind:
+		tag = append(tag, "bytes")
+	case pref.GroupKind:
+		tag = append(tag, "group")
+	}
+	tag = append(tag, strconv.Itoa(int(fd.Number())))
+	switch fd.Cardinality() {
+	case pref.Optional:
+		tag = append(tag, "opt")
+	case pref.Required:
+		tag = append(tag, "req")
+	case pref.Repeated:
+		tag = append(tag, "rep")
+	}
+	if fd.IsPacked() {
+		tag = append(tag, "packed")
+	}
+	name := string(fd.Name())
+	if fd.Kind() == pref.GroupKind {
+		// The name of the FieldDescriptor for a group field is
+		// lowercased. To find the original capitalization, we
+		// look in the field's MessageType.
+		name = string(fd.Message().Name())
+	}
+	tag = append(tag, "name="+name)
+	if jsonName := fd.JSONName(); jsonName != "" && jsonName != name && !fd.IsExtension() {
+		// NOTE: The jsonName != name condition is suspect, but it preserve
+		// the exact same semantics from the previous generator.
+		tag = append(tag, "json="+jsonName)
+	}
+	if fd.IsWeak() {
+		tag = append(tag, "weak="+string(fd.Message().FullName()))
+	}
+	// The previous implementation does not tag extension fields as proto3,
+	// even when the field is defined in a proto3 file. Match that behavior
+	// for consistency.
+	if fd.Syntax() == pref.Proto3 && !fd.IsExtension() {
+		tag = append(tag, "proto3")
+	}
+	if fd.Kind() == pref.EnumKind && enumName != "" {
+		tag = append(tag, "enum="+enumName)
+	}
+	if fd.ContainingOneof() != nil {
+		tag = append(tag, "oneof")
+	}
+	// This must appear last in the tag, since commas in strings aren't escaped.
+	if fd.HasDefault() {
+		def, _ := defval.Marshal(fd.Default(), fd.DefaultEnumValue(), fd.Kind(), defval.GoTag)
+		tag = append(tag, "def="+def)
+	}
+	return strings.Join(tag, ",")
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/decode.go b/vendor/google.golang.org/protobuf/internal/encoding/text/decode.go
new file mode 100644
index 0000000..eb10ea1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/decode.go
@@ -0,0 +1,665 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package text
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"regexp"
+	"strconv"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/internal/errors"
+)
+
+// Decoder is a token-based textproto decoder.
+type Decoder struct {
+	// lastCall is last method called, either readCall or peekCall.
+	// Initial value is readCall.
+	lastCall call
+
+	// lastToken contains the last read token.
+	lastToken Token
+
+	// lastErr contains the last read error.
+	lastErr error
+
+	// openStack is a stack containing the byte characters for MessageOpen and
+	// ListOpen kinds. The top of stack represents the message or the list that
+	// the current token is nested in. An empty stack means the current token is
+	// at the top level message. The characters '{' and '<' both represent the
+	// MessageOpen kind.
+	openStack []byte
+
+	// orig is used in reporting line and column.
+	orig []byte
+	// in contains the unconsumed input.
+	in []byte
+}
+
+// NewDecoder returns a Decoder to read the given []byte.
+func NewDecoder(b []byte) *Decoder {
+	return &Decoder{orig: b, in: b}
+}
+
+// ErrUnexpectedEOF means that EOF was encountered in the middle of the input.
+var ErrUnexpectedEOF = errors.New("%v", io.ErrUnexpectedEOF)
+
+// call specifies which Decoder method was invoked.
+type call uint8
+
+const (
+	readCall call = iota
+	peekCall
+)
+
+// Peek looks ahead and returns the next token and error without advancing a read.
+func (d *Decoder) Peek() (Token, error) {
+	defer func() { d.lastCall = peekCall }()
+	if d.lastCall == readCall {
+		d.lastToken, d.lastErr = d.Read()
+	}
+	return d.lastToken, d.lastErr
+}
+
+// Read returns the next token.
+// It will return an error if there is no valid token.
+func (d *Decoder) Read() (Token, error) {
+	defer func() { d.lastCall = readCall }()
+	if d.lastCall == peekCall {
+		return d.lastToken, d.lastErr
+	}
+
+	tok, err := d.parseNext(d.lastToken.kind)
+	if err != nil {
+		return Token{}, err
+	}
+
+	switch tok.kind {
+	case comma, semicolon:
+		tok, err = d.parseNext(tok.kind)
+		if err != nil {
+			return Token{}, err
+		}
+	}
+	d.lastToken = tok
+	return tok, nil
+}
+
+const (
+	mismatchedFmt = "mismatched close character %q"
+	unexpectedFmt = "unexpected character %q"
+)
+
+// parseNext parses the next Token based on given last kind.
+func (d *Decoder) parseNext(lastKind Kind) (Token, error) {
+	// Trim leading spaces.
+	d.consume(0)
+	isEOF := false
+	if len(d.in) == 0 {
+		isEOF = true
+	}
+
+	switch lastKind {
+	case EOF:
+		return d.consumeToken(EOF, 0, 0), nil
+
+	case bof:
+		// Start of top level message. Next token can be EOF or Name.
+		if isEOF {
+			return d.consumeToken(EOF, 0, 0), nil
+		}
+		return d.parseFieldName()
+
+	case Name:
+		// Next token can be MessageOpen, ListOpen or Scalar.
+		if isEOF {
+			return Token{}, ErrUnexpectedEOF
+		}
+		switch ch := d.in[0]; ch {
+		case '{', '<':
+			d.pushOpenStack(ch)
+			return d.consumeToken(MessageOpen, 1, 0), nil
+		case '[':
+			d.pushOpenStack(ch)
+			return d.consumeToken(ListOpen, 1, 0), nil
+		default:
+			return d.parseScalar()
+		}
+
+	case Scalar:
+		openKind, closeCh := d.currentOpenKind()
+		switch openKind {
+		case bof:
+			// Top level message.
+			// 	Next token can be EOF, comma, semicolon or Name.
+			if isEOF {
+				return d.consumeToken(EOF, 0, 0), nil
+			}
+			switch d.in[0] {
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		case MessageOpen:
+			// Next token can be MessageClose, comma, semicolon or Name.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case closeCh:
+				d.popOpenStack()
+				return d.consumeToken(MessageClose, 1, 0), nil
+			case otherCloseChar[closeCh]:
+				return Token{}, d.newSyntaxError(mismatchedFmt, ch)
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		case ListOpen:
+			// Next token can be ListClose or comma.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case ']':
+				d.popOpenStack()
+				return d.consumeToken(ListClose, 1, 0), nil
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			default:
+				return Token{}, d.newSyntaxError(unexpectedFmt, ch)
+			}
+		}
+
+	case MessageOpen:
+		// Next token can be MessageClose or Name.
+		if isEOF {
+			return Token{}, ErrUnexpectedEOF
+		}
+		_, closeCh := d.currentOpenKind()
+		switch ch := d.in[0]; ch {
+		case closeCh:
+			d.popOpenStack()
+			return d.consumeToken(MessageClose, 1, 0), nil
+		case otherCloseChar[closeCh]:
+			return Token{}, d.newSyntaxError(mismatchedFmt, ch)
+		default:
+			return d.parseFieldName()
+		}
+
+	case MessageClose:
+		openKind, closeCh := d.currentOpenKind()
+		switch openKind {
+		case bof:
+			// Top level message.
+			// Next token can be EOF, comma, semicolon or Name.
+			if isEOF {
+				return d.consumeToken(EOF, 0, 0), nil
+			}
+			switch ch := d.in[0]; ch {
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		case MessageOpen:
+			// Next token can be MessageClose, comma, semicolon or Name.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case closeCh:
+				d.popOpenStack()
+				return d.consumeToken(MessageClose, 1, 0), nil
+			case otherCloseChar[closeCh]:
+				return Token{}, d.newSyntaxError(mismatchedFmt, ch)
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		case ListOpen:
+			// Next token can be ListClose or comma
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case closeCh:
+				d.popOpenStack()
+				return d.consumeToken(ListClose, 1, 0), nil
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			default:
+				return Token{}, d.newSyntaxError(unexpectedFmt, ch)
+			}
+		}
+
+	case ListOpen:
+		// Next token can be ListClose, MessageStart or Scalar.
+		if isEOF {
+			return Token{}, ErrUnexpectedEOF
+		}
+		switch ch := d.in[0]; ch {
+		case ']':
+			d.popOpenStack()
+			return d.consumeToken(ListClose, 1, 0), nil
+		case '{', '<':
+			d.pushOpenStack(ch)
+			return d.consumeToken(MessageOpen, 1, 0), nil
+		default:
+			return d.parseScalar()
+		}
+
+	case ListClose:
+		openKind, closeCh := d.currentOpenKind()
+		switch openKind {
+		case bof:
+			// Top level message.
+			// Next token can be EOF, comma, semicolon or Name.
+			if isEOF {
+				return d.consumeToken(EOF, 0, 0), nil
+			}
+			switch ch := d.in[0]; ch {
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		case MessageOpen:
+			// Next token can be MessageClose, comma, semicolon or Name.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case closeCh:
+				d.popOpenStack()
+				return d.consumeToken(MessageClose, 1, 0), nil
+			case otherCloseChar[closeCh]:
+				return Token{}, d.newSyntaxError(mismatchedFmt, ch)
+			case ',':
+				return d.consumeToken(comma, 1, 0), nil
+			case ';':
+				return d.consumeToken(semicolon, 1, 0), nil
+			default:
+				return d.parseFieldName()
+			}
+
+		default:
+			// It is not possible to have this case. Let it panic below.
+		}
+
+	case comma, semicolon:
+		openKind, closeCh := d.currentOpenKind()
+		switch openKind {
+		case bof:
+			// Top level message. Next token can be EOF or Name.
+			if isEOF {
+				return d.consumeToken(EOF, 0, 0), nil
+			}
+			return d.parseFieldName()
+
+		case MessageOpen:
+			// Next token can be MessageClose or Name.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case closeCh:
+				d.popOpenStack()
+				return d.consumeToken(MessageClose, 1, 0), nil
+			case otherCloseChar[closeCh]:
+				return Token{}, d.newSyntaxError(mismatchedFmt, ch)
+			default:
+				return d.parseFieldName()
+			}
+
+		case ListOpen:
+			if lastKind == semicolon {
+				// It is not be possible to have this case as logic here
+				// should not have produced a semicolon Token when inside a
+				// list. Let it panic below.
+				break
+			}
+			// Next token can be MessageOpen or Scalar.
+			if isEOF {
+				return Token{}, ErrUnexpectedEOF
+			}
+			switch ch := d.in[0]; ch {
+			case '{', '<':
+				d.pushOpenStack(ch)
+				return d.consumeToken(MessageOpen, 1, 0), nil
+			default:
+				return d.parseScalar()
+			}
+		}
+	}
+
+	line, column := d.Position(len(d.orig) - len(d.in))
+	panic(fmt.Sprintf("Decoder.parseNext: bug at handling line %d:%d with lastKind=%v", line, column, lastKind))
+}
+
+var otherCloseChar = map[byte]byte{
+	'}': '>',
+	'>': '}',
+}
+
+// currentOpenKind indicates whether current position is inside a message, list
+// or top-level message by returning MessageOpen, ListOpen or bof respectively.
+// If the returned kind is either a MessageOpen or ListOpen, it also returns the
+// corresponding closing character.
+func (d *Decoder) currentOpenKind() (Kind, byte) {
+	if len(d.openStack) == 0 {
+		return bof, 0
+	}
+	openCh := d.openStack[len(d.openStack)-1]
+	switch openCh {
+	case '{':
+		return MessageOpen, '}'
+	case '<':
+		return MessageOpen, '>'
+	case '[':
+		return ListOpen, ']'
+	}
+	panic(fmt.Sprintf("Decoder: openStack contains invalid byte %s", string(openCh)))
+}
+
+func (d *Decoder) pushOpenStack(ch byte) {
+	d.openStack = append(d.openStack, ch)
+}
+
+func (d *Decoder) popOpenStack() {
+	d.openStack = d.openStack[:len(d.openStack)-1]
+}
+
+// parseFieldName parses field name and separator.
+func (d *Decoder) parseFieldName() (tok Token, err error) {
+	defer func() {
+		if err == nil && d.tryConsumeChar(':') {
+			tok.attrs |= hasSeparator
+		}
+	}()
+
+	// Extension or Any type URL.
+	if d.in[0] == '[' {
+		return d.parseTypeName()
+	}
+
+	// Identifier.
+	if size := parseIdent(d.in, false); size > 0 {
+		return d.consumeToken(Name, size, uint8(IdentName)), nil
+	}
+
+	// Field number. Identify if input is a valid number that is not negative
+	// and is decimal integer within 32-bit range.
+	if num := parseNumber(d.in); num.size > 0 {
+		if !num.neg && num.kind == numDec {
+			if _, err := strconv.ParseInt(string(d.in[:num.size]), 10, 32); err == nil {
+				return d.consumeToken(Name, num.size, uint8(FieldNumber)), nil
+			}
+		}
+		return Token{}, d.newSyntaxError("invalid field number: %s", d.in[:num.size])
+	}
+
+	return Token{}, d.newSyntaxError("invalid field name: %s", errRegexp.Find(d.in))
+}
+
+// parseTypeName parses Any type URL or extension field name. The name is
+// enclosed in [ and ] characters. The C++ parser does not handle many legal URL
+// strings. This implementation is more liberal and allows for the pattern
+// ^[-_a-zA-Z0-9]+([./][-_a-zA-Z0-9]+)*`). Whitespaces and comments are allowed
+// in between [ ], '.', '/' and the sub names.
+func (d *Decoder) parseTypeName() (Token, error) {
+	startPos := len(d.orig) - len(d.in)
+	// Use alias s to advance first in order to use d.in for error handling.
+	// Caller already checks for [ as first character.
+	s := consume(d.in[1:], 0)
+	if len(s) == 0 {
+		return Token{}, ErrUnexpectedEOF
+	}
+
+	var name []byte
+	for len(s) > 0 && isTypeNameChar(s[0]) {
+		name = append(name, s[0])
+		s = s[1:]
+	}
+	s = consume(s, 0)
+
+	var closed bool
+	for len(s) > 0 && !closed {
+		switch {
+		case s[0] == ']':
+			s = s[1:]
+			closed = true
+
+		case s[0] == '/', s[0] == '.':
+			if len(name) > 0 && (name[len(name)-1] == '/' || name[len(name)-1] == '.') {
+				return Token{}, d.newSyntaxError("invalid type URL/extension field name: %s",
+					d.orig[startPos:len(d.orig)-len(s)+1])
+			}
+			name = append(name, s[0])
+			s = s[1:]
+			s = consume(s, 0)
+			for len(s) > 0 && isTypeNameChar(s[0]) {
+				name = append(name, s[0])
+				s = s[1:]
+			}
+			s = consume(s, 0)
+
+		default:
+			return Token{}, d.newSyntaxError(
+				"invalid type URL/extension field name: %s", d.orig[startPos:len(d.orig)-len(s)+1])
+		}
+	}
+
+	if !closed {
+		return Token{}, ErrUnexpectedEOF
+	}
+
+	// First character cannot be '.'. Last character cannot be '.' or '/'.
+	size := len(name)
+	if size == 0 || name[0] == '.' || name[size-1] == '.' || name[size-1] == '/' {
+		return Token{}, d.newSyntaxError("invalid type URL/extension field name: %s",
+			d.orig[startPos:len(d.orig)-len(s)])
+	}
+
+	d.in = s
+	endPos := len(d.orig) - len(d.in)
+	d.consume(0)
+
+	return Token{
+		kind:  Name,
+		attrs: uint8(TypeName),
+		pos:   startPos,
+		raw:   d.orig[startPos:endPos],
+		str:   string(name),
+	}, nil
+}
+
+func isTypeNameChar(b byte) bool {
+	return (b == '-' || b == '_' ||
+		('0' <= b && b <= '9') ||
+		('a' <= b && b <= 'z') ||
+		('A' <= b && b <= 'Z'))
+}
+
+func isWhiteSpace(b byte) bool {
+	switch b {
+	case ' ', '\n', '\r', '\t':
+		return true
+	default:
+		return false
+	}
+}
+
+// parseIdent parses an unquoted proto identifier and returns size.
+// If allowNeg is true, it allows '-' to be the first character in the
+// identifier. This is used when parsing literal values like -infinity, etc.
+// Regular expression matches an identifier: `^[_a-zA-Z][_a-zA-Z0-9]*`
+func parseIdent(input []byte, allowNeg bool) int {
+	var size int
+
+	s := input
+	if len(s) == 0 {
+		return 0
+	}
+
+	if allowNeg && s[0] == '-' {
+		s = s[1:]
+		size++
+		if len(s) == 0 {
+			return 0
+		}
+	}
+
+	switch {
+	case s[0] == '_',
+		'a' <= s[0] && s[0] <= 'z',
+		'A' <= s[0] && s[0] <= 'Z':
+		s = s[1:]
+		size++
+	default:
+		return 0
+	}
+
+	for len(s) > 0 && (s[0] == '_' ||
+		'a' <= s[0] && s[0] <= 'z' ||
+		'A' <= s[0] && s[0] <= 'Z' ||
+		'0' <= s[0] && s[0] <= '9') {
+		s = s[1:]
+		size++
+	}
+
+	if len(s) > 0 && !isDelim(s[0]) {
+		return 0
+	}
+
+	return size
+}
+
+// parseScalar parses for a string, literal or number value.
+func (d *Decoder) parseScalar() (Token, error) {
+	if d.in[0] == '"' || d.in[0] == '\'' {
+		return d.parseStringValue()
+	}
+
+	if tok, ok := d.parseLiteralValue(); ok {
+		return tok, nil
+	}
+
+	if tok, ok := d.parseNumberValue(); ok {
+		return tok, nil
+	}
+
+	return Token{}, d.newSyntaxError("invalid scalar value: %s", errRegexp.Find(d.in))
+}
+
+// parseLiteralValue parses a literal value. A literal value is used for
+// bools, special floats and enums. This function simply identifies that the
+// field value is a literal.
+func (d *Decoder) parseLiteralValue() (Token, bool) {
+	size := parseIdent(d.in, true)
+	if size == 0 {
+		return Token{}, false
+	}
+	return d.consumeToken(Scalar, size, literalValue), true
+}
+
+// consumeToken constructs a Token for given Kind from d.in and consumes given
+// size-length from it.
+func (d *Decoder) consumeToken(kind Kind, size int, attrs uint8) Token {
+	// Important to compute raw and pos before consuming.
+	tok := Token{
+		kind:  kind,
+		attrs: attrs,
+		pos:   len(d.orig) - len(d.in),
+		raw:   d.in[:size],
+	}
+	d.consume(size)
+	return tok
+}
+
+// newSyntaxError returns a syntax error with line and column information for
+// current position.
+func (d *Decoder) newSyntaxError(f string, x ...interface{}) error {
+	e := errors.New(f, x...)
+	line, column := d.Position(len(d.orig) - len(d.in))
+	return errors.New("syntax error (line %d:%d): %v", line, column, e)
+}
+
+// Position returns line and column number of given index of the original input.
+// It will panic if index is out of range.
+func (d *Decoder) Position(idx int) (line int, column int) {
+	b := d.orig[:idx]
+	line = bytes.Count(b, []byte("\n")) + 1
+	if i := bytes.LastIndexByte(b, '\n'); i >= 0 {
+		b = b[i+1:]
+	}
+	column = utf8.RuneCount(b) + 1 // ignore multi-rune characters
+	return line, column
+}
+
+func (d *Decoder) tryConsumeChar(c byte) bool {
+	if len(d.in) > 0 && d.in[0] == c {
+		d.consume(1)
+		return true
+	}
+	return false
+}
+
+// consume consumes n bytes of input and any subsequent whitespace or comments.
+func (d *Decoder) consume(n int) {
+	d.in = consume(d.in, n)
+	return
+}
+
+// consume consumes n bytes of input and any subsequent whitespace or comments.
+func consume(b []byte, n int) []byte {
+	b = b[n:]
+	for len(b) > 0 {
+		switch b[0] {
+		case ' ', '\n', '\r', '\t':
+			b = b[1:]
+		case '#':
+			if i := bytes.IndexByte(b, '\n'); i >= 0 {
+				b = b[i+len("\n"):]
+			} else {
+				b = nil
+			}
+		default:
+			return b
+		}
+	}
+	return b
+}
+
+// Any sequence that looks like a non-delimiter (for error reporting).
+var errRegexp = regexp.MustCompile(`^([-+._a-zA-Z0-9\/]+|.)`)
+
+// isDelim returns true if given byte is a delimiter character.
+func isDelim(c byte) bool {
+	return !(c == '-' || c == '+' || c == '.' || c == '_' ||
+		('a' <= c && c <= 'z') ||
+		('A' <= c && c <= 'Z') ||
+		('0' <= c && c <= '9'))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/decode_number.go b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_number.go
new file mode 100644
index 0000000..f2d90b7
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_number.go
@@ -0,0 +1,190 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package text
+
+// parseNumberValue parses a number from the input and returns a Token object.
+func (d *Decoder) parseNumberValue() (Token, bool) {
+	in := d.in
+	num := parseNumber(in)
+	if num.size == 0 {
+		return Token{}, false
+	}
+	numAttrs := num.kind
+	if num.neg {
+		numAttrs |= isNegative
+	}
+	strSize := num.size
+	last := num.size - 1
+	if num.kind == numFloat && (d.in[last] == 'f' || d.in[last] == 'F') {
+		strSize = last
+	}
+	tok := Token{
+		kind:     Scalar,
+		attrs:    numberValue,
+		pos:      len(d.orig) - len(d.in),
+		raw:      d.in[:num.size],
+		str:      string(d.in[:strSize]),
+		numAttrs: numAttrs,
+	}
+	d.consume(num.size)
+	return tok, true
+}
+
+const (
+	numDec uint8 = (1 << iota) / 2
+	numHex
+	numOct
+	numFloat
+)
+
+// number is the result of parsing out a valid number from parseNumber. It
+// contains data for doing float or integer conversion via the strconv package
+// in conjunction with the input bytes.
+type number struct {
+	kind uint8
+	neg  bool
+	size int
+}
+
+// parseNumber constructs a number object from given input. It allows for the
+// following patterns:
+//   integer: ^-?([1-9][0-9]*|0[xX][0-9a-fA-F]+|0[0-7]*)
+//   float: ^-?((0|[1-9][0-9]*)?([.][0-9]*)?([eE][+-]?[0-9]+)?[fF]?)
+// It also returns the number of parsed bytes for the given number, 0 if it is
+// not a number.
+func parseNumber(input []byte) number {
+	kind := numDec
+	var size int
+	var neg bool
+
+	s := input
+	if len(s) == 0 {
+		return number{}
+	}
+
+	// Optional -
+	if s[0] == '-' {
+		neg = true
+		s = s[1:]
+		size++
+		if len(s) == 0 {
+			return number{}
+		}
+	}
+
+	// C++ allows for whitespace and comments in between the negative sign and
+	// the rest of the number. This logic currently does not but is consistent
+	// with v1.
+
+	switch {
+	case s[0] == '0':
+		if len(s) > 1 {
+			switch {
+			case s[1] == 'x' || s[1] == 'X':
+				// Parse as hex number.
+				kind = numHex
+				n := 2
+				s = s[2:]
+				for len(s) > 0 && (('0' <= s[0] && s[0] <= '9') ||
+					('a' <= s[0] && s[0] <= 'f') ||
+					('A' <= s[0] && s[0] <= 'F')) {
+					s = s[1:]
+					n++
+				}
+				if n == 2 {
+					return number{}
+				}
+				size += n
+
+			case '0' <= s[1] && s[1] <= '7':
+				// Parse as octal number.
+				kind = numOct
+				n := 2
+				s = s[2:]
+				for len(s) > 0 && '0' <= s[0] && s[0] <= '7' {
+					s = s[1:]
+					n++
+				}
+				size += n
+			}
+
+			if kind&(numHex|numOct) > 0 {
+				if len(s) > 0 && !isDelim(s[0]) {
+					return number{}
+				}
+				return number{kind: kind, neg: neg, size: size}
+			}
+		}
+		s = s[1:]
+		size++
+
+	case '1' <= s[0] && s[0] <= '9':
+		n := 1
+		s = s[1:]
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+			n++
+		}
+		size += n
+
+	case s[0] == '.':
+		// Set kind to numFloat to signify the intent to parse as float. And
+		// that it needs to have other digits after '.'.
+		kind = numFloat
+
+	default:
+		return number{}
+	}
+
+	// . followed by 0 or more digits.
+	if len(s) > 0 && s[0] == '.' {
+		n := 1
+		s = s[1:]
+		// If decimal point was before any digits, it should be followed by
+		// other digits.
+		if len(s) == 0 && kind == numFloat {
+			return number{}
+		}
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+			n++
+		}
+		size += n
+		kind = numFloat
+	}
+
+	// e or E followed by an optional - or + and 1 or more digits.
+	if len(s) >= 2 && (s[0] == 'e' || s[0] == 'E') {
+		kind = numFloat
+		s = s[1:]
+		n := 1
+		if s[0] == '+' || s[0] == '-' {
+			s = s[1:]
+			n++
+			if len(s) == 0 {
+				return number{}
+			}
+		}
+		for len(s) > 0 && '0' <= s[0] && s[0] <= '9' {
+			s = s[1:]
+			n++
+		}
+		size += n
+	}
+
+	// Optional suffix f or F for floats.
+	if len(s) > 0 && (s[0] == 'f' || s[0] == 'F') {
+		kind = numFloat
+		s = s[1:]
+		size++
+	}
+
+	// Check that next byte is a delimiter or it is at the end.
+	if len(s) > 0 && !isDelim(s[0]) {
+		return number{}
+	}
+
+	return number{kind: kind, neg: neg, size: size}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/decode_string.go b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_string.go
new file mode 100644
index 0000000..d4d3490
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_string.go
@@ -0,0 +1,161 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package text
+
+import (
+	"bytes"
+	"strconv"
+	"strings"
+	"unicode"
+	"unicode/utf16"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/internal/strs"
+)
+
+// parseStringValue parses string field token.
+// This differs from parseString since the text format allows
+// multiple back-to-back string literals where they are semantically treated
+// as a single large string with all values concatenated.
+//
+// E.g., `"foo" "bar" "baz"` => "foobarbaz"
+func (d *Decoder) parseStringValue() (Token, error) {
+	// Note that the ending quote is sufficient to unambiguously mark the end
+	// of a string. Thus, the text grammar does not require intervening
+	// whitespace or control characters in-between strings.
+	// Thus, the following is valid:
+	//	`"foo"'bar'"baz"` => "foobarbaz"
+	in0 := d.in
+	var ss []string
+	for len(d.in) > 0 && (d.in[0] == '"' || d.in[0] == '\'') {
+		s, err := d.parseString()
+		if err != nil {
+			return Token{}, err
+		}
+		ss = append(ss, s)
+	}
+	// d.in already points to the end of the value at this point.
+	return Token{
+		kind:  Scalar,
+		attrs: stringValue,
+		pos:   len(d.orig) - len(in0),
+		raw:   in0[:len(in0)-len(d.in)],
+		str:   strings.Join(ss, ""),
+	}, nil
+}
+
+// parseString parses a string value enclosed in " or '.
+func (d *Decoder) parseString() (string, error) {
+	in := d.in
+	if len(in) == 0 {
+		return "", ErrUnexpectedEOF
+	}
+	quote := in[0]
+	in = in[1:]
+	i := indexNeedEscapeInBytes(in)
+	in, out := in[i:], in[:i:i] // set cap to prevent mutations
+	for len(in) > 0 {
+		switch r, n := utf8.DecodeRune(in); {
+		case r == utf8.RuneError && n == 1:
+			return "", d.newSyntaxError("invalid UTF-8 detected")
+		case r == 0 || r == '\n':
+			return "", d.newSyntaxError("invalid character %q in string", r)
+		case r == rune(quote):
+			in = in[1:]
+			d.consume(len(d.in) - len(in))
+			return string(out), nil
+		case r == '\\':
+			if len(in) < 2 {
+				return "", ErrUnexpectedEOF
+			}
+			switch r := in[1]; r {
+			case '"', '\'', '\\', '?':
+				in, out = in[2:], append(out, r)
+			case 'a':
+				in, out = in[2:], append(out, '\a')
+			case 'b':
+				in, out = in[2:], append(out, '\b')
+			case 'n':
+				in, out = in[2:], append(out, '\n')
+			case 'r':
+				in, out = in[2:], append(out, '\r')
+			case 't':
+				in, out = in[2:], append(out, '\t')
+			case 'v':
+				in, out = in[2:], append(out, '\v')
+			case 'f':
+				in, out = in[2:], append(out, '\f')
+			case '0', '1', '2', '3', '4', '5', '6', '7':
+				// One, two, or three octal characters.
+				n := len(in[1:]) - len(bytes.TrimLeft(in[1:], "01234567"))
+				if n > 3 {
+					n = 3
+				}
+				v, err := strconv.ParseUint(string(in[1:1+n]), 8, 8)
+				if err != nil {
+					return "", d.newSyntaxError("invalid octal escape code %q in string", in[:1+n])
+				}
+				in, out = in[1+n:], append(out, byte(v))
+			case 'x':
+				// One or two hexadecimal characters.
+				n := len(in[2:]) - len(bytes.TrimLeft(in[2:], "0123456789abcdefABCDEF"))
+				if n > 2 {
+					n = 2
+				}
+				v, err := strconv.ParseUint(string(in[2:2+n]), 16, 8)
+				if err != nil {
+					return "", d.newSyntaxError("invalid hex escape code %q in string", in[:2+n])
+				}
+				in, out = in[2+n:], append(out, byte(v))
+			case 'u', 'U':
+				// Four or eight hexadecimal characters
+				n := 6
+				if r == 'U' {
+					n = 10
+				}
+				if len(in) < n {
+					return "", ErrUnexpectedEOF
+				}
+				v, err := strconv.ParseUint(string(in[2:n]), 16, 32)
+				if utf8.MaxRune < v || err != nil {
+					return "", d.newSyntaxError("invalid Unicode escape code %q in string", in[:n])
+				}
+				in = in[n:]
+
+				r := rune(v)
+				if utf16.IsSurrogate(r) {
+					if len(in) < 6 {
+						return "", ErrUnexpectedEOF
+					}
+					v, err := strconv.ParseUint(string(in[2:6]), 16, 16)
+					r = utf16.DecodeRune(r, rune(v))
+					if in[0] != '\\' || in[1] != 'u' || r == unicode.ReplacementChar || err != nil {
+						return "", d.newSyntaxError("invalid Unicode escape code %q in string", in[:6])
+					}
+					in = in[6:]
+				}
+				out = append(out, string(r)...)
+			default:
+				return "", d.newSyntaxError("invalid escape code %q in string", in[:2])
+			}
+		default:
+			i := indexNeedEscapeInBytes(in[n:])
+			in, out = in[n+i:], append(out, in[:n+i]...)
+		}
+	}
+	return "", ErrUnexpectedEOF
+}
+
+// indexNeedEscapeInString returns the index of the character that needs
+// escaping. If no characters need escaping, this returns the input length.
+func indexNeedEscapeInBytes(b []byte) int { return indexNeedEscapeInString(strs.UnsafeString(b)) }
+
+// UnmarshalString returns an unescaped string given a textproto string value.
+// String value needs to contain single or double quotes. This is only used by
+// internal/encoding/defval package for unmarshaling bytes.
+func UnmarshalString(s string) (string, error) {
+	d := NewDecoder([]byte(s))
+	return d.parseString()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/decode_token.go b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_token.go
new file mode 100644
index 0000000..83d2b0d
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/decode_token.go
@@ -0,0 +1,373 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package text
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	"google.golang.org/protobuf/internal/flags"
+)
+
+// Kind represents a token kind expressible in the textproto format.
+type Kind uint8
+
+// Kind values.
+const (
+	Invalid Kind = iota
+	EOF
+	Name   // Name indicates the field name.
+	Scalar // Scalar are scalar values, e.g. "string", 47, ENUM_LITERAL, true.
+	MessageOpen
+	MessageClose
+	ListOpen
+	ListClose
+
+	// comma and semi-colon are only for parsing in between values and should not be exposed.
+	comma
+	semicolon
+
+	// bof indicates beginning of file, which is the default token
+	// kind at the beginning of parsing.
+	bof = Invalid
+)
+
+func (t Kind) String() string {
+	switch t {
+	case Invalid:
+		return "<invalid>"
+	case EOF:
+		return "eof"
+	case Scalar:
+		return "scalar"
+	case Name:
+		return "name"
+	case MessageOpen:
+		return "{"
+	case MessageClose:
+		return "}"
+	case ListOpen:
+		return "["
+	case ListClose:
+		return "]"
+	case comma:
+		return ","
+	case semicolon:
+		return ";"
+	default:
+		return fmt.Sprintf("<invalid:%v>", uint8(t))
+	}
+}
+
+// NameKind represents different types of field names.
+type NameKind uint8
+
+// NameKind values.
+const (
+	IdentName NameKind = iota + 1
+	TypeName
+	FieldNumber
+)
+
+func (t NameKind) String() string {
+	switch t {
+	case IdentName:
+		return "IdentName"
+	case TypeName:
+		return "TypeName"
+	case FieldNumber:
+		return "FieldNumber"
+	default:
+		return fmt.Sprintf("<invalid:%v>", uint8(t))
+	}
+}
+
+// Bit mask in Token.attrs to indicate if a Name token is followed by the
+// separator char ':'. The field name separator char is optional for message
+// field or repeated message field, but required for all other types. Decoder
+// simply indicates whether a Name token is followed by separator or not.  It is
+// up to the prototext package to validate.
+const hasSeparator = 1 << 7
+
+// Scalar value types.
+const (
+	numberValue = iota + 1
+	stringValue
+	literalValue
+)
+
+// Bit mask in Token.numAttrs to indicate that the number is a negative.
+const isNegative = 1 << 7
+
+// Token provides a parsed token kind and value. Values are provided by the
+// different accessor methods.
+type Token struct {
+	// Kind of the Token object.
+	kind Kind
+	// attrs contains metadata for the following Kinds:
+	// Name: hasSeparator bit and one of NameKind.
+	// Scalar: one of numberValue, stringValue, literalValue.
+	attrs uint8
+	// numAttrs contains metadata for numberValue:
+	// - highest bit is whether negative or positive.
+	// - lower bits indicate one of numDec, numHex, numOct, numFloat.
+	numAttrs uint8
+	// pos provides the position of the token in the original input.
+	pos int
+	// raw bytes of the serialized token.
+	// This is a subslice into the original input.
+	raw []byte
+	// str contains parsed string for the following:
+	// - stringValue of Scalar kind
+	// - numberValue of Scalar kind
+	// - TypeName of Name kind
+	str string
+}
+
+// Kind returns the token kind.
+func (t Token) Kind() Kind {
+	return t.kind
+}
+
+// RawString returns the read value in string.
+func (t Token) RawString() string {
+	return string(t.raw)
+}
+
+// Pos returns the token position from the input.
+func (t Token) Pos() int {
+	return t.pos
+}
+
+// NameKind returns IdentName, TypeName or FieldNumber.
+// It panics if type is not Name.
+func (t Token) NameKind() NameKind {
+	if t.kind == Name {
+		return NameKind(t.attrs &^ hasSeparator)
+	}
+	panic(fmt.Sprintf("Token is not a Name type: %s", t.kind))
+}
+
+// HasSeparator returns true if the field name is followed by the separator char
+// ':', else false. It panics if type is not Name.
+func (t Token) HasSeparator() bool {
+	if t.kind == Name {
+		return t.attrs&hasSeparator != 0
+	}
+	panic(fmt.Sprintf("Token is not a Name type: %s", t.kind))
+}
+
+// IdentName returns the value for IdentName type.
+func (t Token) IdentName() string {
+	if t.kind == Name && t.attrs&uint8(IdentName) != 0 {
+		return string(t.raw)
+	}
+	panic(fmt.Sprintf("Token is not an IdentName: %s:%s", t.kind, NameKind(t.attrs&^hasSeparator)))
+}
+
+// TypeName returns the value for TypeName type.
+func (t Token) TypeName() string {
+	if t.kind == Name && t.attrs&uint8(TypeName) != 0 {
+		return t.str
+	}
+	panic(fmt.Sprintf("Token is not a TypeName: %s:%s", t.kind, NameKind(t.attrs&^hasSeparator)))
+}
+
+// FieldNumber returns the value for FieldNumber type. It returns a
+// non-negative int32 value. Caller will still need to validate for the correct
+// field number range.
+func (t Token) FieldNumber() int32 {
+	if t.kind != Name || t.attrs&uint8(FieldNumber) == 0 {
+		panic(fmt.Sprintf("Token is not a FieldNumber: %s:%s", t.kind, NameKind(t.attrs&^hasSeparator)))
+	}
+	// Following should not return an error as it had already been called right
+	// before this Token was constructed.
+	num, _ := strconv.ParseInt(string(t.raw), 10, 32)
+	return int32(num)
+}
+
+// String returns the string value for a Scalar type.
+func (t Token) String() (string, bool) {
+	if t.kind != Scalar || t.attrs != stringValue {
+		return "", false
+	}
+	return t.str, true
+}
+
+// Enum returns the literal value for a Scalar type for use as enum literals.
+func (t Token) Enum() (string, bool) {
+	if t.kind != Scalar || t.attrs != literalValue || (len(t.raw) > 0 && t.raw[0] == '-') {
+		return "", false
+	}
+	return string(t.raw), true
+}
+
+// Bool returns the bool value for a Scalar type.
+func (t Token) Bool() (bool, bool) {
+	if t.kind != Scalar {
+		return false, false
+	}
+	switch t.attrs {
+	case literalValue:
+		if b, ok := boolLits[string(t.raw)]; ok {
+			return b, true
+		}
+	case numberValue:
+		// Unsigned integer representation of 0 or 1 is permitted: 00, 0x0, 01,
+		// 0x1, etc.
+		n, err := strconv.ParseUint(t.str, 0, 64)
+		if err == nil {
+			switch n {
+			case 0:
+				return false, true
+			case 1:
+				return true, true
+			}
+		}
+	}
+	return false, false
+}
+
+// These exact boolean literals are the ones supported in C++.
+var boolLits = map[string]bool{
+	"t":     true,
+	"true":  true,
+	"True":  true,
+	"f":     false,
+	"false": false,
+	"False": false,
+}
+
+// Uint64 returns the uint64 value for a Scalar type.
+func (t Token) Uint64() (uint64, bool) {
+	if t.kind != Scalar || t.attrs != numberValue ||
+		t.numAttrs&isNegative > 0 || t.numAttrs&numFloat > 0 {
+		return 0, false
+	}
+	n, err := strconv.ParseUint(t.str, 0, 64)
+	if err != nil {
+		return 0, false
+	}
+	return n, true
+}
+
+// Uint32 returns the uint32 value for a Scalar type.
+func (t Token) Uint32() (uint32, bool) {
+	if t.kind != Scalar || t.attrs != numberValue ||
+		t.numAttrs&isNegative > 0 || t.numAttrs&numFloat > 0 {
+		return 0, false
+	}
+	n, err := strconv.ParseUint(t.str, 0, 32)
+	if err != nil {
+		return 0, false
+	}
+	return uint32(n), true
+}
+
+// Int64 returns the int64 value for a Scalar type.
+func (t Token) Int64() (int64, bool) {
+	if t.kind != Scalar || t.attrs != numberValue || t.numAttrs&numFloat > 0 {
+		return 0, false
+	}
+	if n, err := strconv.ParseInt(t.str, 0, 64); err == nil {
+		return n, true
+	}
+	// C++ accepts large positive hex numbers as negative values.
+	// This feature is here for proto1 backwards compatibility purposes.
+	if flags.ProtoLegacy && (t.numAttrs == numHex) {
+		if n, err := strconv.ParseUint(t.str, 0, 64); err == nil {
+			return int64(n), true
+		}
+	}
+	return 0, false
+}
+
+// Int32 returns the int32 value for a Scalar type.
+func (t Token) Int32() (int32, bool) {
+	if t.kind != Scalar || t.attrs != numberValue || t.numAttrs&numFloat > 0 {
+		return 0, false
+	}
+	if n, err := strconv.ParseInt(t.str, 0, 32); err == nil {
+		return int32(n), true
+	}
+	// C++ accepts large positive hex numbers as negative values.
+	// This feature is here for proto1 backwards compatibility purposes.
+	if flags.ProtoLegacy && (t.numAttrs == numHex) {
+		if n, err := strconv.ParseUint(t.str, 0, 32); err == nil {
+			return int32(n), true
+		}
+	}
+	return 0, false
+}
+
+// Float64 returns the float64 value for a Scalar type.
+func (t Token) Float64() (float64, bool) {
+	if t.kind != Scalar {
+		return 0, false
+	}
+	switch t.attrs {
+	case literalValue:
+		if f, ok := floatLits[strings.ToLower(string(t.raw))]; ok {
+			return f, true
+		}
+	case numberValue:
+		n, err := strconv.ParseFloat(t.str, 64)
+		if err == nil {
+			return n, true
+		}
+		nerr := err.(*strconv.NumError)
+		if nerr.Err == strconv.ErrRange {
+			return n, true
+		}
+	}
+	return 0, false
+}
+
+// Float32 returns the float32 value for a Scalar type.
+func (t Token) Float32() (float32, bool) {
+	if t.kind != Scalar {
+		return 0, false
+	}
+	switch t.attrs {
+	case literalValue:
+		if f, ok := floatLits[strings.ToLower(string(t.raw))]; ok {
+			return float32(f), true
+		}
+	case numberValue:
+		n, err := strconv.ParseFloat(t.str, 64)
+		if err == nil {
+			// Overflows are treated as (-)infinity.
+			return float32(n), true
+		}
+		nerr := err.(*strconv.NumError)
+		if nerr.Err == strconv.ErrRange {
+			return float32(n), true
+		}
+	}
+	return 0, false
+}
+
+// These are the supported float literals which C++ permits case-insensitive
+// variants of these.
+var floatLits = map[string]float64{
+	"nan":       math.NaN(),
+	"inf":       math.Inf(1),
+	"infinity":  math.Inf(1),
+	"-inf":      math.Inf(-1),
+	"-infinity": math.Inf(-1),
+}
+
+// TokenEquals returns true if given Tokens are equal, else false.
+func TokenEquals(x, y Token) bool {
+	return x.kind == y.kind &&
+		x.attrs == y.attrs &&
+		x.numAttrs == y.numAttrs &&
+		x.pos == y.pos &&
+		bytes.Equal(x.raw, y.raw) &&
+		x.str == y.str
+}
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/doc.go b/vendor/google.golang.org/protobuf/internal/encoding/text/doc.go
new file mode 100644
index 0000000..0ce8d6f
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/doc.go
@@ -0,0 +1,29 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package text implements the text format for protocol buffers.
+// This package has no semantic understanding for protocol buffers and is only
+// a parser and composer for the format.
+//
+// There is no formal specification for the protobuf text format, as such the
+// C++ implementation (see google::protobuf::TextFormat) is the reference
+// implementation of the text format.
+//
+// This package is neither a superset nor a subset of the C++ implementation.
+// This implementation permits a more liberal grammar in some cases to be
+// backwards compatible with the historical Go implementation.
+// Future parsings unique to Go should not be added.
+// Some grammars allowed by the C++ implementation are deliberately
+// not implemented here because they are considered a bug by the protobuf team
+// and should not be replicated.
+//
+// The Go implementation should implement a sufficient amount of the C++
+// grammar such that the default text serialization by C++ can be parsed by Go.
+// However, just because the C++ parser accepts some input does not mean that
+// the Go implementation should as well.
+//
+// The text format is almost a superset of JSON except:
+//	* message keys are not quoted strings, but identifiers
+//	* the top-level value must be a message without the delimiters
+package text
diff --git a/vendor/google.golang.org/protobuf/internal/encoding/text/encode.go b/vendor/google.golang.org/protobuf/internal/encoding/text/encode.go
new file mode 100644
index 0000000..c4ba1c5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/encoding/text/encode.go
@@ -0,0 +1,267 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package text
+
+import (
+	"math"
+	"math/bits"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/internal/detrand"
+	"google.golang.org/protobuf/internal/errors"
+)
+
+// encType represents an encoding type.
+type encType uint8
+
+const (
+	_ encType = (1 << iota) / 2
+	name
+	scalar
+	messageOpen
+	messageClose
+)
+
+// Encoder provides methods to write out textproto constructs and values. The user is
+// responsible for producing valid sequences of constructs and values.
+type Encoder struct {
+	encoderState
+
+	indent      string
+	newline     string // set to "\n" if len(indent) > 0
+	delims      [2]byte
+	outputASCII bool
+}
+
+type encoderState struct {
+	lastType encType
+	indents  []byte
+	out      []byte
+}
+
+// NewEncoder returns an Encoder.
+//
+// If indent is a non-empty string, it causes every entry in a List or Message
+// to be preceded by the indent and trailed by a newline.
+//
+// If delims is not the zero value, it controls the delimiter characters used
+// for messages (e.g., "{}" vs "<>").
+//
+// If outputASCII is true, strings will be serialized in such a way that
+// multi-byte UTF-8 sequences are escaped. This property ensures that the
+// overall output is ASCII (as opposed to UTF-8).
+func NewEncoder(indent string, delims [2]byte, outputASCII bool) (*Encoder, error) {
+	e := &Encoder{}
+	if len(indent) > 0 {
+		if strings.Trim(indent, " \t") != "" {
+			return nil, errors.New("indent may only be composed of space and tab characters")
+		}
+		e.indent = indent
+		e.newline = "\n"
+	}
+	switch delims {
+	case [2]byte{0, 0}:
+		e.delims = [2]byte{'{', '}'}
+	case [2]byte{'{', '}'}, [2]byte{'<', '>'}:
+		e.delims = delims
+	default:
+		return nil, errors.New("delimiters may only be \"{}\" or \"<>\"")
+	}
+	e.outputASCII = outputASCII
+
+	return e, nil
+}
+
+// Bytes returns the content of the written bytes.
+func (e *Encoder) Bytes() []byte {
+	return e.out
+}
+
+// StartMessage writes out the '{' or '<' symbol.
+func (e *Encoder) StartMessage() {
+	e.prepareNext(messageOpen)
+	e.out = append(e.out, e.delims[0])
+}
+
+// EndMessage writes out the '}' or '>' symbol.
+func (e *Encoder) EndMessage() {
+	e.prepareNext(messageClose)
+	e.out = append(e.out, e.delims[1])
+}
+
+// WriteName writes out the field name and the separator ':'.
+func (e *Encoder) WriteName(s string) {
+	e.prepareNext(name)
+	e.out = append(e.out, s...)
+	e.out = append(e.out, ':')
+}
+
+// WriteBool writes out the given boolean value.
+func (e *Encoder) WriteBool(b bool) {
+	if b {
+		e.WriteLiteral("true")
+	} else {
+		e.WriteLiteral("false")
+	}
+}
+
+// WriteString writes out the given string value.
+func (e *Encoder) WriteString(s string) {
+	e.prepareNext(scalar)
+	e.out = appendString(e.out, s, e.outputASCII)
+}
+
+func appendString(out []byte, in string, outputASCII bool) []byte {
+	out = append(out, '"')
+	i := indexNeedEscapeInString(in)
+	in, out = in[i:], append(out, in[:i]...)
+	for len(in) > 0 {
+		switch r, n := utf8.DecodeRuneInString(in); {
+		case r == utf8.RuneError && n == 1:
+			// We do not report invalid UTF-8 because strings in the text format
+			// are used to represent both the proto string and bytes type.
+			r = rune(in[0])
+			fallthrough
+		case r < ' ' || r == '"' || r == '\\':
+			out = append(out, '\\')
+			switch r {
+			case '"', '\\':
+				out = append(out, byte(r))
+			case '\n':
+				out = append(out, 'n')
+			case '\r':
+				out = append(out, 'r')
+			case '\t':
+				out = append(out, 't')
+			default:
+				out = append(out, 'x')
+				out = append(out, "00"[1+(bits.Len32(uint32(r))-1)/4:]...)
+				out = strconv.AppendUint(out, uint64(r), 16)
+			}
+			in = in[n:]
+		case outputASCII && r >= utf8.RuneSelf:
+			out = append(out, '\\')
+			if r <= math.MaxUint16 {
+				out = append(out, 'u')
+				out = append(out, "0000"[1+(bits.Len32(uint32(r))-1)/4:]...)
+				out = strconv.AppendUint(out, uint64(r), 16)
+			} else {
+				out = append(out, 'U')
+				out = append(out, "00000000"[1+(bits.Len32(uint32(r))-1)/4:]...)
+				out = strconv.AppendUint(out, uint64(r), 16)
+			}
+			in = in[n:]
+		default:
+			i := indexNeedEscapeInString(in[n:])
+			in, out = in[n+i:], append(out, in[:n+i]...)
+		}
+	}
+	out = append(out, '"')
+	return out
+}
+
+// indexNeedEscapeInString returns the index of the character that needs
+// escaping. If no characters need escaping, this returns the input length.
+func indexNeedEscapeInString(s string) int {
+	for i := 0; i < len(s); i++ {
+		if c := s[i]; c < ' ' || c == '"' || c == '\'' || c == '\\' || c >= utf8.RuneSelf {
+			return i
+		}
+	}
+	return len(s)
+}
+
+// WriteFloat writes out the given float value for given bitSize.
+func (e *Encoder) WriteFloat(n float64, bitSize int) {
+	e.prepareNext(scalar)
+	e.out = appendFloat(e.out, n, bitSize)
+}
+
+func appendFloat(out []byte, n float64, bitSize int) []byte {
+	switch {
+	case math.IsNaN(n):
+		return append(out, "nan"...)
+	case math.IsInf(n, +1):
+		return append(out, "inf"...)
+	case math.IsInf(n, -1):
+		return append(out, "-inf"...)
+	default:
+		return strconv.AppendFloat(out, n, 'g', -1, bitSize)
+	}
+}
+
+// WriteInt writes out the given signed integer value.
+func (e *Encoder) WriteInt(n int64) {
+	e.prepareNext(scalar)
+	e.out = append(e.out, strconv.FormatInt(n, 10)...)
+}
+
+// WriteUint writes out the given unsigned integer value.
+func (e *Encoder) WriteUint(n uint64) {
+	e.prepareNext(scalar)
+	e.out = append(e.out, strconv.FormatUint(n, 10)...)
+}
+
+// WriteLiteral writes out the given string as a literal value without quotes.
+// This is used for writing enum literal strings.
+func (e *Encoder) WriteLiteral(s string) {
+	e.prepareNext(scalar)
+	e.out = append(e.out, s...)
+}
+
+// prepareNext adds possible space and indentation for the next value based
+// on last encType and indent option. It also updates e.lastType to next.
+func (e *Encoder) prepareNext(next encType) {
+	defer func() {
+		e.lastType = next
+	}()
+
+	// Single line.
+	if len(e.indent) == 0 {
+		// Add space after each field before the next one.
+		if e.lastType&(scalar|messageClose) != 0 && next == name {
+			e.out = append(e.out, ' ')
+			// Add a random extra space to make output unstable.
+			if detrand.Bool() {
+				e.out = append(e.out, ' ')
+			}
+		}
+		return
+	}
+
+	// Multi-line.
+	switch {
+	case e.lastType == name:
+		e.out = append(e.out, ' ')
+		// Add a random extra space after name: to make output unstable.
+		if detrand.Bool() {
+			e.out = append(e.out, ' ')
+		}
+
+	case e.lastType == messageOpen && next != messageClose:
+		e.indents = append(e.indents, e.indent...)
+		e.out = append(e.out, '\n')
+		e.out = append(e.out, e.indents...)
+
+	case e.lastType&(scalar|messageClose) != 0:
+		if next == messageClose {
+			e.indents = e.indents[:len(e.indents)-len(e.indent)]
+		}
+		e.out = append(e.out, '\n')
+		e.out = append(e.out, e.indents...)
+	}
+}
+
+// Snapshot returns the current snapshot for use in Reset.
+func (e *Encoder) Snapshot() encoderState {
+	return e.encoderState
+}
+
+// Reset resets the Encoder to the given encoderState from a Snapshot.
+func (e *Encoder) Reset(es encoderState) {
+	e.encoderState = es
+}
diff --git a/vendor/google.golang.org/protobuf/internal/errors/errors.go b/vendor/google.golang.org/protobuf/internal/errors/errors.go
new file mode 100644
index 0000000..20c17b3
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/errors/errors.go
@@ -0,0 +1,89 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package errors implements functions to manipulate errors.
+package errors
+
+import (
+	"errors"
+	"fmt"
+
+	"google.golang.org/protobuf/internal/detrand"
+)
+
+// Error is a sentinel matching all errors produced by this package.
+var Error = errors.New("protobuf error")
+
+// New formats a string according to the format specifier and arguments and
+// returns an error that has a "proto" prefix.
+func New(f string, x ...interface{}) error {
+	return &prefixError{s: format(f, x...)}
+}
+
+type prefixError struct{ s string }
+
+var prefix = func() string {
+	// Deliberately introduce instability into the error message string to
+	// discourage users from performing error string comparisons.
+	if detrand.Bool() {
+		return "proto: " // use non-breaking spaces (U+00a0)
+	} else {
+		return "proto: " // use regular spaces (U+0020)
+	}
+}()
+
+func (e *prefixError) Error() string {
+	return prefix + e.s
+}
+
+func (e *prefixError) Unwrap() error {
+	return Error
+}
+
+// Wrap returns an error that has a "proto" prefix, the formatted string described
+// by the format specifier and arguments, and a suffix of err. The error wraps err.
+func Wrap(err error, f string, x ...interface{}) error {
+	return &wrapError{
+		s:   format(f, x...),
+		err: err,
+	}
+}
+
+type wrapError struct {
+	s   string
+	err error
+}
+
+func (e *wrapError) Error() string {
+	return format("%v%v: %v", prefix, e.s, e.err)
+}
+
+func (e *wrapError) Unwrap() error {
+	return e.err
+}
+
+func (e *wrapError) Is(target error) bool {
+	return target == Error
+}
+
+func format(f string, x ...interface{}) string {
+	// avoid "proto: " prefix when chaining
+	for i := 0; i < len(x); i++ {
+		switch e := x[i].(type) {
+		case *prefixError:
+			x[i] = e.s
+		case *wrapError:
+			x[i] = format("%v: %v", e.s, e.err)
+		}
+	}
+	return fmt.Sprintf(f, x...)
+}
+
+func InvalidUTF8(name string) error {
+	return New("field %v contains invalid UTF-8", name)
+}
+
+func RequiredNotSet(name string) error {
+	return New("required field %v not set", name)
+}
diff --git a/vendor/google.golang.org/protobuf/internal/errors/is_go112.go b/vendor/google.golang.org/protobuf/internal/errors/is_go112.go
new file mode 100644
index 0000000..f90e909
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/errors/is_go112.go
@@ -0,0 +1,39 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.13
+
+package errors
+
+import "reflect"
+
+// Is is a copy of Go 1.13's errors.Is for use with older Go versions.
+func Is(err, target error) bool {
+	if target == nil {
+		return err == target
+	}
+
+	isComparable := reflect.TypeOf(target).Comparable()
+	for {
+		if isComparable && err == target {
+			return true
+		}
+		if x, ok := err.(interface{ Is(error) bool }); ok && x.Is(target) {
+			return true
+		}
+		if err = unwrap(err); err == nil {
+			return false
+		}
+	}
+}
+
+func unwrap(err error) error {
+	u, ok := err.(interface {
+		Unwrap() error
+	})
+	if !ok {
+		return nil
+	}
+	return u.Unwrap()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/errors/is_go113.go b/vendor/google.golang.org/protobuf/internal/errors/is_go113.go
new file mode 100644
index 0000000..dc05f41
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/errors/is_go113.go
@@ -0,0 +1,12 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.13
+
+package errors
+
+import "errors"
+
+// Is is errors.Is.
+func Is(err, target error) bool { return errors.Is(err, target) }
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/any_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/any_gen.go
new file mode 100644
index 0000000..74c5fef
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/any_gen.go
@@ -0,0 +1,13 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Any.
+const (
+	Any_TypeUrl = 1 // optional string
+	Any_Value   = 2 // optional bytes
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/api_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/api_gen.go
new file mode 100644
index 0000000..9a6b5f2
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/api_gen.go
@@ -0,0 +1,35 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Api.
+const (
+	Api_Name          = 1 // optional string
+	Api_Methods       = 2 // repeated google.protobuf.Method
+	Api_Options       = 3 // repeated google.protobuf.Option
+	Api_Version       = 4 // optional string
+	Api_SourceContext = 5 // optional google.protobuf.SourceContext
+	Api_Mixins        = 6 // repeated google.protobuf.Mixin
+	Api_Syntax        = 7 // optional google.protobuf.Syntax
+)
+
+// Field numbers for google.protobuf.Method.
+const (
+	Method_Name              = 1 // optional string
+	Method_RequestTypeUrl    = 2 // optional string
+	Method_RequestStreaming  = 3 // optional bool
+	Method_ResponseTypeUrl   = 4 // optional string
+	Method_ResponseStreaming = 5 // optional bool
+	Method_Options           = 6 // repeated google.protobuf.Option
+	Method_Syntax            = 7 // optional google.protobuf.Syntax
+)
+
+// Field numbers for google.protobuf.Mixin.
+const (
+	Mixin_Name = 1 // optional string
+	Mixin_Root = 2 // optional string
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/descriptor_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/descriptor_gen.go
new file mode 100644
index 0000000..6e37b59
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/descriptor_gen.go
@@ -0,0 +1,240 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.FileDescriptorSet.
+const (
+	FileDescriptorSet_File = 1 // repeated google.protobuf.FileDescriptorProto
+)
+
+// Field numbers for google.protobuf.FileDescriptorProto.
+const (
+	FileDescriptorProto_Name             = 1  // optional string
+	FileDescriptorProto_Package          = 2  // optional string
+	FileDescriptorProto_Dependency       = 3  // repeated string
+	FileDescriptorProto_PublicDependency = 10 // repeated int32
+	FileDescriptorProto_WeakDependency   = 11 // repeated int32
+	FileDescriptorProto_MessageType      = 4  // repeated google.protobuf.DescriptorProto
+	FileDescriptorProto_EnumType         = 5  // repeated google.protobuf.EnumDescriptorProto
+	FileDescriptorProto_Service          = 6  // repeated google.protobuf.ServiceDescriptorProto
+	FileDescriptorProto_Extension        = 7  // repeated google.protobuf.FieldDescriptorProto
+	FileDescriptorProto_Options          = 8  // optional google.protobuf.FileOptions
+	FileDescriptorProto_SourceCodeInfo   = 9  // optional google.protobuf.SourceCodeInfo
+	FileDescriptorProto_Syntax           = 12 // optional string
+)
+
+// Field numbers for google.protobuf.DescriptorProto.
+const (
+	DescriptorProto_Name           = 1  // optional string
+	DescriptorProto_Field          = 2  // repeated google.protobuf.FieldDescriptorProto
+	DescriptorProto_Extension      = 6  // repeated google.protobuf.FieldDescriptorProto
+	DescriptorProto_NestedType     = 3  // repeated google.protobuf.DescriptorProto
+	DescriptorProto_EnumType       = 4  // repeated google.protobuf.EnumDescriptorProto
+	DescriptorProto_ExtensionRange = 5  // repeated google.protobuf.DescriptorProto.ExtensionRange
+	DescriptorProto_OneofDecl      = 8  // repeated google.protobuf.OneofDescriptorProto
+	DescriptorProto_Options        = 7  // optional google.protobuf.MessageOptions
+	DescriptorProto_ReservedRange  = 9  // repeated google.protobuf.DescriptorProto.ReservedRange
+	DescriptorProto_ReservedName   = 10 // repeated string
+)
+
+// Field numbers for google.protobuf.DescriptorProto.ExtensionRange.
+const (
+	DescriptorProto_ExtensionRange_Start   = 1 // optional int32
+	DescriptorProto_ExtensionRange_End     = 2 // optional int32
+	DescriptorProto_ExtensionRange_Options = 3 // optional google.protobuf.ExtensionRangeOptions
+)
+
+// Field numbers for google.protobuf.DescriptorProto.ReservedRange.
+const (
+	DescriptorProto_ReservedRange_Start = 1 // optional int32
+	DescriptorProto_ReservedRange_End   = 2 // optional int32
+)
+
+// Field numbers for google.protobuf.ExtensionRangeOptions.
+const (
+	ExtensionRangeOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.FieldDescriptorProto.
+const (
+	FieldDescriptorProto_Name           = 1  // optional string
+	FieldDescriptorProto_Number         = 3  // optional int32
+	FieldDescriptorProto_Label          = 4  // optional google.protobuf.FieldDescriptorProto.Label
+	FieldDescriptorProto_Type           = 5  // optional google.protobuf.FieldDescriptorProto.Type
+	FieldDescriptorProto_TypeName       = 6  // optional string
+	FieldDescriptorProto_Extendee       = 2  // optional string
+	FieldDescriptorProto_DefaultValue   = 7  // optional string
+	FieldDescriptorProto_OneofIndex     = 9  // optional int32
+	FieldDescriptorProto_JsonName       = 10 // optional string
+	FieldDescriptorProto_Options        = 8  // optional google.protobuf.FieldOptions
+	FieldDescriptorProto_Proto3Optional = 17 // optional bool
+)
+
+// Field numbers for google.protobuf.OneofDescriptorProto.
+const (
+	OneofDescriptorProto_Name    = 1 // optional string
+	OneofDescriptorProto_Options = 2 // optional google.protobuf.OneofOptions
+)
+
+// Field numbers for google.protobuf.EnumDescriptorProto.
+const (
+	EnumDescriptorProto_Name          = 1 // optional string
+	EnumDescriptorProto_Value         = 2 // repeated google.protobuf.EnumValueDescriptorProto
+	EnumDescriptorProto_Options       = 3 // optional google.protobuf.EnumOptions
+	EnumDescriptorProto_ReservedRange = 4 // repeated google.protobuf.EnumDescriptorProto.EnumReservedRange
+	EnumDescriptorProto_ReservedName  = 5 // repeated string
+)
+
+// Field numbers for google.protobuf.EnumDescriptorProto.EnumReservedRange.
+const (
+	EnumDescriptorProto_EnumReservedRange_Start = 1 // optional int32
+	EnumDescriptorProto_EnumReservedRange_End   = 2 // optional int32
+)
+
+// Field numbers for google.protobuf.EnumValueDescriptorProto.
+const (
+	EnumValueDescriptorProto_Name    = 1 // optional string
+	EnumValueDescriptorProto_Number  = 2 // optional int32
+	EnumValueDescriptorProto_Options = 3 // optional google.protobuf.EnumValueOptions
+)
+
+// Field numbers for google.protobuf.ServiceDescriptorProto.
+const (
+	ServiceDescriptorProto_Name    = 1 // optional string
+	ServiceDescriptorProto_Method  = 2 // repeated google.protobuf.MethodDescriptorProto
+	ServiceDescriptorProto_Options = 3 // optional google.protobuf.ServiceOptions
+)
+
+// Field numbers for google.protobuf.MethodDescriptorProto.
+const (
+	MethodDescriptorProto_Name            = 1 // optional string
+	MethodDescriptorProto_InputType       = 2 // optional string
+	MethodDescriptorProto_OutputType      = 3 // optional string
+	MethodDescriptorProto_Options         = 4 // optional google.protobuf.MethodOptions
+	MethodDescriptorProto_ClientStreaming = 5 // optional bool
+	MethodDescriptorProto_ServerStreaming = 6 // optional bool
+)
+
+// Field numbers for google.protobuf.FileOptions.
+const (
+	FileOptions_JavaPackage               = 1   // optional string
+	FileOptions_JavaOuterClassname        = 8   // optional string
+	FileOptions_JavaMultipleFiles         = 10  // optional bool
+	FileOptions_JavaGenerateEqualsAndHash = 20  // optional bool
+	FileOptions_JavaStringCheckUtf8       = 27  // optional bool
+	FileOptions_OptimizeFor               = 9   // optional google.protobuf.FileOptions.OptimizeMode
+	FileOptions_GoPackage                 = 11  // optional string
+	FileOptions_CcGenericServices         = 16  // optional bool
+	FileOptions_JavaGenericServices       = 17  // optional bool
+	FileOptions_PyGenericServices         = 18  // optional bool
+	FileOptions_PhpGenericServices        = 42  // optional bool
+	FileOptions_Deprecated                = 23  // optional bool
+	FileOptions_CcEnableArenas            = 31  // optional bool
+	FileOptions_ObjcClassPrefix           = 36  // optional string
+	FileOptions_CsharpNamespace           = 37  // optional string
+	FileOptions_SwiftPrefix               = 39  // optional string
+	FileOptions_PhpClassPrefix            = 40  // optional string
+	FileOptions_PhpNamespace              = 41  // optional string
+	FileOptions_PhpMetadataNamespace      = 44  // optional string
+	FileOptions_RubyPackage               = 45  // optional string
+	FileOptions_UninterpretedOption       = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.MessageOptions.
+const (
+	MessageOptions_MessageSetWireFormat         = 1   // optional bool
+	MessageOptions_NoStandardDescriptorAccessor = 2   // optional bool
+	MessageOptions_Deprecated                   = 3   // optional bool
+	MessageOptions_MapEntry                     = 7   // optional bool
+	MessageOptions_UninterpretedOption          = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.FieldOptions.
+const (
+	FieldOptions_Ctype               = 1   // optional google.protobuf.FieldOptions.CType
+	FieldOptions_Packed              = 2   // optional bool
+	FieldOptions_Jstype              = 6   // optional google.protobuf.FieldOptions.JSType
+	FieldOptions_Lazy                = 5   // optional bool
+	FieldOptions_Deprecated          = 3   // optional bool
+	FieldOptions_Weak                = 10  // optional bool
+	FieldOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.OneofOptions.
+const (
+	OneofOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.EnumOptions.
+const (
+	EnumOptions_AllowAlias          = 2   // optional bool
+	EnumOptions_Deprecated          = 3   // optional bool
+	EnumOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.EnumValueOptions.
+const (
+	EnumValueOptions_Deprecated          = 1   // optional bool
+	EnumValueOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.ServiceOptions.
+const (
+	ServiceOptions_Deprecated          = 33  // optional bool
+	ServiceOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.MethodOptions.
+const (
+	MethodOptions_Deprecated          = 33  // optional bool
+	MethodOptions_IdempotencyLevel    = 34  // optional google.protobuf.MethodOptions.IdempotencyLevel
+	MethodOptions_UninterpretedOption = 999 // repeated google.protobuf.UninterpretedOption
+)
+
+// Field numbers for google.protobuf.UninterpretedOption.
+const (
+	UninterpretedOption_Name             = 2 // repeated google.protobuf.UninterpretedOption.NamePart
+	UninterpretedOption_IdentifierValue  = 3 // optional string
+	UninterpretedOption_PositiveIntValue = 4 // optional uint64
+	UninterpretedOption_NegativeIntValue = 5 // optional int64
+	UninterpretedOption_DoubleValue      = 6 // optional double
+	UninterpretedOption_StringValue      = 7 // optional bytes
+	UninterpretedOption_AggregateValue   = 8 // optional string
+)
+
+// Field numbers for google.protobuf.UninterpretedOption.NamePart.
+const (
+	UninterpretedOption_NamePart_NamePart    = 1 // required string
+	UninterpretedOption_NamePart_IsExtension = 2 // required bool
+)
+
+// Field numbers for google.protobuf.SourceCodeInfo.
+const (
+	SourceCodeInfo_Location = 1 // repeated google.protobuf.SourceCodeInfo.Location
+)
+
+// Field numbers for google.protobuf.SourceCodeInfo.Location.
+const (
+	SourceCodeInfo_Location_Path                    = 1 // repeated int32
+	SourceCodeInfo_Location_Span                    = 2 // repeated int32
+	SourceCodeInfo_Location_LeadingComments         = 3 // optional string
+	SourceCodeInfo_Location_TrailingComments        = 4 // optional string
+	SourceCodeInfo_Location_LeadingDetachedComments = 6 // repeated string
+)
+
+// Field numbers for google.protobuf.GeneratedCodeInfo.
+const (
+	GeneratedCodeInfo_Annotation = 1 // repeated google.protobuf.GeneratedCodeInfo.Annotation
+)
+
+// Field numbers for google.protobuf.GeneratedCodeInfo.Annotation.
+const (
+	GeneratedCodeInfo_Annotation_Path       = 1 // repeated int32
+	GeneratedCodeInfo_Annotation_SourceFile = 2 // optional string
+	GeneratedCodeInfo_Annotation_Begin      = 3 // optional int32
+	GeneratedCodeInfo_Annotation_End        = 4 // optional int32
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/doc.go b/vendor/google.golang.org/protobuf/internal/fieldnum/doc.go
new file mode 100644
index 0000000..e597885
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/doc.go
@@ -0,0 +1,7 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package fieldnum contains constants for field numbers of fields in messages
+// declared in descriptor.proto and any of the well-known types.
+package fieldnum
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/duration_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/duration_gen.go
new file mode 100644
index 0000000..8816c73
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/duration_gen.go
@@ -0,0 +1,13 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Duration.
+const (
+	Duration_Seconds = 1 // optional int64
+	Duration_Nanos   = 2 // optional int32
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/empty_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/empty_gen.go
new file mode 100644
index 0000000..b5130a6
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/empty_gen.go
@@ -0,0 +1,10 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Empty.
+const ()
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/field_mask_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/field_mask_gen.go
new file mode 100644
index 0000000..7e3bfa2
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/field_mask_gen.go
@@ -0,0 +1,12 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.FieldMask.
+const (
+	FieldMask_Paths = 1 // repeated string
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/source_context_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/source_context_gen.go
new file mode 100644
index 0000000..241972b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/source_context_gen.go
@@ -0,0 +1,12 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.SourceContext.
+const (
+	SourceContext_FileName = 1 // optional string
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/struct_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/struct_gen.go
new file mode 100644
index 0000000..c460aab
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/struct_gen.go
@@ -0,0 +1,33 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Struct.
+const (
+	Struct_Fields = 1 // repeated google.protobuf.Struct.FieldsEntry
+)
+
+// Field numbers for google.protobuf.Struct.FieldsEntry.
+const (
+	Struct_FieldsEntry_Key   = 1 // optional string
+	Struct_FieldsEntry_Value = 2 // optional google.protobuf.Value
+)
+
+// Field numbers for google.protobuf.Value.
+const (
+	Value_NullValue   = 1 // optional google.protobuf.NullValue
+	Value_NumberValue = 2 // optional double
+	Value_StringValue = 3 // optional string
+	Value_BoolValue   = 4 // optional bool
+	Value_StructValue = 5 // optional google.protobuf.Struct
+	Value_ListValue   = 6 // optional google.protobuf.ListValue
+)
+
+// Field numbers for google.protobuf.ListValue.
+const (
+	ListValue_Values = 1 // repeated google.protobuf.Value
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/timestamp_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/timestamp_gen.go
new file mode 100644
index 0000000..b4346fb
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/timestamp_gen.go
@@ -0,0 +1,13 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Timestamp.
+const (
+	Timestamp_Seconds = 1 // optional int64
+	Timestamp_Nanos   = 2 // optional int32
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/type_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/type_gen.go
new file mode 100644
index 0000000..b392e95
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/type_gen.go
@@ -0,0 +1,53 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.Type.
+const (
+	Type_Name          = 1 // optional string
+	Type_Fields        = 2 // repeated google.protobuf.Field
+	Type_Oneofs        = 3 // repeated string
+	Type_Options       = 4 // repeated google.protobuf.Option
+	Type_SourceContext = 5 // optional google.protobuf.SourceContext
+	Type_Syntax        = 6 // optional google.protobuf.Syntax
+)
+
+// Field numbers for google.protobuf.Field.
+const (
+	Field_Kind         = 1  // optional google.protobuf.Field.Kind
+	Field_Cardinality  = 2  // optional google.protobuf.Field.Cardinality
+	Field_Number       = 3  // optional int32
+	Field_Name         = 4  // optional string
+	Field_TypeUrl      = 6  // optional string
+	Field_OneofIndex   = 7  // optional int32
+	Field_Packed       = 8  // optional bool
+	Field_Options      = 9  // repeated google.protobuf.Option
+	Field_JsonName     = 10 // optional string
+	Field_DefaultValue = 11 // optional string
+)
+
+// Field numbers for google.protobuf.Enum.
+const (
+	Enum_Name          = 1 // optional string
+	Enum_Enumvalue     = 2 // repeated google.protobuf.EnumValue
+	Enum_Options       = 3 // repeated google.protobuf.Option
+	Enum_SourceContext = 4 // optional google.protobuf.SourceContext
+	Enum_Syntax        = 5 // optional google.protobuf.Syntax
+)
+
+// Field numbers for google.protobuf.EnumValue.
+const (
+	EnumValue_Name    = 1 // optional string
+	EnumValue_Number  = 2 // optional int32
+	EnumValue_Options = 3 // repeated google.protobuf.Option
+)
+
+// Field numbers for google.protobuf.Option.
+const (
+	Option_Name  = 1 // optional string
+	Option_Value = 2 // optional google.protobuf.Any
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldnum/wrappers_gen.go b/vendor/google.golang.org/protobuf/internal/fieldnum/wrappers_gen.go
new file mode 100644
index 0000000..42f846a
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldnum/wrappers_gen.go
@@ -0,0 +1,52 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-protos. DO NOT EDIT.
+
+package fieldnum
+
+// Field numbers for google.protobuf.DoubleValue.
+const (
+	DoubleValue_Value = 1 // optional double
+)
+
+// Field numbers for google.protobuf.FloatValue.
+const (
+	FloatValue_Value = 1 // optional float
+)
+
+// Field numbers for google.protobuf.Int64Value.
+const (
+	Int64Value_Value = 1 // optional int64
+)
+
+// Field numbers for google.protobuf.UInt64Value.
+const (
+	UInt64Value_Value = 1 // optional uint64
+)
+
+// Field numbers for google.protobuf.Int32Value.
+const (
+	Int32Value_Value = 1 // optional int32
+)
+
+// Field numbers for google.protobuf.UInt32Value.
+const (
+	UInt32Value_Value = 1 // optional uint32
+)
+
+// Field numbers for google.protobuf.BoolValue.
+const (
+	BoolValue_Value = 1 // optional bool
+)
+
+// Field numbers for google.protobuf.StringValue.
+const (
+	StringValue_Value = 1 // optional string
+)
+
+// Field numbers for google.protobuf.BytesValue.
+const (
+	BytesValue_Value = 1 // optional bytes
+)
diff --git a/vendor/google.golang.org/protobuf/internal/fieldsort/fieldsort.go b/vendor/google.golang.org/protobuf/internal/fieldsort/fieldsort.go
new file mode 100644
index 0000000..517c4e2
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/fieldsort/fieldsort.go
@@ -0,0 +1,40 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package fieldsort defines an ordering of fields.
+//
+// The ordering defined by this package matches the historic behavior of the proto
+// package, placing extensions first and oneofs last.
+//
+// There is no guarantee about stability of the wire encoding, and users should not
+// depend on the order defined in this package as it is subject to change without
+// notice.
+package fieldsort
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Less returns true if field a comes before field j in ordered wire marshal output.
+func Less(a, b protoreflect.FieldDescriptor) bool {
+	ea := a.IsExtension()
+	eb := b.IsExtension()
+	oa := a.ContainingOneof()
+	ob := b.ContainingOneof()
+	switch {
+	case ea != eb:
+		return ea
+	case oa != nil && ob != nil:
+		if oa == ob {
+			return a.Number() < b.Number()
+		}
+		return oa.Index() < ob.Index()
+	case oa != nil && !oa.IsSynthetic():
+		return false
+	case ob != nil && !ob.IsSynthetic():
+		return true
+	default:
+		return a.Number() < b.Number()
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/build.go b/vendor/google.golang.org/protobuf/internal/filedesc/build.go
new file mode 100644
index 0000000..462d384
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/build.go
@@ -0,0 +1,155 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package filedesc provides functionality for constructing descriptors.
+package filedesc
+
+import (
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/fieldnum"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// Builder construct a protoreflect.FileDescriptor from the raw descriptor.
+type Builder struct {
+	// GoPackagePath is the Go package path that is invoking this builder.
+	GoPackagePath string
+
+	// RawDescriptor is the wire-encoded bytes of FileDescriptorProto
+	// and must be populated.
+	RawDescriptor []byte
+
+	// NumEnums is the total number of enums declared in the file.
+	NumEnums int32
+	// NumMessages is the total number of messages declared in the file.
+	// It includes the implicit message declarations for map entries.
+	NumMessages int32
+	// NumExtensions is the total number of extensions declared in the file.
+	NumExtensions int32
+	// NumServices is the total number of services declared in the file.
+	NumServices int32
+
+	// TypeResolver resolves extension field types for descriptor options.
+	// If nil, it uses protoregistry.GlobalTypes.
+	TypeResolver interface {
+		preg.ExtensionTypeResolver
+	}
+
+	// FileRegistry is use to lookup file, enum, and message dependencies.
+	// Once constructed, the file descriptor is registered here.
+	// If nil, it uses protoregistry.GlobalFiles.
+	FileRegistry interface {
+		FindFileByPath(string) (protoreflect.FileDescriptor, error)
+		FindDescriptorByName(pref.FullName) (pref.Descriptor, error)
+		RegisterFile(pref.FileDescriptor) error
+	}
+}
+
+// resolverByIndex is an interface Builder.FileRegistry may implement.
+// If so, it permits looking up an enum or message dependency based on the
+// sub-list and element index into filetype.Builder.DependencyIndexes.
+type resolverByIndex interface {
+	FindEnumByIndex(int32, int32, []Enum, []Message) pref.EnumDescriptor
+	FindMessageByIndex(int32, int32, []Enum, []Message) pref.MessageDescriptor
+}
+
+// Indexes of each sub-list in filetype.Builder.DependencyIndexes.
+const (
+	listFieldDeps int32 = iota
+	listExtTargets
+	listExtDeps
+	listMethInDeps
+	listMethOutDeps
+)
+
+// Out is the output of the Builder.
+type Out struct {
+	File pref.FileDescriptor
+
+	// Enums is all enum descriptors in "flattened ordering".
+	Enums []Enum
+	// Messages is all message descriptors in "flattened ordering".
+	// It includes the implicit message declarations for map entries.
+	Messages []Message
+	// Extensions is all extension descriptors in "flattened ordering".
+	Extensions []Extension
+	// Service is all service descriptors in "flattened ordering".
+	Services []Service
+}
+
+// Build constructs a FileDescriptor given the parameters set in Builder.
+// It assumes that the inputs are well-formed and panics if any inconsistencies
+// are encountered.
+//
+// If NumEnums+NumMessages+NumExtensions+NumServices is zero,
+// then Build automatically derives them from the raw descriptor.
+func (db Builder) Build() (out Out) {
+	// Populate the counts if uninitialized.
+	if db.NumEnums+db.NumMessages+db.NumExtensions+db.NumServices == 0 {
+		db.unmarshalCounts(db.RawDescriptor, true)
+	}
+
+	// Initialize resolvers and registries if unpopulated.
+	if db.TypeResolver == nil {
+		db.TypeResolver = preg.GlobalTypes
+	}
+	if db.FileRegistry == nil {
+		db.FileRegistry = preg.GlobalFiles
+	}
+
+	fd := newRawFile(db)
+	out.File = fd
+	out.Enums = fd.allEnums
+	out.Messages = fd.allMessages
+	out.Extensions = fd.allExtensions
+	out.Services = fd.allServices
+
+	if err := db.FileRegistry.RegisterFile(fd); err != nil {
+		panic(err)
+	}
+	return out
+}
+
+// unmarshalCounts counts the number of enum, message, extension, and service
+// declarations in the raw message, which is either a FileDescriptorProto
+// or a MessageDescriptorProto depending on whether isFile is set.
+func (db *Builder) unmarshalCounts(b []byte, isFile bool) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			if isFile {
+				switch num {
+				case fieldnum.FileDescriptorProto_EnumType:
+					db.NumEnums++
+				case fieldnum.FileDescriptorProto_MessageType:
+					db.unmarshalCounts(v, false)
+					db.NumMessages++
+				case fieldnum.FileDescriptorProto_Extension:
+					db.NumExtensions++
+				case fieldnum.FileDescriptorProto_Service:
+					db.NumServices++
+				}
+			} else {
+				switch num {
+				case fieldnum.DescriptorProto_EnumType:
+					db.NumEnums++
+				case fieldnum.DescriptorProto_NestedType:
+					db.unmarshalCounts(v, false)
+					db.NumMessages++
+				case fieldnum.DescriptorProto_Extension:
+					db.NumExtensions++
+				}
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/desc.go b/vendor/google.golang.org/protobuf/internal/filedesc/desc.go
new file mode 100644
index 0000000..2540bef
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/desc.go
@@ -0,0 +1,613 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filedesc
+
+import (
+	"bytes"
+	"fmt"
+	"sync"
+	"sync/atomic"
+
+	"google.golang.org/protobuf/internal/descfmt"
+	"google.golang.org/protobuf/internal/descopts"
+	"google.golang.org/protobuf/internal/encoding/defval"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// The types in this file may have a suffix:
+//	• L0: Contains fields common to all descriptors (except File) and
+//	must be initialized up front.
+//	• L1: Contains fields specific to a descriptor and
+//	must be initialized up front.
+//	• L2: Contains fields that are lazily initialized when constructing
+//	from the raw file descriptor. When constructing as a literal, the L2
+//	fields must be initialized up front.
+//
+// The types are exported so that packages like reflect/protodesc can
+// directly construct descriptors.
+
+type (
+	File struct {
+		fileRaw
+		L1 FileL1
+
+		once uint32     // atomically set if L2 is valid
+		mu   sync.Mutex // protects L2
+		L2   *FileL2
+	}
+	FileL1 struct {
+		Syntax  pref.Syntax
+		Path    string
+		Package pref.FullName
+
+		Enums      Enums
+		Messages   Messages
+		Extensions Extensions
+		Services   Services
+	}
+	FileL2 struct {
+		Options   func() pref.ProtoMessage
+		Imports   FileImports
+		Locations SourceLocations
+	}
+)
+
+func (fd *File) ParentFile() pref.FileDescriptor { return fd }
+func (fd *File) Parent() pref.Descriptor         { return nil }
+func (fd *File) Index() int                      { return 0 }
+func (fd *File) Syntax() pref.Syntax             { return fd.L1.Syntax }
+func (fd *File) Name() pref.Name                 { return fd.L1.Package.Name() }
+func (fd *File) FullName() pref.FullName         { return fd.L1.Package }
+func (fd *File) IsPlaceholder() bool             { return false }
+func (fd *File) Options() pref.ProtoMessage {
+	if f := fd.lazyInit().Options; f != nil {
+		return f()
+	}
+	return descopts.File
+}
+func (fd *File) Path() string                          { return fd.L1.Path }
+func (fd *File) Package() pref.FullName                { return fd.L1.Package }
+func (fd *File) Imports() pref.FileImports             { return &fd.lazyInit().Imports }
+func (fd *File) Enums() pref.EnumDescriptors           { return &fd.L1.Enums }
+func (fd *File) Messages() pref.MessageDescriptors     { return &fd.L1.Messages }
+func (fd *File) Extensions() pref.ExtensionDescriptors { return &fd.L1.Extensions }
+func (fd *File) Services() pref.ServiceDescriptors     { return &fd.L1.Services }
+func (fd *File) SourceLocations() pref.SourceLocations { return &fd.lazyInit().Locations }
+func (fd *File) Format(s fmt.State, r rune)            { descfmt.FormatDesc(s, r, fd) }
+func (fd *File) ProtoType(pref.FileDescriptor)         {}
+func (fd *File) ProtoInternal(pragma.DoNotImplement)   {}
+
+func (fd *File) lazyInit() *FileL2 {
+	if atomic.LoadUint32(&fd.once) == 0 {
+		fd.lazyInitOnce()
+	}
+	return fd.L2
+}
+
+func (fd *File) lazyInitOnce() {
+	fd.mu.Lock()
+	if fd.L2 == nil {
+		fd.lazyRawInit() // recursively initializes all L2 structures
+	}
+	atomic.StoreUint32(&fd.once, 1)
+	fd.mu.Unlock()
+}
+
+// ProtoLegacyRawDesc is a pseudo-internal API for allowing the v1 code
+// to be able to retrieve the raw descriptor.
+//
+// WARNING: This method is exempt from the compatibility promise and may be
+// removed in the future without warning.
+func (fd *File) ProtoLegacyRawDesc() []byte {
+	return fd.builder.RawDescriptor
+}
+
+// GoPackagePath is a pseudo-internal API for determining the Go package path
+// that this file descriptor is declared in.
+//
+// WARNING: This method is exempt from the compatibility promise and may be
+// removed in the future without warning.
+func (fd *File) GoPackagePath() string {
+	return fd.builder.GoPackagePath
+}
+
+type (
+	Enum struct {
+		Base
+		L1 EnumL1
+		L2 *EnumL2 // protected by fileDesc.once
+	}
+	EnumL1 struct {
+		eagerValues bool // controls whether EnumL2.Values is already populated
+	}
+	EnumL2 struct {
+		Options        func() pref.ProtoMessage
+		Values         EnumValues
+		ReservedNames  Names
+		ReservedRanges EnumRanges
+	}
+
+	EnumValue struct {
+		Base
+		L1 EnumValueL1
+	}
+	EnumValueL1 struct {
+		Options func() pref.ProtoMessage
+		Number  pref.EnumNumber
+	}
+)
+
+func (ed *Enum) Options() pref.ProtoMessage {
+	if f := ed.lazyInit().Options; f != nil {
+		return f()
+	}
+	return descopts.Enum
+}
+func (ed *Enum) Values() pref.EnumValueDescriptors {
+	if ed.L1.eagerValues {
+		return &ed.L2.Values
+	}
+	return &ed.lazyInit().Values
+}
+func (ed *Enum) ReservedNames() pref.Names       { return &ed.lazyInit().ReservedNames }
+func (ed *Enum) ReservedRanges() pref.EnumRanges { return &ed.lazyInit().ReservedRanges }
+func (ed *Enum) Format(s fmt.State, r rune)      { descfmt.FormatDesc(s, r, ed) }
+func (ed *Enum) ProtoType(pref.EnumDescriptor)   {}
+func (ed *Enum) lazyInit() *EnumL2 {
+	ed.L0.ParentFile.lazyInit() // implicitly initializes L2
+	return ed.L2
+}
+
+func (ed *EnumValue) Options() pref.ProtoMessage {
+	if f := ed.L1.Options; f != nil {
+		return f()
+	}
+	return descopts.EnumValue
+}
+func (ed *EnumValue) Number() pref.EnumNumber            { return ed.L1.Number }
+func (ed *EnumValue) Format(s fmt.State, r rune)         { descfmt.FormatDesc(s, r, ed) }
+func (ed *EnumValue) ProtoType(pref.EnumValueDescriptor) {}
+
+type (
+	Message struct {
+		Base
+		L1 MessageL1
+		L2 *MessageL2 // protected by fileDesc.once
+	}
+	MessageL1 struct {
+		Enums        Enums
+		Messages     Messages
+		Extensions   Extensions
+		IsMapEntry   bool // promoted from google.protobuf.MessageOptions
+		IsMessageSet bool // promoted from google.protobuf.MessageOptions
+	}
+	MessageL2 struct {
+		Options               func() pref.ProtoMessage
+		Fields                Fields
+		Oneofs                Oneofs
+		ReservedNames         Names
+		ReservedRanges        FieldRanges
+		RequiredNumbers       FieldNumbers // must be consistent with Fields.Cardinality
+		ExtensionRanges       FieldRanges
+		ExtensionRangeOptions []func() pref.ProtoMessage // must be same length as ExtensionRanges
+	}
+
+	Field struct {
+		Base
+		L1 FieldL1
+	}
+	FieldL1 struct {
+		Options          func() pref.ProtoMessage
+		Number           pref.FieldNumber
+		Cardinality      pref.Cardinality // must be consistent with Message.RequiredNumbers
+		Kind             pref.Kind
+		JSONName         jsonName
+		IsProto3Optional bool // promoted from google.protobuf.FieldDescriptorProto
+		IsWeak           bool // promoted from google.protobuf.FieldOptions
+		HasPacked        bool // promoted from google.protobuf.FieldOptions
+		IsPacked         bool // promoted from google.protobuf.FieldOptions
+		HasEnforceUTF8   bool // promoted from google.protobuf.FieldOptions
+		EnforceUTF8      bool // promoted from google.protobuf.FieldOptions
+		Default          defaultValue
+		ContainingOneof  pref.OneofDescriptor // must be consistent with Message.Oneofs.Fields
+		Enum             pref.EnumDescriptor
+		Message          pref.MessageDescriptor
+	}
+
+	Oneof struct {
+		Base
+		L1 OneofL1
+	}
+	OneofL1 struct {
+		Options func() pref.ProtoMessage
+		Fields  OneofFields // must be consistent with Message.Fields.ContainingOneof
+	}
+)
+
+func (md *Message) Options() pref.ProtoMessage {
+	if f := md.lazyInit().Options; f != nil {
+		return f()
+	}
+	return descopts.Message
+}
+func (md *Message) IsMapEntry() bool                   { return md.L1.IsMapEntry }
+func (md *Message) Fields() pref.FieldDescriptors      { return &md.lazyInit().Fields }
+func (md *Message) Oneofs() pref.OneofDescriptors      { return &md.lazyInit().Oneofs }
+func (md *Message) ReservedNames() pref.Names          { return &md.lazyInit().ReservedNames }
+func (md *Message) ReservedRanges() pref.FieldRanges   { return &md.lazyInit().ReservedRanges }
+func (md *Message) RequiredNumbers() pref.FieldNumbers { return &md.lazyInit().RequiredNumbers }
+func (md *Message) ExtensionRanges() pref.FieldRanges  { return &md.lazyInit().ExtensionRanges }
+func (md *Message) ExtensionRangeOptions(i int) pref.ProtoMessage {
+	if f := md.lazyInit().ExtensionRangeOptions[i]; f != nil {
+		return f()
+	}
+	return descopts.ExtensionRange
+}
+func (md *Message) Enums() pref.EnumDescriptors           { return &md.L1.Enums }
+func (md *Message) Messages() pref.MessageDescriptors     { return &md.L1.Messages }
+func (md *Message) Extensions() pref.ExtensionDescriptors { return &md.L1.Extensions }
+func (md *Message) ProtoType(pref.MessageDescriptor)      {}
+func (md *Message) Format(s fmt.State, r rune)            { descfmt.FormatDesc(s, r, md) }
+func (md *Message) lazyInit() *MessageL2 {
+	md.L0.ParentFile.lazyInit() // implicitly initializes L2
+	return md.L2
+}
+
+// IsMessageSet is a pseudo-internal API for checking whether a message
+// should serialize in the proto1 message format.
+//
+// WARNING: This method is exempt from the compatibility promise and may be
+// removed in the future without warning.
+func (md *Message) IsMessageSet() bool {
+	return md.L1.IsMessageSet
+}
+
+func (fd *Field) Options() pref.ProtoMessage {
+	if f := fd.L1.Options; f != nil {
+		return f()
+	}
+	return descopts.Field
+}
+func (fd *Field) Number() pref.FieldNumber      { return fd.L1.Number }
+func (fd *Field) Cardinality() pref.Cardinality { return fd.L1.Cardinality }
+func (fd *Field) Kind() pref.Kind               { return fd.L1.Kind }
+func (fd *Field) HasJSONName() bool             { return fd.L1.JSONName.has }
+func (fd *Field) JSONName() string              { return fd.L1.JSONName.get(fd) }
+func (fd *Field) HasPresence() bool {
+	return fd.L1.Cardinality != pref.Repeated && (fd.L0.ParentFile.L1.Syntax == pref.Proto2 || fd.L1.Message != nil || fd.L1.ContainingOneof != nil)
+}
+func (fd *Field) HasOptionalKeyword() bool {
+	return (fd.L0.ParentFile.L1.Syntax == pref.Proto2 && fd.L1.Cardinality == pref.Optional && fd.L1.ContainingOneof == nil) || fd.L1.IsProto3Optional
+}
+func (fd *Field) IsPacked() bool {
+	if !fd.L1.HasPacked && fd.L0.ParentFile.L1.Syntax != pref.Proto2 && fd.L1.Cardinality == pref.Repeated {
+		switch fd.L1.Kind {
+		case pref.StringKind, pref.BytesKind, pref.MessageKind, pref.GroupKind:
+		default:
+			return true
+		}
+	}
+	return fd.L1.IsPacked
+}
+func (fd *Field) IsExtension() bool { return false }
+func (fd *Field) IsWeak() bool      { return fd.L1.IsWeak }
+func (fd *Field) IsList() bool      { return fd.Cardinality() == pref.Repeated && !fd.IsMap() }
+func (fd *Field) IsMap() bool       { return fd.Message() != nil && fd.Message().IsMapEntry() }
+func (fd *Field) MapKey() pref.FieldDescriptor {
+	if !fd.IsMap() {
+		return nil
+	}
+	return fd.Message().Fields().ByNumber(1)
+}
+func (fd *Field) MapValue() pref.FieldDescriptor {
+	if !fd.IsMap() {
+		return nil
+	}
+	return fd.Message().Fields().ByNumber(2)
+}
+func (fd *Field) HasDefault() bool                           { return fd.L1.Default.has }
+func (fd *Field) Default() pref.Value                        { return fd.L1.Default.get(fd) }
+func (fd *Field) DefaultEnumValue() pref.EnumValueDescriptor { return fd.L1.Default.enum }
+func (fd *Field) ContainingOneof() pref.OneofDescriptor      { return fd.L1.ContainingOneof }
+func (fd *Field) ContainingMessage() pref.MessageDescriptor {
+	return fd.L0.Parent.(pref.MessageDescriptor)
+}
+func (fd *Field) Enum() pref.EnumDescriptor {
+	return fd.L1.Enum
+}
+func (fd *Field) Message() pref.MessageDescriptor {
+	if fd.L1.IsWeak {
+		if d, _ := protoregistry.GlobalFiles.FindDescriptorByName(fd.L1.Message.FullName()); d != nil {
+			return d.(pref.MessageDescriptor)
+		}
+	}
+	return fd.L1.Message
+}
+func (fd *Field) Format(s fmt.State, r rune)     { descfmt.FormatDesc(s, r, fd) }
+func (fd *Field) ProtoType(pref.FieldDescriptor) {}
+
+// EnforceUTF8 is a pseudo-internal API to determine whether to enforce UTF-8
+// validation for the string field. This exists for Google-internal use only
+// since proto3 did not enforce UTF-8 validity prior to the open-source release.
+// If this method does not exist, the default is to enforce valid UTF-8.
+//
+// WARNING: This method is exempt from the compatibility promise and may be
+// removed in the future without warning.
+func (fd *Field) EnforceUTF8() bool {
+	if fd.L1.HasEnforceUTF8 {
+		return fd.L1.EnforceUTF8
+	}
+	return fd.L0.ParentFile.L1.Syntax == pref.Proto3
+}
+
+func (od *Oneof) IsSynthetic() bool {
+	return od.L0.ParentFile.L1.Syntax == pref.Proto3 && len(od.L1.Fields.List) == 1 && od.L1.Fields.List[0].HasOptionalKeyword()
+}
+func (od *Oneof) Options() pref.ProtoMessage {
+	if f := od.L1.Options; f != nil {
+		return f()
+	}
+	return descopts.Oneof
+}
+func (od *Oneof) Fields() pref.FieldDescriptors  { return &od.L1.Fields }
+func (od *Oneof) Format(s fmt.State, r rune)     { descfmt.FormatDesc(s, r, od) }
+func (od *Oneof) ProtoType(pref.OneofDescriptor) {}
+
+type (
+	Extension struct {
+		Base
+		L1 ExtensionL1
+		L2 *ExtensionL2 // protected by fileDesc.once
+	}
+	ExtensionL1 struct {
+		Number      pref.FieldNumber
+		Extendee    pref.MessageDescriptor
+		Cardinality pref.Cardinality
+		Kind        pref.Kind
+	}
+	ExtensionL2 struct {
+		Options          func() pref.ProtoMessage
+		JSONName         jsonName
+		IsProto3Optional bool // promoted from google.protobuf.FieldDescriptorProto
+		IsPacked         bool // promoted from google.protobuf.FieldOptions
+		Default          defaultValue
+		Enum             pref.EnumDescriptor
+		Message          pref.MessageDescriptor
+	}
+)
+
+func (xd *Extension) Options() pref.ProtoMessage {
+	if f := xd.lazyInit().Options; f != nil {
+		return f()
+	}
+	return descopts.Field
+}
+func (xd *Extension) Number() pref.FieldNumber      { return xd.L1.Number }
+func (xd *Extension) Cardinality() pref.Cardinality { return xd.L1.Cardinality }
+func (xd *Extension) Kind() pref.Kind               { return xd.L1.Kind }
+func (xd *Extension) HasJSONName() bool             { return xd.lazyInit().JSONName.has }
+func (xd *Extension) JSONName() string              { return xd.lazyInit().JSONName.get(xd) }
+func (xd *Extension) HasPresence() bool             { return xd.L1.Cardinality != pref.Repeated }
+func (xd *Extension) HasOptionalKeyword() bool {
+	return (xd.L0.ParentFile.L1.Syntax == pref.Proto2 && xd.L1.Cardinality == pref.Optional) || xd.lazyInit().IsProto3Optional
+}
+func (xd *Extension) IsPacked() bool                             { return xd.lazyInit().IsPacked }
+func (xd *Extension) IsExtension() bool                          { return true }
+func (xd *Extension) IsWeak() bool                               { return false }
+func (xd *Extension) IsList() bool                               { return xd.Cardinality() == pref.Repeated }
+func (xd *Extension) IsMap() bool                                { return false }
+func (xd *Extension) MapKey() pref.FieldDescriptor               { return nil }
+func (xd *Extension) MapValue() pref.FieldDescriptor             { return nil }
+func (xd *Extension) HasDefault() bool                           { return xd.lazyInit().Default.has }
+func (xd *Extension) Default() pref.Value                        { return xd.lazyInit().Default.get(xd) }
+func (xd *Extension) DefaultEnumValue() pref.EnumValueDescriptor { return xd.lazyInit().Default.enum }
+func (xd *Extension) ContainingOneof() pref.OneofDescriptor      { return nil }
+func (xd *Extension) ContainingMessage() pref.MessageDescriptor  { return xd.L1.Extendee }
+func (xd *Extension) Enum() pref.EnumDescriptor                  { return xd.lazyInit().Enum }
+func (xd *Extension) Message() pref.MessageDescriptor            { return xd.lazyInit().Message }
+func (xd *Extension) Format(s fmt.State, r rune)                 { descfmt.FormatDesc(s, r, xd) }
+func (xd *Extension) ProtoType(pref.FieldDescriptor)             {}
+func (xd *Extension) ProtoInternal(pragma.DoNotImplement)        {}
+func (xd *Extension) lazyInit() *ExtensionL2 {
+	xd.L0.ParentFile.lazyInit() // implicitly initializes L2
+	return xd.L2
+}
+
+type (
+	Service struct {
+		Base
+		L1 ServiceL1
+		L2 *ServiceL2 // protected by fileDesc.once
+	}
+	ServiceL1 struct{}
+	ServiceL2 struct {
+		Options func() pref.ProtoMessage
+		Methods Methods
+	}
+
+	Method struct {
+		Base
+		L1 MethodL1
+	}
+	MethodL1 struct {
+		Options           func() pref.ProtoMessage
+		Input             pref.MessageDescriptor
+		Output            pref.MessageDescriptor
+		IsStreamingClient bool
+		IsStreamingServer bool
+	}
+)
+
+func (sd *Service) Options() pref.ProtoMessage {
+	if f := sd.lazyInit().Options; f != nil {
+		return f()
+	}
+	return descopts.Service
+}
+func (sd *Service) Methods() pref.MethodDescriptors     { return &sd.lazyInit().Methods }
+func (sd *Service) Format(s fmt.State, r rune)          { descfmt.FormatDesc(s, r, sd) }
+func (sd *Service) ProtoType(pref.ServiceDescriptor)    {}
+func (sd *Service) ProtoInternal(pragma.DoNotImplement) {}
+func (sd *Service) lazyInit() *ServiceL2 {
+	sd.L0.ParentFile.lazyInit() // implicitly initializes L2
+	return sd.L2
+}
+
+func (md *Method) Options() pref.ProtoMessage {
+	if f := md.L1.Options; f != nil {
+		return f()
+	}
+	return descopts.Method
+}
+func (md *Method) Input() pref.MessageDescriptor       { return md.L1.Input }
+func (md *Method) Output() pref.MessageDescriptor      { return md.L1.Output }
+func (md *Method) IsStreamingClient() bool             { return md.L1.IsStreamingClient }
+func (md *Method) IsStreamingServer() bool             { return md.L1.IsStreamingServer }
+func (md *Method) Format(s fmt.State, r rune)          { descfmt.FormatDesc(s, r, md) }
+func (md *Method) ProtoType(pref.MethodDescriptor)     {}
+func (md *Method) ProtoInternal(pragma.DoNotImplement) {}
+
+// Surrogate files are can be used to create standalone descriptors
+// where the syntax is only information derived from the parent file.
+var (
+	SurrogateProto2 = &File{L1: FileL1{Syntax: pref.Proto2}, L2: &FileL2{}}
+	SurrogateProto3 = &File{L1: FileL1{Syntax: pref.Proto3}, L2: &FileL2{}}
+)
+
+type (
+	Base struct {
+		L0 BaseL0
+	}
+	BaseL0 struct {
+		FullName   pref.FullName // must be populated
+		ParentFile *File         // must be populated
+		Parent     pref.Descriptor
+		Index      int
+	}
+)
+
+func (d *Base) Name() pref.Name         { return d.L0.FullName.Name() }
+func (d *Base) FullName() pref.FullName { return d.L0.FullName }
+func (d *Base) ParentFile() pref.FileDescriptor {
+	if d.L0.ParentFile == SurrogateProto2 || d.L0.ParentFile == SurrogateProto3 {
+		return nil // surrogate files are not real parents
+	}
+	return d.L0.ParentFile
+}
+func (d *Base) Parent() pref.Descriptor             { return d.L0.Parent }
+func (d *Base) Index() int                          { return d.L0.Index }
+func (d *Base) Syntax() pref.Syntax                 { return d.L0.ParentFile.Syntax() }
+func (d *Base) IsPlaceholder() bool                 { return false }
+func (d *Base) ProtoInternal(pragma.DoNotImplement) {}
+
+type jsonName struct {
+	has  bool
+	once sync.Once
+	name string
+}
+
+// Init initializes the name. It is exported for use by other internal packages.
+func (js *jsonName) Init(s string) {
+	js.has = true
+	js.name = s
+}
+
+func (js *jsonName) get(fd pref.FieldDescriptor) string {
+	if !js.has {
+		js.once.Do(func() {
+			js.name = strs.JSONCamelCase(string(fd.Name()))
+		})
+	}
+	return js.name
+}
+
+func DefaultValue(v pref.Value, ev pref.EnumValueDescriptor) defaultValue {
+	dv := defaultValue{has: v.IsValid(), val: v, enum: ev}
+	if b, ok := v.Interface().([]byte); ok {
+		// Store a copy of the default bytes, so that we can detect
+		// accidental mutations of the original value.
+		dv.bytes = append([]byte(nil), b...)
+	}
+	return dv
+}
+
+func unmarshalDefault(b []byte, k pref.Kind, pf *File, ed pref.EnumDescriptor) defaultValue {
+	var evs pref.EnumValueDescriptors
+	if k == pref.EnumKind {
+		// If the enum is declared within the same file, be careful not to
+		// blindly call the Values method, lest we bind ourselves in a deadlock.
+		if e, ok := ed.(*Enum); ok && e.L0.ParentFile == pf {
+			evs = &e.L2.Values
+		} else {
+			evs = ed.Values()
+		}
+
+		// If we are unable to resolve the enum dependency, use a placeholder
+		// enum value since we will not be able to parse the default value.
+		if ed.IsPlaceholder() && pref.Name(b).IsValid() {
+			v := pref.ValueOfEnum(0)
+			ev := PlaceholderEnumValue(ed.FullName().Parent().Append(pref.Name(b)))
+			return DefaultValue(v, ev)
+		}
+	}
+
+	v, ev, err := defval.Unmarshal(string(b), k, evs, defval.Descriptor)
+	if err != nil {
+		panic(err)
+	}
+	return DefaultValue(v, ev)
+}
+
+type defaultValue struct {
+	has   bool
+	val   pref.Value
+	enum  pref.EnumValueDescriptor
+	bytes []byte
+}
+
+func (dv *defaultValue) get(fd pref.FieldDescriptor) pref.Value {
+	// Return the zero value as the default if unpopulated.
+	if !dv.has {
+		if fd.Cardinality() == pref.Repeated {
+			return pref.Value{}
+		}
+		switch fd.Kind() {
+		case pref.BoolKind:
+			return pref.ValueOfBool(false)
+		case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
+			return pref.ValueOfInt32(0)
+		case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+			return pref.ValueOfInt64(0)
+		case pref.Uint32Kind, pref.Fixed32Kind:
+			return pref.ValueOfUint32(0)
+		case pref.Uint64Kind, pref.Fixed64Kind:
+			return pref.ValueOfUint64(0)
+		case pref.FloatKind:
+			return pref.ValueOfFloat32(0)
+		case pref.DoubleKind:
+			return pref.ValueOfFloat64(0)
+		case pref.StringKind:
+			return pref.ValueOfString("")
+		case pref.BytesKind:
+			return pref.ValueOfBytes(nil)
+		case pref.EnumKind:
+			if evs := fd.Enum().Values(); evs.Len() > 0 {
+				return pref.ValueOfEnum(evs.Get(0).Number())
+			}
+			return pref.ValueOfEnum(0)
+		}
+	}
+
+	if len(dv.bytes) > 0 && !bytes.Equal(dv.bytes, dv.val.Bytes()) {
+		// TODO: Avoid panic if we're running with the race detector
+		// and instead spawn a goroutine that periodically resets
+		// this value back to the original to induce a race.
+		panic(fmt.Sprintf("detected mutation on the default bytes for %v", fd.FullName()))
+	}
+	return dv.val
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/desc_init.go b/vendor/google.golang.org/protobuf/internal/filedesc/desc_init.go
new file mode 100644
index 0000000..c0cddf8
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/desc_init.go
@@ -0,0 +1,471 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filedesc
+
+import (
+	"sync"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/fieldnum"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// fileRaw is a data struct used when initializing a file descriptor from
+// a raw FileDescriptorProto.
+type fileRaw struct {
+	builder       Builder
+	allEnums      []Enum
+	allMessages   []Message
+	allExtensions []Extension
+	allServices   []Service
+}
+
+func newRawFile(db Builder) *File {
+	fd := &File{fileRaw: fileRaw{builder: db}}
+	fd.initDecls(db.NumEnums, db.NumMessages, db.NumExtensions, db.NumServices)
+	fd.unmarshalSeed(db.RawDescriptor)
+
+	// Extended message targets are eagerly resolved since registration
+	// needs this information at program init time.
+	for i := range fd.allExtensions {
+		xd := &fd.allExtensions[i]
+		xd.L1.Extendee = fd.resolveMessageDependency(xd.L1.Extendee, listExtTargets, int32(i))
+	}
+
+	fd.checkDecls()
+	return fd
+}
+
+// initDecls pre-allocates slices for the exact number of enums, messages
+// (including map entries), extensions, and services declared in the proto file.
+// This is done to avoid regrowing the slice, which would change the address
+// for any previously seen declaration.
+//
+// The alloc methods "allocates" slices by pulling from the capacity.
+func (fd *File) initDecls(numEnums, numMessages, numExtensions, numServices int32) {
+	fd.allEnums = make([]Enum, 0, numEnums)
+	fd.allMessages = make([]Message, 0, numMessages)
+	fd.allExtensions = make([]Extension, 0, numExtensions)
+	fd.allServices = make([]Service, 0, numServices)
+}
+
+func (fd *File) allocEnums(n int) []Enum {
+	total := len(fd.allEnums)
+	es := fd.allEnums[total : total+n]
+	fd.allEnums = fd.allEnums[:total+n]
+	return es
+}
+func (fd *File) allocMessages(n int) []Message {
+	total := len(fd.allMessages)
+	ms := fd.allMessages[total : total+n]
+	fd.allMessages = fd.allMessages[:total+n]
+	return ms
+}
+func (fd *File) allocExtensions(n int) []Extension {
+	total := len(fd.allExtensions)
+	xs := fd.allExtensions[total : total+n]
+	fd.allExtensions = fd.allExtensions[:total+n]
+	return xs
+}
+func (fd *File) allocServices(n int) []Service {
+	total := len(fd.allServices)
+	xs := fd.allServices[total : total+n]
+	fd.allServices = fd.allServices[:total+n]
+	return xs
+}
+
+// checkDecls performs a sanity check that the expected number of expected
+// declarations matches the number that were found in the descriptor proto.
+func (fd *File) checkDecls() {
+	switch {
+	case len(fd.allEnums) != cap(fd.allEnums):
+	case len(fd.allMessages) != cap(fd.allMessages):
+	case len(fd.allExtensions) != cap(fd.allExtensions):
+	case len(fd.allServices) != cap(fd.allServices):
+	default:
+		return
+	}
+	panic("mismatching cardinality")
+}
+
+func (fd *File) unmarshalSeed(b []byte) {
+	sb := getBuilder()
+	defer putBuilder(sb)
+
+	var prevField pref.FieldNumber
+	var numEnums, numMessages, numExtensions, numServices int
+	var posEnums, posMessages, posExtensions, posServices int
+	b0 := b
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FileDescriptorProto_Syntax:
+				switch string(v) {
+				case "proto2":
+					fd.L1.Syntax = pref.Proto2
+				case "proto3":
+					fd.L1.Syntax = pref.Proto3
+				default:
+					panic("invalid syntax")
+				}
+			case fieldnum.FileDescriptorProto_Name:
+				fd.L1.Path = sb.MakeString(v)
+			case fieldnum.FileDescriptorProto_Package:
+				fd.L1.Package = pref.FullName(sb.MakeString(v))
+			case fieldnum.FileDescriptorProto_EnumType:
+				if prevField != fieldnum.FileDescriptorProto_EnumType {
+					if numEnums > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posEnums = len(b0) - len(b) - n - m
+				}
+				numEnums++
+			case fieldnum.FileDescriptorProto_MessageType:
+				if prevField != fieldnum.FileDescriptorProto_MessageType {
+					if numMessages > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posMessages = len(b0) - len(b) - n - m
+				}
+				numMessages++
+			case fieldnum.FileDescriptorProto_Extension:
+				if prevField != fieldnum.FileDescriptorProto_Extension {
+					if numExtensions > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posExtensions = len(b0) - len(b) - n - m
+				}
+				numExtensions++
+			case fieldnum.FileDescriptorProto_Service:
+				if prevField != fieldnum.FileDescriptorProto_Service {
+					if numServices > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posServices = len(b0) - len(b) - n - m
+				}
+				numServices++
+			}
+			prevField = num
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+			prevField = -1 // ignore known field numbers of unknown wire type
+		}
+	}
+
+	// If syntax is missing, it is assumed to be proto2.
+	if fd.L1.Syntax == 0 {
+		fd.L1.Syntax = pref.Proto2
+	}
+
+	// Must allocate all declarations before parsing each descriptor type
+	// to ensure we handled all descriptors in "flattened ordering".
+	if numEnums > 0 {
+		fd.L1.Enums.List = fd.allocEnums(numEnums)
+	}
+	if numMessages > 0 {
+		fd.L1.Messages.List = fd.allocMessages(numMessages)
+	}
+	if numExtensions > 0 {
+		fd.L1.Extensions.List = fd.allocExtensions(numExtensions)
+	}
+	if numServices > 0 {
+		fd.L1.Services.List = fd.allocServices(numServices)
+	}
+
+	if numEnums > 0 {
+		b := b0[posEnums:]
+		for i := range fd.L1.Enums.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			fd.L1.Enums.List[i].unmarshalSeed(v, sb, fd, fd, i)
+			b = b[n+m:]
+		}
+	}
+	if numMessages > 0 {
+		b := b0[posMessages:]
+		for i := range fd.L1.Messages.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			fd.L1.Messages.List[i].unmarshalSeed(v, sb, fd, fd, i)
+			b = b[n+m:]
+		}
+	}
+	if numExtensions > 0 {
+		b := b0[posExtensions:]
+		for i := range fd.L1.Extensions.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			fd.L1.Extensions.List[i].unmarshalSeed(v, sb, fd, fd, i)
+			b = b[n+m:]
+		}
+	}
+	if numServices > 0 {
+		b := b0[posServices:]
+		for i := range fd.L1.Services.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			fd.L1.Services.List[i].unmarshalSeed(v, sb, fd, fd, i)
+			b = b[n+m:]
+		}
+	}
+}
+
+func (ed *Enum) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	ed.L0.ParentFile = pf
+	ed.L0.Parent = pd
+	ed.L0.Index = i
+
+	var numValues int
+	for b := b; len(b) > 0; {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumDescriptorProto_Name:
+				ed.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.EnumDescriptorProto_Value:
+				numValues++
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+
+	// Only construct enum value descriptors for top-level enums since
+	// they are needed for registration.
+	if pd != pf {
+		return
+	}
+	ed.L1.eagerValues = true
+	ed.L2 = new(EnumL2)
+	ed.L2.Values.List = make([]EnumValue, numValues)
+	for i := 0; len(b) > 0; {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumDescriptorProto_Value:
+				ed.L2.Values.List[i].unmarshalFull(v, sb, pf, ed, i)
+				i++
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func (md *Message) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	md.L0.ParentFile = pf
+	md.L0.Parent = pd
+	md.L0.Index = i
+
+	var prevField pref.FieldNumber
+	var numEnums, numMessages, numExtensions int
+	var posEnums, posMessages, posExtensions int
+	b0 := b
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.DescriptorProto_Name:
+				md.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.DescriptorProto_EnumType:
+				if prevField != fieldnum.DescriptorProto_EnumType {
+					if numEnums > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posEnums = len(b0) - len(b) - n - m
+				}
+				numEnums++
+			case fieldnum.DescriptorProto_NestedType:
+				if prevField != fieldnum.DescriptorProto_NestedType {
+					if numMessages > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posMessages = len(b0) - len(b) - n - m
+				}
+				numMessages++
+			case fieldnum.DescriptorProto_Extension:
+				if prevField != fieldnum.DescriptorProto_Extension {
+					if numExtensions > 0 {
+						panic("non-contiguous repeated field")
+					}
+					posExtensions = len(b0) - len(b) - n - m
+				}
+				numExtensions++
+			case fieldnum.DescriptorProto_Options:
+				md.unmarshalSeedOptions(v)
+			}
+			prevField = num
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+			prevField = -1 // ignore known field numbers of unknown wire type
+		}
+	}
+
+	// Must allocate all declarations before parsing each descriptor type
+	// to ensure we handled all descriptors in "flattened ordering".
+	if numEnums > 0 {
+		md.L1.Enums.List = pf.allocEnums(numEnums)
+	}
+	if numMessages > 0 {
+		md.L1.Messages.List = pf.allocMessages(numMessages)
+	}
+	if numExtensions > 0 {
+		md.L1.Extensions.List = pf.allocExtensions(numExtensions)
+	}
+
+	if numEnums > 0 {
+		b := b0[posEnums:]
+		for i := range md.L1.Enums.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			md.L1.Enums.List[i].unmarshalSeed(v, sb, pf, md, i)
+			b = b[n+m:]
+		}
+	}
+	if numMessages > 0 {
+		b := b0[posMessages:]
+		for i := range md.L1.Messages.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			md.L1.Messages.List[i].unmarshalSeed(v, sb, pf, md, i)
+			b = b[n+m:]
+		}
+	}
+	if numExtensions > 0 {
+		b := b0[posExtensions:]
+		for i := range md.L1.Extensions.List {
+			_, n := protowire.ConsumeVarint(b)
+			v, m := protowire.ConsumeBytes(b[n:])
+			md.L1.Extensions.List[i].unmarshalSeed(v, sb, pf, md, i)
+			b = b[n+m:]
+		}
+	}
+}
+
+func (md *Message) unmarshalSeedOptions(b []byte) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.MessageOptions_MapEntry:
+				md.L1.IsMapEntry = protowire.DecodeBool(v)
+			case fieldnum.MessageOptions_MessageSetWireFormat:
+				md.L1.IsMessageSet = protowire.DecodeBool(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func (xd *Extension) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	xd.L0.ParentFile = pf
+	xd.L0.Parent = pd
+	xd.L0.Index = i
+
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Number:
+				xd.L1.Number = pref.FieldNumber(v)
+			case fieldnum.FieldDescriptorProto_Label:
+				xd.L1.Cardinality = pref.Cardinality(v)
+			case fieldnum.FieldDescriptorProto_Type:
+				xd.L1.Kind = pref.Kind(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Name:
+				xd.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.FieldDescriptorProto_Extendee:
+				xd.L1.Extendee = PlaceholderMessage(makeFullName(sb, v))
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func (sd *Service) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	sd.L0.ParentFile = pf
+	sd.L0.Parent = pd
+	sd.L0.Index = i
+
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.ServiceDescriptorProto_Name:
+				sd.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+var nameBuilderPool = sync.Pool{
+	New: func() interface{} { return new(strs.Builder) },
+}
+
+func getBuilder() *strs.Builder {
+	return nameBuilderPool.Get().(*strs.Builder)
+}
+func putBuilder(b *strs.Builder) {
+	nameBuilderPool.Put(b)
+}
+
+// makeFullName converts b to a protoreflect.FullName,
+// where b must start with a leading dot.
+func makeFullName(sb *strs.Builder, b []byte) pref.FullName {
+	if len(b) == 0 || b[0] != '.' {
+		panic("name reference must be fully qualified")
+	}
+	return pref.FullName(sb.MakeString(b[1:]))
+}
+
+func appendFullName(sb *strs.Builder, prefix pref.FullName, suffix []byte) pref.FullName {
+	return sb.AppendFullName(prefix, pref.Name(strs.UnsafeString(suffix)))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/desc_lazy.go b/vendor/google.golang.org/protobuf/internal/filedesc/desc_lazy.go
new file mode 100644
index 0000000..bc21594
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/desc_lazy.go
@@ -0,0 +1,704 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filedesc
+
+import (
+	"reflect"
+	"sync"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/descopts"
+	"google.golang.org/protobuf/internal/fieldnum"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+func (fd *File) lazyRawInit() {
+	fd.unmarshalFull(fd.builder.RawDescriptor)
+	fd.resolveMessages()
+	fd.resolveExtensions()
+	fd.resolveServices()
+}
+
+func (file *File) resolveMessages() {
+	var depIdx int32
+	for i := range file.allMessages {
+		md := &file.allMessages[i]
+
+		// Resolve message field dependencies.
+		for j := range md.L2.Fields.List {
+			fd := &md.L2.Fields.List[j]
+
+			// Weak fields are resolved upon actual use.
+			if fd.L1.IsWeak {
+				continue
+			}
+
+			// Resolve message field dependency.
+			switch fd.L1.Kind {
+			case pref.EnumKind:
+				fd.L1.Enum = file.resolveEnumDependency(fd.L1.Enum, listFieldDeps, depIdx)
+				depIdx++
+			case pref.MessageKind, pref.GroupKind:
+				fd.L1.Message = file.resolveMessageDependency(fd.L1.Message, listFieldDeps, depIdx)
+				depIdx++
+			}
+
+			// Default is resolved here since it depends on Enum being resolved.
+			if v := fd.L1.Default.val; v.IsValid() {
+				fd.L1.Default = unmarshalDefault(v.Bytes(), fd.L1.Kind, file, fd.L1.Enum)
+			}
+		}
+	}
+}
+
+func (file *File) resolveExtensions() {
+	var depIdx int32
+	for i := range file.allExtensions {
+		xd := &file.allExtensions[i]
+
+		// Resolve extension field dependency.
+		switch xd.L1.Kind {
+		case pref.EnumKind:
+			xd.L2.Enum = file.resolveEnumDependency(xd.L2.Enum, listExtDeps, depIdx)
+			depIdx++
+		case pref.MessageKind, pref.GroupKind:
+			xd.L2.Message = file.resolveMessageDependency(xd.L2.Message, listExtDeps, depIdx)
+			depIdx++
+		}
+
+		// Default is resolved here since it depends on Enum being resolved.
+		if v := xd.L2.Default.val; v.IsValid() {
+			xd.L2.Default = unmarshalDefault(v.Bytes(), xd.L1.Kind, file, xd.L2.Enum)
+		}
+	}
+}
+
+func (file *File) resolveServices() {
+	var depIdx int32
+	for i := range file.allServices {
+		sd := &file.allServices[i]
+
+		// Resolve method dependencies.
+		for j := range sd.L2.Methods.List {
+			md := &sd.L2.Methods.List[j]
+			md.L1.Input = file.resolveMessageDependency(md.L1.Input, listMethInDeps, depIdx)
+			md.L1.Output = file.resolveMessageDependency(md.L1.Output, listMethOutDeps, depIdx)
+			depIdx++
+		}
+	}
+}
+
+func (file *File) resolveEnumDependency(ed pref.EnumDescriptor, i, j int32) pref.EnumDescriptor {
+	r := file.builder.FileRegistry
+	if r, ok := r.(resolverByIndex); ok {
+		if ed2 := r.FindEnumByIndex(i, j, file.allEnums, file.allMessages); ed2 != nil {
+			return ed2
+		}
+	}
+	for i := range file.allEnums {
+		if ed2 := &file.allEnums[i]; ed2.L0.FullName == ed.FullName() {
+			return ed2
+		}
+	}
+	if d, _ := r.FindDescriptorByName(ed.FullName()); d != nil {
+		return d.(pref.EnumDescriptor)
+	}
+	return ed
+}
+
+func (file *File) resolveMessageDependency(md pref.MessageDescriptor, i, j int32) pref.MessageDescriptor {
+	r := file.builder.FileRegistry
+	if r, ok := r.(resolverByIndex); ok {
+		if md2 := r.FindMessageByIndex(i, j, file.allEnums, file.allMessages); md2 != nil {
+			return md2
+		}
+	}
+	for i := range file.allMessages {
+		if md2 := &file.allMessages[i]; md2.L0.FullName == md.FullName() {
+			return md2
+		}
+	}
+	if d, _ := r.FindDescriptorByName(md.FullName()); d != nil {
+		return d.(pref.MessageDescriptor)
+	}
+	return md
+}
+
+func (fd *File) unmarshalFull(b []byte) {
+	sb := getBuilder()
+	defer putBuilder(sb)
+
+	var enumIdx, messageIdx, extensionIdx, serviceIdx int
+	var rawOptions []byte
+	fd.L2 = new(FileL2)
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FileDescriptorProto_PublicDependency:
+				fd.L2.Imports[v].IsPublic = true
+			case fieldnum.FileDescriptorProto_WeakDependency:
+				fd.L2.Imports[v].IsWeak = true
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FileDescriptorProto_Dependency:
+				path := sb.MakeString(v)
+				imp, _ := fd.builder.FileRegistry.FindFileByPath(path)
+				if imp == nil {
+					imp = PlaceholderFile(path)
+				}
+				fd.L2.Imports = append(fd.L2.Imports, pref.FileImport{FileDescriptor: imp})
+			case fieldnum.FileDescriptorProto_EnumType:
+				fd.L1.Enums.List[enumIdx].unmarshalFull(v, sb)
+				enumIdx++
+			case fieldnum.FileDescriptorProto_MessageType:
+				fd.L1.Messages.List[messageIdx].unmarshalFull(v, sb)
+				messageIdx++
+			case fieldnum.FileDescriptorProto_Extension:
+				fd.L1.Extensions.List[extensionIdx].unmarshalFull(v, sb)
+				extensionIdx++
+			case fieldnum.FileDescriptorProto_Service:
+				fd.L1.Services.List[serviceIdx].unmarshalFull(v, sb)
+				serviceIdx++
+			case fieldnum.FileDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	fd.L2.Options = fd.builder.optionsUnmarshaler(&descopts.File, rawOptions)
+}
+
+func (ed *Enum) unmarshalFull(b []byte, sb *strs.Builder) {
+	var rawValues [][]byte
+	var rawOptions []byte
+	if !ed.L1.eagerValues {
+		ed.L2 = new(EnumL2)
+	}
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumDescriptorProto_Value:
+				rawValues = append(rawValues, v)
+			case fieldnum.EnumDescriptorProto_ReservedName:
+				ed.L2.ReservedNames.List = append(ed.L2.ReservedNames.List, pref.Name(sb.MakeString(v)))
+			case fieldnum.EnumDescriptorProto_ReservedRange:
+				ed.L2.ReservedRanges.List = append(ed.L2.ReservedRanges.List, unmarshalEnumReservedRange(v))
+			case fieldnum.EnumDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	if !ed.L1.eagerValues && len(rawValues) > 0 {
+		ed.L2.Values.List = make([]EnumValue, len(rawValues))
+		for i, b := range rawValues {
+			ed.L2.Values.List[i].unmarshalFull(b, sb, ed.L0.ParentFile, ed, i)
+		}
+	}
+	ed.L2.Options = ed.L0.ParentFile.builder.optionsUnmarshaler(&descopts.Enum, rawOptions)
+}
+
+func unmarshalEnumReservedRange(b []byte) (r [2]pref.EnumNumber) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumDescriptorProto_EnumReservedRange_Start:
+				r[0] = pref.EnumNumber(v)
+			case fieldnum.EnumDescriptorProto_EnumReservedRange_End:
+				r[1] = pref.EnumNumber(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	return r
+}
+
+func (vd *EnumValue) unmarshalFull(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	vd.L0.ParentFile = pf
+	vd.L0.Parent = pd
+	vd.L0.Index = i
+
+	var rawOptions []byte
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumValueDescriptorProto_Number:
+				vd.L1.Number = pref.EnumNumber(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.EnumValueDescriptorProto_Name:
+				// NOTE: Enum values are in the same scope as the enum parent.
+				vd.L0.FullName = appendFullName(sb, pd.Parent().FullName(), v)
+			case fieldnum.EnumValueDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	vd.L1.Options = pf.builder.optionsUnmarshaler(&descopts.EnumValue, rawOptions)
+}
+
+func (md *Message) unmarshalFull(b []byte, sb *strs.Builder) {
+	var rawFields, rawOneofs [][]byte
+	var enumIdx, messageIdx, extensionIdx int
+	var rawOptions []byte
+	md.L2 = new(MessageL2)
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.DescriptorProto_Field:
+				rawFields = append(rawFields, v)
+			case fieldnum.DescriptorProto_OneofDecl:
+				rawOneofs = append(rawOneofs, v)
+			case fieldnum.DescriptorProto_ReservedName:
+				md.L2.ReservedNames.List = append(md.L2.ReservedNames.List, pref.Name(sb.MakeString(v)))
+			case fieldnum.DescriptorProto_ReservedRange:
+				md.L2.ReservedRanges.List = append(md.L2.ReservedRanges.List, unmarshalMessageReservedRange(v))
+			case fieldnum.DescriptorProto_ExtensionRange:
+				r, rawOptions := unmarshalMessageExtensionRange(v)
+				opts := md.L0.ParentFile.builder.optionsUnmarshaler(&descopts.ExtensionRange, rawOptions)
+				md.L2.ExtensionRanges.List = append(md.L2.ExtensionRanges.List, r)
+				md.L2.ExtensionRangeOptions = append(md.L2.ExtensionRangeOptions, opts)
+			case fieldnum.DescriptorProto_EnumType:
+				md.L1.Enums.List[enumIdx].unmarshalFull(v, sb)
+				enumIdx++
+			case fieldnum.DescriptorProto_NestedType:
+				md.L1.Messages.List[messageIdx].unmarshalFull(v, sb)
+				messageIdx++
+			case fieldnum.DescriptorProto_Extension:
+				md.L1.Extensions.List[extensionIdx].unmarshalFull(v, sb)
+				extensionIdx++
+			case fieldnum.DescriptorProto_Options:
+				md.unmarshalOptions(v)
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	if len(rawFields) > 0 || len(rawOneofs) > 0 {
+		md.L2.Fields.List = make([]Field, len(rawFields))
+		md.L2.Oneofs.List = make([]Oneof, len(rawOneofs))
+		for i, b := range rawFields {
+			fd := &md.L2.Fields.List[i]
+			fd.unmarshalFull(b, sb, md.L0.ParentFile, md, i)
+			if fd.L1.Cardinality == pref.Required {
+				md.L2.RequiredNumbers.List = append(md.L2.RequiredNumbers.List, fd.L1.Number)
+			}
+		}
+		for i, b := range rawOneofs {
+			od := &md.L2.Oneofs.List[i]
+			od.unmarshalFull(b, sb, md.L0.ParentFile, md, i)
+		}
+	}
+	md.L2.Options = md.L0.ParentFile.builder.optionsUnmarshaler(&descopts.Message, rawOptions)
+}
+
+func (md *Message) unmarshalOptions(b []byte) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.MessageOptions_MapEntry:
+				md.L1.IsMapEntry = protowire.DecodeBool(v)
+			case fieldnum.MessageOptions_MessageSetWireFormat:
+				md.L1.IsMessageSet = protowire.DecodeBool(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func unmarshalMessageReservedRange(b []byte) (r [2]pref.FieldNumber) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.DescriptorProto_ReservedRange_Start:
+				r[0] = pref.FieldNumber(v)
+			case fieldnum.DescriptorProto_ReservedRange_End:
+				r[1] = pref.FieldNumber(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	return r
+}
+
+func unmarshalMessageExtensionRange(b []byte) (r [2]pref.FieldNumber, rawOptions []byte) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.DescriptorProto_ExtensionRange_Start:
+				r[0] = pref.FieldNumber(v)
+			case fieldnum.DescriptorProto_ExtensionRange_End:
+				r[1] = pref.FieldNumber(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.DescriptorProto_ExtensionRange_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	return r, rawOptions
+}
+
+func (fd *Field) unmarshalFull(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	fd.L0.ParentFile = pf
+	fd.L0.Parent = pd
+	fd.L0.Index = i
+
+	var rawTypeName []byte
+	var rawOptions []byte
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Number:
+				fd.L1.Number = pref.FieldNumber(v)
+			case fieldnum.FieldDescriptorProto_Label:
+				fd.L1.Cardinality = pref.Cardinality(v)
+			case fieldnum.FieldDescriptorProto_Type:
+				fd.L1.Kind = pref.Kind(v)
+			case fieldnum.FieldDescriptorProto_OneofIndex:
+				// In Message.unmarshalFull, we allocate slices for both
+				// the field and oneof descriptors before unmarshaling either
+				// of them. This ensures pointers to slice elements are stable.
+				od := &pd.(*Message).L2.Oneofs.List[v]
+				od.L1.Fields.List = append(od.L1.Fields.List, fd)
+				if fd.L1.ContainingOneof != nil {
+					panic("oneof type already set")
+				}
+				fd.L1.ContainingOneof = od
+			case fieldnum.FieldDescriptorProto_Proto3Optional:
+				fd.L1.IsProto3Optional = protowire.DecodeBool(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Name:
+				fd.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.FieldDescriptorProto_JsonName:
+				fd.L1.JSONName.Init(sb.MakeString(v))
+			case fieldnum.FieldDescriptorProto_DefaultValue:
+				fd.L1.Default.val = pref.ValueOfBytes(v) // temporarily store as bytes; later resolved in resolveMessages
+			case fieldnum.FieldDescriptorProto_TypeName:
+				rawTypeName = v
+			case fieldnum.FieldDescriptorProto_Options:
+				fd.unmarshalOptions(v)
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	if rawTypeName != nil {
+		name := makeFullName(sb, rawTypeName)
+		switch fd.L1.Kind {
+		case pref.EnumKind:
+			fd.L1.Enum = PlaceholderEnum(name)
+		case pref.MessageKind, pref.GroupKind:
+			fd.L1.Message = PlaceholderMessage(name)
+		}
+	}
+	fd.L1.Options = pf.builder.optionsUnmarshaler(&descopts.Field, rawOptions)
+}
+
+func (fd *Field) unmarshalOptions(b []byte) {
+	const FieldOptions_EnforceUTF8 = 13
+
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldOptions_Packed:
+				fd.L1.HasPacked = true
+				fd.L1.IsPacked = protowire.DecodeBool(v)
+			case fieldnum.FieldOptions_Weak:
+				fd.L1.IsWeak = protowire.DecodeBool(v)
+			case FieldOptions_EnforceUTF8:
+				fd.L1.HasEnforceUTF8 = true
+				fd.L1.EnforceUTF8 = protowire.DecodeBool(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func (od *Oneof) unmarshalFull(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	od.L0.ParentFile = pf
+	od.L0.Parent = pd
+	od.L0.Index = i
+
+	var rawOptions []byte
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.OneofDescriptorProto_Name:
+				od.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.OneofDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	od.L1.Options = pf.builder.optionsUnmarshaler(&descopts.Oneof, rawOptions)
+}
+
+func (xd *Extension) unmarshalFull(b []byte, sb *strs.Builder) {
+	var rawTypeName []byte
+	var rawOptions []byte
+	xd.L2 = new(ExtensionL2)
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Proto3Optional:
+				xd.L2.IsProto3Optional = protowire.DecodeBool(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_JsonName:
+				xd.L2.JSONName.Init(sb.MakeString(v))
+			case fieldnum.FieldDescriptorProto_DefaultValue:
+				xd.L2.Default.val = pref.ValueOfBytes(v) // temporarily store as bytes; later resolved in resolveExtensions
+			case fieldnum.FieldDescriptorProto_TypeName:
+				rawTypeName = v
+			case fieldnum.FieldDescriptorProto_Options:
+				xd.unmarshalOptions(v)
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	if rawTypeName != nil {
+		name := makeFullName(sb, rawTypeName)
+		switch xd.L1.Kind {
+		case pref.EnumKind:
+			xd.L2.Enum = PlaceholderEnum(name)
+		case pref.MessageKind, pref.GroupKind:
+			xd.L2.Message = PlaceholderMessage(name)
+		}
+	}
+	xd.L2.Options = xd.L0.ParentFile.builder.optionsUnmarshaler(&descopts.Field, rawOptions)
+}
+
+func (xd *Extension) unmarshalOptions(b []byte) {
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldOptions_Packed:
+				xd.L2.IsPacked = protowire.DecodeBool(v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+}
+
+func (sd *Service) unmarshalFull(b []byte, sb *strs.Builder) {
+	var rawMethods [][]byte
+	var rawOptions []byte
+	sd.L2 = new(ServiceL2)
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.ServiceDescriptorProto_Method:
+				rawMethods = append(rawMethods, v)
+			case fieldnum.ServiceDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	if len(rawMethods) > 0 {
+		sd.L2.Methods.List = make([]Method, len(rawMethods))
+		for i, b := range rawMethods {
+			sd.L2.Methods.List[i].unmarshalFull(b, sb, sd.L0.ParentFile, sd, i)
+		}
+	}
+	sd.L2.Options = sd.L0.ParentFile.builder.optionsUnmarshaler(&descopts.Service, rawOptions)
+}
+
+func (md *Method) unmarshalFull(b []byte, sb *strs.Builder, pf *File, pd pref.Descriptor, i int) {
+	md.L0.ParentFile = pf
+	md.L0.Parent = pd
+	md.L0.Index = i
+
+	var rawOptions []byte
+	for len(b) > 0 {
+		num, typ, n := protowire.ConsumeTag(b)
+		b = b[n:]
+		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.MethodDescriptorProto_ClientStreaming:
+				md.L1.IsStreamingClient = protowire.DecodeBool(v)
+			case fieldnum.MethodDescriptorProto_ServerStreaming:
+				md.L1.IsStreamingServer = protowire.DecodeBool(v)
+			}
+		case protowire.BytesType:
+			v, m := protowire.ConsumeBytes(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.MethodDescriptorProto_Name:
+				md.L0.FullName = appendFullName(sb, pd.FullName(), v)
+			case fieldnum.MethodDescriptorProto_InputType:
+				md.L1.Input = PlaceholderMessage(makeFullName(sb, v))
+			case fieldnum.MethodDescriptorProto_OutputType:
+				md.L1.Output = PlaceholderMessage(makeFullName(sb, v))
+			case fieldnum.MethodDescriptorProto_Options:
+				rawOptions = appendOptions(rawOptions, v)
+			}
+		default:
+			m := protowire.ConsumeFieldValue(num, typ, b)
+			b = b[m:]
+		}
+	}
+	md.L1.Options = pf.builder.optionsUnmarshaler(&descopts.Method, rawOptions)
+}
+
+// appendOptions appends src to dst, where the returned slice is never nil.
+// This is necessary to distinguish between empty and unpopulated options.
+func appendOptions(dst, src []byte) []byte {
+	if dst == nil {
+		dst = []byte{}
+	}
+	return append(dst, src...)
+}
+
+// optionsUnmarshaler constructs a lazy unmarshal function for an options message.
+//
+// The type of message to unmarshal to is passed as a pointer since the
+// vars in descopts may not yet be populated at the time this function is called.
+func (db *Builder) optionsUnmarshaler(p *pref.ProtoMessage, b []byte) func() pref.ProtoMessage {
+	if b == nil {
+		return nil
+	}
+	var opts pref.ProtoMessage
+	var once sync.Once
+	return func() pref.ProtoMessage {
+		once.Do(func() {
+			if *p == nil {
+				panic("Descriptor.Options called without importing the descriptor package")
+			}
+			opts = reflect.New(reflect.TypeOf(*p).Elem()).Interface().(pref.ProtoMessage)
+			if err := (proto.UnmarshalOptions{
+				AllowPartial: true,
+				Resolver:     db.TypeResolver,
+			}).Unmarshal(b, opts); err != nil {
+				panic(err)
+			}
+		})
+		return opts
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/desc_list.go b/vendor/google.golang.org/protobuf/internal/filedesc/desc_list.go
new file mode 100644
index 0000000..1b7089b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/desc_list.go
@@ -0,0 +1,286 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filedesc
+
+import (
+	"fmt"
+	"math"
+	"sort"
+	"sync"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/descfmt"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type FileImports []pref.FileImport
+
+func (p *FileImports) Len() int                            { return len(*p) }
+func (p *FileImports) Get(i int) pref.FileImport           { return (*p)[i] }
+func (p *FileImports) Format(s fmt.State, r rune)          { descfmt.FormatList(s, r, p) }
+func (p *FileImports) ProtoInternal(pragma.DoNotImplement) {}
+
+type Names struct {
+	List []pref.Name
+	once sync.Once
+	has  map[pref.Name]int // protected by once
+}
+
+func (p *Names) Len() int                            { return len(p.List) }
+func (p *Names) Get(i int) pref.Name                 { return p.List[i] }
+func (p *Names) Has(s pref.Name) bool                { return p.lazyInit().has[s] > 0 }
+func (p *Names) Format(s fmt.State, r rune)          { descfmt.FormatList(s, r, p) }
+func (p *Names) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Names) lazyInit() *Names {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.has = make(map[pref.Name]int, len(p.List))
+			for _, s := range p.List {
+				p.has[s] = p.has[s] + 1
+			}
+		}
+	})
+	return p
+}
+
+// CheckValid reports any errors with the set of names with an error message
+// that completes the sentence: "ranges is invalid because it has ..."
+func (p *Names) CheckValid() error {
+	for s, n := range p.lazyInit().has {
+		switch {
+		case n > 1:
+			return errors.New("duplicate name: %q", s)
+		case false && !s.IsValid():
+			// NOTE: The C++ implementation does not validate the identifier.
+			// See https://github.com/protocolbuffers/protobuf/issues/6335.
+			return errors.New("invalid name: %q", s)
+		}
+	}
+	return nil
+}
+
+type EnumRanges struct {
+	List   [][2]pref.EnumNumber // start inclusive; end inclusive
+	once   sync.Once
+	sorted [][2]pref.EnumNumber // protected by once
+}
+
+func (p *EnumRanges) Len() int                     { return len(p.List) }
+func (p *EnumRanges) Get(i int) [2]pref.EnumNumber { return p.List[i] }
+func (p *EnumRanges) Has(n pref.EnumNumber) bool {
+	for ls := p.lazyInit().sorted; len(ls) > 0; {
+		i := len(ls) / 2
+		switch r := enumRange(ls[i]); {
+		case n < r.Start():
+			ls = ls[:i] // search lower
+		case n > r.End():
+			ls = ls[i+1:] // search upper
+		default:
+			return true
+		}
+	}
+	return false
+}
+func (p *EnumRanges) Format(s fmt.State, r rune)          { descfmt.FormatList(s, r, p) }
+func (p *EnumRanges) ProtoInternal(pragma.DoNotImplement) {}
+func (p *EnumRanges) lazyInit() *EnumRanges {
+	p.once.Do(func() {
+		p.sorted = append(p.sorted, p.List...)
+		sort.Slice(p.sorted, func(i, j int) bool {
+			return p.sorted[i][0] < p.sorted[j][0]
+		})
+	})
+	return p
+}
+
+// CheckValid reports any errors with the set of names with an error message
+// that completes the sentence: "ranges is invalid because it has ..."
+func (p *EnumRanges) CheckValid() error {
+	var rp enumRange
+	for i, r := range p.lazyInit().sorted {
+		r := enumRange(r)
+		switch {
+		case !(r.Start() <= r.End()):
+			return errors.New("invalid range: %v", r)
+		case !(rp.End() < r.Start()) && i > 0:
+			return errors.New("overlapping ranges: %v with %v", rp, r)
+		}
+		rp = r
+	}
+	return nil
+}
+
+type enumRange [2]protoreflect.EnumNumber
+
+func (r enumRange) Start() protoreflect.EnumNumber { return r[0] } // inclusive
+func (r enumRange) End() protoreflect.EnumNumber   { return r[1] } // inclusive
+func (r enumRange) String() string {
+	if r.Start() == r.End() {
+		return fmt.Sprintf("%d", r.Start())
+	}
+	return fmt.Sprintf("%d to %d", r.Start(), r.End())
+}
+
+type FieldRanges struct {
+	List   [][2]pref.FieldNumber // start inclusive; end exclusive
+	once   sync.Once
+	sorted [][2]pref.FieldNumber // protected by once
+}
+
+func (p *FieldRanges) Len() int                      { return len(p.List) }
+func (p *FieldRanges) Get(i int) [2]pref.FieldNumber { return p.List[i] }
+func (p *FieldRanges) Has(n pref.FieldNumber) bool {
+	for ls := p.lazyInit().sorted; len(ls) > 0; {
+		i := len(ls) / 2
+		switch r := fieldRange(ls[i]); {
+		case n < r.Start():
+			ls = ls[:i] // search lower
+		case n > r.End():
+			ls = ls[i+1:] // search upper
+		default:
+			return true
+		}
+	}
+	return false
+}
+func (p *FieldRanges) Format(s fmt.State, r rune)          { descfmt.FormatList(s, r, p) }
+func (p *FieldRanges) ProtoInternal(pragma.DoNotImplement) {}
+func (p *FieldRanges) lazyInit() *FieldRanges {
+	p.once.Do(func() {
+		p.sorted = append(p.sorted, p.List...)
+		sort.Slice(p.sorted, func(i, j int) bool {
+			return p.sorted[i][0] < p.sorted[j][0]
+		})
+	})
+	return p
+}
+
+// CheckValid reports any errors with the set of ranges with an error message
+// that completes the sentence: "ranges is invalid because it has ..."
+func (p *FieldRanges) CheckValid(isMessageSet bool) error {
+	var rp fieldRange
+	for i, r := range p.lazyInit().sorted {
+		r := fieldRange(r)
+		switch {
+		case !isValidFieldNumber(r.Start(), isMessageSet):
+			return errors.New("invalid field number: %d", r.Start())
+		case !isValidFieldNumber(r.End(), isMessageSet):
+			return errors.New("invalid field number: %d", r.End())
+		case !(r.Start() <= r.End()):
+			return errors.New("invalid range: %v", r)
+		case !(rp.End() < r.Start()) && i > 0:
+			return errors.New("overlapping ranges: %v with %v", rp, r)
+		}
+		rp = r
+	}
+	return nil
+}
+
+// isValidFieldNumber reports whether the field number is valid.
+// Unlike the FieldNumber.IsValid method, it allows ranges that cover the
+// reserved number range.
+func isValidFieldNumber(n protoreflect.FieldNumber, isMessageSet bool) bool {
+	if isMessageSet {
+		return protowire.MinValidNumber <= n && n <= math.MaxInt32
+	}
+	return protowire.MinValidNumber <= n && n <= protowire.MaxValidNumber
+}
+
+// CheckOverlap reports an error if p and q overlap.
+func (p *FieldRanges) CheckOverlap(q *FieldRanges) error {
+	rps := p.lazyInit().sorted
+	rqs := q.lazyInit().sorted
+	for pi, qi := 0, 0; pi < len(rps) && qi < len(rqs); {
+		rp := fieldRange(rps[pi])
+		rq := fieldRange(rqs[qi])
+		if !(rp.End() < rq.Start() || rq.End() < rp.Start()) {
+			return errors.New("overlapping ranges: %v with %v", rp, rq)
+		}
+		if rp.Start() < rq.Start() {
+			pi++
+		} else {
+			qi++
+		}
+	}
+	return nil
+}
+
+type fieldRange [2]protoreflect.FieldNumber
+
+func (r fieldRange) Start() protoreflect.FieldNumber { return r[0] }     // inclusive
+func (r fieldRange) End() protoreflect.FieldNumber   { return r[1] - 1 } // inclusive
+func (r fieldRange) String() string {
+	if r.Start() == r.End() {
+		return fmt.Sprintf("%d", r.Start())
+	}
+	return fmt.Sprintf("%d to %d", r.Start(), r.End())
+}
+
+type FieldNumbers struct {
+	List []pref.FieldNumber
+	once sync.Once
+	has  map[pref.FieldNumber]struct{} // protected by once
+}
+
+func (p *FieldNumbers) Len() int                   { return len(p.List) }
+func (p *FieldNumbers) Get(i int) pref.FieldNumber { return p.List[i] }
+func (p *FieldNumbers) Has(n pref.FieldNumber) bool {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.has = make(map[pref.FieldNumber]struct{}, len(p.List))
+			for _, n := range p.List {
+				p.has[n] = struct{}{}
+			}
+		}
+	})
+	_, ok := p.has[n]
+	return ok
+}
+func (p *FieldNumbers) Format(s fmt.State, r rune)          { descfmt.FormatList(s, r, p) }
+func (p *FieldNumbers) ProtoInternal(pragma.DoNotImplement) {}
+
+type OneofFields struct {
+	List   []pref.FieldDescriptor
+	once   sync.Once
+	byName map[pref.Name]pref.FieldDescriptor        // protected by once
+	byJSON map[string]pref.FieldDescriptor           // protected by once
+	byNum  map[pref.FieldNumber]pref.FieldDescriptor // protected by once
+}
+
+func (p *OneofFields) Len() int                                         { return len(p.List) }
+func (p *OneofFields) Get(i int) pref.FieldDescriptor                   { return p.List[i] }
+func (p *OneofFields) ByName(s pref.Name) pref.FieldDescriptor          { return p.lazyInit().byName[s] }
+func (p *OneofFields) ByJSONName(s string) pref.FieldDescriptor         { return p.lazyInit().byJSON[s] }
+func (p *OneofFields) ByNumber(n pref.FieldNumber) pref.FieldDescriptor { return p.lazyInit().byNum[n] }
+func (p *OneofFields) Format(s fmt.State, r rune)                       { descfmt.FormatList(s, r, p) }
+func (p *OneofFields) ProtoInternal(pragma.DoNotImplement)              {}
+
+func (p *OneofFields) lazyInit() *OneofFields {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[pref.Name]pref.FieldDescriptor, len(p.List))
+			p.byJSON = make(map[string]pref.FieldDescriptor, len(p.List))
+			p.byNum = make(map[pref.FieldNumber]pref.FieldDescriptor, len(p.List))
+			for _, f := range p.List {
+				// Field names and numbers are guaranteed to be unique.
+				p.byName[f.Name()] = f
+				p.byJSON[f.JSONName()] = f
+				p.byNum[f.Number()] = f
+			}
+		}
+	})
+	return p
+}
+
+type SourceLocations struct {
+	List []pref.SourceLocation
+}
+
+func (p *SourceLocations) Len() int                            { return len(p.List) }
+func (p *SourceLocations) Get(i int) pref.SourceLocation       { return p.List[i] }
+func (p *SourceLocations) ProtoInternal(pragma.DoNotImplement) {}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/desc_list_gen.go b/vendor/google.golang.org/protobuf/internal/filedesc/desc_list_gen.go
new file mode 100644
index 0000000..6a8825e
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/desc_list_gen.go
@@ -0,0 +1,345 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package filedesc
+
+import (
+	"fmt"
+	"sync"
+
+	"google.golang.org/protobuf/internal/descfmt"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type Enums struct {
+	List   []Enum
+	once   sync.Once
+	byName map[protoreflect.Name]*Enum // protected by once
+}
+
+func (p *Enums) Len() int {
+	return len(p.List)
+}
+func (p *Enums) Get(i int) protoreflect.EnumDescriptor {
+	return &p.List[i]
+}
+func (p *Enums) ByName(s protoreflect.Name) protoreflect.EnumDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Enums) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Enums) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Enums) lazyInit() *Enums {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Enum, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type EnumValues struct {
+	List   []EnumValue
+	once   sync.Once
+	byName map[protoreflect.Name]*EnumValue       // protected by once
+	byNum  map[protoreflect.EnumNumber]*EnumValue // protected by once
+}
+
+func (p *EnumValues) Len() int {
+	return len(p.List)
+}
+func (p *EnumValues) Get(i int) protoreflect.EnumValueDescriptor {
+	return &p.List[i]
+}
+func (p *EnumValues) ByName(s protoreflect.Name) protoreflect.EnumValueDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *EnumValues) ByNumber(n protoreflect.EnumNumber) protoreflect.EnumValueDescriptor {
+	if d := p.lazyInit().byNum[n]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *EnumValues) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *EnumValues) ProtoInternal(pragma.DoNotImplement) {}
+func (p *EnumValues) lazyInit() *EnumValues {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*EnumValue, len(p.List))
+			p.byNum = make(map[protoreflect.EnumNumber]*EnumValue, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+				if _, ok := p.byNum[d.Number()]; !ok {
+					p.byNum[d.Number()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Messages struct {
+	List   []Message
+	once   sync.Once
+	byName map[protoreflect.Name]*Message // protected by once
+}
+
+func (p *Messages) Len() int {
+	return len(p.List)
+}
+func (p *Messages) Get(i int) protoreflect.MessageDescriptor {
+	return &p.List[i]
+}
+func (p *Messages) ByName(s protoreflect.Name) protoreflect.MessageDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Messages) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Messages) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Messages) lazyInit() *Messages {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Message, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Fields struct {
+	List   []Field
+	once   sync.Once
+	byName map[protoreflect.Name]*Field        // protected by once
+	byJSON map[string]*Field                   // protected by once
+	byNum  map[protoreflect.FieldNumber]*Field // protected by once
+}
+
+func (p *Fields) Len() int {
+	return len(p.List)
+}
+func (p *Fields) Get(i int) protoreflect.FieldDescriptor {
+	return &p.List[i]
+}
+func (p *Fields) ByName(s protoreflect.Name) protoreflect.FieldDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Fields) ByJSONName(s string) protoreflect.FieldDescriptor {
+	if d := p.lazyInit().byJSON[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Fields) ByNumber(n protoreflect.FieldNumber) protoreflect.FieldDescriptor {
+	if d := p.lazyInit().byNum[n]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Fields) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Fields) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Fields) lazyInit() *Fields {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Field, len(p.List))
+			p.byJSON = make(map[string]*Field, len(p.List))
+			p.byNum = make(map[protoreflect.FieldNumber]*Field, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+				if _, ok := p.byJSON[d.JSONName()]; !ok {
+					p.byJSON[d.JSONName()] = d
+				}
+				if _, ok := p.byNum[d.Number()]; !ok {
+					p.byNum[d.Number()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Oneofs struct {
+	List   []Oneof
+	once   sync.Once
+	byName map[protoreflect.Name]*Oneof // protected by once
+}
+
+func (p *Oneofs) Len() int {
+	return len(p.List)
+}
+func (p *Oneofs) Get(i int) protoreflect.OneofDescriptor {
+	return &p.List[i]
+}
+func (p *Oneofs) ByName(s protoreflect.Name) protoreflect.OneofDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Oneofs) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Oneofs) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Oneofs) lazyInit() *Oneofs {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Oneof, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Extensions struct {
+	List   []Extension
+	once   sync.Once
+	byName map[protoreflect.Name]*Extension // protected by once
+}
+
+func (p *Extensions) Len() int {
+	return len(p.List)
+}
+func (p *Extensions) Get(i int) protoreflect.ExtensionDescriptor {
+	return &p.List[i]
+}
+func (p *Extensions) ByName(s protoreflect.Name) protoreflect.ExtensionDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Extensions) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Extensions) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Extensions) lazyInit() *Extensions {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Extension, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Services struct {
+	List   []Service
+	once   sync.Once
+	byName map[protoreflect.Name]*Service // protected by once
+}
+
+func (p *Services) Len() int {
+	return len(p.List)
+}
+func (p *Services) Get(i int) protoreflect.ServiceDescriptor {
+	return &p.List[i]
+}
+func (p *Services) ByName(s protoreflect.Name) protoreflect.ServiceDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Services) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Services) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Services) lazyInit() *Services {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Service, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
+
+type Methods struct {
+	List   []Method
+	once   sync.Once
+	byName map[protoreflect.Name]*Method // protected by once
+}
+
+func (p *Methods) Len() int {
+	return len(p.List)
+}
+func (p *Methods) Get(i int) protoreflect.MethodDescriptor {
+	return &p.List[i]
+}
+func (p *Methods) ByName(s protoreflect.Name) protoreflect.MethodDescriptor {
+	if d := p.lazyInit().byName[s]; d != nil {
+		return d
+	}
+	return nil
+}
+func (p *Methods) Format(s fmt.State, r rune) {
+	descfmt.FormatList(s, r, p)
+}
+func (p *Methods) ProtoInternal(pragma.DoNotImplement) {}
+func (p *Methods) lazyInit() *Methods {
+	p.once.Do(func() {
+		if len(p.List) > 0 {
+			p.byName = make(map[protoreflect.Name]*Method, len(p.List))
+			for i := range p.List {
+				d := &p.List[i]
+				if _, ok := p.byName[d.Name()]; !ok {
+					p.byName[d.Name()] = d
+				}
+			}
+		}
+	})
+	return p
+}
diff --git a/vendor/google.golang.org/protobuf/internal/filedesc/placeholder.go b/vendor/google.golang.org/protobuf/internal/filedesc/placeholder.go
new file mode 100644
index 0000000..dbf2c60
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filedesc/placeholder.go
@@ -0,0 +1,107 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filedesc
+
+import (
+	"google.golang.org/protobuf/internal/descopts"
+	"google.golang.org/protobuf/internal/pragma"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+var (
+	emptyNames           = new(Names)
+	emptyEnumRanges      = new(EnumRanges)
+	emptyFieldRanges     = new(FieldRanges)
+	emptyFieldNumbers    = new(FieldNumbers)
+	emptySourceLocations = new(SourceLocations)
+
+	emptyFiles      = new(FileImports)
+	emptyMessages   = new(Messages)
+	emptyFields     = new(Fields)
+	emptyOneofs     = new(Oneofs)
+	emptyEnums      = new(Enums)
+	emptyEnumValues = new(EnumValues)
+	emptyExtensions = new(Extensions)
+	emptyServices   = new(Services)
+)
+
+// PlaceholderFile is a placeholder, representing only the file path.
+type PlaceholderFile string
+
+func (f PlaceholderFile) ParentFile() pref.FileDescriptor       { return f }
+func (f PlaceholderFile) Parent() pref.Descriptor               { return nil }
+func (f PlaceholderFile) Index() int                            { return 0 }
+func (f PlaceholderFile) Syntax() pref.Syntax                   { return 0 }
+func (f PlaceholderFile) Name() pref.Name                       { return "" }
+func (f PlaceholderFile) FullName() pref.FullName               { return "" }
+func (f PlaceholderFile) IsPlaceholder() bool                   { return true }
+func (f PlaceholderFile) Options() pref.ProtoMessage            { return descopts.File }
+func (f PlaceholderFile) Path() string                          { return string(f) }
+func (f PlaceholderFile) Package() pref.FullName                { return "" }
+func (f PlaceholderFile) Imports() pref.FileImports             { return emptyFiles }
+func (f PlaceholderFile) Messages() pref.MessageDescriptors     { return emptyMessages }
+func (f PlaceholderFile) Enums() pref.EnumDescriptors           { return emptyEnums }
+func (f PlaceholderFile) Extensions() pref.ExtensionDescriptors { return emptyExtensions }
+func (f PlaceholderFile) Services() pref.ServiceDescriptors     { return emptyServices }
+func (f PlaceholderFile) SourceLocations() pref.SourceLocations { return emptySourceLocations }
+func (f PlaceholderFile) ProtoType(pref.FileDescriptor)         { return }
+func (f PlaceholderFile) ProtoInternal(pragma.DoNotImplement)   { return }
+
+// PlaceholderEnum is a placeholder, representing only the full name.
+type PlaceholderEnum pref.FullName
+
+func (e PlaceholderEnum) ParentFile() pref.FileDescriptor     { return nil }
+func (e PlaceholderEnum) Parent() pref.Descriptor             { return nil }
+func (e PlaceholderEnum) Index() int                          { return 0 }
+func (e PlaceholderEnum) Syntax() pref.Syntax                 { return 0 }
+func (e PlaceholderEnum) Name() pref.Name                     { return pref.FullName(e).Name() }
+func (e PlaceholderEnum) FullName() pref.FullName             { return pref.FullName(e) }
+func (e PlaceholderEnum) IsPlaceholder() bool                 { return true }
+func (e PlaceholderEnum) Options() pref.ProtoMessage          { return descopts.Enum }
+func (e PlaceholderEnum) Values() pref.EnumValueDescriptors   { return emptyEnumValues }
+func (e PlaceholderEnum) ReservedNames() pref.Names           { return emptyNames }
+func (e PlaceholderEnum) ReservedRanges() pref.EnumRanges     { return emptyEnumRanges }
+func (e PlaceholderEnum) ProtoType(pref.EnumDescriptor)       { return }
+func (e PlaceholderEnum) ProtoInternal(pragma.DoNotImplement) { return }
+
+// PlaceholderEnumValue is a placeholder, representing only the full name.
+type PlaceholderEnumValue pref.FullName
+
+func (e PlaceholderEnumValue) ParentFile() pref.FileDescriptor     { return nil }
+func (e PlaceholderEnumValue) Parent() pref.Descriptor             { return nil }
+func (e PlaceholderEnumValue) Index() int                          { return 0 }
+func (e PlaceholderEnumValue) Syntax() pref.Syntax                 { return 0 }
+func (e PlaceholderEnumValue) Name() pref.Name                     { return pref.FullName(e).Name() }
+func (e PlaceholderEnumValue) FullName() pref.FullName             { return pref.FullName(e) }
+func (e PlaceholderEnumValue) IsPlaceholder() bool                 { return true }
+func (e PlaceholderEnumValue) Options() pref.ProtoMessage          { return descopts.EnumValue }
+func (e PlaceholderEnumValue) Number() pref.EnumNumber             { return 0 }
+func (e PlaceholderEnumValue) ProtoType(pref.EnumValueDescriptor)  { return }
+func (e PlaceholderEnumValue) ProtoInternal(pragma.DoNotImplement) { return }
+
+// PlaceholderMessage is a placeholder, representing only the full name.
+type PlaceholderMessage pref.FullName
+
+func (m PlaceholderMessage) ParentFile() pref.FileDescriptor             { return nil }
+func (m PlaceholderMessage) Parent() pref.Descriptor                     { return nil }
+func (m PlaceholderMessage) Index() int                                  { return 0 }
+func (m PlaceholderMessage) Syntax() pref.Syntax                         { return 0 }
+func (m PlaceholderMessage) Name() pref.Name                             { return pref.FullName(m).Name() }
+func (m PlaceholderMessage) FullName() pref.FullName                     { return pref.FullName(m) }
+func (m PlaceholderMessage) IsPlaceholder() bool                         { return true }
+func (m PlaceholderMessage) Options() pref.ProtoMessage                  { return descopts.Message }
+func (m PlaceholderMessage) IsMapEntry() bool                            { return false }
+func (m PlaceholderMessage) Fields() pref.FieldDescriptors               { return emptyFields }
+func (m PlaceholderMessage) Oneofs() pref.OneofDescriptors               { return emptyOneofs }
+func (m PlaceholderMessage) ReservedNames() pref.Names                   { return emptyNames }
+func (m PlaceholderMessage) ReservedRanges() pref.FieldRanges            { return emptyFieldRanges }
+func (m PlaceholderMessage) RequiredNumbers() pref.FieldNumbers          { return emptyFieldNumbers }
+func (m PlaceholderMessage) ExtensionRanges() pref.FieldRanges           { return emptyFieldRanges }
+func (m PlaceholderMessage) ExtensionRangeOptions(int) pref.ProtoMessage { panic("index out of range") }
+func (m PlaceholderMessage) Messages() pref.MessageDescriptors           { return emptyMessages }
+func (m PlaceholderMessage) Enums() pref.EnumDescriptors                 { return emptyEnums }
+func (m PlaceholderMessage) Extensions() pref.ExtensionDescriptors       { return emptyExtensions }
+func (m PlaceholderMessage) ProtoType(pref.MessageDescriptor)            { return }
+func (m PlaceholderMessage) ProtoInternal(pragma.DoNotImplement)         { return }
diff --git a/vendor/google.golang.org/protobuf/internal/filetype/build.go b/vendor/google.golang.org/protobuf/internal/filetype/build.go
new file mode 100644
index 0000000..0a0dd35
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/filetype/build.go
@@ -0,0 +1,297 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package filetype provides functionality for wrapping descriptors
+// with Go type information.
+package filetype
+
+import (
+	"reflect"
+
+	"google.golang.org/protobuf/internal/descopts"
+	fdesc "google.golang.org/protobuf/internal/filedesc"
+	pimpl "google.golang.org/protobuf/internal/impl"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// Builder constructs type descriptors from a raw file descriptor
+// and associated Go types for each enum and message declaration.
+//
+//
+// Flattened Ordering
+//
+// The protobuf type system represents declarations as a tree. Certain nodes in
+// the tree require us to either associate it with a concrete Go type or to
+// resolve a dependency, which is information that must be provided separately
+// since it cannot be derived from the file descriptor alone.
+//
+// However, representing a tree as Go literals is difficult to simply do in a
+// space and time efficient way. Thus, we store them as a flattened list of
+// objects where the serialization order from the tree-based form is important.
+//
+// The "flattened ordering" is defined as a tree traversal of all enum, message,
+// extension, and service declarations using the following algorithm:
+//
+//	def VisitFileDecls(fd):
+//		for e in fd.Enums:      yield e
+//		for m in fd.Messages:   yield m
+//		for x in fd.Extensions: yield x
+//		for s in fd.Services:   yield s
+//		for m in fd.Messages:   yield from VisitMessageDecls(m)
+//
+//	def VisitMessageDecls(md):
+//		for e in md.Enums:      yield e
+//		for m in md.Messages:   yield m
+//		for x in md.Extensions: yield x
+//		for m in md.Messages:   yield from VisitMessageDecls(m)
+//
+// The traversal starts at the root file descriptor and yields each direct
+// declaration within each node before traversing into sub-declarations
+// that children themselves may have.
+type Builder struct {
+	// File is the underlying file descriptor builder.
+	File fdesc.Builder
+
+	// GoTypes is a unique set of the Go types for all declarations and
+	// dependencies. Each type is represented as a zero value of the Go type.
+	//
+	// Declarations are Go types generated for enums and messages directly
+	// declared (not publicly imported) in the proto source file.
+	// Messages for map entries are accounted for, but represented by nil.
+	// Enum declarations in "flattened ordering" come first, followed by
+	// message declarations in "flattened ordering".
+	//
+	// Dependencies are Go types for enums or messages referenced by
+	// message fields (excluding weak fields), for parent extended messages of
+	// extension fields, for enums or messages referenced by extension fields,
+	// and for input and output messages referenced by service methods.
+	// Dependencies must come after declarations, but the ordering of
+	// dependencies themselves is unspecified.
+	GoTypes []interface{}
+
+	// DependencyIndexes is an ordered list of indexes into GoTypes for the
+	// dependencies of messages, extensions, or services.
+	//
+	// There are 5 sub-lists in "flattened ordering" concatenated back-to-back:
+	//	0. Message field dependencies: list of the enum or message type
+	//	referred to by every message field.
+	//	1. Extension field targets: list of the extended parent message of
+	//	every extension.
+	//	2. Extension field dependencies: list of the enum or message type
+	//	referred to by every extension field.
+	//	3. Service method inputs: list of the input message type
+	//	referred to by every service method.
+	//	4. Service method outputs: list of the output message type
+	//	referred to by every service method.
+	//
+	// The offset into DependencyIndexes for the start of each sub-list
+	// is appended to the end in reverse order.
+	DependencyIndexes []int32
+
+	// EnumInfos is a list of enum infos in "flattened ordering".
+	EnumInfos []pimpl.EnumInfo
+
+	// MessageInfos is a list of message infos in "flattened ordering".
+	// If provided, the GoType and PBType for each element is populated.
+	//
+	// Requirement: len(MessageInfos) == len(Build.Messages)
+	MessageInfos []pimpl.MessageInfo
+
+	// ExtensionInfos is a list of extension infos in "flattened ordering".
+	// Each element is initialized and registered with the protoregistry package.
+	//
+	// Requirement: len(LegacyExtensions) == len(Build.Extensions)
+	ExtensionInfos []pimpl.ExtensionInfo
+
+	// TypeRegistry is the registry to register each type descriptor.
+	// If nil, it uses protoregistry.GlobalTypes.
+	TypeRegistry interface {
+		RegisterMessage(pref.MessageType) error
+		RegisterEnum(pref.EnumType) error
+		RegisterExtension(pref.ExtensionType) error
+	}
+}
+
+// Out is the output of the builder.
+type Out struct {
+	File pref.FileDescriptor
+}
+
+func (tb Builder) Build() (out Out) {
+	// Replace the resolver with one that resolves dependencies by index,
+	// which is faster and more reliable than relying on the global registry.
+	if tb.File.FileRegistry == nil {
+		tb.File.FileRegistry = preg.GlobalFiles
+	}
+	tb.File.FileRegistry = &resolverByIndex{
+		goTypes:      tb.GoTypes,
+		depIdxs:      tb.DependencyIndexes,
+		fileRegistry: tb.File.FileRegistry,
+	}
+
+	// Initialize registry if unpopulated.
+	if tb.TypeRegistry == nil {
+		tb.TypeRegistry = preg.GlobalTypes
+	}
+
+	fbOut := tb.File.Build()
+	out.File = fbOut.File
+
+	// Process enums.
+	enumGoTypes := tb.GoTypes[:len(fbOut.Enums)]
+	if len(tb.EnumInfos) != len(fbOut.Enums) {
+		panic("mismatching enum lengths")
+	}
+	if len(fbOut.Enums) > 0 {
+		for i := range fbOut.Enums {
+			tb.EnumInfos[i] = pimpl.EnumInfo{
+				GoReflectType: reflect.TypeOf(enumGoTypes[i]),
+				Desc:          &fbOut.Enums[i],
+			}
+			// Register enum types.
+			if err := tb.TypeRegistry.RegisterEnum(&tb.EnumInfos[i]); err != nil {
+				panic(err)
+			}
+		}
+	}
+
+	// Process messages.
+	messageGoTypes := tb.GoTypes[len(fbOut.Enums):][:len(fbOut.Messages)]
+	if len(tb.MessageInfos) != len(fbOut.Messages) {
+		panic("mismatching message lengths")
+	}
+	if len(fbOut.Messages) > 0 {
+		for i := range fbOut.Messages {
+			if messageGoTypes[i] == nil {
+				continue // skip map entry
+			}
+
+			tb.MessageInfos[i].GoReflectType = reflect.TypeOf(messageGoTypes[i])
+			tb.MessageInfos[i].Desc = &fbOut.Messages[i]
+
+			// Register message types.
+			if err := tb.TypeRegistry.RegisterMessage(&tb.MessageInfos[i]); err != nil {
+				panic(err)
+			}
+		}
+
+		// As a special-case for descriptor.proto,
+		// locally register concrete message type for the options.
+		if out.File.Path() == "google/protobuf/descriptor.proto" && out.File.Package() == "google.protobuf" {
+			for i := range fbOut.Messages {
+				switch fbOut.Messages[i].Name() {
+				case "FileOptions":
+					descopts.File = messageGoTypes[i].(pref.ProtoMessage)
+				case "EnumOptions":
+					descopts.Enum = messageGoTypes[i].(pref.ProtoMessage)
+				case "EnumValueOptions":
+					descopts.EnumValue = messageGoTypes[i].(pref.ProtoMessage)
+				case "MessageOptions":
+					descopts.Message = messageGoTypes[i].(pref.ProtoMessage)
+				case "FieldOptions":
+					descopts.Field = messageGoTypes[i].(pref.ProtoMessage)
+				case "OneofOptions":
+					descopts.Oneof = messageGoTypes[i].(pref.ProtoMessage)
+				case "ExtensionRangeOptions":
+					descopts.ExtensionRange = messageGoTypes[i].(pref.ProtoMessage)
+				case "ServiceOptions":
+					descopts.Service = messageGoTypes[i].(pref.ProtoMessage)
+				case "MethodOptions":
+					descopts.Method = messageGoTypes[i].(pref.ProtoMessage)
+				}
+			}
+		}
+	}
+
+	// Process extensions.
+	if len(tb.ExtensionInfos) != len(fbOut.Extensions) {
+		panic("mismatching extension lengths")
+	}
+	var depIdx int32
+	for i := range fbOut.Extensions {
+		// For enum and message kinds, determine the referent Go type so
+		// that we can construct their constructors.
+		const listExtDeps = 2
+		var goType reflect.Type
+		switch fbOut.Extensions[i].L1.Kind {
+		case pref.EnumKind:
+			j := depIdxs.Get(tb.DependencyIndexes, listExtDeps, depIdx)
+			goType = reflect.TypeOf(tb.GoTypes[j])
+			depIdx++
+		case pref.MessageKind, pref.GroupKind:
+			j := depIdxs.Get(tb.DependencyIndexes, listExtDeps, depIdx)
+			goType = reflect.TypeOf(tb.GoTypes[j])
+			depIdx++
+		default:
+			goType = goTypeForPBKind[fbOut.Extensions[i].L1.Kind]
+		}
+		if fbOut.Extensions[i].IsList() {
+			goType = reflect.SliceOf(goType)
+		}
+
+		pimpl.InitExtensionInfo(&tb.ExtensionInfos[i], &fbOut.Extensions[i], goType)
+
+		// Register extension types.
+		if err := tb.TypeRegistry.RegisterExtension(&tb.ExtensionInfos[i]); err != nil {
+			panic(err)
+		}
+	}
+
+	return out
+}
+
+var goTypeForPBKind = map[pref.Kind]reflect.Type{
+	pref.BoolKind:     reflect.TypeOf(bool(false)),
+	pref.Int32Kind:    reflect.TypeOf(int32(0)),
+	pref.Sint32Kind:   reflect.TypeOf(int32(0)),
+	pref.Sfixed32Kind: reflect.TypeOf(int32(0)),
+	pref.Int64Kind:    reflect.TypeOf(int64(0)),
+	pref.Sint64Kind:   reflect.TypeOf(int64(0)),
+	pref.Sfixed64Kind: reflect.TypeOf(int64(0)),
+	pref.Uint32Kind:   reflect.TypeOf(uint32(0)),
+	pref.Fixed32Kind:  reflect.TypeOf(uint32(0)),
+	pref.Uint64Kind:   reflect.TypeOf(uint64(0)),
+	pref.Fixed64Kind:  reflect.TypeOf(uint64(0)),
+	pref.FloatKind:    reflect.TypeOf(float32(0)),
+	pref.DoubleKind:   reflect.TypeOf(float64(0)),
+	pref.StringKind:   reflect.TypeOf(string("")),
+	pref.BytesKind:    reflect.TypeOf([]byte(nil)),
+}
+
+type depIdxs []int32
+
+// Get retrieves the jth element of the ith sub-list.
+func (x depIdxs) Get(i, j int32) int32 {
+	return x[x[int32(len(x))-i-1]+j]
+}
+
+type (
+	resolverByIndex struct {
+		goTypes []interface{}
+		depIdxs depIdxs
+		fileRegistry
+	}
+	fileRegistry interface {
+		FindFileByPath(string) (pref.FileDescriptor, error)
+		FindDescriptorByName(pref.FullName) (pref.Descriptor, error)
+		RegisterFile(pref.FileDescriptor) error
+	}
+)
+
+func (r *resolverByIndex) FindEnumByIndex(i, j int32, es []fdesc.Enum, ms []fdesc.Message) pref.EnumDescriptor {
+	if depIdx := int(r.depIdxs.Get(i, j)); int(depIdx) < len(es)+len(ms) {
+		return &es[depIdx]
+	} else {
+		return pimpl.Export{}.EnumDescriptorOf(r.goTypes[depIdx])
+	}
+}
+
+func (r *resolverByIndex) FindMessageByIndex(i, j int32, es []fdesc.Enum, ms []fdesc.Message) pref.MessageDescriptor {
+	if depIdx := int(r.depIdxs.Get(i, j)); depIdx < len(es)+len(ms) {
+		return &ms[depIdx-len(es)]
+	} else {
+		return pimpl.Export{}.MessageDescriptorOf(r.goTypes[depIdx])
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/flags/flags.go b/vendor/google.golang.org/protobuf/internal/flags/flags.go
new file mode 100644
index 0000000..58372dd
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/flags/flags.go
@@ -0,0 +1,24 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package flags provides a set of flags controlled by build tags.
+package flags
+
+// ProtoLegacy specifies whether to enable support for legacy functionality
+// such as MessageSets, weak fields, and various other obscure behavior
+// that is necessary to maintain backwards compatibility with proto1 or
+// the pre-release variants of proto2 and proto3.
+//
+// This is disabled by default unless built with the "protolegacy" tag.
+//
+// WARNING: The compatibility agreement covers nothing provided by this flag.
+// As such, functionality may suddenly be removed or changed at our discretion.
+const ProtoLegacy = protoLegacy
+
+// LazyUnmarshalExtensions specifies whether to lazily unmarshal extensions.
+//
+// Lazy extension unmarshaling validates the contents of message-valued
+// extension fields at unmarshal time, but defers creating the message
+// structure until the extension is first accessed.
+const LazyUnmarshalExtensions = ProtoLegacy
diff --git a/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_disable.go b/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_disable.go
new file mode 100644
index 0000000..a72995f
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_disable.go
@@ -0,0 +1,9 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !protolegacy
+
+package flags
+
+const protoLegacy = false
diff --git a/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_enable.go b/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_enable.go
new file mode 100644
index 0000000..772e2f0
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/flags/proto_legacy_enable.go
@@ -0,0 +1,9 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build protolegacy
+
+package flags
+
+const protoLegacy = true
diff --git a/vendor/google.golang.org/protobuf/internal/genname/name.go b/vendor/google.golang.org/protobuf/internal/genname/name.go
new file mode 100644
index 0000000..f45509f
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/genname/name.go
@@ -0,0 +1,25 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package genname contains constants for generated names.
+package genname
+
+const (
+	State = "state"
+
+	SizeCache  = "sizeCache"
+	SizeCacheA = "XXX_sizecache"
+
+	WeakFields  = "weakFields"
+	WeakFieldsA = "XXX_weak"
+
+	UnknownFields  = "unknownFields"
+	UnknownFieldsA = "XXX_unrecognized"
+
+	ExtensionFields  = "extensionFields"
+	ExtensionFieldsA = "XXX_InternalExtensions"
+	ExtensionFieldsB = "XXX_extensions"
+
+	WeakFieldPrefix = "XXX_weak_"
+)
diff --git a/vendor/google.golang.org/protobuf/internal/impl/api_export.go b/vendor/google.golang.org/protobuf/internal/impl/api_export.go
new file mode 100644
index 0000000..4d22c96
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/api_export.go
@@ -0,0 +1,170 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+
+	"google.golang.org/protobuf/encoding/prototext"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// Export is a zero-length named type that exists only to export a set of
+// functions that we do not want to appear in godoc.
+type Export struct{}
+
+// enum is any enum type generated by protoc-gen-go
+// and must be a named int32 type.
+type enum = interface{}
+
+// EnumOf returns the protoreflect.Enum interface over e.
+// It returns nil if e is nil.
+func (Export) EnumOf(e enum) pref.Enum {
+	switch e := e.(type) {
+	case nil:
+		return nil
+	case pref.Enum:
+		return e
+	default:
+		return legacyWrapEnum(reflect.ValueOf(e))
+	}
+}
+
+// EnumDescriptorOf returns the protoreflect.EnumDescriptor for e.
+// It returns nil if e is nil.
+func (Export) EnumDescriptorOf(e enum) pref.EnumDescriptor {
+	switch e := e.(type) {
+	case nil:
+		return nil
+	case pref.Enum:
+		return e.Descriptor()
+	default:
+		return LegacyLoadEnumDesc(reflect.TypeOf(e))
+	}
+}
+
+// EnumTypeOf returns the protoreflect.EnumType for e.
+// It returns nil if e is nil.
+func (Export) EnumTypeOf(e enum) pref.EnumType {
+	switch e := e.(type) {
+	case nil:
+		return nil
+	case pref.Enum:
+		return e.Type()
+	default:
+		return legacyLoadEnumType(reflect.TypeOf(e))
+	}
+}
+
+// EnumStringOf returns the enum value as a string, either as the name if
+// the number is resolvable, or the number formatted as a string.
+func (Export) EnumStringOf(ed pref.EnumDescriptor, n pref.EnumNumber) string {
+	ev := ed.Values().ByNumber(n)
+	if ev != nil {
+		return string(ev.Name())
+	}
+	return strconv.Itoa(int(n))
+}
+
+// message is any message type generated by protoc-gen-go
+// and must be a pointer to a named struct type.
+type message = interface{}
+
+// legacyMessageWrapper wraps a v2 message as a v1 message.
+type legacyMessageWrapper struct{ m pref.ProtoMessage }
+
+func (m legacyMessageWrapper) Reset()         { proto.Reset(m.m) }
+func (m legacyMessageWrapper) String() string { return Export{}.MessageStringOf(m.m) }
+func (m legacyMessageWrapper) ProtoMessage()  {}
+
+// ProtoMessageV1Of converts either a v1 or v2 message to a v1 message.
+// It returns nil if m is nil.
+func (Export) ProtoMessageV1Of(m message) piface.MessageV1 {
+	switch mv := m.(type) {
+	case nil:
+		return nil
+	case piface.MessageV1:
+		return mv
+	case unwrapper:
+		return Export{}.ProtoMessageV1Of(mv.protoUnwrap())
+	case pref.ProtoMessage:
+		return legacyMessageWrapper{mv}
+	default:
+		panic(fmt.Sprintf("message %T is neither a v1 or v2 Message", m))
+	}
+}
+
+func (Export) protoMessageV2Of(m message) pref.ProtoMessage {
+	switch mv := m.(type) {
+	case nil:
+		return nil
+	case pref.ProtoMessage:
+		return mv
+	case legacyMessageWrapper:
+		return mv.m
+	case piface.MessageV1:
+		return nil
+	default:
+		panic(fmt.Sprintf("message %T is neither a v1 or v2 Message", m))
+	}
+}
+
+// ProtoMessageV2Of converts either a v1 or v2 message to a v2 message.
+// It returns nil if m is nil.
+func (Export) ProtoMessageV2Of(m message) pref.ProtoMessage {
+	if m == nil {
+		return nil
+	}
+	if mv := (Export{}).protoMessageV2Of(m); mv != nil {
+		return mv
+	}
+	return legacyWrapMessage(reflect.ValueOf(m)).Interface()
+}
+
+// MessageOf returns the protoreflect.Message interface over m.
+// It returns nil if m is nil.
+func (Export) MessageOf(m message) pref.Message {
+	if m == nil {
+		return nil
+	}
+	if mv := (Export{}).protoMessageV2Of(m); mv != nil {
+		return mv.ProtoReflect()
+	}
+	return legacyWrapMessage(reflect.ValueOf(m))
+}
+
+// MessageDescriptorOf returns the protoreflect.MessageDescriptor for m.
+// It returns nil if m is nil.
+func (Export) MessageDescriptorOf(m message) pref.MessageDescriptor {
+	if m == nil {
+		return nil
+	}
+	if mv := (Export{}).protoMessageV2Of(m); mv != nil {
+		return mv.ProtoReflect().Descriptor()
+	}
+	return LegacyLoadMessageDesc(reflect.TypeOf(m))
+}
+
+// MessageTypeOf returns the protoreflect.MessageType for m.
+// It returns nil if m is nil.
+func (Export) MessageTypeOf(m message) pref.MessageType {
+	if m == nil {
+		return nil
+	}
+	if mv := (Export{}).protoMessageV2Of(m); mv != nil {
+		return mv.ProtoReflect().Type()
+	}
+	return legacyLoadMessageInfo(reflect.TypeOf(m), "")
+}
+
+// MessageStringOf returns the message value as a string,
+// which is the message serialized in the protobuf text format.
+func (Export) MessageStringOf(m pref.ProtoMessage) string {
+	return prototext.MarshalOptions{Multiline: false}.Format(m)
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/checkinit.go b/vendor/google.golang.org/protobuf/internal/impl/checkinit.go
new file mode 100644
index 0000000..b82341e
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/checkinit.go
@@ -0,0 +1,141 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"sync"
+
+	"google.golang.org/protobuf/internal/errors"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+func (mi *MessageInfo) checkInitialized(in piface.CheckInitializedInput) (piface.CheckInitializedOutput, error) {
+	var p pointer
+	if ms, ok := in.Message.(*messageState); ok {
+		p = ms.pointer()
+	} else {
+		p = in.Message.(*messageReflectWrapper).pointer()
+	}
+	return piface.CheckInitializedOutput{}, mi.checkInitializedPointer(p)
+}
+
+func (mi *MessageInfo) checkInitializedPointer(p pointer) error {
+	mi.init()
+	if !mi.needsInitCheck {
+		return nil
+	}
+	if p.IsNil() {
+		for _, f := range mi.orderedCoderFields {
+			if f.isRequired {
+				return errors.RequiredNotSet(string(mi.Desc.Fields().ByNumber(f.num).FullName()))
+			}
+		}
+		return nil
+	}
+	if mi.extensionOffset.IsValid() {
+		e := p.Apply(mi.extensionOffset).Extensions()
+		if err := mi.isInitExtensions(e); err != nil {
+			return err
+		}
+	}
+	for _, f := range mi.orderedCoderFields {
+		if !f.isRequired && f.funcs.isInit == nil {
+			continue
+		}
+		fptr := p.Apply(f.offset)
+		if f.isPointer && fptr.Elem().IsNil() {
+			if f.isRequired {
+				return errors.RequiredNotSet(string(mi.Desc.Fields().ByNumber(f.num).FullName()))
+			}
+			continue
+		}
+		if f.funcs.isInit == nil {
+			continue
+		}
+		if err := f.funcs.isInit(fptr, f); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (mi *MessageInfo) isInitExtensions(ext *map[int32]ExtensionField) error {
+	if ext == nil {
+		return nil
+	}
+	for _, x := range *ext {
+		ei := getExtensionFieldInfo(x.Type())
+		if ei.funcs.isInit == nil {
+			continue
+		}
+		v := x.Value()
+		if !v.IsValid() {
+			continue
+		}
+		if err := ei.funcs.isInit(v); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+var (
+	needsInitCheckMu  sync.Mutex
+	needsInitCheckMap sync.Map
+)
+
+// needsInitCheck reports whether a message needs to be checked for partial initialization.
+//
+// It returns true if the message transitively includes any required or extension fields.
+func needsInitCheck(md pref.MessageDescriptor) bool {
+	if v, ok := needsInitCheckMap.Load(md); ok {
+		if has, ok := v.(bool); ok {
+			return has
+		}
+	}
+	needsInitCheckMu.Lock()
+	defer needsInitCheckMu.Unlock()
+	return needsInitCheckLocked(md)
+}
+
+func needsInitCheckLocked(md pref.MessageDescriptor) (has bool) {
+	if v, ok := needsInitCheckMap.Load(md); ok {
+		// If has is true, we've previously determined that this message
+		// needs init checks.
+		//
+		// If has is false, we've previously determined that it can never
+		// be uninitialized.
+		//
+		// If has is not a bool, we've just encountered a cycle in the
+		// message graph. In this case, it is safe to return false: If
+		// the message does have required fields, we'll detect them later
+		// in the graph traversal.
+		has, ok := v.(bool)
+		return ok && has
+	}
+	needsInitCheckMap.Store(md, struct{}{}) // avoid cycles while descending into this message
+	defer func() {
+		needsInitCheckMap.Store(md, has)
+	}()
+	if md.RequiredNumbers().Len() > 0 {
+		return true
+	}
+	if md.ExtensionRanges().Len() > 0 {
+		return true
+	}
+	for i := 0; i < md.Fields().Len(); i++ {
+		fd := md.Fields().Get(i)
+		// Map keys are never messages, so just consider the map value.
+		if fd.IsMap() {
+			fd = fd.MapValue()
+		}
+		fmd := fd.Message()
+		if fmd != nil && needsInitCheckLocked(fmd) {
+			return true
+		}
+	}
+	return false
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go b/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go
new file mode 100644
index 0000000..08d3517
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_extension.go
@@ -0,0 +1,223 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"sync"
+	"sync/atomic"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type extensionFieldInfo struct {
+	wiretag             uint64
+	tagsize             int
+	unmarshalNeedsValue bool
+	funcs               valueCoderFuncs
+	validation          validationInfo
+}
+
+var legacyExtensionFieldInfoCache sync.Map // map[protoreflect.ExtensionType]*extensionFieldInfo
+
+func getExtensionFieldInfo(xt pref.ExtensionType) *extensionFieldInfo {
+	if xi, ok := xt.(*ExtensionInfo); ok {
+		xi.lazyInit()
+		return xi.info
+	}
+	return legacyLoadExtensionFieldInfo(xt)
+}
+
+// legacyLoadExtensionFieldInfo dynamically loads a *ExtensionInfo for xt.
+func legacyLoadExtensionFieldInfo(xt pref.ExtensionType) *extensionFieldInfo {
+	if xi, ok := legacyExtensionFieldInfoCache.Load(xt); ok {
+		return xi.(*extensionFieldInfo)
+	}
+	e := makeExtensionFieldInfo(xt.TypeDescriptor())
+	if e, ok := legacyMessageTypeCache.LoadOrStore(xt, e); ok {
+		return e.(*extensionFieldInfo)
+	}
+	return e
+}
+
+func makeExtensionFieldInfo(xd pref.ExtensionDescriptor) *extensionFieldInfo {
+	var wiretag uint64
+	if !xd.IsPacked() {
+		wiretag = protowire.EncodeTag(xd.Number(), wireTypes[xd.Kind()])
+	} else {
+		wiretag = protowire.EncodeTag(xd.Number(), protowire.BytesType)
+	}
+	e := &extensionFieldInfo{
+		wiretag: wiretag,
+		tagsize: protowire.SizeVarint(wiretag),
+		funcs:   encoderFuncsForValue(xd),
+	}
+	// Does the unmarshal function need a value passed to it?
+	// This is true for composite types, where we pass in a message, list, or map to fill in,
+	// and for enums, where we pass in a prototype value to specify the concrete enum type.
+	switch xd.Kind() {
+	case pref.MessageKind, pref.GroupKind, pref.EnumKind:
+		e.unmarshalNeedsValue = true
+	default:
+		if xd.Cardinality() == pref.Repeated {
+			e.unmarshalNeedsValue = true
+		}
+	}
+	return e
+}
+
+type lazyExtensionValue struct {
+	atomicOnce uint32 // atomically set if value is valid
+	mu         sync.Mutex
+	xi         *extensionFieldInfo
+	value      pref.Value
+	b          []byte
+	fn         func() pref.Value
+}
+
+type ExtensionField struct {
+	typ pref.ExtensionType
+
+	// value is either the value of GetValue,
+	// or a *lazyExtensionValue that then returns the value of GetValue.
+	value pref.Value
+	lazy  *lazyExtensionValue
+}
+
+func (f *ExtensionField) appendLazyBytes(xt pref.ExtensionType, xi *extensionFieldInfo, num protowire.Number, wtyp protowire.Type, b []byte) {
+	if f.lazy == nil {
+		f.lazy = &lazyExtensionValue{xi: xi}
+	}
+	f.typ = xt
+	f.lazy.xi = xi
+	f.lazy.b = protowire.AppendTag(f.lazy.b, num, wtyp)
+	f.lazy.b = append(f.lazy.b, b...)
+}
+
+func (f *ExtensionField) canLazy(xt pref.ExtensionType) bool {
+	if f.typ == nil {
+		return true
+	}
+	if f.typ == xt && f.lazy != nil && atomic.LoadUint32(&f.lazy.atomicOnce) == 0 {
+		return true
+	}
+	return false
+}
+
+func (f *ExtensionField) lazyInit() {
+	f.lazy.mu.Lock()
+	defer f.lazy.mu.Unlock()
+	if atomic.LoadUint32(&f.lazy.atomicOnce) == 1 {
+		return
+	}
+	if f.lazy.xi != nil {
+		b := f.lazy.b
+		val := f.typ.New()
+		for len(b) > 0 {
+			var tag uint64
+			if b[0] < 0x80 {
+				tag = uint64(b[0])
+				b = b[1:]
+			} else if len(b) >= 2 && b[1] < 128 {
+				tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				b = b[2:]
+			} else {
+				var n int
+				tag, n = protowire.ConsumeVarint(b)
+				if n < 0 {
+					panic(errors.New("bad tag in lazy extension decoding"))
+				}
+				b = b[n:]
+			}
+			num := protowire.Number(tag >> 3)
+			wtyp := protowire.Type(tag & 7)
+			var out unmarshalOutput
+			var err error
+			val, out, err = f.lazy.xi.funcs.unmarshal(b, val, num, wtyp, lazyUnmarshalOptions)
+			if err != nil {
+				panic(errors.New("decode failure in lazy extension decoding: %v", err))
+			}
+			b = b[out.n:]
+		}
+		f.lazy.value = val
+	} else {
+		f.lazy.value = f.lazy.fn()
+	}
+	f.lazy.xi = nil
+	f.lazy.fn = nil
+	f.lazy.b = nil
+	atomic.StoreUint32(&f.lazy.atomicOnce, 1)
+}
+
+// Set sets the type and value of the extension field.
+// This must not be called concurrently.
+func (f *ExtensionField) Set(t pref.ExtensionType, v pref.Value) {
+	f.typ = t
+	f.value = v
+	f.lazy = nil
+}
+
+// SetLazy sets the type and a value that is to be lazily evaluated upon first use.
+// This must not be called concurrently.
+func (f *ExtensionField) SetLazy(t pref.ExtensionType, fn func() pref.Value) {
+	f.typ = t
+	f.lazy = &lazyExtensionValue{fn: fn}
+}
+
+// Value returns the value of the extension field.
+// This may be called concurrently.
+func (f *ExtensionField) Value() pref.Value {
+	if f.lazy != nil {
+		if atomic.LoadUint32(&f.lazy.atomicOnce) == 0 {
+			f.lazyInit()
+		}
+		return f.lazy.value
+	}
+	return f.value
+}
+
+// Type returns the type of the extension field.
+// This may be called concurrently.
+func (f ExtensionField) Type() pref.ExtensionType {
+	return f.typ
+}
+
+// IsSet returns whether the extension field is set.
+// This may be called concurrently.
+func (f ExtensionField) IsSet() bool {
+	return f.typ != nil
+}
+
+// IsLazy reports whether a field is lazily encoded.
+// It is exported for testing.
+func IsLazy(m pref.Message, fd pref.FieldDescriptor) bool {
+	var mi *MessageInfo
+	var p pointer
+	switch m := m.(type) {
+	case *messageState:
+		mi = m.messageInfo()
+		p = m.pointer()
+	case *messageReflectWrapper:
+		mi = m.messageInfo()
+		p = m.pointer()
+	default:
+		return false
+	}
+	xd, ok := fd.(pref.ExtensionTypeDescriptor)
+	if !ok {
+		return false
+	}
+	xt := xd.Type()
+	ext := mi.extensionMap(p)
+	if ext == nil {
+		return false
+	}
+	f, ok := (*ext)[int32(fd.Number())]
+	if !ok {
+		return false
+	}
+	return f.typ == xt && f.lazy != nil && atomic.LoadUint32(&f.lazy.atomicOnce) == 0
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_field.go b/vendor/google.golang.org/protobuf/internal/impl/codec_field.go
new file mode 100644
index 0000000..c00744d
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_field.go
@@ -0,0 +1,828 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"sync"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+type errInvalidUTF8 struct{}
+
+func (errInvalidUTF8) Error() string     { return "string field contains invalid UTF-8" }
+func (errInvalidUTF8) InvalidUTF8() bool { return true }
+
+// initOneofFieldCoders initializes the fast-path functions for the fields in a oneof.
+//
+// For size, marshal, and isInit operations, functions are set only on the first field
+// in the oneof. The functions are called when the oneof is non-nil, and will dispatch
+// to the appropriate field-specific function as necessary.
+//
+// The unmarshal function is set on each field individually as usual.
+func (mi *MessageInfo) initOneofFieldCoders(od pref.OneofDescriptor, si structInfo) {
+	fs := si.oneofsByName[od.Name()]
+	ft := fs.Type
+	oneofFields := make(map[reflect.Type]*coderFieldInfo)
+	needIsInit := false
+	fields := od.Fields()
+	for i, lim := 0, fields.Len(); i < lim; i++ {
+		fd := od.Fields().Get(i)
+		num := fd.Number()
+		// Make a copy of the original coderFieldInfo for use in unmarshaling.
+		//
+		// oneofFields[oneofType].funcs.marshal is the field-specific marshal function.
+		//
+		// mi.coderFields[num].marshal is set on only the first field in the oneof,
+		// and dispatches to the field-specific marshaler in oneofFields.
+		cf := *mi.coderFields[num]
+		ot := si.oneofWrappersByNumber[num]
+		cf.ft = ot.Field(0).Type
+		cf.mi, cf.funcs = fieldCoder(fd, cf.ft)
+		oneofFields[ot] = &cf
+		if cf.funcs.isInit != nil {
+			needIsInit = true
+		}
+		mi.coderFields[num].funcs.unmarshal = func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+			var vw reflect.Value         // pointer to wrapper type
+			vi := p.AsValueOf(ft).Elem() // oneof field value of interface kind
+			if !vi.IsNil() && !vi.Elem().IsNil() && vi.Elem().Elem().Type() == ot {
+				vw = vi.Elem()
+			} else {
+				vw = reflect.New(ot)
+			}
+			out, err := cf.funcs.unmarshal(b, pointerOfValue(vw).Apply(zeroOffset), wtyp, &cf, opts)
+			if err != nil {
+				return out, err
+			}
+			vi.Set(vw)
+			return out, nil
+		}
+	}
+	getInfo := func(p pointer) (pointer, *coderFieldInfo) {
+		v := p.AsValueOf(ft).Elem()
+		if v.IsNil() {
+			return pointer{}, nil
+		}
+		v = v.Elem() // interface -> *struct
+		if v.IsNil() {
+			return pointer{}, nil
+		}
+		return pointerOfValue(v).Apply(zeroOffset), oneofFields[v.Elem().Type()]
+	}
+	first := mi.coderFields[od.Fields().Get(0).Number()]
+	first.funcs.size = func(p pointer, _ *coderFieldInfo, opts marshalOptions) int {
+		p, info := getInfo(p)
+		if info == nil || info.funcs.size == nil {
+			return 0
+		}
+		return info.funcs.size(p, info, opts)
+	}
+	first.funcs.marshal = func(b []byte, p pointer, _ *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+		p, info := getInfo(p)
+		if info == nil || info.funcs.marshal == nil {
+			return b, nil
+		}
+		return info.funcs.marshal(b, p, info, opts)
+	}
+	first.funcs.merge = func(dst, src pointer, _ *coderFieldInfo, opts mergeOptions) {
+		srcp, srcinfo := getInfo(src)
+		if srcinfo == nil || srcinfo.funcs.merge == nil {
+			return
+		}
+		dstp, dstinfo := getInfo(dst)
+		if dstinfo != srcinfo {
+			dst.AsValueOf(ft).Elem().Set(reflect.New(src.AsValueOf(ft).Elem().Elem().Elem().Type()))
+			dstp = pointerOfValue(dst.AsValueOf(ft).Elem().Elem()).Apply(zeroOffset)
+		}
+		srcinfo.funcs.merge(dstp, srcp, srcinfo, opts)
+	}
+	if needIsInit {
+		first.funcs.isInit = func(p pointer, _ *coderFieldInfo) error {
+			p, info := getInfo(p)
+			if info == nil || info.funcs.isInit == nil {
+				return nil
+			}
+			return info.funcs.isInit(p, info)
+		}
+	}
+}
+
+func makeWeakMessageFieldCoder(fd pref.FieldDescriptor) pointerCoderFuncs {
+	var once sync.Once
+	var messageType pref.MessageType
+	lazyInit := func() {
+		once.Do(func() {
+			messageName := fd.Message().FullName()
+			messageType, _ = preg.GlobalTypes.FindMessageByName(messageName)
+		})
+	}
+
+	return pointerCoderFuncs{
+		size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+			m, ok := p.WeakFields().get(f.num)
+			if !ok {
+				return 0
+			}
+			lazyInit()
+			if messageType == nil {
+				panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
+			}
+			return sizeMessage(m, f.tagsize, opts)
+		},
+		marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+			m, ok := p.WeakFields().get(f.num)
+			if !ok {
+				return b, nil
+			}
+			lazyInit()
+			if messageType == nil {
+				panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
+			}
+			return appendMessage(b, m, f.wiretag, opts)
+		},
+		unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+			fs := p.WeakFields()
+			m, ok := fs.get(f.num)
+			if !ok {
+				lazyInit()
+				if messageType == nil {
+					return unmarshalOutput{}, errUnknown
+				}
+				m = messageType.New().Interface()
+				fs.set(f.num, m)
+			}
+			return consumeMessage(b, m, wtyp, opts)
+		},
+		isInit: func(p pointer, f *coderFieldInfo) error {
+			m, ok := p.WeakFields().get(f.num)
+			if !ok {
+				return nil
+			}
+			return proto.CheckInitialized(m)
+		},
+		merge: func(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+			sm, ok := src.WeakFields().get(f.num)
+			if !ok {
+				return
+			}
+			dm, ok := dst.WeakFields().get(f.num)
+			if !ok {
+				lazyInit()
+				if messageType == nil {
+					panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
+				}
+				dm = messageType.New().Interface()
+				dst.WeakFields().set(f.num, dm)
+			}
+			opts.Merge(dm, sm)
+		},
+	}
+}
+
+func makeMessageFieldCoder(fd pref.FieldDescriptor, ft reflect.Type) pointerCoderFuncs {
+	if mi := getMessageInfo(ft); mi != nil {
+		funcs := pointerCoderFuncs{
+			size:      sizeMessageInfo,
+			marshal:   appendMessageInfo,
+			unmarshal: consumeMessageInfo,
+			merge:     mergeMessage,
+		}
+		if needsInitCheck(mi.Desc) {
+			funcs.isInit = isInitMessageInfo
+		}
+		return funcs
+	} else {
+		return pointerCoderFuncs{
+			size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return sizeMessage(m, f.tagsize, opts)
+			},
+			marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return appendMessage(b, m, f.wiretag, opts)
+			},
+			unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+				mp := p.AsValueOf(ft).Elem()
+				if mp.IsNil() {
+					mp.Set(reflect.New(ft.Elem()))
+				}
+				return consumeMessage(b, asMessage(mp), wtyp, opts)
+			},
+			isInit: func(p pointer, f *coderFieldInfo) error {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return proto.CheckInitialized(m)
+			},
+			merge: mergeMessage,
+		}
+	}
+}
+
+func sizeMessageInfo(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+	return protowire.SizeBytes(f.mi.sizePointer(p.Elem(), opts)) + f.tagsize
+}
+
+func appendMessageInfo(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(f.mi.sizePointer(p.Elem(), opts)))
+	return f.mi.marshalAppendPointer(b, p.Elem(), opts)
+}
+
+func consumeMessageInfo(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if p.Elem().IsNil() {
+		p.SetPointer(pointerOfValue(reflect.New(f.mi.GoReflectType.Elem())))
+	}
+	o, err := f.mi.unmarshalPointer(v, p.Elem(), 0, opts)
+	if err != nil {
+		return out, err
+	}
+	out.n = n
+	out.initialized = o.initialized
+	return out, nil
+}
+
+func isInitMessageInfo(p pointer, f *coderFieldInfo) error {
+	return f.mi.checkInitializedPointer(p.Elem())
+}
+
+func sizeMessage(m proto.Message, tagsize int, _ marshalOptions) int {
+	return protowire.SizeBytes(proto.Size(m)) + tagsize
+}
+
+func appendMessage(b []byte, m proto.Message, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, uint64(proto.Size(m)))
+	return opts.Options().MarshalAppend(b, m)
+}
+
+func consumeMessage(b []byte, m proto.Message, wtyp protowire.Type, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     v,
+		Message: m.ProtoReflect(),
+	})
+	if err != nil {
+		return out, err
+	}
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return out, nil
+}
+
+func sizeMessageValue(v pref.Value, tagsize int, opts marshalOptions) int {
+	m := v.Message().Interface()
+	return sizeMessage(m, tagsize, opts)
+}
+
+func appendMessageValue(b []byte, v pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	m := v.Message().Interface()
+	return appendMessage(b, m, wiretag, opts)
+}
+
+func consumeMessageValue(b []byte, v pref.Value, _ protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (pref.Value, unmarshalOutput, error) {
+	m := v.Message().Interface()
+	out, err := consumeMessage(b, m, wtyp, opts)
+	return v, out, err
+}
+
+func isInitMessageValue(v pref.Value) error {
+	m := v.Message().Interface()
+	return proto.CheckInitialized(m)
+}
+
+var coderMessageValue = valueCoderFuncs{
+	size:      sizeMessageValue,
+	marshal:   appendMessageValue,
+	unmarshal: consumeMessageValue,
+	isInit:    isInitMessageValue,
+	merge:     mergeMessageValue,
+}
+
+func sizeGroupValue(v pref.Value, tagsize int, opts marshalOptions) int {
+	m := v.Message().Interface()
+	return sizeGroup(m, tagsize, opts)
+}
+
+func appendGroupValue(b []byte, v pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	m := v.Message().Interface()
+	return appendGroup(b, m, wiretag, opts)
+}
+
+func consumeGroupValue(b []byte, v pref.Value, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (pref.Value, unmarshalOutput, error) {
+	m := v.Message().Interface()
+	out, err := consumeGroup(b, m, num, wtyp, opts)
+	return v, out, err
+}
+
+var coderGroupValue = valueCoderFuncs{
+	size:      sizeGroupValue,
+	marshal:   appendGroupValue,
+	unmarshal: consumeGroupValue,
+	isInit:    isInitMessageValue,
+	merge:     mergeMessageValue,
+}
+
+func makeGroupFieldCoder(fd pref.FieldDescriptor, ft reflect.Type) pointerCoderFuncs {
+	num := fd.Number()
+	if mi := getMessageInfo(ft); mi != nil {
+		funcs := pointerCoderFuncs{
+			size:      sizeGroupType,
+			marshal:   appendGroupType,
+			unmarshal: consumeGroupType,
+			merge:     mergeMessage,
+		}
+		if needsInitCheck(mi.Desc) {
+			funcs.isInit = isInitMessageInfo
+		}
+		return funcs
+	} else {
+		return pointerCoderFuncs{
+			size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return sizeGroup(m, f.tagsize, opts)
+			},
+			marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return appendGroup(b, m, f.wiretag, opts)
+			},
+			unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+				mp := p.AsValueOf(ft).Elem()
+				if mp.IsNil() {
+					mp.Set(reflect.New(ft.Elem()))
+				}
+				return consumeGroup(b, asMessage(mp), num, wtyp, opts)
+			},
+			isInit: func(p pointer, f *coderFieldInfo) error {
+				m := asMessage(p.AsValueOf(ft).Elem())
+				return proto.CheckInitialized(m)
+			},
+			merge: mergeMessage,
+		}
+	}
+}
+
+func sizeGroupType(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+	return 2*f.tagsize + f.mi.sizePointer(p.Elem(), opts)
+}
+
+func appendGroupType(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, f.wiretag) // start group
+	b, err := f.mi.marshalAppendPointer(b, p.Elem(), opts)
+	b = protowire.AppendVarint(b, f.wiretag+1) // end group
+	return b, err
+}
+
+func consumeGroupType(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.StartGroupType {
+		return out, errUnknown
+	}
+	if p.Elem().IsNil() {
+		p.SetPointer(pointerOfValue(reflect.New(f.mi.GoReflectType.Elem())))
+	}
+	return f.mi.unmarshalPointer(b, p.Elem(), f.num, opts)
+}
+
+func sizeGroup(m proto.Message, tagsize int, _ marshalOptions) int {
+	return 2*tagsize + proto.Size(m)
+}
+
+func appendGroup(b []byte, m proto.Message, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag) // start group
+	b, err := opts.Options().MarshalAppend(b, m)
+	b = protowire.AppendVarint(b, wiretag+1) // end group
+	return b, err
+}
+
+func consumeGroup(b []byte, m proto.Message, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.StartGroupType {
+		return out, errUnknown
+	}
+	b, n := protowire.ConsumeGroup(num, b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     b,
+		Message: m.ProtoReflect(),
+	})
+	if err != nil {
+		return out, err
+	}
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return out, nil
+}
+
+func makeMessageSliceFieldCoder(fd pref.FieldDescriptor, ft reflect.Type) pointerCoderFuncs {
+	if mi := getMessageInfo(ft); mi != nil {
+		funcs := pointerCoderFuncs{
+			size:      sizeMessageSliceInfo,
+			marshal:   appendMessageSliceInfo,
+			unmarshal: consumeMessageSliceInfo,
+			merge:     mergeMessageSlice,
+		}
+		if needsInitCheck(mi.Desc) {
+			funcs.isInit = isInitMessageSliceInfo
+		}
+		return funcs
+	}
+	return pointerCoderFuncs{
+		size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+			return sizeMessageSlice(p, ft, f.tagsize, opts)
+		},
+		marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+			return appendMessageSlice(b, p, f.wiretag, ft, opts)
+		},
+		unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+			return consumeMessageSlice(b, p, ft, wtyp, opts)
+		},
+		isInit: func(p pointer, f *coderFieldInfo) error {
+			return isInitMessageSlice(p, ft)
+		},
+		merge: mergeMessageSlice,
+	}
+}
+
+func sizeMessageSliceInfo(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+	s := p.PointerSlice()
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeBytes(f.mi.sizePointer(v, opts)) + f.tagsize
+	}
+	return n
+}
+
+func appendMessageSliceInfo(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	s := p.PointerSlice()
+	var err error
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		siz := f.mi.sizePointer(v, opts)
+		b = protowire.AppendVarint(b, uint64(siz))
+		b, err = f.mi.marshalAppendPointer(b, v, opts)
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func consumeMessageSliceInfo(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	m := reflect.New(f.mi.GoReflectType.Elem()).Interface()
+	mp := pointerOfIface(m)
+	o, err := f.mi.unmarshalPointer(v, mp, 0, opts)
+	if err != nil {
+		return out, err
+	}
+	p.AppendPointerSlice(mp)
+	out.n = n
+	out.initialized = o.initialized
+	return out, nil
+}
+
+func isInitMessageSliceInfo(p pointer, f *coderFieldInfo) error {
+	s := p.PointerSlice()
+	for _, v := range s {
+		if err := f.mi.checkInitializedPointer(v); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func sizeMessageSlice(p pointer, goType reflect.Type, tagsize int, _ marshalOptions) int {
+	s := p.PointerSlice()
+	n := 0
+	for _, v := range s {
+		m := asMessage(v.AsValueOf(goType.Elem()))
+		n += protowire.SizeBytes(proto.Size(m)) + tagsize
+	}
+	return n
+}
+
+func appendMessageSlice(b []byte, p pointer, wiretag uint64, goType reflect.Type, opts marshalOptions) ([]byte, error) {
+	s := p.PointerSlice()
+	var err error
+	for _, v := range s {
+		m := asMessage(v.AsValueOf(goType.Elem()))
+		b = protowire.AppendVarint(b, wiretag)
+		siz := proto.Size(m)
+		b = protowire.AppendVarint(b, uint64(siz))
+		b, err = opts.Options().MarshalAppend(b, m)
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func consumeMessageSlice(b []byte, p pointer, goType reflect.Type, wtyp protowire.Type, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	mp := reflect.New(goType.Elem())
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     v,
+		Message: asMessage(mp).ProtoReflect(),
+	})
+	if err != nil {
+		return out, err
+	}
+	p.AppendPointerSlice(pointerOfValue(mp))
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return out, nil
+}
+
+func isInitMessageSlice(p pointer, goType reflect.Type) error {
+	s := p.PointerSlice()
+	for _, v := range s {
+		m := asMessage(v.AsValueOf(goType.Elem()))
+		if err := proto.CheckInitialized(m); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Slices of messages
+
+func sizeMessageSliceValue(listv pref.Value, tagsize int, opts marshalOptions) int {
+	list := listv.List()
+	n := 0
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		m := list.Get(i).Message().Interface()
+		n += protowire.SizeBytes(proto.Size(m)) + tagsize
+	}
+	return n
+}
+
+func appendMessageSliceValue(b []byte, listv pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	list := listv.List()
+	mopts := opts.Options()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		m := list.Get(i).Message().Interface()
+		b = protowire.AppendVarint(b, wiretag)
+		siz := proto.Size(m)
+		b = protowire.AppendVarint(b, uint64(siz))
+		var err error
+		b, err = mopts.MarshalAppend(b, m)
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func consumeMessageSliceValue(b []byte, listv pref.Value, _ protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (_ pref.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp != protowire.BytesType {
+		return pref.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return pref.Value{}, out, protowire.ParseError(n)
+	}
+	m := list.NewElement()
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     v,
+		Message: m.Message(),
+	})
+	if err != nil {
+		return pref.Value{}, out, err
+	}
+	list.Append(m)
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return listv, out, nil
+}
+
+func isInitMessageSliceValue(listv pref.Value) error {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		m := list.Get(i).Message().Interface()
+		if err := proto.CheckInitialized(m); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+var coderMessageSliceValue = valueCoderFuncs{
+	size:      sizeMessageSliceValue,
+	marshal:   appendMessageSliceValue,
+	unmarshal: consumeMessageSliceValue,
+	isInit:    isInitMessageSliceValue,
+	merge:     mergeMessageListValue,
+}
+
+func sizeGroupSliceValue(listv pref.Value, tagsize int, opts marshalOptions) int {
+	list := listv.List()
+	n := 0
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		m := list.Get(i).Message().Interface()
+		n += 2*tagsize + proto.Size(m)
+	}
+	return n
+}
+
+func appendGroupSliceValue(b []byte, listv pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error) {
+	list := listv.List()
+	mopts := opts.Options()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		m := list.Get(i).Message().Interface()
+		b = protowire.AppendVarint(b, wiretag) // start group
+		var err error
+		b, err = mopts.MarshalAppend(b, m)
+		if err != nil {
+			return b, err
+		}
+		b = protowire.AppendVarint(b, wiretag+1) // end group
+	}
+	return b, nil
+}
+
+func consumeGroupSliceValue(b []byte, listv pref.Value, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (_ pref.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp != protowire.StartGroupType {
+		return pref.Value{}, out, errUnknown
+	}
+	b, n := protowire.ConsumeGroup(num, b)
+	if n < 0 {
+		return pref.Value{}, out, protowire.ParseError(n)
+	}
+	m := list.NewElement()
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     b,
+		Message: m.Message(),
+	})
+	if err != nil {
+		return pref.Value{}, out, err
+	}
+	list.Append(m)
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return listv, out, nil
+}
+
+var coderGroupSliceValue = valueCoderFuncs{
+	size:      sizeGroupSliceValue,
+	marshal:   appendGroupSliceValue,
+	unmarshal: consumeGroupSliceValue,
+	isInit:    isInitMessageSliceValue,
+	merge:     mergeMessageListValue,
+}
+
+func makeGroupSliceFieldCoder(fd pref.FieldDescriptor, ft reflect.Type) pointerCoderFuncs {
+	num := fd.Number()
+	if mi := getMessageInfo(ft); mi != nil {
+		funcs := pointerCoderFuncs{
+			size:      sizeGroupSliceInfo,
+			marshal:   appendGroupSliceInfo,
+			unmarshal: consumeGroupSliceInfo,
+			merge:     mergeMessageSlice,
+		}
+		if needsInitCheck(mi.Desc) {
+			funcs.isInit = isInitMessageSliceInfo
+		}
+		return funcs
+	}
+	return pointerCoderFuncs{
+		size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+			return sizeGroupSlice(p, ft, f.tagsize, opts)
+		},
+		marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+			return appendGroupSlice(b, p, f.wiretag, ft, opts)
+		},
+		unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+			return consumeGroupSlice(b, p, num, wtyp, ft, opts)
+		},
+		isInit: func(p pointer, f *coderFieldInfo) error {
+			return isInitMessageSlice(p, ft)
+		},
+		merge: mergeMessageSlice,
+	}
+}
+
+func sizeGroupSlice(p pointer, messageType reflect.Type, tagsize int, _ marshalOptions) int {
+	s := p.PointerSlice()
+	n := 0
+	for _, v := range s {
+		m := asMessage(v.AsValueOf(messageType.Elem()))
+		n += 2*tagsize + proto.Size(m)
+	}
+	return n
+}
+
+func appendGroupSlice(b []byte, p pointer, wiretag uint64, messageType reflect.Type, opts marshalOptions) ([]byte, error) {
+	s := p.PointerSlice()
+	var err error
+	for _, v := range s {
+		m := asMessage(v.AsValueOf(messageType.Elem()))
+		b = protowire.AppendVarint(b, wiretag) // start group
+		b, err = opts.Options().MarshalAppend(b, m)
+		if err != nil {
+			return b, err
+		}
+		b = protowire.AppendVarint(b, wiretag+1) // end group
+	}
+	return b, nil
+}
+
+func consumeGroupSlice(b []byte, p pointer, num protowire.Number, wtyp protowire.Type, goType reflect.Type, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.StartGroupType {
+		return out, errUnknown
+	}
+	b, n := protowire.ConsumeGroup(num, b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	mp := reflect.New(goType.Elem())
+	o, err := opts.Options().UnmarshalState(piface.UnmarshalInput{
+		Buf:     b,
+		Message: asMessage(mp).ProtoReflect(),
+	})
+	if err != nil {
+		return out, err
+	}
+	p.AppendPointerSlice(pointerOfValue(mp))
+	out.n = n
+	out.initialized = o.Flags&piface.UnmarshalInitialized != 0
+	return out, nil
+}
+
+func sizeGroupSliceInfo(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+	s := p.PointerSlice()
+	n := 0
+	for _, v := range s {
+		n += 2*f.tagsize + f.mi.sizePointer(v, opts)
+	}
+	return n
+}
+
+func appendGroupSliceInfo(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	s := p.PointerSlice()
+	var err error
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag) // start group
+		b, err = f.mi.marshalAppendPointer(b, v, opts)
+		if err != nil {
+			return b, err
+		}
+		b = protowire.AppendVarint(b, f.wiretag+1) // end group
+	}
+	return b, nil
+}
+
+func consumeGroupSliceInfo(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+	if wtyp != protowire.StartGroupType {
+		return unmarshalOutput{}, errUnknown
+	}
+	m := reflect.New(f.mi.GoReflectType.Elem()).Interface()
+	mp := pointerOfIface(m)
+	out, err := f.mi.unmarshalPointer(b, mp, f.num, opts)
+	if err != nil {
+		return out, err
+	}
+	p.AppendPointerSlice(mp)
+	return out, nil
+}
+
+func asMessage(v reflect.Value) pref.ProtoMessage {
+	if m, ok := v.Interface().(pref.ProtoMessage); ok {
+		return m
+	}
+	return legacyWrapMessage(v).Interface()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_gen.go b/vendor/google.golang.org/protobuf/internal/impl/codec_gen.go
new file mode 100644
index 0000000..ff198d0
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_gen.go
@@ -0,0 +1,5637 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package impl
+
+import (
+	"math"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// sizeBool returns the size of wire encoding a bool pointer as a Bool.
+func sizeBool(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Bool()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeBool(v))
+}
+
+// appendBool wire encodes a bool pointer as a Bool.
+func appendBool(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bool()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeBool(v))
+	return b, nil
+}
+
+// consumeBool wire decodes a bool pointer as a Bool.
+func consumeBool(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Bool() = protowire.DecodeBool(v)
+	out.n = n
+	return out, nil
+}
+
+var coderBool = pointerCoderFuncs{
+	size:      sizeBool,
+	marshal:   appendBool,
+	unmarshal: consumeBool,
+	merge:     mergeBool,
+}
+
+// sizeBoolNoZero returns the size of wire encoding a bool pointer as a Bool.
+// The zero value is not encoded.
+func sizeBoolNoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Bool()
+	if v == false {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeBool(v))
+}
+
+// appendBoolNoZero wire encodes a bool pointer as a Bool.
+// The zero value is not encoded.
+func appendBoolNoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bool()
+	if v == false {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeBool(v))
+	return b, nil
+}
+
+var coderBoolNoZero = pointerCoderFuncs{
+	size:      sizeBoolNoZero,
+	marshal:   appendBoolNoZero,
+	unmarshal: consumeBool,
+	merge:     mergeBoolNoZero,
+}
+
+// sizeBoolPtr returns the size of wire encoding a *bool pointer as a Bool.
+// It panics if the pointer is nil.
+func sizeBoolPtr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.BoolPtr()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeBool(v))
+}
+
+// appendBoolPtr wire encodes a *bool pointer as a Bool.
+// It panics if the pointer is nil.
+func appendBoolPtr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.BoolPtr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeBool(v))
+	return b, nil
+}
+
+// consumeBoolPtr wire decodes a *bool pointer as a Bool.
+func consumeBoolPtr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.BoolPtr()
+	if *vp == nil {
+		*vp = new(bool)
+	}
+	**vp = protowire.DecodeBool(v)
+	out.n = n
+	return out, nil
+}
+
+var coderBoolPtr = pointerCoderFuncs{
+	size:      sizeBoolPtr,
+	marshal:   appendBoolPtr,
+	unmarshal: consumeBoolPtr,
+	merge:     mergeBoolPtr,
+}
+
+// sizeBoolSlice returns the size of wire encoding a []bool pointer as a repeated Bool.
+func sizeBoolSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.BoolSlice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(protowire.EncodeBool(v))
+	}
+	return size
+}
+
+// appendBoolSlice encodes a []bool pointer as a repeated Bool.
+func appendBoolSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.BoolSlice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeBool(v))
+	}
+	return b, nil
+}
+
+// consumeBoolSlice wire decodes a []bool pointer as a repeated Bool.
+func consumeBoolSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.BoolSlice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, protowire.DecodeBool(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, protowire.DecodeBool(v))
+	out.n = n
+	return out, nil
+}
+
+var coderBoolSlice = pointerCoderFuncs{
+	size:      sizeBoolSlice,
+	marshal:   appendBoolSlice,
+	unmarshal: consumeBoolSlice,
+	merge:     mergeBoolSlice,
+}
+
+// sizeBoolPackedSlice returns the size of wire encoding a []bool pointer as a packed repeated Bool.
+func sizeBoolPackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.BoolSlice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeBool(v))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendBoolPackedSlice encodes a []bool pointer as a packed repeated Bool.
+func appendBoolPackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.BoolSlice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeBool(v))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, protowire.EncodeBool(v))
+	}
+	return b, nil
+}
+
+var coderBoolPackedSlice = pointerCoderFuncs{
+	size:      sizeBoolPackedSlice,
+	marshal:   appendBoolPackedSlice,
+	unmarshal: consumeBoolSlice,
+	merge:     mergeBoolSlice,
+}
+
+// sizeBoolValue returns the size of wire encoding a bool value as a Bool.
+func sizeBoolValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(protowire.EncodeBool(v.Bool()))
+}
+
+// appendBoolValue encodes a bool value as a Bool.
+func appendBoolValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeBool(v.Bool()))
+	return b, nil
+}
+
+// consumeBoolValue decodes a bool value as a Bool.
+func consumeBoolValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfBool(protowire.DecodeBool(v)), out, nil
+}
+
+var coderBoolValue = valueCoderFuncs{
+	size:      sizeBoolValue,
+	marshal:   appendBoolValue,
+	unmarshal: consumeBoolValue,
+	merge:     mergeScalarValue,
+}
+
+// sizeBoolSliceValue returns the size of wire encoding a []bool value as a repeated Bool.
+func sizeBoolSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(protowire.EncodeBool(v.Bool()))
+	}
+	return size
+}
+
+// appendBoolSliceValue encodes a []bool value as a repeated Bool.
+func appendBoolSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeBool(v.Bool()))
+	}
+	return b, nil
+}
+
+// consumeBoolSliceValue wire decodes a []bool value as a repeated Bool.
+func consumeBoolSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfBool(protowire.DecodeBool(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfBool(protowire.DecodeBool(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderBoolSliceValue = valueCoderFuncs{
+	size:      sizeBoolSliceValue,
+	marshal:   appendBoolSliceValue,
+	unmarshal: consumeBoolSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeBoolPackedSliceValue returns the size of wire encoding a []bool value as a packed repeated Bool.
+func sizeBoolPackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeBool(v.Bool()))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendBoolPackedSliceValue encodes a []bool value as a packed repeated Bool.
+func appendBoolPackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeBool(v.Bool()))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, protowire.EncodeBool(v.Bool()))
+	}
+	return b, nil
+}
+
+var coderBoolPackedSliceValue = valueCoderFuncs{
+	size:      sizeBoolPackedSliceValue,
+	marshal:   appendBoolPackedSliceValue,
+	unmarshal: consumeBoolSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeEnumValue returns the size of wire encoding a  value as a Enum.
+func sizeEnumValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(uint64(v.Enum()))
+}
+
+// appendEnumValue encodes a  value as a Enum.
+func appendEnumValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, uint64(v.Enum()))
+	return b, nil
+}
+
+// consumeEnumValue decodes a  value as a Enum.
+func consumeEnumValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)), out, nil
+}
+
+var coderEnumValue = valueCoderFuncs{
+	size:      sizeEnumValue,
+	marshal:   appendEnumValue,
+	unmarshal: consumeEnumValue,
+	merge:     mergeScalarValue,
+}
+
+// sizeEnumSliceValue returns the size of wire encoding a [] value as a repeated Enum.
+func sizeEnumSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(uint64(v.Enum()))
+	}
+	return size
+}
+
+// appendEnumSliceValue encodes a [] value as a repeated Enum.
+func appendEnumSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, uint64(v.Enum()))
+	}
+	return b, nil
+}
+
+// consumeEnumSliceValue wire decodes a [] value as a repeated Enum.
+func consumeEnumSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderEnumSliceValue = valueCoderFuncs{
+	size:      sizeEnumSliceValue,
+	marshal:   appendEnumSliceValue,
+	unmarshal: consumeEnumSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeEnumPackedSliceValue returns the size of wire encoding a [] value as a packed repeated Enum.
+func sizeEnumPackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(v.Enum()))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendEnumPackedSliceValue encodes a [] value as a packed repeated Enum.
+func appendEnumPackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(v.Enum()))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, uint64(v.Enum()))
+	}
+	return b, nil
+}
+
+var coderEnumPackedSliceValue = valueCoderFuncs{
+	size:      sizeEnumPackedSliceValue,
+	marshal:   appendEnumPackedSliceValue,
+	unmarshal: consumeEnumSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeInt32 returns the size of wire encoding a int32 pointer as a Int32.
+func sizeInt32(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int32()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt32 wire encodes a int32 pointer as a Int32.
+func appendInt32(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeInt32 wire decodes a int32 pointer as a Int32.
+func consumeInt32(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int32() = int32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderInt32 = pointerCoderFuncs{
+	size:      sizeInt32,
+	marshal:   appendInt32,
+	unmarshal: consumeInt32,
+	merge:     mergeInt32,
+}
+
+// sizeInt32NoZero returns the size of wire encoding a int32 pointer as a Int32.
+// The zero value is not encoded.
+func sizeInt32NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int32()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt32NoZero wire encodes a int32 pointer as a Int32.
+// The zero value is not encoded.
+func appendInt32NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+var coderInt32NoZero = pointerCoderFuncs{
+	size:      sizeInt32NoZero,
+	marshal:   appendInt32NoZero,
+	unmarshal: consumeInt32,
+	merge:     mergeInt32NoZero,
+}
+
+// sizeInt32Ptr returns the size of wire encoding a *int32 pointer as a Int32.
+// It panics if the pointer is nil.
+func sizeInt32Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Int32Ptr()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt32Ptr wire encodes a *int32 pointer as a Int32.
+// It panics if the pointer is nil.
+func appendInt32Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeInt32Ptr wire decodes a *int32 pointer as a Int32.
+func consumeInt32Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int32Ptr()
+	if *vp == nil {
+		*vp = new(int32)
+	}
+	**vp = int32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderInt32Ptr = pointerCoderFuncs{
+	size:      sizeInt32Ptr,
+	marshal:   appendInt32Ptr,
+	unmarshal: consumeInt32Ptr,
+	merge:     mergeInt32Ptr,
+}
+
+// sizeInt32Slice returns the size of wire encoding a []int32 pointer as a repeated Int32.
+func sizeInt32Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(uint64(v))
+	}
+	return size
+}
+
+// appendInt32Slice encodes a []int32 pointer as a repeated Int32.
+func appendInt32Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+// consumeInt32Slice wire decodes a []int32 pointer as a repeated Int32.
+func consumeInt32Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, int32(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, int32(v))
+	out.n = n
+	return out, nil
+}
+
+var coderInt32Slice = pointerCoderFuncs{
+	size:      sizeInt32Slice,
+	marshal:   appendInt32Slice,
+	unmarshal: consumeInt32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeInt32PackedSlice returns the size of wire encoding a []int32 pointer as a packed repeated Int32.
+func sizeInt32PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendInt32PackedSlice encodes a []int32 pointer as a packed repeated Int32.
+func appendInt32PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+var coderInt32PackedSlice = pointerCoderFuncs{
+	size:      sizeInt32PackedSlice,
+	marshal:   appendInt32PackedSlice,
+	unmarshal: consumeInt32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeInt32Value returns the size of wire encoding a int32 value as a Int32.
+func sizeInt32Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(uint64(int32(v.Int())))
+}
+
+// appendInt32Value encodes a int32 value as a Int32.
+func appendInt32Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, uint64(int32(v.Int())))
+	return b, nil
+}
+
+// consumeInt32Value decodes a int32 value as a Int32.
+func consumeInt32Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt32(int32(v)), out, nil
+}
+
+var coderInt32Value = valueCoderFuncs{
+	size:      sizeInt32Value,
+	marshal:   appendInt32Value,
+	unmarshal: consumeInt32Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeInt32SliceValue returns the size of wire encoding a []int32 value as a repeated Int32.
+func sizeInt32SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(uint64(int32(v.Int())))
+	}
+	return size
+}
+
+// appendInt32SliceValue encodes a []int32 value as a repeated Int32.
+func appendInt32SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, uint64(int32(v.Int())))
+	}
+	return b, nil
+}
+
+// consumeInt32SliceValue wire decodes a []int32 value as a repeated Int32.
+func consumeInt32SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt32(int32(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt32(int32(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderInt32SliceValue = valueCoderFuncs{
+	size:      sizeInt32SliceValue,
+	marshal:   appendInt32SliceValue,
+	unmarshal: consumeInt32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeInt32PackedSliceValue returns the size of wire encoding a []int32 value as a packed repeated Int32.
+func sizeInt32PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(int32(v.Int())))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendInt32PackedSliceValue encodes a []int32 value as a packed repeated Int32.
+func appendInt32PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(int32(v.Int())))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, uint64(int32(v.Int())))
+	}
+	return b, nil
+}
+
+var coderInt32PackedSliceValue = valueCoderFuncs{
+	size:      sizeInt32PackedSliceValue,
+	marshal:   appendInt32PackedSliceValue,
+	unmarshal: consumeInt32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSint32 returns the size of wire encoding a int32 pointer as a Sint32.
+func sizeSint32(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int32()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+}
+
+// appendSint32 wire encodes a int32 pointer as a Sint32.
+func appendSint32(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(v)))
+	return b, nil
+}
+
+// consumeSint32 wire decodes a int32 pointer as a Sint32.
+func consumeSint32(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int32() = int32(protowire.DecodeZigZag(v & math.MaxUint32))
+	out.n = n
+	return out, nil
+}
+
+var coderSint32 = pointerCoderFuncs{
+	size:      sizeSint32,
+	marshal:   appendSint32,
+	unmarshal: consumeSint32,
+	merge:     mergeInt32,
+}
+
+// sizeSint32NoZero returns the size of wire encoding a int32 pointer as a Sint32.
+// The zero value is not encoded.
+func sizeSint32NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int32()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+}
+
+// appendSint32NoZero wire encodes a int32 pointer as a Sint32.
+// The zero value is not encoded.
+func appendSint32NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(v)))
+	return b, nil
+}
+
+var coderSint32NoZero = pointerCoderFuncs{
+	size:      sizeSint32NoZero,
+	marshal:   appendSint32NoZero,
+	unmarshal: consumeSint32,
+	merge:     mergeInt32NoZero,
+}
+
+// sizeSint32Ptr returns the size of wire encoding a *int32 pointer as a Sint32.
+// It panics if the pointer is nil.
+func sizeSint32Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Int32Ptr()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+}
+
+// appendSint32Ptr wire encodes a *int32 pointer as a Sint32.
+// It panics if the pointer is nil.
+func appendSint32Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(v)))
+	return b, nil
+}
+
+// consumeSint32Ptr wire decodes a *int32 pointer as a Sint32.
+func consumeSint32Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int32Ptr()
+	if *vp == nil {
+		*vp = new(int32)
+	}
+	**vp = int32(protowire.DecodeZigZag(v & math.MaxUint32))
+	out.n = n
+	return out, nil
+}
+
+var coderSint32Ptr = pointerCoderFuncs{
+	size:      sizeSint32Ptr,
+	marshal:   appendSint32Ptr,
+	unmarshal: consumeSint32Ptr,
+	merge:     mergeInt32Ptr,
+}
+
+// sizeSint32Slice returns the size of wire encoding a []int32 pointer as a repeated Sint32.
+func sizeSint32Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+	}
+	return size
+}
+
+// appendSint32Slice encodes a []int32 pointer as a repeated Sint32.
+func appendSint32Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(v)))
+	}
+	return b, nil
+}
+
+// consumeSint32Slice wire decodes a []int32 pointer as a repeated Sint32.
+func consumeSint32Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, int32(protowire.DecodeZigZag(v&math.MaxUint32)))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, int32(protowire.DecodeZigZag(v&math.MaxUint32)))
+	out.n = n
+	return out, nil
+}
+
+var coderSint32Slice = pointerCoderFuncs{
+	size:      sizeSint32Slice,
+	marshal:   appendSint32Slice,
+	unmarshal: consumeSint32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeSint32PackedSlice returns the size of wire encoding a []int32 pointer as a packed repeated Sint32.
+func sizeSint32PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendSint32PackedSlice encodes a []int32 pointer as a packed repeated Sint32.
+func appendSint32PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeZigZag(int64(v)))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(v)))
+	}
+	return b, nil
+}
+
+var coderSint32PackedSlice = pointerCoderFuncs{
+	size:      sizeSint32PackedSlice,
+	marshal:   appendSint32PackedSlice,
+	unmarshal: consumeSint32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeSint32Value returns the size of wire encoding a int32 value as a Sint32.
+func sizeSint32Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(int32(v.Int()))))
+}
+
+// appendSint32Value encodes a int32 value as a Sint32.
+func appendSint32Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(int32(v.Int()))))
+	return b, nil
+}
+
+// consumeSint32Value decodes a int32 value as a Sint32.
+func consumeSint32Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))), out, nil
+}
+
+var coderSint32Value = valueCoderFuncs{
+	size:      sizeSint32Value,
+	marshal:   appendSint32Value,
+	unmarshal: consumeSint32Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeSint32SliceValue returns the size of wire encoding a []int32 value as a repeated Sint32.
+func sizeSint32SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(protowire.EncodeZigZag(int64(int32(v.Int()))))
+	}
+	return size
+}
+
+// appendSint32SliceValue encodes a []int32 value as a repeated Sint32.
+func appendSint32SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(int32(v.Int()))))
+	}
+	return b, nil
+}
+
+// consumeSint32SliceValue wire decodes a []int32 value as a repeated Sint32.
+func consumeSint32SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderSint32SliceValue = valueCoderFuncs{
+	size:      sizeSint32SliceValue,
+	marshal:   appendSint32SliceValue,
+	unmarshal: consumeSint32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSint32PackedSliceValue returns the size of wire encoding a []int32 value as a packed repeated Sint32.
+func sizeSint32PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeZigZag(int64(int32(v.Int()))))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendSint32PackedSliceValue encodes a []int32 value as a packed repeated Sint32.
+func appendSint32PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeZigZag(int64(int32(v.Int()))))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(int32(v.Int()))))
+	}
+	return b, nil
+}
+
+var coderSint32PackedSliceValue = valueCoderFuncs{
+	size:      sizeSint32PackedSliceValue,
+	marshal:   appendSint32PackedSliceValue,
+	unmarshal: consumeSint32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeUint32 returns the size of wire encoding a uint32 pointer as a Uint32.
+func sizeUint32(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint32()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendUint32 wire encodes a uint32 pointer as a Uint32.
+func appendUint32(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeUint32 wire decodes a uint32 pointer as a Uint32.
+func consumeUint32(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Uint32() = uint32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderUint32 = pointerCoderFuncs{
+	size:      sizeUint32,
+	marshal:   appendUint32,
+	unmarshal: consumeUint32,
+	merge:     mergeUint32,
+}
+
+// sizeUint32NoZero returns the size of wire encoding a uint32 pointer as a Uint32.
+// The zero value is not encoded.
+func sizeUint32NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint32()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendUint32NoZero wire encodes a uint32 pointer as a Uint32.
+// The zero value is not encoded.
+func appendUint32NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint32()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+var coderUint32NoZero = pointerCoderFuncs{
+	size:      sizeUint32NoZero,
+	marshal:   appendUint32NoZero,
+	unmarshal: consumeUint32,
+	merge:     mergeUint32NoZero,
+}
+
+// sizeUint32Ptr returns the size of wire encoding a *uint32 pointer as a Uint32.
+// It panics if the pointer is nil.
+func sizeUint32Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Uint32Ptr()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendUint32Ptr wire encodes a *uint32 pointer as a Uint32.
+// It panics if the pointer is nil.
+func appendUint32Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Uint32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeUint32Ptr wire decodes a *uint32 pointer as a Uint32.
+func consumeUint32Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Uint32Ptr()
+	if *vp == nil {
+		*vp = new(uint32)
+	}
+	**vp = uint32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderUint32Ptr = pointerCoderFuncs{
+	size:      sizeUint32Ptr,
+	marshal:   appendUint32Ptr,
+	unmarshal: consumeUint32Ptr,
+	merge:     mergeUint32Ptr,
+}
+
+// sizeUint32Slice returns the size of wire encoding a []uint32 pointer as a repeated Uint32.
+func sizeUint32Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint32Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(uint64(v))
+	}
+	return size
+}
+
+// appendUint32Slice encodes a []uint32 pointer as a repeated Uint32.
+func appendUint32Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+// consumeUint32Slice wire decodes a []uint32 pointer as a repeated Uint32.
+func consumeUint32Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Uint32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, uint32(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, uint32(v))
+	out.n = n
+	return out, nil
+}
+
+var coderUint32Slice = pointerCoderFuncs{
+	size:      sizeUint32Slice,
+	marshal:   appendUint32Slice,
+	unmarshal: consumeUint32Slice,
+	merge:     mergeUint32Slice,
+}
+
+// sizeUint32PackedSlice returns the size of wire encoding a []uint32 pointer as a packed repeated Uint32.
+func sizeUint32PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendUint32PackedSlice encodes a []uint32 pointer as a packed repeated Uint32.
+func appendUint32PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+var coderUint32PackedSlice = pointerCoderFuncs{
+	size:      sizeUint32PackedSlice,
+	marshal:   appendUint32PackedSlice,
+	unmarshal: consumeUint32Slice,
+	merge:     mergeUint32Slice,
+}
+
+// sizeUint32Value returns the size of wire encoding a uint32 value as a Uint32.
+func sizeUint32Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(uint64(uint32(v.Uint())))
+}
+
+// appendUint32Value encodes a uint32 value as a Uint32.
+func appendUint32Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, uint64(uint32(v.Uint())))
+	return b, nil
+}
+
+// consumeUint32Value decodes a uint32 value as a Uint32.
+func consumeUint32Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfUint32(uint32(v)), out, nil
+}
+
+var coderUint32Value = valueCoderFuncs{
+	size:      sizeUint32Value,
+	marshal:   appendUint32Value,
+	unmarshal: consumeUint32Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeUint32SliceValue returns the size of wire encoding a []uint32 value as a repeated Uint32.
+func sizeUint32SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(uint64(uint32(v.Uint())))
+	}
+	return size
+}
+
+// appendUint32SliceValue encodes a []uint32 value as a repeated Uint32.
+func appendUint32SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, uint64(uint32(v.Uint())))
+	}
+	return b, nil
+}
+
+// consumeUint32SliceValue wire decodes a []uint32 value as a repeated Uint32.
+func consumeUint32SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfUint32(uint32(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfUint32(uint32(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderUint32SliceValue = valueCoderFuncs{
+	size:      sizeUint32SliceValue,
+	marshal:   appendUint32SliceValue,
+	unmarshal: consumeUint32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeUint32PackedSliceValue returns the size of wire encoding a []uint32 value as a packed repeated Uint32.
+func sizeUint32PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(uint32(v.Uint())))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendUint32PackedSliceValue encodes a []uint32 value as a packed repeated Uint32.
+func appendUint32PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(uint32(v.Uint())))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, uint64(uint32(v.Uint())))
+	}
+	return b, nil
+}
+
+var coderUint32PackedSliceValue = valueCoderFuncs{
+	size:      sizeUint32PackedSliceValue,
+	marshal:   appendUint32PackedSliceValue,
+	unmarshal: consumeUint32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeInt64 returns the size of wire encoding a int64 pointer as a Int64.
+func sizeInt64(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int64()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt64 wire encodes a int64 pointer as a Int64.
+func appendInt64(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeInt64 wire decodes a int64 pointer as a Int64.
+func consumeInt64(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int64() = int64(v)
+	out.n = n
+	return out, nil
+}
+
+var coderInt64 = pointerCoderFuncs{
+	size:      sizeInt64,
+	marshal:   appendInt64,
+	unmarshal: consumeInt64,
+	merge:     mergeInt64,
+}
+
+// sizeInt64NoZero returns the size of wire encoding a int64 pointer as a Int64.
+// The zero value is not encoded.
+func sizeInt64NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int64()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt64NoZero wire encodes a int64 pointer as a Int64.
+// The zero value is not encoded.
+func appendInt64NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+var coderInt64NoZero = pointerCoderFuncs{
+	size:      sizeInt64NoZero,
+	marshal:   appendInt64NoZero,
+	unmarshal: consumeInt64,
+	merge:     mergeInt64NoZero,
+}
+
+// sizeInt64Ptr returns the size of wire encoding a *int64 pointer as a Int64.
+// It panics if the pointer is nil.
+func sizeInt64Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Int64Ptr()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+// appendInt64Ptr wire encodes a *int64 pointer as a Int64.
+// It panics if the pointer is nil.
+func appendInt64Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+// consumeInt64Ptr wire decodes a *int64 pointer as a Int64.
+func consumeInt64Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int64Ptr()
+	if *vp == nil {
+		*vp = new(int64)
+	}
+	**vp = int64(v)
+	out.n = n
+	return out, nil
+}
+
+var coderInt64Ptr = pointerCoderFuncs{
+	size:      sizeInt64Ptr,
+	marshal:   appendInt64Ptr,
+	unmarshal: consumeInt64Ptr,
+	merge:     mergeInt64Ptr,
+}
+
+// sizeInt64Slice returns the size of wire encoding a []int64 pointer as a repeated Int64.
+func sizeInt64Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(uint64(v))
+	}
+	return size
+}
+
+// appendInt64Slice encodes a []int64 pointer as a repeated Int64.
+func appendInt64Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+// consumeInt64Slice wire decodes a []int64 pointer as a repeated Int64.
+func consumeInt64Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, int64(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, int64(v))
+	out.n = n
+	return out, nil
+}
+
+var coderInt64Slice = pointerCoderFuncs{
+	size:      sizeInt64Slice,
+	marshal:   appendInt64Slice,
+	unmarshal: consumeInt64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeInt64PackedSlice returns the size of wire encoding a []int64 pointer as a packed repeated Int64.
+func sizeInt64PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendInt64PackedSlice encodes a []int64 pointer as a packed repeated Int64.
+func appendInt64PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(uint64(v))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, uint64(v))
+	}
+	return b, nil
+}
+
+var coderInt64PackedSlice = pointerCoderFuncs{
+	size:      sizeInt64PackedSlice,
+	marshal:   appendInt64PackedSlice,
+	unmarshal: consumeInt64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeInt64Value returns the size of wire encoding a int64 value as a Int64.
+func sizeInt64Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(uint64(v.Int()))
+}
+
+// appendInt64Value encodes a int64 value as a Int64.
+func appendInt64Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, uint64(v.Int()))
+	return b, nil
+}
+
+// consumeInt64Value decodes a int64 value as a Int64.
+func consumeInt64Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt64(int64(v)), out, nil
+}
+
+var coderInt64Value = valueCoderFuncs{
+	size:      sizeInt64Value,
+	marshal:   appendInt64Value,
+	unmarshal: consumeInt64Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeInt64SliceValue returns the size of wire encoding a []int64 value as a repeated Int64.
+func sizeInt64SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(uint64(v.Int()))
+	}
+	return size
+}
+
+// appendInt64SliceValue encodes a []int64 value as a repeated Int64.
+func appendInt64SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, uint64(v.Int()))
+	}
+	return b, nil
+}
+
+// consumeInt64SliceValue wire decodes a []int64 value as a repeated Int64.
+func consumeInt64SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt64(int64(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt64(int64(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderInt64SliceValue = valueCoderFuncs{
+	size:      sizeInt64SliceValue,
+	marshal:   appendInt64SliceValue,
+	unmarshal: consumeInt64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeInt64PackedSliceValue returns the size of wire encoding a []int64 value as a packed repeated Int64.
+func sizeInt64PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(v.Int()))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendInt64PackedSliceValue encodes a []int64 value as a packed repeated Int64.
+func appendInt64PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(uint64(v.Int()))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, uint64(v.Int()))
+	}
+	return b, nil
+}
+
+var coderInt64PackedSliceValue = valueCoderFuncs{
+	size:      sizeInt64PackedSliceValue,
+	marshal:   appendInt64PackedSliceValue,
+	unmarshal: consumeInt64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSint64 returns the size of wire encoding a int64 pointer as a Sint64.
+func sizeSint64(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int64()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v))
+}
+
+// appendSint64 wire encodes a int64 pointer as a Sint64.
+func appendSint64(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(v))
+	return b, nil
+}
+
+// consumeSint64 wire decodes a int64 pointer as a Sint64.
+func consumeSint64(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int64() = protowire.DecodeZigZag(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSint64 = pointerCoderFuncs{
+	size:      sizeSint64,
+	marshal:   appendSint64,
+	unmarshal: consumeSint64,
+	merge:     mergeInt64,
+}
+
+// sizeSint64NoZero returns the size of wire encoding a int64 pointer as a Sint64.
+// The zero value is not encoded.
+func sizeSint64NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int64()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v))
+}
+
+// appendSint64NoZero wire encodes a int64 pointer as a Sint64.
+// The zero value is not encoded.
+func appendSint64NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(v))
+	return b, nil
+}
+
+var coderSint64NoZero = pointerCoderFuncs{
+	size:      sizeSint64NoZero,
+	marshal:   appendSint64NoZero,
+	unmarshal: consumeSint64,
+	merge:     mergeInt64NoZero,
+}
+
+// sizeSint64Ptr returns the size of wire encoding a *int64 pointer as a Sint64.
+// It panics if the pointer is nil.
+func sizeSint64Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Int64Ptr()
+	return f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v))
+}
+
+// appendSint64Ptr wire encodes a *int64 pointer as a Sint64.
+// It panics if the pointer is nil.
+func appendSint64Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(v))
+	return b, nil
+}
+
+// consumeSint64Ptr wire decodes a *int64 pointer as a Sint64.
+func consumeSint64Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int64Ptr()
+	if *vp == nil {
+		*vp = new(int64)
+	}
+	**vp = protowire.DecodeZigZag(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSint64Ptr = pointerCoderFuncs{
+	size:      sizeSint64Ptr,
+	marshal:   appendSint64Ptr,
+	unmarshal: consumeSint64Ptr,
+	merge:     mergeInt64Ptr,
+}
+
+// sizeSint64Slice returns the size of wire encoding a []int64 pointer as a repeated Sint64.
+func sizeSint64Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v))
+	}
+	return size
+}
+
+// appendSint64Slice encodes a []int64 pointer as a repeated Sint64.
+func appendSint64Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(v))
+	}
+	return b, nil
+}
+
+// consumeSint64Slice wire decodes a []int64 pointer as a repeated Sint64.
+func consumeSint64Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, protowire.DecodeZigZag(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, protowire.DecodeZigZag(v))
+	out.n = n
+	return out, nil
+}
+
+var coderSint64Slice = pointerCoderFuncs{
+	size:      sizeSint64Slice,
+	marshal:   appendSint64Slice,
+	unmarshal: consumeSint64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeSint64PackedSlice returns the size of wire encoding a []int64 pointer as a packed repeated Sint64.
+func sizeSint64PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeZigZag(v))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendSint64PackedSlice encodes a []int64 pointer as a packed repeated Sint64.
+func appendSint64PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(protowire.EncodeZigZag(v))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(v))
+	}
+	return b, nil
+}
+
+var coderSint64PackedSlice = pointerCoderFuncs{
+	size:      sizeSint64PackedSlice,
+	marshal:   appendSint64PackedSlice,
+	unmarshal: consumeSint64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeSint64Value returns the size of wire encoding a int64 value as a Sint64.
+func sizeSint64Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v.Int()))
+}
+
+// appendSint64Value encodes a int64 value as a Sint64.
+func appendSint64Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, protowire.EncodeZigZag(v.Int()))
+	return b, nil
+}
+
+// consumeSint64Value decodes a int64 value as a Sint64.
+func consumeSint64Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)), out, nil
+}
+
+var coderSint64Value = valueCoderFuncs{
+	size:      sizeSint64Value,
+	marshal:   appendSint64Value,
+	unmarshal: consumeSint64Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeSint64SliceValue returns the size of wire encoding a []int64 value as a repeated Sint64.
+func sizeSint64SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(protowire.EncodeZigZag(v.Int()))
+	}
+	return size
+}
+
+// appendSint64SliceValue encodes a []int64 value as a repeated Sint64.
+func appendSint64SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(v.Int()))
+	}
+	return b, nil
+}
+
+// consumeSint64SliceValue wire decodes a []int64 value as a repeated Sint64.
+func consumeSint64SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderSint64SliceValue = valueCoderFuncs{
+	size:      sizeSint64SliceValue,
+	marshal:   appendSint64SliceValue,
+	unmarshal: consumeSint64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSint64PackedSliceValue returns the size of wire encoding a []int64 value as a packed repeated Sint64.
+func sizeSint64PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeZigZag(v.Int()))
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendSint64PackedSliceValue encodes a []int64 value as a packed repeated Sint64.
+func appendSint64PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(protowire.EncodeZigZag(v.Int()))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(v.Int()))
+	}
+	return b, nil
+}
+
+var coderSint64PackedSliceValue = valueCoderFuncs{
+	size:      sizeSint64PackedSliceValue,
+	marshal:   appendSint64PackedSliceValue,
+	unmarshal: consumeSint64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeUint64 returns the size of wire encoding a uint64 pointer as a Uint64.
+func sizeUint64(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint64()
+	return f.tagsize + protowire.SizeVarint(v)
+}
+
+// appendUint64 wire encodes a uint64 pointer as a Uint64.
+func appendUint64(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, v)
+	return b, nil
+}
+
+// consumeUint64 wire decodes a uint64 pointer as a Uint64.
+func consumeUint64(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Uint64() = v
+	out.n = n
+	return out, nil
+}
+
+var coderUint64 = pointerCoderFuncs{
+	size:      sizeUint64,
+	marshal:   appendUint64,
+	unmarshal: consumeUint64,
+	merge:     mergeUint64,
+}
+
+// sizeUint64NoZero returns the size of wire encoding a uint64 pointer as a Uint64.
+// The zero value is not encoded.
+func sizeUint64NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint64()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeVarint(v)
+}
+
+// appendUint64NoZero wire encodes a uint64 pointer as a Uint64.
+// The zero value is not encoded.
+func appendUint64NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint64()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, v)
+	return b, nil
+}
+
+var coderUint64NoZero = pointerCoderFuncs{
+	size:      sizeUint64NoZero,
+	marshal:   appendUint64NoZero,
+	unmarshal: consumeUint64,
+	merge:     mergeUint64NoZero,
+}
+
+// sizeUint64Ptr returns the size of wire encoding a *uint64 pointer as a Uint64.
+// It panics if the pointer is nil.
+func sizeUint64Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.Uint64Ptr()
+	return f.tagsize + protowire.SizeVarint(v)
+}
+
+// appendUint64Ptr wire encodes a *uint64 pointer as a Uint64.
+// It panics if the pointer is nil.
+func appendUint64Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Uint64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, v)
+	return b, nil
+}
+
+// consumeUint64Ptr wire decodes a *uint64 pointer as a Uint64.
+func consumeUint64Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Uint64Ptr()
+	if *vp == nil {
+		*vp = new(uint64)
+	}
+	**vp = v
+	out.n = n
+	return out, nil
+}
+
+var coderUint64Ptr = pointerCoderFuncs{
+	size:      sizeUint64Ptr,
+	marshal:   appendUint64Ptr,
+	unmarshal: consumeUint64Ptr,
+	merge:     mergeUint64Ptr,
+}
+
+// sizeUint64Slice returns the size of wire encoding a []uint64 pointer as a repeated Uint64.
+func sizeUint64Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint64Slice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeVarint(v)
+	}
+	return size
+}
+
+// appendUint64Slice encodes a []uint64 pointer as a repeated Uint64.
+func appendUint64Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, v)
+	}
+	return b, nil
+}
+
+// consumeUint64Slice wire decodes a []uint64 pointer as a repeated Uint64.
+func consumeUint64Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Uint64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, v)
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, v)
+	out.n = n
+	return out, nil
+}
+
+var coderUint64Slice = pointerCoderFuncs{
+	size:      sizeUint64Slice,
+	marshal:   appendUint64Slice,
+	unmarshal: consumeUint64Slice,
+	merge:     mergeUint64Slice,
+}
+
+// sizeUint64PackedSlice returns the size of wire encoding a []uint64 pointer as a packed repeated Uint64.
+func sizeUint64PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(v)
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendUint64PackedSlice encodes a []uint64 pointer as a packed repeated Uint64.
+func appendUint64PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for _, v := range s {
+		n += protowire.SizeVarint(v)
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendVarint(b, v)
+	}
+	return b, nil
+}
+
+var coderUint64PackedSlice = pointerCoderFuncs{
+	size:      sizeUint64PackedSlice,
+	marshal:   appendUint64PackedSlice,
+	unmarshal: consumeUint64Slice,
+	merge:     mergeUint64Slice,
+}
+
+// sizeUint64Value returns the size of wire encoding a uint64 value as a Uint64.
+func sizeUint64Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeVarint(v.Uint())
+}
+
+// appendUint64Value encodes a uint64 value as a Uint64.
+func appendUint64Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendVarint(b, v.Uint())
+	return b, nil
+}
+
+// consumeUint64Value decodes a uint64 value as a Uint64.
+func consumeUint64Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfUint64(v), out, nil
+}
+
+var coderUint64Value = valueCoderFuncs{
+	size:      sizeUint64Value,
+	marshal:   appendUint64Value,
+	unmarshal: consumeUint64Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeUint64SliceValue returns the size of wire encoding a []uint64 value as a repeated Uint64.
+func sizeUint64SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeVarint(v.Uint())
+	}
+	return size
+}
+
+// appendUint64SliceValue encodes a []uint64 value as a repeated Uint64.
+func appendUint64SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendVarint(b, v.Uint())
+	}
+	return b, nil
+}
+
+// consumeUint64SliceValue wire decodes a []uint64 value as a repeated Uint64.
+func consumeUint64SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			var v uint64
+			var n int
+			if len(b) >= 1 && b[0] < 0x80 {
+				v = uint64(b[0])
+				n = 1
+			} else if len(b) >= 2 && b[1] < 128 {
+				v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				n = 2
+			} else {
+				v, n = protowire.ConsumeVarint(b)
+			}
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfUint64(v))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	var v uint64
+	var n int
+	if len(b) >= 1 && b[0] < 0x80 {
+		v = uint64(b[0])
+		n = 1
+	} else if len(b) >= 2 && b[1] < 128 {
+		v = uint64(b[0]&0x7f) + uint64(b[1])<<7
+		n = 2
+	} else {
+		v, n = protowire.ConsumeVarint(b)
+	}
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfUint64(v))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderUint64SliceValue = valueCoderFuncs{
+	size:      sizeUint64SliceValue,
+	marshal:   appendUint64SliceValue,
+	unmarshal: consumeUint64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeUint64PackedSliceValue returns the size of wire encoding a []uint64 value as a packed repeated Uint64.
+func sizeUint64PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i, llen := 0, llen; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(v.Uint())
+	}
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendUint64PackedSliceValue encodes a []uint64 value as a packed repeated Uint64.
+func appendUint64PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		n += protowire.SizeVarint(v.Uint())
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, v.Uint())
+	}
+	return b, nil
+}
+
+var coderUint64PackedSliceValue = valueCoderFuncs{
+	size:      sizeUint64PackedSliceValue,
+	marshal:   appendUint64PackedSliceValue,
+	unmarshal: consumeUint64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSfixed32 returns the size of wire encoding a int32 pointer as a Sfixed32.
+func sizeSfixed32(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendSfixed32 wire encodes a int32 pointer as a Sfixed32.
+func appendSfixed32(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, uint32(v))
+	return b, nil
+}
+
+// consumeSfixed32 wire decodes a int32 pointer as a Sfixed32.
+func consumeSfixed32(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int32() = int32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed32 = pointerCoderFuncs{
+	size:      sizeSfixed32,
+	marshal:   appendSfixed32,
+	unmarshal: consumeSfixed32,
+	merge:     mergeInt32,
+}
+
+// sizeSfixed32NoZero returns the size of wire encoding a int32 pointer as a Sfixed32.
+// The zero value is not encoded.
+func sizeSfixed32NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int32()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendSfixed32NoZero wire encodes a int32 pointer as a Sfixed32.
+// The zero value is not encoded.
+func appendSfixed32NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int32()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, uint32(v))
+	return b, nil
+}
+
+var coderSfixed32NoZero = pointerCoderFuncs{
+	size:      sizeSfixed32NoZero,
+	marshal:   appendSfixed32NoZero,
+	unmarshal: consumeSfixed32,
+	merge:     mergeInt32NoZero,
+}
+
+// sizeSfixed32Ptr returns the size of wire encoding a *int32 pointer as a Sfixed32.
+// It panics if the pointer is nil.
+func sizeSfixed32Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendSfixed32Ptr wire encodes a *int32 pointer as a Sfixed32.
+// It panics if the pointer is nil.
+func appendSfixed32Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, uint32(v))
+	return b, nil
+}
+
+// consumeSfixed32Ptr wire decodes a *int32 pointer as a Sfixed32.
+func consumeSfixed32Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int32Ptr()
+	if *vp == nil {
+		*vp = new(int32)
+	}
+	**vp = int32(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed32Ptr = pointerCoderFuncs{
+	size:      sizeSfixed32Ptr,
+	marshal:   appendSfixed32Ptr,
+	unmarshal: consumeSfixed32Ptr,
+	merge:     mergeInt32Ptr,
+}
+
+// sizeSfixed32Slice returns the size of wire encoding a []int32 pointer as a repeated Sfixed32.
+func sizeSfixed32Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendSfixed32Slice encodes a []int32 pointer as a repeated Sfixed32.
+func appendSfixed32Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed32(b, uint32(v))
+	}
+	return b, nil
+}
+
+// consumeSfixed32Slice wire decodes a []int32 pointer as a repeated Sfixed32.
+func consumeSfixed32Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, int32(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, int32(v))
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed32Slice = pointerCoderFuncs{
+	size:      sizeSfixed32Slice,
+	marshal:   appendSfixed32Slice,
+	unmarshal: consumeSfixed32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeSfixed32PackedSlice returns the size of wire encoding a []int32 pointer as a packed repeated Sfixed32.
+func sizeSfixed32PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed32()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendSfixed32PackedSlice encodes a []int32 pointer as a packed repeated Sfixed32.
+func appendSfixed32PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed32(b, uint32(v))
+	}
+	return b, nil
+}
+
+var coderSfixed32PackedSlice = pointerCoderFuncs{
+	size:      sizeSfixed32PackedSlice,
+	marshal:   appendSfixed32PackedSlice,
+	unmarshal: consumeSfixed32Slice,
+	merge:     mergeInt32Slice,
+}
+
+// sizeSfixed32Value returns the size of wire encoding a int32 value as a Sfixed32.
+func sizeSfixed32Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed32()
+}
+
+// appendSfixed32Value encodes a int32 value as a Sfixed32.
+func appendSfixed32Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed32(b, uint32(v.Int()))
+	return b, nil
+}
+
+// consumeSfixed32Value decodes a int32 value as a Sfixed32.
+func consumeSfixed32Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt32(int32(v)), out, nil
+}
+
+var coderSfixed32Value = valueCoderFuncs{
+	size:      sizeSfixed32Value,
+	marshal:   appendSfixed32Value,
+	unmarshal: consumeSfixed32Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeSfixed32SliceValue returns the size of wire encoding a []int32 value as a repeated Sfixed32.
+func sizeSfixed32SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendSfixed32SliceValue encodes a []int32 value as a repeated Sfixed32.
+func appendSfixed32SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed32(b, uint32(v.Int()))
+	}
+	return b, nil
+}
+
+// consumeSfixed32SliceValue wire decodes a []int32 value as a repeated Sfixed32.
+func consumeSfixed32SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt32(int32(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt32(int32(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderSfixed32SliceValue = valueCoderFuncs{
+	size:      sizeSfixed32SliceValue,
+	marshal:   appendSfixed32SliceValue,
+	unmarshal: consumeSfixed32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSfixed32PackedSliceValue returns the size of wire encoding a []int32 value as a packed repeated Sfixed32.
+func sizeSfixed32PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed32()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendSfixed32PackedSliceValue encodes a []int32 value as a packed repeated Sfixed32.
+func appendSfixed32PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed32(b, uint32(v.Int()))
+	}
+	return b, nil
+}
+
+var coderSfixed32PackedSliceValue = valueCoderFuncs{
+	size:      sizeSfixed32PackedSliceValue,
+	marshal:   appendSfixed32PackedSliceValue,
+	unmarshal: consumeSfixed32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFixed32 returns the size of wire encoding a uint32 pointer as a Fixed32.
+func sizeFixed32(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFixed32 wire encodes a uint32 pointer as a Fixed32.
+func appendFixed32(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, v)
+	return b, nil
+}
+
+// consumeFixed32 wire decodes a uint32 pointer as a Fixed32.
+func consumeFixed32(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Uint32() = v
+	out.n = n
+	return out, nil
+}
+
+var coderFixed32 = pointerCoderFuncs{
+	size:      sizeFixed32,
+	marshal:   appendFixed32,
+	unmarshal: consumeFixed32,
+	merge:     mergeUint32,
+}
+
+// sizeFixed32NoZero returns the size of wire encoding a uint32 pointer as a Fixed32.
+// The zero value is not encoded.
+func sizeFixed32NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint32()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFixed32NoZero wire encodes a uint32 pointer as a Fixed32.
+// The zero value is not encoded.
+func appendFixed32NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint32()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, v)
+	return b, nil
+}
+
+var coderFixed32NoZero = pointerCoderFuncs{
+	size:      sizeFixed32NoZero,
+	marshal:   appendFixed32NoZero,
+	unmarshal: consumeFixed32,
+	merge:     mergeUint32NoZero,
+}
+
+// sizeFixed32Ptr returns the size of wire encoding a *uint32 pointer as a Fixed32.
+// It panics if the pointer is nil.
+func sizeFixed32Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFixed32Ptr wire encodes a *uint32 pointer as a Fixed32.
+// It panics if the pointer is nil.
+func appendFixed32Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Uint32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, v)
+	return b, nil
+}
+
+// consumeFixed32Ptr wire decodes a *uint32 pointer as a Fixed32.
+func consumeFixed32Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Uint32Ptr()
+	if *vp == nil {
+		*vp = new(uint32)
+	}
+	**vp = v
+	out.n = n
+	return out, nil
+}
+
+var coderFixed32Ptr = pointerCoderFuncs{
+	size:      sizeFixed32Ptr,
+	marshal:   appendFixed32Ptr,
+	unmarshal: consumeFixed32Ptr,
+	merge:     mergeUint32Ptr,
+}
+
+// sizeFixed32Slice returns the size of wire encoding a []uint32 pointer as a repeated Fixed32.
+func sizeFixed32Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint32Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendFixed32Slice encodes a []uint32 pointer as a repeated Fixed32.
+func appendFixed32Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed32(b, v)
+	}
+	return b, nil
+}
+
+// consumeFixed32Slice wire decodes a []uint32 pointer as a repeated Fixed32.
+func consumeFixed32Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Uint32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, v)
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, v)
+	out.n = n
+	return out, nil
+}
+
+var coderFixed32Slice = pointerCoderFuncs{
+	size:      sizeFixed32Slice,
+	marshal:   appendFixed32Slice,
+	unmarshal: consumeFixed32Slice,
+	merge:     mergeUint32Slice,
+}
+
+// sizeFixed32PackedSlice returns the size of wire encoding a []uint32 pointer as a packed repeated Fixed32.
+func sizeFixed32PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed32()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendFixed32PackedSlice encodes a []uint32 pointer as a packed repeated Fixed32.
+func appendFixed32PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed32(b, v)
+	}
+	return b, nil
+}
+
+var coderFixed32PackedSlice = pointerCoderFuncs{
+	size:      sizeFixed32PackedSlice,
+	marshal:   appendFixed32PackedSlice,
+	unmarshal: consumeFixed32Slice,
+	merge:     mergeUint32Slice,
+}
+
+// sizeFixed32Value returns the size of wire encoding a uint32 value as a Fixed32.
+func sizeFixed32Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed32()
+}
+
+// appendFixed32Value encodes a uint32 value as a Fixed32.
+func appendFixed32Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed32(b, uint32(v.Uint()))
+	return b, nil
+}
+
+// consumeFixed32Value decodes a uint32 value as a Fixed32.
+func consumeFixed32Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfUint32(uint32(v)), out, nil
+}
+
+var coderFixed32Value = valueCoderFuncs{
+	size:      sizeFixed32Value,
+	marshal:   appendFixed32Value,
+	unmarshal: consumeFixed32Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeFixed32SliceValue returns the size of wire encoding a []uint32 value as a repeated Fixed32.
+func sizeFixed32SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendFixed32SliceValue encodes a []uint32 value as a repeated Fixed32.
+func appendFixed32SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed32(b, uint32(v.Uint()))
+	}
+	return b, nil
+}
+
+// consumeFixed32SliceValue wire decodes a []uint32 value as a repeated Fixed32.
+func consumeFixed32SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfUint32(uint32(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfUint32(uint32(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderFixed32SliceValue = valueCoderFuncs{
+	size:      sizeFixed32SliceValue,
+	marshal:   appendFixed32SliceValue,
+	unmarshal: consumeFixed32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFixed32PackedSliceValue returns the size of wire encoding a []uint32 value as a packed repeated Fixed32.
+func sizeFixed32PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed32()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendFixed32PackedSliceValue encodes a []uint32 value as a packed repeated Fixed32.
+func appendFixed32PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed32(b, uint32(v.Uint()))
+	}
+	return b, nil
+}
+
+var coderFixed32PackedSliceValue = valueCoderFuncs{
+	size:      sizeFixed32PackedSliceValue,
+	marshal:   appendFixed32PackedSliceValue,
+	unmarshal: consumeFixed32SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFloat returns the size of wire encoding a float32 pointer as a Float.
+func sizeFloat(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFloat wire encodes a float32 pointer as a Float.
+func appendFloat(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Float32()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, math.Float32bits(v))
+	return b, nil
+}
+
+// consumeFloat wire decodes a float32 pointer as a Float.
+func consumeFloat(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Float32() = math.Float32frombits(v)
+	out.n = n
+	return out, nil
+}
+
+var coderFloat = pointerCoderFuncs{
+	size:      sizeFloat,
+	marshal:   appendFloat,
+	unmarshal: consumeFloat,
+	merge:     mergeFloat32,
+}
+
+// sizeFloatNoZero returns the size of wire encoding a float32 pointer as a Float.
+// The zero value is not encoded.
+func sizeFloatNoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Float32()
+	if v == 0 && !math.Signbit(float64(v)) {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFloatNoZero wire encodes a float32 pointer as a Float.
+// The zero value is not encoded.
+func appendFloatNoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Float32()
+	if v == 0 && !math.Signbit(float64(v)) {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, math.Float32bits(v))
+	return b, nil
+}
+
+var coderFloatNoZero = pointerCoderFuncs{
+	size:      sizeFloatNoZero,
+	marshal:   appendFloatNoZero,
+	unmarshal: consumeFloat,
+	merge:     mergeFloat32NoZero,
+}
+
+// sizeFloatPtr returns the size of wire encoding a *float32 pointer as a Float.
+// It panics if the pointer is nil.
+func sizeFloatPtr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed32()
+}
+
+// appendFloatPtr wire encodes a *float32 pointer as a Float.
+// It panics if the pointer is nil.
+func appendFloatPtr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Float32Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed32(b, math.Float32bits(v))
+	return b, nil
+}
+
+// consumeFloatPtr wire decodes a *float32 pointer as a Float.
+func consumeFloatPtr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Float32Ptr()
+	if *vp == nil {
+		*vp = new(float32)
+	}
+	**vp = math.Float32frombits(v)
+	out.n = n
+	return out, nil
+}
+
+var coderFloatPtr = pointerCoderFuncs{
+	size:      sizeFloatPtr,
+	marshal:   appendFloatPtr,
+	unmarshal: consumeFloatPtr,
+	merge:     mergeFloat32Ptr,
+}
+
+// sizeFloatSlice returns the size of wire encoding a []float32 pointer as a repeated Float.
+func sizeFloatSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Float32Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendFloatSlice encodes a []float32 pointer as a repeated Float.
+func appendFloatSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Float32Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed32(b, math.Float32bits(v))
+	}
+	return b, nil
+}
+
+// consumeFloatSlice wire decodes a []float32 pointer as a repeated Float.
+func consumeFloatSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Float32Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, math.Float32frombits(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, math.Float32frombits(v))
+	out.n = n
+	return out, nil
+}
+
+var coderFloatSlice = pointerCoderFuncs{
+	size:      sizeFloatSlice,
+	marshal:   appendFloatSlice,
+	unmarshal: consumeFloatSlice,
+	merge:     mergeFloat32Slice,
+}
+
+// sizeFloatPackedSlice returns the size of wire encoding a []float32 pointer as a packed repeated Float.
+func sizeFloatPackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Float32Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed32()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendFloatPackedSlice encodes a []float32 pointer as a packed repeated Float.
+func appendFloatPackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Float32Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed32(b, math.Float32bits(v))
+	}
+	return b, nil
+}
+
+var coderFloatPackedSlice = pointerCoderFuncs{
+	size:      sizeFloatPackedSlice,
+	marshal:   appendFloatPackedSlice,
+	unmarshal: consumeFloatSlice,
+	merge:     mergeFloat32Slice,
+}
+
+// sizeFloatValue returns the size of wire encoding a float32 value as a Float.
+func sizeFloatValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed32()
+}
+
+// appendFloatValue encodes a float32 value as a Float.
+func appendFloatValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed32(b, math.Float32bits(float32(v.Float())))
+	return b, nil
+}
+
+// consumeFloatValue decodes a float32 value as a Float.
+func consumeFloatValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))), out, nil
+}
+
+var coderFloatValue = valueCoderFuncs{
+	size:      sizeFloatValue,
+	marshal:   appendFloatValue,
+	unmarshal: consumeFloatValue,
+	merge:     mergeScalarValue,
+}
+
+// sizeFloatSliceValue returns the size of wire encoding a []float32 value as a repeated Float.
+func sizeFloatSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed32())
+	return size
+}
+
+// appendFloatSliceValue encodes a []float32 value as a repeated Float.
+func appendFloatSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed32(b, math.Float32bits(float32(v.Float())))
+	}
+	return b, nil
+}
+
+// consumeFloatSliceValue wire decodes a []float32 value as a repeated Float.
+func consumeFloatSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed32(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed32Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed32(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderFloatSliceValue = valueCoderFuncs{
+	size:      sizeFloatSliceValue,
+	marshal:   appendFloatSliceValue,
+	unmarshal: consumeFloatSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFloatPackedSliceValue returns the size of wire encoding a []float32 value as a packed repeated Float.
+func sizeFloatPackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed32()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendFloatPackedSliceValue encodes a []float32 value as a packed repeated Float.
+func appendFloatPackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed32()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed32(b, math.Float32bits(float32(v.Float())))
+	}
+	return b, nil
+}
+
+var coderFloatPackedSliceValue = valueCoderFuncs{
+	size:      sizeFloatPackedSliceValue,
+	marshal:   appendFloatPackedSliceValue,
+	unmarshal: consumeFloatSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSfixed64 returns the size of wire encoding a int64 pointer as a Sfixed64.
+func sizeSfixed64(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendSfixed64 wire encodes a int64 pointer as a Sfixed64.
+func appendSfixed64(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, uint64(v))
+	return b, nil
+}
+
+// consumeSfixed64 wire decodes a int64 pointer as a Sfixed64.
+func consumeSfixed64(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Int64() = int64(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed64 = pointerCoderFuncs{
+	size:      sizeSfixed64,
+	marshal:   appendSfixed64,
+	unmarshal: consumeSfixed64,
+	merge:     mergeInt64,
+}
+
+// sizeSfixed64NoZero returns the size of wire encoding a int64 pointer as a Sfixed64.
+// The zero value is not encoded.
+func sizeSfixed64NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Int64()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendSfixed64NoZero wire encodes a int64 pointer as a Sfixed64.
+// The zero value is not encoded.
+func appendSfixed64NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Int64()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, uint64(v))
+	return b, nil
+}
+
+var coderSfixed64NoZero = pointerCoderFuncs{
+	size:      sizeSfixed64NoZero,
+	marshal:   appendSfixed64NoZero,
+	unmarshal: consumeSfixed64,
+	merge:     mergeInt64NoZero,
+}
+
+// sizeSfixed64Ptr returns the size of wire encoding a *int64 pointer as a Sfixed64.
+// It panics if the pointer is nil.
+func sizeSfixed64Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendSfixed64Ptr wire encodes a *int64 pointer as a Sfixed64.
+// It panics if the pointer is nil.
+func appendSfixed64Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Int64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, uint64(v))
+	return b, nil
+}
+
+// consumeSfixed64Ptr wire decodes a *int64 pointer as a Sfixed64.
+func consumeSfixed64Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Int64Ptr()
+	if *vp == nil {
+		*vp = new(int64)
+	}
+	**vp = int64(v)
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed64Ptr = pointerCoderFuncs{
+	size:      sizeSfixed64Ptr,
+	marshal:   appendSfixed64Ptr,
+	unmarshal: consumeSfixed64Ptr,
+	merge:     mergeInt64Ptr,
+}
+
+// sizeSfixed64Slice returns the size of wire encoding a []int64 pointer as a repeated Sfixed64.
+func sizeSfixed64Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendSfixed64Slice encodes a []int64 pointer as a repeated Sfixed64.
+func appendSfixed64Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed64(b, uint64(v))
+	}
+	return b, nil
+}
+
+// consumeSfixed64Slice wire decodes a []int64 pointer as a repeated Sfixed64.
+func consumeSfixed64Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Int64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, int64(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, int64(v))
+	out.n = n
+	return out, nil
+}
+
+var coderSfixed64Slice = pointerCoderFuncs{
+	size:      sizeSfixed64Slice,
+	marshal:   appendSfixed64Slice,
+	unmarshal: consumeSfixed64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeSfixed64PackedSlice returns the size of wire encoding a []int64 pointer as a packed repeated Sfixed64.
+func sizeSfixed64PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed64()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendSfixed64PackedSlice encodes a []int64 pointer as a packed repeated Sfixed64.
+func appendSfixed64PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Int64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed64(b, uint64(v))
+	}
+	return b, nil
+}
+
+var coderSfixed64PackedSlice = pointerCoderFuncs{
+	size:      sizeSfixed64PackedSlice,
+	marshal:   appendSfixed64PackedSlice,
+	unmarshal: consumeSfixed64Slice,
+	merge:     mergeInt64Slice,
+}
+
+// sizeSfixed64Value returns the size of wire encoding a int64 value as a Sfixed64.
+func sizeSfixed64Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed64()
+}
+
+// appendSfixed64Value encodes a int64 value as a Sfixed64.
+func appendSfixed64Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed64(b, uint64(v.Int()))
+	return b, nil
+}
+
+// consumeSfixed64Value decodes a int64 value as a Sfixed64.
+func consumeSfixed64Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfInt64(int64(v)), out, nil
+}
+
+var coderSfixed64Value = valueCoderFuncs{
+	size:      sizeSfixed64Value,
+	marshal:   appendSfixed64Value,
+	unmarshal: consumeSfixed64Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeSfixed64SliceValue returns the size of wire encoding a []int64 value as a repeated Sfixed64.
+func sizeSfixed64SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendSfixed64SliceValue encodes a []int64 value as a repeated Sfixed64.
+func appendSfixed64SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed64(b, uint64(v.Int()))
+	}
+	return b, nil
+}
+
+// consumeSfixed64SliceValue wire decodes a []int64 value as a repeated Sfixed64.
+func consumeSfixed64SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfInt64(int64(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfInt64(int64(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderSfixed64SliceValue = valueCoderFuncs{
+	size:      sizeSfixed64SliceValue,
+	marshal:   appendSfixed64SliceValue,
+	unmarshal: consumeSfixed64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeSfixed64PackedSliceValue returns the size of wire encoding a []int64 value as a packed repeated Sfixed64.
+func sizeSfixed64PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed64()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendSfixed64PackedSliceValue encodes a []int64 value as a packed repeated Sfixed64.
+func appendSfixed64PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed64(b, uint64(v.Int()))
+	}
+	return b, nil
+}
+
+var coderSfixed64PackedSliceValue = valueCoderFuncs{
+	size:      sizeSfixed64PackedSliceValue,
+	marshal:   appendSfixed64PackedSliceValue,
+	unmarshal: consumeSfixed64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFixed64 returns the size of wire encoding a uint64 pointer as a Fixed64.
+func sizeFixed64(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendFixed64 wire encodes a uint64 pointer as a Fixed64.
+func appendFixed64(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, v)
+	return b, nil
+}
+
+// consumeFixed64 wire decodes a uint64 pointer as a Fixed64.
+func consumeFixed64(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Uint64() = v
+	out.n = n
+	return out, nil
+}
+
+var coderFixed64 = pointerCoderFuncs{
+	size:      sizeFixed64,
+	marshal:   appendFixed64,
+	unmarshal: consumeFixed64,
+	merge:     mergeUint64,
+}
+
+// sizeFixed64NoZero returns the size of wire encoding a uint64 pointer as a Fixed64.
+// The zero value is not encoded.
+func sizeFixed64NoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Uint64()
+	if v == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendFixed64NoZero wire encodes a uint64 pointer as a Fixed64.
+// The zero value is not encoded.
+func appendFixed64NoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Uint64()
+	if v == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, v)
+	return b, nil
+}
+
+var coderFixed64NoZero = pointerCoderFuncs{
+	size:      sizeFixed64NoZero,
+	marshal:   appendFixed64NoZero,
+	unmarshal: consumeFixed64,
+	merge:     mergeUint64NoZero,
+}
+
+// sizeFixed64Ptr returns the size of wire encoding a *uint64 pointer as a Fixed64.
+// It panics if the pointer is nil.
+func sizeFixed64Ptr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendFixed64Ptr wire encodes a *uint64 pointer as a Fixed64.
+// It panics if the pointer is nil.
+func appendFixed64Ptr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Uint64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, v)
+	return b, nil
+}
+
+// consumeFixed64Ptr wire decodes a *uint64 pointer as a Fixed64.
+func consumeFixed64Ptr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Uint64Ptr()
+	if *vp == nil {
+		*vp = new(uint64)
+	}
+	**vp = v
+	out.n = n
+	return out, nil
+}
+
+var coderFixed64Ptr = pointerCoderFuncs{
+	size:      sizeFixed64Ptr,
+	marshal:   appendFixed64Ptr,
+	unmarshal: consumeFixed64Ptr,
+	merge:     mergeUint64Ptr,
+}
+
+// sizeFixed64Slice returns the size of wire encoding a []uint64 pointer as a repeated Fixed64.
+func sizeFixed64Slice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint64Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendFixed64Slice encodes a []uint64 pointer as a repeated Fixed64.
+func appendFixed64Slice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed64(b, v)
+	}
+	return b, nil
+}
+
+// consumeFixed64Slice wire decodes a []uint64 pointer as a repeated Fixed64.
+func consumeFixed64Slice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Uint64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, v)
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, v)
+	out.n = n
+	return out, nil
+}
+
+var coderFixed64Slice = pointerCoderFuncs{
+	size:      sizeFixed64Slice,
+	marshal:   appendFixed64Slice,
+	unmarshal: consumeFixed64Slice,
+	merge:     mergeUint64Slice,
+}
+
+// sizeFixed64PackedSlice returns the size of wire encoding a []uint64 pointer as a packed repeated Fixed64.
+func sizeFixed64PackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Uint64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed64()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendFixed64PackedSlice encodes a []uint64 pointer as a packed repeated Fixed64.
+func appendFixed64PackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Uint64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed64(b, v)
+	}
+	return b, nil
+}
+
+var coderFixed64PackedSlice = pointerCoderFuncs{
+	size:      sizeFixed64PackedSlice,
+	marshal:   appendFixed64PackedSlice,
+	unmarshal: consumeFixed64Slice,
+	merge:     mergeUint64Slice,
+}
+
+// sizeFixed64Value returns the size of wire encoding a uint64 value as a Fixed64.
+func sizeFixed64Value(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed64()
+}
+
+// appendFixed64Value encodes a uint64 value as a Fixed64.
+func appendFixed64Value(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed64(b, v.Uint())
+	return b, nil
+}
+
+// consumeFixed64Value decodes a uint64 value as a Fixed64.
+func consumeFixed64Value(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfUint64(v), out, nil
+}
+
+var coderFixed64Value = valueCoderFuncs{
+	size:      sizeFixed64Value,
+	marshal:   appendFixed64Value,
+	unmarshal: consumeFixed64Value,
+	merge:     mergeScalarValue,
+}
+
+// sizeFixed64SliceValue returns the size of wire encoding a []uint64 value as a repeated Fixed64.
+func sizeFixed64SliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendFixed64SliceValue encodes a []uint64 value as a repeated Fixed64.
+func appendFixed64SliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed64(b, v.Uint())
+	}
+	return b, nil
+}
+
+// consumeFixed64SliceValue wire decodes a []uint64 value as a repeated Fixed64.
+func consumeFixed64SliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfUint64(v))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfUint64(v))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderFixed64SliceValue = valueCoderFuncs{
+	size:      sizeFixed64SliceValue,
+	marshal:   appendFixed64SliceValue,
+	unmarshal: consumeFixed64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeFixed64PackedSliceValue returns the size of wire encoding a []uint64 value as a packed repeated Fixed64.
+func sizeFixed64PackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed64()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendFixed64PackedSliceValue encodes a []uint64 value as a packed repeated Fixed64.
+func appendFixed64PackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed64(b, v.Uint())
+	}
+	return b, nil
+}
+
+var coderFixed64PackedSliceValue = valueCoderFuncs{
+	size:      sizeFixed64PackedSliceValue,
+	marshal:   appendFixed64PackedSliceValue,
+	unmarshal: consumeFixed64SliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeDouble returns the size of wire encoding a float64 pointer as a Double.
+func sizeDouble(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendDouble wire encodes a float64 pointer as a Double.
+func appendDouble(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Float64()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, math.Float64bits(v))
+	return b, nil
+}
+
+// consumeDouble wire decodes a float64 pointer as a Double.
+func consumeDouble(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Float64() = math.Float64frombits(v)
+	out.n = n
+	return out, nil
+}
+
+var coderDouble = pointerCoderFuncs{
+	size:      sizeDouble,
+	marshal:   appendDouble,
+	unmarshal: consumeDouble,
+	merge:     mergeFloat64,
+}
+
+// sizeDoubleNoZero returns the size of wire encoding a float64 pointer as a Double.
+// The zero value is not encoded.
+func sizeDoubleNoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Float64()
+	if v == 0 && !math.Signbit(float64(v)) {
+		return 0
+	}
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendDoubleNoZero wire encodes a float64 pointer as a Double.
+// The zero value is not encoded.
+func appendDoubleNoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Float64()
+	if v == 0 && !math.Signbit(float64(v)) {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, math.Float64bits(v))
+	return b, nil
+}
+
+var coderDoubleNoZero = pointerCoderFuncs{
+	size:      sizeDoubleNoZero,
+	marshal:   appendDoubleNoZero,
+	unmarshal: consumeDouble,
+	merge:     mergeFloat64NoZero,
+}
+
+// sizeDoublePtr returns the size of wire encoding a *float64 pointer as a Double.
+// It panics if the pointer is nil.
+func sizeDoublePtr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	return f.tagsize + protowire.SizeFixed64()
+}
+
+// appendDoublePtr wire encodes a *float64 pointer as a Double.
+// It panics if the pointer is nil.
+func appendDoublePtr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.Float64Ptr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendFixed64(b, math.Float64bits(v))
+	return b, nil
+}
+
+// consumeDoublePtr wire decodes a *float64 pointer as a Double.
+func consumeDoublePtr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.Float64Ptr()
+	if *vp == nil {
+		*vp = new(float64)
+	}
+	**vp = math.Float64frombits(v)
+	out.n = n
+	return out, nil
+}
+
+var coderDoublePtr = pointerCoderFuncs{
+	size:      sizeDoublePtr,
+	marshal:   appendDoublePtr,
+	unmarshal: consumeDoublePtr,
+	merge:     mergeFloat64Ptr,
+}
+
+// sizeDoubleSlice returns the size of wire encoding a []float64 pointer as a repeated Double.
+func sizeDoubleSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Float64Slice()
+	size = len(s) * (f.tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendDoubleSlice encodes a []float64 pointer as a repeated Double.
+func appendDoubleSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Float64Slice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendFixed64(b, math.Float64bits(v))
+	}
+	return b, nil
+}
+
+// consumeDoubleSlice wire decodes a []float64 pointer as a repeated Double.
+func consumeDoubleSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.Float64Slice()
+	if wtyp == protowire.BytesType {
+		s := *sp
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			s = append(s, math.Float64frombits(v))
+			b = b[n:]
+		}
+		*sp = s
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, math.Float64frombits(v))
+	out.n = n
+	return out, nil
+}
+
+var coderDoubleSlice = pointerCoderFuncs{
+	size:      sizeDoubleSlice,
+	marshal:   appendDoubleSlice,
+	unmarshal: consumeDoubleSlice,
+	merge:     mergeFloat64Slice,
+}
+
+// sizeDoublePackedSlice returns the size of wire encoding a []float64 pointer as a packed repeated Double.
+func sizeDoublePackedSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.Float64Slice()
+	if len(s) == 0 {
+		return 0
+	}
+	n := len(s) * protowire.SizeFixed64()
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+// appendDoublePackedSlice encodes a []float64 pointer as a packed repeated Double.
+func appendDoublePackedSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.Float64Slice()
+	if len(s) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := len(s) * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for _, v := range s {
+		b = protowire.AppendFixed64(b, math.Float64bits(v))
+	}
+	return b, nil
+}
+
+var coderDoublePackedSlice = pointerCoderFuncs{
+	size:      sizeDoublePackedSlice,
+	marshal:   appendDoublePackedSlice,
+	unmarshal: consumeDoubleSlice,
+	merge:     mergeFloat64Slice,
+}
+
+// sizeDoubleValue returns the size of wire encoding a float64 value as a Double.
+func sizeDoubleValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeFixed64()
+}
+
+// appendDoubleValue encodes a float64 value as a Double.
+func appendDoubleValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendFixed64(b, math.Float64bits(v.Float()))
+	return b, nil
+}
+
+// consumeDoubleValue decodes a float64 value as a Double.
+func consumeDoubleValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfFloat64(math.Float64frombits(v)), out, nil
+}
+
+var coderDoubleValue = valueCoderFuncs{
+	size:      sizeDoubleValue,
+	marshal:   appendDoubleValue,
+	unmarshal: consumeDoubleValue,
+	merge:     mergeScalarValue,
+}
+
+// sizeDoubleSliceValue returns the size of wire encoding a []float64 value as a repeated Double.
+func sizeDoubleSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	size = list.Len() * (tagsize + protowire.SizeFixed64())
+	return size
+}
+
+// appendDoubleSliceValue encodes a []float64 value as a repeated Double.
+func appendDoubleSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendFixed64(b, math.Float64bits(v.Float()))
+	}
+	return b, nil
+}
+
+// consumeDoubleSliceValue wire decodes a []float64 value as a repeated Double.
+func consumeDoubleSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return protoreflect.Value{}, out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeFixed64(b)
+			if n < 0 {
+				return protoreflect.Value{}, out, protowire.ParseError(n)
+			}
+			list.Append(protoreflect.ValueOfFloat64(math.Float64frombits(v)))
+			b = b[n:]
+		}
+		out.n = n
+		return listv, out, nil
+	}
+	if wtyp != protowire.Fixed64Type {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeFixed64(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfFloat64(math.Float64frombits(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderDoubleSliceValue = valueCoderFuncs{
+	size:      sizeDoubleSliceValue,
+	marshal:   appendDoubleSliceValue,
+	unmarshal: consumeDoubleSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeDoublePackedSliceValue returns the size of wire encoding a []float64 value as a packed repeated Double.
+func sizeDoublePackedSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := llen * protowire.SizeFixed64()
+	return tagsize + protowire.SizeBytes(n)
+}
+
+// appendDoublePackedSliceValue encodes a []float64 value as a packed repeated Double.
+func appendDoublePackedSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	llen := list.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, wiretag)
+	n := llen * protowire.SizeFixed64()
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendFixed64(b, math.Float64bits(v.Float()))
+	}
+	return b, nil
+}
+
+var coderDoublePackedSliceValue = valueCoderFuncs{
+	size:      sizeDoublePackedSliceValue,
+	marshal:   appendDoublePackedSliceValue,
+	unmarshal: consumeDoubleSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeString returns the size of wire encoding a string pointer as a String.
+func sizeString(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.String()
+	return f.tagsize + protowire.SizeBytes(len(v))
+}
+
+// appendString wire encodes a string pointer as a String.
+func appendString(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.String()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	return b, nil
+}
+
+// consumeString wire decodes a string pointer as a String.
+func consumeString(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.String() = v
+	out.n = n
+	return out, nil
+}
+
+var coderString = pointerCoderFuncs{
+	size:      sizeString,
+	marshal:   appendString,
+	unmarshal: consumeString,
+	merge:     mergeString,
+}
+
+// appendStringValidateUTF8 wire encodes a string pointer as a String.
+func appendStringValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.String()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	if !utf8.ValidString(v) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+// consumeStringValidateUTF8 wire decodes a string pointer as a String.
+func consumeStringValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.ValidString(v) {
+		return out, errInvalidUTF8{}
+	}
+	*p.String() = v
+	out.n = n
+	return out, nil
+}
+
+var coderStringValidateUTF8 = pointerCoderFuncs{
+	size:      sizeString,
+	marshal:   appendStringValidateUTF8,
+	unmarshal: consumeStringValidateUTF8,
+	merge:     mergeString,
+}
+
+// sizeStringNoZero returns the size of wire encoding a string pointer as a String.
+// The zero value is not encoded.
+func sizeStringNoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.String()
+	if len(v) == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeBytes(len(v))
+}
+
+// appendStringNoZero wire encodes a string pointer as a String.
+// The zero value is not encoded.
+func appendStringNoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.String()
+	if len(v) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	return b, nil
+}
+
+var coderStringNoZero = pointerCoderFuncs{
+	size:      sizeStringNoZero,
+	marshal:   appendStringNoZero,
+	unmarshal: consumeString,
+	merge:     mergeStringNoZero,
+}
+
+// appendStringNoZeroValidateUTF8 wire encodes a string pointer as a String.
+// The zero value is not encoded.
+func appendStringNoZeroValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.String()
+	if len(v) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	if !utf8.ValidString(v) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+var coderStringNoZeroValidateUTF8 = pointerCoderFuncs{
+	size:      sizeStringNoZero,
+	marshal:   appendStringNoZeroValidateUTF8,
+	unmarshal: consumeStringValidateUTF8,
+	merge:     mergeStringNoZero,
+}
+
+// sizeStringPtr returns the size of wire encoding a *string pointer as a String.
+// It panics if the pointer is nil.
+func sizeStringPtr(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := **p.StringPtr()
+	return f.tagsize + protowire.SizeBytes(len(v))
+}
+
+// appendStringPtr wire encodes a *string pointer as a String.
+// It panics if the pointer is nil.
+func appendStringPtr(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.StringPtr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	return b, nil
+}
+
+// consumeStringPtr wire decodes a *string pointer as a String.
+func consumeStringPtr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	vp := p.StringPtr()
+	if *vp == nil {
+		*vp = new(string)
+	}
+	**vp = v
+	out.n = n
+	return out, nil
+}
+
+var coderStringPtr = pointerCoderFuncs{
+	size:      sizeStringPtr,
+	marshal:   appendStringPtr,
+	unmarshal: consumeStringPtr,
+	merge:     mergeStringPtr,
+}
+
+// appendStringPtrValidateUTF8 wire encodes a *string pointer as a String.
+// It panics if the pointer is nil.
+func appendStringPtrValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := **p.StringPtr()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendString(b, v)
+	if !utf8.ValidString(v) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+// consumeStringPtrValidateUTF8 wire decodes a *string pointer as a String.
+func consumeStringPtrValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.ValidString(v) {
+		return out, errInvalidUTF8{}
+	}
+	vp := p.StringPtr()
+	if *vp == nil {
+		*vp = new(string)
+	}
+	**vp = v
+	out.n = n
+	return out, nil
+}
+
+var coderStringPtrValidateUTF8 = pointerCoderFuncs{
+	size:      sizeStringPtr,
+	marshal:   appendStringPtrValidateUTF8,
+	unmarshal: consumeStringPtrValidateUTF8,
+	merge:     mergeStringPtr,
+}
+
+// sizeStringSlice returns the size of wire encoding a []string pointer as a repeated String.
+func sizeStringSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.StringSlice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeBytes(len(v))
+	}
+	return size
+}
+
+// appendStringSlice encodes a []string pointer as a repeated String.
+func appendStringSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.StringSlice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendString(b, v)
+	}
+	return b, nil
+}
+
+// consumeStringSlice wire decodes a []string pointer as a repeated String.
+func consumeStringSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.StringSlice()
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, v)
+	out.n = n
+	return out, nil
+}
+
+var coderStringSlice = pointerCoderFuncs{
+	size:      sizeStringSlice,
+	marshal:   appendStringSlice,
+	unmarshal: consumeStringSlice,
+	merge:     mergeStringSlice,
+}
+
+// appendStringSliceValidateUTF8 encodes a []string pointer as a repeated String.
+func appendStringSliceValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.StringSlice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendString(b, v)
+		if !utf8.ValidString(v) {
+			return b, errInvalidUTF8{}
+		}
+	}
+	return b, nil
+}
+
+// consumeStringSliceValidateUTF8 wire decodes a []string pointer as a repeated String.
+func consumeStringSliceValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.StringSlice()
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.ValidString(v) {
+		return out, errInvalidUTF8{}
+	}
+	*sp = append(*sp, v)
+	out.n = n
+	return out, nil
+}
+
+var coderStringSliceValidateUTF8 = pointerCoderFuncs{
+	size:      sizeStringSlice,
+	marshal:   appendStringSliceValidateUTF8,
+	unmarshal: consumeStringSliceValidateUTF8,
+	merge:     mergeStringSlice,
+}
+
+// sizeStringValue returns the size of wire encoding a string value as a String.
+func sizeStringValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeBytes(len(v.String()))
+}
+
+// appendStringValue encodes a string value as a String.
+func appendStringValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendString(b, v.String())
+	return b, nil
+}
+
+// consumeStringValue decodes a string value as a String.
+func consumeStringValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfString(string(v)), out, nil
+}
+
+var coderStringValue = valueCoderFuncs{
+	size:      sizeStringValue,
+	marshal:   appendStringValue,
+	unmarshal: consumeStringValue,
+	merge:     mergeScalarValue,
+}
+
+// appendStringValueValidateUTF8 encodes a string value as a String.
+func appendStringValueValidateUTF8(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendString(b, v.String())
+	if !utf8.ValidString(v.String()) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+// consumeStringValueValidateUTF8 decodes a string value as a String.
+func consumeStringValueValidateUTF8(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	if !utf8.ValidString(v) {
+		return protoreflect.Value{}, out, errInvalidUTF8{}
+	}
+	out.n = n
+	return protoreflect.ValueOfString(string(v)), out, nil
+}
+
+var coderStringValueValidateUTF8 = valueCoderFuncs{
+	size:      sizeStringValue,
+	marshal:   appendStringValueValidateUTF8,
+	unmarshal: consumeStringValueValidateUTF8,
+	merge:     mergeScalarValue,
+}
+
+// sizeStringSliceValue returns the size of wire encoding a []string value as a repeated String.
+func sizeStringSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeBytes(len(v.String()))
+	}
+	return size
+}
+
+// appendStringSliceValue encodes a []string value as a repeated String.
+func appendStringSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendString(b, v.String())
+	}
+	return b, nil
+}
+
+// consumeStringSliceValue wire decodes a []string value as a repeated String.
+func consumeStringSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp != protowire.BytesType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeString(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfString(string(v)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderStringSliceValue = valueCoderFuncs{
+	size:      sizeStringSliceValue,
+	marshal:   appendStringSliceValue,
+	unmarshal: consumeStringSliceValue,
+	merge:     mergeListValue,
+}
+
+// sizeBytes returns the size of wire encoding a []byte pointer as a Bytes.
+func sizeBytes(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Bytes()
+	return f.tagsize + protowire.SizeBytes(len(v))
+}
+
+// appendBytes wire encodes a []byte pointer as a Bytes.
+func appendBytes(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bytes()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendBytes(b, v)
+	return b, nil
+}
+
+// consumeBytes wire decodes a []byte pointer as a Bytes.
+func consumeBytes(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Bytes() = append(emptyBuf[:], v...)
+	out.n = n
+	return out, nil
+}
+
+var coderBytes = pointerCoderFuncs{
+	size:      sizeBytes,
+	marshal:   appendBytes,
+	unmarshal: consumeBytes,
+	merge:     mergeBytes,
+}
+
+// appendBytesValidateUTF8 wire encodes a []byte pointer as a Bytes.
+func appendBytesValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bytes()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendBytes(b, v)
+	if !utf8.Valid(v) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+// consumeBytesValidateUTF8 wire decodes a []byte pointer as a Bytes.
+func consumeBytesValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.Valid(v) {
+		return out, errInvalidUTF8{}
+	}
+	*p.Bytes() = append(emptyBuf[:], v...)
+	out.n = n
+	return out, nil
+}
+
+var coderBytesValidateUTF8 = pointerCoderFuncs{
+	size:      sizeBytes,
+	marshal:   appendBytesValidateUTF8,
+	unmarshal: consumeBytesValidateUTF8,
+	merge:     mergeBytes,
+}
+
+// sizeBytesNoZero returns the size of wire encoding a []byte pointer as a Bytes.
+// The zero value is not encoded.
+func sizeBytesNoZero(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := *p.Bytes()
+	if len(v) == 0 {
+		return 0
+	}
+	return f.tagsize + protowire.SizeBytes(len(v))
+}
+
+// appendBytesNoZero wire encodes a []byte pointer as a Bytes.
+// The zero value is not encoded.
+func appendBytesNoZero(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bytes()
+	if len(v) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendBytes(b, v)
+	return b, nil
+}
+
+// consumeBytesNoZero wire decodes a []byte pointer as a Bytes.
+// The zero value is not decoded.
+func consumeBytesNoZero(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*p.Bytes() = append(([]byte)(nil), v...)
+	out.n = n
+	return out, nil
+}
+
+var coderBytesNoZero = pointerCoderFuncs{
+	size:      sizeBytesNoZero,
+	marshal:   appendBytesNoZero,
+	unmarshal: consumeBytesNoZero,
+	merge:     mergeBytesNoZero,
+}
+
+// appendBytesNoZeroValidateUTF8 wire encodes a []byte pointer as a Bytes.
+// The zero value is not encoded.
+func appendBytesNoZeroValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	v := *p.Bytes()
+	if len(v) == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendBytes(b, v)
+	if !utf8.Valid(v) {
+		return b, errInvalidUTF8{}
+	}
+	return b, nil
+}
+
+// consumeBytesNoZeroValidateUTF8 wire decodes a []byte pointer as a Bytes.
+func consumeBytesNoZeroValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.Valid(v) {
+		return out, errInvalidUTF8{}
+	}
+	*p.Bytes() = append(([]byte)(nil), v...)
+	out.n = n
+	return out, nil
+}
+
+var coderBytesNoZeroValidateUTF8 = pointerCoderFuncs{
+	size:      sizeBytesNoZero,
+	marshal:   appendBytesNoZeroValidateUTF8,
+	unmarshal: consumeBytesNoZeroValidateUTF8,
+	merge:     mergeBytesNoZero,
+}
+
+// sizeBytesSlice returns the size of wire encoding a [][]byte pointer as a repeated Bytes.
+func sizeBytesSlice(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	s := *p.BytesSlice()
+	for _, v := range s {
+		size += f.tagsize + protowire.SizeBytes(len(v))
+	}
+	return size
+}
+
+// appendBytesSlice encodes a [][]byte pointer as a repeated Bytes.
+func appendBytesSlice(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.BytesSlice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendBytes(b, v)
+	}
+	return b, nil
+}
+
+// consumeBytesSlice wire decodes a [][]byte pointer as a repeated Bytes.
+func consumeBytesSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.BytesSlice()
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	*sp = append(*sp, append(emptyBuf[:], v...))
+	out.n = n
+	return out, nil
+}
+
+var coderBytesSlice = pointerCoderFuncs{
+	size:      sizeBytesSlice,
+	marshal:   appendBytesSlice,
+	unmarshal: consumeBytesSlice,
+	merge:     mergeBytesSlice,
+}
+
+// appendBytesSliceValidateUTF8 encodes a [][]byte pointer as a repeated Bytes.
+func appendBytesSliceValidateUTF8(b []byte, p pointer, f *coderFieldInfo, _ marshalOptions) ([]byte, error) {
+	s := *p.BytesSlice()
+	for _, v := range s {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendBytes(b, v)
+		if !utf8.Valid(v) {
+			return b, errInvalidUTF8{}
+		}
+	}
+	return b, nil
+}
+
+// consumeBytesSliceValidateUTF8 wire decodes a [][]byte pointer as a repeated Bytes.
+func consumeBytesSliceValidateUTF8(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	sp := p.BytesSlice()
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	if !utf8.Valid(v) {
+		return out, errInvalidUTF8{}
+	}
+	*sp = append(*sp, append(emptyBuf[:], v...))
+	out.n = n
+	return out, nil
+}
+
+var coderBytesSliceValidateUTF8 = pointerCoderFuncs{
+	size:      sizeBytesSlice,
+	marshal:   appendBytesSliceValidateUTF8,
+	unmarshal: consumeBytesSliceValidateUTF8,
+	merge:     mergeBytesSlice,
+}
+
+// sizeBytesValue returns the size of wire encoding a []byte value as a Bytes.
+func sizeBytesValue(v protoreflect.Value, tagsize int, _ marshalOptions) int {
+	return tagsize + protowire.SizeBytes(len(v.Bytes()))
+}
+
+// appendBytesValue encodes a []byte value as a Bytes.
+func appendBytesValue(b []byte, v protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	b = protowire.AppendVarint(b, wiretag)
+	b = protowire.AppendBytes(b, v.Bytes())
+	return b, nil
+}
+
+// consumeBytesValue decodes a []byte value as a Bytes.
+func consumeBytesValue(b []byte, _ protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	out.n = n
+	return protoreflect.ValueOfBytes(append(emptyBuf[:], v...)), out, nil
+}
+
+var coderBytesValue = valueCoderFuncs{
+	size:      sizeBytesValue,
+	marshal:   appendBytesValue,
+	unmarshal: consumeBytesValue,
+	merge:     mergeBytesValue,
+}
+
+// sizeBytesSliceValue returns the size of wire encoding a [][]byte value as a repeated Bytes.
+func sizeBytesSliceValue(listv protoreflect.Value, tagsize int, _ marshalOptions) (size int) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		size += tagsize + protowire.SizeBytes(len(v.Bytes()))
+	}
+	return size
+}
+
+// appendBytesSliceValue encodes a [][]byte value as a repeated Bytes.
+func appendBytesSliceValue(b []byte, listv protoreflect.Value, wiretag uint64, _ marshalOptions) ([]byte, error) {
+	list := listv.List()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		v := list.Get(i)
+		b = protowire.AppendVarint(b, wiretag)
+		b = protowire.AppendBytes(b, v.Bytes())
+	}
+	return b, nil
+}
+
+// consumeBytesSliceValue wire decodes a [][]byte value as a repeated Bytes.
+func consumeBytesSliceValue(b []byte, listv protoreflect.Value, _ protowire.Number, wtyp protowire.Type, _ unmarshalOptions) (_ protoreflect.Value, out unmarshalOutput, err error) {
+	list := listv.List()
+	if wtyp != protowire.BytesType {
+		return protoreflect.Value{}, out, errUnknown
+	}
+	v, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return protoreflect.Value{}, out, protowire.ParseError(n)
+	}
+	list.Append(protoreflect.ValueOfBytes(append(emptyBuf[:], v...)))
+	out.n = n
+	return listv, out, nil
+}
+
+var coderBytesSliceValue = valueCoderFuncs{
+	size:      sizeBytesSliceValue,
+	marshal:   appendBytesSliceValue,
+	unmarshal: consumeBytesSliceValue,
+	merge:     mergeBytesListValue,
+}
+
+// We append to an empty array rather than a nil []byte to get non-nil zero-length byte slices.
+var emptyBuf [0]byte
+
+var wireTypes = map[protoreflect.Kind]protowire.Type{
+	protoreflect.BoolKind:     protowire.VarintType,
+	protoreflect.EnumKind:     protowire.VarintType,
+	protoreflect.Int32Kind:    protowire.VarintType,
+	protoreflect.Sint32Kind:   protowire.VarintType,
+	protoreflect.Uint32Kind:   protowire.VarintType,
+	protoreflect.Int64Kind:    protowire.VarintType,
+	protoreflect.Sint64Kind:   protowire.VarintType,
+	protoreflect.Uint64Kind:   protowire.VarintType,
+	protoreflect.Sfixed32Kind: protowire.Fixed32Type,
+	protoreflect.Fixed32Kind:  protowire.Fixed32Type,
+	protoreflect.FloatKind:    protowire.Fixed32Type,
+	protoreflect.Sfixed64Kind: protowire.Fixed64Type,
+	protoreflect.Fixed64Kind:  protowire.Fixed64Type,
+	protoreflect.DoubleKind:   protowire.Fixed64Type,
+	protoreflect.StringKind:   protowire.BytesType,
+	protoreflect.BytesKind:    protowire.BytesType,
+	protoreflect.MessageKind:  protowire.BytesType,
+	protoreflect.GroupKind:    protowire.StartGroupType,
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_map.go b/vendor/google.golang.org/protobuf/internal/impl/codec_map.go
new file mode 100644
index 0000000..35a67c2
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_map.go
@@ -0,0 +1,388 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"errors"
+	"reflect"
+	"sort"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type mapInfo struct {
+	goType     reflect.Type
+	keyWiretag uint64
+	valWiretag uint64
+	keyFuncs   valueCoderFuncs
+	valFuncs   valueCoderFuncs
+	keyZero    pref.Value
+	keyKind    pref.Kind
+	conv       *mapConverter
+}
+
+func encoderFuncsForMap(fd pref.FieldDescriptor, ft reflect.Type) (valueMessage *MessageInfo, funcs pointerCoderFuncs) {
+	// TODO: Consider generating specialized map coders.
+	keyField := fd.MapKey()
+	valField := fd.MapValue()
+	keyWiretag := protowire.EncodeTag(1, wireTypes[keyField.Kind()])
+	valWiretag := protowire.EncodeTag(2, wireTypes[valField.Kind()])
+	keyFuncs := encoderFuncsForValue(keyField)
+	valFuncs := encoderFuncsForValue(valField)
+	conv := newMapConverter(ft, fd)
+
+	mapi := &mapInfo{
+		goType:     ft,
+		keyWiretag: keyWiretag,
+		valWiretag: valWiretag,
+		keyFuncs:   keyFuncs,
+		valFuncs:   valFuncs,
+		keyZero:    keyField.Default(),
+		keyKind:    keyField.Kind(),
+		conv:       conv,
+	}
+	if valField.Kind() == pref.MessageKind {
+		valueMessage = getMessageInfo(ft.Elem())
+	}
+
+	funcs = pointerCoderFuncs{
+		size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
+			return sizeMap(p.AsValueOf(ft).Elem(), mapi, f, opts)
+		},
+		marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+			return appendMap(b, p.AsValueOf(ft).Elem(), mapi, f, opts)
+		},
+		unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
+			mp := p.AsValueOf(ft)
+			if mp.Elem().IsNil() {
+				mp.Elem().Set(reflect.MakeMap(mapi.goType))
+			}
+			if f.mi == nil {
+				return consumeMap(b, mp.Elem(), wtyp, mapi, f, opts)
+			} else {
+				return consumeMapOfMessage(b, mp.Elem(), wtyp, mapi, f, opts)
+			}
+		},
+	}
+	switch valField.Kind() {
+	case pref.MessageKind:
+		funcs.merge = mergeMapOfMessage
+	case pref.BytesKind:
+		funcs.merge = mergeMapOfBytes
+	default:
+		funcs.merge = mergeMap
+	}
+	if valFuncs.isInit != nil {
+		funcs.isInit = func(p pointer, f *coderFieldInfo) error {
+			return isInitMap(p.AsValueOf(ft).Elem(), mapi, f)
+		}
+	}
+	return valueMessage, funcs
+}
+
+const (
+	mapKeyTagSize = 1 // field 1, tag size 1.
+	mapValTagSize = 1 // field 2, tag size 2.
+)
+
+func sizeMap(mapv reflect.Value, mapi *mapInfo, f *coderFieldInfo, opts marshalOptions) int {
+	if mapv.Len() == 0 {
+		return 0
+	}
+	n := 0
+	iter := mapRange(mapv)
+	for iter.Next() {
+		key := mapi.conv.keyConv.PBValueOf(iter.Key()).MapKey()
+		keySize := mapi.keyFuncs.size(key.Value(), mapKeyTagSize, opts)
+		var valSize int
+		value := mapi.conv.valConv.PBValueOf(iter.Value())
+		if f.mi == nil {
+			valSize = mapi.valFuncs.size(value, mapValTagSize, opts)
+		} else {
+			p := pointerOfValue(iter.Value())
+			valSize += mapValTagSize
+			valSize += protowire.SizeBytes(f.mi.sizePointer(p, opts))
+		}
+		n += f.tagsize + protowire.SizeBytes(keySize+valSize)
+	}
+	return n
+}
+
+func consumeMap(b []byte, mapv reflect.Value, wtyp protowire.Type, mapi *mapInfo, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	b, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	var (
+		key = mapi.keyZero
+		val = mapi.conv.valConv.New()
+	)
+	for len(b) > 0 {
+		num, wtyp, n := protowire.ConsumeTag(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		if num > protowire.MaxValidNumber {
+			return out, errors.New("invalid field number")
+		}
+		b = b[n:]
+		err := errUnknown
+		switch num {
+		case 1:
+			var v pref.Value
+			var o unmarshalOutput
+			v, o, err = mapi.keyFuncs.unmarshal(b, key, num, wtyp, opts)
+			if err != nil {
+				break
+			}
+			key = v
+			n = o.n
+		case 2:
+			var v pref.Value
+			var o unmarshalOutput
+			v, o, err = mapi.valFuncs.unmarshal(b, val, num, wtyp, opts)
+			if err != nil {
+				break
+			}
+			val = v
+			n = o.n
+		}
+		if err == errUnknown {
+			n = protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+		} else if err != nil {
+			return out, err
+		}
+		b = b[n:]
+	}
+	mapv.SetMapIndex(mapi.conv.keyConv.GoValueOf(key), mapi.conv.valConv.GoValueOf(val))
+	out.n = n
+	return out, nil
+}
+
+func consumeMapOfMessage(b []byte, mapv reflect.Value, wtyp protowire.Type, mapi *mapInfo, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.BytesType {
+		return out, errUnknown
+	}
+	b, n := protowire.ConsumeBytes(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	var (
+		key = mapi.keyZero
+		val = reflect.New(f.mi.GoReflectType.Elem())
+	)
+	for len(b) > 0 {
+		num, wtyp, n := protowire.ConsumeTag(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		if num > protowire.MaxValidNumber {
+			return out, errors.New("invalid field number")
+		}
+		b = b[n:]
+		err := errUnknown
+		switch num {
+		case 1:
+			var v pref.Value
+			var o unmarshalOutput
+			v, o, err = mapi.keyFuncs.unmarshal(b, key, num, wtyp, opts)
+			if err != nil {
+				break
+			}
+			key = v
+			n = o.n
+		case 2:
+			if wtyp != protowire.BytesType {
+				break
+			}
+			var v []byte
+			v, n = protowire.ConsumeBytes(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			var o unmarshalOutput
+			o, err = f.mi.unmarshalPointer(v, pointerOfValue(val), 0, opts)
+			if o.initialized {
+				// Consider this map item initialized so long as we see
+				// an initialized value.
+				out.initialized = true
+			}
+		}
+		if err == errUnknown {
+			n = protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+		} else if err != nil {
+			return out, err
+		}
+		b = b[n:]
+	}
+	mapv.SetMapIndex(mapi.conv.keyConv.GoValueOf(key), val)
+	out.n = n
+	return out, nil
+}
+
+func appendMapItem(b []byte, keyrv, valrv reflect.Value, mapi *mapInfo, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	if f.mi == nil {
+		key := mapi.conv.keyConv.PBValueOf(keyrv).MapKey()
+		val := mapi.conv.valConv.PBValueOf(valrv)
+		size := 0
+		size += mapi.keyFuncs.size(key.Value(), mapKeyTagSize, opts)
+		size += mapi.valFuncs.size(val, mapValTagSize, opts)
+		b = protowire.AppendVarint(b, uint64(size))
+		b, err := mapi.keyFuncs.marshal(b, key.Value(), mapi.keyWiretag, opts)
+		if err != nil {
+			return nil, err
+		}
+		return mapi.valFuncs.marshal(b, val, mapi.valWiretag, opts)
+	} else {
+		key := mapi.conv.keyConv.PBValueOf(keyrv).MapKey()
+		val := pointerOfValue(valrv)
+		valSize := f.mi.sizePointer(val, opts)
+		size := 0
+		size += mapi.keyFuncs.size(key.Value(), mapKeyTagSize, opts)
+		size += mapValTagSize + protowire.SizeBytes(valSize)
+		b = protowire.AppendVarint(b, uint64(size))
+		b, err := mapi.keyFuncs.marshal(b, key.Value(), mapi.keyWiretag, opts)
+		if err != nil {
+			return nil, err
+		}
+		b = protowire.AppendVarint(b, mapi.valWiretag)
+		b = protowire.AppendVarint(b, uint64(valSize))
+		return f.mi.marshalAppendPointer(b, val, opts)
+	}
+}
+
+func appendMap(b []byte, mapv reflect.Value, mapi *mapInfo, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	if mapv.Len() == 0 {
+		return b, nil
+	}
+	if opts.Deterministic() {
+		return appendMapDeterministic(b, mapv, mapi, f, opts)
+	}
+	iter := mapRange(mapv)
+	for iter.Next() {
+		var err error
+		b = protowire.AppendVarint(b, f.wiretag)
+		b, err = appendMapItem(b, iter.Key(), iter.Value(), mapi, f, opts)
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func appendMapDeterministic(b []byte, mapv reflect.Value, mapi *mapInfo, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	keys := mapv.MapKeys()
+	sort.Slice(keys, func(i, j int) bool {
+		switch keys[i].Kind() {
+		case reflect.Bool:
+			return !keys[i].Bool() && keys[j].Bool()
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			return keys[i].Int() < keys[j].Int()
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+			return keys[i].Uint() < keys[j].Uint()
+		case reflect.Float32, reflect.Float64:
+			return keys[i].Float() < keys[j].Float()
+		case reflect.String:
+			return keys[i].String() < keys[j].String()
+		default:
+			panic("invalid kind: " + keys[i].Kind().String())
+		}
+	})
+	for _, key := range keys {
+		var err error
+		b = protowire.AppendVarint(b, f.wiretag)
+		b, err = appendMapItem(b, key, mapv.MapIndex(key), mapi, f, opts)
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func isInitMap(mapv reflect.Value, mapi *mapInfo, f *coderFieldInfo) error {
+	if mi := f.mi; mi != nil {
+		mi.init()
+		if !mi.needsInitCheck {
+			return nil
+		}
+		iter := mapRange(mapv)
+		for iter.Next() {
+			val := pointerOfValue(iter.Value())
+			if err := mi.checkInitializedPointer(val); err != nil {
+				return err
+			}
+		}
+	} else {
+		iter := mapRange(mapv)
+		for iter.Next() {
+			val := mapi.conv.valConv.PBValueOf(iter.Value())
+			if err := mapi.valFuncs.isInit(val); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func mergeMap(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+	dstm := dst.AsValueOf(f.ft).Elem()
+	srcm := src.AsValueOf(f.ft).Elem()
+	if srcm.Len() == 0 {
+		return
+	}
+	if dstm.IsNil() {
+		dstm.Set(reflect.MakeMap(f.ft))
+	}
+	iter := mapRange(srcm)
+	for iter.Next() {
+		dstm.SetMapIndex(iter.Key(), iter.Value())
+	}
+}
+
+func mergeMapOfBytes(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+	dstm := dst.AsValueOf(f.ft).Elem()
+	srcm := src.AsValueOf(f.ft).Elem()
+	if srcm.Len() == 0 {
+		return
+	}
+	if dstm.IsNil() {
+		dstm.Set(reflect.MakeMap(f.ft))
+	}
+	iter := mapRange(srcm)
+	for iter.Next() {
+		dstm.SetMapIndex(iter.Key(), reflect.ValueOf(append(emptyBuf[:], iter.Value().Bytes()...)))
+	}
+}
+
+func mergeMapOfMessage(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+	dstm := dst.AsValueOf(f.ft).Elem()
+	srcm := src.AsValueOf(f.ft).Elem()
+	if srcm.Len() == 0 {
+		return
+	}
+	if dstm.IsNil() {
+		dstm.Set(reflect.MakeMap(f.ft))
+	}
+	iter := mapRange(srcm)
+	for iter.Next() {
+		val := reflect.New(f.ft.Elem().Elem())
+		if f.mi != nil {
+			f.mi.mergePointer(pointerOfValue(val), pointerOfValue(iter.Value()), opts)
+		} else {
+			opts.Merge(asMessage(val), asMessage(iter.Value()))
+		}
+		dstm.SetMapIndex(iter.Key(), val)
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_map_go111.go b/vendor/google.golang.org/protobuf/internal/impl/codec_map_go111.go
new file mode 100644
index 0000000..2706bb6
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_map_go111.go
@@ -0,0 +1,37 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !go1.12
+
+package impl
+
+import "reflect"
+
+type mapIter struct {
+	v    reflect.Value
+	keys []reflect.Value
+}
+
+// mapRange provides a less-efficient equivalent to
+// the Go 1.12 reflect.Value.MapRange method.
+func mapRange(v reflect.Value) *mapIter {
+	return &mapIter{v: v}
+}
+
+func (i *mapIter) Next() bool {
+	if i.keys == nil {
+		i.keys = i.v.MapKeys()
+	} else {
+		i.keys = i.keys[1:]
+	}
+	return len(i.keys) > 0
+}
+
+func (i *mapIter) Key() reflect.Value {
+	return i.keys[0]
+}
+
+func (i *mapIter) Value() reflect.Value {
+	return i.v.MapIndex(i.keys[0])
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_map_go112.go b/vendor/google.golang.org/protobuf/internal/impl/codec_map_go112.go
new file mode 100644
index 0000000..1533ef6
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_map_go112.go
@@ -0,0 +1,11 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.12
+
+package impl
+
+import "reflect"
+
+func mapRange(v reflect.Value) *reflect.MapIter { return v.MapRange() }
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_message.go b/vendor/google.golang.org/protobuf/internal/impl/codec_message.go
new file mode 100644
index 0000000..0e176d5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_message.go
@@ -0,0 +1,159 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"sort"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/fieldsort"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// coderMessageInfo contains per-message information used by the fast-path functions.
+// This is a different type from MessageInfo to keep MessageInfo as general-purpose as
+// possible.
+type coderMessageInfo struct {
+	methods piface.Methods
+
+	orderedCoderFields []*coderFieldInfo
+	denseCoderFields   []*coderFieldInfo
+	coderFields        map[protowire.Number]*coderFieldInfo
+	sizecacheOffset    offset
+	unknownOffset      offset
+	extensionOffset    offset
+	needsInitCheck     bool
+	isMessageSet       bool
+	numRequiredFields  uint8
+}
+
+type coderFieldInfo struct {
+	funcs      pointerCoderFuncs // fast-path per-field functions
+	mi         *MessageInfo      // field's message
+	ft         reflect.Type
+	validation validationInfo   // information used by message validation
+	num        pref.FieldNumber // field number
+	offset     offset           // struct field offset
+	wiretag    uint64           // field tag (number + wire type)
+	tagsize    int              // size of the varint-encoded tag
+	isPointer  bool             // true if IsNil may be called on the struct field
+	isRequired bool             // true if field is required
+}
+
+func (mi *MessageInfo) makeCoderMethods(t reflect.Type, si structInfo) {
+	mi.sizecacheOffset = si.sizecacheOffset
+	mi.unknownOffset = si.unknownOffset
+	mi.extensionOffset = si.extensionOffset
+
+	mi.coderFields = make(map[protowire.Number]*coderFieldInfo)
+	fields := mi.Desc.Fields()
+	preallocFields := make([]coderFieldInfo, fields.Len())
+	for i := 0; i < fields.Len(); i++ {
+		fd := fields.Get(i)
+
+		fs := si.fieldsByNumber[fd.Number()]
+		isOneof := fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic()
+		if isOneof {
+			fs = si.oneofsByName[fd.ContainingOneof().Name()]
+		}
+		ft := fs.Type
+		var wiretag uint64
+		if !fd.IsPacked() {
+			wiretag = protowire.EncodeTag(fd.Number(), wireTypes[fd.Kind()])
+		} else {
+			wiretag = protowire.EncodeTag(fd.Number(), protowire.BytesType)
+		}
+		var fieldOffset offset
+		var funcs pointerCoderFuncs
+		var childMessage *MessageInfo
+		switch {
+		case isOneof:
+			fieldOffset = offsetOf(fs, mi.Exporter)
+		case fd.IsWeak():
+			fieldOffset = si.weakOffset
+			funcs = makeWeakMessageFieldCoder(fd)
+		default:
+			fieldOffset = offsetOf(fs, mi.Exporter)
+			childMessage, funcs = fieldCoder(fd, ft)
+		}
+		cf := &preallocFields[i]
+		*cf = coderFieldInfo{
+			num:        fd.Number(),
+			offset:     fieldOffset,
+			wiretag:    wiretag,
+			ft:         ft,
+			tagsize:    protowire.SizeVarint(wiretag),
+			funcs:      funcs,
+			mi:         childMessage,
+			validation: newFieldValidationInfo(mi, si, fd, ft),
+			isPointer:  fd.Cardinality() == pref.Repeated || fd.HasPresence(),
+			isRequired: fd.Cardinality() == pref.Required,
+		}
+		mi.orderedCoderFields = append(mi.orderedCoderFields, cf)
+		mi.coderFields[cf.num] = cf
+	}
+	for i, oneofs := 0, mi.Desc.Oneofs(); i < oneofs.Len(); i++ {
+		if od := oneofs.Get(i); !od.IsSynthetic() {
+			mi.initOneofFieldCoders(od, si)
+		}
+	}
+	if messageset.IsMessageSet(mi.Desc) {
+		if !mi.extensionOffset.IsValid() {
+			panic(fmt.Sprintf("%v: MessageSet with no extensions field", mi.Desc.FullName()))
+		}
+		if !mi.unknownOffset.IsValid() {
+			panic(fmt.Sprintf("%v: MessageSet with no unknown field", mi.Desc.FullName()))
+		}
+		mi.isMessageSet = true
+	}
+	sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
+		return mi.orderedCoderFields[i].num < mi.orderedCoderFields[j].num
+	})
+
+	var maxDense pref.FieldNumber
+	for _, cf := range mi.orderedCoderFields {
+		if cf.num >= 16 && cf.num >= 2*maxDense {
+			break
+		}
+		maxDense = cf.num
+	}
+	mi.denseCoderFields = make([]*coderFieldInfo, maxDense+1)
+	for _, cf := range mi.orderedCoderFields {
+		if int(cf.num) >= len(mi.denseCoderFields) {
+			break
+		}
+		mi.denseCoderFields[cf.num] = cf
+	}
+
+	// To preserve compatibility with historic wire output, marshal oneofs last.
+	if mi.Desc.Oneofs().Len() > 0 {
+		sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
+			fi := fields.ByNumber(mi.orderedCoderFields[i].num)
+			fj := fields.ByNumber(mi.orderedCoderFields[j].num)
+			return fieldsort.Less(fi, fj)
+		})
+	}
+
+	mi.needsInitCheck = needsInitCheck(mi.Desc)
+	if mi.methods.Marshal == nil && mi.methods.Size == nil {
+		mi.methods.Flags |= piface.SupportMarshalDeterministic
+		mi.methods.Marshal = mi.marshal
+		mi.methods.Size = mi.size
+	}
+	if mi.methods.Unmarshal == nil {
+		mi.methods.Flags |= piface.SupportUnmarshalDiscardUnknown
+		mi.methods.Unmarshal = mi.unmarshal
+	}
+	if mi.methods.CheckInitialized == nil {
+		mi.methods.CheckInitialized = mi.checkInitialized
+	}
+	if mi.methods.Merge == nil {
+		mi.methods.Merge = mi.merge
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_messageset.go b/vendor/google.golang.org/protobuf/internal/impl/codec_messageset.go
new file mode 100644
index 0000000..cfb68e1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_messageset.go
@@ -0,0 +1,120 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"sort"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
+)
+
+func sizeMessageSet(mi *MessageInfo, p pointer, opts marshalOptions) (size int) {
+	if !flags.ProtoLegacy {
+		return 0
+	}
+
+	ext := *p.Apply(mi.extensionOffset).Extensions()
+	for _, x := range ext {
+		xi := getExtensionFieldInfo(x.Type())
+		if xi.funcs.size == nil {
+			continue
+		}
+		num, _ := protowire.DecodeTag(xi.wiretag)
+		size += messageset.SizeField(num)
+		size += xi.funcs.size(x.Value(), protowire.SizeTag(messageset.FieldMessage), opts)
+	}
+
+	unknown := *p.Apply(mi.unknownOffset).Bytes()
+	size += messageset.SizeUnknown(unknown)
+
+	return size
+}
+
+func marshalMessageSet(mi *MessageInfo, b []byte, p pointer, opts marshalOptions) ([]byte, error) {
+	if !flags.ProtoLegacy {
+		return b, errors.New("no support for message_set_wire_format")
+	}
+
+	ext := *p.Apply(mi.extensionOffset).Extensions()
+	switch len(ext) {
+	case 0:
+	case 1:
+		// Fast-path for one extension: Don't bother sorting the keys.
+		for _, x := range ext {
+			var err error
+			b, err = marshalMessageSetField(mi, b, x, opts)
+			if err != nil {
+				return b, err
+			}
+		}
+	default:
+		// Sort the keys to provide a deterministic encoding.
+		// Not sure this is required, but the old code does it.
+		keys := make([]int, 0, len(ext))
+		for k := range ext {
+			keys = append(keys, int(k))
+		}
+		sort.Ints(keys)
+		for _, k := range keys {
+			var err error
+			b, err = marshalMessageSetField(mi, b, ext[int32(k)], opts)
+			if err != nil {
+				return b, err
+			}
+		}
+	}
+
+	unknown := *p.Apply(mi.unknownOffset).Bytes()
+	b, err := messageset.AppendUnknown(b, unknown)
+	if err != nil {
+		return b, err
+	}
+
+	return b, nil
+}
+
+func marshalMessageSetField(mi *MessageInfo, b []byte, x ExtensionField, opts marshalOptions) ([]byte, error) {
+	xi := getExtensionFieldInfo(x.Type())
+	num, _ := protowire.DecodeTag(xi.wiretag)
+	b = messageset.AppendFieldStart(b, num)
+	b, err := xi.funcs.marshal(b, x.Value(), protowire.EncodeTag(messageset.FieldMessage, protowire.BytesType), opts)
+	if err != nil {
+		return b, err
+	}
+	b = messageset.AppendFieldEnd(b)
+	return b, nil
+}
+
+func unmarshalMessageSet(mi *MessageInfo, b []byte, p pointer, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if !flags.ProtoLegacy {
+		return out, errors.New("no support for message_set_wire_format")
+	}
+
+	ep := p.Apply(mi.extensionOffset).Extensions()
+	if *ep == nil {
+		*ep = make(map[int32]ExtensionField)
+	}
+	ext := *ep
+	unknown := p.Apply(mi.unknownOffset).Bytes()
+	initialized := true
+	err = messageset.Unmarshal(b, true, func(num protowire.Number, v []byte) error {
+		o, err := mi.unmarshalExtension(v, num, protowire.BytesType, ext, opts)
+		if err == errUnknown {
+			*unknown = protowire.AppendTag(*unknown, num, protowire.BytesType)
+			*unknown = append(*unknown, v...)
+			return nil
+		}
+		if !o.initialized {
+			initialized = false
+		}
+		return err
+	})
+	out.n = len(b)
+	out.initialized = initialized
+	return out, err
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_reflect.go b/vendor/google.golang.org/protobuf/internal/impl/codec_reflect.go
new file mode 100644
index 0000000..86f7dc3
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_reflect.go
@@ -0,0 +1,209 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build purego appengine
+
+package impl
+
+import (
+	"reflect"
+
+	"google.golang.org/protobuf/encoding/protowire"
+)
+
+func sizeEnum(p pointer, f *coderFieldInfo, _ marshalOptions) (size int) {
+	v := p.v.Elem().Int()
+	return f.tagsize + protowire.SizeVarint(uint64(v))
+}
+
+func appendEnum(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	v := p.v.Elem().Int()
+	b = protowire.AppendVarint(b, f.wiretag)
+	b = protowire.AppendVarint(b, uint64(v))
+	return b, nil
+}
+
+func consumeEnum(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, _ unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeVarint(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	p.v.Elem().SetInt(int64(v))
+	out.n = n
+	return out, nil
+}
+
+func mergeEnum(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	dst.v.Elem().Set(src.v.Elem())
+}
+
+var coderEnum = pointerCoderFuncs{
+	size:      sizeEnum,
+	marshal:   appendEnum,
+	unmarshal: consumeEnum,
+	merge:     mergeEnum,
+}
+
+func sizeEnumNoZero(p pointer, f *coderFieldInfo, opts marshalOptions) (size int) {
+	if p.v.Elem().Int() == 0 {
+		return 0
+	}
+	return sizeEnum(p, f, opts)
+}
+
+func appendEnumNoZero(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	if p.v.Elem().Int() == 0 {
+		return b, nil
+	}
+	return appendEnum(b, p, f, opts)
+}
+
+func mergeEnumNoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	if src.v.Elem().Int() != 0 {
+		dst.v.Elem().Set(src.v.Elem())
+	}
+}
+
+var coderEnumNoZero = pointerCoderFuncs{
+	size:      sizeEnumNoZero,
+	marshal:   appendEnumNoZero,
+	unmarshal: consumeEnum,
+	merge:     mergeEnumNoZero,
+}
+
+func sizeEnumPtr(p pointer, f *coderFieldInfo, opts marshalOptions) (size int) {
+	return sizeEnum(pointer{p.v.Elem()}, f, opts)
+}
+
+func appendEnumPtr(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	return appendEnum(b, pointer{p.v.Elem()}, f, opts)
+}
+
+func consumeEnumPtr(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	if p.v.Elem().IsNil() {
+		p.v.Elem().Set(reflect.New(p.v.Elem().Type().Elem()))
+	}
+	return consumeEnum(b, pointer{p.v.Elem()}, wtyp, f, opts)
+}
+
+func mergeEnumPtr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	if !src.v.Elem().IsNil() {
+		v := reflect.New(dst.v.Type().Elem().Elem())
+		v.Elem().Set(src.v.Elem().Elem())
+		dst.v.Elem().Set(v)
+	}
+}
+
+var coderEnumPtr = pointerCoderFuncs{
+	size:      sizeEnumPtr,
+	marshal:   appendEnumPtr,
+	unmarshal: consumeEnumPtr,
+	merge:     mergeEnumPtr,
+}
+
+func sizeEnumSlice(p pointer, f *coderFieldInfo, opts marshalOptions) (size int) {
+	s := p.v.Elem()
+	for i, llen := 0, s.Len(); i < llen; i++ {
+		size += protowire.SizeVarint(uint64(s.Index(i).Int())) + f.tagsize
+	}
+	return size
+}
+
+func appendEnumSlice(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	s := p.v.Elem()
+	for i, llen := 0, s.Len(); i < llen; i++ {
+		b = protowire.AppendVarint(b, f.wiretag)
+		b = protowire.AppendVarint(b, uint64(s.Index(i).Int()))
+	}
+	return b, nil
+}
+
+func consumeEnumSlice(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	s := p.v.Elem()
+	if wtyp == protowire.BytesType {
+		b, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, protowire.ParseError(n)
+		}
+		for len(b) > 0 {
+			v, n := protowire.ConsumeVarint(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			rv := reflect.New(s.Type().Elem()).Elem()
+			rv.SetInt(int64(v))
+			s.Set(reflect.Append(s, rv))
+			b = b[n:]
+		}
+		out.n = n
+		return out, nil
+	}
+	if wtyp != protowire.VarintType {
+		return out, errUnknown
+	}
+	v, n := protowire.ConsumeVarint(b)
+	if n < 0 {
+		return out, protowire.ParseError(n)
+	}
+	rv := reflect.New(s.Type().Elem()).Elem()
+	rv.SetInt(int64(v))
+	s.Set(reflect.Append(s, rv))
+	out.n = n
+	return out, nil
+}
+
+func mergeEnumSlice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	dst.v.Elem().Set(reflect.AppendSlice(dst.v.Elem(), src.v.Elem()))
+}
+
+var coderEnumSlice = pointerCoderFuncs{
+	size:      sizeEnumSlice,
+	marshal:   appendEnumSlice,
+	unmarshal: consumeEnumSlice,
+	merge:     mergeEnumSlice,
+}
+
+func sizeEnumPackedSlice(p pointer, f *coderFieldInfo, opts marshalOptions) (size int) {
+	s := p.v.Elem()
+	llen := s.Len()
+	if llen == 0 {
+		return 0
+	}
+	n := 0
+	for i := 0; i < llen; i++ {
+		n += protowire.SizeVarint(uint64(s.Index(i).Int()))
+	}
+	return f.tagsize + protowire.SizeBytes(n)
+}
+
+func appendEnumPackedSlice(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
+	s := p.v.Elem()
+	llen := s.Len()
+	if llen == 0 {
+		return b, nil
+	}
+	b = protowire.AppendVarint(b, f.wiretag)
+	n := 0
+	for i := 0; i < llen; i++ {
+		n += protowire.SizeVarint(uint64(s.Index(i).Int()))
+	}
+	b = protowire.AppendVarint(b, uint64(n))
+	for i := 0; i < llen; i++ {
+		b = protowire.AppendVarint(b, uint64(s.Index(i).Int()))
+	}
+	return b, nil
+}
+
+var coderEnumPackedSlice = pointerCoderFuncs{
+	size:      sizeEnumPackedSlice,
+	marshal:   appendEnumPackedSlice,
+	unmarshal: consumeEnumSlice,
+	merge:     mergeEnumSlice,
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go b/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go
new file mode 100644
index 0000000..e899712
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_tables.go
@@ -0,0 +1,557 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// pointerCoderFuncs is a set of pointer encoding functions.
+type pointerCoderFuncs struct {
+	mi        *MessageInfo
+	size      func(p pointer, f *coderFieldInfo, opts marshalOptions) int
+	marshal   func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error)
+	unmarshal func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error)
+	isInit    func(p pointer, f *coderFieldInfo) error
+	merge     func(dst, src pointer, f *coderFieldInfo, opts mergeOptions)
+}
+
+// valueCoderFuncs is a set of protoreflect.Value encoding functions.
+type valueCoderFuncs struct {
+	size      func(v pref.Value, tagsize int, opts marshalOptions) int
+	marshal   func(b []byte, v pref.Value, wiretag uint64, opts marshalOptions) ([]byte, error)
+	unmarshal func(b []byte, v pref.Value, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (pref.Value, unmarshalOutput, error)
+	isInit    func(v pref.Value) error
+	merge     func(dst, src pref.Value, opts mergeOptions) pref.Value
+}
+
+// fieldCoder returns pointer functions for a field, used for operating on
+// struct fields.
+func fieldCoder(fd pref.FieldDescriptor, ft reflect.Type) (*MessageInfo, pointerCoderFuncs) {
+	switch {
+	case fd.IsMap():
+		return encoderFuncsForMap(fd, ft)
+	case fd.Cardinality() == pref.Repeated && !fd.IsPacked():
+		// Repeated fields (not packed).
+		if ft.Kind() != reflect.Slice {
+			break
+		}
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolSlice
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumSlice
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32Slice
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32Slice
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32Slice
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64Slice
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64Slice
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64Slice
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32Slice
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32Slice
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatSlice
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64Slice
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64Slice
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoubleSlice
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringSliceValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringSlice
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesSliceValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesSlice
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringSlice
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesSlice
+			}
+		case pref.MessageKind:
+			return getMessageInfo(ft), makeMessageSliceFieldCoder(fd, ft)
+		case pref.GroupKind:
+			return getMessageInfo(ft), makeGroupSliceFieldCoder(fd, ft)
+		}
+	case fd.Cardinality() == pref.Repeated && fd.IsPacked():
+		// Packed repeated fields.
+		//
+		// Only repeated fields of primitive numeric types
+		// (Varint, Fixed32, or Fixed64 wire type) can be packed.
+		if ft.Kind() != reflect.Slice {
+			break
+		}
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolPackedSlice
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumPackedSlice
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32PackedSlice
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32PackedSlice
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32PackedSlice
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64PackedSlice
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64PackedSlice
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64PackedSlice
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32PackedSlice
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32PackedSlice
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatPackedSlice
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64PackedSlice
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64PackedSlice
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoublePackedSlice
+			}
+		}
+	case fd.Kind() == pref.MessageKind:
+		return getMessageInfo(ft), makeMessageFieldCoder(fd, ft)
+	case fd.Kind() == pref.GroupKind:
+		return getMessageInfo(ft), makeGroupFieldCoder(fd, ft)
+	case fd.Syntax() == pref.Proto3 && fd.ContainingOneof() == nil:
+		// Populated oneof fields always encode even if set to the zero value,
+		// which normally are not encoded in proto3.
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolNoZero
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumNoZero
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32NoZero
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32NoZero
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32NoZero
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64NoZero
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64NoZero
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64NoZero
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32NoZero
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32NoZero
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatNoZero
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64NoZero
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64NoZero
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoubleNoZero
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringNoZeroValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringNoZero
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesNoZeroValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesNoZero
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringNoZero
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytesNoZero
+			}
+		}
+	case ft.Kind() == reflect.Ptr:
+		ft := ft.Elem()
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBoolPtr
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnumPtr
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32Ptr
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32Ptr
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32Ptr
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64Ptr
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64Ptr
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64Ptr
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32Ptr
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32Ptr
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloatPtr
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64Ptr
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64Ptr
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDoublePtr
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringPtrValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderStringPtr
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderStringPtr
+			}
+		}
+	default:
+		switch fd.Kind() {
+		case pref.BoolKind:
+			if ft.Kind() == reflect.Bool {
+				return nil, coderBool
+			}
+		case pref.EnumKind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderEnum
+			}
+		case pref.Int32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderInt32
+			}
+		case pref.Sint32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSint32
+			}
+		case pref.Uint32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderUint32
+			}
+		case pref.Int64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderInt64
+			}
+		case pref.Sint64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSint64
+			}
+		case pref.Uint64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderUint64
+			}
+		case pref.Sfixed32Kind:
+			if ft.Kind() == reflect.Int32 {
+				return nil, coderSfixed32
+			}
+		case pref.Fixed32Kind:
+			if ft.Kind() == reflect.Uint32 {
+				return nil, coderFixed32
+			}
+		case pref.FloatKind:
+			if ft.Kind() == reflect.Float32 {
+				return nil, coderFloat
+			}
+		case pref.Sfixed64Kind:
+			if ft.Kind() == reflect.Int64 {
+				return nil, coderSfixed64
+			}
+		case pref.Fixed64Kind:
+			if ft.Kind() == reflect.Uint64 {
+				return nil, coderFixed64
+			}
+		case pref.DoubleKind:
+			if ft.Kind() == reflect.Float64 {
+				return nil, coderDouble
+			}
+		case pref.StringKind:
+			if ft.Kind() == reflect.String && strs.EnforceUTF8(fd) {
+				return nil, coderStringValidateUTF8
+			}
+			if ft.Kind() == reflect.String {
+				return nil, coderString
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 && strs.EnforceUTF8(fd) {
+				return nil, coderBytesValidateUTF8
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytes
+			}
+		case pref.BytesKind:
+			if ft.Kind() == reflect.String {
+				return nil, coderString
+			}
+			if ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8 {
+				return nil, coderBytes
+			}
+		}
+	}
+	panic(fmt.Sprintf("invalid type: no encoder for %v %v %v/%v", fd.FullName(), fd.Cardinality(), fd.Kind(), ft))
+}
+
+// encoderFuncsForValue returns value functions for a field, used for
+// extension values and map encoding.
+func encoderFuncsForValue(fd pref.FieldDescriptor) valueCoderFuncs {
+	switch {
+	case fd.Cardinality() == pref.Repeated && !fd.IsPacked():
+		switch fd.Kind() {
+		case pref.BoolKind:
+			return coderBoolSliceValue
+		case pref.EnumKind:
+			return coderEnumSliceValue
+		case pref.Int32Kind:
+			return coderInt32SliceValue
+		case pref.Sint32Kind:
+			return coderSint32SliceValue
+		case pref.Uint32Kind:
+			return coderUint32SliceValue
+		case pref.Int64Kind:
+			return coderInt64SliceValue
+		case pref.Sint64Kind:
+			return coderSint64SliceValue
+		case pref.Uint64Kind:
+			return coderUint64SliceValue
+		case pref.Sfixed32Kind:
+			return coderSfixed32SliceValue
+		case pref.Fixed32Kind:
+			return coderFixed32SliceValue
+		case pref.FloatKind:
+			return coderFloatSliceValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64SliceValue
+		case pref.Fixed64Kind:
+			return coderFixed64SliceValue
+		case pref.DoubleKind:
+			return coderDoubleSliceValue
+		case pref.StringKind:
+			// We don't have a UTF-8 validating coder for repeated string fields.
+			// Value coders are used for extensions and maps.
+			// Extensions are never proto3, and maps never contain lists.
+			return coderStringSliceValue
+		case pref.BytesKind:
+			return coderBytesSliceValue
+		case pref.MessageKind:
+			return coderMessageSliceValue
+		case pref.GroupKind:
+			return coderGroupSliceValue
+		}
+	case fd.Cardinality() == pref.Repeated && fd.IsPacked():
+		switch fd.Kind() {
+		case pref.BoolKind:
+			return coderBoolPackedSliceValue
+		case pref.EnumKind:
+			return coderEnumPackedSliceValue
+		case pref.Int32Kind:
+			return coderInt32PackedSliceValue
+		case pref.Sint32Kind:
+			return coderSint32PackedSliceValue
+		case pref.Uint32Kind:
+			return coderUint32PackedSliceValue
+		case pref.Int64Kind:
+			return coderInt64PackedSliceValue
+		case pref.Sint64Kind:
+			return coderSint64PackedSliceValue
+		case pref.Uint64Kind:
+			return coderUint64PackedSliceValue
+		case pref.Sfixed32Kind:
+			return coderSfixed32PackedSliceValue
+		case pref.Fixed32Kind:
+			return coderFixed32PackedSliceValue
+		case pref.FloatKind:
+			return coderFloatPackedSliceValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64PackedSliceValue
+		case pref.Fixed64Kind:
+			return coderFixed64PackedSliceValue
+		case pref.DoubleKind:
+			return coderDoublePackedSliceValue
+		}
+	default:
+		switch fd.Kind() {
+		default:
+		case pref.BoolKind:
+			return coderBoolValue
+		case pref.EnumKind:
+			return coderEnumValue
+		case pref.Int32Kind:
+			return coderInt32Value
+		case pref.Sint32Kind:
+			return coderSint32Value
+		case pref.Uint32Kind:
+			return coderUint32Value
+		case pref.Int64Kind:
+			return coderInt64Value
+		case pref.Sint64Kind:
+			return coderSint64Value
+		case pref.Uint64Kind:
+			return coderUint64Value
+		case pref.Sfixed32Kind:
+			return coderSfixed32Value
+		case pref.Fixed32Kind:
+			return coderFixed32Value
+		case pref.FloatKind:
+			return coderFloatValue
+		case pref.Sfixed64Kind:
+			return coderSfixed64Value
+		case pref.Fixed64Kind:
+			return coderFixed64Value
+		case pref.DoubleKind:
+			return coderDoubleValue
+		case pref.StringKind:
+			if strs.EnforceUTF8(fd) {
+				return coderStringValueValidateUTF8
+			}
+			return coderStringValue
+		case pref.BytesKind:
+			return coderBytesValue
+		case pref.MessageKind:
+			return coderMessageValue
+		case pref.GroupKind:
+			return coderGroupValue
+		}
+	}
+	panic(fmt.Sprintf("invalid field: no encoder for %v %v %v", fd.FullName(), fd.Cardinality(), fd.Kind()))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go b/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go
new file mode 100644
index 0000000..e118af1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_unsafe.go
@@ -0,0 +1,17 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !purego,!appengine
+
+package impl
+
+// When using unsafe pointers, we can just treat enum values as int32s.
+
+var (
+	coderEnumNoZero      = coderInt32NoZero
+	coderEnum            = coderInt32
+	coderEnumPtr         = coderInt32Ptr
+	coderEnumSlice       = coderInt32Slice
+	coderEnumPackedSlice = coderInt32PackedSlice
+)
diff --git a/vendor/google.golang.org/protobuf/internal/impl/convert.go b/vendor/google.golang.org/protobuf/internal/impl/convert.go
new file mode 100644
index 0000000..36a90df
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/convert.go
@@ -0,0 +1,467 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// unwrapper unwraps the value to the underlying value.
+// This is implemented by List and Map.
+type unwrapper interface {
+	protoUnwrap() interface{}
+}
+
+// A Converter coverts to/from Go reflect.Value types and protobuf protoreflect.Value types.
+type Converter interface {
+	// PBValueOf converts a reflect.Value to a protoreflect.Value.
+	PBValueOf(reflect.Value) pref.Value
+
+	// GoValueOf converts a protoreflect.Value to a reflect.Value.
+	GoValueOf(pref.Value) reflect.Value
+
+	// IsValidPB returns whether a protoreflect.Value is compatible with this type.
+	IsValidPB(pref.Value) bool
+
+	// IsValidGo returns whether a reflect.Value is compatible with this type.
+	IsValidGo(reflect.Value) bool
+
+	// New returns a new field value.
+	// For scalars, it returns the default value of the field.
+	// For composite types, it returns a new mutable value.
+	New() pref.Value
+
+	// Zero returns a new field value.
+	// For scalars, it returns the default value of the field.
+	// For composite types, it returns an immutable, empty value.
+	Zero() pref.Value
+}
+
+// NewConverter matches a Go type with a protobuf field and returns a Converter
+// that converts between the two. Enums must be a named int32 kind that
+// implements protoreflect.Enum, and messages must be pointer to a named
+// struct type that implements protoreflect.ProtoMessage.
+//
+// This matcher deliberately supports a wider range of Go types than what
+// protoc-gen-go historically generated to be able to automatically wrap some
+// v1 messages generated by other forks of protoc-gen-go.
+func NewConverter(t reflect.Type, fd pref.FieldDescriptor) Converter {
+	switch {
+	case fd.IsList():
+		return newListConverter(t, fd)
+	case fd.IsMap():
+		return newMapConverter(t, fd)
+	default:
+		return newSingularConverter(t, fd)
+	}
+	panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
+}
+
+var (
+	boolType    = reflect.TypeOf(bool(false))
+	int32Type   = reflect.TypeOf(int32(0))
+	int64Type   = reflect.TypeOf(int64(0))
+	uint32Type  = reflect.TypeOf(uint32(0))
+	uint64Type  = reflect.TypeOf(uint64(0))
+	float32Type = reflect.TypeOf(float32(0))
+	float64Type = reflect.TypeOf(float64(0))
+	stringType  = reflect.TypeOf(string(""))
+	bytesType   = reflect.TypeOf([]byte(nil))
+	byteType    = reflect.TypeOf(byte(0))
+)
+
+var (
+	boolZero    = pref.ValueOfBool(false)
+	int32Zero   = pref.ValueOfInt32(0)
+	int64Zero   = pref.ValueOfInt64(0)
+	uint32Zero  = pref.ValueOfUint32(0)
+	uint64Zero  = pref.ValueOfUint64(0)
+	float32Zero = pref.ValueOfFloat32(0)
+	float64Zero = pref.ValueOfFloat64(0)
+	stringZero  = pref.ValueOfString("")
+	bytesZero   = pref.ValueOfBytes(nil)
+)
+
+func newSingularConverter(t reflect.Type, fd pref.FieldDescriptor) Converter {
+	defVal := func(fd pref.FieldDescriptor, zero pref.Value) pref.Value {
+		if fd.Cardinality() == pref.Repeated {
+			// Default isn't defined for repeated fields.
+			return zero
+		}
+		return fd.Default()
+	}
+	switch fd.Kind() {
+	case pref.BoolKind:
+		if t.Kind() == reflect.Bool {
+			return &boolConverter{t, defVal(fd, boolZero)}
+		}
+	case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
+		if t.Kind() == reflect.Int32 {
+			return &int32Converter{t, defVal(fd, int32Zero)}
+		}
+	case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+		if t.Kind() == reflect.Int64 {
+			return &int64Converter{t, defVal(fd, int64Zero)}
+		}
+	case pref.Uint32Kind, pref.Fixed32Kind:
+		if t.Kind() == reflect.Uint32 {
+			return &uint32Converter{t, defVal(fd, uint32Zero)}
+		}
+	case pref.Uint64Kind, pref.Fixed64Kind:
+		if t.Kind() == reflect.Uint64 {
+			return &uint64Converter{t, defVal(fd, uint64Zero)}
+		}
+	case pref.FloatKind:
+		if t.Kind() == reflect.Float32 {
+			return &float32Converter{t, defVal(fd, float32Zero)}
+		}
+	case pref.DoubleKind:
+		if t.Kind() == reflect.Float64 {
+			return &float64Converter{t, defVal(fd, float64Zero)}
+		}
+	case pref.StringKind:
+		if t.Kind() == reflect.String || (t.Kind() == reflect.Slice && t.Elem() == byteType) {
+			return &stringConverter{t, defVal(fd, stringZero)}
+		}
+	case pref.BytesKind:
+		if t.Kind() == reflect.String || (t.Kind() == reflect.Slice && t.Elem() == byteType) {
+			return &bytesConverter{t, defVal(fd, bytesZero)}
+		}
+	case pref.EnumKind:
+		// Handle enums, which must be a named int32 type.
+		if t.Kind() == reflect.Int32 {
+			return newEnumConverter(t, fd)
+		}
+	case pref.MessageKind, pref.GroupKind:
+		return newMessageConverter(t)
+	}
+	panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
+}
+
+type boolConverter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *boolConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfBool(v.Bool())
+}
+func (c *boolConverter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(v.Bool()).Convert(c.goType)
+}
+func (c *boolConverter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(bool)
+	return ok
+}
+func (c *boolConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *boolConverter) New() pref.Value  { return c.def }
+func (c *boolConverter) Zero() pref.Value { return c.def }
+
+type int32Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *int32Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfInt32(int32(v.Int()))
+}
+func (c *int32Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(int32(v.Int())).Convert(c.goType)
+}
+func (c *int32Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(int32)
+	return ok
+}
+func (c *int32Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *int32Converter) New() pref.Value  { return c.def }
+func (c *int32Converter) Zero() pref.Value { return c.def }
+
+type int64Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *int64Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfInt64(int64(v.Int()))
+}
+func (c *int64Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(int64(v.Int())).Convert(c.goType)
+}
+func (c *int64Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(int64)
+	return ok
+}
+func (c *int64Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *int64Converter) New() pref.Value  { return c.def }
+func (c *int64Converter) Zero() pref.Value { return c.def }
+
+type uint32Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *uint32Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfUint32(uint32(v.Uint()))
+}
+func (c *uint32Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(uint32(v.Uint())).Convert(c.goType)
+}
+func (c *uint32Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(uint32)
+	return ok
+}
+func (c *uint32Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *uint32Converter) New() pref.Value  { return c.def }
+func (c *uint32Converter) Zero() pref.Value { return c.def }
+
+type uint64Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *uint64Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfUint64(uint64(v.Uint()))
+}
+func (c *uint64Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(uint64(v.Uint())).Convert(c.goType)
+}
+func (c *uint64Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(uint64)
+	return ok
+}
+func (c *uint64Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *uint64Converter) New() pref.Value  { return c.def }
+func (c *uint64Converter) Zero() pref.Value { return c.def }
+
+type float32Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *float32Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfFloat32(float32(v.Float()))
+}
+func (c *float32Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(float32(v.Float())).Convert(c.goType)
+}
+func (c *float32Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(float32)
+	return ok
+}
+func (c *float32Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *float32Converter) New() pref.Value  { return c.def }
+func (c *float32Converter) Zero() pref.Value { return c.def }
+
+type float64Converter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *float64Converter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfFloat64(float64(v.Float()))
+}
+func (c *float64Converter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(float64(v.Float())).Convert(c.goType)
+}
+func (c *float64Converter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(float64)
+	return ok
+}
+func (c *float64Converter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *float64Converter) New() pref.Value  { return c.def }
+func (c *float64Converter) Zero() pref.Value { return c.def }
+
+type stringConverter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *stringConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfString(v.Convert(stringType).String())
+}
+func (c *stringConverter) GoValueOf(v pref.Value) reflect.Value {
+	// pref.Value.String never panics, so we go through an interface
+	// conversion here to check the type.
+	s := v.Interface().(string)
+	if c.goType.Kind() == reflect.Slice && s == "" {
+		return reflect.Zero(c.goType) // ensure empty string is []byte(nil)
+	}
+	return reflect.ValueOf(s).Convert(c.goType)
+}
+func (c *stringConverter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(string)
+	return ok
+}
+func (c *stringConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *stringConverter) New() pref.Value  { return c.def }
+func (c *stringConverter) Zero() pref.Value { return c.def }
+
+type bytesConverter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func (c *bytesConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	if c.goType.Kind() == reflect.String && v.Len() == 0 {
+		return pref.ValueOfBytes(nil) // ensure empty string is []byte(nil)
+	}
+	return pref.ValueOfBytes(v.Convert(bytesType).Bytes())
+}
+func (c *bytesConverter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(v.Bytes()).Convert(c.goType)
+}
+func (c *bytesConverter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().([]byte)
+	return ok
+}
+func (c *bytesConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+func (c *bytesConverter) New() pref.Value  { return c.def }
+func (c *bytesConverter) Zero() pref.Value { return c.def }
+
+type enumConverter struct {
+	goType reflect.Type
+	def    pref.Value
+}
+
+func newEnumConverter(goType reflect.Type, fd pref.FieldDescriptor) Converter {
+	var def pref.Value
+	if fd.Cardinality() == pref.Repeated {
+		def = pref.ValueOfEnum(fd.Enum().Values().Get(0).Number())
+	} else {
+		def = fd.Default()
+	}
+	return &enumConverter{goType, def}
+}
+
+func (c *enumConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfEnum(pref.EnumNumber(v.Int()))
+}
+
+func (c *enumConverter) GoValueOf(v pref.Value) reflect.Value {
+	return reflect.ValueOf(v.Enum()).Convert(c.goType)
+}
+
+func (c *enumConverter) IsValidPB(v pref.Value) bool {
+	_, ok := v.Interface().(pref.EnumNumber)
+	return ok
+}
+
+func (c *enumConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+
+func (c *enumConverter) New() pref.Value {
+	return c.def
+}
+
+func (c *enumConverter) Zero() pref.Value {
+	return c.def
+}
+
+type messageConverter struct {
+	goType reflect.Type
+}
+
+func newMessageConverter(goType reflect.Type) Converter {
+	return &messageConverter{goType}
+}
+
+func (c *messageConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	if m, ok := v.Interface().(pref.ProtoMessage); ok {
+		return pref.ValueOfMessage(m.ProtoReflect())
+	}
+	return pref.ValueOfMessage(legacyWrapMessage(v))
+}
+
+func (c *messageConverter) GoValueOf(v pref.Value) reflect.Value {
+	m := v.Message()
+	var rv reflect.Value
+	if u, ok := m.(unwrapper); ok {
+		rv = reflect.ValueOf(u.protoUnwrap())
+	} else {
+		rv = reflect.ValueOf(m.Interface())
+	}
+	if rv.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", rv.Type(), c.goType))
+	}
+	return rv
+}
+
+func (c *messageConverter) IsValidPB(v pref.Value) bool {
+	m := v.Message()
+	var rv reflect.Value
+	if u, ok := m.(unwrapper); ok {
+		rv = reflect.ValueOf(u.protoUnwrap())
+	} else {
+		rv = reflect.ValueOf(m.Interface())
+	}
+	return rv.Type() == c.goType
+}
+
+func (c *messageConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+
+func (c *messageConverter) New() pref.Value {
+	return c.PBValueOf(reflect.New(c.goType.Elem()))
+}
+
+func (c *messageConverter) Zero() pref.Value {
+	return c.PBValueOf(reflect.Zero(c.goType))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/convert_list.go b/vendor/google.golang.org/protobuf/internal/impl/convert_list.go
new file mode 100644
index 0000000..6fccab5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/convert_list.go
@@ -0,0 +1,141 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+func newListConverter(t reflect.Type, fd pref.FieldDescriptor) Converter {
+	switch {
+	case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Slice:
+		return &listPtrConverter{t, newSingularConverter(t.Elem().Elem(), fd)}
+	case t.Kind() == reflect.Slice:
+		return &listConverter{t, newSingularConverter(t.Elem(), fd)}
+	}
+	panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
+}
+
+type listConverter struct {
+	goType reflect.Type // []T
+	c      Converter
+}
+
+func (c *listConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	pv := reflect.New(c.goType)
+	pv.Elem().Set(v)
+	return pref.ValueOfList(&listReflect{pv, c.c})
+}
+
+func (c *listConverter) GoValueOf(v pref.Value) reflect.Value {
+	rv := v.List().(*listReflect).v
+	if rv.IsNil() {
+		return reflect.Zero(c.goType)
+	}
+	return rv.Elem()
+}
+
+func (c *listConverter) IsValidPB(v pref.Value) bool {
+	list, ok := v.Interface().(*listReflect)
+	if !ok {
+		return false
+	}
+	return list.v.Type().Elem() == c.goType
+}
+
+func (c *listConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+
+func (c *listConverter) New() pref.Value {
+	return pref.ValueOfList(&listReflect{reflect.New(c.goType), c.c})
+}
+
+func (c *listConverter) Zero() pref.Value {
+	return pref.ValueOfList(&listReflect{reflect.Zero(reflect.PtrTo(c.goType)), c.c})
+}
+
+type listPtrConverter struct {
+	goType reflect.Type // *[]T
+	c      Converter
+}
+
+func (c *listPtrConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfList(&listReflect{v, c.c})
+}
+
+func (c *listPtrConverter) GoValueOf(v pref.Value) reflect.Value {
+	return v.List().(*listReflect).v
+}
+
+func (c *listPtrConverter) IsValidPB(v pref.Value) bool {
+	list, ok := v.Interface().(*listReflect)
+	if !ok {
+		return false
+	}
+	return list.v.Type() == c.goType
+}
+
+func (c *listPtrConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+
+func (c *listPtrConverter) New() pref.Value {
+	return c.PBValueOf(reflect.New(c.goType.Elem()))
+}
+
+func (c *listPtrConverter) Zero() pref.Value {
+	return c.PBValueOf(reflect.Zero(c.goType))
+}
+
+type listReflect struct {
+	v    reflect.Value // *[]T
+	conv Converter
+}
+
+func (ls *listReflect) Len() int {
+	if ls.v.IsNil() {
+		return 0
+	}
+	return ls.v.Elem().Len()
+}
+func (ls *listReflect) Get(i int) pref.Value {
+	return ls.conv.PBValueOf(ls.v.Elem().Index(i))
+}
+func (ls *listReflect) Set(i int, v pref.Value) {
+	ls.v.Elem().Index(i).Set(ls.conv.GoValueOf(v))
+}
+func (ls *listReflect) Append(v pref.Value) {
+	ls.v.Elem().Set(reflect.Append(ls.v.Elem(), ls.conv.GoValueOf(v)))
+}
+func (ls *listReflect) AppendMutable() pref.Value {
+	if _, ok := ls.conv.(*messageConverter); !ok {
+		panic("invalid AppendMutable on list with non-message type")
+	}
+	v := ls.NewElement()
+	ls.Append(v)
+	return v
+}
+func (ls *listReflect) Truncate(i int) {
+	ls.v.Elem().Set(ls.v.Elem().Slice(0, i))
+}
+func (ls *listReflect) NewElement() pref.Value {
+	return ls.conv.New()
+}
+func (ls *listReflect) IsValid() bool {
+	return !ls.v.IsNil()
+}
+func (ls *listReflect) protoUnwrap() interface{} {
+	return ls.v.Interface()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/convert_map.go b/vendor/google.golang.org/protobuf/internal/impl/convert_map.go
new file mode 100644
index 0000000..de06b25
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/convert_map.go
@@ -0,0 +1,121 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type mapConverter struct {
+	goType           reflect.Type // map[K]V
+	keyConv, valConv Converter
+}
+
+func newMapConverter(t reflect.Type, fd pref.FieldDescriptor) *mapConverter {
+	if t.Kind() != reflect.Map {
+		panic(fmt.Sprintf("invalid Go type %v for field %v", t, fd.FullName()))
+	}
+	return &mapConverter{
+		goType:  t,
+		keyConv: newSingularConverter(t.Key(), fd.MapKey()),
+		valConv: newSingularConverter(t.Elem(), fd.MapValue()),
+	}
+}
+
+func (c *mapConverter) PBValueOf(v reflect.Value) pref.Value {
+	if v.Type() != c.goType {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", v.Type(), c.goType))
+	}
+	return pref.ValueOfMap(&mapReflect{v, c.keyConv, c.valConv})
+}
+
+func (c *mapConverter) GoValueOf(v pref.Value) reflect.Value {
+	return v.Map().(*mapReflect).v
+}
+
+func (c *mapConverter) IsValidPB(v pref.Value) bool {
+	mapv, ok := v.Interface().(*mapReflect)
+	if !ok {
+		return false
+	}
+	return mapv.v.Type() == c.goType
+}
+
+func (c *mapConverter) IsValidGo(v reflect.Value) bool {
+	return v.IsValid() && v.Type() == c.goType
+}
+
+func (c *mapConverter) New() pref.Value {
+	return c.PBValueOf(reflect.MakeMap(c.goType))
+}
+
+func (c *mapConverter) Zero() pref.Value {
+	return c.PBValueOf(reflect.Zero(c.goType))
+}
+
+type mapReflect struct {
+	v       reflect.Value // map[K]V
+	keyConv Converter
+	valConv Converter
+}
+
+func (ms *mapReflect) Len() int {
+	return ms.v.Len()
+}
+func (ms *mapReflect) Has(k pref.MapKey) bool {
+	rk := ms.keyConv.GoValueOf(k.Value())
+	rv := ms.v.MapIndex(rk)
+	return rv.IsValid()
+}
+func (ms *mapReflect) Get(k pref.MapKey) pref.Value {
+	rk := ms.keyConv.GoValueOf(k.Value())
+	rv := ms.v.MapIndex(rk)
+	if !rv.IsValid() {
+		return pref.Value{}
+	}
+	return ms.valConv.PBValueOf(rv)
+}
+func (ms *mapReflect) Set(k pref.MapKey, v pref.Value) {
+	rk := ms.keyConv.GoValueOf(k.Value())
+	rv := ms.valConv.GoValueOf(v)
+	ms.v.SetMapIndex(rk, rv)
+}
+func (ms *mapReflect) Clear(k pref.MapKey) {
+	rk := ms.keyConv.GoValueOf(k.Value())
+	ms.v.SetMapIndex(rk, reflect.Value{})
+}
+func (ms *mapReflect) Mutable(k pref.MapKey) pref.Value {
+	if _, ok := ms.valConv.(*messageConverter); !ok {
+		panic("invalid Mutable on map with non-message value type")
+	}
+	v := ms.Get(k)
+	if !v.IsValid() {
+		v = ms.NewValue()
+		ms.Set(k, v)
+	}
+	return v
+}
+func (ms *mapReflect) Range(f func(pref.MapKey, pref.Value) bool) {
+	iter := mapRange(ms.v)
+	for iter.Next() {
+		k := ms.keyConv.PBValueOf(iter.Key()).MapKey()
+		v := ms.valConv.PBValueOf(iter.Value())
+		if !f(k, v) {
+			return
+		}
+	}
+}
+func (ms *mapReflect) NewValue() pref.Value {
+	return ms.valConv.New()
+}
+func (ms *mapReflect) IsValid() bool {
+	return !ms.v.IsNil()
+}
+func (ms *mapReflect) protoUnwrap() interface{} {
+	return ms.v.Interface()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/decode.go b/vendor/google.golang.org/protobuf/internal/impl/decode.go
new file mode 100644
index 0000000..85ba1d3
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/decode.go
@@ -0,0 +1,274 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"math/bits"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+	"google.golang.org/protobuf/runtime/protoiface"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+type unmarshalOptions struct {
+	flags    protoiface.UnmarshalInputFlags
+	resolver interface {
+		FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
+		FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
+	}
+}
+
+func (o unmarshalOptions) Options() proto.UnmarshalOptions {
+	return proto.UnmarshalOptions{
+		Merge:          true,
+		AllowPartial:   true,
+		DiscardUnknown: o.DiscardUnknown(),
+		Resolver:       o.resolver,
+	}
+}
+
+func (o unmarshalOptions) DiscardUnknown() bool { return o.flags&piface.UnmarshalDiscardUnknown != 0 }
+
+func (o unmarshalOptions) IsDefault() bool {
+	return o.flags == 0 && o.resolver == preg.GlobalTypes
+}
+
+var lazyUnmarshalOptions = unmarshalOptions{
+	resolver: preg.GlobalTypes,
+}
+
+type unmarshalOutput struct {
+	n           int // number of bytes consumed
+	initialized bool
+}
+
+// unmarshal is protoreflect.Methods.Unmarshal.
+func (mi *MessageInfo) unmarshal(in piface.UnmarshalInput) (piface.UnmarshalOutput, error) {
+	var p pointer
+	if ms, ok := in.Message.(*messageState); ok {
+		p = ms.pointer()
+	} else {
+		p = in.Message.(*messageReflectWrapper).pointer()
+	}
+	out, err := mi.unmarshalPointer(in.Buf, p, 0, unmarshalOptions{
+		flags:    in.Flags,
+		resolver: in.Resolver,
+	})
+	var flags piface.UnmarshalOutputFlags
+	if out.initialized {
+		flags |= piface.UnmarshalInitialized
+	}
+	return piface.UnmarshalOutput{
+		Flags: flags,
+	}, err
+}
+
+// errUnknown is returned during unmarshaling to indicate a parse error that
+// should result in a field being placed in the unknown fields section (for example,
+// when the wire type doesn't match) as opposed to the entire unmarshal operation
+// failing (for example, when a field extends past the available input).
+//
+// This is a sentinel error which should never be visible to the user.
+var errUnknown = errors.New("unknown")
+
+func (mi *MessageInfo) unmarshalPointer(b []byte, p pointer, groupTag protowire.Number, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	mi.init()
+	if flags.ProtoLegacy && mi.isMessageSet {
+		return unmarshalMessageSet(mi, b, p, opts)
+	}
+	initialized := true
+	var requiredMask uint64
+	var exts *map[int32]ExtensionField
+	start := len(b)
+	for len(b) > 0 {
+		// Parse the tag (field number and wire type).
+		var tag uint64
+		if b[0] < 0x80 {
+			tag = uint64(b[0])
+			b = b[1:]
+		} else if len(b) >= 2 && b[1] < 128 {
+			tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
+			b = b[2:]
+		} else {
+			var n int
+			tag, n = protowire.ConsumeVarint(b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			b = b[n:]
+		}
+		var num protowire.Number
+		if n := tag >> 3; n < uint64(protowire.MinValidNumber) || n > uint64(protowire.MaxValidNumber) {
+			return out, errors.New("invalid field number")
+		} else {
+			num = protowire.Number(n)
+		}
+		wtyp := protowire.Type(tag & 7)
+
+		if wtyp == protowire.EndGroupType {
+			if num != groupTag {
+				return out, errors.New("mismatching end group marker")
+			}
+			groupTag = 0
+			break
+		}
+
+		var f *coderFieldInfo
+		if int(num) < len(mi.denseCoderFields) {
+			f = mi.denseCoderFields[num]
+		} else {
+			f = mi.coderFields[num]
+		}
+		var n int
+		err := errUnknown
+		switch {
+		case f != nil:
+			if f.funcs.unmarshal == nil {
+				break
+			}
+			var o unmarshalOutput
+			o, err = f.funcs.unmarshal(b, p.Apply(f.offset), wtyp, f, opts)
+			n = o.n
+			if err != nil {
+				break
+			}
+			requiredMask |= f.validation.requiredBit
+			if f.funcs.isInit != nil && !o.initialized {
+				initialized = false
+			}
+		default:
+			// Possible extension.
+			if exts == nil && mi.extensionOffset.IsValid() {
+				exts = p.Apply(mi.extensionOffset).Extensions()
+				if *exts == nil {
+					*exts = make(map[int32]ExtensionField)
+				}
+			}
+			if exts == nil {
+				break
+			}
+			var o unmarshalOutput
+			o, err = mi.unmarshalExtension(b, num, wtyp, *exts, opts)
+			if err != nil {
+				break
+			}
+			n = o.n
+			if !o.initialized {
+				initialized = false
+			}
+		}
+		if err != nil {
+			if err != errUnknown {
+				return out, err
+			}
+			n = protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return out, protowire.ParseError(n)
+			}
+			if !opts.DiscardUnknown() && mi.unknownOffset.IsValid() {
+				u := p.Apply(mi.unknownOffset).Bytes()
+				*u = protowire.AppendTag(*u, num, wtyp)
+				*u = append(*u, b[:n]...)
+			}
+		}
+		b = b[n:]
+	}
+	if groupTag != 0 {
+		return out, errors.New("missing end group marker")
+	}
+	if mi.numRequiredFields > 0 && bits.OnesCount64(requiredMask) != int(mi.numRequiredFields) {
+		initialized = false
+	}
+	if initialized {
+		out.initialized = true
+	}
+	out.n = start - len(b)
+	return out, nil
+}
+
+func (mi *MessageInfo) unmarshalExtension(b []byte, num protowire.Number, wtyp protowire.Type, exts map[int32]ExtensionField, opts unmarshalOptions) (out unmarshalOutput, err error) {
+	x := exts[int32(num)]
+	xt := x.Type()
+	if xt == nil {
+		var err error
+		xt, err = opts.resolver.FindExtensionByNumber(mi.Desc.FullName(), num)
+		if err != nil {
+			if err == preg.NotFound {
+				return out, errUnknown
+			}
+			return out, errors.New("%v: unable to resolve extension %v: %v", mi.Desc.FullName(), num, err)
+		}
+	}
+	xi := getExtensionFieldInfo(xt)
+	if xi.funcs.unmarshal == nil {
+		return out, errUnknown
+	}
+	if flags.LazyUnmarshalExtensions {
+		if opts.IsDefault() && x.canLazy(xt) {
+			out, valid := skipExtension(b, xi, num, wtyp, opts)
+			switch valid {
+			case ValidationValid:
+				if out.initialized {
+					x.appendLazyBytes(xt, xi, num, wtyp, b[:out.n])
+					exts[int32(num)] = x
+					return out, nil
+				}
+			case ValidationInvalid:
+				return out, errors.New("invalid wire format")
+			case ValidationUnknown:
+			}
+		}
+	}
+	ival := x.Value()
+	if !ival.IsValid() && xi.unmarshalNeedsValue {
+		// Create a new message, list, or map value to fill in.
+		// For enums, create a prototype value to let the unmarshal func know the
+		// concrete type.
+		ival = xt.New()
+	}
+	v, out, err := xi.funcs.unmarshal(b, ival, num, wtyp, opts)
+	if err != nil {
+		return out, err
+	}
+	if xi.funcs.isInit == nil {
+		out.initialized = true
+	}
+	x.Set(xt, v)
+	exts[int32(num)] = x
+	return out, nil
+}
+
+func skipExtension(b []byte, xi *extensionFieldInfo, num protowire.Number, wtyp protowire.Type, opts unmarshalOptions) (out unmarshalOutput, _ ValidationStatus) {
+	if xi.validation.mi == nil {
+		return out, ValidationUnknown
+	}
+	xi.validation.mi.init()
+	switch xi.validation.typ {
+	case validationTypeMessage:
+		if wtyp != protowire.BytesType {
+			return out, ValidationUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return out, ValidationUnknown
+		}
+		out, st := xi.validation.mi.validate(v, 0, opts)
+		out.n = n
+		return out, st
+	case validationTypeGroup:
+		if wtyp != protowire.StartGroupType {
+			return out, ValidationUnknown
+		}
+		out, st := xi.validation.mi.validate(b, num, opts)
+		return out, st
+	default:
+		return out, ValidationUnknown
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/encode.go b/vendor/google.golang.org/protobuf/internal/impl/encode.go
new file mode 100644
index 0000000..8c8a794
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/encode.go
@@ -0,0 +1,199 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"math"
+	"sort"
+	"sync/atomic"
+
+	"google.golang.org/protobuf/internal/flags"
+	proto "google.golang.org/protobuf/proto"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+type marshalOptions struct {
+	flags piface.MarshalInputFlags
+}
+
+func (o marshalOptions) Options() proto.MarshalOptions {
+	return proto.MarshalOptions{
+		AllowPartial:  true,
+		Deterministic: o.Deterministic(),
+		UseCachedSize: o.UseCachedSize(),
+	}
+}
+
+func (o marshalOptions) Deterministic() bool { return o.flags&piface.MarshalDeterministic != 0 }
+func (o marshalOptions) UseCachedSize() bool { return o.flags&piface.MarshalUseCachedSize != 0 }
+
+// size is protoreflect.Methods.Size.
+func (mi *MessageInfo) size(in piface.SizeInput) piface.SizeOutput {
+	var p pointer
+	if ms, ok := in.Message.(*messageState); ok {
+		p = ms.pointer()
+	} else {
+		p = in.Message.(*messageReflectWrapper).pointer()
+	}
+	size := mi.sizePointer(p, marshalOptions{
+		flags: in.Flags,
+	})
+	return piface.SizeOutput{Size: size}
+}
+
+func (mi *MessageInfo) sizePointer(p pointer, opts marshalOptions) (size int) {
+	mi.init()
+	if p.IsNil() {
+		return 0
+	}
+	if opts.UseCachedSize() && mi.sizecacheOffset.IsValid() {
+		if size := atomic.LoadInt32(p.Apply(mi.sizecacheOffset).Int32()); size >= 0 {
+			return int(size)
+		}
+	}
+	return mi.sizePointerSlow(p, opts)
+}
+
+func (mi *MessageInfo) sizePointerSlow(p pointer, opts marshalOptions) (size int) {
+	if flags.ProtoLegacy && mi.isMessageSet {
+		size = sizeMessageSet(mi, p, opts)
+		if mi.sizecacheOffset.IsValid() {
+			atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), int32(size))
+		}
+		return size
+	}
+	if mi.extensionOffset.IsValid() {
+		e := p.Apply(mi.extensionOffset).Extensions()
+		size += mi.sizeExtensions(e, opts)
+	}
+	for _, f := range mi.orderedCoderFields {
+		if f.funcs.size == nil {
+			continue
+		}
+		fptr := p.Apply(f.offset)
+		if f.isPointer && fptr.Elem().IsNil() {
+			continue
+		}
+		size += f.funcs.size(fptr, f, opts)
+	}
+	if mi.unknownOffset.IsValid() {
+		u := *p.Apply(mi.unknownOffset).Bytes()
+		size += len(u)
+	}
+	if mi.sizecacheOffset.IsValid() {
+		if size > math.MaxInt32 {
+			// The size is too large for the int32 sizecache field.
+			// We will need to recompute the size when encoding;
+			// unfortunately expensive, but better than invalid output.
+			atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), -1)
+		} else {
+			atomic.StoreInt32(p.Apply(mi.sizecacheOffset).Int32(), int32(size))
+		}
+	}
+	return size
+}
+
+// marshal is protoreflect.Methods.Marshal.
+func (mi *MessageInfo) marshal(in piface.MarshalInput) (out piface.MarshalOutput, err error) {
+	var p pointer
+	if ms, ok := in.Message.(*messageState); ok {
+		p = ms.pointer()
+	} else {
+		p = in.Message.(*messageReflectWrapper).pointer()
+	}
+	b, err := mi.marshalAppendPointer(in.Buf, p, marshalOptions{
+		flags: in.Flags,
+	})
+	return piface.MarshalOutput{Buf: b}, err
+}
+
+func (mi *MessageInfo) marshalAppendPointer(b []byte, p pointer, opts marshalOptions) ([]byte, error) {
+	mi.init()
+	if p.IsNil() {
+		return b, nil
+	}
+	if flags.ProtoLegacy && mi.isMessageSet {
+		return marshalMessageSet(mi, b, p, opts)
+	}
+	var err error
+	// The old marshaler encodes extensions at beginning.
+	if mi.extensionOffset.IsValid() {
+		e := p.Apply(mi.extensionOffset).Extensions()
+		// TODO: Special handling for MessageSet?
+		b, err = mi.appendExtensions(b, e, opts)
+		if err != nil {
+			return b, err
+		}
+	}
+	for _, f := range mi.orderedCoderFields {
+		if f.funcs.marshal == nil {
+			continue
+		}
+		fptr := p.Apply(f.offset)
+		if f.isPointer && fptr.Elem().IsNil() {
+			continue
+		}
+		b, err = f.funcs.marshal(b, fptr, f, opts)
+		if err != nil {
+			return b, err
+		}
+	}
+	if mi.unknownOffset.IsValid() && !mi.isMessageSet {
+		u := *p.Apply(mi.unknownOffset).Bytes()
+		b = append(b, u...)
+	}
+	return b, nil
+}
+
+func (mi *MessageInfo) sizeExtensions(ext *map[int32]ExtensionField, opts marshalOptions) (n int) {
+	if ext == nil {
+		return 0
+	}
+	for _, x := range *ext {
+		xi := getExtensionFieldInfo(x.Type())
+		if xi.funcs.size == nil {
+			continue
+		}
+		n += xi.funcs.size(x.Value(), xi.tagsize, opts)
+	}
+	return n
+}
+
+func (mi *MessageInfo) appendExtensions(b []byte, ext *map[int32]ExtensionField, opts marshalOptions) ([]byte, error) {
+	if ext == nil {
+		return b, nil
+	}
+
+	switch len(*ext) {
+	case 0:
+		return b, nil
+	case 1:
+		// Fast-path for one extension: Don't bother sorting the keys.
+		var err error
+		for _, x := range *ext {
+			xi := getExtensionFieldInfo(x.Type())
+			b, err = xi.funcs.marshal(b, x.Value(), xi.wiretag, opts)
+		}
+		return b, err
+	default:
+		// Sort the keys to provide a deterministic encoding.
+		// Not sure this is required, but the old code does it.
+		keys := make([]int, 0, len(*ext))
+		for k := range *ext {
+			keys = append(keys, int(k))
+		}
+		sort.Ints(keys)
+		var err error
+		for _, k := range keys {
+			x := (*ext)[int32(k)]
+			xi := getExtensionFieldInfo(x.Type())
+			b, err = xi.funcs.marshal(b, x.Value(), xi.wiretag, opts)
+			if err != nil {
+				return b, err
+			}
+		}
+		return b, nil
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/enum.go b/vendor/google.golang.org/protobuf/internal/impl/enum.go
new file mode 100644
index 0000000..8c1eab4
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/enum.go
@@ -0,0 +1,21 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"reflect"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type EnumInfo struct {
+	GoReflectType reflect.Type // int32 kind
+	Desc          pref.EnumDescriptor
+}
+
+func (t *EnumInfo) New(n pref.EnumNumber) pref.Enum {
+	return reflect.ValueOf(n).Convert(t.GoReflectType).Interface().(pref.Enum)
+}
+func (t *EnumInfo) Descriptor() pref.EnumDescriptor { return t.Desc }
diff --git a/vendor/google.golang.org/protobuf/internal/impl/extension.go b/vendor/google.golang.org/protobuf/internal/impl/extension.go
new file mode 100644
index 0000000..e904fd9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/extension.go
@@ -0,0 +1,156 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"reflect"
+	"sync"
+	"sync/atomic"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// ExtensionInfo implements ExtensionType.
+//
+// This type contains a number of exported fields for legacy compatibility.
+// The only non-deprecated use of this type is through the methods of the
+// ExtensionType interface.
+type ExtensionInfo struct {
+	// An ExtensionInfo may exist in several stages of initialization.
+	//
+	// extensionInfoUninitialized: Some or all of the legacy exported
+	// fields may be set, but none of the unexported fields have been
+	// initialized. This is the starting state for an ExtensionInfo
+	// in legacy generated code.
+	//
+	// extensionInfoDescInit: The desc field is set, but other unexported fields
+	// may not be initialized. Legacy exported fields may or may not be set.
+	// This is the starting state for an ExtensionInfo in newly generated code.
+	//
+	// extensionInfoFullInit: The ExtensionInfo is fully initialized.
+	// This state is only entered after lazy initialization is complete.
+	init uint32
+	mu   sync.Mutex
+
+	goType reflect.Type
+	desc   extensionTypeDescriptor
+	conv   Converter
+	info   *extensionFieldInfo // for fast-path method implementations
+
+	// ExtendedType is a typed nil-pointer to the parent message type that
+	// is being extended. It is possible for this to be unpopulated in v2
+	// since the message may no longer implement the MessageV1 interface.
+	//
+	// Deprecated: Use the ExtendedType method instead.
+	ExtendedType piface.MessageV1
+
+	// ExtensionType is the zero value of the extension type.
+	//
+	// For historical reasons, reflect.TypeOf(ExtensionType) and the
+	// type returned by InterfaceOf may not be identical.
+	//
+	// Deprecated: Use InterfaceOf(xt.Zero()) instead.
+	ExtensionType interface{}
+
+	// Field is the field number of the extension.
+	//
+	// Deprecated: Use the Descriptor().Number method instead.
+	Field int32
+
+	// Name is the fully qualified name of extension.
+	//
+	// Deprecated: Use the Descriptor().FullName method instead.
+	Name string
+
+	// Tag is the protobuf struct tag used in the v1 API.
+	//
+	// Deprecated: Do not use.
+	Tag string
+
+	// Filename is the proto filename in which the extension is defined.
+	//
+	// Deprecated: Use Descriptor().ParentFile().Path() instead.
+	Filename string
+}
+
+// Stages of initialization: See the ExtensionInfo.init field.
+const (
+	extensionInfoUninitialized = 0
+	extensionInfoDescInit      = 1
+	extensionInfoFullInit      = 2
+)
+
+func InitExtensionInfo(xi *ExtensionInfo, xd pref.ExtensionDescriptor, goType reflect.Type) {
+	xi.goType = goType
+	xi.desc = extensionTypeDescriptor{xd, xi}
+	xi.init = extensionInfoDescInit
+}
+
+func (xi *ExtensionInfo) New() pref.Value {
+	return xi.lazyInit().New()
+}
+func (xi *ExtensionInfo) Zero() pref.Value {
+	return xi.lazyInit().Zero()
+}
+func (xi *ExtensionInfo) ValueOf(v interface{}) pref.Value {
+	return xi.lazyInit().PBValueOf(reflect.ValueOf(v))
+}
+func (xi *ExtensionInfo) InterfaceOf(v pref.Value) interface{} {
+	return xi.lazyInit().GoValueOf(v).Interface()
+}
+func (xi *ExtensionInfo) IsValidValue(v pref.Value) bool {
+	return xi.lazyInit().IsValidPB(v)
+}
+func (xi *ExtensionInfo) IsValidInterface(v interface{}) bool {
+	return xi.lazyInit().IsValidGo(reflect.ValueOf(v))
+}
+func (xi *ExtensionInfo) TypeDescriptor() pref.ExtensionTypeDescriptor {
+	if atomic.LoadUint32(&xi.init) < extensionInfoDescInit {
+		xi.lazyInitSlow()
+	}
+	return &xi.desc
+}
+
+func (xi *ExtensionInfo) lazyInit() Converter {
+	if atomic.LoadUint32(&xi.init) < extensionInfoFullInit {
+		xi.lazyInitSlow()
+	}
+	return xi.conv
+}
+
+func (xi *ExtensionInfo) lazyInitSlow() {
+	xi.mu.Lock()
+	defer xi.mu.Unlock()
+
+	if xi.init == extensionInfoFullInit {
+		return
+	}
+	defer atomic.StoreUint32(&xi.init, extensionInfoFullInit)
+
+	if xi.desc.ExtensionDescriptor == nil {
+		xi.initFromLegacy()
+	}
+	if !xi.desc.ExtensionDescriptor.IsPlaceholder() {
+		if xi.ExtensionType == nil {
+			xi.initToLegacy()
+		}
+		xi.conv = NewConverter(xi.goType, xi.desc.ExtensionDescriptor)
+		xi.info = makeExtensionFieldInfo(xi.desc.ExtensionDescriptor)
+		xi.info.validation = newValidationInfo(xi.desc.ExtensionDescriptor, xi.goType)
+	}
+}
+
+type extensionTypeDescriptor struct {
+	pref.ExtensionDescriptor
+	xi *ExtensionInfo
+}
+
+func (xtd *extensionTypeDescriptor) Type() pref.ExtensionType {
+	return xtd.xi
+}
+func (xtd *extensionTypeDescriptor) Descriptor() pref.ExtensionDescriptor {
+	return xtd.ExtensionDescriptor
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/legacy_enum.go b/vendor/google.golang.org/protobuf/internal/impl/legacy_enum.go
new file mode 100644
index 0000000..f7d7ffb
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/legacy_enum.go
@@ -0,0 +1,219 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"sync"
+
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// legacyEnumName returns the name of enums used in legacy code.
+// It is neither the protobuf full name nor the qualified Go name,
+// but rather an odd hybrid of both.
+func legacyEnumName(ed pref.EnumDescriptor) string {
+	var protoPkg string
+	enumName := string(ed.FullName())
+	if fd := ed.ParentFile(); fd != nil {
+		protoPkg = string(fd.Package())
+		enumName = strings.TrimPrefix(enumName, protoPkg+".")
+	}
+	if protoPkg == "" {
+		return strs.GoCamelCase(enumName)
+	}
+	return protoPkg + "." + strs.GoCamelCase(enumName)
+}
+
+// legacyWrapEnum wraps v as a protoreflect.Enum,
+// where v must be a int32 kind and not implement the v2 API already.
+func legacyWrapEnum(v reflect.Value) pref.Enum {
+	et := legacyLoadEnumType(v.Type())
+	return et.New(pref.EnumNumber(v.Int()))
+}
+
+var legacyEnumTypeCache sync.Map // map[reflect.Type]protoreflect.EnumType
+
+// legacyLoadEnumType dynamically loads a protoreflect.EnumType for t,
+// where t must be an int32 kind and not implement the v2 API already.
+func legacyLoadEnumType(t reflect.Type) pref.EnumType {
+	// Fast-path: check if a EnumType is cached for this concrete type.
+	if et, ok := legacyEnumTypeCache.Load(t); ok {
+		return et.(pref.EnumType)
+	}
+
+	// Slow-path: derive enum descriptor and initialize EnumType.
+	var et pref.EnumType
+	ed := LegacyLoadEnumDesc(t)
+	et = &legacyEnumType{
+		desc:   ed,
+		goType: t,
+	}
+	if et, ok := legacyEnumTypeCache.LoadOrStore(t, et); ok {
+		return et.(pref.EnumType)
+	}
+	return et
+}
+
+type legacyEnumType struct {
+	desc   pref.EnumDescriptor
+	goType reflect.Type
+	m      sync.Map // map[protoreflect.EnumNumber]proto.Enum
+}
+
+func (t *legacyEnumType) New(n pref.EnumNumber) pref.Enum {
+	if e, ok := t.m.Load(n); ok {
+		return e.(pref.Enum)
+	}
+	e := &legacyEnumWrapper{num: n, pbTyp: t, goTyp: t.goType}
+	t.m.Store(n, e)
+	return e
+}
+func (t *legacyEnumType) Descriptor() pref.EnumDescriptor {
+	return t.desc
+}
+
+type legacyEnumWrapper struct {
+	num   pref.EnumNumber
+	pbTyp pref.EnumType
+	goTyp reflect.Type
+}
+
+func (e *legacyEnumWrapper) Descriptor() pref.EnumDescriptor {
+	return e.pbTyp.Descriptor()
+}
+func (e *legacyEnumWrapper) Type() pref.EnumType {
+	return e.pbTyp
+}
+func (e *legacyEnumWrapper) Number() pref.EnumNumber {
+	return e.num
+}
+func (e *legacyEnumWrapper) ProtoReflect() pref.Enum {
+	return e
+}
+func (e *legacyEnumWrapper) protoUnwrap() interface{} {
+	v := reflect.New(e.goTyp).Elem()
+	v.SetInt(int64(e.num))
+	return v.Interface()
+}
+
+var (
+	_ pref.Enum = (*legacyEnumWrapper)(nil)
+	_ unwrapper = (*legacyEnumWrapper)(nil)
+)
+
+var legacyEnumDescCache sync.Map // map[reflect.Type]protoreflect.EnumDescriptor
+
+// LegacyLoadEnumDesc returns an EnumDescriptor derived from the Go type,
+// which must be an int32 kind and not implement the v2 API already.
+//
+// This is exported for testing purposes.
+func LegacyLoadEnumDesc(t reflect.Type) pref.EnumDescriptor {
+	// Fast-path: check if an EnumDescriptor is cached for this concrete type.
+	if ed, ok := legacyEnumDescCache.Load(t); ok {
+		return ed.(pref.EnumDescriptor)
+	}
+
+	// Slow-path: initialize EnumDescriptor from the raw descriptor.
+	ev := reflect.Zero(t).Interface()
+	if _, ok := ev.(pref.Enum); ok {
+		panic(fmt.Sprintf("%v already implements proto.Enum", t))
+	}
+	edV1, ok := ev.(enumV1)
+	if !ok {
+		return aberrantLoadEnumDesc(t)
+	}
+	b, idxs := edV1.EnumDescriptor()
+
+	var ed pref.EnumDescriptor
+	if len(idxs) == 1 {
+		ed = legacyLoadFileDesc(b).Enums().Get(idxs[0])
+	} else {
+		md := legacyLoadFileDesc(b).Messages().Get(idxs[0])
+		for _, i := range idxs[1 : len(idxs)-1] {
+			md = md.Messages().Get(i)
+		}
+		ed = md.Enums().Get(idxs[len(idxs)-1])
+	}
+	if ed, ok := legacyEnumDescCache.LoadOrStore(t, ed); ok {
+		return ed.(protoreflect.EnumDescriptor)
+	}
+	return ed
+}
+
+var aberrantEnumDescCache sync.Map // map[reflect.Type]protoreflect.EnumDescriptor
+
+// aberrantLoadEnumDesc returns an EnumDescriptor derived from the Go type,
+// which must not implement protoreflect.Enum or enumV1.
+//
+// If the type does not implement enumV1, then there is no reliable
+// way to derive the original protobuf type information.
+// We are unable to use the global enum registry since it is
+// unfortunately keyed by the protobuf full name, which we also do not know.
+// Thus, this produces some bogus enum descriptor based on the Go type name.
+func aberrantLoadEnumDesc(t reflect.Type) pref.EnumDescriptor {
+	// Fast-path: check if an EnumDescriptor is cached for this concrete type.
+	if ed, ok := aberrantEnumDescCache.Load(t); ok {
+		return ed.(pref.EnumDescriptor)
+	}
+
+	// Slow-path: construct a bogus, but unique EnumDescriptor.
+	ed := &filedesc.Enum{L2: new(filedesc.EnumL2)}
+	ed.L0.FullName = AberrantDeriveFullName(t) // e.g., github_com.user.repo.MyEnum
+	ed.L0.ParentFile = filedesc.SurrogateProto3
+	ed.L2.Values.List = append(ed.L2.Values.List, filedesc.EnumValue{})
+
+	// TODO: Use the presence of a UnmarshalJSON method to determine proto2?
+
+	vd := &ed.L2.Values.List[0]
+	vd.L0.FullName = ed.L0.FullName + "_UNKNOWN" // e.g., github_com.user.repo.MyEnum_UNKNOWN
+	vd.L0.ParentFile = ed.L0.ParentFile
+	vd.L0.Parent = ed
+
+	// TODO: We could use the String method to obtain some enum value names by
+	// starting at 0 and print the enum until it produces invalid identifiers.
+	// An exhaustive query is clearly impractical, but can be best-effort.
+
+	if ed, ok := aberrantEnumDescCache.LoadOrStore(t, ed); ok {
+		return ed.(pref.EnumDescriptor)
+	}
+	return ed
+}
+
+// AberrantDeriveFullName derives a fully qualified protobuf name for the given Go type
+// The provided name is not guaranteed to be stable nor universally unique.
+// It should be sufficiently unique within a program.
+//
+// This is exported for testing purposes.
+func AberrantDeriveFullName(t reflect.Type) pref.FullName {
+	sanitize := func(r rune) rune {
+		switch {
+		case r == '/':
+			return '.'
+		case 'a' <= r && r <= 'z', 'A' <= r && r <= 'Z', '0' <= r && r <= '9':
+			return r
+		default:
+			return '_'
+		}
+	}
+	prefix := strings.Map(sanitize, t.PkgPath())
+	suffix := strings.Map(sanitize, t.Name())
+	if suffix == "" {
+		suffix = fmt.Sprintf("UnknownX%X", reflect.ValueOf(t).Pointer())
+	}
+
+	ss := append(strings.Split(prefix, "."), suffix)
+	for i, s := range ss {
+		if s == "" || ('0' <= s[0] && s[0] <= '9') {
+			ss[i] = "x" + s
+		}
+	}
+	return pref.FullName(strings.Join(ss, "."))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/legacy_export.go b/vendor/google.golang.org/protobuf/internal/impl/legacy_export.go
new file mode 100644
index 0000000..c3d741c
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/legacy_export.go
@@ -0,0 +1,92 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"encoding/binary"
+	"encoding/json"
+	"hash/crc32"
+	"math"
+	"reflect"
+
+	"google.golang.org/protobuf/internal/errors"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// These functions exist to support exported APIs in generated protobufs.
+// While these are deprecated, they cannot be removed for compatibility reasons.
+
+// LegacyEnumName returns the name of enums used in legacy code.
+func (Export) LegacyEnumName(ed pref.EnumDescriptor) string {
+	return legacyEnumName(ed)
+}
+
+// LegacyMessageTypeOf returns the protoreflect.MessageType for m,
+// with name used as the message name if necessary.
+func (Export) LegacyMessageTypeOf(m piface.MessageV1, name pref.FullName) pref.MessageType {
+	if mv := (Export{}).protoMessageV2Of(m); mv != nil {
+		return mv.ProtoReflect().Type()
+	}
+	return legacyLoadMessageInfo(reflect.TypeOf(m), name)
+}
+
+// UnmarshalJSONEnum unmarshals an enum from a JSON-encoded input.
+// The input can either be a string representing the enum value by name,
+// or a number representing the enum number itself.
+func (Export) UnmarshalJSONEnum(ed pref.EnumDescriptor, b []byte) (pref.EnumNumber, error) {
+	if b[0] == '"' {
+		var name pref.Name
+		if err := json.Unmarshal(b, &name); err != nil {
+			return 0, errors.New("invalid input for enum %v: %s", ed.FullName(), b)
+		}
+		ev := ed.Values().ByName(name)
+		if ev == nil {
+			return 0, errors.New("invalid value for enum %v: %s", ed.FullName(), name)
+		}
+		return ev.Number(), nil
+	} else {
+		var num pref.EnumNumber
+		if err := json.Unmarshal(b, &num); err != nil {
+			return 0, errors.New("invalid input for enum %v: %s", ed.FullName(), b)
+		}
+		return num, nil
+	}
+}
+
+// CompressGZIP compresses the input as a GZIP-encoded file.
+// The current implementation does no compression.
+func (Export) CompressGZIP(in []byte) (out []byte) {
+	// RFC 1952, section 2.3.1.
+	var gzipHeader = [10]byte{0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff}
+
+	// RFC 1951, section 3.2.4.
+	var blockHeader [5]byte
+	const maxBlockSize = math.MaxUint16
+	numBlocks := 1 + len(in)/maxBlockSize
+
+	// RFC 1952, section 2.3.1.
+	var gzipFooter [8]byte
+	binary.LittleEndian.PutUint32(gzipFooter[0:4], crc32.ChecksumIEEE(in))
+	binary.LittleEndian.PutUint32(gzipFooter[4:8], uint32(len(in)))
+
+	// Encode the input without compression using raw DEFLATE blocks.
+	out = make([]byte, 0, len(gzipHeader)+len(blockHeader)*numBlocks+len(in)+len(gzipFooter))
+	out = append(out, gzipHeader[:]...)
+	for blockHeader[0] == 0 {
+		blockSize := maxBlockSize
+		if blockSize > len(in) {
+			blockHeader[0] = 0x01 // final bit per RFC 1951, section 3.2.3.
+			blockSize = len(in)
+		}
+		binary.LittleEndian.PutUint16(blockHeader[1:3], uint16(blockSize)^0x0000)
+		binary.LittleEndian.PutUint16(blockHeader[3:5], uint16(blockSize)^0xffff)
+		out = append(out, blockHeader[:]...)
+		out = append(out, in[:blockSize]...)
+		in = in[blockSize:]
+	}
+	out = append(out, gzipFooter[:]...)
+	return out
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/legacy_extension.go b/vendor/google.golang.org/protobuf/internal/impl/legacy_extension.go
new file mode 100644
index 0000000..61757ce
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/legacy_extension.go
@@ -0,0 +1,175 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"reflect"
+
+	"google.golang.org/protobuf/internal/descopts"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	ptag "google.golang.org/protobuf/internal/encoding/tag"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/pragma"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+func (xi *ExtensionInfo) initToLegacy() {
+	xd := xi.desc
+	var parent piface.MessageV1
+	messageName := xd.ContainingMessage().FullName()
+	if mt, _ := preg.GlobalTypes.FindMessageByName(messageName); mt != nil {
+		// Create a new parent message and unwrap it if possible.
+		mv := mt.New().Interface()
+		t := reflect.TypeOf(mv)
+		if mv, ok := mv.(unwrapper); ok {
+			t = reflect.TypeOf(mv.protoUnwrap())
+		}
+
+		// Check whether the message implements the legacy v1 Message interface.
+		mz := reflect.Zero(t).Interface()
+		if mz, ok := mz.(piface.MessageV1); ok {
+			parent = mz
+		}
+	}
+
+	// Determine the v1 extension type, which is unfortunately not the same as
+	// the v2 ExtensionType.GoType.
+	extType := xi.goType
+	switch extType.Kind() {
+	case reflect.Bool, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64, reflect.String:
+		extType = reflect.PtrTo(extType) // T -> *T for singular scalar fields
+	}
+
+	// Reconstruct the legacy enum full name.
+	var enumName string
+	if xd.Kind() == pref.EnumKind {
+		enumName = legacyEnumName(xd.Enum())
+	}
+
+	// Derive the proto file that the extension was declared within.
+	var filename string
+	if fd := xd.ParentFile(); fd != nil {
+		filename = fd.Path()
+	}
+
+	// For MessageSet extensions, the name used is the parent message.
+	name := xd.FullName()
+	if messageset.IsMessageSetExtension(xd) {
+		name = name.Parent()
+	}
+
+	xi.ExtendedType = parent
+	xi.ExtensionType = reflect.Zero(extType).Interface()
+	xi.Field = int32(xd.Number())
+	xi.Name = string(name)
+	xi.Tag = ptag.Marshal(xd, enumName)
+	xi.Filename = filename
+}
+
+// initFromLegacy initializes an ExtensionInfo from
+// the contents of the deprecated exported fields of the type.
+func (xi *ExtensionInfo) initFromLegacy() {
+	// The v1 API returns "type incomplete" descriptors where only the
+	// field number is specified. In such a case, use a placeholder.
+	if xi.ExtendedType == nil || xi.ExtensionType == nil {
+		xd := placeholderExtension{
+			name:   pref.FullName(xi.Name),
+			number: pref.FieldNumber(xi.Field),
+		}
+		xi.desc = extensionTypeDescriptor{xd, xi}
+		return
+	}
+
+	// Resolve enum or message dependencies.
+	var ed pref.EnumDescriptor
+	var md pref.MessageDescriptor
+	t := reflect.TypeOf(xi.ExtensionType)
+	isOptional := t.Kind() == reflect.Ptr && t.Elem().Kind() != reflect.Struct
+	isRepeated := t.Kind() == reflect.Slice && t.Elem().Kind() != reflect.Uint8
+	if isOptional || isRepeated {
+		t = t.Elem()
+	}
+	switch v := reflect.Zero(t).Interface().(type) {
+	case pref.Enum:
+		ed = v.Descriptor()
+	case enumV1:
+		ed = LegacyLoadEnumDesc(t)
+	case pref.ProtoMessage:
+		md = v.ProtoReflect().Descriptor()
+	case messageV1:
+		md = LegacyLoadMessageDesc(t)
+	}
+
+	// Derive basic field information from the struct tag.
+	var evs pref.EnumValueDescriptors
+	if ed != nil {
+		evs = ed.Values()
+	}
+	fd := ptag.Unmarshal(xi.Tag, t, evs).(*filedesc.Field)
+
+	// Construct a v2 ExtensionType.
+	xd := &filedesc.Extension{L2: new(filedesc.ExtensionL2)}
+	xd.L0.ParentFile = filedesc.SurrogateProto2
+	xd.L0.FullName = pref.FullName(xi.Name)
+	xd.L1.Number = pref.FieldNumber(xi.Field)
+	xd.L1.Cardinality = fd.L1.Cardinality
+	xd.L1.Kind = fd.L1.Kind
+	xd.L2.IsPacked = fd.L1.IsPacked
+	xd.L2.Default = fd.L1.Default
+	xd.L1.Extendee = Export{}.MessageDescriptorOf(xi.ExtendedType)
+	xd.L2.Enum = ed
+	xd.L2.Message = md
+
+	// Derive real extension field name for MessageSets.
+	if messageset.IsMessageSet(xd.L1.Extendee) && md.FullName() == xd.L0.FullName {
+		xd.L0.FullName = xd.L0.FullName.Append(messageset.ExtensionName)
+	}
+
+	tt := reflect.TypeOf(xi.ExtensionType)
+	if isOptional {
+		tt = tt.Elem()
+	}
+	xi.goType = tt
+	xi.desc = extensionTypeDescriptor{xd, xi}
+}
+
+type placeholderExtension struct {
+	name   pref.FullName
+	number pref.FieldNumber
+}
+
+func (x placeholderExtension) ParentFile() pref.FileDescriptor            { return nil }
+func (x placeholderExtension) Parent() pref.Descriptor                    { return nil }
+func (x placeholderExtension) Index() int                                 { return 0 }
+func (x placeholderExtension) Syntax() pref.Syntax                        { return 0 }
+func (x placeholderExtension) Name() pref.Name                            { return x.name.Name() }
+func (x placeholderExtension) FullName() pref.FullName                    { return x.name }
+func (x placeholderExtension) IsPlaceholder() bool                        { return true }
+func (x placeholderExtension) Options() pref.ProtoMessage                 { return descopts.Field }
+func (x placeholderExtension) Number() pref.FieldNumber                   { return x.number }
+func (x placeholderExtension) Cardinality() pref.Cardinality              { return 0 }
+func (x placeholderExtension) Kind() pref.Kind                            { return 0 }
+func (x placeholderExtension) HasJSONName() bool                          { return false }
+func (x placeholderExtension) JSONName() string                           { return "" }
+func (x placeholderExtension) HasPresence() bool                          { return false }
+func (x placeholderExtension) HasOptionalKeyword() bool                   { return false }
+func (x placeholderExtension) IsExtension() bool                          { return true }
+func (x placeholderExtension) IsWeak() bool                               { return false }
+func (x placeholderExtension) IsPacked() bool                             { return false }
+func (x placeholderExtension) IsList() bool                               { return false }
+func (x placeholderExtension) IsMap() bool                                { return false }
+func (x placeholderExtension) MapKey() pref.FieldDescriptor               { return nil }
+func (x placeholderExtension) MapValue() pref.FieldDescriptor             { return nil }
+func (x placeholderExtension) HasDefault() bool                           { return false }
+func (x placeholderExtension) Default() pref.Value                        { return pref.Value{} }
+func (x placeholderExtension) DefaultEnumValue() pref.EnumValueDescriptor { return nil }
+func (x placeholderExtension) ContainingOneof() pref.OneofDescriptor      { return nil }
+func (x placeholderExtension) ContainingMessage() pref.MessageDescriptor  { return nil }
+func (x placeholderExtension) Enum() pref.EnumDescriptor                  { return nil }
+func (x placeholderExtension) Message() pref.MessageDescriptor            { return nil }
+func (x placeholderExtension) ProtoType(pref.FieldDescriptor)             { return }
+func (x placeholderExtension) ProtoInternal(pragma.DoNotImplement)        { return }
diff --git a/vendor/google.golang.org/protobuf/internal/impl/legacy_file.go b/vendor/google.golang.org/protobuf/internal/impl/legacy_file.go
new file mode 100644
index 0000000..9ab0910
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/legacy_file.go
@@ -0,0 +1,81 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io/ioutil"
+	"sync"
+
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// Every enum and message type generated by protoc-gen-go since commit 2fc053c5
+// on February 25th, 2016 has had a method to get the raw descriptor.
+// Types that were not generated by protoc-gen-go or were generated prior
+// to that version are not supported.
+//
+// The []byte returned is the encoded form of a FileDescriptorProto message
+// compressed using GZIP. The []int is the path from the top-level file
+// to the specific message or enum declaration.
+type (
+	enumV1 interface {
+		EnumDescriptor() ([]byte, []int)
+	}
+	messageV1 interface {
+		Descriptor() ([]byte, []int)
+	}
+)
+
+var legacyFileDescCache sync.Map // map[*byte]protoreflect.FileDescriptor
+
+// legacyLoadFileDesc unmarshals b as a compressed FileDescriptorProto message.
+//
+// This assumes that b is immutable and that b does not refer to part of a
+// concatenated series of GZIP files (which would require shenanigans that
+// rely on the concatenation properties of both protobufs and GZIP).
+// File descriptors generated by protoc-gen-go do not rely on that property.
+func legacyLoadFileDesc(b []byte) protoreflect.FileDescriptor {
+	// Fast-path: check whether we already have a cached file descriptor.
+	if fd, ok := legacyFileDescCache.Load(&b[0]); ok {
+		return fd.(protoreflect.FileDescriptor)
+	}
+
+	// Slow-path: decompress and unmarshal the file descriptor proto.
+	zr, err := gzip.NewReader(bytes.NewReader(b))
+	if err != nil {
+		panic(err)
+	}
+	b2, err := ioutil.ReadAll(zr)
+	if err != nil {
+		panic(err)
+	}
+
+	fd := filedesc.Builder{
+		RawDescriptor: b2,
+		FileRegistry:  resolverOnly{protoregistry.GlobalFiles}, // do not register back to global registry
+	}.Build().File
+	if fd, ok := legacyFileDescCache.LoadOrStore(&b[0], fd); ok {
+		return fd.(protoreflect.FileDescriptor)
+	}
+	return fd
+}
+
+type resolverOnly struct {
+	reg *protoregistry.Files
+}
+
+func (r resolverOnly) FindFileByPath(path string) (protoreflect.FileDescriptor, error) {
+	return r.reg.FindFileByPath(path)
+}
+func (r resolverOnly) FindDescriptorByName(name protoreflect.FullName) (protoreflect.Descriptor, error) {
+	return r.reg.FindDescriptorByName(name)
+}
+func (resolverOnly) RegisterFile(protoreflect.FileDescriptor) error {
+	return nil
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/legacy_message.go b/vendor/google.golang.org/protobuf/internal/impl/legacy_message.go
new file mode 100644
index 0000000..06c68e1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/legacy_message.go
@@ -0,0 +1,502 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"sync"
+
+	"google.golang.org/protobuf/internal/descopts"
+	ptag "google.golang.org/protobuf/internal/encoding/tag"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// legacyWrapMessage wraps v as a protoreflect.Message,
+// where v must be a *struct kind and not implement the v2 API already.
+func legacyWrapMessage(v reflect.Value) pref.Message {
+	typ := v.Type()
+	if typ.Kind() != reflect.Ptr || typ.Elem().Kind() != reflect.Struct {
+		return aberrantMessage{v: v}
+	}
+	mt := legacyLoadMessageInfo(typ, "")
+	return mt.MessageOf(v.Interface())
+}
+
+var legacyMessageTypeCache sync.Map // map[reflect.Type]*MessageInfo
+
+// legacyLoadMessageInfo dynamically loads a *MessageInfo for t,
+// where t must be a *struct kind and not implement the v2 API already.
+// The provided name is used if it cannot be determined from the message.
+func legacyLoadMessageInfo(t reflect.Type, name pref.FullName) *MessageInfo {
+	// Fast-path: check if a MessageInfo is cached for this concrete type.
+	if mt, ok := legacyMessageTypeCache.Load(t); ok {
+		return mt.(*MessageInfo)
+	}
+
+	// Slow-path: derive message descriptor and initialize MessageInfo.
+	mi := &MessageInfo{
+		Desc:          legacyLoadMessageDesc(t, name),
+		GoReflectType: t,
+	}
+
+	v := reflect.Zero(t).Interface()
+	if _, ok := v.(legacyMarshaler); ok {
+		mi.methods.Marshal = legacyMarshal
+
+		// We have no way to tell whether the type's Marshal method
+		// supports deterministic serialization or not, but this
+		// preserves the v1 implementation's behavior of always
+		// calling Marshal methods when present.
+		mi.methods.Flags |= piface.SupportMarshalDeterministic
+	}
+	if _, ok := v.(legacyUnmarshaler); ok {
+		mi.methods.Unmarshal = legacyUnmarshal
+	}
+	if _, ok := v.(legacyMerger); ok {
+		mi.methods.Merge = legacyMerge
+	}
+
+	if mi, ok := legacyMessageTypeCache.LoadOrStore(t, mi); ok {
+		return mi.(*MessageInfo)
+	}
+	return mi
+}
+
+var legacyMessageDescCache sync.Map // map[reflect.Type]protoreflect.MessageDescriptor
+
+// LegacyLoadMessageDesc returns an MessageDescriptor derived from the Go type,
+// which must be a *struct kind and not implement the v2 API already.
+//
+// This is exported for testing purposes.
+func LegacyLoadMessageDesc(t reflect.Type) pref.MessageDescriptor {
+	return legacyLoadMessageDesc(t, "")
+}
+func legacyLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
+	// Fast-path: check if a MessageDescriptor is cached for this concrete type.
+	if mi, ok := legacyMessageDescCache.Load(t); ok {
+		return mi.(pref.MessageDescriptor)
+	}
+
+	// Slow-path: initialize MessageDescriptor from the raw descriptor.
+	mv := reflect.Zero(t).Interface()
+	if _, ok := mv.(pref.ProtoMessage); ok {
+		panic(fmt.Sprintf("%v already implements proto.Message", t))
+	}
+	mdV1, ok := mv.(messageV1)
+	if !ok {
+		return aberrantLoadMessageDesc(t, name)
+	}
+
+	// If this is a dynamic message type where there isn't a 1-1 mapping between
+	// Go and protobuf types, calling the Descriptor method on the zero value of
+	// the message type isn't likely to work. If it panics, swallow the panic and
+	// continue as if the Descriptor method wasn't present.
+	b, idxs := func() ([]byte, []int) {
+		defer func() {
+			recover()
+		}()
+		return mdV1.Descriptor()
+	}()
+	if b == nil {
+		return aberrantLoadMessageDesc(t, name)
+	}
+
+	// If the Go type has no fields, then this might be a proto3 empty message
+	// from before the size cache was added. If there are any fields, check to
+	// see that at least one of them looks like something we generated.
+	if nfield := t.Elem().NumField(); nfield > 0 {
+		hasProtoField := false
+		for i := 0; i < nfield; i++ {
+			f := t.Elem().Field(i)
+			if f.Tag.Get("protobuf") != "" || f.Tag.Get("protobuf_oneof") != "" || strings.HasPrefix(f.Name, "XXX_") {
+				hasProtoField = true
+				break
+			}
+		}
+		if !hasProtoField {
+			return aberrantLoadMessageDesc(t, name)
+		}
+	}
+
+	md := legacyLoadFileDesc(b).Messages().Get(idxs[0])
+	for _, i := range idxs[1:] {
+		md = md.Messages().Get(i)
+	}
+	if name != "" && md.FullName() != name {
+		panic(fmt.Sprintf("mismatching message name: got %v, want %v", md.FullName(), name))
+	}
+	if md, ok := legacyMessageDescCache.LoadOrStore(t, md); ok {
+		return md.(protoreflect.MessageDescriptor)
+	}
+	return md
+}
+
+var (
+	aberrantMessageDescLock  sync.Mutex
+	aberrantMessageDescCache map[reflect.Type]protoreflect.MessageDescriptor
+)
+
+// aberrantLoadMessageDesc returns an MessageDescriptor derived from the Go type,
+// which must not implement protoreflect.ProtoMessage or messageV1.
+//
+// This is a best-effort derivation of the message descriptor using the protobuf
+// tags on the struct fields.
+func aberrantLoadMessageDesc(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
+	aberrantMessageDescLock.Lock()
+	defer aberrantMessageDescLock.Unlock()
+	if aberrantMessageDescCache == nil {
+		aberrantMessageDescCache = make(map[reflect.Type]protoreflect.MessageDescriptor)
+	}
+	return aberrantLoadMessageDescReentrant(t, name)
+}
+func aberrantLoadMessageDescReentrant(t reflect.Type, name pref.FullName) pref.MessageDescriptor {
+	// Fast-path: check if an MessageDescriptor is cached for this concrete type.
+	if md, ok := aberrantMessageDescCache[t]; ok {
+		return md
+	}
+
+	// Slow-path: construct a descriptor from the Go struct type (best-effort).
+	// Cache the MessageDescriptor early on so that we can resolve internal
+	// cyclic references.
+	md := &filedesc.Message{L2: new(filedesc.MessageL2)}
+	md.L0.FullName = aberrantDeriveMessageName(t, name)
+	md.L0.ParentFile = filedesc.SurrogateProto2
+	aberrantMessageDescCache[t] = md
+
+	if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Struct {
+		return md
+	}
+
+	// Try to determine if the message is using proto3 by checking scalars.
+	for i := 0; i < t.Elem().NumField(); i++ {
+		f := t.Elem().Field(i)
+		if tag := f.Tag.Get("protobuf"); tag != "" {
+			switch f.Type.Kind() {
+			case reflect.Bool, reflect.Int32, reflect.Int64, reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64, reflect.String:
+				md.L0.ParentFile = filedesc.SurrogateProto3
+			}
+			for _, s := range strings.Split(tag, ",") {
+				if s == "proto3" {
+					md.L0.ParentFile = filedesc.SurrogateProto3
+				}
+			}
+		}
+	}
+
+	// Obtain a list of oneof wrapper types.
+	var oneofWrappers []reflect.Type
+	for _, method := range []string{"XXX_OneofFuncs", "XXX_OneofWrappers"} {
+		if fn, ok := t.MethodByName(method); ok {
+			for _, v := range fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))}) {
+				if vs, ok := v.Interface().([]interface{}); ok {
+					for _, v := range vs {
+						oneofWrappers = append(oneofWrappers, reflect.TypeOf(v))
+					}
+				}
+			}
+		}
+	}
+
+	// Obtain a list of the extension ranges.
+	if fn, ok := t.MethodByName("ExtensionRangeArray"); ok {
+		vs := fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))})[0]
+		for i := 0; i < vs.Len(); i++ {
+			v := vs.Index(i)
+			md.L2.ExtensionRanges.List = append(md.L2.ExtensionRanges.List, [2]pref.FieldNumber{
+				pref.FieldNumber(v.FieldByName("Start").Int()),
+				pref.FieldNumber(v.FieldByName("End").Int() + 1),
+			})
+			md.L2.ExtensionRangeOptions = append(md.L2.ExtensionRangeOptions, nil)
+		}
+	}
+
+	// Derive the message fields by inspecting the struct fields.
+	for i := 0; i < t.Elem().NumField(); i++ {
+		f := t.Elem().Field(i)
+		if tag := f.Tag.Get("protobuf"); tag != "" {
+			tagKey := f.Tag.Get("protobuf_key")
+			tagVal := f.Tag.Get("protobuf_val")
+			aberrantAppendField(md, f.Type, tag, tagKey, tagVal)
+		}
+		if tag := f.Tag.Get("protobuf_oneof"); tag != "" {
+			n := len(md.L2.Oneofs.List)
+			md.L2.Oneofs.List = append(md.L2.Oneofs.List, filedesc.Oneof{})
+			od := &md.L2.Oneofs.List[n]
+			od.L0.FullName = md.FullName().Append(pref.Name(tag))
+			od.L0.ParentFile = md.L0.ParentFile
+			od.L0.Parent = md
+			od.L0.Index = n
+
+			for _, t := range oneofWrappers {
+				if t.Implements(f.Type) {
+					f := t.Elem().Field(0)
+					if tag := f.Tag.Get("protobuf"); tag != "" {
+						aberrantAppendField(md, f.Type, tag, "", "")
+						fd := &md.L2.Fields.List[len(md.L2.Fields.List)-1]
+						fd.L1.ContainingOneof = od
+						od.L1.Fields.List = append(od.L1.Fields.List, fd)
+					}
+				}
+			}
+		}
+	}
+
+	return md
+}
+
+func aberrantDeriveMessageName(t reflect.Type, name pref.FullName) pref.FullName {
+	if name.IsValid() {
+		return name
+	}
+	func() {
+		defer func() { recover() }() // swallow possible nil panics
+		if m, ok := reflect.Zero(t).Interface().(interface{ XXX_MessageName() string }); ok {
+			name = pref.FullName(m.XXX_MessageName())
+		}
+	}()
+	if name.IsValid() {
+		return name
+	}
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	return AberrantDeriveFullName(t)
+}
+
+func aberrantAppendField(md *filedesc.Message, goType reflect.Type, tag, tagKey, tagVal string) {
+	t := goType
+	isOptional := t.Kind() == reflect.Ptr && t.Elem().Kind() != reflect.Struct
+	isRepeated := t.Kind() == reflect.Slice && t.Elem().Kind() != reflect.Uint8
+	if isOptional || isRepeated {
+		t = t.Elem()
+	}
+	fd := ptag.Unmarshal(tag, t, placeholderEnumValues{}).(*filedesc.Field)
+
+	// Append field descriptor to the message.
+	n := len(md.L2.Fields.List)
+	md.L2.Fields.List = append(md.L2.Fields.List, *fd)
+	fd = &md.L2.Fields.List[n]
+	fd.L0.FullName = md.FullName().Append(fd.Name())
+	fd.L0.ParentFile = md.L0.ParentFile
+	fd.L0.Parent = md
+	fd.L0.Index = n
+
+	if fd.L1.IsWeak || fd.L1.HasPacked {
+		fd.L1.Options = func() pref.ProtoMessage {
+			opts := descopts.Field.ProtoReflect().New()
+			if fd.L1.IsWeak {
+				opts.Set(opts.Descriptor().Fields().ByName("weak"), protoreflect.ValueOfBool(true))
+			}
+			if fd.L1.HasPacked {
+				opts.Set(opts.Descriptor().Fields().ByName("packed"), protoreflect.ValueOfBool(fd.L1.IsPacked))
+			}
+			return opts.Interface()
+		}
+	}
+
+	// Populate Enum and Message.
+	if fd.Enum() == nil && fd.Kind() == pref.EnumKind {
+		switch v := reflect.Zero(t).Interface().(type) {
+		case pref.Enum:
+			fd.L1.Enum = v.Descriptor()
+		default:
+			fd.L1.Enum = LegacyLoadEnumDesc(t)
+		}
+	}
+	if fd.Message() == nil && (fd.Kind() == pref.MessageKind || fd.Kind() == pref.GroupKind) {
+		switch v := reflect.Zero(t).Interface().(type) {
+		case pref.ProtoMessage:
+			fd.L1.Message = v.ProtoReflect().Descriptor()
+		case messageV1:
+			fd.L1.Message = LegacyLoadMessageDesc(t)
+		default:
+			if t.Kind() == reflect.Map {
+				n := len(md.L1.Messages.List)
+				md.L1.Messages.List = append(md.L1.Messages.List, filedesc.Message{L2: new(filedesc.MessageL2)})
+				md2 := &md.L1.Messages.List[n]
+				md2.L0.FullName = md.FullName().Append(pref.Name(strs.MapEntryName(string(fd.Name()))))
+				md2.L0.ParentFile = md.L0.ParentFile
+				md2.L0.Parent = md
+				md2.L0.Index = n
+
+				md2.L1.IsMapEntry = true
+				md2.L2.Options = func() pref.ProtoMessage {
+					opts := descopts.Message.ProtoReflect().New()
+					opts.Set(opts.Descriptor().Fields().ByName("map_entry"), protoreflect.ValueOfBool(true))
+					return opts.Interface()
+				}
+
+				aberrantAppendField(md2, t.Key(), tagKey, "", "")
+				aberrantAppendField(md2, t.Elem(), tagVal, "", "")
+
+				fd.L1.Message = md2
+				break
+			}
+			fd.L1.Message = aberrantLoadMessageDescReentrant(t, "")
+		}
+	}
+}
+
+type placeholderEnumValues struct {
+	protoreflect.EnumValueDescriptors
+}
+
+func (placeholderEnumValues) ByNumber(n pref.EnumNumber) pref.EnumValueDescriptor {
+	return filedesc.PlaceholderEnumValue(pref.FullName(fmt.Sprintf("UNKNOWN_%d", n)))
+}
+
+// legacyMarshaler is the proto.Marshaler interface superseded by protoiface.Methoder.
+type legacyMarshaler interface {
+	Marshal() ([]byte, error)
+}
+
+// legacyUnmarshaler is the proto.Unmarshaler interface superseded by protoiface.Methoder.
+type legacyUnmarshaler interface {
+	Unmarshal([]byte) error
+}
+
+// legacyMerger is the proto.Merger interface superseded by protoiface.Methoder.
+type legacyMerger interface {
+	Merge(protoiface.MessageV1)
+}
+
+var legacyProtoMethods = &piface.Methods{
+	Marshal:   legacyMarshal,
+	Unmarshal: legacyUnmarshal,
+	Merge:     legacyMerge,
+
+	// We have no way to tell whether the type's Marshal method
+	// supports deterministic serialization or not, but this
+	// preserves the v1 implementation's behavior of always
+	// calling Marshal methods when present.
+	Flags: piface.SupportMarshalDeterministic,
+}
+
+func legacyMarshal(in piface.MarshalInput) (piface.MarshalOutput, error) {
+	v := in.Message.(unwrapper).protoUnwrap()
+	marshaler, ok := v.(legacyMarshaler)
+	if !ok {
+		return piface.MarshalOutput{}, errors.New("%T does not implement Marshal", v)
+	}
+	out, err := marshaler.Marshal()
+	if in.Buf != nil {
+		out = append(in.Buf, out...)
+	}
+	return piface.MarshalOutput{
+		Buf: out,
+	}, err
+}
+
+func legacyUnmarshal(in piface.UnmarshalInput) (piface.UnmarshalOutput, error) {
+	v := in.Message.(unwrapper).protoUnwrap()
+	unmarshaler, ok := v.(legacyUnmarshaler)
+	if !ok {
+		return piface.UnmarshalOutput{}, errors.New("%T does not implement Marshal", v)
+	}
+	return piface.UnmarshalOutput{}, unmarshaler.Unmarshal(in.Buf)
+}
+
+func legacyMerge(in piface.MergeInput) piface.MergeOutput {
+	dstv := in.Destination.(unwrapper).protoUnwrap()
+	merger, ok := dstv.(legacyMerger)
+	if !ok {
+		return piface.MergeOutput{}
+	}
+	merger.Merge(Export{}.ProtoMessageV1Of(in.Source))
+	return piface.MergeOutput{Flags: piface.MergeComplete}
+}
+
+// aberrantMessageType implements MessageType for all types other than pointer-to-struct.
+type aberrantMessageType struct {
+	t reflect.Type
+}
+
+func (mt aberrantMessageType) New() pref.Message {
+	return aberrantMessage{reflect.Zero(mt.t)}
+}
+func (mt aberrantMessageType) Zero() pref.Message {
+	return aberrantMessage{reflect.Zero(mt.t)}
+}
+func (mt aberrantMessageType) GoType() reflect.Type {
+	return mt.t
+}
+func (mt aberrantMessageType) Descriptor() pref.MessageDescriptor {
+	return LegacyLoadMessageDesc(mt.t)
+}
+
+// aberrantMessage implements Message for all types other than pointer-to-struct.
+//
+// When the underlying type implements legacyMarshaler or legacyUnmarshaler,
+// the aberrant Message can be marshaled or unmarshaled. Otherwise, there is
+// not much that can be done with values of this type.
+type aberrantMessage struct {
+	v reflect.Value
+}
+
+func (m aberrantMessage) ProtoReflect() pref.Message {
+	return m
+}
+
+func (m aberrantMessage) Descriptor() pref.MessageDescriptor {
+	return LegacyLoadMessageDesc(m.v.Type())
+}
+func (m aberrantMessage) Type() pref.MessageType {
+	return aberrantMessageType{m.v.Type()}
+}
+func (m aberrantMessage) New() pref.Message {
+	return aberrantMessage{reflect.Zero(m.v.Type())}
+}
+func (m aberrantMessage) Interface() pref.ProtoMessage {
+	return m
+}
+func (m aberrantMessage) Range(f func(pref.FieldDescriptor, pref.Value) bool) {
+}
+func (m aberrantMessage) Has(pref.FieldDescriptor) bool {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) Clear(pref.FieldDescriptor) {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) Get(pref.FieldDescriptor) pref.Value {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) Set(pref.FieldDescriptor, pref.Value) {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) Mutable(pref.FieldDescriptor) pref.Value {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) NewField(pref.FieldDescriptor) pref.Value {
+	panic("invalid field descriptor")
+}
+func (m aberrantMessage) WhichOneof(pref.OneofDescriptor) pref.FieldDescriptor {
+	panic("invalid oneof descriptor")
+}
+func (m aberrantMessage) GetUnknown() pref.RawFields {
+	return nil
+}
+func (m aberrantMessage) SetUnknown(pref.RawFields) {
+	// SetUnknown discards its input on messages which don't support unknown field storage.
+}
+func (m aberrantMessage) IsValid() bool {
+	// An invalid message is a read-only, empty message. Since we don't know anything
+	// about the alleged contents of this message, we can't say with confidence that
+	// it is invalid in this sense. Therefore, report it as valid.
+	return true
+}
+func (m aberrantMessage) ProtoMethods() *piface.Methods {
+	return legacyProtoMethods
+}
+func (m aberrantMessage) protoUnwrap() interface{} {
+	return m.v.Interface()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/merge.go b/vendor/google.golang.org/protobuf/internal/impl/merge.go
new file mode 100644
index 0000000..cdc4267
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/merge.go
@@ -0,0 +1,176 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+type mergeOptions struct{}
+
+func (o mergeOptions) Merge(dst, src proto.Message) {
+	proto.Merge(dst, src)
+}
+
+// merge is protoreflect.Methods.Merge.
+func (mi *MessageInfo) merge(in piface.MergeInput) piface.MergeOutput {
+	dp, ok := mi.getPointer(in.Destination)
+	if !ok {
+		return piface.MergeOutput{}
+	}
+	sp, ok := mi.getPointer(in.Source)
+	if !ok {
+		return piface.MergeOutput{}
+	}
+	mi.mergePointer(dp, sp, mergeOptions{})
+	return piface.MergeOutput{Flags: piface.MergeComplete}
+}
+
+func (mi *MessageInfo) mergePointer(dst, src pointer, opts mergeOptions) {
+	mi.init()
+	if dst.IsNil() {
+		panic(fmt.Sprintf("invalid value: merging into nil message"))
+	}
+	if src.IsNil() {
+		return
+	}
+	for _, f := range mi.orderedCoderFields {
+		if f.funcs.merge == nil {
+			continue
+		}
+		sfptr := src.Apply(f.offset)
+		if f.isPointer && sfptr.Elem().IsNil() {
+			continue
+		}
+		f.funcs.merge(dst.Apply(f.offset), sfptr, f, opts)
+	}
+	if mi.extensionOffset.IsValid() {
+		sext := src.Apply(mi.extensionOffset).Extensions()
+		dext := dst.Apply(mi.extensionOffset).Extensions()
+		if *dext == nil {
+			*dext = make(map[int32]ExtensionField)
+		}
+		for num, sx := range *sext {
+			xt := sx.Type()
+			xi := getExtensionFieldInfo(xt)
+			if xi.funcs.merge == nil {
+				continue
+			}
+			dx := (*dext)[num]
+			var dv pref.Value
+			if dx.Type() == sx.Type() {
+				dv = dx.Value()
+			}
+			if !dv.IsValid() && xi.unmarshalNeedsValue {
+				dv = xt.New()
+			}
+			dv = xi.funcs.merge(dv, sx.Value(), opts)
+			dx.Set(sx.Type(), dv)
+			(*dext)[num] = dx
+		}
+	}
+	if mi.unknownOffset.IsValid() {
+		du := dst.Apply(mi.unknownOffset).Bytes()
+		su := src.Apply(mi.unknownOffset).Bytes()
+		if len(*su) > 0 {
+			*du = append(*du, *su...)
+		}
+	}
+}
+
+func mergeScalarValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	return src
+}
+
+func mergeBytesValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	return pref.ValueOfBytes(append(emptyBuf[:], src.Bytes()...))
+}
+
+func mergeListValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	dstl := dst.List()
+	srcl := src.List()
+	for i, llen := 0, srcl.Len(); i < llen; i++ {
+		dstl.Append(srcl.Get(i))
+	}
+	return dst
+}
+
+func mergeBytesListValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	dstl := dst.List()
+	srcl := src.List()
+	for i, llen := 0, srcl.Len(); i < llen; i++ {
+		sb := srcl.Get(i).Bytes()
+		db := append(emptyBuf[:], sb...)
+		dstl.Append(pref.ValueOfBytes(db))
+	}
+	return dst
+}
+
+func mergeMessageListValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	dstl := dst.List()
+	srcl := src.List()
+	for i, llen := 0, srcl.Len(); i < llen; i++ {
+		sm := srcl.Get(i).Message()
+		dm := proto.Clone(sm.Interface()).ProtoReflect()
+		dstl.Append(pref.ValueOfMessage(dm))
+	}
+	return dst
+}
+
+func mergeMessageValue(dst, src pref.Value, opts mergeOptions) pref.Value {
+	opts.Merge(dst.Message().Interface(), src.Message().Interface())
+	return dst
+}
+
+func mergeMessage(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+	if f.mi != nil {
+		if dst.Elem().IsNil() {
+			dst.SetPointer(pointerOfValue(reflect.New(f.mi.GoReflectType.Elem())))
+		}
+		f.mi.mergePointer(dst.Elem(), src.Elem(), opts)
+	} else {
+		dm := dst.AsValueOf(f.ft).Elem()
+		sm := src.AsValueOf(f.ft).Elem()
+		if dm.IsNil() {
+			dm.Set(reflect.New(f.ft.Elem()))
+		}
+		opts.Merge(asMessage(dm), asMessage(sm))
+	}
+}
+
+func mergeMessageSlice(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
+	for _, sp := range src.PointerSlice() {
+		dm := reflect.New(f.ft.Elem().Elem())
+		if f.mi != nil {
+			f.mi.mergePointer(pointerOfValue(dm), sp, opts)
+		} else {
+			opts.Merge(asMessage(dm), asMessage(sp.AsValueOf(f.ft.Elem().Elem())))
+		}
+		dst.AppendPointerSlice(pointerOfValue(dm))
+	}
+}
+
+func mergeBytes(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Bytes() = append(emptyBuf[:], *src.Bytes()...)
+}
+
+func mergeBytesNoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Bytes()
+	if len(v) > 0 {
+		*dst.Bytes() = append(emptyBuf[:], v...)
+	}
+}
+
+func mergeBytesSlice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.BytesSlice()
+	for _, v := range *src.BytesSlice() {
+		*ds = append(*ds, append(emptyBuf[:], v...))
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/merge_gen.go b/vendor/google.golang.org/protobuf/internal/impl/merge_gen.go
new file mode 100644
index 0000000..8816c27
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/merge_gen.go
@@ -0,0 +1,209 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package impl
+
+import ()
+
+func mergeBool(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Bool() = *src.Bool()
+}
+
+func mergeBoolNoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Bool()
+	if v != false {
+		*dst.Bool() = v
+	}
+}
+
+func mergeBoolPtr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.BoolPtr()
+	if p != nil {
+		v := *p
+		*dst.BoolPtr() = &v
+	}
+}
+
+func mergeBoolSlice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.BoolSlice()
+	ss := src.BoolSlice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeInt32(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Int32() = *src.Int32()
+}
+
+func mergeInt32NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Int32()
+	if v != 0 {
+		*dst.Int32() = v
+	}
+}
+
+func mergeInt32Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Int32Ptr()
+	if p != nil {
+		v := *p
+		*dst.Int32Ptr() = &v
+	}
+}
+
+func mergeInt32Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Int32Slice()
+	ss := src.Int32Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeUint32(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Uint32() = *src.Uint32()
+}
+
+func mergeUint32NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Uint32()
+	if v != 0 {
+		*dst.Uint32() = v
+	}
+}
+
+func mergeUint32Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Uint32Ptr()
+	if p != nil {
+		v := *p
+		*dst.Uint32Ptr() = &v
+	}
+}
+
+func mergeUint32Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Uint32Slice()
+	ss := src.Uint32Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeInt64(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Int64() = *src.Int64()
+}
+
+func mergeInt64NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Int64()
+	if v != 0 {
+		*dst.Int64() = v
+	}
+}
+
+func mergeInt64Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Int64Ptr()
+	if p != nil {
+		v := *p
+		*dst.Int64Ptr() = &v
+	}
+}
+
+func mergeInt64Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Int64Slice()
+	ss := src.Int64Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeUint64(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Uint64() = *src.Uint64()
+}
+
+func mergeUint64NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Uint64()
+	if v != 0 {
+		*dst.Uint64() = v
+	}
+}
+
+func mergeUint64Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Uint64Ptr()
+	if p != nil {
+		v := *p
+		*dst.Uint64Ptr() = &v
+	}
+}
+
+func mergeUint64Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Uint64Slice()
+	ss := src.Uint64Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeFloat32(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Float32() = *src.Float32()
+}
+
+func mergeFloat32NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Float32()
+	if v != 0 {
+		*dst.Float32() = v
+	}
+}
+
+func mergeFloat32Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Float32Ptr()
+	if p != nil {
+		v := *p
+		*dst.Float32Ptr() = &v
+	}
+}
+
+func mergeFloat32Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Float32Slice()
+	ss := src.Float32Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeFloat64(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.Float64() = *src.Float64()
+}
+
+func mergeFloat64NoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.Float64()
+	if v != 0 {
+		*dst.Float64() = v
+	}
+}
+
+func mergeFloat64Ptr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.Float64Ptr()
+	if p != nil {
+		v := *p
+		*dst.Float64Ptr() = &v
+	}
+}
+
+func mergeFloat64Slice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.Float64Slice()
+	ss := src.Float64Slice()
+	*ds = append(*ds, *ss...)
+}
+
+func mergeString(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	*dst.String() = *src.String()
+}
+
+func mergeStringNoZero(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	v := *src.String()
+	if v != "" {
+		*dst.String() = v
+	}
+}
+
+func mergeStringPtr(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	p := *src.StringPtr()
+	if p != nil {
+		v := *p
+		*dst.StringPtr() = &v
+	}
+}
+
+func mergeStringSlice(dst, src pointer, _ *coderFieldInfo, _ mergeOptions) {
+	ds := dst.StringSlice()
+	ss := src.StringSlice()
+	*ds = append(*ds, *ss...)
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/message.go b/vendor/google.golang.org/protobuf/internal/impl/message.go
new file mode 100644
index 0000000..7dd994b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/message.go
@@ -0,0 +1,215 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"google.golang.org/protobuf/internal/genname"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// MessageInfo provides protobuf related functionality for a given Go type
+// that represents a message. A given instance of MessageInfo is tied to
+// exactly one Go type, which must be a pointer to a struct type.
+//
+// The exported fields must be populated before any methods are called
+// and cannot be mutated after set.
+type MessageInfo struct {
+	// GoReflectType is the underlying message Go type and must be populated.
+	GoReflectType reflect.Type // pointer to struct
+
+	// Desc is the underlying message descriptor type and must be populated.
+	Desc pref.MessageDescriptor
+
+	// Exporter must be provided in a purego environment in order to provide
+	// access to unexported fields.
+	Exporter exporter
+
+	// OneofWrappers is list of pointers to oneof wrapper struct types.
+	OneofWrappers []interface{}
+
+	initMu   sync.Mutex // protects all unexported fields
+	initDone uint32
+
+	reflectMessageInfo // for reflection implementation
+	coderMessageInfo   // for fast-path method implementations
+}
+
+// exporter is a function that returns a reference to the ith field of v,
+// where v is a pointer to a struct. It returns nil if it does not support
+// exporting the requested field (e.g., already exported).
+type exporter func(v interface{}, i int) interface{}
+
+// getMessageInfo returns the MessageInfo for any message type that
+// is generated by our implementation of protoc-gen-go (for v2 and on).
+// If it is unable to obtain a MessageInfo, it returns nil.
+func getMessageInfo(mt reflect.Type) *MessageInfo {
+	m, ok := reflect.Zero(mt).Interface().(pref.ProtoMessage)
+	if !ok {
+		return nil
+	}
+	mr, ok := m.ProtoReflect().(interface{ ProtoMessageInfo() *MessageInfo })
+	if !ok {
+		return nil
+	}
+	return mr.ProtoMessageInfo()
+}
+
+func (mi *MessageInfo) init() {
+	// This function is called in the hot path. Inline the sync.Once logic,
+	// since allocating a closure for Once.Do is expensive.
+	// Keep init small to ensure that it can be inlined.
+	if atomic.LoadUint32(&mi.initDone) == 0 {
+		mi.initOnce()
+	}
+}
+
+func (mi *MessageInfo) initOnce() {
+	mi.initMu.Lock()
+	defer mi.initMu.Unlock()
+	if mi.initDone == 1 {
+		return
+	}
+
+	t := mi.GoReflectType
+	if t.Kind() != reflect.Ptr && t.Elem().Kind() != reflect.Struct {
+		panic(fmt.Sprintf("got %v, want *struct kind", t))
+	}
+	t = t.Elem()
+
+	si := mi.makeStructInfo(t)
+	mi.makeReflectFuncs(t, si)
+	mi.makeCoderMethods(t, si)
+
+	atomic.StoreUint32(&mi.initDone, 1)
+}
+
+// getPointer returns the pointer for a message, which should be of
+// the type of the MessageInfo. If the message is of a different type,
+// it returns ok==false.
+func (mi *MessageInfo) getPointer(m pref.Message) (p pointer, ok bool) {
+	switch m := m.(type) {
+	case *messageState:
+		return m.pointer(), m.messageInfo() == mi
+	case *messageReflectWrapper:
+		return m.pointer(), m.messageInfo() == mi
+	}
+	return pointer{}, false
+}
+
+type (
+	SizeCache       = int32
+	WeakFields      = map[int32]protoreflect.ProtoMessage
+	UnknownFields   = []byte
+	ExtensionFields = map[int32]ExtensionField
+)
+
+var (
+	sizecacheType       = reflect.TypeOf(SizeCache(0))
+	weakFieldsType      = reflect.TypeOf(WeakFields(nil))
+	unknownFieldsType   = reflect.TypeOf(UnknownFields(nil))
+	extensionFieldsType = reflect.TypeOf(ExtensionFields(nil))
+)
+
+type structInfo struct {
+	sizecacheOffset offset
+	weakOffset      offset
+	unknownOffset   offset
+	extensionOffset offset
+
+	fieldsByNumber        map[pref.FieldNumber]reflect.StructField
+	oneofsByName          map[pref.Name]reflect.StructField
+	oneofWrappersByType   map[reflect.Type]pref.FieldNumber
+	oneofWrappersByNumber map[pref.FieldNumber]reflect.Type
+}
+
+func (mi *MessageInfo) makeStructInfo(t reflect.Type) structInfo {
+	si := structInfo{
+		sizecacheOffset: invalidOffset,
+		weakOffset:      invalidOffset,
+		unknownOffset:   invalidOffset,
+		extensionOffset: invalidOffset,
+
+		fieldsByNumber:        map[pref.FieldNumber]reflect.StructField{},
+		oneofsByName:          map[pref.Name]reflect.StructField{},
+		oneofWrappersByType:   map[reflect.Type]pref.FieldNumber{},
+		oneofWrappersByNumber: map[pref.FieldNumber]reflect.Type{},
+	}
+
+fieldLoop:
+	for i := 0; i < t.NumField(); i++ {
+		switch f := t.Field(i); f.Name {
+		case genname.SizeCache, genname.SizeCacheA:
+			if f.Type == sizecacheType {
+				si.sizecacheOffset = offsetOf(f, mi.Exporter)
+			}
+		case genname.WeakFields, genname.WeakFieldsA:
+			if f.Type == weakFieldsType {
+				si.weakOffset = offsetOf(f, mi.Exporter)
+			}
+		case genname.UnknownFields, genname.UnknownFieldsA:
+			if f.Type == unknownFieldsType {
+				si.unknownOffset = offsetOf(f, mi.Exporter)
+			}
+		case genname.ExtensionFields, genname.ExtensionFieldsA, genname.ExtensionFieldsB:
+			if f.Type == extensionFieldsType {
+				si.extensionOffset = offsetOf(f, mi.Exporter)
+			}
+		default:
+			for _, s := range strings.Split(f.Tag.Get("protobuf"), ",") {
+				if len(s) > 0 && strings.Trim(s, "0123456789") == "" {
+					n, _ := strconv.ParseUint(s, 10, 64)
+					si.fieldsByNumber[pref.FieldNumber(n)] = f
+					continue fieldLoop
+				}
+			}
+			if s := f.Tag.Get("protobuf_oneof"); len(s) > 0 {
+				si.oneofsByName[pref.Name(s)] = f
+				continue fieldLoop
+			}
+		}
+	}
+
+	// Derive a mapping of oneof wrappers to fields.
+	oneofWrappers := mi.OneofWrappers
+	for _, method := range []string{"XXX_OneofFuncs", "XXX_OneofWrappers"} {
+		if fn, ok := reflect.PtrTo(t).MethodByName(method); ok {
+			for _, v := range fn.Func.Call([]reflect.Value{reflect.Zero(fn.Type.In(0))}) {
+				if vs, ok := v.Interface().([]interface{}); ok {
+					oneofWrappers = vs
+				}
+			}
+		}
+	}
+	for _, v := range oneofWrappers {
+		tf := reflect.TypeOf(v).Elem()
+		f := tf.Field(0)
+		for _, s := range strings.Split(f.Tag.Get("protobuf"), ",") {
+			if len(s) > 0 && strings.Trim(s, "0123456789") == "" {
+				n, _ := strconv.ParseUint(s, 10, 64)
+				si.oneofWrappersByType[tf] = pref.FieldNumber(n)
+				si.oneofWrappersByNumber[pref.FieldNumber(n)] = tf
+				break
+			}
+		}
+	}
+
+	return si
+}
+
+func (mi *MessageInfo) New() protoreflect.Message {
+	return mi.MessageOf(reflect.New(mi.GoReflectType.Elem()).Interface())
+}
+func (mi *MessageInfo) Zero() protoreflect.Message {
+	return mi.MessageOf(reflect.Zero(mi.GoReflectType).Interface())
+}
+func (mi *MessageInfo) Descriptor() protoreflect.MessageDescriptor { return mi.Desc }
diff --git a/vendor/google.golang.org/protobuf/internal/impl/message_reflect.go b/vendor/google.golang.org/protobuf/internal/impl/message_reflect.go
new file mode 100644
index 0000000..0f4b8db
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/message_reflect.go
@@ -0,0 +1,364 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+
+	"google.golang.org/protobuf/internal/pragma"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type reflectMessageInfo struct {
+	fields map[pref.FieldNumber]*fieldInfo
+	oneofs map[pref.Name]*oneofInfo
+
+	// denseFields is a subset of fields where:
+	//	0 < fieldDesc.Number() < len(denseFields)
+	// It provides faster access to the fieldInfo, but may be incomplete.
+	denseFields []*fieldInfo
+
+	// rangeInfos is a list of all fields (not belonging to a oneof) and oneofs.
+	rangeInfos []interface{} // either *fieldInfo or *oneofInfo
+
+	getUnknown   func(pointer) pref.RawFields
+	setUnknown   func(pointer, pref.RawFields)
+	extensionMap func(pointer) *extensionMap
+
+	nilMessage atomicNilMessage
+}
+
+// makeReflectFuncs generates the set of functions to support reflection.
+func (mi *MessageInfo) makeReflectFuncs(t reflect.Type, si structInfo) {
+	mi.makeKnownFieldsFunc(si)
+	mi.makeUnknownFieldsFunc(t, si)
+	mi.makeExtensionFieldsFunc(t, si)
+}
+
+// makeKnownFieldsFunc generates functions for operations that can be performed
+// on each protobuf message field. It takes in a reflect.Type representing the
+// Go struct and matches message fields with struct fields.
+//
+// This code assumes that the struct is well-formed and panics if there are
+// any discrepancies.
+func (mi *MessageInfo) makeKnownFieldsFunc(si structInfo) {
+	mi.fields = map[pref.FieldNumber]*fieldInfo{}
+	md := mi.Desc
+	fds := md.Fields()
+	for i := 0; i < fds.Len(); i++ {
+		fd := fds.Get(i)
+		fs := si.fieldsByNumber[fd.Number()]
+		var fi fieldInfo
+		switch {
+		case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
+			fi = fieldInfoForOneof(fd, si.oneofsByName[fd.ContainingOneof().Name()], mi.Exporter, si.oneofWrappersByNumber[fd.Number()])
+		case fd.IsMap():
+			fi = fieldInfoForMap(fd, fs, mi.Exporter)
+		case fd.IsList():
+			fi = fieldInfoForList(fd, fs, mi.Exporter)
+		case fd.IsWeak():
+			fi = fieldInfoForWeakMessage(fd, si.weakOffset)
+		case fd.Kind() == pref.MessageKind || fd.Kind() == pref.GroupKind:
+			fi = fieldInfoForMessage(fd, fs, mi.Exporter)
+		default:
+			fi = fieldInfoForScalar(fd, fs, mi.Exporter)
+		}
+		mi.fields[fd.Number()] = &fi
+	}
+
+	mi.oneofs = map[pref.Name]*oneofInfo{}
+	for i := 0; i < md.Oneofs().Len(); i++ {
+		od := md.Oneofs().Get(i)
+		mi.oneofs[od.Name()] = makeOneofInfo(od, si, mi.Exporter)
+	}
+
+	mi.denseFields = make([]*fieldInfo, fds.Len()*2)
+	for i := 0; i < fds.Len(); i++ {
+		if fd := fds.Get(i); int(fd.Number()) < len(mi.denseFields) {
+			mi.denseFields[fd.Number()] = mi.fields[fd.Number()]
+		}
+	}
+
+	for i := 0; i < fds.Len(); {
+		fd := fds.Get(i)
+		if od := fd.ContainingOneof(); od != nil && !od.IsSynthetic() {
+			mi.rangeInfos = append(mi.rangeInfos, mi.oneofs[od.Name()])
+			i += od.Fields().Len()
+		} else {
+			mi.rangeInfos = append(mi.rangeInfos, mi.fields[fd.Number()])
+			i++
+		}
+	}
+}
+
+func (mi *MessageInfo) makeUnknownFieldsFunc(t reflect.Type, si structInfo) {
+	mi.getUnknown = func(pointer) pref.RawFields { return nil }
+	mi.setUnknown = func(pointer, pref.RawFields) { return }
+	if si.unknownOffset.IsValid() {
+		mi.getUnknown = func(p pointer) pref.RawFields {
+			if p.IsNil() {
+				return nil
+			}
+			rv := p.Apply(si.unknownOffset).AsValueOf(unknownFieldsType)
+			return pref.RawFields(*rv.Interface().(*[]byte))
+		}
+		mi.setUnknown = func(p pointer, b pref.RawFields) {
+			if p.IsNil() {
+				panic("invalid SetUnknown on nil Message")
+			}
+			rv := p.Apply(si.unknownOffset).AsValueOf(unknownFieldsType)
+			*rv.Interface().(*[]byte) = []byte(b)
+		}
+	} else {
+		mi.getUnknown = func(pointer) pref.RawFields {
+			return nil
+		}
+		mi.setUnknown = func(p pointer, _ pref.RawFields) {
+			if p.IsNil() {
+				panic("invalid SetUnknown on nil Message")
+			}
+		}
+	}
+}
+
+func (mi *MessageInfo) makeExtensionFieldsFunc(t reflect.Type, si structInfo) {
+	if si.extensionOffset.IsValid() {
+		mi.extensionMap = func(p pointer) *extensionMap {
+			if p.IsNil() {
+				return (*extensionMap)(nil)
+			}
+			v := p.Apply(si.extensionOffset).AsValueOf(extensionFieldsType)
+			return (*extensionMap)(v.Interface().(*map[int32]ExtensionField))
+		}
+	} else {
+		mi.extensionMap = func(pointer) *extensionMap {
+			return (*extensionMap)(nil)
+		}
+	}
+}
+
+type extensionMap map[int32]ExtensionField
+
+func (m *extensionMap) Range(f func(pref.FieldDescriptor, pref.Value) bool) {
+	if m != nil {
+		for _, x := range *m {
+			xd := x.Type().TypeDescriptor()
+			v := x.Value()
+			if xd.IsList() && v.List().Len() == 0 {
+				continue
+			}
+			if !f(xd, v) {
+				return
+			}
+		}
+	}
+}
+func (m *extensionMap) Has(xt pref.ExtensionType) (ok bool) {
+	if m == nil {
+		return false
+	}
+	xd := xt.TypeDescriptor()
+	x, ok := (*m)[int32(xd.Number())]
+	if !ok {
+		return false
+	}
+	switch {
+	case xd.IsList():
+		return x.Value().List().Len() > 0
+	case xd.IsMap():
+		return x.Value().Map().Len() > 0
+	case xd.Message() != nil:
+		return x.Value().Message().IsValid()
+	}
+	return true
+}
+func (m *extensionMap) Clear(xt pref.ExtensionType) {
+	delete(*m, int32(xt.TypeDescriptor().Number()))
+}
+func (m *extensionMap) Get(xt pref.ExtensionType) pref.Value {
+	xd := xt.TypeDescriptor()
+	if m != nil {
+		if x, ok := (*m)[int32(xd.Number())]; ok {
+			return x.Value()
+		}
+	}
+	return xt.Zero()
+}
+func (m *extensionMap) Set(xt pref.ExtensionType, v pref.Value) {
+	xd := xt.TypeDescriptor()
+	isValid := true
+	switch {
+	case !xt.IsValidValue(v):
+		isValid = false
+	case xd.IsList():
+		isValid = v.List().IsValid()
+	case xd.IsMap():
+		isValid = v.Map().IsValid()
+	case xd.Message() != nil:
+		isValid = v.Message().IsValid()
+	}
+	if !isValid {
+		panic(fmt.Sprintf("%v: assigning invalid value", xt.TypeDescriptor().FullName()))
+	}
+
+	if *m == nil {
+		*m = make(map[int32]ExtensionField)
+	}
+	var x ExtensionField
+	x.Set(xt, v)
+	(*m)[int32(xd.Number())] = x
+}
+func (m *extensionMap) Mutable(xt pref.ExtensionType) pref.Value {
+	xd := xt.TypeDescriptor()
+	if xd.Kind() != pref.MessageKind && xd.Kind() != pref.GroupKind && !xd.IsList() && !xd.IsMap() {
+		panic("invalid Mutable on field with non-composite type")
+	}
+	if x, ok := (*m)[int32(xd.Number())]; ok {
+		return x.Value()
+	}
+	v := xt.New()
+	m.Set(xt, v)
+	return v
+}
+
+// MessageState is a data structure that is nested as the first field in a
+// concrete message. It provides a way to implement the ProtoReflect method
+// in an allocation-free way without needing to have a shadow Go type generated
+// for every message type. This technique only works using unsafe.
+//
+//
+// Example generated code:
+//
+//	type M struct {
+//		state protoimpl.MessageState
+//
+//		Field1 int32
+//		Field2 string
+//		Field3 *BarMessage
+//		...
+//	}
+//
+//	func (m *M) ProtoReflect() protoreflect.Message {
+//		mi := &file_fizz_buzz_proto_msgInfos[5]
+//		if protoimpl.UnsafeEnabled && m != nil {
+//			ms := protoimpl.X.MessageStateOf(Pointer(m))
+//			if ms.LoadMessageInfo() == nil {
+//				ms.StoreMessageInfo(mi)
+//			}
+//			return ms
+//		}
+//		return mi.MessageOf(m)
+//	}
+//
+// The MessageState type holds a *MessageInfo, which must be atomically set to
+// the message info associated with a given message instance.
+// By unsafely converting a *M into a *MessageState, the MessageState object
+// has access to all the information needed to implement protobuf reflection.
+// It has access to the message info as its first field, and a pointer to the
+// MessageState is identical to a pointer to the concrete message value.
+//
+//
+// Requirements:
+//	• The type M must implement protoreflect.ProtoMessage.
+//	• The address of m must not be nil.
+//	• The address of m and the address of m.state must be equal,
+//	even though they are different Go types.
+type MessageState struct {
+	pragma.NoUnkeyedLiterals
+	pragma.DoNotCompare
+	pragma.DoNotCopy
+
+	atomicMessageInfo *MessageInfo
+}
+
+type messageState MessageState
+
+var (
+	_ pref.Message = (*messageState)(nil)
+	_ unwrapper    = (*messageState)(nil)
+)
+
+// messageDataType is a tuple of a pointer to the message data and
+// a pointer to the message type. It is a generalized way of providing a
+// reflective view over a message instance. The disadvantage of this approach
+// is the need to allocate this tuple of 16B.
+type messageDataType struct {
+	p  pointer
+	mi *MessageInfo
+}
+
+type (
+	messageReflectWrapper messageDataType
+	messageIfaceWrapper   messageDataType
+)
+
+var (
+	_ pref.Message      = (*messageReflectWrapper)(nil)
+	_ unwrapper         = (*messageReflectWrapper)(nil)
+	_ pref.ProtoMessage = (*messageIfaceWrapper)(nil)
+	_ unwrapper         = (*messageIfaceWrapper)(nil)
+)
+
+// MessageOf returns a reflective view over a message. The input must be a
+// pointer to a named Go struct. If the provided type has a ProtoReflect method,
+// it must be implemented by calling this method.
+func (mi *MessageInfo) MessageOf(m interface{}) pref.Message {
+	// TODO: Switch the input to be an opaque Pointer.
+	if reflect.TypeOf(m) != mi.GoReflectType {
+		panic(fmt.Sprintf("type mismatch: got %T, want %v", m, mi.GoReflectType))
+	}
+	p := pointerOfIface(m)
+	if p.IsNil() {
+		return mi.nilMessage.Init(mi)
+	}
+	return &messageReflectWrapper{p, mi}
+}
+
+func (m *messageReflectWrapper) pointer() pointer          { return m.p }
+func (m *messageReflectWrapper) messageInfo() *MessageInfo { return m.mi }
+
+func (m *messageIfaceWrapper) ProtoReflect() pref.Message {
+	return (*messageReflectWrapper)(m)
+}
+func (m *messageIfaceWrapper) protoUnwrap() interface{} {
+	return m.p.AsIfaceOf(m.mi.GoReflectType.Elem())
+}
+
+// checkField verifies that the provided field descriptor is valid.
+// Exactly one of the returned values is populated.
+func (mi *MessageInfo) checkField(fd pref.FieldDescriptor) (*fieldInfo, pref.ExtensionType) {
+	var fi *fieldInfo
+	if n := fd.Number(); 0 < n && int(n) < len(mi.denseFields) {
+		fi = mi.denseFields[n]
+	} else {
+		fi = mi.fields[n]
+	}
+	if fi != nil {
+		if fi.fieldDesc != fd {
+			if got, want := fd.FullName(), fi.fieldDesc.FullName(); got != want {
+				panic(fmt.Sprintf("mismatching field: got %v, want %v", got, want))
+			}
+			panic(fmt.Sprintf("mismatching field: %v", fd.FullName()))
+		}
+		return fi, nil
+	}
+
+	if fd.IsExtension() {
+		if got, want := fd.ContainingMessage().FullName(), mi.Desc.FullName(); got != want {
+			// TODO: Should this be exact containing message descriptor match?
+			panic(fmt.Sprintf("extension %v has mismatching containing message: got %v, want %v", fd.FullName(), got, want))
+		}
+		if !mi.Desc.ExtensionRanges().Has(fd.Number()) {
+			panic(fmt.Sprintf("extension %v extends %v outside the extension range", fd.FullName(), mi.Desc.FullName()))
+		}
+		xtd, ok := fd.(pref.ExtensionTypeDescriptor)
+		if !ok {
+			panic(fmt.Sprintf("extension %v does not implement protoreflect.ExtensionTypeDescriptor", fd.FullName()))
+		}
+		return nil, xtd.Type()
+	}
+	panic(fmt.Sprintf("field %v is invalid", fd.FullName()))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/message_reflect_field.go b/vendor/google.golang.org/protobuf/internal/impl/message_reflect_field.go
new file mode 100644
index 0000000..23124a8
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/message_reflect_field.go
@@ -0,0 +1,466 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"math"
+	"reflect"
+	"sync"
+
+	"google.golang.org/protobuf/internal/flags"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+type fieldInfo struct {
+	fieldDesc pref.FieldDescriptor
+
+	// These fields are used for protobuf reflection support.
+	has        func(pointer) bool
+	clear      func(pointer)
+	get        func(pointer) pref.Value
+	set        func(pointer, pref.Value)
+	mutable    func(pointer) pref.Value
+	newMessage func() pref.Message
+	newField   func() pref.Value
+}
+
+func fieldInfoForOneof(fd pref.FieldDescriptor, fs reflect.StructField, x exporter, ot reflect.Type) fieldInfo {
+	ft := fs.Type
+	if ft.Kind() != reflect.Interface {
+		panic(fmt.Sprintf("field %v has invalid type: got %v, want interface kind", fd.FullName(), ft))
+	}
+	if ot.Kind() != reflect.Struct {
+		panic(fmt.Sprintf("field %v has invalid type: got %v, want struct kind", fd.FullName(), ot))
+	}
+	if !reflect.PtrTo(ot).Implements(ft) {
+		panic(fmt.Sprintf("field %v has invalid type: %v does not implement %v", fd.FullName(), ot, ft))
+	}
+	conv := NewConverter(ot.Field(0).Type, fd)
+	isMessage := fd.Message() != nil
+
+	// TODO: Implement unsafe fast path?
+	fieldOffset := offsetOf(fs, x)
+	return fieldInfo{
+		// NOTE: The logic below intentionally assumes that oneof fields are
+		// well-formatted. That is, the oneof interface never contains a
+		// typed nil pointer to one of the wrapper structs.
+
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() || rv.Elem().Type().Elem() != ot || rv.Elem().IsNil() {
+				return false
+			}
+			return true
+		},
+		clear: func(p pointer) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() || rv.Elem().Type().Elem() != ot {
+				// NOTE: We intentionally don't check for rv.Elem().IsNil()
+				// so that (*OneofWrapperType)(nil) gets cleared to nil.
+				return
+			}
+			rv.Set(reflect.Zero(rv.Type()))
+		},
+		get: func(p pointer) pref.Value {
+			if p.IsNil() {
+				return conv.Zero()
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() || rv.Elem().Type().Elem() != ot || rv.Elem().IsNil() {
+				return conv.Zero()
+			}
+			rv = rv.Elem().Elem().Field(0)
+			return conv.PBValueOf(rv)
+		},
+		set: func(p pointer, v pref.Value) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() || rv.Elem().Type().Elem() != ot || rv.Elem().IsNil() {
+				rv.Set(reflect.New(ot))
+			}
+			rv = rv.Elem().Elem().Field(0)
+			rv.Set(conv.GoValueOf(v))
+		},
+		mutable: func(p pointer) pref.Value {
+			if !isMessage {
+				panic(fmt.Sprintf("field %v with invalid Mutable call on field with non-composite type", fd.FullName()))
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() || rv.Elem().Type().Elem() != ot || rv.Elem().IsNil() {
+				rv.Set(reflect.New(ot))
+			}
+			rv = rv.Elem().Elem().Field(0)
+			if rv.IsNil() {
+				rv.Set(conv.GoValueOf(pref.ValueOfMessage(conv.New().Message())))
+			}
+			return conv.PBValueOf(rv)
+		},
+		newMessage: func() pref.Message {
+			return conv.New().Message()
+		},
+		newField: func() pref.Value {
+			return conv.New()
+		},
+	}
+}
+
+func fieldInfoForMap(fd pref.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
+	ft := fs.Type
+	if ft.Kind() != reflect.Map {
+		panic(fmt.Sprintf("field %v has invalid type: got %v, want map kind", fd.FullName(), ft))
+	}
+	conv := NewConverter(ft, fd)
+
+	// TODO: Implement unsafe fast path?
+	fieldOffset := offsetOf(fs, x)
+	return fieldInfo{
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			return rv.Len() > 0
+		},
+		clear: func(p pointer) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			rv.Set(reflect.Zero(rv.Type()))
+		},
+		get: func(p pointer) pref.Value {
+			if p.IsNil() {
+				return conv.Zero()
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.Len() == 0 {
+				return conv.Zero()
+			}
+			return conv.PBValueOf(rv)
+		},
+		set: func(p pointer, v pref.Value) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			pv := conv.GoValueOf(v)
+			if pv.IsNil() {
+				panic(fmt.Sprintf("map field %v cannot be set with read-only value", fd.FullName()))
+			}
+			rv.Set(pv)
+		},
+		mutable: func(p pointer) pref.Value {
+			v := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if v.IsNil() {
+				v.Set(reflect.MakeMap(fs.Type))
+			}
+			return conv.PBValueOf(v)
+		},
+		newField: func() pref.Value {
+			return conv.New()
+		},
+	}
+}
+
+func fieldInfoForList(fd pref.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
+	ft := fs.Type
+	if ft.Kind() != reflect.Slice {
+		panic(fmt.Sprintf("field %v has invalid type: got %v, want slice kind", fd.FullName(), ft))
+	}
+	conv := NewConverter(reflect.PtrTo(ft), fd)
+
+	// TODO: Implement unsafe fast path?
+	fieldOffset := offsetOf(fs, x)
+	return fieldInfo{
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			return rv.Len() > 0
+		},
+		clear: func(p pointer) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			rv.Set(reflect.Zero(rv.Type()))
+		},
+		get: func(p pointer) pref.Value {
+			if p.IsNil() {
+				return conv.Zero()
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type)
+			if rv.Elem().Len() == 0 {
+				return conv.Zero()
+			}
+			return conv.PBValueOf(rv)
+		},
+		set: func(p pointer, v pref.Value) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			pv := conv.GoValueOf(v)
+			if pv.IsNil() {
+				panic(fmt.Sprintf("list field %v cannot be set with read-only value", fd.FullName()))
+			}
+			rv.Set(pv.Elem())
+		},
+		mutable: func(p pointer) pref.Value {
+			v := p.Apply(fieldOffset).AsValueOf(fs.Type)
+			return conv.PBValueOf(v)
+		},
+		newField: func() pref.Value {
+			return conv.New()
+		},
+	}
+}
+
+var (
+	nilBytes   = reflect.ValueOf([]byte(nil))
+	emptyBytes = reflect.ValueOf([]byte{})
+)
+
+func fieldInfoForScalar(fd pref.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
+	ft := fs.Type
+	nullable := fd.HasPresence()
+	isBytes := ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8
+	if nullable {
+		if ft.Kind() != reflect.Ptr && ft.Kind() != reflect.Slice {
+			panic(fmt.Sprintf("field %v has invalid type: got %v, want pointer", fd.FullName(), ft))
+		}
+		if ft.Kind() == reflect.Ptr {
+			ft = ft.Elem()
+		}
+	}
+	conv := NewConverter(ft, fd)
+
+	// TODO: Implement unsafe fast path?
+	fieldOffset := offsetOf(fs, x)
+	return fieldInfo{
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if nullable {
+				return !rv.IsNil()
+			}
+			switch rv.Kind() {
+			case reflect.Bool:
+				return rv.Bool()
+			case reflect.Int32, reflect.Int64:
+				return rv.Int() != 0
+			case reflect.Uint32, reflect.Uint64:
+				return rv.Uint() != 0
+			case reflect.Float32, reflect.Float64:
+				return rv.Float() != 0 || math.Signbit(rv.Float())
+			case reflect.String, reflect.Slice:
+				return rv.Len() > 0
+			default:
+				panic(fmt.Sprintf("field %v has invalid type: %v", fd.FullName(), rv.Type())) // should never happen
+			}
+		},
+		clear: func(p pointer) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			rv.Set(reflect.Zero(rv.Type()))
+		},
+		get: func(p pointer) pref.Value {
+			if p.IsNil() {
+				return conv.Zero()
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if nullable {
+				if rv.IsNil() {
+					return conv.Zero()
+				}
+				if rv.Kind() == reflect.Ptr {
+					rv = rv.Elem()
+				}
+			}
+			return conv.PBValueOf(rv)
+		},
+		set: func(p pointer, v pref.Value) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if nullable && rv.Kind() == reflect.Ptr {
+				if rv.IsNil() {
+					rv.Set(reflect.New(ft))
+				}
+				rv = rv.Elem()
+			}
+			rv.Set(conv.GoValueOf(v))
+			if isBytes && rv.Len() == 0 {
+				if nullable {
+					rv.Set(emptyBytes) // preserve presence
+				} else {
+					rv.Set(nilBytes) // do not preserve presence
+				}
+			}
+		},
+		newField: func() pref.Value {
+			return conv.New()
+		},
+	}
+}
+
+func fieldInfoForWeakMessage(fd pref.FieldDescriptor, weakOffset offset) fieldInfo {
+	if !flags.ProtoLegacy {
+		panic("no support for proto1 weak fields")
+	}
+
+	var once sync.Once
+	var messageType pref.MessageType
+	lazyInit := func() {
+		once.Do(func() {
+			messageName := fd.Message().FullName()
+			messageType, _ = preg.GlobalTypes.FindMessageByName(messageName)
+			if messageType == nil {
+				panic(fmt.Sprintf("weak message %v for field %v is not linked in", messageName, fd.FullName()))
+			}
+		})
+	}
+
+	num := fd.Number()
+	return fieldInfo{
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			_, ok := p.Apply(weakOffset).WeakFields().get(num)
+			return ok
+		},
+		clear: func(p pointer) {
+			p.Apply(weakOffset).WeakFields().clear(num)
+		},
+		get: func(p pointer) pref.Value {
+			lazyInit()
+			if p.IsNil() {
+				return pref.ValueOfMessage(messageType.Zero())
+			}
+			m, ok := p.Apply(weakOffset).WeakFields().get(num)
+			if !ok {
+				return pref.ValueOfMessage(messageType.Zero())
+			}
+			return pref.ValueOfMessage(m.ProtoReflect())
+		},
+		set: func(p pointer, v pref.Value) {
+			lazyInit()
+			m := v.Message()
+			if m.Descriptor() != messageType.Descriptor() {
+				if got, want := m.Descriptor().FullName(), messageType.Descriptor().FullName(); got != want {
+					panic(fmt.Sprintf("field %v has mismatching message descriptor: got %v, want %v", fd.FullName(), got, want))
+				}
+				panic(fmt.Sprintf("field %v has mismatching message descriptor: %v", fd.FullName(), m.Descriptor().FullName()))
+			}
+			p.Apply(weakOffset).WeakFields().set(num, m.Interface())
+		},
+		mutable: func(p pointer) pref.Value {
+			lazyInit()
+			fs := p.Apply(weakOffset).WeakFields()
+			m, ok := fs.get(num)
+			if !ok {
+				m = messageType.New().Interface()
+				fs.set(num, m)
+			}
+			return pref.ValueOfMessage(m.ProtoReflect())
+		},
+		newMessage: func() pref.Message {
+			lazyInit()
+			return messageType.New()
+		},
+		newField: func() pref.Value {
+			lazyInit()
+			return pref.ValueOfMessage(messageType.New())
+		},
+	}
+}
+
+func fieldInfoForMessage(fd pref.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
+	ft := fs.Type
+	conv := NewConverter(ft, fd)
+
+	// TODO: Implement unsafe fast path?
+	fieldOffset := offsetOf(fs, x)
+	return fieldInfo{
+		fieldDesc: fd,
+		has: func(p pointer) bool {
+			if p.IsNil() {
+				return false
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			return !rv.IsNil()
+		},
+		clear: func(p pointer) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			rv.Set(reflect.Zero(rv.Type()))
+		},
+		get: func(p pointer) pref.Value {
+			if p.IsNil() {
+				return conv.Zero()
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			return conv.PBValueOf(rv)
+		},
+		set: func(p pointer, v pref.Value) {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			rv.Set(conv.GoValueOf(v))
+			if rv.IsNil() {
+				panic(fmt.Sprintf("field %v has invalid nil pointer", fd.FullName()))
+			}
+		},
+		mutable: func(p pointer) pref.Value {
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() {
+				rv.Set(conv.GoValueOf(conv.New()))
+			}
+			return conv.PBValueOf(rv)
+		},
+		newMessage: func() pref.Message {
+			return conv.New().Message()
+		},
+		newField: func() pref.Value {
+			return conv.New()
+		},
+	}
+}
+
+type oneofInfo struct {
+	oneofDesc pref.OneofDescriptor
+	which     func(pointer) pref.FieldNumber
+}
+
+func makeOneofInfo(od pref.OneofDescriptor, si structInfo, x exporter) *oneofInfo {
+	oi := &oneofInfo{oneofDesc: od}
+	if od.IsSynthetic() {
+		fs := si.fieldsByNumber[od.Fields().Get(0).Number()]
+		fieldOffset := offsetOf(fs, x)
+		oi.which = func(p pointer) pref.FieldNumber {
+			if p.IsNil() {
+				return 0
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() { // valid on either *T or []byte
+				return 0
+			}
+			return od.Fields().Get(0).Number()
+		}
+	} else {
+		fs := si.oneofsByName[od.Name()]
+		fieldOffset := offsetOf(fs, x)
+		oi.which = func(p pointer) pref.FieldNumber {
+			if p.IsNil() {
+				return 0
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() {
+				return 0
+			}
+			rv = rv.Elem()
+			if rv.IsNil() {
+				return 0
+			}
+			return si.oneofWrappersByType[rv.Type().Elem()]
+		}
+	}
+	return oi
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/message_reflect_gen.go b/vendor/google.golang.org/protobuf/internal/impl/message_reflect_gen.go
new file mode 100644
index 0000000..741d6e5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/message_reflect_gen.go
@@ -0,0 +1,249 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package impl
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+func (m *messageState) Descriptor() protoreflect.MessageDescriptor {
+	return m.messageInfo().Desc
+}
+func (m *messageState) Type() protoreflect.MessageType {
+	return m.messageInfo()
+}
+func (m *messageState) New() protoreflect.Message {
+	return m.messageInfo().New()
+}
+func (m *messageState) Interface() protoreflect.ProtoMessage {
+	return m.protoUnwrap().(protoreflect.ProtoMessage)
+}
+func (m *messageState) protoUnwrap() interface{} {
+	return m.pointer().AsIfaceOf(m.messageInfo().GoReflectType.Elem())
+}
+func (m *messageState) ProtoMethods() *protoiface.Methods {
+	m.messageInfo().init()
+	return &m.messageInfo().methods
+}
+
+// ProtoMessageInfo is a pseudo-internal API for allowing the v1 code
+// to be able to retrieve a v2 MessageInfo struct.
+//
+// WARNING: This method is exempt from the compatibility promise and
+// may be removed in the future without warning.
+func (m *messageState) ProtoMessageInfo() *MessageInfo {
+	return m.messageInfo()
+}
+
+func (m *messageState) Range(f func(protoreflect.FieldDescriptor, protoreflect.Value) bool) {
+	m.messageInfo().init()
+	for _, ri := range m.messageInfo().rangeInfos {
+		switch ri := ri.(type) {
+		case *fieldInfo:
+			if ri.has(m.pointer()) {
+				if !f(ri.fieldDesc, ri.get(m.pointer())) {
+					return
+				}
+			}
+		case *oneofInfo:
+			if n := ri.which(m.pointer()); n > 0 {
+				fi := m.messageInfo().fields[n]
+				if !f(fi.fieldDesc, fi.get(m.pointer())) {
+					return
+				}
+			}
+		}
+	}
+	m.messageInfo().extensionMap(m.pointer()).Range(f)
+}
+func (m *messageState) Has(fd protoreflect.FieldDescriptor) bool {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.has(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Has(xt)
+	}
+}
+func (m *messageState) Clear(fd protoreflect.FieldDescriptor) {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		fi.clear(m.pointer())
+	} else {
+		m.messageInfo().extensionMap(m.pointer()).Clear(xt)
+	}
+}
+func (m *messageState) Get(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.get(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Get(xt)
+	}
+}
+func (m *messageState) Set(fd protoreflect.FieldDescriptor, v protoreflect.Value) {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		fi.set(m.pointer(), v)
+	} else {
+		m.messageInfo().extensionMap(m.pointer()).Set(xt, v)
+	}
+}
+func (m *messageState) Mutable(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.mutable(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Mutable(xt)
+	}
+}
+func (m *messageState) NewField(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.newField()
+	} else {
+		return xt.New()
+	}
+}
+func (m *messageState) WhichOneof(od protoreflect.OneofDescriptor) protoreflect.FieldDescriptor {
+	m.messageInfo().init()
+	if oi := m.messageInfo().oneofs[od.Name()]; oi != nil && oi.oneofDesc == od {
+		return od.Fields().ByNumber(oi.which(m.pointer()))
+	}
+	panic("invalid oneof descriptor " + string(od.FullName()) + " for message " + string(m.Descriptor().FullName()))
+}
+func (m *messageState) GetUnknown() protoreflect.RawFields {
+	m.messageInfo().init()
+	return m.messageInfo().getUnknown(m.pointer())
+}
+func (m *messageState) SetUnknown(b protoreflect.RawFields) {
+	m.messageInfo().init()
+	m.messageInfo().setUnknown(m.pointer(), b)
+}
+func (m *messageState) IsValid() bool {
+	return !m.pointer().IsNil()
+}
+
+func (m *messageReflectWrapper) Descriptor() protoreflect.MessageDescriptor {
+	return m.messageInfo().Desc
+}
+func (m *messageReflectWrapper) Type() protoreflect.MessageType {
+	return m.messageInfo()
+}
+func (m *messageReflectWrapper) New() protoreflect.Message {
+	return m.messageInfo().New()
+}
+func (m *messageReflectWrapper) Interface() protoreflect.ProtoMessage {
+	if m, ok := m.protoUnwrap().(protoreflect.ProtoMessage); ok {
+		return m
+	}
+	return (*messageIfaceWrapper)(m)
+}
+func (m *messageReflectWrapper) protoUnwrap() interface{} {
+	return m.pointer().AsIfaceOf(m.messageInfo().GoReflectType.Elem())
+}
+func (m *messageReflectWrapper) ProtoMethods() *protoiface.Methods {
+	m.messageInfo().init()
+	return &m.messageInfo().methods
+}
+
+// ProtoMessageInfo is a pseudo-internal API for allowing the v1 code
+// to be able to retrieve a v2 MessageInfo struct.
+//
+// WARNING: This method is exempt from the compatibility promise and
+// may be removed in the future without warning.
+func (m *messageReflectWrapper) ProtoMessageInfo() *MessageInfo {
+	return m.messageInfo()
+}
+
+func (m *messageReflectWrapper) Range(f func(protoreflect.FieldDescriptor, protoreflect.Value) bool) {
+	m.messageInfo().init()
+	for _, ri := range m.messageInfo().rangeInfos {
+		switch ri := ri.(type) {
+		case *fieldInfo:
+			if ri.has(m.pointer()) {
+				if !f(ri.fieldDesc, ri.get(m.pointer())) {
+					return
+				}
+			}
+		case *oneofInfo:
+			if n := ri.which(m.pointer()); n > 0 {
+				fi := m.messageInfo().fields[n]
+				if !f(fi.fieldDesc, fi.get(m.pointer())) {
+					return
+				}
+			}
+		}
+	}
+	m.messageInfo().extensionMap(m.pointer()).Range(f)
+}
+func (m *messageReflectWrapper) Has(fd protoreflect.FieldDescriptor) bool {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.has(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Has(xt)
+	}
+}
+func (m *messageReflectWrapper) Clear(fd protoreflect.FieldDescriptor) {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		fi.clear(m.pointer())
+	} else {
+		m.messageInfo().extensionMap(m.pointer()).Clear(xt)
+	}
+}
+func (m *messageReflectWrapper) Get(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.get(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Get(xt)
+	}
+}
+func (m *messageReflectWrapper) Set(fd protoreflect.FieldDescriptor, v protoreflect.Value) {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		fi.set(m.pointer(), v)
+	} else {
+		m.messageInfo().extensionMap(m.pointer()).Set(xt, v)
+	}
+}
+func (m *messageReflectWrapper) Mutable(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.mutable(m.pointer())
+	} else {
+		return m.messageInfo().extensionMap(m.pointer()).Mutable(xt)
+	}
+}
+func (m *messageReflectWrapper) NewField(fd protoreflect.FieldDescriptor) protoreflect.Value {
+	m.messageInfo().init()
+	if fi, xt := m.messageInfo().checkField(fd); fi != nil {
+		return fi.newField()
+	} else {
+		return xt.New()
+	}
+}
+func (m *messageReflectWrapper) WhichOneof(od protoreflect.OneofDescriptor) protoreflect.FieldDescriptor {
+	m.messageInfo().init()
+	if oi := m.messageInfo().oneofs[od.Name()]; oi != nil && oi.oneofDesc == od {
+		return od.Fields().ByNumber(oi.which(m.pointer()))
+	}
+	panic("invalid oneof descriptor " + string(od.FullName()) + " for message " + string(m.Descriptor().FullName()))
+}
+func (m *messageReflectWrapper) GetUnknown() protoreflect.RawFields {
+	m.messageInfo().init()
+	return m.messageInfo().getUnknown(m.pointer())
+}
+func (m *messageReflectWrapper) SetUnknown(b protoreflect.RawFields) {
+	m.messageInfo().init()
+	m.messageInfo().setUnknown(m.pointer(), b)
+}
+func (m *messageReflectWrapper) IsValid() bool {
+	return !m.pointer().IsNil()
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go b/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go
new file mode 100644
index 0000000..67b4ede
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go
@@ -0,0 +1,177 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build purego appengine
+
+package impl
+
+import (
+	"fmt"
+	"reflect"
+	"sync"
+)
+
+const UnsafeEnabled = false
+
+// Pointer is an opaque pointer type.
+type Pointer interface{}
+
+// offset represents the offset to a struct field, accessible from a pointer.
+// The offset is the field index into a struct.
+type offset struct {
+	index  int
+	export exporter
+}
+
+// offsetOf returns a field offset for the struct field.
+func offsetOf(f reflect.StructField, x exporter) offset {
+	if len(f.Index) != 1 {
+		panic("embedded structs are not supported")
+	}
+	if f.PkgPath == "" {
+		return offset{index: f.Index[0]} // field is already exported
+	}
+	if x == nil {
+		panic("exporter must be provided for unexported field")
+	}
+	return offset{index: f.Index[0], export: x}
+}
+
+// IsValid reports whether the offset is valid.
+func (f offset) IsValid() bool { return f.index >= 0 }
+
+// invalidOffset is an invalid field offset.
+var invalidOffset = offset{index: -1}
+
+// zeroOffset is a noop when calling pointer.Apply.
+var zeroOffset = offset{index: 0}
+
+// pointer is an abstract representation of a pointer to a struct or field.
+type pointer struct{ v reflect.Value }
+
+// pointerOf returns p as a pointer.
+func pointerOf(p Pointer) pointer {
+	return pointerOfIface(p)
+}
+
+// pointerOfValue returns v as a pointer.
+func pointerOfValue(v reflect.Value) pointer {
+	return pointer{v: v}
+}
+
+// pointerOfIface returns the pointer portion of an interface.
+func pointerOfIface(v interface{}) pointer {
+	return pointer{v: reflect.ValueOf(v)}
+}
+
+// IsNil reports whether the pointer is nil.
+func (p pointer) IsNil() bool {
+	return p.v.IsNil()
+}
+
+// Apply adds an offset to the pointer to derive a new pointer
+// to a specified field. The current pointer must be pointing at a struct.
+func (p pointer) Apply(f offset) pointer {
+	if f.export != nil {
+		if v := reflect.ValueOf(f.export(p.v.Interface(), f.index)); v.IsValid() {
+			return pointer{v: v}
+		}
+	}
+	return pointer{v: p.v.Elem().Field(f.index).Addr()}
+}
+
+// AsValueOf treats p as a pointer to an object of type t and returns the value.
+// It is equivalent to reflect.ValueOf(p.AsIfaceOf(t))
+func (p pointer) AsValueOf(t reflect.Type) reflect.Value {
+	if got := p.v.Type().Elem(); got != t {
+		panic(fmt.Sprintf("invalid type: got %v, want %v", got, t))
+	}
+	return p.v
+}
+
+// AsIfaceOf treats p as a pointer to an object of type t and returns the value.
+// It is equivalent to p.AsValueOf(t).Interface()
+func (p pointer) AsIfaceOf(t reflect.Type) interface{} {
+	return p.AsValueOf(t).Interface()
+}
+
+func (p pointer) Bool() *bool              { return p.v.Interface().(*bool) }
+func (p pointer) BoolPtr() **bool          { return p.v.Interface().(**bool) }
+func (p pointer) BoolSlice() *[]bool       { return p.v.Interface().(*[]bool) }
+func (p pointer) Int32() *int32            { return p.v.Interface().(*int32) }
+func (p pointer) Int32Ptr() **int32        { return p.v.Interface().(**int32) }
+func (p pointer) Int32Slice() *[]int32     { return p.v.Interface().(*[]int32) }
+func (p pointer) Int64() *int64            { return p.v.Interface().(*int64) }
+func (p pointer) Int64Ptr() **int64        { return p.v.Interface().(**int64) }
+func (p pointer) Int64Slice() *[]int64     { return p.v.Interface().(*[]int64) }
+func (p pointer) Uint32() *uint32          { return p.v.Interface().(*uint32) }
+func (p pointer) Uint32Ptr() **uint32      { return p.v.Interface().(**uint32) }
+func (p pointer) Uint32Slice() *[]uint32   { return p.v.Interface().(*[]uint32) }
+func (p pointer) Uint64() *uint64          { return p.v.Interface().(*uint64) }
+func (p pointer) Uint64Ptr() **uint64      { return p.v.Interface().(**uint64) }
+func (p pointer) Uint64Slice() *[]uint64   { return p.v.Interface().(*[]uint64) }
+func (p pointer) Float32() *float32        { return p.v.Interface().(*float32) }
+func (p pointer) Float32Ptr() **float32    { return p.v.Interface().(**float32) }
+func (p pointer) Float32Slice() *[]float32 { return p.v.Interface().(*[]float32) }
+func (p pointer) Float64() *float64        { return p.v.Interface().(*float64) }
+func (p pointer) Float64Ptr() **float64    { return p.v.Interface().(**float64) }
+func (p pointer) Float64Slice() *[]float64 { return p.v.Interface().(*[]float64) }
+func (p pointer) String() *string          { return p.v.Interface().(*string) }
+func (p pointer) StringPtr() **string      { return p.v.Interface().(**string) }
+func (p pointer) StringSlice() *[]string   { return p.v.Interface().(*[]string) }
+func (p pointer) Bytes() *[]byte           { return p.v.Interface().(*[]byte) }
+func (p pointer) BytesSlice() *[][]byte    { return p.v.Interface().(*[][]byte) }
+func (p pointer) WeakFields() *weakFields  { return (*weakFields)(p.v.Interface().(*WeakFields)) }
+func (p pointer) Extensions() *map[int32]ExtensionField {
+	return p.v.Interface().(*map[int32]ExtensionField)
+}
+
+func (p pointer) Elem() pointer {
+	return pointer{v: p.v.Elem()}
+}
+
+// PointerSlice copies []*T from p as a new []pointer.
+// This behavior differs from the implementation in pointer_unsafe.go.
+func (p pointer) PointerSlice() []pointer {
+	// TODO: reconsider this
+	if p.v.IsNil() {
+		return nil
+	}
+	n := p.v.Elem().Len()
+	s := make([]pointer, n)
+	for i := 0; i < n; i++ {
+		s[i] = pointer{v: p.v.Elem().Index(i)}
+	}
+	return s
+}
+
+// AppendPointerSlice appends v to p, which must be a []*T.
+func (p pointer) AppendPointerSlice(v pointer) {
+	sp := p.v.Elem()
+	sp.Set(reflect.Append(sp, v.v))
+}
+
+// SetPointer sets *p to v.
+func (p pointer) SetPointer(v pointer) {
+	p.v.Elem().Set(v.v)
+}
+
+func (Export) MessageStateOf(p Pointer) *messageState     { panic("not supported") }
+func (ms *messageState) pointer() pointer                 { panic("not supported") }
+func (ms *messageState) messageInfo() *MessageInfo        { panic("not supported") }
+func (ms *messageState) LoadMessageInfo() *MessageInfo    { panic("not supported") }
+func (ms *messageState) StoreMessageInfo(mi *MessageInfo) { panic("not supported") }
+
+type atomicNilMessage struct {
+	once sync.Once
+	m    messageReflectWrapper
+}
+
+func (m *atomicNilMessage) Init(mi *MessageInfo) *messageReflectWrapper {
+	m.once.Do(func() {
+		m.m.p = pointerOfIface(reflect.Zero(mi.GoReflectType).Interface())
+		m.m.mi = mi
+	})
+	return &m.m
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/pointer_unsafe.go b/vendor/google.golang.org/protobuf/internal/impl/pointer_unsafe.go
new file mode 100644
index 0000000..088aa85
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/pointer_unsafe.go
@@ -0,0 +1,173 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !purego,!appengine
+
+package impl
+
+import (
+	"reflect"
+	"sync/atomic"
+	"unsafe"
+)
+
+const UnsafeEnabled = true
+
+// Pointer is an opaque pointer type.
+type Pointer unsafe.Pointer
+
+// offset represents the offset to a struct field, accessible from a pointer.
+// The offset is the byte offset to the field from the start of the struct.
+type offset uintptr
+
+// offsetOf returns a field offset for the struct field.
+func offsetOf(f reflect.StructField, x exporter) offset {
+	return offset(f.Offset)
+}
+
+// IsValid reports whether the offset is valid.
+func (f offset) IsValid() bool { return f != invalidOffset }
+
+// invalidOffset is an invalid field offset.
+var invalidOffset = ^offset(0)
+
+// zeroOffset is a noop when calling pointer.Apply.
+var zeroOffset = offset(0)
+
+// pointer is a pointer to a message struct or field.
+type pointer struct{ p unsafe.Pointer }
+
+// pointerOf returns p as a pointer.
+func pointerOf(p Pointer) pointer {
+	return pointer{p: unsafe.Pointer(p)}
+}
+
+// pointerOfValue returns v as a pointer.
+func pointerOfValue(v reflect.Value) pointer {
+	return pointer{p: unsafe.Pointer(v.Pointer())}
+}
+
+// pointerOfIface returns the pointer portion of an interface.
+func pointerOfIface(v interface{}) pointer {
+	type ifaceHeader struct {
+		Type unsafe.Pointer
+		Data unsafe.Pointer
+	}
+	return pointer{p: (*ifaceHeader)(unsafe.Pointer(&v)).Data}
+}
+
+// IsNil reports whether the pointer is nil.
+func (p pointer) IsNil() bool {
+	return p.p == nil
+}
+
+// Apply adds an offset to the pointer to derive a new pointer
+// to a specified field. The pointer must be valid and pointing at a struct.
+func (p pointer) Apply(f offset) pointer {
+	if p.IsNil() {
+		panic("invalid nil pointer")
+	}
+	return pointer{p: unsafe.Pointer(uintptr(p.p) + uintptr(f))}
+}
+
+// AsValueOf treats p as a pointer to an object of type t and returns the value.
+// It is equivalent to reflect.ValueOf(p.AsIfaceOf(t))
+func (p pointer) AsValueOf(t reflect.Type) reflect.Value {
+	return reflect.NewAt(t, p.p)
+}
+
+// AsIfaceOf treats p as a pointer to an object of type t and returns the value.
+// It is equivalent to p.AsValueOf(t).Interface()
+func (p pointer) AsIfaceOf(t reflect.Type) interface{} {
+	// TODO: Use tricky unsafe magic to directly create ifaceHeader.
+	return p.AsValueOf(t).Interface()
+}
+
+func (p pointer) Bool() *bool                           { return (*bool)(p.p) }
+func (p pointer) BoolPtr() **bool                       { return (**bool)(p.p) }
+func (p pointer) BoolSlice() *[]bool                    { return (*[]bool)(p.p) }
+func (p pointer) Int32() *int32                         { return (*int32)(p.p) }
+func (p pointer) Int32Ptr() **int32                     { return (**int32)(p.p) }
+func (p pointer) Int32Slice() *[]int32                  { return (*[]int32)(p.p) }
+func (p pointer) Int64() *int64                         { return (*int64)(p.p) }
+func (p pointer) Int64Ptr() **int64                     { return (**int64)(p.p) }
+func (p pointer) Int64Slice() *[]int64                  { return (*[]int64)(p.p) }
+func (p pointer) Uint32() *uint32                       { return (*uint32)(p.p) }
+func (p pointer) Uint32Ptr() **uint32                   { return (**uint32)(p.p) }
+func (p pointer) Uint32Slice() *[]uint32                { return (*[]uint32)(p.p) }
+func (p pointer) Uint64() *uint64                       { return (*uint64)(p.p) }
+func (p pointer) Uint64Ptr() **uint64                   { return (**uint64)(p.p) }
+func (p pointer) Uint64Slice() *[]uint64                { return (*[]uint64)(p.p) }
+func (p pointer) Float32() *float32                     { return (*float32)(p.p) }
+func (p pointer) Float32Ptr() **float32                 { return (**float32)(p.p) }
+func (p pointer) Float32Slice() *[]float32              { return (*[]float32)(p.p) }
+func (p pointer) Float64() *float64                     { return (*float64)(p.p) }
+func (p pointer) Float64Ptr() **float64                 { return (**float64)(p.p) }
+func (p pointer) Float64Slice() *[]float64              { return (*[]float64)(p.p) }
+func (p pointer) String() *string                       { return (*string)(p.p) }
+func (p pointer) StringPtr() **string                   { return (**string)(p.p) }
+func (p pointer) StringSlice() *[]string                { return (*[]string)(p.p) }
+func (p pointer) Bytes() *[]byte                        { return (*[]byte)(p.p) }
+func (p pointer) BytesSlice() *[][]byte                 { return (*[][]byte)(p.p) }
+func (p pointer) WeakFields() *weakFields               { return (*weakFields)(p.p) }
+func (p pointer) Extensions() *map[int32]ExtensionField { return (*map[int32]ExtensionField)(p.p) }
+
+func (p pointer) Elem() pointer {
+	return pointer{p: *(*unsafe.Pointer)(p.p)}
+}
+
+// PointerSlice loads []*T from p as a []pointer.
+// The value returned is aliased with the original slice.
+// This behavior differs from the implementation in pointer_reflect.go.
+func (p pointer) PointerSlice() []pointer {
+	// Super-tricky - p should point to a []*T where T is a
+	// message type. We load it as []pointer.
+	return *(*[]pointer)(p.p)
+}
+
+// AppendPointerSlice appends v to p, which must be a []*T.
+func (p pointer) AppendPointerSlice(v pointer) {
+	*(*[]pointer)(p.p) = append(*(*[]pointer)(p.p), v)
+}
+
+// SetPointer sets *p to v.
+func (p pointer) SetPointer(v pointer) {
+	*(*unsafe.Pointer)(p.p) = (unsafe.Pointer)(v.p)
+}
+
+// Static check that MessageState does not exceed the size of a pointer.
+const _ = uint(unsafe.Sizeof(unsafe.Pointer(nil)) - unsafe.Sizeof(MessageState{}))
+
+func (Export) MessageStateOf(p Pointer) *messageState {
+	// Super-tricky - see documentation on MessageState.
+	return (*messageState)(unsafe.Pointer(p))
+}
+func (ms *messageState) pointer() pointer {
+	// Super-tricky - see documentation on MessageState.
+	return pointer{p: unsafe.Pointer(ms)}
+}
+func (ms *messageState) messageInfo() *MessageInfo {
+	mi := ms.LoadMessageInfo()
+	if mi == nil {
+		panic("invalid nil message info; this suggests memory corruption due to a race or shallow copy on the message struct")
+	}
+	return mi
+}
+func (ms *messageState) LoadMessageInfo() *MessageInfo {
+	return (*MessageInfo)(atomic.LoadPointer((*unsafe.Pointer)(unsafe.Pointer(&ms.atomicMessageInfo))))
+}
+func (ms *messageState) StoreMessageInfo(mi *MessageInfo) {
+	atomic.StorePointer((*unsafe.Pointer)(unsafe.Pointer(&ms.atomicMessageInfo)), unsafe.Pointer(mi))
+}
+
+type atomicNilMessage struct{ p unsafe.Pointer } // p is a *messageReflectWrapper
+
+func (m *atomicNilMessage) Init(mi *MessageInfo) *messageReflectWrapper {
+	if p := atomic.LoadPointer(&m.p); p != nil {
+		return (*messageReflectWrapper)(p)
+	}
+	w := &messageReflectWrapper{mi: mi}
+	atomic.CompareAndSwapPointer(&m.p, nil, (unsafe.Pointer)(w))
+	return (*messageReflectWrapper)(atomic.LoadPointer(&m.p))
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/validate.go b/vendor/google.golang.org/protobuf/internal/impl/validate.go
new file mode 100644
index 0000000..57de9cc
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/validate.go
@@ -0,0 +1,575 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+	"math"
+	"math/bits"
+	"reflect"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/internal/strs"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
+	piface "google.golang.org/protobuf/runtime/protoiface"
+)
+
+// ValidationStatus is the result of validating the wire-format encoding of a message.
+type ValidationStatus int
+
+const (
+	// ValidationUnknown indicates that unmarshaling the message might succeed or fail.
+	// The validator was unable to render a judgement.
+	//
+	// The only causes of this status are an aberrant message type appearing somewhere
+	// in the message or a failure in the extension resolver.
+	ValidationUnknown ValidationStatus = iota + 1
+
+	// ValidationInvalid indicates that unmarshaling the message will fail.
+	ValidationInvalid
+
+	// ValidationValid indicates that unmarshaling the message will succeed.
+	ValidationValid
+)
+
+func (v ValidationStatus) String() string {
+	switch v {
+	case ValidationUnknown:
+		return "ValidationUnknown"
+	case ValidationInvalid:
+		return "ValidationInvalid"
+	case ValidationValid:
+		return "ValidationValid"
+	default:
+		return fmt.Sprintf("ValidationStatus(%d)", int(v))
+	}
+}
+
+// Validate determines whether the contents of the buffer are a valid wire encoding
+// of the message type.
+//
+// This function is exposed for testing.
+func Validate(mt pref.MessageType, in piface.UnmarshalInput) (out piface.UnmarshalOutput, _ ValidationStatus) {
+	mi, ok := mt.(*MessageInfo)
+	if !ok {
+		return out, ValidationUnknown
+	}
+	if in.Resolver == nil {
+		in.Resolver = preg.GlobalTypes
+	}
+	o, st := mi.validate(in.Buf, 0, unmarshalOptions{
+		flags:    in.Flags,
+		resolver: in.Resolver,
+	})
+	if o.initialized {
+		out.Flags |= piface.UnmarshalInitialized
+	}
+	return out, st
+}
+
+type validationInfo struct {
+	mi               *MessageInfo
+	typ              validationType
+	keyType, valType validationType
+
+	// For non-required fields, requiredBit is 0.
+	//
+	// For required fields, requiredBit's nth bit is set, where n is a
+	// unique index in the range [0, MessageInfo.numRequiredFields).
+	//
+	// If there are more than 64 required fields, requiredBit is 0.
+	requiredBit uint64
+}
+
+type validationType uint8
+
+const (
+	validationTypeOther validationType = iota
+	validationTypeMessage
+	validationTypeGroup
+	validationTypeMap
+	validationTypeRepeatedVarint
+	validationTypeRepeatedFixed32
+	validationTypeRepeatedFixed64
+	validationTypeVarint
+	validationTypeFixed32
+	validationTypeFixed64
+	validationTypeBytes
+	validationTypeUTF8String
+	validationTypeMessageSetItem
+)
+
+func newFieldValidationInfo(mi *MessageInfo, si structInfo, fd pref.FieldDescriptor, ft reflect.Type) validationInfo {
+	var vi validationInfo
+	switch {
+	case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
+		switch fd.Kind() {
+		case pref.MessageKind:
+			vi.typ = validationTypeMessage
+			if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
+				vi.mi = getMessageInfo(ot.Field(0).Type)
+			}
+		case pref.GroupKind:
+			vi.typ = validationTypeGroup
+			if ot, ok := si.oneofWrappersByNumber[fd.Number()]; ok {
+				vi.mi = getMessageInfo(ot.Field(0).Type)
+			}
+		case pref.StringKind:
+			if strs.EnforceUTF8(fd) {
+				vi.typ = validationTypeUTF8String
+			}
+		}
+	default:
+		vi = newValidationInfo(fd, ft)
+	}
+	if fd.Cardinality() == pref.Required {
+		// Avoid overflow. The required field check is done with a 64-bit mask, with
+		// any message containing more than 64 required fields always reported as
+		// potentially uninitialized, so it is not important to get a precise count
+		// of the required fields past 64.
+		if mi.numRequiredFields < math.MaxUint8 {
+			mi.numRequiredFields++
+			vi.requiredBit = 1 << (mi.numRequiredFields - 1)
+		}
+	}
+	return vi
+}
+
+func newValidationInfo(fd pref.FieldDescriptor, ft reflect.Type) validationInfo {
+	var vi validationInfo
+	switch {
+	case fd.IsList():
+		switch fd.Kind() {
+		case pref.MessageKind:
+			vi.typ = validationTypeMessage
+			if ft.Kind() == reflect.Slice {
+				vi.mi = getMessageInfo(ft.Elem())
+			}
+		case pref.GroupKind:
+			vi.typ = validationTypeGroup
+			if ft.Kind() == reflect.Slice {
+				vi.mi = getMessageInfo(ft.Elem())
+			}
+		case pref.StringKind:
+			vi.typ = validationTypeBytes
+			if strs.EnforceUTF8(fd) {
+				vi.typ = validationTypeUTF8String
+			}
+		default:
+			switch wireTypes[fd.Kind()] {
+			case protowire.VarintType:
+				vi.typ = validationTypeRepeatedVarint
+			case protowire.Fixed32Type:
+				vi.typ = validationTypeRepeatedFixed32
+			case protowire.Fixed64Type:
+				vi.typ = validationTypeRepeatedFixed64
+			}
+		}
+	case fd.IsMap():
+		vi.typ = validationTypeMap
+		switch fd.MapKey().Kind() {
+		case pref.StringKind:
+			if strs.EnforceUTF8(fd) {
+				vi.keyType = validationTypeUTF8String
+			}
+		}
+		switch fd.MapValue().Kind() {
+		case pref.MessageKind:
+			vi.valType = validationTypeMessage
+			if ft.Kind() == reflect.Map {
+				vi.mi = getMessageInfo(ft.Elem())
+			}
+		case pref.StringKind:
+			if strs.EnforceUTF8(fd) {
+				vi.valType = validationTypeUTF8String
+			}
+		}
+	default:
+		switch fd.Kind() {
+		case pref.MessageKind:
+			vi.typ = validationTypeMessage
+			if !fd.IsWeak() {
+				vi.mi = getMessageInfo(ft)
+			}
+		case pref.GroupKind:
+			vi.typ = validationTypeGroup
+			vi.mi = getMessageInfo(ft)
+		case pref.StringKind:
+			vi.typ = validationTypeBytes
+			if strs.EnforceUTF8(fd) {
+				vi.typ = validationTypeUTF8String
+			}
+		default:
+			switch wireTypes[fd.Kind()] {
+			case protowire.VarintType:
+				vi.typ = validationTypeVarint
+			case protowire.Fixed32Type:
+				vi.typ = validationTypeFixed32
+			case protowire.Fixed64Type:
+				vi.typ = validationTypeFixed64
+			case protowire.BytesType:
+				vi.typ = validationTypeBytes
+			}
+		}
+	}
+	return vi
+}
+
+func (mi *MessageInfo) validate(b []byte, groupTag protowire.Number, opts unmarshalOptions) (out unmarshalOutput, result ValidationStatus) {
+	mi.init()
+	type validationState struct {
+		typ              validationType
+		keyType, valType validationType
+		endGroup         protowire.Number
+		mi               *MessageInfo
+		tail             []byte
+		requiredMask     uint64
+	}
+
+	// Pre-allocate some slots to avoid repeated slice reallocation.
+	states := make([]validationState, 0, 16)
+	states = append(states, validationState{
+		typ: validationTypeMessage,
+		mi:  mi,
+	})
+	if groupTag > 0 {
+		states[0].typ = validationTypeGroup
+		states[0].endGroup = groupTag
+	}
+	initialized := true
+	start := len(b)
+State:
+	for len(states) > 0 {
+		st := &states[len(states)-1]
+		for len(b) > 0 {
+			// Parse the tag (field number and wire type).
+			var tag uint64
+			if b[0] < 0x80 {
+				tag = uint64(b[0])
+				b = b[1:]
+			} else if len(b) >= 2 && b[1] < 128 {
+				tag = uint64(b[0]&0x7f) + uint64(b[1])<<7
+				b = b[2:]
+			} else {
+				var n int
+				tag, n = protowire.ConsumeVarint(b)
+				if n < 0 {
+					return out, ValidationInvalid
+				}
+				b = b[n:]
+			}
+			var num protowire.Number
+			if n := tag >> 3; n < uint64(protowire.MinValidNumber) || n > uint64(protowire.MaxValidNumber) {
+				return out, ValidationInvalid
+			} else {
+				num = protowire.Number(n)
+			}
+			wtyp := protowire.Type(tag & 7)
+
+			if wtyp == protowire.EndGroupType {
+				if st.endGroup == num {
+					goto PopState
+				}
+				return out, ValidationInvalid
+			}
+			var vi validationInfo
+			switch {
+			case st.typ == validationTypeMap:
+				switch num {
+				case 1:
+					vi.typ = st.keyType
+				case 2:
+					vi.typ = st.valType
+					vi.mi = st.mi
+					vi.requiredBit = 1
+				}
+			case flags.ProtoLegacy && st.mi.isMessageSet:
+				switch num {
+				case messageset.FieldItem:
+					vi.typ = validationTypeMessageSetItem
+				}
+			default:
+				var f *coderFieldInfo
+				if int(num) < len(st.mi.denseCoderFields) {
+					f = st.mi.denseCoderFields[num]
+				} else {
+					f = st.mi.coderFields[num]
+				}
+				if f != nil {
+					vi = f.validation
+					if vi.typ == validationTypeMessage && vi.mi == nil {
+						// Probable weak field.
+						//
+						// TODO: Consider storing the results of this lookup somewhere
+						// rather than recomputing it on every validation.
+						fd := st.mi.Desc.Fields().ByNumber(num)
+						if fd == nil || !fd.IsWeak() {
+							break
+						}
+						messageName := fd.Message().FullName()
+						messageType, err := preg.GlobalTypes.FindMessageByName(messageName)
+						switch err {
+						case nil:
+							vi.mi, _ = messageType.(*MessageInfo)
+						case preg.NotFound:
+							vi.typ = validationTypeBytes
+						default:
+							return out, ValidationUnknown
+						}
+					}
+					break
+				}
+				// Possible extension field.
+				//
+				// TODO: We should return ValidationUnknown when:
+				//   1. The resolver is not frozen. (More extensions may be added to it.)
+				//   2. The resolver returns preg.NotFound.
+				// In this case, a type added to the resolver in the future could cause
+				// unmarshaling to begin failing. Supporting this requires some way to
+				// determine if the resolver is frozen.
+				xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), num)
+				if err != nil && err != preg.NotFound {
+					return out, ValidationUnknown
+				}
+				if err == nil {
+					vi = getExtensionFieldInfo(xt).validation
+				}
+			}
+			if vi.requiredBit != 0 {
+				// Check that the field has a compatible wire type.
+				// We only need to consider non-repeated field types,
+				// since repeated fields (and maps) can never be required.
+				ok := false
+				switch vi.typ {
+				case validationTypeVarint:
+					ok = wtyp == protowire.VarintType
+				case validationTypeFixed32:
+					ok = wtyp == protowire.Fixed32Type
+				case validationTypeFixed64:
+					ok = wtyp == protowire.Fixed64Type
+				case validationTypeBytes, validationTypeUTF8String, validationTypeMessage:
+					ok = wtyp == protowire.BytesType
+				case validationTypeGroup:
+					ok = wtyp == protowire.StartGroupType
+				}
+				if ok {
+					st.requiredMask |= vi.requiredBit
+				}
+			}
+
+			switch wtyp {
+			case protowire.VarintType:
+				if len(b) >= 10 {
+					switch {
+					case b[0] < 0x80:
+						b = b[1:]
+					case b[1] < 0x80:
+						b = b[2:]
+					case b[2] < 0x80:
+						b = b[3:]
+					case b[3] < 0x80:
+						b = b[4:]
+					case b[4] < 0x80:
+						b = b[5:]
+					case b[5] < 0x80:
+						b = b[6:]
+					case b[6] < 0x80:
+						b = b[7:]
+					case b[7] < 0x80:
+						b = b[8:]
+					case b[8] < 0x80:
+						b = b[9:]
+					case b[9] < 0x80 && b[9] < 2:
+						b = b[10:]
+					default:
+						return out, ValidationInvalid
+					}
+				} else {
+					switch {
+					case len(b) > 0 && b[0] < 0x80:
+						b = b[1:]
+					case len(b) > 1 && b[1] < 0x80:
+						b = b[2:]
+					case len(b) > 2 && b[2] < 0x80:
+						b = b[3:]
+					case len(b) > 3 && b[3] < 0x80:
+						b = b[4:]
+					case len(b) > 4 && b[4] < 0x80:
+						b = b[5:]
+					case len(b) > 5 && b[5] < 0x80:
+						b = b[6:]
+					case len(b) > 6 && b[6] < 0x80:
+						b = b[7:]
+					case len(b) > 7 && b[7] < 0x80:
+						b = b[8:]
+					case len(b) > 8 && b[8] < 0x80:
+						b = b[9:]
+					case len(b) > 9 && b[9] < 2:
+						b = b[10:]
+					default:
+						return out, ValidationInvalid
+					}
+				}
+				continue State
+			case protowire.BytesType:
+				var size uint64
+				if len(b) >= 1 && b[0] < 0x80 {
+					size = uint64(b[0])
+					b = b[1:]
+				} else if len(b) >= 2 && b[1] < 128 {
+					size = uint64(b[0]&0x7f) + uint64(b[1])<<7
+					b = b[2:]
+				} else {
+					var n int
+					size, n = protowire.ConsumeVarint(b)
+					if n < 0 {
+						return out, ValidationInvalid
+					}
+					b = b[n:]
+				}
+				if size > uint64(len(b)) {
+					return out, ValidationInvalid
+				}
+				v := b[:size]
+				b = b[size:]
+				switch vi.typ {
+				case validationTypeMessage:
+					if vi.mi == nil {
+						return out, ValidationUnknown
+					}
+					vi.mi.init()
+					fallthrough
+				case validationTypeMap:
+					if vi.mi != nil {
+						vi.mi.init()
+					}
+					states = append(states, validationState{
+						typ:     vi.typ,
+						keyType: vi.keyType,
+						valType: vi.valType,
+						mi:      vi.mi,
+						tail:    b,
+					})
+					b = v
+					continue State
+				case validationTypeRepeatedVarint:
+					// Packed field.
+					for len(v) > 0 {
+						_, n := protowire.ConsumeVarint(v)
+						if n < 0 {
+							return out, ValidationInvalid
+						}
+						v = v[n:]
+					}
+				case validationTypeRepeatedFixed32:
+					// Packed field.
+					if len(v)%4 != 0 {
+						return out, ValidationInvalid
+					}
+				case validationTypeRepeatedFixed64:
+					// Packed field.
+					if len(v)%8 != 0 {
+						return out, ValidationInvalid
+					}
+				case validationTypeUTF8String:
+					if !utf8.Valid(v) {
+						return out, ValidationInvalid
+					}
+				}
+			case protowire.Fixed32Type:
+				if len(b) < 4 {
+					return out, ValidationInvalid
+				}
+				b = b[4:]
+			case protowire.Fixed64Type:
+				if len(b) < 8 {
+					return out, ValidationInvalid
+				}
+				b = b[8:]
+			case protowire.StartGroupType:
+				switch {
+				case vi.typ == validationTypeGroup:
+					if vi.mi == nil {
+						return out, ValidationUnknown
+					}
+					vi.mi.init()
+					states = append(states, validationState{
+						typ:      validationTypeGroup,
+						mi:       vi.mi,
+						endGroup: num,
+					})
+					continue State
+				case flags.ProtoLegacy && vi.typ == validationTypeMessageSetItem:
+					typeid, v, n, err := messageset.ConsumeFieldValue(b, false)
+					if err != nil {
+						return out, ValidationInvalid
+					}
+					xt, err := opts.resolver.FindExtensionByNumber(st.mi.Desc.FullName(), typeid)
+					switch {
+					case err == preg.NotFound:
+						b = b[n:]
+					case err != nil:
+						return out, ValidationUnknown
+					default:
+						xvi := getExtensionFieldInfo(xt).validation
+						if xvi.mi != nil {
+							xvi.mi.init()
+						}
+						states = append(states, validationState{
+							typ:  xvi.typ,
+							mi:   xvi.mi,
+							tail: b[n:],
+						})
+						b = v
+						continue State
+					}
+				default:
+					n := protowire.ConsumeFieldValue(num, wtyp, b)
+					if n < 0 {
+						return out, ValidationInvalid
+					}
+					b = b[n:]
+				}
+			default:
+				return out, ValidationInvalid
+			}
+		}
+		if st.endGroup != 0 {
+			return out, ValidationInvalid
+		}
+		if len(b) != 0 {
+			return out, ValidationInvalid
+		}
+		b = st.tail
+	PopState:
+		numRequiredFields := 0
+		switch st.typ {
+		case validationTypeMessage, validationTypeGroup:
+			numRequiredFields = int(st.mi.numRequiredFields)
+		case validationTypeMap:
+			// If this is a map field with a message value that contains
+			// required fields, require that the value be present.
+			if st.mi != nil && st.mi.numRequiredFields > 0 {
+				numRequiredFields = 1
+			}
+		}
+		// If there are more than 64 required fields, this check will
+		// always fail and we will report that the message is potentially
+		// uninitialized.
+		if numRequiredFields > 0 && bits.OnesCount64(st.requiredMask) != numRequiredFields {
+			initialized = false
+		}
+		states = states[:len(states)-1]
+	}
+	out.n = start - len(b)
+	if initialized {
+		out.initialized = true
+	}
+	return out, ValidationValid
+}
diff --git a/vendor/google.golang.org/protobuf/internal/impl/weak.go b/vendor/google.golang.org/protobuf/internal/impl/weak.go
new file mode 100644
index 0000000..009cbef
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/impl/weak.go
@@ -0,0 +1,74 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package impl
+
+import (
+	"fmt"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// weakFields adds methods to the exported WeakFields type for internal use.
+//
+// The exported type is an alias to an unnamed type, so methods can't be
+// defined directly on it.
+type weakFields WeakFields
+
+func (w weakFields) get(num pref.FieldNumber) (pref.ProtoMessage, bool) {
+	m, ok := w[int32(num)]
+	return m, ok
+}
+
+func (w *weakFields) set(num pref.FieldNumber, m pref.ProtoMessage) {
+	if *w == nil {
+		*w = make(weakFields)
+	}
+	(*w)[int32(num)] = m
+}
+
+func (w *weakFields) clear(num pref.FieldNumber) {
+	delete(*w, int32(num))
+}
+
+func (Export) HasWeak(w WeakFields, num pref.FieldNumber) bool {
+	_, ok := w[int32(num)]
+	return ok
+}
+
+func (Export) ClearWeak(w *WeakFields, num pref.FieldNumber) {
+	delete(*w, int32(num))
+}
+
+func (Export) GetWeak(w WeakFields, num pref.FieldNumber, name pref.FullName) pref.ProtoMessage {
+	if m, ok := w[int32(num)]; ok {
+		return m
+	}
+	mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
+	if mt == nil {
+		panic(fmt.Sprintf("message %v for weak field is not linked in", name))
+	}
+	return mt.Zero().Interface()
+}
+
+func (Export) SetWeak(w *WeakFields, num pref.FieldNumber, name pref.FullName, m pref.ProtoMessage) {
+	if m != nil {
+		mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
+		if mt == nil {
+			panic(fmt.Sprintf("message %v for weak field is not linked in", name))
+		}
+		if mt != m.ProtoReflect().Type() {
+			panic(fmt.Sprintf("invalid message type for weak field: got %T, want %T", m, mt.Zero().Interface()))
+		}
+	}
+	if m == nil || !m.ProtoReflect().IsValid() {
+		delete(*w, int32(num))
+		return
+	}
+	if *w == nil {
+		*w = make(weakFields)
+	}
+	(*w)[int32(num)] = m
+}
diff --git a/vendor/google.golang.org/protobuf/internal/mapsort/mapsort.go b/vendor/google.golang.org/protobuf/internal/mapsort/mapsort.go
new file mode 100644
index 0000000..a3de1cf
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/mapsort/mapsort.go
@@ -0,0 +1,43 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package mapsort provides sorted access to maps.
+package mapsort
+
+import (
+	"sort"
+
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Range iterates over every map entry in sorted key order,
+// calling f for each key and value encountered.
+func Range(mapv protoreflect.Map, keyKind protoreflect.Kind, f func(protoreflect.MapKey, protoreflect.Value) bool) {
+	var keys []protoreflect.MapKey
+	mapv.Range(func(key protoreflect.MapKey, _ protoreflect.Value) bool {
+		keys = append(keys, key)
+		return true
+	})
+	sort.Slice(keys, func(i, j int) bool {
+		switch keyKind {
+		case protoreflect.BoolKind:
+			return !keys[i].Bool() && keys[j].Bool()
+		case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind,
+			protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
+			return keys[i].Int() < keys[j].Int()
+		case protoreflect.Uint32Kind, protoreflect.Fixed32Kind,
+			protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
+			return keys[i].Uint() < keys[j].Uint()
+		case protoreflect.StringKind:
+			return keys[i].String() < keys[j].String()
+		default:
+			panic("invalid kind: " + keyKind.String())
+		}
+	})
+	for _, key := range keys {
+		if !f(key, mapv.Get(key)) {
+			break
+		}
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/internal/pragma/pragma.go b/vendor/google.golang.org/protobuf/internal/pragma/pragma.go
new file mode 100644
index 0000000..49dc4fc
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/pragma/pragma.go
@@ -0,0 +1,29 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package pragma provides types that can be embedded into a struct to
+// statically enforce or prevent certain language properties.
+package pragma
+
+import "sync"
+
+// NoUnkeyedLiterals can be embedded in a struct to prevent unkeyed literals.
+type NoUnkeyedLiterals struct{}
+
+// DoNotImplement can be embedded in an interface to prevent trivial
+// implementations of the interface.
+//
+// This is useful to prevent unauthorized implementations of an interface
+// so that it can be extended in the future for any protobuf language changes.
+type DoNotImplement interface{ ProtoInternal(DoNotImplement) }
+
+// DoNotCompare can be embedded in a struct to prevent comparability.
+type DoNotCompare [0]func()
+
+// DoNotCopy can be embedded in a struct to help prevent shallow copies.
+// This does not rely on a Go language feature, but rather a special case
+// within the vet checker.
+//
+// See https://golang.org/issues/8005.
+type DoNotCopy [0]sync.Mutex
diff --git a/vendor/google.golang.org/protobuf/internal/set/ints.go b/vendor/google.golang.org/protobuf/internal/set/ints.go
new file mode 100644
index 0000000..d3d7f89
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/set/ints.go
@@ -0,0 +1,58 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package set provides simple set data structures for uint64s.
+package set
+
+import "math/bits"
+
+// int64s represents a set of integers within the range of 0..63.
+type int64s uint64
+
+func (bs *int64s) Len() int {
+	return bits.OnesCount64(uint64(*bs))
+}
+func (bs *int64s) Has(n uint64) bool {
+	return uint64(*bs)&(uint64(1)<<n) > 0
+}
+func (bs *int64s) Set(n uint64) {
+	*(*uint64)(bs) |= uint64(1) << n
+}
+func (bs *int64s) Clear(n uint64) {
+	*(*uint64)(bs) &^= uint64(1) << n
+}
+
+// Ints represents a set of integers within the range of 0..math.MaxUint64.
+type Ints struct {
+	lo int64s
+	hi map[uint64]struct{}
+}
+
+func (bs *Ints) Len() int {
+	return bs.lo.Len() + len(bs.hi)
+}
+func (bs *Ints) Has(n uint64) bool {
+	if n < 64 {
+		return bs.lo.Has(n)
+	}
+	_, ok := bs.hi[n]
+	return ok
+}
+func (bs *Ints) Set(n uint64) {
+	if n < 64 {
+		bs.lo.Set(n)
+		return
+	}
+	if bs.hi == nil {
+		bs.hi = make(map[uint64]struct{})
+	}
+	bs.hi[n] = struct{}{}
+}
+func (bs *Ints) Clear(n uint64) {
+	if n < 64 {
+		bs.lo.Clear(n)
+		return
+	}
+	delete(bs.hi, n)
+}
diff --git a/vendor/google.golang.org/protobuf/internal/strs/strings.go b/vendor/google.golang.org/protobuf/internal/strs/strings.go
new file mode 100644
index 0000000..0b74e76
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/strs/strings.go
@@ -0,0 +1,196 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package strs provides string manipulation functionality specific to protobuf.
+package strs
+
+import (
+	"go/token"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// EnforceUTF8 reports whether to enforce strict UTF-8 validation.
+func EnforceUTF8(fd protoreflect.FieldDescriptor) bool {
+	if flags.ProtoLegacy {
+		if fd, ok := fd.(interface{ EnforceUTF8() bool }); ok {
+			return fd.EnforceUTF8()
+		}
+	}
+	return fd.Syntax() == protoreflect.Proto3
+}
+
+// GoCamelCase camel-cases a protobuf name for use as a Go identifier.
+//
+// If there is an interior underscore followed by a lower case letter,
+// drop the underscore and convert the letter to upper case.
+func GoCamelCase(s string) string {
+	// Invariant: if the next letter is lower case, it must be converted
+	// to upper case.
+	// That is, we process a word at a time, where words are marked by _ or
+	// upper case letter. Digits are treated as words.
+	var b []byte
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		case c == '.' && i+1 < len(s) && isASCIILower(s[i+1]):
+			// Skip over '.' in ".{{lowercase}}".
+		case c == '.':
+			b = append(b, '_') // convert '.' to '_'
+		case c == '_' && (i == 0 || s[i-1] == '.'):
+			// Convert initial '_' to ensure we start with a capital letter.
+			// Do the same for '_' after '.' to match historic behavior.
+			b = append(b, 'X') // convert '_' to 'X'
+		case c == '_' && i+1 < len(s) && isASCIILower(s[i+1]):
+			// Skip over '_' in "_{{lowercase}}".
+		case isASCIIDigit(c):
+			b = append(b, c)
+		default:
+			// Assume we have a letter now - if not, it's a bogus identifier.
+			// The next word is a sequence of characters that must start upper case.
+			if isASCIILower(c) {
+				c -= 'a' - 'A' // convert lowercase to uppercase
+			}
+			b = append(b, c)
+
+			// Accept lower case sequence that follows.
+			for ; i+1 < len(s) && isASCIILower(s[i+1]); i++ {
+				b = append(b, s[i+1])
+			}
+		}
+	}
+	return string(b)
+}
+
+// GoSanitized converts a string to a valid Go identifier.
+func GoSanitized(s string) string {
+	// Sanitize the input to the set of valid characters,
+	// which must be '_' or be in the Unicode L or N categories.
+	s = strings.Map(func(r rune) rune {
+		if unicode.IsLetter(r) || unicode.IsDigit(r) {
+			return r
+		}
+		return '_'
+	}, s)
+
+	// Prepend '_' in the event of a Go keyword conflict or if
+	// the identifier is invalid (does not start in the Unicode L category).
+	r, _ := utf8.DecodeRuneInString(s)
+	if token.Lookup(s).IsKeyword() || !unicode.IsLetter(r) {
+		return "_" + s
+	}
+	return s
+}
+
+// JSONCamelCase converts a snake_case identifier to a camelCase identifier,
+// according to the protobuf JSON specification.
+func JSONCamelCase(s string) string {
+	var b []byte
+	var wasUnderscore bool
+	for i := 0; i < len(s); i++ { // proto identifiers are always ASCII
+		c := s[i]
+		if c != '_' {
+			if wasUnderscore && isASCIILower(c) {
+				c -= 'a' - 'A' // convert to uppercase
+			}
+			b = append(b, c)
+		}
+		wasUnderscore = c == '_'
+	}
+	return string(b)
+}
+
+// JSONSnakeCase converts a camelCase identifier to a snake_case identifier,
+// according to the protobuf JSON specification.
+func JSONSnakeCase(s string) string {
+	var b []byte
+	for i := 0; i < len(s); i++ { // proto identifiers are always ASCII
+		c := s[i]
+		if isASCIIUpper(c) {
+			b = append(b, '_')
+			c += 'a' - 'A' // convert to lowercase
+		}
+		b = append(b, c)
+	}
+	return string(b)
+}
+
+// MapEntryName derives the name of the map entry message given the field name.
+// See protoc v3.8.0: src/google/protobuf/descriptor.cc:254-276,6057
+func MapEntryName(s string) string {
+	var b []byte
+	upperNext := true
+	for _, c := range s {
+		switch {
+		case c == '_':
+			upperNext = true
+		case upperNext:
+			b = append(b, byte(unicode.ToUpper(c)))
+			upperNext = false
+		default:
+			b = append(b, byte(c))
+		}
+	}
+	b = append(b, "Entry"...)
+	return string(b)
+}
+
+// EnumValueName derives the camel-cased enum value name.
+// See protoc v3.8.0: src/google/protobuf/descriptor.cc:297-313
+func EnumValueName(s string) string {
+	var b []byte
+	upperNext := true
+	for _, c := range s {
+		switch {
+		case c == '_':
+			upperNext = true
+		case upperNext:
+			b = append(b, byte(unicode.ToUpper(c)))
+			upperNext = false
+		default:
+			b = append(b, byte(unicode.ToLower(c)))
+			upperNext = false
+		}
+	}
+	return string(b)
+}
+
+// TrimEnumPrefix trims the enum name prefix from an enum value name,
+// where the prefix is all lowercase without underscores.
+// See protoc v3.8.0: src/google/protobuf/descriptor.cc:330-375
+func TrimEnumPrefix(s, prefix string) string {
+	s0 := s // original input
+	for len(s) > 0 && len(prefix) > 0 {
+		if s[0] == '_' {
+			s = s[1:]
+			continue
+		}
+		if unicode.ToLower(rune(s[0])) != rune(prefix[0]) {
+			return s0 // no prefix match
+		}
+		s, prefix = s[1:], prefix[1:]
+	}
+	if len(prefix) > 0 {
+		return s0 // no prefix match
+	}
+	s = strings.TrimLeft(s, "_")
+	if len(s) == 0 {
+		return s0 // avoid returning empty string
+	}
+	return s
+}
+
+func isASCIILower(c byte) bool {
+	return 'a' <= c && c <= 'z'
+}
+func isASCIIUpper(c byte) bool {
+	return 'A' <= c && c <= 'Z'
+}
+func isASCIIDigit(c byte) bool {
+	return '0' <= c && c <= '9'
+}
diff --git a/vendor/google.golang.org/protobuf/internal/strs/strings_pure.go b/vendor/google.golang.org/protobuf/internal/strs/strings_pure.go
new file mode 100644
index 0000000..85e074c
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/strs/strings_pure.go
@@ -0,0 +1,27 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build purego appengine
+
+package strs
+
+import pref "google.golang.org/protobuf/reflect/protoreflect"
+
+func UnsafeString(b []byte) string {
+	return string(b)
+}
+
+func UnsafeBytes(s string) []byte {
+	return []byte(s)
+}
+
+type Builder struct{}
+
+func (*Builder) AppendFullName(prefix pref.FullName, name pref.Name) pref.FullName {
+	return prefix.Append(name)
+}
+
+func (*Builder) MakeString(b []byte) string {
+	return string(b)
+}
diff --git a/vendor/google.golang.org/protobuf/internal/strs/strings_unsafe.go b/vendor/google.golang.org/protobuf/internal/strs/strings_unsafe.go
new file mode 100644
index 0000000..2160c70
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/strs/strings_unsafe.go
@@ -0,0 +1,94 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !purego,!appengine
+
+package strs
+
+import (
+	"unsafe"
+
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type (
+	stringHeader struct {
+		Data unsafe.Pointer
+		Len  int
+	}
+	sliceHeader struct {
+		Data unsafe.Pointer
+		Len  int
+		Cap  int
+	}
+)
+
+// UnsafeString returns an unsafe string reference of b.
+// The caller must treat the input slice as immutable.
+//
+// WARNING: Use carefully. The returned result must not leak to the end user
+// unless the input slice is provably immutable.
+func UnsafeString(b []byte) (s string) {
+	src := (*sliceHeader)(unsafe.Pointer(&b))
+	dst := (*stringHeader)(unsafe.Pointer(&s))
+	dst.Data = src.Data
+	dst.Len = src.Len
+	return s
+}
+
+// UnsafeBytes returns an unsafe bytes slice reference of s.
+// The caller must treat returned slice as immutable.
+//
+// WARNING: Use carefully. The returned result must not leak to the end user.
+func UnsafeBytes(s string) (b []byte) {
+	src := (*stringHeader)(unsafe.Pointer(&s))
+	dst := (*sliceHeader)(unsafe.Pointer(&b))
+	dst.Data = src.Data
+	dst.Len = src.Len
+	dst.Cap = src.Len
+	return b
+}
+
+// Builder builds a set of strings with shared lifetime.
+// This differs from strings.Builder, which is for building a single string.
+type Builder struct {
+	buf []byte
+}
+
+// AppendFullName is equivalent to protoreflect.FullName.Append,
+// but optimized for large batches where each name has a shared lifetime.
+func (sb *Builder) AppendFullName(prefix pref.FullName, name pref.Name) pref.FullName {
+	n := len(prefix) + len(".") + len(name)
+	if len(prefix) == 0 {
+		n -= len(".")
+	}
+	sb.grow(n)
+	sb.buf = append(sb.buf, prefix...)
+	sb.buf = append(sb.buf, '.')
+	sb.buf = append(sb.buf, name...)
+	return pref.FullName(sb.last(n))
+}
+
+// MakeString is equivalent to string(b), but optimized for large batches
+// with a shared lifetime.
+func (sb *Builder) MakeString(b []byte) string {
+	sb.grow(len(b))
+	sb.buf = append(sb.buf, b...)
+	return sb.last(len(b))
+}
+
+func (sb *Builder) grow(n int) {
+	if cap(sb.buf)-len(sb.buf) >= n {
+		return
+	}
+
+	// Unlike strings.Builder, we do not need to copy over the contents
+	// of the old buffer since our builder provides no API for
+	// retrieving previously created strings.
+	sb.buf = make([]byte, 2*(cap(sb.buf)+n))
+}
+
+func (sb *Builder) last(n int) string {
+	return UnsafeString(sb.buf[len(sb.buf)-n:])
+}
diff --git a/vendor/google.golang.org/protobuf/internal/version/version.go b/vendor/google.golang.org/protobuf/internal/version/version.go
new file mode 100644
index 0000000..4088e59
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/version/version.go
@@ -0,0 +1,79 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package version records versioning information about this module.
+package version
+
+import (
+	"fmt"
+	"strings"
+)
+
+// These constants determine the current version of this module.
+//
+//
+// For our release process, we enforce the following rules:
+//	* Tagged releases use a tag that is identical to String.
+//	* Tagged releases never reference a commit where the String
+//	contains "devel".
+//	* The set of all commits in this repository where String
+//	does not contain "devel" must have a unique String.
+//
+//
+// Steps for tagging a new release:
+//	1. Create a new CL.
+//
+//	2. Update Minor, Patch, and/or PreRelease as necessary.
+//	PreRelease must not contain the string "devel".
+//
+//	3. Since the last released minor version, have there been any changes to
+//	generator that relies on new functionality in the runtime?
+//	If yes, then increment RequiredGenerated.
+//
+//	4. Since the last released minor version, have there been any changes to
+//	the runtime that removes support for old .pb.go source code?
+//	If yes, then increment SupportMinimum.
+//
+//	5. Send out the CL for review and submit it.
+//	Note that the next CL in step 8 must be submitted after this CL
+//	without any other CLs in-between.
+//
+//	6. Tag a new version, where the tag is is the current String.
+//
+//	7. Write release notes for all notable changes
+//	between this release and the last release.
+//
+//	8. Create a new CL.
+//
+//	9. Update PreRelease to include the string "devel".
+//	For example: "" -> "devel" or "rc.1" -> "rc.1.devel"
+//
+//	10. Send out the CL for review and submit it.
+const (
+	Major      = 1
+	Minor      = 23
+	Patch      = 0
+	PreRelease = ""
+)
+
+// String formats the version string for this module in semver format.
+//
+// Examples:
+//	v1.20.1
+//	v1.21.0-rc.1
+func String() string {
+	v := fmt.Sprintf("v%d.%d.%d", Major, Minor, Patch)
+	if PreRelease != "" {
+		v += "-" + PreRelease
+
+		// TODO: Add metadata about the commit or build hash.
+		// See https://golang.org/issue/29814
+		// See https://golang.org/issue/33533
+		var metadata string
+		if strings.Contains(PreRelease, "devel") && metadata != "" {
+			v += "+" + metadata
+		}
+	}
+	return v
+}
diff --git a/vendor/google.golang.org/protobuf/proto/checkinit.go b/vendor/google.golang.org/protobuf/proto/checkinit.go
new file mode 100644
index 0000000..3e9a6a2
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/checkinit.go
@@ -0,0 +1,71 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+// CheckInitialized returns an error if any required fields in m are not set.
+func CheckInitialized(m Message) error {
+	// Treat a nil message interface as an "untyped" empty message,
+	// which we assume to have no required fields.
+	if m == nil {
+		return nil
+	}
+
+	return checkInitialized(m.ProtoReflect())
+}
+
+// CheckInitialized returns an error if any required fields in m are not set.
+func checkInitialized(m protoreflect.Message) error {
+	if methods := protoMethods(m); methods != nil && methods.CheckInitialized != nil {
+		_, err := methods.CheckInitialized(protoiface.CheckInitializedInput{
+			Message: m,
+		})
+		return err
+	}
+	return checkInitializedSlow(m)
+}
+
+func checkInitializedSlow(m protoreflect.Message) error {
+	md := m.Descriptor()
+	fds := md.Fields()
+	for i, nums := 0, md.RequiredNumbers(); i < nums.Len(); i++ {
+		fd := fds.ByNumber(nums.Get(i))
+		if !m.Has(fd) {
+			return errors.RequiredNotSet(string(fd.FullName()))
+		}
+	}
+	var err error
+	m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		switch {
+		case fd.IsList():
+			if fd.Message() == nil {
+				return true
+			}
+			for i, list := 0, v.List(); i < list.Len() && err == nil; i++ {
+				err = checkInitialized(list.Get(i).Message())
+			}
+		case fd.IsMap():
+			if fd.MapValue().Message() == nil {
+				return true
+			}
+			v.Map().Range(func(key protoreflect.MapKey, v protoreflect.Value) bool {
+				err = checkInitialized(v.Message())
+				return err == nil
+			})
+		default:
+			if fd.Message() == nil {
+				return true
+			}
+			err = checkInitialized(v.Message())
+		}
+		return err == nil
+	})
+	return err
+}
diff --git a/vendor/google.golang.org/protobuf/proto/decode.go b/vendor/google.golang.org/protobuf/proto/decode.go
new file mode 100644
index 0000000..1282147
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/decode.go
@@ -0,0 +1,270 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+// UnmarshalOptions configures the unmarshaler.
+//
+// Example usage:
+//   err := UnmarshalOptions{DiscardUnknown: true}.Unmarshal(b, m)
+type UnmarshalOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// Merge merges the input into the destination message.
+	// The default behavior is to always reset the message before unmarshaling,
+	// unless Merge is specified.
+	Merge bool
+
+	// AllowPartial accepts input for messages that will result in missing
+	// required fields. If AllowPartial is false (the default), Unmarshal will
+	// return an error if there are any missing required fields.
+	AllowPartial bool
+
+	// If DiscardUnknown is set, unknown fields are ignored.
+	DiscardUnknown bool
+
+	// Resolver is used for looking up types when unmarshaling extension fields.
+	// If nil, this defaults to using protoregistry.GlobalTypes.
+	Resolver interface {
+		FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
+		FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
+	}
+}
+
+// Unmarshal parses the wire-format message in b and places the result in m.
+func Unmarshal(b []byte, m Message) error {
+	_, err := UnmarshalOptions{}.unmarshal(b, m.ProtoReflect())
+	return err
+}
+
+// Unmarshal parses the wire-format message in b and places the result in m.
+func (o UnmarshalOptions) Unmarshal(b []byte, m Message) error {
+	_, err := o.unmarshal(b, m.ProtoReflect())
+	return err
+}
+
+// UnmarshalState parses a wire-format message and places the result in m.
+//
+// This method permits fine-grained control over the unmarshaler.
+// Most users should use Unmarshal instead.
+func (o UnmarshalOptions) UnmarshalState(in protoiface.UnmarshalInput) (protoiface.UnmarshalOutput, error) {
+	return o.unmarshal(in.Buf, in.Message)
+}
+
+func (o UnmarshalOptions) unmarshal(b []byte, m protoreflect.Message) (out protoiface.UnmarshalOutput, err error) {
+	if o.Resolver == nil {
+		o.Resolver = protoregistry.GlobalTypes
+	}
+	if !o.Merge {
+		Reset(m.Interface()) // TODO
+	}
+	allowPartial := o.AllowPartial
+	o.Merge = true
+	o.AllowPartial = true
+	methods := protoMethods(m)
+	if methods != nil && methods.Unmarshal != nil &&
+		!(o.DiscardUnknown && methods.Flags&protoiface.SupportUnmarshalDiscardUnknown == 0) {
+		in := protoiface.UnmarshalInput{
+			Message:  m,
+			Buf:      b,
+			Resolver: o.Resolver,
+		}
+		if o.DiscardUnknown {
+			in.Flags |= protoiface.UnmarshalDiscardUnknown
+		}
+		out, err = methods.Unmarshal(in)
+	} else {
+		err = o.unmarshalMessageSlow(b, m)
+	}
+	if err != nil {
+		return out, err
+	}
+	if allowPartial || (out.Flags&protoiface.UnmarshalInitialized != 0) {
+		return out, nil
+	}
+	return out, checkInitialized(m)
+}
+
+func (o UnmarshalOptions) unmarshalMessage(b []byte, m protoreflect.Message) error {
+	_, err := o.unmarshal(b, m)
+	return err
+}
+
+func (o UnmarshalOptions) unmarshalMessageSlow(b []byte, m protoreflect.Message) error {
+	md := m.Descriptor()
+	if messageset.IsMessageSet(md) {
+		return unmarshalMessageSet(b, m, o)
+	}
+	fields := md.Fields()
+	for len(b) > 0 {
+		// Parse the tag (field number and wire type).
+		num, wtyp, tagLen := protowire.ConsumeTag(b)
+		if tagLen < 0 {
+			return protowire.ParseError(tagLen)
+		}
+		if num > protowire.MaxValidNumber {
+			return errors.New("invalid field number")
+		}
+
+		// Find the field descriptor for this field number.
+		fd := fields.ByNumber(num)
+		if fd == nil && md.ExtensionRanges().Has(num) {
+			extType, err := o.Resolver.FindExtensionByNumber(md.FullName(), num)
+			if err != nil && err != protoregistry.NotFound {
+				return errors.New("%v: unable to resolve extension %v: %v", md.FullName(), num, err)
+			}
+			if extType != nil {
+				fd = extType.TypeDescriptor()
+			}
+		}
+		var err error
+		if fd == nil {
+			err = errUnknown
+		} else if flags.ProtoLegacy {
+			if fd.IsWeak() && fd.Message().IsPlaceholder() {
+				err = errUnknown // weak referent is not linked in
+			}
+		}
+
+		// Parse the field value.
+		var valLen int
+		switch {
+		case err != nil:
+		case fd.IsList():
+			valLen, err = o.unmarshalList(b[tagLen:], wtyp, m.Mutable(fd).List(), fd)
+		case fd.IsMap():
+			valLen, err = o.unmarshalMap(b[tagLen:], wtyp, m.Mutable(fd).Map(), fd)
+		default:
+			valLen, err = o.unmarshalSingular(b[tagLen:], wtyp, m, fd)
+		}
+		if err != nil {
+			if err != errUnknown {
+				return err
+			}
+			valLen = protowire.ConsumeFieldValue(num, wtyp, b[tagLen:])
+			if valLen < 0 {
+				return protowire.ParseError(valLen)
+			}
+			if !o.DiscardUnknown {
+				m.SetUnknown(append(m.GetUnknown(), b[:tagLen+valLen]...))
+			}
+		}
+		b = b[tagLen+valLen:]
+	}
+	return nil
+}
+
+func (o UnmarshalOptions) unmarshalSingular(b []byte, wtyp protowire.Type, m protoreflect.Message, fd protoreflect.FieldDescriptor) (n int, err error) {
+	v, n, err := o.unmarshalScalar(b, wtyp, fd)
+	if err != nil {
+		return 0, err
+	}
+	switch fd.Kind() {
+	case protoreflect.GroupKind, protoreflect.MessageKind:
+		m2 := m.Mutable(fd).Message()
+		if err := o.unmarshalMessage(v.Bytes(), m2); err != nil {
+			return n, err
+		}
+	default:
+		// Non-message scalars replace the previous value.
+		m.Set(fd, v)
+	}
+	return n, nil
+}
+
+func (o UnmarshalOptions) unmarshalMap(b []byte, wtyp protowire.Type, mapv protoreflect.Map, fd protoreflect.FieldDescriptor) (n int, err error) {
+	if wtyp != protowire.BytesType {
+		return 0, errUnknown
+	}
+	b, n = protowire.ConsumeBytes(b)
+	if n < 0 {
+		return 0, protowire.ParseError(n)
+	}
+	var (
+		keyField = fd.MapKey()
+		valField = fd.MapValue()
+		key      protoreflect.Value
+		val      protoreflect.Value
+		haveKey  bool
+		haveVal  bool
+	)
+	switch valField.Kind() {
+	case protoreflect.GroupKind, protoreflect.MessageKind:
+		val = mapv.NewValue()
+	}
+	// Map entries are represented as a two-element message with fields
+	// containing the key and value.
+	for len(b) > 0 {
+		num, wtyp, n := protowire.ConsumeTag(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		if num > protowire.MaxValidNumber {
+			return 0, errors.New("invalid field number")
+		}
+		b = b[n:]
+		err = errUnknown
+		switch num {
+		case 1:
+			key, n, err = o.unmarshalScalar(b, wtyp, keyField)
+			if err != nil {
+				break
+			}
+			haveKey = true
+		case 2:
+			var v protoreflect.Value
+			v, n, err = o.unmarshalScalar(b, wtyp, valField)
+			if err != nil {
+				break
+			}
+			switch valField.Kind() {
+			case protoreflect.GroupKind, protoreflect.MessageKind:
+				if err := o.unmarshalMessage(v.Bytes(), val.Message()); err != nil {
+					return 0, err
+				}
+			default:
+				val = v
+			}
+			haveVal = true
+		}
+		if err == errUnknown {
+			n = protowire.ConsumeFieldValue(num, wtyp, b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+		} else if err != nil {
+			return 0, err
+		}
+		b = b[n:]
+	}
+	// Every map entry should have entries for key and value, but this is not strictly required.
+	if !haveKey {
+		key = keyField.Default()
+	}
+	if !haveVal {
+		switch valField.Kind() {
+		case protoreflect.GroupKind, protoreflect.MessageKind:
+		default:
+			val = valField.Default()
+		}
+	}
+	mapv.Set(key.MapKey(), val)
+	return n, nil
+}
+
+// errUnknown is used internally to indicate fields which should be added
+// to the unknown field set of a message. It is never returned from an exported
+// function.
+var errUnknown = errors.New("BUG: internal error (unknown)")
diff --git a/vendor/google.golang.org/protobuf/proto/decode_gen.go b/vendor/google.golang.org/protobuf/proto/decode_gen.go
new file mode 100644
index 0000000..d6dc904
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/decode_gen.go
@@ -0,0 +1,603 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package proto
+
+import (
+	"math"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// unmarshalScalar decodes a value of the given kind.
+//
+// Message values are decoded into a []byte which aliases the input data.
+func (o UnmarshalOptions) unmarshalScalar(b []byte, wtyp protowire.Type, fd protoreflect.FieldDescriptor) (val protoreflect.Value, n int, err error) {
+	switch fd.Kind() {
+	case protoreflect.BoolKind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfBool(protowire.DecodeBool(v)), n, nil
+	case protoreflect.EnumKind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)), n, nil
+	case protoreflect.Int32Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt32(int32(v)), n, nil
+	case protoreflect.Sint32Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))), n, nil
+	case protoreflect.Uint32Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfUint32(uint32(v)), n, nil
+	case protoreflect.Int64Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt64(int64(v)), n, nil
+	case protoreflect.Sint64Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)), n, nil
+	case protoreflect.Uint64Kind:
+		if wtyp != protowire.VarintType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfUint64(v), n, nil
+	case protoreflect.Sfixed32Kind:
+		if wtyp != protowire.Fixed32Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt32(int32(v)), n, nil
+	case protoreflect.Fixed32Kind:
+		if wtyp != protowire.Fixed32Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfUint32(uint32(v)), n, nil
+	case protoreflect.FloatKind:
+		if wtyp != protowire.Fixed32Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))), n, nil
+	case protoreflect.Sfixed64Kind:
+		if wtyp != protowire.Fixed64Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfInt64(int64(v)), n, nil
+	case protoreflect.Fixed64Kind:
+		if wtyp != protowire.Fixed64Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfUint64(v), n, nil
+	case protoreflect.DoubleKind:
+		if wtyp != protowire.Fixed64Type {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfFloat64(math.Float64frombits(v)), n, nil
+	case protoreflect.StringKind:
+		if wtyp != protowire.BytesType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		if strs.EnforceUTF8(fd) && !utf8.Valid(v) {
+			return protoreflect.Value{}, 0, errors.InvalidUTF8(string(fd.FullName()))
+		}
+		return protoreflect.ValueOfString(string(v)), n, nil
+	case protoreflect.BytesKind:
+		if wtyp != protowire.BytesType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfBytes(append(emptyBuf[:], v...)), n, nil
+	case protoreflect.MessageKind:
+		if wtyp != protowire.BytesType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfBytes(v), n, nil
+	case protoreflect.GroupKind:
+		if wtyp != protowire.StartGroupType {
+			return val, 0, errUnknown
+		}
+		v, n := protowire.ConsumeGroup(fd.Number(), b)
+		if n < 0 {
+			return val, 0, protowire.ParseError(n)
+		}
+		return protoreflect.ValueOfBytes(v), n, nil
+	default:
+		return val, 0, errUnknown
+	}
+}
+
+func (o UnmarshalOptions) unmarshalList(b []byte, wtyp protowire.Type, list protoreflect.List, fd protoreflect.FieldDescriptor) (n int, err error) {
+	switch fd.Kind() {
+	case protoreflect.BoolKind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfBool(protowire.DecodeBool(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfBool(protowire.DecodeBool(v)))
+		return n, nil
+	case protoreflect.EnumKind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfEnum(protoreflect.EnumNumber(v)))
+		return n, nil
+	case protoreflect.Int32Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt32(int32(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt32(int32(v)))
+		return n, nil
+	case protoreflect.Sint32Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt32(int32(protowire.DecodeZigZag(v & math.MaxUint32))))
+		return n, nil
+	case protoreflect.Uint32Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfUint32(uint32(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfUint32(uint32(v)))
+		return n, nil
+	case protoreflect.Int64Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt64(int64(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt64(int64(v)))
+		return n, nil
+	case protoreflect.Sint64Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt64(protowire.DecodeZigZag(v)))
+		return n, nil
+	case protoreflect.Uint64Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeVarint(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfUint64(v))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.VarintType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeVarint(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfUint64(v))
+		return n, nil
+	case protoreflect.Sfixed32Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed32(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt32(int32(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed32Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt32(int32(v)))
+		return n, nil
+	case protoreflect.Fixed32Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed32(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfUint32(uint32(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed32Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfUint32(uint32(v)))
+		return n, nil
+	case protoreflect.FloatKind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed32(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed32Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed32(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfFloat32(math.Float32frombits(uint32(v))))
+		return n, nil
+	case protoreflect.Sfixed64Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed64(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfInt64(int64(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed64Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfInt64(int64(v)))
+		return n, nil
+	case protoreflect.Fixed64Kind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed64(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfUint64(v))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed64Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfUint64(v))
+		return n, nil
+	case protoreflect.DoubleKind:
+		if wtyp == protowire.BytesType {
+			buf, n := protowire.ConsumeBytes(b)
+			if n < 0 {
+				return 0, protowire.ParseError(n)
+			}
+			for len(buf) > 0 {
+				v, n := protowire.ConsumeFixed64(buf)
+				if n < 0 {
+					return 0, protowire.ParseError(n)
+				}
+				buf = buf[n:]
+				list.Append(protoreflect.ValueOfFloat64(math.Float64frombits(v)))
+			}
+			return n, nil
+		}
+		if wtyp != protowire.Fixed64Type {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeFixed64(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfFloat64(math.Float64frombits(v)))
+		return n, nil
+	case protoreflect.StringKind:
+		if wtyp != protowire.BytesType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		if strs.EnforceUTF8(fd) && !utf8.Valid(v) {
+			return 0, errors.InvalidUTF8(string(fd.FullName()))
+		}
+		list.Append(protoreflect.ValueOfString(string(v)))
+		return n, nil
+	case protoreflect.BytesKind:
+		if wtyp != protowire.BytesType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		list.Append(protoreflect.ValueOfBytes(append(emptyBuf[:], v...)))
+		return n, nil
+	case protoreflect.MessageKind:
+		if wtyp != protowire.BytesType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeBytes(b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		m := list.NewElement()
+		if err := o.unmarshalMessage(v, m.Message()); err != nil {
+			return 0, err
+		}
+		list.Append(m)
+		return n, nil
+	case protoreflect.GroupKind:
+		if wtyp != protowire.StartGroupType {
+			return 0, errUnknown
+		}
+		v, n := protowire.ConsumeGroup(fd.Number(), b)
+		if n < 0 {
+			return 0, protowire.ParseError(n)
+		}
+		m := list.NewElement()
+		if err := o.unmarshalMessage(v, m.Message()); err != nil {
+			return 0, err
+		}
+		list.Append(m)
+		return n, nil
+	default:
+		return 0, errUnknown
+	}
+}
+
+// We append to an empty array rather than a nil []byte to get non-nil zero-length byte slices.
+var emptyBuf [0]byte
diff --git a/vendor/google.golang.org/protobuf/proto/doc.go b/vendor/google.golang.org/protobuf/proto/doc.go
new file mode 100644
index 0000000..c52d8c4
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/doc.go
@@ -0,0 +1,94 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package proto provides functions operating on protocol buffer messages.
+//
+// For documentation on protocol buffers in general, see:
+//
+//   https://developers.google.com/protocol-buffers
+//
+// For a tutorial on using protocol buffers with Go, see:
+//
+//   https://developers.google.com/protocol-buffers/docs/gotutorial
+//
+// For a guide to generated Go protocol buffer code, see:
+//
+//   https://developers.google.com/protocol-buffers/docs/reference/go-generated
+//
+//
+// Binary serialization
+//
+// This package contains functions to convert to and from the wire format,
+// an efficient binary serialization of protocol buffers.
+//
+// • Size reports the size of a message in the wire format.
+//
+// • Marshal converts a message to the wire format.
+// The MarshalOptions type provides more control over wire marshaling.
+//
+// • Unmarshal converts a message from the wire format.
+// The UnmarshalOptions type provides more control over wire unmarshaling.
+//
+//
+// Basic message operations
+//
+// • Clone makes a deep copy of a message.
+//
+// • Merge merges the content of a message into another.
+//
+// • Equal compares two messages. For more control over comparisons
+// and detailed reporting of differences, see package
+// "google.golang.org/protobuf/testing/protocmp".
+//
+// • Reset clears the content of a message.
+//
+// • CheckInitialized reports whether all required fields in a message are set.
+//
+//
+// Optional scalar constructors
+//
+// The API for some generated messages represents optional scalar fields
+// as pointers to a value. For example, an optional string field has the
+// Go type *string.
+//
+// • Bool, Int32, Int64, Uint32, Uint64, Float32, Float64, and String
+// take a value and return a pointer to a new instance of it,
+// to simplify construction of optional field values.
+//
+// Generated enum types usually have an Enum method which performs the
+// same operation.
+//
+// Optional scalar fields are only supported in proto2.
+//
+//
+// Extension accessors
+//
+// • HasExtension, GetExtension, SetExtension, and ClearExtension
+// access extension field values in a protocol buffer message.
+//
+// Extension fields are only supported in proto2.
+//
+//
+// Related packages
+//
+// • Package "google.golang.org/protobuf/encoding/protojson" converts messages to
+// and from JSON.
+//
+// • Package "google.golang.org/protobuf/encoding/prototext" converts messages to
+// and from the text format.
+//
+// • Package "google.golang.org/protobuf/reflect/protoreflect" provides a
+// reflection interface for protocol buffer data types.
+//
+// • Package "google.golang.org/protobuf/testing/protocmp" provides features
+// to compare protocol buffer messages with the "github.com/google/go-cmp/cmp"
+// package.
+//
+// • Package "google.golang.org/protobuf/types/dynamicpb" provides a dynamic
+// message type, suitable for working with messages where the protocol buffer
+// type is only known at runtime.
+//
+// This module contains additional packages for more specialized use cases.
+// Consult the individual package documentation for details.
+package proto
diff --git a/vendor/google.golang.org/protobuf/proto/encode.go b/vendor/google.golang.org/protobuf/proto/encode.go
new file mode 100644
index 0000000..456bfda
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/encode.go
@@ -0,0 +1,343 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"sort"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/fieldsort"
+	"google.golang.org/protobuf/internal/mapsort"
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+// MarshalOptions configures the marshaler.
+//
+// Example usage:
+//   b, err := MarshalOptions{Deterministic: true}.Marshal(m)
+type MarshalOptions struct {
+	pragma.NoUnkeyedLiterals
+
+	// AllowPartial allows messages that have missing required fields to marshal
+	// without returning an error. If AllowPartial is false (the default),
+	// Marshal will return an error if there are any missing required fields.
+	AllowPartial bool
+
+	// Deterministic controls whether the same message will always be
+	// serialized to the same bytes within the same binary.
+	//
+	// Setting this option guarantees that repeated serialization of
+	// the same message will return the same bytes, and that different
+	// processes of the same binary (which may be executing on different
+	// machines) will serialize equal messages to the same bytes.
+	// It has no effect on the resulting size of the encoded message compared
+	// to a non-deterministic marshal.
+	//
+	// Note that the deterministic serialization is NOT canonical across
+	// languages. It is not guaranteed to remain stable over time. It is
+	// unstable across different builds with schema changes due to unknown
+	// fields. Users who need canonical serialization (e.g., persistent
+	// storage in a canonical form, fingerprinting, etc.) must define
+	// their own canonicalization specification and implement their own
+	// serializer rather than relying on this API.
+	//
+	// If deterministic serialization is requested, map entries will be
+	// sorted by keys in lexographical order. This is an implementation
+	// detail and subject to change.
+	Deterministic bool
+
+	// UseCachedSize indicates that the result of a previous Size call
+	// may be reused.
+	//
+	// Setting this option asserts that:
+	//
+	// 1. Size has previously been called on this message with identical
+	// options (except for UseCachedSize itself).
+	//
+	// 2. The message and all its submessages have not changed in any
+	// way since the Size call.
+	//
+	// If either of these invariants is violated,
+	// the results are undefined and may include panics or corrupted output.
+	//
+	// Implementations MAY take this option into account to provide
+	// better performance, but there is no guarantee that they will do so.
+	// There is absolutely no guarantee that Size followed by Marshal with
+	// UseCachedSize set will perform equivalently to Marshal alone.
+	UseCachedSize bool
+}
+
+// Marshal returns the wire-format encoding of m.
+func Marshal(m Message) ([]byte, error) {
+	// Treat nil message interface as an empty message; nothing to output.
+	if m == nil {
+		return nil, nil
+	}
+
+	out, err := MarshalOptions{}.marshal(nil, m.ProtoReflect())
+	if len(out.Buf) == 0 && err == nil {
+		out.Buf = emptyBytesForMessage(m)
+	}
+	return out.Buf, err
+}
+
+// Marshal returns the wire-format encoding of m.
+func (o MarshalOptions) Marshal(m Message) ([]byte, error) {
+	// Treat nil message interface as an empty message; nothing to output.
+	if m == nil {
+		return nil, nil
+	}
+
+	out, err := o.marshal(nil, m.ProtoReflect())
+	if len(out.Buf) == 0 && err == nil {
+		out.Buf = emptyBytesForMessage(m)
+	}
+	return out.Buf, err
+}
+
+// emptyBytesForMessage returns a nil buffer if and only if m is invalid,
+// otherwise it returns a non-nil empty buffer.
+//
+// This is to assist the edge-case where user-code does the following:
+//	m1.OptionalBytes, _ = proto.Marshal(m2)
+// where they expect the proto2 "optional_bytes" field to be populated
+// if any only if m2 is a valid message.
+func emptyBytesForMessage(m Message) []byte {
+	if m == nil || !m.ProtoReflect().IsValid() {
+		return nil
+	}
+	return emptyBuf[:]
+}
+
+// MarshalAppend appends the wire-format encoding of m to b,
+// returning the result.
+func (o MarshalOptions) MarshalAppend(b []byte, m Message) ([]byte, error) {
+	// Treat nil message interface as an empty message; nothing to append.
+	if m == nil {
+		return b, nil
+	}
+
+	out, err := o.marshal(b, m.ProtoReflect())
+	return out.Buf, err
+}
+
+// MarshalState returns the wire-format encoding of a message.
+//
+// This method permits fine-grained control over the marshaler.
+// Most users should use Marshal instead.
+func (o MarshalOptions) MarshalState(in protoiface.MarshalInput) (protoiface.MarshalOutput, error) {
+	return o.marshal(in.Buf, in.Message)
+}
+
+func (o MarshalOptions) marshal(b []byte, m protoreflect.Message) (out protoiface.MarshalOutput, err error) {
+	allowPartial := o.AllowPartial
+	o.AllowPartial = true
+	if methods := protoMethods(m); methods != nil && methods.Marshal != nil &&
+		!(o.Deterministic && methods.Flags&protoiface.SupportMarshalDeterministic == 0) {
+		in := protoiface.MarshalInput{
+			Message: m,
+			Buf:     b,
+		}
+		if o.Deterministic {
+			in.Flags |= protoiface.MarshalDeterministic
+		}
+		if o.UseCachedSize {
+			in.Flags |= protoiface.MarshalUseCachedSize
+		}
+		if methods.Size != nil {
+			sout := methods.Size(protoiface.SizeInput{
+				Message: m,
+				Flags:   in.Flags,
+			})
+			if cap(b) < len(b)+sout.Size {
+				in.Buf = make([]byte, len(b), growcap(cap(b), len(b)+sout.Size))
+				copy(in.Buf, b)
+			}
+			in.Flags |= protoiface.MarshalUseCachedSize
+		}
+		out, err = methods.Marshal(in)
+	} else {
+		out.Buf, err = o.marshalMessageSlow(b, m)
+	}
+	if err != nil {
+		return out, err
+	}
+	if allowPartial {
+		return out, nil
+	}
+	return out, checkInitialized(m)
+}
+
+func (o MarshalOptions) marshalMessage(b []byte, m protoreflect.Message) ([]byte, error) {
+	out, err := o.marshal(b, m)
+	return out.Buf, err
+}
+
+// growcap scales up the capacity of a slice.
+//
+// Given a slice with a current capacity of oldcap and a desired
+// capacity of wantcap, growcap returns a new capacity >= wantcap.
+//
+// The algorithm is mostly identical to the one used by append as of Go 1.14.
+func growcap(oldcap, wantcap int) (newcap int) {
+	if wantcap > oldcap*2 {
+		newcap = wantcap
+	} else if oldcap < 1024 {
+		// The Go 1.14 runtime takes this case when len(s) < 1024,
+		// not when cap(s) < 1024. The difference doesn't seem
+		// significant here.
+		newcap = oldcap * 2
+	} else {
+		newcap = oldcap
+		for 0 < newcap && newcap < wantcap {
+			newcap += newcap / 4
+		}
+		if newcap <= 0 {
+			newcap = wantcap
+		}
+	}
+	return newcap
+}
+
+func (o MarshalOptions) marshalMessageSlow(b []byte, m protoreflect.Message) ([]byte, error) {
+	if messageset.IsMessageSet(m.Descriptor()) {
+		return marshalMessageSet(b, m, o)
+	}
+	// There are many choices for what order we visit fields in. The default one here
+	// is chosen for reasonable efficiency and simplicity given the protoreflect API.
+	// It is not deterministic, since Message.Range does not return fields in any
+	// defined order.
+	//
+	// When using deterministic serialization, we sort the known fields.
+	var err error
+	o.rangeFields(m, func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		b, err = o.marshalField(b, fd, v)
+		return err == nil
+	})
+	if err != nil {
+		return b, err
+	}
+	b = append(b, m.GetUnknown()...)
+	return b, nil
+}
+
+// rangeFields visits fields in a defined order when deterministic serialization is enabled.
+func (o MarshalOptions) rangeFields(m protoreflect.Message, f func(protoreflect.FieldDescriptor, protoreflect.Value) bool) {
+	if !o.Deterministic {
+		m.Range(f)
+		return
+	}
+	var fds []protoreflect.FieldDescriptor
+	m.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
+		fds = append(fds, fd)
+		return true
+	})
+	sort.Slice(fds, func(a, b int) bool {
+		return fieldsort.Less(fds[a], fds[b])
+	})
+	for _, fd := range fds {
+		if !f(fd, m.Get(fd)) {
+			break
+		}
+	}
+}
+
+func (o MarshalOptions) marshalField(b []byte, fd protoreflect.FieldDescriptor, value protoreflect.Value) ([]byte, error) {
+	switch {
+	case fd.IsList():
+		return o.marshalList(b, fd, value.List())
+	case fd.IsMap():
+		return o.marshalMap(b, fd, value.Map())
+	default:
+		b = protowire.AppendTag(b, fd.Number(), wireTypes[fd.Kind()])
+		return o.marshalSingular(b, fd, value)
+	}
+}
+
+func (o MarshalOptions) marshalList(b []byte, fd protoreflect.FieldDescriptor, list protoreflect.List) ([]byte, error) {
+	if fd.IsPacked() && list.Len() > 0 {
+		b = protowire.AppendTag(b, fd.Number(), protowire.BytesType)
+		b, pos := appendSpeculativeLength(b)
+		for i, llen := 0, list.Len(); i < llen; i++ {
+			var err error
+			b, err = o.marshalSingular(b, fd, list.Get(i))
+			if err != nil {
+				return b, err
+			}
+		}
+		b = finishSpeculativeLength(b, pos)
+		return b, nil
+	}
+
+	kind := fd.Kind()
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		var err error
+		b = protowire.AppendTag(b, fd.Number(), wireTypes[kind])
+		b, err = o.marshalSingular(b, fd, list.Get(i))
+		if err != nil {
+			return b, err
+		}
+	}
+	return b, nil
+}
+
+func (o MarshalOptions) marshalMap(b []byte, fd protoreflect.FieldDescriptor, mapv protoreflect.Map) ([]byte, error) {
+	keyf := fd.MapKey()
+	valf := fd.MapValue()
+	var err error
+	o.rangeMap(mapv, keyf.Kind(), func(key protoreflect.MapKey, value protoreflect.Value) bool {
+		b = protowire.AppendTag(b, fd.Number(), protowire.BytesType)
+		var pos int
+		b, pos = appendSpeculativeLength(b)
+
+		b, err = o.marshalField(b, keyf, key.Value())
+		if err != nil {
+			return false
+		}
+		b, err = o.marshalField(b, valf, value)
+		if err != nil {
+			return false
+		}
+		b = finishSpeculativeLength(b, pos)
+		return true
+	})
+	return b, err
+}
+
+func (o MarshalOptions) rangeMap(mapv protoreflect.Map, kind protoreflect.Kind, f func(protoreflect.MapKey, protoreflect.Value) bool) {
+	if !o.Deterministic {
+		mapv.Range(f)
+		return
+	}
+	mapsort.Range(mapv, kind, f)
+}
+
+// When encoding length-prefixed fields, we speculatively set aside some number of bytes
+// for the length, encode the data, and then encode the length (shifting the data if necessary
+// to make room).
+const speculativeLength = 1
+
+func appendSpeculativeLength(b []byte) ([]byte, int) {
+	pos := len(b)
+	b = append(b, "\x00\x00\x00\x00"[:speculativeLength]...)
+	return b, pos
+}
+
+func finishSpeculativeLength(b []byte, pos int) []byte {
+	mlen := len(b) - pos - speculativeLength
+	msiz := protowire.SizeVarint(uint64(mlen))
+	if msiz != speculativeLength {
+		for i := 0; i < msiz-speculativeLength; i++ {
+			b = append(b, 0)
+		}
+		copy(b[pos+msiz:], b[pos+speculativeLength:])
+		b = b[:pos+msiz+mlen]
+	}
+	protowire.AppendVarint(b[:pos], uint64(mlen))
+	return b
+}
diff --git a/vendor/google.golang.org/protobuf/proto/encode_gen.go b/vendor/google.golang.org/protobuf/proto/encode_gen.go
new file mode 100644
index 0000000..185dacf
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/encode_gen.go
@@ -0,0 +1,97 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package proto
+
+import (
+	"math"
+	"unicode/utf8"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/strs"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+var wireTypes = map[protoreflect.Kind]protowire.Type{
+	protoreflect.BoolKind:     protowire.VarintType,
+	protoreflect.EnumKind:     protowire.VarintType,
+	protoreflect.Int32Kind:    protowire.VarintType,
+	protoreflect.Sint32Kind:   protowire.VarintType,
+	protoreflect.Uint32Kind:   protowire.VarintType,
+	protoreflect.Int64Kind:    protowire.VarintType,
+	protoreflect.Sint64Kind:   protowire.VarintType,
+	protoreflect.Uint64Kind:   protowire.VarintType,
+	protoreflect.Sfixed32Kind: protowire.Fixed32Type,
+	protoreflect.Fixed32Kind:  protowire.Fixed32Type,
+	protoreflect.FloatKind:    protowire.Fixed32Type,
+	protoreflect.Sfixed64Kind: protowire.Fixed64Type,
+	protoreflect.Fixed64Kind:  protowire.Fixed64Type,
+	protoreflect.DoubleKind:   protowire.Fixed64Type,
+	protoreflect.StringKind:   protowire.BytesType,
+	protoreflect.BytesKind:    protowire.BytesType,
+	protoreflect.MessageKind:  protowire.BytesType,
+	protoreflect.GroupKind:    protowire.StartGroupType,
+}
+
+func (o MarshalOptions) marshalSingular(b []byte, fd protoreflect.FieldDescriptor, v protoreflect.Value) ([]byte, error) {
+	switch fd.Kind() {
+	case protoreflect.BoolKind:
+		b = protowire.AppendVarint(b, protowire.EncodeBool(v.Bool()))
+	case protoreflect.EnumKind:
+		b = protowire.AppendVarint(b, uint64(v.Enum()))
+	case protoreflect.Int32Kind:
+		b = protowire.AppendVarint(b, uint64(int32(v.Int())))
+	case protoreflect.Sint32Kind:
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(int64(int32(v.Int()))))
+	case protoreflect.Uint32Kind:
+		b = protowire.AppendVarint(b, uint64(uint32(v.Uint())))
+	case protoreflect.Int64Kind:
+		b = protowire.AppendVarint(b, uint64(v.Int()))
+	case protoreflect.Sint64Kind:
+		b = protowire.AppendVarint(b, protowire.EncodeZigZag(v.Int()))
+	case protoreflect.Uint64Kind:
+		b = protowire.AppendVarint(b, v.Uint())
+	case protoreflect.Sfixed32Kind:
+		b = protowire.AppendFixed32(b, uint32(v.Int()))
+	case protoreflect.Fixed32Kind:
+		b = protowire.AppendFixed32(b, uint32(v.Uint()))
+	case protoreflect.FloatKind:
+		b = protowire.AppendFixed32(b, math.Float32bits(float32(v.Float())))
+	case protoreflect.Sfixed64Kind:
+		b = protowire.AppendFixed64(b, uint64(v.Int()))
+	case protoreflect.Fixed64Kind:
+		b = protowire.AppendFixed64(b, v.Uint())
+	case protoreflect.DoubleKind:
+		b = protowire.AppendFixed64(b, math.Float64bits(v.Float()))
+	case protoreflect.StringKind:
+		if strs.EnforceUTF8(fd) && !utf8.ValidString(v.String()) {
+			return b, errors.InvalidUTF8(string(fd.FullName()))
+		}
+		b = protowire.AppendString(b, v.String())
+	case protoreflect.BytesKind:
+		b = protowire.AppendBytes(b, v.Bytes())
+	case protoreflect.MessageKind:
+		var pos int
+		var err error
+		b, pos = appendSpeculativeLength(b)
+		b, err = o.marshalMessage(b, v.Message())
+		if err != nil {
+			return b, err
+		}
+		b = finishSpeculativeLength(b, pos)
+	case protoreflect.GroupKind:
+		var err error
+		b, err = o.marshalMessage(b, v.Message())
+		if err != nil {
+			return b, err
+		}
+		b = protowire.AppendVarint(b, protowire.EncodeTag(fd.Number(), protowire.EndGroupType))
+	default:
+		return b, errors.New("invalid kind %v", fd.Kind())
+	}
+	return b, nil
+}
diff --git a/vendor/google.golang.org/protobuf/proto/equal.go b/vendor/google.golang.org/protobuf/proto/equal.go
new file mode 100644
index 0000000..10902bd
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/equal.go
@@ -0,0 +1,154 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"bytes"
+	"math"
+	"reflect"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Equal reports whether two messages are equal.
+// If two messages marshal to the same bytes under deterministic serialization,
+// then Equal is guaranteed to report true.
+//
+// Two messages are equal if they belong to the same message descriptor,
+// have the same set of populated known and extension field values,
+// and the same set of unknown fields values. If either of the top-level
+// messages are invalid, then Equal reports true only if both are invalid.
+//
+// Scalar values are compared with the equivalent of the == operator in Go,
+// except bytes values which are compared using bytes.Equal and
+// floating point values which specially treat NaNs as equal.
+// Message values are compared by recursively calling Equal.
+// Lists are equal if each element value is also equal.
+// Maps are equal if they have the same set of keys, where the pair of values
+// for each key is also equal.
+func Equal(x, y Message) bool {
+	if x == nil || y == nil {
+		return x == nil && y == nil
+	}
+	mx := x.ProtoReflect()
+	my := y.ProtoReflect()
+	if mx.IsValid() != my.IsValid() {
+		return false
+	}
+	return equalMessage(mx, my)
+}
+
+// equalMessage compares two messages.
+func equalMessage(mx, my pref.Message) bool {
+	if mx.Descriptor() != my.Descriptor() {
+		return false
+	}
+
+	nx := 0
+	equal := true
+	mx.Range(func(fd pref.FieldDescriptor, vx pref.Value) bool {
+		nx++
+		vy := my.Get(fd)
+		equal = my.Has(fd) && equalField(fd, vx, vy)
+		return equal
+	})
+	if !equal {
+		return false
+	}
+	ny := 0
+	my.Range(func(fd pref.FieldDescriptor, vx pref.Value) bool {
+		ny++
+		return true
+	})
+	if nx != ny {
+		return false
+	}
+
+	return equalUnknown(mx.GetUnknown(), my.GetUnknown())
+}
+
+// equalField compares two fields.
+func equalField(fd pref.FieldDescriptor, x, y pref.Value) bool {
+	switch {
+	case fd.IsList():
+		return equalList(fd, x.List(), y.List())
+	case fd.IsMap():
+		return equalMap(fd, x.Map(), y.Map())
+	default:
+		return equalValue(fd, x, y)
+	}
+}
+
+// equalMap compares two maps.
+func equalMap(fd pref.FieldDescriptor, x, y pref.Map) bool {
+	if x.Len() != y.Len() {
+		return false
+	}
+	equal := true
+	x.Range(func(k pref.MapKey, vx pref.Value) bool {
+		vy := y.Get(k)
+		equal = y.Has(k) && equalValue(fd.MapValue(), vx, vy)
+		return equal
+	})
+	return equal
+}
+
+// equalList compares two lists.
+func equalList(fd pref.FieldDescriptor, x, y pref.List) bool {
+	if x.Len() != y.Len() {
+		return false
+	}
+	for i := x.Len() - 1; i >= 0; i-- {
+		if !equalValue(fd, x.Get(i), y.Get(i)) {
+			return false
+		}
+	}
+	return true
+}
+
+// equalValue compares two singular values.
+func equalValue(fd pref.FieldDescriptor, x, y pref.Value) bool {
+	switch {
+	case fd.Message() != nil:
+		return equalMessage(x.Message(), y.Message())
+	case fd.Kind() == pref.BytesKind:
+		return bytes.Equal(x.Bytes(), y.Bytes())
+	case fd.Kind() == pref.FloatKind, fd.Kind() == pref.DoubleKind:
+		fx := x.Float()
+		fy := y.Float()
+		if math.IsNaN(fx) || math.IsNaN(fy) {
+			return math.IsNaN(fx) && math.IsNaN(fy)
+		}
+		return fx == fy
+	default:
+		return x.Interface() == y.Interface()
+	}
+}
+
+// equalUnknown compares unknown fields by direct comparison on the raw bytes
+// of each individual field number.
+func equalUnknown(x, y pref.RawFields) bool {
+	if len(x) != len(y) {
+		return false
+	}
+	if bytes.Equal([]byte(x), []byte(y)) {
+		return true
+	}
+
+	mx := make(map[pref.FieldNumber]pref.RawFields)
+	my := make(map[pref.FieldNumber]pref.RawFields)
+	for len(x) > 0 {
+		fnum, _, n := protowire.ConsumeField(x)
+		mx[fnum] = append(mx[fnum], x[:n]...)
+		x = x[n:]
+	}
+	for len(y) > 0 {
+		fnum, _, n := protowire.ConsumeField(y)
+		my[fnum] = append(my[fnum], y[:n]...)
+		y = y[n:]
+	}
+	return reflect.DeepEqual(mx, my)
+}
diff --git a/vendor/google.golang.org/protobuf/proto/extension.go b/vendor/google.golang.org/protobuf/proto/extension.go
new file mode 100644
index 0000000..5f293cd
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/extension.go
@@ -0,0 +1,92 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// HasExtension reports whether an extension field is populated.
+// It returns false if m is invalid or if xt does not extend m.
+func HasExtension(m Message, xt protoreflect.ExtensionType) bool {
+	// Treat nil message interface as an empty message; no populated fields.
+	if m == nil {
+		return false
+	}
+
+	// As a special-case, we reports invalid or mismatching descriptors
+	// as always not being populated (since they aren't).
+	if xt == nil || m.ProtoReflect().Descriptor() != xt.TypeDescriptor().ContainingMessage() {
+		return false
+	}
+
+	return m.ProtoReflect().Has(xt.TypeDescriptor())
+}
+
+// ClearExtension clears an extension field such that subsequent
+// HasExtension calls return false.
+// It panics if m is invalid or if xt does not extend m.
+func ClearExtension(m Message, xt protoreflect.ExtensionType) {
+	m.ProtoReflect().Clear(xt.TypeDescriptor())
+}
+
+// GetExtension retrieves the value for an extension field.
+// If the field is unpopulated, it returns the default value for
+// scalars and an immutable, empty value for lists or messages.
+// It panics if xt does not extend m.
+func GetExtension(m Message, xt protoreflect.ExtensionType) interface{} {
+	// Treat nil message interface as an empty message; return the default.
+	if m == nil {
+		return xt.InterfaceOf(xt.Zero())
+	}
+
+	return xt.InterfaceOf(m.ProtoReflect().Get(xt.TypeDescriptor()))
+}
+
+// SetExtension stores the value of an extension field.
+// It panics if m is invalid, xt does not extend m, or if type of v
+// is invalid for the specified extension field.
+func SetExtension(m Message, xt protoreflect.ExtensionType, v interface{}) {
+	xd := xt.TypeDescriptor()
+	pv := xt.ValueOf(v)
+
+	// Specially treat an invalid list, map, or message as clear.
+	isValid := true
+	switch {
+	case xd.IsList():
+		isValid = pv.List().IsValid()
+	case xd.IsMap():
+		isValid = pv.Map().IsValid()
+	case xd.Message() != nil:
+		isValid = pv.Message().IsValid()
+	}
+	if !isValid {
+		m.ProtoReflect().Clear(xd)
+		return
+	}
+
+	m.ProtoReflect().Set(xd, pv)
+}
+
+// RangeExtensions iterates over every populated extension field in m in an
+// undefined order, calling f for each extension type and value encountered.
+// It returns immediately if f returns false.
+// While iterating, mutating operations may only be performed
+// on the current extension field.
+func RangeExtensions(m Message, f func(protoreflect.ExtensionType, interface{}) bool) {
+	// Treat nil message interface as an empty message; nothing to range over.
+	if m == nil {
+		return
+	}
+
+	m.ProtoReflect().Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		if fd.IsExtension() {
+			xt := fd.(protoreflect.ExtensionTypeDescriptor).Type()
+			vi := xt.InterfaceOf(v)
+			return f(xt, vi)
+		}
+		return true
+	})
+}
diff --git a/vendor/google.golang.org/protobuf/proto/merge.go b/vendor/google.golang.org/protobuf/proto/merge.go
new file mode 100644
index 0000000..d761ab3
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/merge.go
@@ -0,0 +1,139 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"fmt"
+
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+// Merge merges src into dst, which must be a message with the same descriptor.
+//
+// Populated scalar fields in src are copied to dst, while populated
+// singular messages in src are merged into dst by recursively calling Merge.
+// The elements of every list field in src is appended to the corresponded
+// list fields in dst. The entries of every map field in src is copied into
+// the corresponding map field in dst, possibly replacing existing entries.
+// The unknown fields of src are appended to the unknown fields of dst.
+//
+// It is semantically equivalent to unmarshaling the encoded form of src
+// into dst with the UnmarshalOptions.Merge option specified.
+func Merge(dst, src Message) {
+	// TODO: Should nil src be treated as semantically equivalent to a
+	// untyped, read-only, empty message? What about a nil dst?
+
+	dstMsg, srcMsg := dst.ProtoReflect(), src.ProtoReflect()
+	if dstMsg.Descriptor() != srcMsg.Descriptor() {
+		if got, want := dstMsg.Descriptor().FullName(), srcMsg.Descriptor().FullName(); got != want {
+			panic(fmt.Sprintf("descriptor mismatch: %v != %v", got, want))
+		}
+		panic("descriptor mismatch")
+	}
+	mergeOptions{}.mergeMessage(dstMsg, srcMsg)
+}
+
+// Clone returns a deep copy of m.
+// If the top-level message is invalid, it returns an invalid message as well.
+func Clone(m Message) Message {
+	// NOTE: Most usages of Clone assume the following properties:
+	//	t := reflect.TypeOf(m)
+	//	t == reflect.TypeOf(m.ProtoReflect().New().Interface())
+	//	t == reflect.TypeOf(m.ProtoReflect().Type().Zero().Interface())
+	//
+	// Embedding protobuf messages breaks this since the parent type will have
+	// a forwarded ProtoReflect method, but the Interface method will return
+	// the underlying embedded message type.
+	if m == nil {
+		return nil
+	}
+	src := m.ProtoReflect()
+	if !src.IsValid() {
+		return src.Type().Zero().Interface()
+	}
+	dst := src.New()
+	mergeOptions{}.mergeMessage(dst, src)
+	return dst.Interface()
+}
+
+// mergeOptions provides a namespace for merge functions, and can be
+// exported in the future if we add user-visible merge options.
+type mergeOptions struct{}
+
+func (o mergeOptions) mergeMessage(dst, src protoreflect.Message) {
+	methods := protoMethods(dst)
+	if methods != nil && methods.Merge != nil {
+		in := protoiface.MergeInput{
+			Destination: dst,
+			Source:      src,
+		}
+		out := methods.Merge(in)
+		if out.Flags&protoiface.MergeComplete != 0 {
+			return
+		}
+	}
+
+	if !dst.IsValid() {
+		panic(fmt.Sprintf("cannot merge into invalid %v message", dst.Descriptor().FullName()))
+	}
+
+	src.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		switch {
+		case fd.IsList():
+			o.mergeList(dst.Mutable(fd).List(), v.List(), fd)
+		case fd.IsMap():
+			o.mergeMap(dst.Mutable(fd).Map(), v.Map(), fd.MapValue())
+		case fd.Message() != nil:
+			o.mergeMessage(dst.Mutable(fd).Message(), v.Message())
+		case fd.Kind() == protoreflect.BytesKind:
+			dst.Set(fd, o.cloneBytes(v))
+		default:
+			dst.Set(fd, v)
+		}
+		return true
+	})
+
+	if len(src.GetUnknown()) > 0 {
+		dst.SetUnknown(append(dst.GetUnknown(), src.GetUnknown()...))
+	}
+}
+
+func (o mergeOptions) mergeList(dst, src protoreflect.List, fd protoreflect.FieldDescriptor) {
+	// Merge semantics appends to the end of the existing list.
+	for i, n := 0, src.Len(); i < n; i++ {
+		switch v := src.Get(i); {
+		case fd.Message() != nil:
+			dstv := dst.NewElement()
+			o.mergeMessage(dstv.Message(), v.Message())
+			dst.Append(dstv)
+		case fd.Kind() == protoreflect.BytesKind:
+			dst.Append(o.cloneBytes(v))
+		default:
+			dst.Append(v)
+		}
+	}
+}
+
+func (o mergeOptions) mergeMap(dst, src protoreflect.Map, fd protoreflect.FieldDescriptor) {
+	// Merge semantics replaces, rather than merges into existing entries.
+	src.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
+		switch {
+		case fd.Message() != nil:
+			dstv := dst.NewValue()
+			o.mergeMessage(dstv.Message(), v.Message())
+			dst.Set(k, dstv)
+		case fd.Kind() == protoreflect.BytesKind:
+			dst.Set(k, o.cloneBytes(v))
+		default:
+			dst.Set(k, v)
+		}
+		return true
+	})
+}
+
+func (o mergeOptions) cloneBytes(v protoreflect.Value) protoreflect.Value {
+	return protoreflect.ValueOfBytes(append([]byte{}, v.Bytes()...))
+}
diff --git a/vendor/google.golang.org/protobuf/proto/messageset.go b/vendor/google.golang.org/protobuf/proto/messageset.go
new file mode 100644
index 0000000..b6b3de5
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/messageset.go
@@ -0,0 +1,88 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+func sizeMessageSet(m protoreflect.Message) (size int) {
+	m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		size += messageset.SizeField(fd.Number())
+		size += protowire.SizeTag(messageset.FieldMessage)
+		size += protowire.SizeBytes(sizeMessage(v.Message()))
+		return true
+	})
+	size += messageset.SizeUnknown(m.GetUnknown())
+	return size
+}
+
+func marshalMessageSet(b []byte, m protoreflect.Message, o MarshalOptions) ([]byte, error) {
+	if !flags.ProtoLegacy {
+		return b, errors.New("no support for message_set_wire_format")
+	}
+	var err error
+	o.rangeFields(m, func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		b, err = marshalMessageSetField(b, fd, v, o)
+		return err == nil
+	})
+	if err != nil {
+		return b, err
+	}
+	return messageset.AppendUnknown(b, m.GetUnknown())
+}
+
+func marshalMessageSetField(b []byte, fd protoreflect.FieldDescriptor, value protoreflect.Value, o MarshalOptions) ([]byte, error) {
+	b = messageset.AppendFieldStart(b, fd.Number())
+	b = protowire.AppendTag(b, messageset.FieldMessage, protowire.BytesType)
+	b = protowire.AppendVarint(b, uint64(o.Size(value.Message().Interface())))
+	b, err := o.marshalMessage(b, value.Message())
+	if err != nil {
+		return b, err
+	}
+	b = messageset.AppendFieldEnd(b)
+	return b, nil
+}
+
+func unmarshalMessageSet(b []byte, m protoreflect.Message, o UnmarshalOptions) error {
+	if !flags.ProtoLegacy {
+		return errors.New("no support for message_set_wire_format")
+	}
+	return messageset.Unmarshal(b, false, func(num protowire.Number, v []byte) error {
+		err := unmarshalMessageSetField(m, num, v, o)
+		if err == errUnknown {
+			unknown := m.GetUnknown()
+			unknown = protowire.AppendTag(unknown, num, protowire.BytesType)
+			unknown = protowire.AppendBytes(unknown, v)
+			m.SetUnknown(unknown)
+			return nil
+		}
+		return err
+	})
+}
+
+func unmarshalMessageSetField(m protoreflect.Message, num protowire.Number, v []byte, o UnmarshalOptions) error {
+	md := m.Descriptor()
+	if !md.ExtensionRanges().Has(num) {
+		return errUnknown
+	}
+	xt, err := o.Resolver.FindExtensionByNumber(md.FullName(), num)
+	if err == protoregistry.NotFound {
+		return errUnknown
+	}
+	if err != nil {
+		return errors.New("%v: unable to resolve extension %v: %v", md.FullName(), num, err)
+	}
+	xd := xt.TypeDescriptor()
+	if err := o.unmarshalMessage(v, m.Mutable(xd).Message()); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/vendor/google.golang.org/protobuf/proto/proto.go b/vendor/google.golang.org/protobuf/proto/proto.go
new file mode 100644
index 0000000..ca14b09
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/proto.go
@@ -0,0 +1,34 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Message is the top-level interface that all messages must implement.
+// It provides access to a reflective view of a message.
+// Any implementation of this interface may be used with all functions in the
+// protobuf module that accept a Message, except where otherwise specified.
+//
+// This is the v2 interface definition for protobuf messages.
+// The v1 interface definition is "github.com/golang/protobuf/proto".Message.
+//
+// To convert a v1 message to a v2 message,
+// use "github.com/golang/protobuf/proto".MessageV2.
+// To convert a v2 message to a v1 message,
+// use "github.com/golang/protobuf/proto".MessageV1.
+type Message = protoreflect.ProtoMessage
+
+// Error matches all errors produced by packages in the protobuf module.
+//
+// That is, errors.Is(err, Error) reports whether an error is produced
+// by this module.
+var Error error
+
+func init() {
+	Error = errors.Error
+}
diff --git a/vendor/google.golang.org/protobuf/proto/proto_methods.go b/vendor/google.golang.org/protobuf/proto/proto_methods.go
new file mode 100644
index 0000000..d8dd604
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/proto_methods.go
@@ -0,0 +1,19 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The protoreflect build tag disables use of fast-path methods.
+// +build !protoreflect
+
+package proto
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+const hasProtoMethods = true
+
+func protoMethods(m protoreflect.Message) *protoiface.Methods {
+	return m.ProtoMethods()
+}
diff --git a/vendor/google.golang.org/protobuf/proto/proto_reflect.go b/vendor/google.golang.org/protobuf/proto/proto_reflect.go
new file mode 100644
index 0000000..b103d43
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/proto_reflect.go
@@ -0,0 +1,19 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The protoreflect build tag disables use of fast-path methods.
+// +build protoreflect
+
+package proto
+
+import (
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+const hasProtoMethods = false
+
+func protoMethods(m protoreflect.Message) *protoiface.Methods {
+	return nil
+}
diff --git a/vendor/google.golang.org/protobuf/proto/reset.go b/vendor/google.golang.org/protobuf/proto/reset.go
new file mode 100644
index 0000000..3d7f894
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/reset.go
@@ -0,0 +1,43 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"fmt"
+
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Reset clears every field in the message.
+// The resulting message shares no observable memory with its previous state
+// other than the memory for the message itself.
+func Reset(m Message) {
+	if mr, ok := m.(interface{ Reset() }); ok && hasProtoMethods {
+		mr.Reset()
+		return
+	}
+	resetMessage(m.ProtoReflect())
+}
+
+func resetMessage(m protoreflect.Message) {
+	if !m.IsValid() {
+		panic(fmt.Sprintf("cannot reset invalid %v message", m.Descriptor().FullName()))
+	}
+
+	// Clear all known fields.
+	fds := m.Descriptor().Fields()
+	for i := 0; i < fds.Len(); i++ {
+		m.Clear(fds.Get(i))
+	}
+
+	// Clear extension fields.
+	m.Range(func(fd protoreflect.FieldDescriptor, _ protoreflect.Value) bool {
+		m.Clear(fd)
+		return true
+	})
+
+	// Clear unknown fields.
+	m.SetUnknown(nil)
+}
diff --git a/vendor/google.golang.org/protobuf/proto/size.go b/vendor/google.golang.org/protobuf/proto/size.go
new file mode 100644
index 0000000..11ba841
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/size.go
@@ -0,0 +1,94 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/encoding/messageset"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protoiface"
+)
+
+// Size returns the size in bytes of the wire-format encoding of m.
+func Size(m Message) int {
+	return MarshalOptions{}.Size(m)
+}
+
+// Size returns the size in bytes of the wire-format encoding of m.
+func (o MarshalOptions) Size(m Message) int {
+	// Treat a nil message interface as an empty message; nothing to output.
+	if m == nil {
+		return 0
+	}
+
+	return sizeMessage(m.ProtoReflect())
+}
+
+func sizeMessage(m protoreflect.Message) (size int) {
+	methods := protoMethods(m)
+	if methods != nil && methods.Size != nil {
+		out := methods.Size(protoiface.SizeInput{
+			Message: m,
+		})
+		return out.Size
+	}
+	if methods != nil && methods.Marshal != nil {
+		// This is not efficient, but we don't have any choice.
+		// This case is mainly used for legacy types with a Marshal method.
+		out, _ := methods.Marshal(protoiface.MarshalInput{
+			Message: m,
+		})
+		return len(out.Buf)
+	}
+	return sizeMessageSlow(m)
+}
+
+func sizeMessageSlow(m protoreflect.Message) (size int) {
+	if messageset.IsMessageSet(m.Descriptor()) {
+		return sizeMessageSet(m)
+	}
+	m.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		size += sizeField(fd, v)
+		return true
+	})
+	size += len(m.GetUnknown())
+	return size
+}
+
+func sizeField(fd protoreflect.FieldDescriptor, value protoreflect.Value) (size int) {
+	num := fd.Number()
+	switch {
+	case fd.IsList():
+		return sizeList(num, fd, value.List())
+	case fd.IsMap():
+		return sizeMap(num, fd, value.Map())
+	default:
+		return protowire.SizeTag(num) + sizeSingular(num, fd.Kind(), value)
+	}
+}
+
+func sizeList(num protowire.Number, fd protoreflect.FieldDescriptor, list protoreflect.List) (size int) {
+	if fd.IsPacked() && list.Len() > 0 {
+		content := 0
+		for i, llen := 0, list.Len(); i < llen; i++ {
+			content += sizeSingular(num, fd.Kind(), list.Get(i))
+		}
+		return protowire.SizeTag(num) + protowire.SizeBytes(content)
+	}
+
+	for i, llen := 0, list.Len(); i < llen; i++ {
+		size += protowire.SizeTag(num) + sizeSingular(num, fd.Kind(), list.Get(i))
+	}
+	return size
+}
+
+func sizeMap(num protowire.Number, fd protoreflect.FieldDescriptor, mapv protoreflect.Map) (size int) {
+	mapv.Range(func(key protoreflect.MapKey, value protoreflect.Value) bool {
+		size += protowire.SizeTag(num)
+		size += protowire.SizeBytes(sizeField(fd.MapKey(), key.Value()) + sizeField(fd.MapValue(), value))
+		return true
+	})
+	return size
+}
diff --git a/vendor/google.golang.org/protobuf/proto/size_gen.go b/vendor/google.golang.org/protobuf/proto/size_gen.go
new file mode 100644
index 0000000..1118460
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/size_gen.go
@@ -0,0 +1,55 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by generate-types. DO NOT EDIT.
+
+package proto
+
+import (
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+func sizeSingular(num protowire.Number, kind protoreflect.Kind, v protoreflect.Value) int {
+	switch kind {
+	case protoreflect.BoolKind:
+		return protowire.SizeVarint(protowire.EncodeBool(v.Bool()))
+	case protoreflect.EnumKind:
+		return protowire.SizeVarint(uint64(v.Enum()))
+	case protoreflect.Int32Kind:
+		return protowire.SizeVarint(uint64(int32(v.Int())))
+	case protoreflect.Sint32Kind:
+		return protowire.SizeVarint(protowire.EncodeZigZag(int64(int32(v.Int()))))
+	case protoreflect.Uint32Kind:
+		return protowire.SizeVarint(uint64(uint32(v.Uint())))
+	case protoreflect.Int64Kind:
+		return protowire.SizeVarint(uint64(v.Int()))
+	case protoreflect.Sint64Kind:
+		return protowire.SizeVarint(protowire.EncodeZigZag(v.Int()))
+	case protoreflect.Uint64Kind:
+		return protowire.SizeVarint(v.Uint())
+	case protoreflect.Sfixed32Kind:
+		return protowire.SizeFixed32()
+	case protoreflect.Fixed32Kind:
+		return protowire.SizeFixed32()
+	case protoreflect.FloatKind:
+		return protowire.SizeFixed32()
+	case protoreflect.Sfixed64Kind:
+		return protowire.SizeFixed64()
+	case protoreflect.Fixed64Kind:
+		return protowire.SizeFixed64()
+	case protoreflect.DoubleKind:
+		return protowire.SizeFixed64()
+	case protoreflect.StringKind:
+		return protowire.SizeBytes(len(v.String()))
+	case protoreflect.BytesKind:
+		return protowire.SizeBytes(len(v.Bytes()))
+	case protoreflect.MessageKind:
+		return protowire.SizeBytes(sizeMessage(v.Message()))
+	case protoreflect.GroupKind:
+		return protowire.SizeGroup(num, sizeMessage(v.Message()))
+	default:
+		return 0
+	}
+}
diff --git a/vendor/google.golang.org/protobuf/proto/wrappers.go b/vendor/google.golang.org/protobuf/proto/wrappers.go
new file mode 100644
index 0000000..653b12c
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/proto/wrappers.go
@@ -0,0 +1,29 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+// Bool stores v in a new bool value and returns a pointer to it.
+func Bool(v bool) *bool { return &v }
+
+// Int32 stores v in a new int32 value and returns a pointer to it.
+func Int32(v int32) *int32 { return &v }
+
+// Int64 stores v in a new int64 value and returns a pointer to it.
+func Int64(v int64) *int64 { return &v }
+
+// Float32 stores v in a new float32 value and returns a pointer to it.
+func Float32(v float32) *float32 { return &v }
+
+// Float64 stores v in a new float64 value and returns a pointer to it.
+func Float64(v float64) *float64 { return &v }
+
+// Uint32 stores v in a new uint32 value and returns a pointer to it.
+func Uint32(v uint32) *uint32 { return &v }
+
+// Uint64 stores v in a new uint64 value and returns a pointer to it.
+func Uint64(v uint64) *uint64 { return &v }
+
+// String stores v in a new string value and returns a pointer to it.
+func String(v string) *string { return &v }
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/methods.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/methods.go
new file mode 100644
index 0000000..6be5d16
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/methods.go
@@ -0,0 +1,77 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoreflect
+
+import (
+	"google.golang.org/protobuf/internal/pragma"
+)
+
+// The following types are used by the fast-path Message.ProtoMethods method.
+//
+// To avoid polluting the public protoreflect API with types used only by
+// low-level implementations, the canonical definitions of these types are
+// in the runtime/protoiface package. The definitions here and in protoiface
+// must be kept in sync.
+type (
+	methods = struct {
+		pragma.NoUnkeyedLiterals
+		Flags            supportFlags
+		Size             func(sizeInput) sizeOutput
+		Marshal          func(marshalInput) (marshalOutput, error)
+		Unmarshal        func(unmarshalInput) (unmarshalOutput, error)
+		Merge            func(mergeInput) mergeOutput
+		CheckInitialized func(checkInitializedInput) (checkInitializedOutput, error)
+	}
+	supportFlags = uint64
+	sizeInput    = struct {
+		pragma.NoUnkeyedLiterals
+		Message Message
+		Flags   uint8
+	}
+	sizeOutput = struct {
+		pragma.NoUnkeyedLiterals
+		Size int
+	}
+	marshalInput = struct {
+		pragma.NoUnkeyedLiterals
+		Message Message
+		Buf     []byte
+		Flags   uint8
+	}
+	marshalOutput = struct {
+		pragma.NoUnkeyedLiterals
+		Buf []byte
+	}
+	unmarshalInput = struct {
+		pragma.NoUnkeyedLiterals
+		Message  Message
+		Buf      []byte
+		Flags    uint8
+		Resolver interface {
+			FindExtensionByName(field FullName) (ExtensionType, error)
+			FindExtensionByNumber(message FullName, field FieldNumber) (ExtensionType, error)
+		}
+	}
+	unmarshalOutput = struct {
+		pragma.NoUnkeyedLiterals
+		Flags uint8
+	}
+	mergeInput = struct {
+		pragma.NoUnkeyedLiterals
+		Source      Message
+		Destination Message
+	}
+	mergeOutput = struct {
+		pragma.NoUnkeyedLiterals
+		Flags uint8
+	}
+	checkInitializedInput = struct {
+		pragma.NoUnkeyedLiterals
+		Message Message
+	}
+	checkInitializedOutput = struct {
+		pragma.NoUnkeyedLiterals
+	}
+)
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/proto.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/proto.go
new file mode 100644
index 0000000..b669a4e
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/proto.go
@@ -0,0 +1,478 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protoreflect provides interfaces to dynamically manipulate messages.
+//
+// This package includes type descriptors which describe the structure of types
+// defined in proto source files and value interfaces which provide the
+// ability to examine and manipulate the contents of messages.
+//
+//
+// Protocol Buffer Descriptors
+//
+// Protobuf descriptors (e.g., EnumDescriptor or MessageDescriptor)
+// are immutable objects that represent protobuf type information.
+// They are wrappers around the messages declared in descriptor.proto.
+// Protobuf descriptors alone lack any information regarding Go types.
+//
+// Enums and messages generated by this module implement Enum and ProtoMessage,
+// where the Descriptor and ProtoReflect.Descriptor accessors respectively
+// return the protobuf descriptor for the values.
+//
+// The protobuf descriptor interfaces are not meant to be implemented by
+// user code since they might need to be extended in the future to support
+// additions to the protobuf language.
+// The "google.golang.org/protobuf/reflect/protodesc" package converts between
+// google.protobuf.DescriptorProto messages and protobuf descriptors.
+//
+//
+// Go Type Descriptors
+//
+// A type descriptor (e.g., EnumType or MessageType) is a constructor for
+// a concrete Go type that represents the associated protobuf descriptor.
+// There is commonly a one-to-one relationship between protobuf descriptors and
+// Go type descriptors, but it can potentially be a one-to-many relationship.
+//
+// Enums and messages generated by this module implement Enum and ProtoMessage,
+// where the Type and ProtoReflect.Type accessors respectively
+// return the protobuf descriptor for the values.
+//
+// The "google.golang.org/protobuf/types/dynamicpb" package can be used to
+// create Go type descriptors from protobuf descriptors.
+//
+//
+// Value Interfaces
+//
+// The Enum and Message interfaces provide a reflective view over an
+// enum or message instance. For enums, it provides the ability to retrieve
+// the enum value number for any concrete enum type. For messages, it provides
+// the ability to access or manipulate fields of the message.
+//
+// To convert a proto.Message to a protoreflect.Message, use the
+// former's ProtoReflect method. Since the ProtoReflect method is new to the
+// v2 message interface, it may not be present on older message implementations.
+// The "github.com/golang/protobuf/proto".MessageReflect function can be used
+// to obtain a reflective view on older messages.
+//
+//
+// Relationships
+//
+// The following diagrams demonstrate the relationships between
+// various types declared in this package.
+//
+//
+//	                       ┌───────────────────────────────────┐
+//	                       V                                   │
+//	   ┌────────────── New(n) ─────────────┐                   │
+//	   │                                   │                   │
+//	   │      ┌──── Descriptor() ──┐       │  ┌── Number() ──┐ │
+//	   │      │                    V       V  │              V │
+//	╔════════════╗  ╔════════════════╗  ╔════════╗  ╔════════════╗
+//	║  EnumType  ║  ║ EnumDescriptor ║  ║  Enum  ║  ║ EnumNumber ║
+//	╚════════════╝  ╚════════════════╝  ╚════════╝  ╚════════════╝
+//	      Λ           Λ                   │ │
+//	      │           └─── Descriptor() ──┘ │
+//	      │                                 │
+//	      └────────────────── Type() ───────┘
+//
+// • An EnumType describes a concrete Go enum type.
+// It has an EnumDescriptor and can construct an Enum instance.
+//
+// • An EnumDescriptor describes an abstract protobuf enum type.
+//
+// • An Enum is a concrete enum instance. Generated enums implement Enum.
+//
+//
+//	  ┌──────────────── New() ─────────────────┐
+//	  │                                        │
+//	  │         ┌─── Descriptor() ─────┐       │   ┌── Interface() ───┐
+//	  │         │                      V       V   │                  V
+//	╔═════════════╗  ╔═══════════════════╗  ╔═════════╗  ╔══════════════╗
+//	║ MessageType ║  ║ MessageDescriptor ║  ║ Message ║  ║ ProtoMessage ║
+//	╚═════════════╝  ╚═══════════════════╝  ╚═════════╝  ╚══════════════╝
+//	       Λ           Λ                      │ │  Λ                  │
+//	       │           └──── Descriptor() ────┘ │  └─ ProtoReflect() ─┘
+//	       │                                    │
+//	       └─────────────────── Type() ─────────┘
+//
+// • A MessageType describes a concrete Go message type.
+// It has a MessageDescriptor and can construct a Message instance.
+//
+// • A MessageDescriptor describes an abstract protobuf message type.
+//
+// • A Message is a concrete message instance. Generated messages implement
+// ProtoMessage, which can convert to/from a Message.
+//
+//
+//	      ┌── TypeDescriptor() ──┐    ┌───── Descriptor() ─────┐
+//	      │                      V    │                        V
+//	╔═══════════════╗  ╔═════════════════════════╗  ╔═════════════════════╗
+//	║ ExtensionType ║  ║ ExtensionTypeDescriptor ║  ║ ExtensionDescriptor ║
+//	╚═══════════════╝  ╚═════════════════════════╝  ╚═════════════════════╝
+//	      Λ                      │   │ Λ                      │ Λ
+//	      └─────── Type() ───────┘   │ └─── may implement ────┘ │
+//	                                 │                          │
+//	                                 └────── implements ────────┘
+//
+// • An ExtensionType describes a concrete Go implementation of an extension.
+// It has an ExtensionTypeDescriptor and can convert to/from
+// abstract Values and Go values.
+//
+// • An ExtensionTypeDescriptor is an ExtensionDescriptor
+// which also has an ExtensionType.
+//
+// • An ExtensionDescriptor describes an abstract protobuf extension field and
+// may not always be an ExtensionTypeDescriptor.
+package protoreflect
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"google.golang.org/protobuf/encoding/protowire"
+	"google.golang.org/protobuf/internal/pragma"
+)
+
+type doNotImplement pragma.DoNotImplement
+
+// ProtoMessage is the top-level interface that all proto messages implement.
+// This is declared in the protoreflect package to avoid a cyclic dependency;
+// use the proto.Message type instead, which aliases this type.
+type ProtoMessage interface{ ProtoReflect() Message }
+
+// Syntax is the language version of the proto file.
+type Syntax syntax
+
+type syntax int8 // keep exact type opaque as the int type may change
+
+const (
+	Proto2 Syntax = 2
+	Proto3 Syntax = 3
+)
+
+// IsValid reports whether the syntax is valid.
+func (s Syntax) IsValid() bool {
+	switch s {
+	case Proto2, Proto3:
+		return true
+	default:
+		return false
+	}
+}
+
+// String returns s as a proto source identifier (e.g., "proto2").
+func (s Syntax) String() string {
+	switch s {
+	case Proto2:
+		return "proto2"
+	case Proto3:
+		return "proto3"
+	default:
+		return fmt.Sprintf("<unknown:%d>", s)
+	}
+}
+
+// GoString returns s as a Go source identifier (e.g., "Proto2").
+func (s Syntax) GoString() string {
+	switch s {
+	case Proto2:
+		return "Proto2"
+	case Proto3:
+		return "Proto3"
+	default:
+		return fmt.Sprintf("Syntax(%d)", s)
+	}
+}
+
+// Cardinality determines whether a field is optional, required, or repeated.
+type Cardinality cardinality
+
+type cardinality int8 // keep exact type opaque as the int type may change
+
+// Constants as defined by the google.protobuf.Cardinality enumeration.
+const (
+	Optional Cardinality = 1 // appears zero or one times
+	Required Cardinality = 2 // appears exactly one time; invalid with Proto3
+	Repeated Cardinality = 3 // appears zero or more times
+)
+
+// IsValid reports whether the cardinality is valid.
+func (c Cardinality) IsValid() bool {
+	switch c {
+	case Optional, Required, Repeated:
+		return true
+	default:
+		return false
+	}
+}
+
+// String returns c as a proto source identifier (e.g., "optional").
+func (c Cardinality) String() string {
+	switch c {
+	case Optional:
+		return "optional"
+	case Required:
+		return "required"
+	case Repeated:
+		return "repeated"
+	default:
+		return fmt.Sprintf("<unknown:%d>", c)
+	}
+}
+
+// GoString returns c as a Go source identifier (e.g., "Optional").
+func (c Cardinality) GoString() string {
+	switch c {
+	case Optional:
+		return "Optional"
+	case Required:
+		return "Required"
+	case Repeated:
+		return "Repeated"
+	default:
+		return fmt.Sprintf("Cardinality(%d)", c)
+	}
+}
+
+// Kind indicates the basic proto kind of a field.
+type Kind kind
+
+type kind int8 // keep exact type opaque as the int type may change
+
+// Constants as defined by the google.protobuf.Field.Kind enumeration.
+const (
+	BoolKind     Kind = 8
+	EnumKind     Kind = 14
+	Int32Kind    Kind = 5
+	Sint32Kind   Kind = 17
+	Uint32Kind   Kind = 13
+	Int64Kind    Kind = 3
+	Sint64Kind   Kind = 18
+	Uint64Kind   Kind = 4
+	Sfixed32Kind Kind = 15
+	Fixed32Kind  Kind = 7
+	FloatKind    Kind = 2
+	Sfixed64Kind Kind = 16
+	Fixed64Kind  Kind = 6
+	DoubleKind   Kind = 1
+	StringKind   Kind = 9
+	BytesKind    Kind = 12
+	MessageKind  Kind = 11
+	GroupKind    Kind = 10
+)
+
+// IsValid reports whether the kind is valid.
+func (k Kind) IsValid() bool {
+	switch k {
+	case BoolKind, EnumKind,
+		Int32Kind, Sint32Kind, Uint32Kind,
+		Int64Kind, Sint64Kind, Uint64Kind,
+		Sfixed32Kind, Fixed32Kind, FloatKind,
+		Sfixed64Kind, Fixed64Kind, DoubleKind,
+		StringKind, BytesKind, MessageKind, GroupKind:
+		return true
+	default:
+		return false
+	}
+}
+
+// String returns k as a proto source identifier (e.g., "bool").
+func (k Kind) String() string {
+	switch k {
+	case BoolKind:
+		return "bool"
+	case EnumKind:
+		return "enum"
+	case Int32Kind:
+		return "int32"
+	case Sint32Kind:
+		return "sint32"
+	case Uint32Kind:
+		return "uint32"
+	case Int64Kind:
+		return "int64"
+	case Sint64Kind:
+		return "sint64"
+	case Uint64Kind:
+		return "uint64"
+	case Sfixed32Kind:
+		return "sfixed32"
+	case Fixed32Kind:
+		return "fixed32"
+	case FloatKind:
+		return "float"
+	case Sfixed64Kind:
+		return "sfixed64"
+	case Fixed64Kind:
+		return "fixed64"
+	case DoubleKind:
+		return "double"
+	case StringKind:
+		return "string"
+	case BytesKind:
+		return "bytes"
+	case MessageKind:
+		return "message"
+	case GroupKind:
+		return "group"
+	default:
+		return fmt.Sprintf("<unknown:%d>", k)
+	}
+}
+
+// GoString returns k as a Go source identifier (e.g., "BoolKind").
+func (k Kind) GoString() string {
+	switch k {
+	case BoolKind:
+		return "BoolKind"
+	case EnumKind:
+		return "EnumKind"
+	case Int32Kind:
+		return "Int32Kind"
+	case Sint32Kind:
+		return "Sint32Kind"
+	case Uint32Kind:
+		return "Uint32Kind"
+	case Int64Kind:
+		return "Int64Kind"
+	case Sint64Kind:
+		return "Sint64Kind"
+	case Uint64Kind:
+		return "Uint64Kind"
+	case Sfixed32Kind:
+		return "Sfixed32Kind"
+	case Fixed32Kind:
+		return "Fixed32Kind"
+	case FloatKind:
+		return "FloatKind"
+	case Sfixed64Kind:
+		return "Sfixed64Kind"
+	case Fixed64Kind:
+		return "Fixed64Kind"
+	case DoubleKind:
+		return "DoubleKind"
+	case StringKind:
+		return "StringKind"
+	case BytesKind:
+		return "BytesKind"
+	case MessageKind:
+		return "MessageKind"
+	case GroupKind:
+		return "GroupKind"
+	default:
+		return fmt.Sprintf("Kind(%d)", k)
+	}
+}
+
+// FieldNumber is the field number in a message.
+type FieldNumber = protowire.Number
+
+// FieldNumbers represent a list of field numbers.
+type FieldNumbers interface {
+	// Len reports the number of fields in the list.
+	Len() int
+	// Get returns the ith field number. It panics if out of bounds.
+	Get(i int) FieldNumber
+	// Has reports whether n is within the list of fields.
+	Has(n FieldNumber) bool
+
+	doNotImplement
+}
+
+// FieldRanges represent a list of field number ranges.
+type FieldRanges interface {
+	// Len reports the number of ranges in the list.
+	Len() int
+	// Get returns the ith range. It panics if out of bounds.
+	Get(i int) [2]FieldNumber // start inclusive; end exclusive
+	// Has reports whether n is within any of the ranges.
+	Has(n FieldNumber) bool
+
+	doNotImplement
+}
+
+// EnumNumber is the numeric value for an enum.
+type EnumNumber int32
+
+// EnumRanges represent a list of enum number ranges.
+type EnumRanges interface {
+	// Len reports the number of ranges in the list.
+	Len() int
+	// Get returns the ith range. It panics if out of bounds.
+	Get(i int) [2]EnumNumber // start inclusive; end inclusive
+	// Has reports whether n is within any of the ranges.
+	Has(n EnumNumber) bool
+
+	doNotImplement
+}
+
+var (
+	regexName     = regexp.MustCompile(`^[_a-zA-Z][_a-zA-Z0-9]*$`)
+	regexFullName = regexp.MustCompile(`^[_a-zA-Z][_a-zA-Z0-9]*(\.[_a-zA-Z][_a-zA-Z0-9]*)*$`)
+)
+
+// Name is the short name for a proto declaration. This is not the name
+// as used in Go source code, which might not be identical to the proto name.
+type Name string // e.g., "Kind"
+
+// IsValid reports whether n is a syntactically valid name.
+// An empty name is invalid.
+func (n Name) IsValid() bool {
+	return regexName.MatchString(string(n))
+}
+
+// Names represent a list of names.
+type Names interface {
+	// Len reports the number of names in the list.
+	Len() int
+	// Get returns the ith name. It panics if out of bounds.
+	Get(i int) Name
+	// Has reports whether s matches any names in the list.
+	Has(s Name) bool
+
+	doNotImplement
+}
+
+// FullName is a qualified name that uniquely identifies a proto declaration.
+// A qualified name is the concatenation of the proto package along with the
+// fully-declared name (i.e., name of parent preceding the name of the child),
+// with a '.' delimiter placed between each Name.
+//
+// This should not have any leading or trailing dots.
+type FullName string // e.g., "google.protobuf.Field.Kind"
+
+// IsValid reports whether n is a syntactically valid full name.
+// An empty full name is invalid.
+func (n FullName) IsValid() bool {
+	return regexFullName.MatchString(string(n))
+}
+
+// Name returns the short name, which is the last identifier segment.
+// A single segment FullName is the Name itself.
+func (n FullName) Name() Name {
+	if i := strings.LastIndexByte(string(n), '.'); i >= 0 {
+		return Name(n[i+1:])
+	}
+	return Name(n)
+}
+
+// Parent returns the full name with the trailing identifier removed.
+// A single segment FullName has no parent.
+func (n FullName) Parent() FullName {
+	if i := strings.LastIndexByte(string(n), '.'); i >= 0 {
+		return n[:i]
+	}
+	return ""
+}
+
+// Append returns the qualified name appended with the provided short name.
+//
+// Invariant: n == n.Parent().Append(n.Name()) // assuming n is valid
+func (n FullName) Append(s Name) FullName {
+	if n == "" {
+		return FullName(s)
+	}
+	return n + "." + FullName(s)
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/source.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/source.go
new file mode 100644
index 0000000..32ea3d9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/source.go
@@ -0,0 +1,52 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoreflect
+
+// SourceLocations is a list of source locations.
+type SourceLocations interface {
+	// Len reports the number of source locations in the proto file.
+	Len() int
+	// Get returns the ith SourceLocation. It panics if out of bounds.
+	Get(int) SourceLocation
+
+	doNotImplement
+
+	// TODO: Add ByPath and ByDescriptor helper methods.
+}
+
+// SourceLocation describes a source location and
+// corresponds with the google.protobuf.SourceCodeInfo.Location message.
+type SourceLocation struct {
+	// Path is the path to the declaration from the root file descriptor.
+	// The contents of this slice must not be mutated.
+	Path SourcePath
+
+	// StartLine and StartColumn are the zero-indexed starting location
+	// in the source file for the declaration.
+	StartLine, StartColumn int
+	// EndLine and EndColumn are the zero-indexed ending location
+	// in the source file for the declaration.
+	// In the descriptor.proto, the end line may be omitted if it is identical
+	// to the start line. Here, it is always populated.
+	EndLine, EndColumn int
+
+	// LeadingDetachedComments are the leading detached comments
+	// for the declaration. The contents of this slice must not be mutated.
+	LeadingDetachedComments []string
+	// LeadingComments is the leading attached comment for the declaration.
+	LeadingComments string
+	// TrailingComments is the trailing attached comment for the declaration.
+	TrailingComments string
+}
+
+// SourcePath identifies part of a file descriptor for a source location.
+// The SourcePath is a sequence of either field numbers or indexes into
+// a repeated field that form a path starting from the root file descriptor.
+//
+// See google.protobuf.SourceCodeInfo.Location.path.
+type SourcePath []int32
+
+// TODO: Add SourcePath.String method to pretty-print the path. For example:
+//	".message_type[6].nested_type[15].field[3]"
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/type.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/type.go
new file mode 100644
index 0000000..5be14a7
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/type.go
@@ -0,0 +1,631 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoreflect
+
+// Descriptor provides a set of accessors that are common to every descriptor.
+// Each descriptor type wraps the equivalent google.protobuf.XXXDescriptorProto,
+// but provides efficient lookup and immutability.
+//
+// Each descriptor is comparable. Equality implies that the two types are
+// exactly identical. However, it is possible for the same semantically
+// identical proto type to be represented by multiple type descriptors.
+//
+// For example, suppose we have t1 and t2 which are both MessageDescriptors.
+// If t1 == t2, then the types are definitely equal and all accessors return
+// the same information. However, if t1 != t2, then it is still possible that
+// they still represent the same proto type (e.g., t1.FullName == t2.FullName).
+// This can occur if a descriptor type is created dynamically, or multiple
+// versions of the same proto type are accidentally linked into the Go binary.
+type Descriptor interface {
+	// ParentFile returns the parent file descriptor that this descriptor
+	// is declared within. The parent file for the file descriptor is itself.
+	//
+	// Support for this functionality is optional and may return nil.
+	ParentFile() FileDescriptor
+
+	// Parent returns the parent containing this descriptor declaration.
+	// The following shows the mapping from child type to possible parent types:
+	//
+	//	╔═════════════════════╤═══════════════════════════════════╗
+	//	║ Child type          │ Possible parent types             ║
+	//	╠═════════════════════╪═══════════════════════════════════╣
+	//	║ FileDescriptor      │ nil                               ║
+	//	║ MessageDescriptor   │ FileDescriptor, MessageDescriptor ║
+	//	║ FieldDescriptor     │ FileDescriptor, MessageDescriptor ║
+	//	║ OneofDescriptor     │ MessageDescriptor                 ║
+	//	║ EnumDescriptor      │ FileDescriptor, MessageDescriptor ║
+	//	║ EnumValueDescriptor │ EnumDescriptor                    ║
+	//	║ ServiceDescriptor   │ FileDescriptor                    ║
+	//	║ MethodDescriptor    │ ServiceDescriptor                 ║
+	//	╚═════════════════════╧═══════════════════════════════════╝
+	//
+	// Support for this functionality is optional and may return nil.
+	Parent() Descriptor
+
+	// Index returns the index of this descriptor within its parent.
+	// It returns 0 if the descriptor does not have a parent or if the parent
+	// is unknown.
+	Index() int
+
+	// Syntax is the protobuf syntax.
+	Syntax() Syntax // e.g., Proto2 or Proto3
+
+	// Name is the short name of the declaration (i.e., FullName.Name).
+	Name() Name // e.g., "Any"
+
+	// FullName is the fully-qualified name of the declaration.
+	//
+	// The FullName is a concatenation of the full name of the type that this
+	// type is declared within and the declaration name. For example,
+	// field "foo_field" in message "proto.package.MyMessage" is
+	// uniquely identified as "proto.package.MyMessage.foo_field".
+	// Enum values are an exception to the rule (see EnumValueDescriptor).
+	FullName() FullName // e.g., "google.protobuf.Any"
+
+	// IsPlaceholder reports whether type information is missing since a
+	// dependency is not resolved, in which case only name information is known.
+	//
+	// Placeholder types may only be returned by the following accessors
+	// as a result of unresolved dependencies or weak imports:
+	//
+	//	╔═══════════════════════════════════╤═════════════════════╗
+	//	║ Accessor                          │ Descriptor          ║
+	//	╠═══════════════════════════════════╪═════════════════════╣
+	//	║ FileImports.FileDescriptor        │ FileDescriptor      ║
+	//	║ FieldDescriptor.Enum              │ EnumDescriptor      ║
+	//	║ FieldDescriptor.Message           │ MessageDescriptor   ║
+	//	║ FieldDescriptor.DefaultEnumValue  │ EnumValueDescriptor ║
+	//	║ FieldDescriptor.ContainingMessage │ MessageDescriptor   ║
+	//	║ MethodDescriptor.Input            │ MessageDescriptor   ║
+	//	║ MethodDescriptor.Output           │ MessageDescriptor   ║
+	//	╚═══════════════════════════════════╧═════════════════════╝
+	//
+	// If true, only Name and FullName are valid.
+	// For FileDescriptor, the Path is also valid.
+	IsPlaceholder() bool
+
+	// Options returns the descriptor options. The caller must not modify
+	// the returned value.
+	//
+	// To avoid a dependency cycle, this function returns a proto.Message value.
+	// The proto message type returned for each descriptor type is as follows:
+	//	╔═════════════════════╤══════════════════════════════════════════╗
+	//	║ Go type             │ Protobuf message type                    ║
+	//	╠═════════════════════╪══════════════════════════════════════════╣
+	//	║ FileDescriptor      │ google.protobuf.FileOptions              ║
+	//	║ EnumDescriptor      │ google.protobuf.EnumOptions              ║
+	//	║ EnumValueDescriptor │ google.protobuf.EnumValueOptions         ║
+	//	║ MessageDescriptor   │ google.protobuf.MessageOptions           ║
+	//	║ FieldDescriptor     │ google.protobuf.FieldOptions             ║
+	//	║ OneofDescriptor     │ google.protobuf.OneofOptions             ║
+	//	║ ServiceDescriptor   │ google.protobuf.ServiceOptions           ║
+	//	║ MethodDescriptor    │ google.protobuf.MethodOptions            ║
+	//	╚═════════════════════╧══════════════════════════════════════════╝
+	//
+	// This method returns a typed nil-pointer if no options are present.
+	// The caller must import the descriptorpb package to use this.
+	Options() ProtoMessage
+
+	doNotImplement
+}
+
+// FileDescriptor describes the types in a complete proto file and
+// corresponds with the google.protobuf.FileDescriptorProto message.
+//
+// Top-level declarations:
+// EnumDescriptor, MessageDescriptor, FieldDescriptor, and/or ServiceDescriptor.
+type FileDescriptor interface {
+	Descriptor // Descriptor.FullName is identical to Package
+
+	// Path returns the file name, relative to the source tree root.
+	Path() string // e.g., "path/to/file.proto"
+	// Package returns the protobuf package namespace.
+	Package() FullName // e.g., "google.protobuf"
+
+	// Imports is a list of imported proto files.
+	Imports() FileImports
+
+	// Enums is a list of the top-level enum declarations.
+	Enums() EnumDescriptors
+	// Messages is a list of the top-level message declarations.
+	Messages() MessageDescriptors
+	// Extensions is a list of the top-level extension declarations.
+	Extensions() ExtensionDescriptors
+	// Services is a list of the top-level service declarations.
+	Services() ServiceDescriptors
+
+	// SourceLocations is a list of source locations.
+	SourceLocations() SourceLocations
+
+	isFileDescriptor
+}
+type isFileDescriptor interface{ ProtoType(FileDescriptor) }
+
+// FileImports is a list of file imports.
+type FileImports interface {
+	// Len reports the number of files imported by this proto file.
+	Len() int
+	// Get returns the ith FileImport. It panics if out of bounds.
+	Get(i int) FileImport
+
+	doNotImplement
+}
+
+// FileImport is the declaration for a proto file import.
+type FileImport struct {
+	// FileDescriptor is the file type for the given import.
+	// It is a placeholder descriptor if IsWeak is set or if a dependency has
+	// not been regenerated to implement the new reflection APIs.
+	FileDescriptor
+
+	// IsPublic reports whether this is a public import, which causes this file
+	// to alias declarations within the imported file. The intended use cases
+	// for this feature is the ability to move proto files without breaking
+	// existing dependencies.
+	//
+	// The current file and the imported file must be within proto package.
+	IsPublic bool
+
+	// IsWeak reports whether this is a weak import, which does not impose
+	// a direct dependency on the target file.
+	//
+	// Weak imports are a legacy proto1 feature. Equivalent behavior is
+	// achieved using proto2 extension fields or proto3 Any messages.
+	IsWeak bool
+}
+
+// MessageDescriptor describes a message and
+// corresponds with the google.protobuf.DescriptorProto message.
+//
+// Nested declarations:
+// FieldDescriptor, OneofDescriptor, FieldDescriptor, EnumDescriptor,
+// and/or MessageDescriptor.
+type MessageDescriptor interface {
+	Descriptor
+
+	// IsMapEntry indicates that this is an auto-generated message type to
+	// represent the entry type for a map field.
+	//
+	// Map entry messages have only two fields:
+	//	• a "key" field with a field number of 1
+	//	• a "value" field with a field number of 2
+	// The key and value types are determined by these two fields.
+	//
+	// If IsMapEntry is true, it implies that FieldDescriptor.IsMap is true
+	// for some field with this message type.
+	IsMapEntry() bool
+
+	// Fields is a list of nested field declarations.
+	Fields() FieldDescriptors
+	// Oneofs is a list of nested oneof declarations.
+	Oneofs() OneofDescriptors
+
+	// ReservedNames is a list of reserved field names.
+	ReservedNames() Names
+	// ReservedRanges is a list of reserved ranges of field numbers.
+	ReservedRanges() FieldRanges
+	// RequiredNumbers is a list of required field numbers.
+	// In Proto3, it is always an empty list.
+	RequiredNumbers() FieldNumbers
+	// ExtensionRanges is the field ranges used for extension fields.
+	// In Proto3, it is always an empty ranges.
+	ExtensionRanges() FieldRanges
+	// ExtensionRangeOptions returns the ith extension range options.
+	//
+	// To avoid a dependency cycle, this method returns a proto.Message value,
+	// which always contains a google.protobuf.ExtensionRangeOptions message.
+	// This method returns a typed nil-pointer if no options are present.
+	// The caller must import the descriptorpb package to use this.
+	ExtensionRangeOptions(i int) ProtoMessage
+
+	// Enums is a list of nested enum declarations.
+	Enums() EnumDescriptors
+	// Messages is a list of nested message declarations.
+	Messages() MessageDescriptors
+	// Extensions is a list of nested extension declarations.
+	Extensions() ExtensionDescriptors
+
+	isMessageDescriptor
+}
+type isMessageDescriptor interface{ ProtoType(MessageDescriptor) }
+
+// MessageType encapsulates a MessageDescriptor with a concrete Go implementation.
+type MessageType interface {
+	// New returns a newly allocated empty message.
+	New() Message
+
+	// Zero returns an empty, read-only message.
+	Zero() Message
+
+	// Descriptor returns the message descriptor.
+	//
+	// Invariant: t.Descriptor() == t.New().Descriptor()
+	Descriptor() MessageDescriptor
+}
+
+// MessageDescriptors is a list of message declarations.
+type MessageDescriptors interface {
+	// Len reports the number of messages.
+	Len() int
+	// Get returns the ith MessageDescriptor. It panics if out of bounds.
+	Get(i int) MessageDescriptor
+	// ByName returns the MessageDescriptor for a message named s.
+	// It returns nil if not found.
+	ByName(s Name) MessageDescriptor
+
+	doNotImplement
+}
+
+// FieldDescriptor describes a field within a message and
+// corresponds with the google.protobuf.FieldDescriptorProto message.
+//
+// It is used for both normal fields defined within the parent message
+// (e.g., MessageDescriptor.Fields) and fields that extend some remote message
+// (e.g., FileDescriptor.Extensions or MessageDescriptor.Extensions).
+type FieldDescriptor interface {
+	Descriptor
+
+	// Number reports the unique number for this field.
+	Number() FieldNumber
+	// Cardinality reports the cardinality for this field.
+	Cardinality() Cardinality
+	// Kind reports the basic kind for this field.
+	Kind() Kind
+
+	// HasJSONName reports whether this field has an explicitly set JSON name.
+	HasJSONName() bool
+
+	// JSONName reports the name used for JSON serialization.
+	// It is usually the camel-cased form of the field name.
+	JSONName() string
+
+	// HasPresence reports whether the field distinguishes between unpopulated
+	// and default values.
+	HasPresence() bool
+
+	// IsExtension reports whether this is an extension field. If false,
+	// then Parent and ContainingMessage refer to the same message.
+	// Otherwise, ContainingMessage and Parent likely differ.
+	IsExtension() bool
+
+	// HasOptionalKeyword reports whether the "optional" keyword was explicitly
+	// specified in the source .proto file.
+	HasOptionalKeyword() bool
+
+	// IsWeak reports whether this is a weak field, which does not impose a
+	// direct dependency on the target type.
+	// If true, then Message returns a placeholder type.
+	IsWeak() bool
+
+	// IsPacked reports whether repeated primitive numeric kinds should be
+	// serialized using a packed encoding.
+	// If true, then it implies Cardinality is Repeated.
+	IsPacked() bool
+
+	// IsList reports whether this field represents a list,
+	// where the value type for the associated field is a List.
+	// It is equivalent to checking whether Cardinality is Repeated and
+	// that IsMap reports false.
+	IsList() bool
+
+	// IsMap reports whether this field represents a map,
+	// where the value type for the associated field is a Map.
+	// It is equivalent to checking whether Cardinality is Repeated,
+	// that the Kind is MessageKind, and that Message.IsMapEntry reports true.
+	IsMap() bool
+
+	// MapKey returns the field descriptor for the key in the map entry.
+	// It returns nil if IsMap reports false.
+	MapKey() FieldDescriptor
+
+	// MapValue returns the field descriptor for the value in the map entry.
+	// It returns nil if IsMap reports false.
+	MapValue() FieldDescriptor
+
+	// HasDefault reports whether this field has a default value.
+	HasDefault() bool
+
+	// Default returns the default value for scalar fields.
+	// For proto2, it is the default value as specified in the proto file,
+	// or the zero value if unspecified.
+	// For proto3, it is always the zero value of the scalar.
+	// The Value type is determined by the Kind.
+	Default() Value
+
+	// DefaultEnumValue returns the enum value descriptor for the default value
+	// of an enum field, and is nil for any other kind of field.
+	DefaultEnumValue() EnumValueDescriptor
+
+	// ContainingOneof is the containing oneof that this field belongs to,
+	// and is nil if this field is not part of a oneof.
+	ContainingOneof() OneofDescriptor
+
+	// ContainingMessage is the containing message that this field belongs to.
+	// For extension fields, this may not necessarily be the parent message
+	// that the field is declared within.
+	ContainingMessage() MessageDescriptor
+
+	// Enum is the enum descriptor if Kind is EnumKind.
+	// It returns nil for any other Kind.
+	Enum() EnumDescriptor
+
+	// Message is the message descriptor if Kind is
+	// MessageKind or GroupKind. It returns nil for any other Kind.
+	Message() MessageDescriptor
+
+	isFieldDescriptor
+}
+type isFieldDescriptor interface{ ProtoType(FieldDescriptor) }
+
+// FieldDescriptors is a list of field declarations.
+type FieldDescriptors interface {
+	// Len reports the number of fields.
+	Len() int
+	// Get returns the ith FieldDescriptor. It panics if out of bounds.
+	Get(i int) FieldDescriptor
+	// ByName returns the FieldDescriptor for a field named s.
+	// It returns nil if not found.
+	ByName(s Name) FieldDescriptor
+	// ByJSONName returns the FieldDescriptor for a field with s as the JSON name.
+	// It returns nil if not found.
+	ByJSONName(s string) FieldDescriptor
+	// ByNumber returns the FieldDescriptor for a field numbered n.
+	// It returns nil if not found.
+	ByNumber(n FieldNumber) FieldDescriptor
+
+	doNotImplement
+}
+
+// OneofDescriptor describes a oneof field set within a given message and
+// corresponds with the google.protobuf.OneofDescriptorProto message.
+type OneofDescriptor interface {
+	Descriptor
+
+	// IsSynthetic reports whether this is a synthetic oneof created to support
+	// proto3 optional semantics. If true, Fields contains exactly one field
+	// with HasOptionalKeyword specified.
+	IsSynthetic() bool
+
+	// Fields is a list of fields belonging to this oneof.
+	Fields() FieldDescriptors
+
+	isOneofDescriptor
+}
+type isOneofDescriptor interface{ ProtoType(OneofDescriptor) }
+
+// OneofDescriptors is a list of oneof declarations.
+type OneofDescriptors interface {
+	// Len reports the number of oneof fields.
+	Len() int
+	// Get returns the ith OneofDescriptor. It panics if out of bounds.
+	Get(i int) OneofDescriptor
+	// ByName returns the OneofDescriptor for a oneof named s.
+	// It returns nil if not found.
+	ByName(s Name) OneofDescriptor
+
+	doNotImplement
+}
+
+// ExtensionDescriptor is an alias of FieldDescriptor for documentation.
+type ExtensionDescriptor = FieldDescriptor
+
+// ExtensionTypeDescriptor is an ExtensionDescriptor with an associated ExtensionType.
+type ExtensionTypeDescriptor interface {
+	ExtensionDescriptor
+
+	// Type returns the associated ExtensionType.
+	Type() ExtensionType
+
+	// Descriptor returns the plain ExtensionDescriptor without the
+	// associated ExtensionType.
+	Descriptor() ExtensionDescriptor
+}
+
+// ExtensionDescriptors is a list of field declarations.
+type ExtensionDescriptors interface {
+	// Len reports the number of fields.
+	Len() int
+	// Get returns the ith ExtensionDescriptor. It panics if out of bounds.
+	Get(i int) ExtensionDescriptor
+	// ByName returns the ExtensionDescriptor for a field named s.
+	// It returns nil if not found.
+	ByName(s Name) ExtensionDescriptor
+
+	doNotImplement
+}
+
+// ExtensionType encapsulates an ExtensionDescriptor with a concrete
+// Go implementation. The nested field descriptor must be for a extension field.
+//
+// While a normal field is a member of the parent message that it is declared
+// within (see Descriptor.Parent), an extension field is a member of some other
+// target message (see ExtensionDescriptor.Extendee) and may have no
+// relationship with the parent. However, the full name of an extension field is
+// relative to the parent that it is declared within.
+//
+// For example:
+//	syntax = "proto2";
+//	package example;
+//	message FooMessage {
+//		extensions 100 to max;
+//	}
+//	message BarMessage {
+//		extends FooMessage { optional BarMessage bar_field = 100; }
+//	}
+//
+// Field "bar_field" is an extension of FooMessage, but its full name is
+// "example.BarMessage.bar_field" instead of "example.FooMessage.bar_field".
+type ExtensionType interface {
+	// New returns a new value for the field.
+	// For scalars, this returns the default value in native Go form.
+	New() Value
+
+	// Zero returns a new value for the field.
+	// For scalars, this returns the default value in native Go form.
+	// For composite types, this returns an empty, read-only message, list, or map.
+	Zero() Value
+
+	// TypeDescriptor returns the extension type descriptor.
+	TypeDescriptor() ExtensionTypeDescriptor
+
+	// ValueOf wraps the input and returns it as a Value.
+	// ValueOf panics if the input value is invalid or not the appropriate type.
+	//
+	// ValueOf is more extensive than protoreflect.ValueOf for a given field's
+	// value as it has more type information available.
+	ValueOf(interface{}) Value
+
+	// InterfaceOf completely unwraps the Value to the underlying Go type.
+	// InterfaceOf panics if the input is nil or does not represent the
+	// appropriate underlying Go type. For composite types, it panics if the
+	// value is not mutable.
+	//
+	// InterfaceOf is able to unwrap the Value further than Value.Interface
+	// as it has more type information available.
+	InterfaceOf(Value) interface{}
+
+	// IsValidValue reports whether the Value is valid to assign to the field.
+	IsValidValue(Value) bool
+
+	// IsValidInterface reports whether the input is valid to assign to the field.
+	IsValidInterface(interface{}) bool
+}
+
+// EnumDescriptor describes an enum and
+// corresponds with the google.protobuf.EnumDescriptorProto message.
+//
+// Nested declarations:
+// EnumValueDescriptor.
+type EnumDescriptor interface {
+	Descriptor
+
+	// Values is a list of nested enum value declarations.
+	Values() EnumValueDescriptors
+
+	// ReservedNames is a list of reserved enum names.
+	ReservedNames() Names
+	// ReservedRanges is a list of reserved ranges of enum numbers.
+	ReservedRanges() EnumRanges
+
+	isEnumDescriptor
+}
+type isEnumDescriptor interface{ ProtoType(EnumDescriptor) }
+
+// EnumType encapsulates an EnumDescriptor with a concrete Go implementation.
+type EnumType interface {
+	// New returns an instance of this enum type with its value set to n.
+	New(n EnumNumber) Enum
+
+	// Descriptor returns the enum descriptor.
+	//
+	// Invariant: t.Descriptor() == t.New(0).Descriptor()
+	Descriptor() EnumDescriptor
+}
+
+// EnumDescriptors is a list of enum declarations.
+type EnumDescriptors interface {
+	// Len reports the number of enum types.
+	Len() int
+	// Get returns the ith EnumDescriptor. It panics if out of bounds.
+	Get(i int) EnumDescriptor
+	// ByName returns the EnumDescriptor for an enum named s.
+	// It returns nil if not found.
+	ByName(s Name) EnumDescriptor
+
+	doNotImplement
+}
+
+// EnumValueDescriptor describes an enum value and
+// corresponds with the google.protobuf.EnumValueDescriptorProto message.
+//
+// All other proto declarations are in the namespace of the parent.
+// However, enum values do not follow this rule and are within the namespace
+// of the parent's parent (i.e., they are a sibling of the containing enum).
+// Thus, a value named "FOO_VALUE" declared within an enum uniquely identified
+// as "proto.package.MyEnum" has a full name of "proto.package.FOO_VALUE".
+type EnumValueDescriptor interface {
+	Descriptor
+
+	// Number returns the enum value as an integer.
+	Number() EnumNumber
+
+	isEnumValueDescriptor
+}
+type isEnumValueDescriptor interface{ ProtoType(EnumValueDescriptor) }
+
+// EnumValueDescriptors is a list of enum value declarations.
+type EnumValueDescriptors interface {
+	// Len reports the number of enum values.
+	Len() int
+	// Get returns the ith EnumValueDescriptor. It panics if out of bounds.
+	Get(i int) EnumValueDescriptor
+	// ByName returns the EnumValueDescriptor for the enum value named s.
+	// It returns nil if not found.
+	ByName(s Name) EnumValueDescriptor
+	// ByNumber returns the EnumValueDescriptor for the enum value numbered n.
+	// If multiple have the same number, the first one defined is returned
+	// It returns nil if not found.
+	ByNumber(n EnumNumber) EnumValueDescriptor
+
+	doNotImplement
+}
+
+// ServiceDescriptor describes a service and
+// corresponds with the google.protobuf.ServiceDescriptorProto message.
+//
+// Nested declarations: MethodDescriptor.
+type ServiceDescriptor interface {
+	Descriptor
+
+	// Methods is a list of nested message declarations.
+	Methods() MethodDescriptors
+
+	isServiceDescriptor
+}
+type isServiceDescriptor interface{ ProtoType(ServiceDescriptor) }
+
+// ServiceDescriptors is a list of service declarations.
+type ServiceDescriptors interface {
+	// Len reports the number of services.
+	Len() int
+	// Get returns the ith ServiceDescriptor. It panics if out of bounds.
+	Get(i int) ServiceDescriptor
+	// ByName returns the ServiceDescriptor for a service named s.
+	// It returns nil if not found.
+	ByName(s Name) ServiceDescriptor
+
+	doNotImplement
+}
+
+// MethodDescriptor describes a method and
+// corresponds with the google.protobuf.MethodDescriptorProto message.
+type MethodDescriptor interface {
+	Descriptor
+
+	// Input is the input message descriptor.
+	Input() MessageDescriptor
+	// Output is the output message descriptor.
+	Output() MessageDescriptor
+	// IsStreamingClient reports whether the client streams multiple messages.
+	IsStreamingClient() bool
+	// IsStreamingServer reports whether the server streams multiple messages.
+	IsStreamingServer() bool
+
+	isMethodDescriptor
+}
+type isMethodDescriptor interface{ ProtoType(MethodDescriptor) }
+
+// MethodDescriptors is a list of method declarations.
+type MethodDescriptors interface {
+	// Len reports the number of methods.
+	Len() int
+	// Get returns the ith MethodDescriptor. It panics if out of bounds.
+	Get(i int) MethodDescriptor
+	// ByName returns the MethodDescriptor for a service method named s.
+	// It returns nil if not found.
+	ByName(s Name) MethodDescriptor
+
+	doNotImplement
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/value.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/value.go
new file mode 100644
index 0000000..f319810
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/value.go
@@ -0,0 +1,285 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoreflect
+
+import "google.golang.org/protobuf/encoding/protowire"
+
+// Enum is a reflection interface for a concrete enum value,
+// which provides type information and a getter for the enum number.
+// Enum does not provide a mutable API since enums are commonly backed by
+// Go constants, which are not addressable.
+type Enum interface {
+	// Descriptor returns enum descriptor, which contains only the protobuf
+	// type information for the enum.
+	Descriptor() EnumDescriptor
+
+	// Type returns the enum type, which encapsulates both Go and protobuf
+	// type information. If the Go type information is not needed,
+	// it is recommended that the enum descriptor be used instead.
+	Type() EnumType
+
+	// Number returns the enum value as an integer.
+	Number() EnumNumber
+}
+
+// Message is a reflective interface for a concrete message value,
+// encapsulating both type and value information for the message.
+//
+// Accessor/mutators for individual fields are keyed by FieldDescriptor.
+// For non-extension fields, the descriptor must exactly match the
+// field known by the parent message.
+// For extension fields, the descriptor must implement ExtensionTypeDescriptor,
+// extend the parent message (i.e., have the same message FullName), and
+// be within the parent's extension range.
+//
+// Each field Value can be a scalar or a composite type (Message, List, or Map).
+// See Value for the Go types associated with a FieldDescriptor.
+// Providing a Value that is invalid or of an incorrect type panics.
+type Message interface {
+	// Descriptor returns message descriptor, which contains only the protobuf
+	// type information for the message.
+	Descriptor() MessageDescriptor
+
+	// Type returns the message type, which encapsulates both Go and protobuf
+	// type information. If the Go type information is not needed,
+	// it is recommended that the message descriptor be used instead.
+	Type() MessageType
+
+	// New returns a newly allocated and mutable empty message.
+	New() Message
+
+	// Interface unwraps the message reflection interface and
+	// returns the underlying ProtoMessage interface.
+	Interface() ProtoMessage
+
+	// Range iterates over every populated field in an undefined order,
+	// calling f for each field descriptor and value encountered.
+	// Range returns immediately if f returns false.
+	// While iterating, mutating operations may only be performed
+	// on the current field descriptor.
+	Range(f func(FieldDescriptor, Value) bool)
+
+	// Has reports whether a field is populated.
+	//
+	// Some fields have the property of nullability where it is possible to
+	// distinguish between the default value of a field and whether the field
+	// was explicitly populated with the default value. Singular message fields,
+	// member fields of a oneof, and proto2 scalar fields are nullable. Such
+	// fields are populated only if explicitly set.
+	//
+	// In other cases (aside from the nullable cases above),
+	// a proto3 scalar field is populated if it contains a non-zero value, and
+	// a repeated field is populated if it is non-empty.
+	Has(FieldDescriptor) bool
+
+	// Clear clears the field such that a subsequent Has call reports false.
+	//
+	// Clearing an extension field clears both the extension type and value
+	// associated with the given field number.
+	//
+	// Clear is a mutating operation and unsafe for concurrent use.
+	Clear(FieldDescriptor)
+
+	// Get retrieves the value for a field.
+	//
+	// For unpopulated scalars, it returns the default value, where
+	// the default value of a bytes scalar is guaranteed to be a copy.
+	// For unpopulated composite types, it returns an empty, read-only view
+	// of the value; to obtain a mutable reference, use Mutable.
+	Get(FieldDescriptor) Value
+
+	// Set stores the value for a field.
+	//
+	// For a field belonging to a oneof, it implicitly clears any other field
+	// that may be currently set within the same oneof.
+	// For extension fields, it implicitly stores the provided ExtensionType.
+	// When setting a composite type, it is unspecified whether the stored value
+	// aliases the source's memory in any way. If the composite value is an
+	// empty, read-only value, then it panics.
+	//
+	// Set is a mutating operation and unsafe for concurrent use.
+	Set(FieldDescriptor, Value)
+
+	// Mutable returns a mutable reference to a composite type.
+	//
+	// If the field is unpopulated, it may allocate a composite value.
+	// For a field belonging to a oneof, it implicitly clears any other field
+	// that may be currently set within the same oneof.
+	// For extension fields, it implicitly stores the provided ExtensionType
+	// if not already stored.
+	// It panics if the field does not contain a composite type.
+	//
+	// Mutable is a mutating operation and unsafe for concurrent use.
+	Mutable(FieldDescriptor) Value
+
+	// NewField returns a new value that is assignable to the field
+	// for the given descriptor. For scalars, this returns the default value.
+	// For lists, maps, and messages, this returns a new, empty, mutable value.
+	NewField(FieldDescriptor) Value
+
+	// WhichOneof reports which field within the oneof is populated,
+	// returning nil if none are populated.
+	// It panics if the oneof descriptor does not belong to this message.
+	WhichOneof(OneofDescriptor) FieldDescriptor
+
+	// GetUnknown retrieves the entire list of unknown fields.
+	// The caller may only mutate the contents of the RawFields
+	// if the mutated bytes are stored back into the message with SetUnknown.
+	GetUnknown() RawFields
+
+	// SetUnknown stores an entire list of unknown fields.
+	// The raw fields must be syntactically valid according to the wire format.
+	// An implementation may panic if this is not the case.
+	// Once stored, the caller must not mutate the content of the RawFields.
+	// An empty RawFields may be passed to clear the fields.
+	//
+	// SetUnknown is a mutating operation and unsafe for concurrent use.
+	SetUnknown(RawFields)
+
+	// IsValid reports whether the message is valid.
+	//
+	// An invalid message is an empty, read-only value.
+	//
+	// An invalid message often corresponds to a nil pointer of the concrete
+	// message type, but the details are implementation dependent.
+	// Validity is not part of the protobuf data model, and may not
+	// be preserved in marshaling or other operations.
+	IsValid() bool
+
+	// ProtoMethods returns optional fast-path implementions of various operations.
+	// This method may return nil.
+	//
+	// The returned methods type is identical to
+	// "google.golang.org/protobuf/runtime/protoiface".Methods.
+	// Consult the protoiface package documentation for details.
+	ProtoMethods() *methods
+}
+
+// RawFields is the raw bytes for an ordered sequence of fields.
+// Each field contains both the tag (representing field number and wire type),
+// and also the wire data itself.
+type RawFields []byte
+
+// IsValid reports whether b is syntactically correct wire format.
+func (b RawFields) IsValid() bool {
+	for len(b) > 0 {
+		_, _, n := protowire.ConsumeField(b)
+		if n < 0 {
+			return false
+		}
+		b = b[n:]
+	}
+	return true
+}
+
+// List is a zero-indexed, ordered list.
+// The element Value type is determined by FieldDescriptor.Kind.
+// Providing a Value that is invalid or of an incorrect type panics.
+type List interface {
+	// Len reports the number of entries in the List.
+	// Get, Set, and Truncate panic with out of bound indexes.
+	Len() int
+
+	// Get retrieves the value at the given index.
+	// It never returns an invalid value.
+	Get(int) Value
+
+	// Set stores a value for the given index.
+	// When setting a composite type, it is unspecified whether the set
+	// value aliases the source's memory in any way.
+	//
+	// Set is a mutating operation and unsafe for concurrent use.
+	Set(int, Value)
+
+	// Append appends the provided value to the end of the list.
+	// When appending a composite type, it is unspecified whether the appended
+	// value aliases the source's memory in any way.
+	//
+	// Append is a mutating operation and unsafe for concurrent use.
+	Append(Value)
+
+	// AppendMutable appends a new, empty, mutable message value to the end
+	// of the list and returns it.
+	// It panics if the list does not contain a message type.
+	AppendMutable() Value
+
+	// Truncate truncates the list to a smaller length.
+	//
+	// Truncate is a mutating operation and unsafe for concurrent use.
+	Truncate(int)
+
+	// NewElement returns a new value for a list element.
+	// For enums, this returns the first enum value.
+	// For other scalars, this returns the zero value.
+	// For messages, this returns a new, empty, mutable value.
+	NewElement() Value
+
+	// IsValid reports whether the list is valid.
+	//
+	// An invalid list is an empty, read-only value.
+	//
+	// Validity is not part of the protobuf data model, and may not
+	// be preserved in marshaling or other operations.
+	IsValid() bool
+}
+
+// Map is an unordered, associative map.
+// The entry MapKey type is determined by FieldDescriptor.MapKey.Kind.
+// The entry Value type is determined by FieldDescriptor.MapValue.Kind.
+// Providing a MapKey or Value that is invalid or of an incorrect type panics.
+type Map interface {
+	// Len reports the number of elements in the map.
+	Len() int
+
+	// Range iterates over every map entry in an undefined order,
+	// calling f for each key and value encountered.
+	// Range calls f Len times unless f returns false, which stops iteration.
+	// While iterating, mutating operations may only be performed
+	// on the current map key.
+	Range(f func(MapKey, Value) bool)
+
+	// Has reports whether an entry with the given key is in the map.
+	Has(MapKey) bool
+
+	// Clear clears the entry associated with they given key.
+	// The operation does nothing if there is no entry associated with the key.
+	//
+	// Clear is a mutating operation and unsafe for concurrent use.
+	Clear(MapKey)
+
+	// Get retrieves the value for an entry with the given key.
+	// It returns an invalid value for non-existent entries.
+	Get(MapKey) Value
+
+	// Set stores the value for an entry with the given key.
+	// It panics when given a key or value that is invalid or the wrong type.
+	// When setting a composite type, it is unspecified whether the set
+	// value aliases the source's memory in any way.
+	//
+	// Set is a mutating operation and unsafe for concurrent use.
+	Set(MapKey, Value)
+
+	// Mutable retrieves a mutable reference to the entry for the given key.
+	// If no entry exists for the key, it creates a new, empty, mutable value
+	// and stores it as the entry for the key.
+	// It panics if the map value is not a message.
+	Mutable(MapKey) Value
+
+	// NewValue returns a new value assignable as a map value.
+	// For enums, this returns the first enum value.
+	// For other scalars, this returns the zero value.
+	// For messages, this returns a new, empty, mutable value.
+	NewValue() Value
+
+	// IsValid reports whether the map is valid.
+	//
+	// An invalid map is an empty, read-only value.
+	//
+	// An invalid message often corresponds to a nil Go map value,
+	// but the details are implementation dependent.
+	// Validity is not part of the protobuf data model, and may not
+	// be preserved in marshaling or other operations.
+	IsValid() bool
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/value_pure.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_pure.go
new file mode 100644
index 0000000..918e685
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_pure.go
@@ -0,0 +1,59 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build purego appengine
+
+package protoreflect
+
+import "google.golang.org/protobuf/internal/pragma"
+
+type valueType int
+
+const (
+	nilType valueType = iota
+	boolType
+	int32Type
+	int64Type
+	uint32Type
+	uint64Type
+	float32Type
+	float64Type
+	stringType
+	bytesType
+	enumType
+	ifaceType
+)
+
+// value is a union where only one type can be represented at a time.
+// This uses a distinct field for each type. This is type safe in Go, but
+// occupies more memory than necessary (72B).
+type value struct {
+	pragma.DoNotCompare // 0B
+
+	typ   valueType   // 8B
+	num   uint64      // 8B
+	str   string      // 16B
+	bin   []byte      // 24B
+	iface interface{} // 16B
+}
+
+func valueOfString(v string) Value {
+	return Value{typ: stringType, str: v}
+}
+func valueOfBytes(v []byte) Value {
+	return Value{typ: bytesType, bin: v}
+}
+func valueOfIface(v interface{}) Value {
+	return Value{typ: ifaceType, iface: v}
+}
+
+func (v Value) getString() string {
+	return v.str
+}
+func (v Value) getBytes() []byte {
+	return v.bin
+}
+func (v Value) getIface() interface{} {
+	return v.iface
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/value_union.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_union.go
new file mode 100644
index 0000000..f334f71
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_union.go
@@ -0,0 +1,409 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoreflect
+
+import (
+	"fmt"
+	"math"
+)
+
+// Value is a union where only one Go type may be set at a time.
+// The Value is used to represent all possible values a field may take.
+// The following shows which Go type is used to represent each proto Kind:
+//
+//	╔════════════╤═════════════════════════════════════╗
+//	║ Go type    │ Protobuf kind                       ║
+//	╠════════════╪═════════════════════════════════════╣
+//	║ bool       │ BoolKind                            ║
+//	║ int32      │ Int32Kind, Sint32Kind, Sfixed32Kind ║
+//	║ int64      │ Int64Kind, Sint64Kind, Sfixed64Kind ║
+//	║ uint32     │ Uint32Kind, Fixed32Kind             ║
+//	║ uint64     │ Uint64Kind, Fixed64Kind             ║
+//	║ float32    │ FloatKind                           ║
+//	║ float64    │ DoubleKind                          ║
+//	║ string     │ StringKind                          ║
+//	║ []byte     │ BytesKind                           ║
+//	║ EnumNumber │ EnumKind                            ║
+//	║ Message    │ MessageKind, GroupKind              ║
+//	╚════════════╧═════════════════════════════════════╝
+//
+// Multiple protobuf Kinds may be represented by a single Go type if the type
+// can losslessly represent the information for the proto kind. For example,
+// Int64Kind, Sint64Kind, and Sfixed64Kind are all represented by int64,
+// but use different integer encoding methods.
+//
+// The List or Map types are used if the field cardinality is repeated.
+// A field is a List if FieldDescriptor.IsList reports true.
+// A field is a Map if FieldDescriptor.IsMap reports true.
+//
+// Converting to/from a Value and a concrete Go value panics on type mismatch.
+// For example, ValueOf("hello").Int() panics because this attempts to
+// retrieve an int64 from a string.
+type Value value
+
+// The protoreflect API uses a custom Value union type instead of interface{}
+// to keep the future open for performance optimizations. Using an interface{}
+// always incurs an allocation for primitives (e.g., int64) since it needs to
+// be boxed on the heap (as interfaces can only contain pointers natively).
+// Instead, we represent the Value union as a flat struct that internally keeps
+// track of which type is set. Using unsafe, the Value union can be reduced
+// down to 24B, which is identical in size to a slice.
+//
+// The latest compiler (Go1.11) currently suffers from some limitations:
+//	• With inlining, the compiler should be able to statically prove that
+//	only one of these switch cases are taken and inline one specific case.
+//	See https://golang.org/issue/22310.
+
+// ValueOf returns a Value initialized with the concrete value stored in v.
+// This panics if the type does not match one of the allowed types in the
+// Value union.
+func ValueOf(v interface{}) Value {
+	switch v := v.(type) {
+	case nil:
+		return Value{}
+	case bool:
+		return ValueOfBool(v)
+	case int32:
+		return ValueOfInt32(v)
+	case int64:
+		return ValueOfInt64(v)
+	case uint32:
+		return ValueOfUint32(v)
+	case uint64:
+		return ValueOfUint64(v)
+	case float32:
+		return ValueOfFloat32(v)
+	case float64:
+		return ValueOfFloat64(v)
+	case string:
+		return ValueOfString(v)
+	case []byte:
+		return ValueOfBytes(v)
+	case EnumNumber:
+		return ValueOfEnum(v)
+	case Message, List, Map:
+		return valueOfIface(v)
+	default:
+		panic(fmt.Sprintf("invalid type: %T", v))
+	}
+}
+
+// ValueOfBool returns a new boolean value.
+func ValueOfBool(v bool) Value {
+	if v {
+		return Value{typ: boolType, num: 1}
+	} else {
+		return Value{typ: boolType, num: 0}
+	}
+}
+
+// ValueOfInt32 returns a new int32 value.
+func ValueOfInt32(v int32) Value {
+	return Value{typ: int32Type, num: uint64(v)}
+}
+
+// ValueOfInt64 returns a new int64 value.
+func ValueOfInt64(v int64) Value {
+	return Value{typ: int64Type, num: uint64(v)}
+}
+
+// ValueOfUint32 returns a new uint32 value.
+func ValueOfUint32(v uint32) Value {
+	return Value{typ: uint32Type, num: uint64(v)}
+}
+
+// ValueOfUint64 returns a new uint64 value.
+func ValueOfUint64(v uint64) Value {
+	return Value{typ: uint64Type, num: v}
+}
+
+// ValueOfFloat32 returns a new float32 value.
+func ValueOfFloat32(v float32) Value {
+	return Value{typ: float32Type, num: uint64(math.Float64bits(float64(v)))}
+}
+
+// ValueOfFloat64 returns a new float64 value.
+func ValueOfFloat64(v float64) Value {
+	return Value{typ: float64Type, num: uint64(math.Float64bits(float64(v)))}
+}
+
+// ValueOfString returns a new string value.
+func ValueOfString(v string) Value {
+	return valueOfString(v)
+}
+
+// ValueOfBytes returns a new bytes value.
+func ValueOfBytes(v []byte) Value {
+	return valueOfBytes(v[:len(v):len(v)])
+}
+
+// ValueOfEnum returns a new enum value.
+func ValueOfEnum(v EnumNumber) Value {
+	return Value{typ: enumType, num: uint64(v)}
+}
+
+// ValueOfMessage returns a new Message value.
+func ValueOfMessage(v Message) Value {
+	return valueOfIface(v)
+}
+
+// ValueOfList returns a new List value.
+func ValueOfList(v List) Value {
+	return valueOfIface(v)
+}
+
+// ValueOfMap returns a new Map value.
+func ValueOfMap(v Map) Value {
+	return valueOfIface(v)
+}
+
+// IsValid reports whether v is populated with a value.
+func (v Value) IsValid() bool {
+	return v.typ != nilType
+}
+
+// Interface returns v as an interface{}.
+//
+// Invariant: v == ValueOf(v).Interface()
+func (v Value) Interface() interface{} {
+	switch v.typ {
+	case nilType:
+		return nil
+	case boolType:
+		return v.Bool()
+	case int32Type:
+		return int32(v.Int())
+	case int64Type:
+		return int64(v.Int())
+	case uint32Type:
+		return uint32(v.Uint())
+	case uint64Type:
+		return uint64(v.Uint())
+	case float32Type:
+		return float32(v.Float())
+	case float64Type:
+		return float64(v.Float())
+	case stringType:
+		return v.String()
+	case bytesType:
+		return v.Bytes()
+	case enumType:
+		return v.Enum()
+	default:
+		return v.getIface()
+	}
+}
+
+func (v Value) typeName() string {
+	switch v.typ {
+	case nilType:
+		return "nil"
+	case boolType:
+		return "bool"
+	case int32Type:
+		return "int32"
+	case int64Type:
+		return "int64"
+	case uint32Type:
+		return "uint32"
+	case uint64Type:
+		return "uint64"
+	case float32Type:
+		return "float32"
+	case float64Type:
+		return "float64"
+	case stringType:
+		return "string"
+	case bytesType:
+		return "bytes"
+	case enumType:
+		return "enum"
+	default:
+		switch v := v.getIface().(type) {
+		case Message:
+			return "message"
+		case List:
+			return "list"
+		case Map:
+			return "map"
+		default:
+			return fmt.Sprintf("<unknown: %T>", v)
+		}
+	}
+}
+
+func (v Value) panicMessage(what string) string {
+	return fmt.Sprintf("type mismatch: cannot convert %v to %s", v.typeName(), what)
+}
+
+// Bool returns v as a bool and panics if the type is not a bool.
+func (v Value) Bool() bool {
+	switch v.typ {
+	case boolType:
+		return v.num > 0
+	default:
+		panic(v.panicMessage("bool"))
+	}
+}
+
+// Int returns v as a int64 and panics if the type is not a int32 or int64.
+func (v Value) Int() int64 {
+	switch v.typ {
+	case int32Type, int64Type:
+		return int64(v.num)
+	default:
+		panic(v.panicMessage("int"))
+	}
+}
+
+// Uint returns v as a uint64 and panics if the type is not a uint32 or uint64.
+func (v Value) Uint() uint64 {
+	switch v.typ {
+	case uint32Type, uint64Type:
+		return uint64(v.num)
+	default:
+		panic(v.panicMessage("uint"))
+	}
+}
+
+// Float returns v as a float64 and panics if the type is not a float32 or float64.
+func (v Value) Float() float64 {
+	switch v.typ {
+	case float32Type, float64Type:
+		return math.Float64frombits(uint64(v.num))
+	default:
+		panic(v.panicMessage("float"))
+	}
+}
+
+// String returns v as a string. Since this method implements fmt.Stringer,
+// this returns the formatted string value for any non-string type.
+func (v Value) String() string {
+	switch v.typ {
+	case stringType:
+		return v.getString()
+	default:
+		return fmt.Sprint(v.Interface())
+	}
+}
+
+// Bytes returns v as a []byte and panics if the type is not a []byte.
+func (v Value) Bytes() []byte {
+	switch v.typ {
+	case bytesType:
+		return v.getBytes()
+	default:
+		panic(v.panicMessage("bytes"))
+	}
+}
+
+// Enum returns v as a EnumNumber and panics if the type is not a EnumNumber.
+func (v Value) Enum() EnumNumber {
+	switch v.typ {
+	case enumType:
+		return EnumNumber(v.num)
+	default:
+		panic(v.panicMessage("enum"))
+	}
+}
+
+// Message returns v as a Message and panics if the type is not a Message.
+func (v Value) Message() Message {
+	switch vi := v.getIface().(type) {
+	case Message:
+		return vi
+	default:
+		panic(v.panicMessage("message"))
+	}
+}
+
+// List returns v as a List and panics if the type is not a List.
+func (v Value) List() List {
+	switch vi := v.getIface().(type) {
+	case List:
+		return vi
+	default:
+		panic(v.panicMessage("list"))
+	}
+}
+
+// Map returns v as a Map and panics if the type is not a Map.
+func (v Value) Map() Map {
+	switch vi := v.getIface().(type) {
+	case Map:
+		return vi
+	default:
+		panic(v.panicMessage("map"))
+	}
+}
+
+// MapKey returns v as a MapKey and panics for invalid MapKey types.
+func (v Value) MapKey() MapKey {
+	switch v.typ {
+	case boolType, int32Type, int64Type, uint32Type, uint64Type, stringType:
+		return MapKey(v)
+	default:
+		panic(v.panicMessage("map key"))
+	}
+}
+
+// MapKey is used to index maps, where the Go type of the MapKey must match
+// the specified key Kind (see MessageDescriptor.IsMapEntry).
+// The following shows what Go type is used to represent each proto Kind:
+//
+//	╔═════════╤═════════════════════════════════════╗
+//	║ Go type │ Protobuf kind                       ║
+//	╠═════════╪═════════════════════════════════════╣
+//	║ bool    │ BoolKind                            ║
+//	║ int32   │ Int32Kind, Sint32Kind, Sfixed32Kind ║
+//	║ int64   │ Int64Kind, Sint64Kind, Sfixed64Kind ║
+//	║ uint32  │ Uint32Kind, Fixed32Kind             ║
+//	║ uint64  │ Uint64Kind, Fixed64Kind             ║
+//	║ string  │ StringKind                          ║
+//	╚═════════╧═════════════════════════════════════╝
+//
+// A MapKey is constructed and accessed through a Value:
+//	k := ValueOf("hash").MapKey() // convert string to MapKey
+//	s := k.String()               // convert MapKey to string
+//
+// The MapKey is a strict subset of valid types used in Value;
+// converting a Value to a MapKey with an invalid type panics.
+type MapKey value
+
+// IsValid reports whether k is populated with a value.
+func (k MapKey) IsValid() bool {
+	return Value(k).IsValid()
+}
+
+// Interface returns k as an interface{}.
+func (k MapKey) Interface() interface{} {
+	return Value(k).Interface()
+}
+
+// Bool returns k as a bool and panics if the type is not a bool.
+func (k MapKey) Bool() bool {
+	return Value(k).Bool()
+}
+
+// Int returns k as a int64 and panics if the type is not a int32 or int64.
+func (k MapKey) Int() int64 {
+	return Value(k).Int()
+}
+
+// Uint returns k as a uint64 and panics if the type is not a uint32 or uint64.
+func (k MapKey) Uint() uint64 {
+	return Value(k).Uint()
+}
+
+// String returns k as a string. Since this method implements fmt.Stringer,
+// this returns the formatted string value for any non-string type.
+func (k MapKey) String() string {
+	return Value(k).String()
+}
+
+// Value returns k as a Value.
+func (k MapKey) Value() Value {
+	return Value(k)
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoreflect/value_unsafe.go b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_unsafe.go
new file mode 100644
index 0000000..c45debd
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoreflect/value_unsafe.go
@@ -0,0 +1,98 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !purego,!appengine
+
+package protoreflect
+
+import (
+	"unsafe"
+
+	"google.golang.org/protobuf/internal/pragma"
+)
+
+type (
+	stringHeader struct {
+		Data unsafe.Pointer
+		Len  int
+	}
+	sliceHeader struct {
+		Data unsafe.Pointer
+		Len  int
+		Cap  int
+	}
+	ifaceHeader struct {
+		Type unsafe.Pointer
+		Data unsafe.Pointer
+	}
+)
+
+var (
+	nilType     = typeOf(nil)
+	boolType    = typeOf(*new(bool))
+	int32Type   = typeOf(*new(int32))
+	int64Type   = typeOf(*new(int64))
+	uint32Type  = typeOf(*new(uint32))
+	uint64Type  = typeOf(*new(uint64))
+	float32Type = typeOf(*new(float32))
+	float64Type = typeOf(*new(float64))
+	stringType  = typeOf(*new(string))
+	bytesType   = typeOf(*new([]byte))
+	enumType    = typeOf(*new(EnumNumber))
+)
+
+// typeOf returns a pointer to the Go type information.
+// The pointer is comparable and equal if and only if the types are identical.
+func typeOf(t interface{}) unsafe.Pointer {
+	return (*ifaceHeader)(unsafe.Pointer(&t)).Type
+}
+
+// value is a union where only one type can be represented at a time.
+// The struct is 24B large on 64-bit systems and requires the minimum storage
+// necessary to represent each possible type.
+//
+// The Go GC needs to be able to scan variables containing pointers.
+// As such, pointers and non-pointers cannot be intermixed.
+type value struct {
+	pragma.DoNotCompare // 0B
+
+	// typ stores the type of the value as a pointer to the Go type.
+	typ unsafe.Pointer // 8B
+
+	// ptr stores the data pointer for a String, Bytes, or interface value.
+	ptr unsafe.Pointer // 8B
+
+	// num stores a Bool, Int32, Int64, Uint32, Uint64, Float32, Float64, or
+	// Enum value as a raw uint64.
+	//
+	// It is also used to store the length of a String or Bytes value;
+	// the capacity is ignored.
+	num uint64 // 8B
+}
+
+func valueOfString(v string) Value {
+	p := (*stringHeader)(unsafe.Pointer(&v))
+	return Value{typ: stringType, ptr: p.Data, num: uint64(len(v))}
+}
+func valueOfBytes(v []byte) Value {
+	p := (*sliceHeader)(unsafe.Pointer(&v))
+	return Value{typ: bytesType, ptr: p.Data, num: uint64(len(v))}
+}
+func valueOfIface(v interface{}) Value {
+	p := (*ifaceHeader)(unsafe.Pointer(&v))
+	return Value{typ: p.Type, ptr: p.Data}
+}
+
+func (v Value) getString() (x string) {
+	*(*stringHeader)(unsafe.Pointer(&x)) = stringHeader{Data: v.ptr, Len: int(v.num)}
+	return x
+}
+func (v Value) getBytes() (x []byte) {
+	*(*sliceHeader)(unsafe.Pointer(&x)) = sliceHeader{Data: v.ptr, Len: int(v.num), Cap: int(v.num)}
+	return x
+}
+func (v Value) getIface() (x interface{}) {
+	*(*ifaceHeader)(unsafe.Pointer(&x)) = ifaceHeader{Type: v.typ, Data: v.ptr}
+	return x
+}
diff --git a/vendor/google.golang.org/protobuf/reflect/protoregistry/registry.go b/vendor/google.golang.org/protobuf/reflect/protoregistry/registry.go
new file mode 100644
index 0000000..43f16c6
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/reflect/protoregistry/registry.go
@@ -0,0 +1,768 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protoregistry provides data structures to register and lookup
+// protobuf descriptor types.
+//
+// The Files registry contains file descriptors and provides the ability
+// to iterate over the files or lookup a specific descriptor within the files.
+// Files only contains protobuf descriptors and has no understanding of Go
+// type information that may be associated with each descriptor.
+//
+// The Types registry contains descriptor types for which there is a known
+// Go type associated with that descriptor. It provides the ability to iterate
+// over the registered types or lookup a type by name.
+package protoregistry
+
+import (
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// ignoreConflict reports whether to ignore a registration conflict
+// given the descriptor being registered and the error.
+// It is a variable so that the behavior is easily overridden in another file.
+var ignoreConflict = func(d protoreflect.Descriptor, err error) bool {
+	log.Printf(""+
+		"WARNING: %v\n"+
+		"A future release will panic on registration conflicts. See:\n"+
+		"https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict\n"+
+		"\n", err)
+	return true
+}
+
+var globalMutex sync.RWMutex
+
+// GlobalFiles is a global registry of file descriptors.
+var GlobalFiles *Files = new(Files)
+
+// GlobalTypes is the registry used by default for type lookups
+// unless a local registry is provided by the user.
+var GlobalTypes *Types = new(Types)
+
+// NotFound is a sentinel error value to indicate that the type was not found.
+//
+// Since registry lookup can happen in the critical performance path, resolvers
+// must return this exact error value, not an error wrapping it.
+var NotFound = errors.New("not found")
+
+// Files is a registry for looking up or iterating over files and the
+// descriptors contained within them.
+// The Find and Range methods are safe for concurrent use.
+type Files struct {
+	// The map of descsByName contains:
+	//	EnumDescriptor
+	//	EnumValueDescriptor
+	//	MessageDescriptor
+	//	ExtensionDescriptor
+	//	ServiceDescriptor
+	//	*packageDescriptor
+	//
+	// Note that files are stored as a slice, since a package may contain
+	// multiple files. Only top-level declarations are registered.
+	// Note that enum values are in the top-level since that are in the same
+	// scope as the parent enum.
+	descsByName map[protoreflect.FullName]interface{}
+	filesByPath map[string]protoreflect.FileDescriptor
+}
+
+type packageDescriptor struct {
+	files []protoreflect.FileDescriptor
+}
+
+// RegisterFile registers the provided file descriptor.
+//
+// If any descriptor within the file conflicts with the descriptor of any
+// previously registered file (e.g., two enums with the same full name),
+// then the file is not registered and an error is returned.
+//
+// It is permitted for multiple files to have the same file path.
+func (r *Files) RegisterFile(file protoreflect.FileDescriptor) error {
+	if r == GlobalFiles {
+		globalMutex.Lock()
+		defer globalMutex.Unlock()
+	}
+	if r.descsByName == nil {
+		r.descsByName = map[protoreflect.FullName]interface{}{
+			"": &packageDescriptor{},
+		}
+		r.filesByPath = make(map[string]protoreflect.FileDescriptor)
+	}
+	path := file.Path()
+	if prev := r.filesByPath[path]; prev != nil {
+		err := errors.New("file %q is already registered", file.Path())
+		err = amendErrorWithCaller(err, prev, file)
+		if r == GlobalFiles && ignoreConflict(file, err) {
+			err = nil
+		}
+		return err
+	}
+
+	for name := file.Package(); name != ""; name = name.Parent() {
+		switch prev := r.descsByName[name]; prev.(type) {
+		case nil, *packageDescriptor:
+		default:
+			err := errors.New("file %q has a package name conflict over %v", file.Path(), name)
+			err = amendErrorWithCaller(err, prev, file)
+			if r == GlobalFiles && ignoreConflict(file, err) {
+				err = nil
+			}
+			return err
+		}
+	}
+	var err error
+	var hasConflict bool
+	rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) {
+		if prev := r.descsByName[d.FullName()]; prev != nil {
+			hasConflict = true
+			err = errors.New("file %q has a name conflict over %v", file.Path(), d.FullName())
+			err = amendErrorWithCaller(err, prev, file)
+			if r == GlobalFiles && ignoreConflict(d, err) {
+				err = nil
+			}
+		}
+	})
+	if hasConflict {
+		return err
+	}
+
+	for name := file.Package(); name != ""; name = name.Parent() {
+		if r.descsByName[name] == nil {
+			r.descsByName[name] = &packageDescriptor{}
+		}
+	}
+	p := r.descsByName[file.Package()].(*packageDescriptor)
+	p.files = append(p.files, file)
+	rangeTopLevelDescriptors(file, func(d protoreflect.Descriptor) {
+		r.descsByName[d.FullName()] = d
+	})
+	r.filesByPath[path] = file
+	return nil
+}
+
+// FindDescriptorByName looks up a descriptor by the full name.
+//
+// This returns (nil, NotFound) if not found.
+func (r *Files) FindDescriptorByName(name protoreflect.FullName) (protoreflect.Descriptor, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	prefix := name
+	suffix := nameSuffix("")
+	for prefix != "" {
+		if d, ok := r.descsByName[prefix]; ok {
+			switch d := d.(type) {
+			case protoreflect.EnumDescriptor:
+				if d.FullName() == name {
+					return d, nil
+				}
+			case protoreflect.EnumValueDescriptor:
+				if d.FullName() == name {
+					return d, nil
+				}
+			case protoreflect.MessageDescriptor:
+				if d.FullName() == name {
+					return d, nil
+				}
+				if d := findDescriptorInMessage(d, suffix); d != nil && d.FullName() == name {
+					return d, nil
+				}
+			case protoreflect.ExtensionDescriptor:
+				if d.FullName() == name {
+					return d, nil
+				}
+			case protoreflect.ServiceDescriptor:
+				if d.FullName() == name {
+					return d, nil
+				}
+				if d := d.Methods().ByName(suffix.Pop()); d != nil && d.FullName() == name {
+					return d, nil
+				}
+			}
+			return nil, NotFound
+		}
+		prefix = prefix.Parent()
+		suffix = nameSuffix(name[len(prefix)+len("."):])
+	}
+	return nil, NotFound
+}
+
+func findDescriptorInMessage(md protoreflect.MessageDescriptor, suffix nameSuffix) protoreflect.Descriptor {
+	name := suffix.Pop()
+	if suffix == "" {
+		if ed := md.Enums().ByName(name); ed != nil {
+			return ed
+		}
+		for i := md.Enums().Len() - 1; i >= 0; i-- {
+			if vd := md.Enums().Get(i).Values().ByName(name); vd != nil {
+				return vd
+			}
+		}
+		if xd := md.Extensions().ByName(name); xd != nil {
+			return xd
+		}
+		if fd := md.Fields().ByName(name); fd != nil {
+			return fd
+		}
+		if od := md.Oneofs().ByName(name); od != nil {
+			return od
+		}
+	}
+	if md := md.Messages().ByName(name); md != nil {
+		if suffix == "" {
+			return md
+		}
+		return findDescriptorInMessage(md, suffix)
+	}
+	return nil
+}
+
+type nameSuffix string
+
+func (s *nameSuffix) Pop() (name protoreflect.Name) {
+	if i := strings.IndexByte(string(*s), '.'); i >= 0 {
+		name, *s = protoreflect.Name((*s)[:i]), (*s)[i+1:]
+	} else {
+		name, *s = protoreflect.Name((*s)), ""
+	}
+	return name
+}
+
+// FindFileByPath looks up a file by the path.
+//
+// This returns (nil, NotFound) if not found.
+func (r *Files) FindFileByPath(path string) (protoreflect.FileDescriptor, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	if fd, ok := r.filesByPath[path]; ok {
+		return fd, nil
+	}
+	return nil, NotFound
+}
+
+// NumFiles reports the number of registered files.
+func (r *Files) NumFiles() int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	return len(r.filesByPath)
+}
+
+// RangeFiles iterates over all registered files while f returns true.
+// The iteration order is undefined.
+func (r *Files) RangeFiles(f func(protoreflect.FileDescriptor) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	for _, file := range r.filesByPath {
+		if !f(file) {
+			return
+		}
+	}
+}
+
+// NumFilesByPackage reports the number of registered files in a proto package.
+func (r *Files) NumFilesByPackage(name protoreflect.FullName) int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	p, ok := r.descsByName[name].(*packageDescriptor)
+	if !ok {
+		return 0
+	}
+	return len(p.files)
+}
+
+// RangeFilesByPackage iterates over all registered files in a given proto package
+// while f returns true. The iteration order is undefined.
+func (r *Files) RangeFilesByPackage(name protoreflect.FullName, f func(protoreflect.FileDescriptor) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalFiles {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	p, ok := r.descsByName[name].(*packageDescriptor)
+	if !ok {
+		return
+	}
+	for _, file := range p.files {
+		if !f(file) {
+			return
+		}
+	}
+}
+
+// rangeTopLevelDescriptors iterates over all top-level descriptors in a file
+// which will be directly entered into the registry.
+func rangeTopLevelDescriptors(fd protoreflect.FileDescriptor, f func(protoreflect.Descriptor)) {
+	eds := fd.Enums()
+	for i := eds.Len() - 1; i >= 0; i-- {
+		f(eds.Get(i))
+		vds := eds.Get(i).Values()
+		for i := vds.Len() - 1; i >= 0; i-- {
+			f(vds.Get(i))
+		}
+	}
+	mds := fd.Messages()
+	for i := mds.Len() - 1; i >= 0; i-- {
+		f(mds.Get(i))
+	}
+	xds := fd.Extensions()
+	for i := xds.Len() - 1; i >= 0; i-- {
+		f(xds.Get(i))
+	}
+	sds := fd.Services()
+	for i := sds.Len() - 1; i >= 0; i-- {
+		f(sds.Get(i))
+	}
+}
+
+// MessageTypeResolver is an interface for looking up messages.
+//
+// A compliant implementation must deterministically return the same type
+// if no error is encountered.
+//
+// The Types type implements this interface.
+type MessageTypeResolver interface {
+	// FindMessageByName looks up a message by its full name.
+	// E.g., "google.protobuf.Any"
+	//
+	// This return (nil, NotFound) if not found.
+	FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error)
+
+	// FindMessageByURL looks up a message by a URL identifier.
+	// See documentation on google.protobuf.Any.type_url for the URL format.
+	//
+	// This returns (nil, NotFound) if not found.
+	FindMessageByURL(url string) (protoreflect.MessageType, error)
+}
+
+// ExtensionTypeResolver is an interface for looking up extensions.
+//
+// A compliant implementation must deterministically return the same type
+// if no error is encountered.
+//
+// The Types type implements this interface.
+type ExtensionTypeResolver interface {
+	// FindExtensionByName looks up a extension field by the field's full name.
+	// Note that this is the full name of the field as determined by
+	// where the extension is declared and is unrelated to the full name of the
+	// message being extended.
+	//
+	// This returns (nil, NotFound) if not found.
+	FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
+
+	// FindExtensionByNumber looks up a extension field by the field number
+	// within some parent message, identified by full name.
+	//
+	// This returns (nil, NotFound) if not found.
+	FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
+}
+
+var (
+	_ MessageTypeResolver   = (*Types)(nil)
+	_ ExtensionTypeResolver = (*Types)(nil)
+)
+
+// Types is a registry for looking up or iterating over descriptor types.
+// The Find and Range methods are safe for concurrent use.
+type Types struct {
+	typesByName         typesByName
+	extensionsByMessage extensionsByMessage
+
+	numEnums      int
+	numMessages   int
+	numExtensions int
+}
+
+type (
+	typesByName         map[protoreflect.FullName]interface{}
+	extensionsByMessage map[protoreflect.FullName]extensionsByNumber
+	extensionsByNumber  map[protoreflect.FieldNumber]protoreflect.ExtensionType
+)
+
+// RegisterMessage registers the provided message type.
+//
+// If a naming conflict occurs, the type is not registered and an error is returned.
+func (r *Types) RegisterMessage(mt protoreflect.MessageType) error {
+	// Under rare circumstances getting the descriptor might recursively
+	// examine the registry, so fetch it before locking.
+	md := mt.Descriptor()
+
+	if r == GlobalTypes {
+		globalMutex.Lock()
+		defer globalMutex.Unlock()
+	}
+
+	if err := r.register("message", md, mt); err != nil {
+		return err
+	}
+	r.numMessages++
+	return nil
+}
+
+// RegisterEnum registers the provided enum type.
+//
+// If a naming conflict occurs, the type is not registered and an error is returned.
+func (r *Types) RegisterEnum(et protoreflect.EnumType) error {
+	// Under rare circumstances getting the descriptor might recursively
+	// examine the registry, so fetch it before locking.
+	ed := et.Descriptor()
+
+	if r == GlobalTypes {
+		globalMutex.Lock()
+		defer globalMutex.Unlock()
+	}
+
+	if err := r.register("enum", ed, et); err != nil {
+		return err
+	}
+	r.numEnums++
+	return nil
+}
+
+// RegisterExtension registers the provided extension type.
+//
+// If a naming conflict occurs, the type is not registered and an error is returned.
+func (r *Types) RegisterExtension(xt protoreflect.ExtensionType) error {
+	// Under rare circumstances getting the descriptor might recursively
+	// examine the registry, so fetch it before locking.
+	//
+	// A known case where this can happen: Fetching the TypeDescriptor for a
+	// legacy ExtensionDesc can consult the global registry.
+	xd := xt.TypeDescriptor()
+
+	if r == GlobalTypes {
+		globalMutex.Lock()
+		defer globalMutex.Unlock()
+	}
+
+	field := xd.Number()
+	message := xd.ContainingMessage().FullName()
+	if prev := r.extensionsByMessage[message][field]; prev != nil {
+		err := errors.New("extension number %d is already registered on message %v", field, message)
+		err = amendErrorWithCaller(err, prev, xt)
+		if !(r == GlobalTypes && ignoreConflict(xd, err)) {
+			return err
+		}
+	}
+
+	if err := r.register("extension", xd, xt); err != nil {
+		return err
+	}
+	if r.extensionsByMessage == nil {
+		r.extensionsByMessage = make(extensionsByMessage)
+	}
+	if r.extensionsByMessage[message] == nil {
+		r.extensionsByMessage[message] = make(extensionsByNumber)
+	}
+	r.extensionsByMessage[message][field] = xt
+	r.numExtensions++
+	return nil
+}
+
+func (r *Types) register(kind string, desc protoreflect.Descriptor, typ interface{}) error {
+	name := desc.FullName()
+	prev := r.typesByName[name]
+	if prev != nil {
+		err := errors.New("%v %v is already registered", kind, name)
+		err = amendErrorWithCaller(err, prev, typ)
+		if !(r == GlobalTypes && ignoreConflict(desc, err)) {
+			return err
+		}
+	}
+	if r.typesByName == nil {
+		r.typesByName = make(typesByName)
+	}
+	r.typesByName[name] = typ
+	return nil
+}
+
+// FindEnumByName looks up an enum by its full name.
+// E.g., "google.protobuf.Field.Kind".
+//
+// This returns (nil, NotFound) if not found.
+func (r *Types) FindEnumByName(enum protoreflect.FullName) (protoreflect.EnumType, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	if v := r.typesByName[enum]; v != nil {
+		if et, _ := v.(protoreflect.EnumType); et != nil {
+			return et, nil
+		}
+		return nil, errors.New("found wrong type: got %v, want enum", typeName(v))
+	}
+	return nil, NotFound
+}
+
+// FindMessageByName looks up a message by its full name.
+// E.g., "google.protobuf.Any"
+//
+// This return (nil, NotFound) if not found.
+func (r *Types) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
+	// The full name by itself is a valid URL.
+	return r.FindMessageByURL(string(message))
+}
+
+// FindMessageByURL looks up a message by a URL identifier.
+// See documentation on google.protobuf.Any.type_url for the URL format.
+//
+// This returns (nil, NotFound) if not found.
+func (r *Types) FindMessageByURL(url string) (protoreflect.MessageType, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	message := protoreflect.FullName(url)
+	if i := strings.LastIndexByte(url, '/'); i >= 0 {
+		message = message[i+len("/"):]
+	}
+
+	if v := r.typesByName[message]; v != nil {
+		if mt, _ := v.(protoreflect.MessageType); mt != nil {
+			return mt, nil
+		}
+		return nil, errors.New("found wrong type: got %v, want message", typeName(v))
+	}
+	return nil, NotFound
+}
+
+// FindExtensionByName looks up a extension field by the field's full name.
+// Note that this is the full name of the field as determined by
+// where the extension is declared and is unrelated to the full name of the
+// message being extended.
+//
+// This returns (nil, NotFound) if not found.
+func (r *Types) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	if v := r.typesByName[field]; v != nil {
+		if xt, _ := v.(protoreflect.ExtensionType); xt != nil {
+			return xt, nil
+		}
+		return nil, errors.New("found wrong type: got %v, want extension", typeName(v))
+	}
+	return nil, NotFound
+}
+
+// FindExtensionByNumber looks up a extension field by the field number
+// within some parent message, identified by full name.
+//
+// This returns (nil, NotFound) if not found.
+func (r *Types) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
+	if r == nil {
+		return nil, NotFound
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	if xt, ok := r.extensionsByMessage[message][field]; ok {
+		return xt, nil
+	}
+	return nil, NotFound
+}
+
+// NumEnums reports the number of registered enums.
+func (r *Types) NumEnums() int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	return r.numEnums
+}
+
+// RangeEnums iterates over all registered enums while f returns true.
+// Iteration order is undefined.
+func (r *Types) RangeEnums(f func(protoreflect.EnumType) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	for _, typ := range r.typesByName {
+		if et, ok := typ.(protoreflect.EnumType); ok {
+			if !f(et) {
+				return
+			}
+		}
+	}
+}
+
+// NumMessages reports the number of registered messages.
+func (r *Types) NumMessages() int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	return r.numMessages
+}
+
+// RangeMessages iterates over all registered messages while f returns true.
+// Iteration order is undefined.
+func (r *Types) RangeMessages(f func(protoreflect.MessageType) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	for _, typ := range r.typesByName {
+		if mt, ok := typ.(protoreflect.MessageType); ok {
+			if !f(mt) {
+				return
+			}
+		}
+	}
+}
+
+// NumExtensions reports the number of registered extensions.
+func (r *Types) NumExtensions() int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	return r.numExtensions
+}
+
+// RangeExtensions iterates over all registered extensions while f returns true.
+// Iteration order is undefined.
+func (r *Types) RangeExtensions(f func(protoreflect.ExtensionType) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	for _, typ := range r.typesByName {
+		if xt, ok := typ.(protoreflect.ExtensionType); ok {
+			if !f(xt) {
+				return
+			}
+		}
+	}
+}
+
+// NumExtensionsByMessage reports the number of registered extensions for
+// a given message type.
+func (r *Types) NumExtensionsByMessage(message protoreflect.FullName) int {
+	if r == nil {
+		return 0
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	return len(r.extensionsByMessage[message])
+}
+
+// RangeExtensionsByMessage iterates over all registered extensions filtered
+// by a given message type while f returns true. Iteration order is undefined.
+func (r *Types) RangeExtensionsByMessage(message protoreflect.FullName, f func(protoreflect.ExtensionType) bool) {
+	if r == nil {
+		return
+	}
+	if r == GlobalTypes {
+		globalMutex.RLock()
+		defer globalMutex.RUnlock()
+	}
+	for _, xt := range r.extensionsByMessage[message] {
+		if !f(xt) {
+			return
+		}
+	}
+}
+
+func typeName(t interface{}) string {
+	switch t.(type) {
+	case protoreflect.EnumType:
+		return "enum"
+	case protoreflect.MessageType:
+		return "message"
+	case protoreflect.ExtensionType:
+		return "extension"
+	default:
+		return fmt.Sprintf("%T", t)
+	}
+}
+
+func amendErrorWithCaller(err error, prev, curr interface{}) error {
+	prevPkg := goPackage(prev)
+	currPkg := goPackage(curr)
+	if prevPkg == "" || currPkg == "" || prevPkg == currPkg {
+		return err
+	}
+	return errors.New("%s\n\tpreviously from: %q\n\tcurrently from:  %q", err, prevPkg, currPkg)
+}
+
+func goPackage(v interface{}) string {
+	switch d := v.(type) {
+	case protoreflect.EnumType:
+		v = d.Descriptor()
+	case protoreflect.MessageType:
+		v = d.Descriptor()
+	case protoreflect.ExtensionType:
+		v = d.TypeDescriptor()
+	}
+	if d, ok := v.(protoreflect.Descriptor); ok {
+		v = d.ParentFile()
+	}
+	if d, ok := v.(interface{ GoPackagePath() string }); ok {
+		return d.GoPackagePath()
+	}
+	return ""
+}
diff --git a/vendor/google.golang.org/protobuf/runtime/protoiface/legacy.go b/vendor/google.golang.org/protobuf/runtime/protoiface/legacy.go
new file mode 100644
index 0000000..c587276
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/runtime/protoiface/legacy.go
@@ -0,0 +1,15 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoiface
+
+type MessageV1 interface {
+	Reset()
+	String() string
+	ProtoMessage()
+}
+
+type ExtensionRangeV1 struct {
+	Start, End int32 // both inclusive
+}
diff --git a/vendor/google.golang.org/protobuf/runtime/protoiface/methods.go b/vendor/google.golang.org/protobuf/runtime/protoiface/methods.go
new file mode 100644
index 0000000..32c04f6
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/runtime/protoiface/methods.go
@@ -0,0 +1,167 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protoiface contains types referenced or implemented by messages.
+//
+// WARNING: This package should only be imported by message implementations.
+// The functionality found in this package should be accessed through
+// higher-level abstractions provided by the proto package.
+package protoiface
+
+import (
+	"google.golang.org/protobuf/internal/pragma"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// Methods is a set of optional fast-path implementations of various operations.
+type Methods = struct {
+	pragma.NoUnkeyedLiterals
+
+	// Flags indicate support for optional features.
+	Flags SupportFlags
+
+	// Size returns the size in bytes of the wire-format encoding of a message.
+	// Marshal must be provided if a custom Size is provided.
+	Size func(SizeInput) SizeOutput
+
+	// Marshal formats a message in the wire-format encoding to the provided buffer.
+	// Size should be provided if a custom Marshal is provided.
+	// It must not return an error for a partial message.
+	Marshal func(MarshalInput) (MarshalOutput, error)
+
+	// Unmarshal parses the wire-format encoding and merges the result into a message.
+	// It must not reset the target message or return an error for a partial message.
+	Unmarshal func(UnmarshalInput) (UnmarshalOutput, error)
+
+	// Merge merges the contents of a source message into a destination message.
+	Merge func(MergeInput) MergeOutput
+
+	// CheckInitialized returns an error if any required fields in the message are not set.
+	CheckInitialized func(CheckInitializedInput) (CheckInitializedOutput, error)
+}
+
+// SupportFlags indicate support for optional features.
+type SupportFlags = uint64
+
+const (
+	// SupportMarshalDeterministic reports whether MarshalOptions.Deterministic is supported.
+	SupportMarshalDeterministic SupportFlags = 1 << iota
+
+	// SupportUnmarshalDiscardUnknown reports whether UnmarshalOptions.DiscardUnknown is supported.
+	SupportUnmarshalDiscardUnknown
+)
+
+// SizeInput is input to the Size method.
+type SizeInput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Message protoreflect.Message
+	Flags   MarshalInputFlags
+}
+
+// SizeOutput is output from the Size method.
+type SizeOutput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Size int
+}
+
+// MarshalInput is input to the Marshal method.
+type MarshalInput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Message protoreflect.Message
+	Buf     []byte // output is appended to this buffer
+	Flags   MarshalInputFlags
+}
+
+// MarshalOutput is output from the Marshal method.
+type MarshalOutput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Buf []byte // contains marshaled message
+}
+
+// MarshalInputFlags configure the marshaler.
+// Most flags correspond to fields in proto.MarshalOptions.
+type MarshalInputFlags = uint8
+
+const (
+	MarshalDeterministic MarshalInputFlags = 1 << iota
+	MarshalUseCachedSize
+)
+
+// UnmarshalInput is input to the Unmarshal method.
+type UnmarshalInput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Message  protoreflect.Message
+	Buf      []byte // input buffer
+	Flags    UnmarshalInputFlags
+	Resolver interface {
+		FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error)
+		FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error)
+	}
+}
+
+// UnmarshalOutput is output from the Unmarshal method.
+type UnmarshalOutput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Flags UnmarshalOutputFlags
+}
+
+// UnmarshalInputFlags configure the unmarshaler.
+// Most flags correspond to fields in proto.UnmarshalOptions.
+type UnmarshalInputFlags = uint8
+
+const (
+	UnmarshalDiscardUnknown UnmarshalInputFlags = 1 << iota
+)
+
+// UnmarshalOutputFlags are output from the Unmarshal method.
+type UnmarshalOutputFlags = uint8
+
+const (
+	// UnmarshalInitialized may be set on return if all required fields are known to be set.
+	// If unset, then it does not necessarily indicate that the message is uninitialized,
+	// only that its status could not be confirmed.
+	UnmarshalInitialized UnmarshalOutputFlags = 1 << iota
+)
+
+// MergeInput is input to the Merge method.
+type MergeInput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Source      protoreflect.Message
+	Destination protoreflect.Message
+}
+
+// MergeOutput is output from the Merge method.
+type MergeOutput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Flags MergeOutputFlags
+}
+
+// MergeOutputFlags are output from the Merge method.
+type MergeOutputFlags = uint8
+
+const (
+	// MergeComplete reports whether the merge was performed.
+	// If unset, the merger must have made no changes to the destination.
+	MergeComplete MergeOutputFlags = 1 << iota
+)
+
+// CheckInitializedInput is input to the CheckInitialized method.
+type CheckInitializedInput = struct {
+	pragma.NoUnkeyedLiterals
+
+	Message protoreflect.Message
+}
+
+// CheckInitializedOutput is output from the CheckInitialized method.
+type CheckInitializedOutput = struct {
+	pragma.NoUnkeyedLiterals
+}
diff --git a/vendor/google.golang.org/protobuf/runtime/protoimpl/impl.go b/vendor/google.golang.org/protobuf/runtime/protoimpl/impl.go
new file mode 100644
index 0000000..4a1ab7f
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/runtime/protoimpl/impl.go
@@ -0,0 +1,44 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protoimpl contains the default implementation for messages
+// generated by protoc-gen-go.
+//
+// WARNING: This package should only ever be imported by generated messages.
+// The compatibility agreement covers nothing except for functionality needed
+// to keep existing generated messages operational. Breakages that occur due
+// to unauthorized usages of this package are not the author's responsibility.
+package protoimpl
+
+import (
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/internal/filetype"
+	"google.golang.org/protobuf/internal/impl"
+)
+
+// UnsafeEnabled specifies whether package unsafe can be used.
+const UnsafeEnabled = impl.UnsafeEnabled
+
+type (
+	// Types used by generated code in init functions.
+	DescBuilder = filedesc.Builder
+	TypeBuilder = filetype.Builder
+
+	// Types used by generated code to implement EnumType, MessageType, and ExtensionType.
+	EnumInfo      = impl.EnumInfo
+	MessageInfo   = impl.MessageInfo
+	ExtensionInfo = impl.ExtensionInfo
+
+	// Types embedded in generated messages.
+	MessageState     = impl.MessageState
+	SizeCache        = impl.SizeCache
+	WeakFields       = impl.WeakFields
+	UnknownFields    = impl.UnknownFields
+	ExtensionFields  = impl.ExtensionFields
+	ExtensionFieldV1 = impl.ExtensionField
+
+	Pointer = impl.Pointer
+)
+
+var X impl.Export
diff --git a/vendor/google.golang.org/protobuf/runtime/protoimpl/version.go b/vendor/google.golang.org/protobuf/runtime/protoimpl/version.go
new file mode 100644
index 0000000..ff094e1
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/runtime/protoimpl/version.go
@@ -0,0 +1,56 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protoimpl
+
+import (
+	"google.golang.org/protobuf/internal/version"
+)
+
+const (
+	// MaxVersion is the maximum supported version for generated .pb.go files.
+	// It is always the current version of the module.
+	MaxVersion = version.Minor
+
+	// GenVersion is the runtime version required by generated .pb.go files.
+	// This is incremented when generated code relies on new functionality
+	// in the runtime.
+	GenVersion = 20
+
+	// MinVersion is the minimum supported version for generated .pb.go files.
+	// This is incremented when the runtime drops support for old code.
+	MinVersion = 0
+)
+
+// EnforceVersion is used by code generated by protoc-gen-go
+// to statically enforce minimum and maximum versions of this package.
+// A compilation failure implies either that:
+//	* the runtime package is too old and needs to be updated OR
+//	* the generated code is too old and needs to be regenerated.
+//
+// The runtime package can be upgraded by running:
+//	go get google.golang.org/protobuf
+//
+// The generated code can be regenerated by running:
+//	protoc --go_out=${PROTOC_GEN_GO_ARGS} ${PROTO_FILES}
+//
+// Example usage by generated code:
+//	const (
+//		// Verify that this generated code is sufficiently up-to-date.
+//		_ = protoimpl.EnforceVersion(genVersion - protoimpl.MinVersion)
+//		// Verify that runtime/protoimpl is sufficiently up-to-date.
+//		_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - genVersion)
+//	)
+//
+// The genVersion is the current minor version used to generated the code.
+// This compile-time check relies on negative integer overflow of a uint
+// being a compilation failure (guaranteed by the Go specification).
+type EnforceVersion uint
+
+// This enforces the following invariant:
+//	MinVersion ≤ GenVersion ≤ MaxVersion
+const (
+	_ = EnforceVersion(GenVersion - MinVersion)
+	_ = EnforceVersion(MaxVersion - GenVersion)
+)
diff --git a/vendor/google.golang.org/protobuf/types/descriptorpb/descriptor.pb.go b/vendor/google.golang.org/protobuf/types/descriptorpb/descriptor.pb.go
new file mode 100644
index 0000000..8242378
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/types/descriptorpb/descriptor.pb.go
@@ -0,0 +1,4040 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+//  Based on original Protocol Buffers design by
+//  Sanjay Ghemawat, Jeff Dean, and others.
+//
+// The messages in this file describe the definitions found in .proto files.
+// A valid .proto file can be translated directly to a FileDescriptorProto
+// without any other information (e.g. without reading its imports).
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/protobuf/descriptor.proto
+
+package descriptorpb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoiface "google.golang.org/protobuf/runtime/protoiface"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+type FieldDescriptorProto_Type int32
+
+const (
+	// 0 is reserved for errors.
+	// Order is weird for historical reasons.
+	FieldDescriptorProto_TYPE_DOUBLE FieldDescriptorProto_Type = 1
+	FieldDescriptorProto_TYPE_FLOAT  FieldDescriptorProto_Type = 2
+	// Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
+	// negative values are likely.
+	FieldDescriptorProto_TYPE_INT64  FieldDescriptorProto_Type = 3
+	FieldDescriptorProto_TYPE_UINT64 FieldDescriptorProto_Type = 4
+	// Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
+	// negative values are likely.
+	FieldDescriptorProto_TYPE_INT32   FieldDescriptorProto_Type = 5
+	FieldDescriptorProto_TYPE_FIXED64 FieldDescriptorProto_Type = 6
+	FieldDescriptorProto_TYPE_FIXED32 FieldDescriptorProto_Type = 7
+	FieldDescriptorProto_TYPE_BOOL    FieldDescriptorProto_Type = 8
+	FieldDescriptorProto_TYPE_STRING  FieldDescriptorProto_Type = 9
+	// Tag-delimited aggregate.
+	// Group type is deprecated and not supported in proto3. However, Proto3
+	// implementations should still be able to parse the group wire format and
+	// treat group fields as unknown fields.
+	FieldDescriptorProto_TYPE_GROUP   FieldDescriptorProto_Type = 10
+	FieldDescriptorProto_TYPE_MESSAGE FieldDescriptorProto_Type = 11 // Length-delimited aggregate.
+	// New in version 2.
+	FieldDescriptorProto_TYPE_BYTES    FieldDescriptorProto_Type = 12
+	FieldDescriptorProto_TYPE_UINT32   FieldDescriptorProto_Type = 13
+	FieldDescriptorProto_TYPE_ENUM     FieldDescriptorProto_Type = 14
+	FieldDescriptorProto_TYPE_SFIXED32 FieldDescriptorProto_Type = 15
+	FieldDescriptorProto_TYPE_SFIXED64 FieldDescriptorProto_Type = 16
+	FieldDescriptorProto_TYPE_SINT32   FieldDescriptorProto_Type = 17 // Uses ZigZag encoding.
+	FieldDescriptorProto_TYPE_SINT64   FieldDescriptorProto_Type = 18 // Uses ZigZag encoding.
+)
+
+// Enum value maps for FieldDescriptorProto_Type.
+var (
+	FieldDescriptorProto_Type_name = map[int32]string{
+		1:  "TYPE_DOUBLE",
+		2:  "TYPE_FLOAT",
+		3:  "TYPE_INT64",
+		4:  "TYPE_UINT64",
+		5:  "TYPE_INT32",
+		6:  "TYPE_FIXED64",
+		7:  "TYPE_FIXED32",
+		8:  "TYPE_BOOL",
+		9:  "TYPE_STRING",
+		10: "TYPE_GROUP",
+		11: "TYPE_MESSAGE",
+		12: "TYPE_BYTES",
+		13: "TYPE_UINT32",
+		14: "TYPE_ENUM",
+		15: "TYPE_SFIXED32",
+		16: "TYPE_SFIXED64",
+		17: "TYPE_SINT32",
+		18: "TYPE_SINT64",
+	}
+	FieldDescriptorProto_Type_value = map[string]int32{
+		"TYPE_DOUBLE":   1,
+		"TYPE_FLOAT":    2,
+		"TYPE_INT64":    3,
+		"TYPE_UINT64":   4,
+		"TYPE_INT32":    5,
+		"TYPE_FIXED64":  6,
+		"TYPE_FIXED32":  7,
+		"TYPE_BOOL":     8,
+		"TYPE_STRING":   9,
+		"TYPE_GROUP":    10,
+		"TYPE_MESSAGE":  11,
+		"TYPE_BYTES":    12,
+		"TYPE_UINT32":   13,
+		"TYPE_ENUM":     14,
+		"TYPE_SFIXED32": 15,
+		"TYPE_SFIXED64": 16,
+		"TYPE_SINT32":   17,
+		"TYPE_SINT64":   18,
+	}
+)
+
+func (x FieldDescriptorProto_Type) Enum() *FieldDescriptorProto_Type {
+	p := new(FieldDescriptorProto_Type)
+	*p = x
+	return p
+}
+
+func (x FieldDescriptorProto_Type) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FieldDescriptorProto_Type) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[0].Descriptor()
+}
+
+func (FieldDescriptorProto_Type) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[0]
+}
+
+func (x FieldDescriptorProto_Type) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *FieldDescriptorProto_Type) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = FieldDescriptorProto_Type(num)
+	return nil
+}
+
+// Deprecated: Use FieldDescriptorProto_Type.Descriptor instead.
+func (FieldDescriptorProto_Type) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{4, 0}
+}
+
+type FieldDescriptorProto_Label int32
+
+const (
+	// 0 is reserved for errors
+	FieldDescriptorProto_LABEL_OPTIONAL FieldDescriptorProto_Label = 1
+	FieldDescriptorProto_LABEL_REQUIRED FieldDescriptorProto_Label = 2
+	FieldDescriptorProto_LABEL_REPEATED FieldDescriptorProto_Label = 3
+)
+
+// Enum value maps for FieldDescriptorProto_Label.
+var (
+	FieldDescriptorProto_Label_name = map[int32]string{
+		1: "LABEL_OPTIONAL",
+		2: "LABEL_REQUIRED",
+		3: "LABEL_REPEATED",
+	}
+	FieldDescriptorProto_Label_value = map[string]int32{
+		"LABEL_OPTIONAL": 1,
+		"LABEL_REQUIRED": 2,
+		"LABEL_REPEATED": 3,
+	}
+)
+
+func (x FieldDescriptorProto_Label) Enum() *FieldDescriptorProto_Label {
+	p := new(FieldDescriptorProto_Label)
+	*p = x
+	return p
+}
+
+func (x FieldDescriptorProto_Label) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FieldDescriptorProto_Label) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[1].Descriptor()
+}
+
+func (FieldDescriptorProto_Label) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[1]
+}
+
+func (x FieldDescriptorProto_Label) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *FieldDescriptorProto_Label) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = FieldDescriptorProto_Label(num)
+	return nil
+}
+
+// Deprecated: Use FieldDescriptorProto_Label.Descriptor instead.
+func (FieldDescriptorProto_Label) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{4, 1}
+}
+
+// Generated classes can be optimized for speed or code size.
+type FileOptions_OptimizeMode int32
+
+const (
+	FileOptions_SPEED FileOptions_OptimizeMode = 1 // Generate complete code for parsing, serialization,
+	// etc.
+	FileOptions_CODE_SIZE    FileOptions_OptimizeMode = 2 // Use ReflectionOps to implement these methods.
+	FileOptions_LITE_RUNTIME FileOptions_OptimizeMode = 3 // Generate code using MessageLite and the lite runtime.
+)
+
+// Enum value maps for FileOptions_OptimizeMode.
+var (
+	FileOptions_OptimizeMode_name = map[int32]string{
+		1: "SPEED",
+		2: "CODE_SIZE",
+		3: "LITE_RUNTIME",
+	}
+	FileOptions_OptimizeMode_value = map[string]int32{
+		"SPEED":        1,
+		"CODE_SIZE":    2,
+		"LITE_RUNTIME": 3,
+	}
+)
+
+func (x FileOptions_OptimizeMode) Enum() *FileOptions_OptimizeMode {
+	p := new(FileOptions_OptimizeMode)
+	*p = x
+	return p
+}
+
+func (x FileOptions_OptimizeMode) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FileOptions_OptimizeMode) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[2].Descriptor()
+}
+
+func (FileOptions_OptimizeMode) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[2]
+}
+
+func (x FileOptions_OptimizeMode) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *FileOptions_OptimizeMode) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = FileOptions_OptimizeMode(num)
+	return nil
+}
+
+// Deprecated: Use FileOptions_OptimizeMode.Descriptor instead.
+func (FileOptions_OptimizeMode) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{10, 0}
+}
+
+type FieldOptions_CType int32
+
+const (
+	// Default mode.
+	FieldOptions_STRING       FieldOptions_CType = 0
+	FieldOptions_CORD         FieldOptions_CType = 1
+	FieldOptions_STRING_PIECE FieldOptions_CType = 2
+)
+
+// Enum value maps for FieldOptions_CType.
+var (
+	FieldOptions_CType_name = map[int32]string{
+		0: "STRING",
+		1: "CORD",
+		2: "STRING_PIECE",
+	}
+	FieldOptions_CType_value = map[string]int32{
+		"STRING":       0,
+		"CORD":         1,
+		"STRING_PIECE": 2,
+	}
+)
+
+func (x FieldOptions_CType) Enum() *FieldOptions_CType {
+	p := new(FieldOptions_CType)
+	*p = x
+	return p
+}
+
+func (x FieldOptions_CType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FieldOptions_CType) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[3].Descriptor()
+}
+
+func (FieldOptions_CType) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[3]
+}
+
+func (x FieldOptions_CType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *FieldOptions_CType) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = FieldOptions_CType(num)
+	return nil
+}
+
+// Deprecated: Use FieldOptions_CType.Descriptor instead.
+func (FieldOptions_CType) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{12, 0}
+}
+
+type FieldOptions_JSType int32
+
+const (
+	// Use the default type.
+	FieldOptions_JS_NORMAL FieldOptions_JSType = 0
+	// Use JavaScript strings.
+	FieldOptions_JS_STRING FieldOptions_JSType = 1
+	// Use JavaScript numbers.
+	FieldOptions_JS_NUMBER FieldOptions_JSType = 2
+)
+
+// Enum value maps for FieldOptions_JSType.
+var (
+	FieldOptions_JSType_name = map[int32]string{
+		0: "JS_NORMAL",
+		1: "JS_STRING",
+		2: "JS_NUMBER",
+	}
+	FieldOptions_JSType_value = map[string]int32{
+		"JS_NORMAL": 0,
+		"JS_STRING": 1,
+		"JS_NUMBER": 2,
+	}
+)
+
+func (x FieldOptions_JSType) Enum() *FieldOptions_JSType {
+	p := new(FieldOptions_JSType)
+	*p = x
+	return p
+}
+
+func (x FieldOptions_JSType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FieldOptions_JSType) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[4].Descriptor()
+}
+
+func (FieldOptions_JSType) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[4]
+}
+
+func (x FieldOptions_JSType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *FieldOptions_JSType) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = FieldOptions_JSType(num)
+	return nil
+}
+
+// Deprecated: Use FieldOptions_JSType.Descriptor instead.
+func (FieldOptions_JSType) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{12, 1}
+}
+
+// Is this method side-effect-free (or safe in HTTP parlance), or idempotent,
+// or neither? HTTP based RPC implementation may choose GET verb for safe
+// methods, and PUT verb for idempotent methods instead of the default POST.
+type MethodOptions_IdempotencyLevel int32
+
+const (
+	MethodOptions_IDEMPOTENCY_UNKNOWN MethodOptions_IdempotencyLevel = 0
+	MethodOptions_NO_SIDE_EFFECTS     MethodOptions_IdempotencyLevel = 1 // implies idempotent
+	MethodOptions_IDEMPOTENT          MethodOptions_IdempotencyLevel = 2 // idempotent, but may have side effects
+)
+
+// Enum value maps for MethodOptions_IdempotencyLevel.
+var (
+	MethodOptions_IdempotencyLevel_name = map[int32]string{
+		0: "IDEMPOTENCY_UNKNOWN",
+		1: "NO_SIDE_EFFECTS",
+		2: "IDEMPOTENT",
+	}
+	MethodOptions_IdempotencyLevel_value = map[string]int32{
+		"IDEMPOTENCY_UNKNOWN": 0,
+		"NO_SIDE_EFFECTS":     1,
+		"IDEMPOTENT":          2,
+	}
+)
+
+func (x MethodOptions_IdempotencyLevel) Enum() *MethodOptions_IdempotencyLevel {
+	p := new(MethodOptions_IdempotencyLevel)
+	*p = x
+	return p
+}
+
+func (x MethodOptions_IdempotencyLevel) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (MethodOptions_IdempotencyLevel) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_descriptor_proto_enumTypes[5].Descriptor()
+}
+
+func (MethodOptions_IdempotencyLevel) Type() protoreflect.EnumType {
+	return &file_google_protobuf_descriptor_proto_enumTypes[5]
+}
+
+func (x MethodOptions_IdempotencyLevel) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *MethodOptions_IdempotencyLevel) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = MethodOptions_IdempotencyLevel(num)
+	return nil
+}
+
+// Deprecated: Use MethodOptions_IdempotencyLevel.Descriptor instead.
+func (MethodOptions_IdempotencyLevel) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{17, 0}
+}
+
+// The protocol compiler can output a FileDescriptorSet containing the .proto
+// files it parses.
+type FileDescriptorSet struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	File []*FileDescriptorProto `protobuf:"bytes,1,rep,name=file" json:"file,omitempty"`
+}
+
+func (x *FileDescriptorSet) Reset() {
+	*x = FileDescriptorSet{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FileDescriptorSet) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FileDescriptorSet) ProtoMessage() {}
+
+func (x *FileDescriptorSet) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FileDescriptorSet.ProtoReflect.Descriptor instead.
+func (*FileDescriptorSet) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *FileDescriptorSet) GetFile() []*FileDescriptorProto {
+	if x != nil {
+		return x.File
+	}
+	return nil
+}
+
+// Describes a complete .proto file.
+type FileDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name    *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`       // file name, relative to root of source tree
+	Package *string `protobuf:"bytes,2,opt,name=package" json:"package,omitempty"` // e.g. "foo", "foo.bar", etc.
+	// Names of files imported by this file.
+	Dependency []string `protobuf:"bytes,3,rep,name=dependency" json:"dependency,omitempty"`
+	// Indexes of the public imported files in the dependency list above.
+	PublicDependency []int32 `protobuf:"varint,10,rep,name=public_dependency,json=publicDependency" json:"public_dependency,omitempty"`
+	// Indexes of the weak imported files in the dependency list.
+	// For Google-internal migration only. Do not use.
+	WeakDependency []int32 `protobuf:"varint,11,rep,name=weak_dependency,json=weakDependency" json:"weak_dependency,omitempty"`
+	// All top-level definitions in this file.
+	MessageType []*DescriptorProto        `protobuf:"bytes,4,rep,name=message_type,json=messageType" json:"message_type,omitempty"`
+	EnumType    []*EnumDescriptorProto    `protobuf:"bytes,5,rep,name=enum_type,json=enumType" json:"enum_type,omitempty"`
+	Service     []*ServiceDescriptorProto `protobuf:"bytes,6,rep,name=service" json:"service,omitempty"`
+	Extension   []*FieldDescriptorProto   `protobuf:"bytes,7,rep,name=extension" json:"extension,omitempty"`
+	Options     *FileOptions              `protobuf:"bytes,8,opt,name=options" json:"options,omitempty"`
+	// This field contains optional information about the original source code.
+	// You may safely remove this entire field without harming runtime
+	// functionality of the descriptors -- the information is needed only by
+	// development tools.
+	SourceCodeInfo *SourceCodeInfo `protobuf:"bytes,9,opt,name=source_code_info,json=sourceCodeInfo" json:"source_code_info,omitempty"`
+	// The syntax of the proto file.
+	// The supported values are "proto2" and "proto3".
+	Syntax *string `protobuf:"bytes,12,opt,name=syntax" json:"syntax,omitempty"`
+}
+
+func (x *FileDescriptorProto) Reset() {
+	*x = FileDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FileDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FileDescriptorProto) ProtoMessage() {}
+
+func (x *FileDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FileDescriptorProto.ProtoReflect.Descriptor instead.
+func (*FileDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *FileDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *FileDescriptorProto) GetPackage() string {
+	if x != nil && x.Package != nil {
+		return *x.Package
+	}
+	return ""
+}
+
+func (x *FileDescriptorProto) GetDependency() []string {
+	if x != nil {
+		return x.Dependency
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetPublicDependency() []int32 {
+	if x != nil {
+		return x.PublicDependency
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetWeakDependency() []int32 {
+	if x != nil {
+		return x.WeakDependency
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetMessageType() []*DescriptorProto {
+	if x != nil {
+		return x.MessageType
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetEnumType() []*EnumDescriptorProto {
+	if x != nil {
+		return x.EnumType
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetService() []*ServiceDescriptorProto {
+	if x != nil {
+		return x.Service
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetExtension() []*FieldDescriptorProto {
+	if x != nil {
+		return x.Extension
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetOptions() *FileOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetSourceCodeInfo() *SourceCodeInfo {
+	if x != nil {
+		return x.SourceCodeInfo
+	}
+	return nil
+}
+
+func (x *FileDescriptorProto) GetSyntax() string {
+	if x != nil && x.Syntax != nil {
+		return *x.Syntax
+	}
+	return ""
+}
+
+// Describes a message type.
+type DescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name           *string                           `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Field          []*FieldDescriptorProto           `protobuf:"bytes,2,rep,name=field" json:"field,omitempty"`
+	Extension      []*FieldDescriptorProto           `protobuf:"bytes,6,rep,name=extension" json:"extension,omitempty"`
+	NestedType     []*DescriptorProto                `protobuf:"bytes,3,rep,name=nested_type,json=nestedType" json:"nested_type,omitempty"`
+	EnumType       []*EnumDescriptorProto            `protobuf:"bytes,4,rep,name=enum_type,json=enumType" json:"enum_type,omitempty"`
+	ExtensionRange []*DescriptorProto_ExtensionRange `protobuf:"bytes,5,rep,name=extension_range,json=extensionRange" json:"extension_range,omitempty"`
+	OneofDecl      []*OneofDescriptorProto           `protobuf:"bytes,8,rep,name=oneof_decl,json=oneofDecl" json:"oneof_decl,omitempty"`
+	Options        *MessageOptions                   `protobuf:"bytes,7,opt,name=options" json:"options,omitempty"`
+	ReservedRange  []*DescriptorProto_ReservedRange  `protobuf:"bytes,9,rep,name=reserved_range,json=reservedRange" json:"reserved_range,omitempty"`
+	// Reserved field names, which may not be used by fields in the same message.
+	// A given name may only be reserved once.
+	ReservedName []string `protobuf:"bytes,10,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
+}
+
+func (x *DescriptorProto) Reset() {
+	*x = DescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DescriptorProto) ProtoMessage() {}
+
+func (x *DescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DescriptorProto.ProtoReflect.Descriptor instead.
+func (*DescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *DescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *DescriptorProto) GetField() []*FieldDescriptorProto {
+	if x != nil {
+		return x.Field
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetExtension() []*FieldDescriptorProto {
+	if x != nil {
+		return x.Extension
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetNestedType() []*DescriptorProto {
+	if x != nil {
+		return x.NestedType
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetEnumType() []*EnumDescriptorProto {
+	if x != nil {
+		return x.EnumType
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetExtensionRange() []*DescriptorProto_ExtensionRange {
+	if x != nil {
+		return x.ExtensionRange
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetOneofDecl() []*OneofDescriptorProto {
+	if x != nil {
+		return x.OneofDecl
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetOptions() *MessageOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetReservedRange() []*DescriptorProto_ReservedRange {
+	if x != nil {
+		return x.ReservedRange
+	}
+	return nil
+}
+
+func (x *DescriptorProto) GetReservedName() []string {
+	if x != nil {
+		return x.ReservedName
+	}
+	return nil
+}
+
+type ExtensionRangeOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+func (x *ExtensionRangeOptions) Reset() {
+	*x = ExtensionRangeOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ExtensionRangeOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ExtensionRangeOptions) ProtoMessage() {}
+
+func (x *ExtensionRangeOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ExtensionRangeOptions.ProtoReflect.Descriptor instead.
+func (*ExtensionRangeOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{3}
+}
+
+var extRange_ExtensionRangeOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use ExtensionRangeOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*ExtensionRangeOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_ExtensionRangeOptions
+}
+
+func (x *ExtensionRangeOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+// Describes a field within a message.
+type FieldDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name   *string                     `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Number *int32                      `protobuf:"varint,3,opt,name=number" json:"number,omitempty"`
+	Label  *FieldDescriptorProto_Label `protobuf:"varint,4,opt,name=label,enum=google.protobuf.FieldDescriptorProto_Label" json:"label,omitempty"`
+	// If type_name is set, this need not be set.  If both this and type_name
+	// are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.
+	Type *FieldDescriptorProto_Type `protobuf:"varint,5,opt,name=type,enum=google.protobuf.FieldDescriptorProto_Type" json:"type,omitempty"`
+	// For message and enum types, this is the name of the type.  If the name
+	// starts with a '.', it is fully-qualified.  Otherwise, C++-like scoping
+	// rules are used to find the type (i.e. first the nested types within this
+	// message are searched, then within the parent, on up to the root
+	// namespace).
+	TypeName *string `protobuf:"bytes,6,opt,name=type_name,json=typeName" json:"type_name,omitempty"`
+	// For extensions, this is the name of the type being extended.  It is
+	// resolved in the same manner as type_name.
+	Extendee *string `protobuf:"bytes,2,opt,name=extendee" json:"extendee,omitempty"`
+	// For numeric types, contains the original text representation of the value.
+	// For booleans, "true" or "false".
+	// For strings, contains the default text contents (not escaped in any way).
+	// For bytes, contains the C escaped value.  All bytes >= 128 are escaped.
+	// TODO(kenton):  Base-64 encode?
+	DefaultValue *string `protobuf:"bytes,7,opt,name=default_value,json=defaultValue" json:"default_value,omitempty"`
+	// If set, gives the index of a oneof in the containing type's oneof_decl
+	// list.  This field is a member of that oneof.
+	OneofIndex *int32 `protobuf:"varint,9,opt,name=oneof_index,json=oneofIndex" json:"oneof_index,omitempty"`
+	// JSON name of this field. The value is set by protocol compiler. If the
+	// user has set a "json_name" option on this field, that option's value
+	// will be used. Otherwise, it's deduced from the field's name by converting
+	// it to camelCase.
+	JsonName *string       `protobuf:"bytes,10,opt,name=json_name,json=jsonName" json:"json_name,omitempty"`
+	Options  *FieldOptions `protobuf:"bytes,8,opt,name=options" json:"options,omitempty"`
+	// If true, this is a proto3 "optional". When a proto3 field is optional, it
+	// tracks presence regardless of field type.
+	//
+	// When proto3_optional is true, this field must be belong to a oneof to
+	// signal to old proto3 clients that presence is tracked for this field. This
+	// oneof is known as a "synthetic" oneof, and this field must be its sole
+	// member (each proto3 optional field gets its own synthetic oneof). Synthetic
+	// oneofs exist in the descriptor only, and do not generate any API. Synthetic
+	// oneofs must be ordered after all "real" oneofs.
+	//
+	// For message fields, proto3_optional doesn't create any semantic change,
+	// since non-repeated message fields always track presence. However it still
+	// indicates the semantic detail of whether the user wrote "optional" or not.
+	// This can be useful for round-tripping the .proto file. For consistency we
+	// give message fields a synthetic oneof also, even though it is not required
+	// to track presence. This is especially important because the parser can't
+	// tell if a field is a message or an enum, so it must always create a
+	// synthetic oneof.
+	//
+	// Proto2 optional fields do not set this flag, because they already indicate
+	// optional with `LABEL_OPTIONAL`.
+	Proto3Optional *bool `protobuf:"varint,17,opt,name=proto3_optional,json=proto3Optional" json:"proto3_optional,omitempty"`
+}
+
+func (x *FieldDescriptorProto) Reset() {
+	*x = FieldDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FieldDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FieldDescriptorProto) ProtoMessage() {}
+
+func (x *FieldDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FieldDescriptorProto.ProtoReflect.Descriptor instead.
+func (*FieldDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *FieldDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *FieldDescriptorProto) GetNumber() int32 {
+	if x != nil && x.Number != nil {
+		return *x.Number
+	}
+	return 0
+}
+
+func (x *FieldDescriptorProto) GetLabel() FieldDescriptorProto_Label {
+	if x != nil && x.Label != nil {
+		return *x.Label
+	}
+	return FieldDescriptorProto_LABEL_OPTIONAL
+}
+
+func (x *FieldDescriptorProto) GetType() FieldDescriptorProto_Type {
+	if x != nil && x.Type != nil {
+		return *x.Type
+	}
+	return FieldDescriptorProto_TYPE_DOUBLE
+}
+
+func (x *FieldDescriptorProto) GetTypeName() string {
+	if x != nil && x.TypeName != nil {
+		return *x.TypeName
+	}
+	return ""
+}
+
+func (x *FieldDescriptorProto) GetExtendee() string {
+	if x != nil && x.Extendee != nil {
+		return *x.Extendee
+	}
+	return ""
+}
+
+func (x *FieldDescriptorProto) GetDefaultValue() string {
+	if x != nil && x.DefaultValue != nil {
+		return *x.DefaultValue
+	}
+	return ""
+}
+
+func (x *FieldDescriptorProto) GetOneofIndex() int32 {
+	if x != nil && x.OneofIndex != nil {
+		return *x.OneofIndex
+	}
+	return 0
+}
+
+func (x *FieldDescriptorProto) GetJsonName() string {
+	if x != nil && x.JsonName != nil {
+		return *x.JsonName
+	}
+	return ""
+}
+
+func (x *FieldDescriptorProto) GetOptions() *FieldOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+func (x *FieldDescriptorProto) GetProto3Optional() bool {
+	if x != nil && x.Proto3Optional != nil {
+		return *x.Proto3Optional
+	}
+	return false
+}
+
+// Describes a oneof.
+type OneofDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name    *string       `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Options *OneofOptions `protobuf:"bytes,2,opt,name=options" json:"options,omitempty"`
+}
+
+func (x *OneofDescriptorProto) Reset() {
+	*x = OneofDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OneofDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OneofDescriptorProto) ProtoMessage() {}
+
+func (x *OneofDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OneofDescriptorProto.ProtoReflect.Descriptor instead.
+func (*OneofDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *OneofDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *OneofDescriptorProto) GetOptions() *OneofOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+// Describes an enum type.
+type EnumDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name    *string                     `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Value   []*EnumValueDescriptorProto `protobuf:"bytes,2,rep,name=value" json:"value,omitempty"`
+	Options *EnumOptions                `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+	// Range of reserved numeric values. Reserved numeric values may not be used
+	// by enum values in the same enum declaration. Reserved ranges may not
+	// overlap.
+	ReservedRange []*EnumDescriptorProto_EnumReservedRange `protobuf:"bytes,4,rep,name=reserved_range,json=reservedRange" json:"reserved_range,omitempty"`
+	// Reserved enum value names, which may not be reused. A given name may only
+	// be reserved once.
+	ReservedName []string `protobuf:"bytes,5,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
+}
+
+func (x *EnumDescriptorProto) Reset() {
+	*x = EnumDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EnumDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EnumDescriptorProto) ProtoMessage() {}
+
+func (x *EnumDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EnumDescriptorProto.ProtoReflect.Descriptor instead.
+func (*EnumDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *EnumDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *EnumDescriptorProto) GetValue() []*EnumValueDescriptorProto {
+	if x != nil {
+		return x.Value
+	}
+	return nil
+}
+
+func (x *EnumDescriptorProto) GetOptions() *EnumOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+func (x *EnumDescriptorProto) GetReservedRange() []*EnumDescriptorProto_EnumReservedRange {
+	if x != nil {
+		return x.ReservedRange
+	}
+	return nil
+}
+
+func (x *EnumDescriptorProto) GetReservedName() []string {
+	if x != nil {
+		return x.ReservedName
+	}
+	return nil
+}
+
+// Describes a value within an enum.
+type EnumValueDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name    *string           `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Number  *int32            `protobuf:"varint,2,opt,name=number" json:"number,omitempty"`
+	Options *EnumValueOptions `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+}
+
+func (x *EnumValueDescriptorProto) Reset() {
+	*x = EnumValueDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EnumValueDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EnumValueDescriptorProto) ProtoMessage() {}
+
+func (x *EnumValueDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EnumValueDescriptorProto.ProtoReflect.Descriptor instead.
+func (*EnumValueDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *EnumValueDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *EnumValueDescriptorProto) GetNumber() int32 {
+	if x != nil && x.Number != nil {
+		return *x.Number
+	}
+	return 0
+}
+
+func (x *EnumValueDescriptorProto) GetOptions() *EnumValueOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+// Describes a service.
+type ServiceDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name    *string                  `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Method  []*MethodDescriptorProto `protobuf:"bytes,2,rep,name=method" json:"method,omitempty"`
+	Options *ServiceOptions          `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+}
+
+func (x *ServiceDescriptorProto) Reset() {
+	*x = ServiceDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ServiceDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ServiceDescriptorProto) ProtoMessage() {}
+
+func (x *ServiceDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[8]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ServiceDescriptorProto.ProtoReflect.Descriptor instead.
+func (*ServiceDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *ServiceDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *ServiceDescriptorProto) GetMethod() []*MethodDescriptorProto {
+	if x != nil {
+		return x.Method
+	}
+	return nil
+}
+
+func (x *ServiceDescriptorProto) GetOptions() *ServiceOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+// Describes a method of a service.
+type MethodDescriptorProto struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// Input and output type names.  These are resolved in the same way as
+	// FieldDescriptorProto.type_name, but must refer to a message type.
+	InputType  *string        `protobuf:"bytes,2,opt,name=input_type,json=inputType" json:"input_type,omitempty"`
+	OutputType *string        `protobuf:"bytes,3,opt,name=output_type,json=outputType" json:"output_type,omitempty"`
+	Options    *MethodOptions `protobuf:"bytes,4,opt,name=options" json:"options,omitempty"`
+	// Identifies if client streams multiple client messages
+	ClientStreaming *bool `protobuf:"varint,5,opt,name=client_streaming,json=clientStreaming,def=0" json:"client_streaming,omitempty"`
+	// Identifies if server streams multiple server messages
+	ServerStreaming *bool `protobuf:"varint,6,opt,name=server_streaming,json=serverStreaming,def=0" json:"server_streaming,omitempty"`
+}
+
+// Default values for MethodDescriptorProto fields.
+const (
+	Default_MethodDescriptorProto_ClientStreaming = bool(false)
+	Default_MethodDescriptorProto_ServerStreaming = bool(false)
+)
+
+func (x *MethodDescriptorProto) Reset() {
+	*x = MethodDescriptorProto{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MethodDescriptorProto) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MethodDescriptorProto) ProtoMessage() {}
+
+func (x *MethodDescriptorProto) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use MethodDescriptorProto.ProtoReflect.Descriptor instead.
+func (*MethodDescriptorProto) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *MethodDescriptorProto) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *MethodDescriptorProto) GetInputType() string {
+	if x != nil && x.InputType != nil {
+		return *x.InputType
+	}
+	return ""
+}
+
+func (x *MethodDescriptorProto) GetOutputType() string {
+	if x != nil && x.OutputType != nil {
+		return *x.OutputType
+	}
+	return ""
+}
+
+func (x *MethodDescriptorProto) GetOptions() *MethodOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+func (x *MethodDescriptorProto) GetClientStreaming() bool {
+	if x != nil && x.ClientStreaming != nil {
+		return *x.ClientStreaming
+	}
+	return Default_MethodDescriptorProto_ClientStreaming
+}
+
+func (x *MethodDescriptorProto) GetServerStreaming() bool {
+	if x != nil && x.ServerStreaming != nil {
+		return *x.ServerStreaming
+	}
+	return Default_MethodDescriptorProto_ServerStreaming
+}
+
+type FileOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Sets the Java package where classes generated from this .proto will be
+	// placed.  By default, the proto package is used, but this is often
+	// inappropriate because proto packages do not normally start with backwards
+	// domain names.
+	JavaPackage *string `protobuf:"bytes,1,opt,name=java_package,json=javaPackage" json:"java_package,omitempty"`
+	// If set, all the classes from the .proto file are wrapped in a single
+	// outer class with the given name.  This applies to both Proto1
+	// (equivalent to the old "--one_java_file" option) and Proto2 (where
+	// a .proto always translates to a single class, but you may want to
+	// explicitly choose the class name).
+	JavaOuterClassname *string `protobuf:"bytes,8,opt,name=java_outer_classname,json=javaOuterClassname" json:"java_outer_classname,omitempty"`
+	// If set true, then the Java code generator will generate a separate .java
+	// file for each top-level message, enum, and service defined in the .proto
+	// file.  Thus, these types will *not* be nested inside the outer class
+	// named by java_outer_classname.  However, the outer class will still be
+	// generated to contain the file's getDescriptor() method as well as any
+	// top-level extensions defined in the file.
+	JavaMultipleFiles *bool `protobuf:"varint,10,opt,name=java_multiple_files,json=javaMultipleFiles,def=0" json:"java_multiple_files,omitempty"`
+	// This option does nothing.
+	//
+	// Deprecated: Do not use.
+	JavaGenerateEqualsAndHash *bool `protobuf:"varint,20,opt,name=java_generate_equals_and_hash,json=javaGenerateEqualsAndHash" json:"java_generate_equals_and_hash,omitempty"`
+	// If set true, then the Java2 code generator will generate code that
+	// throws an exception whenever an attempt is made to assign a non-UTF-8
+	// byte sequence to a string field.
+	// Message reflection will do the same.
+	// However, an extension field still accepts non-UTF-8 byte sequences.
+	// This option has no effect on when used with the lite runtime.
+	JavaStringCheckUtf8 *bool                     `protobuf:"varint,27,opt,name=java_string_check_utf8,json=javaStringCheckUtf8,def=0" json:"java_string_check_utf8,omitempty"`
+	OptimizeFor         *FileOptions_OptimizeMode `protobuf:"varint,9,opt,name=optimize_for,json=optimizeFor,enum=google.protobuf.FileOptions_OptimizeMode,def=1" json:"optimize_for,omitempty"`
+	// Sets the Go package where structs generated from this .proto will be
+	// placed. If omitted, the Go package will be derived from the following:
+	//   - The basename of the package import path, if provided.
+	//   - Otherwise, the package statement in the .proto file, if present.
+	//   - Otherwise, the basename of the .proto file, without extension.
+	GoPackage *string `protobuf:"bytes,11,opt,name=go_package,json=goPackage" json:"go_package,omitempty"`
+	// Should generic services be generated in each language?  "Generic" services
+	// are not specific to any particular RPC system.  They are generated by the
+	// main code generators in each language (without additional plugins).
+	// Generic services were the only kind of service generation supported by
+	// early versions of google.protobuf.
+	//
+	// Generic services are now considered deprecated in favor of using plugins
+	// that generate code specific to your particular RPC system.  Therefore,
+	// these default to false.  Old code which depends on generic services should
+	// explicitly set them to true.
+	CcGenericServices   *bool `protobuf:"varint,16,opt,name=cc_generic_services,json=ccGenericServices,def=0" json:"cc_generic_services,omitempty"`
+	JavaGenericServices *bool `protobuf:"varint,17,opt,name=java_generic_services,json=javaGenericServices,def=0" json:"java_generic_services,omitempty"`
+	PyGenericServices   *bool `protobuf:"varint,18,opt,name=py_generic_services,json=pyGenericServices,def=0" json:"py_generic_services,omitempty"`
+	PhpGenericServices  *bool `protobuf:"varint,42,opt,name=php_generic_services,json=phpGenericServices,def=0" json:"php_generic_services,omitempty"`
+	// Is this file deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for everything in the file, or it will be completely ignored; in the very
+	// least, this is a formalization for deprecating files.
+	Deprecated *bool `protobuf:"varint,23,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// Enables the use of arenas for the proto messages in this file. This applies
+	// only to generated classes for C++.
+	CcEnableArenas *bool `protobuf:"varint,31,opt,name=cc_enable_arenas,json=ccEnableArenas,def=1" json:"cc_enable_arenas,omitempty"`
+	// Sets the objective c class prefix which is prepended to all objective c
+	// generated classes from this .proto. There is no default.
+	ObjcClassPrefix *string `protobuf:"bytes,36,opt,name=objc_class_prefix,json=objcClassPrefix" json:"objc_class_prefix,omitempty"`
+	// Namespace for generated classes; defaults to the package.
+	CsharpNamespace *string `protobuf:"bytes,37,opt,name=csharp_namespace,json=csharpNamespace" json:"csharp_namespace,omitempty"`
+	// By default Swift generators will take the proto package and CamelCase it
+	// replacing '.' with underscore and use that to prefix the types/symbols
+	// defined. When this options is provided, they will use this value instead
+	// to prefix the types/symbols defined.
+	SwiftPrefix *string `protobuf:"bytes,39,opt,name=swift_prefix,json=swiftPrefix" json:"swift_prefix,omitempty"`
+	// Sets the php class prefix which is prepended to all php generated classes
+	// from this .proto. Default is empty.
+	PhpClassPrefix *string `protobuf:"bytes,40,opt,name=php_class_prefix,json=phpClassPrefix" json:"php_class_prefix,omitempty"`
+	// Use this option to change the namespace of php generated classes. Default
+	// is empty. When this option is empty, the package name will be used for
+	// determining the namespace.
+	PhpNamespace *string `protobuf:"bytes,41,opt,name=php_namespace,json=phpNamespace" json:"php_namespace,omitempty"`
+	// Use this option to change the namespace of php generated metadata classes.
+	// Default is empty. When this option is empty, the proto file name will be
+	// used for determining the namespace.
+	PhpMetadataNamespace *string `protobuf:"bytes,44,opt,name=php_metadata_namespace,json=phpMetadataNamespace" json:"php_metadata_namespace,omitempty"`
+	// Use this option to change the package of ruby generated classes. Default
+	// is empty. When this option is not set, the package name will be used for
+	// determining the ruby package.
+	RubyPackage *string `protobuf:"bytes,45,opt,name=ruby_package,json=rubyPackage" json:"ruby_package,omitempty"`
+	// The parser stores options it doesn't recognize here.
+	// See the documentation for the "Options" section above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for FileOptions fields.
+const (
+	Default_FileOptions_JavaMultipleFiles   = bool(false)
+	Default_FileOptions_JavaStringCheckUtf8 = bool(false)
+	Default_FileOptions_OptimizeFor         = FileOptions_SPEED
+	Default_FileOptions_CcGenericServices   = bool(false)
+	Default_FileOptions_JavaGenericServices = bool(false)
+	Default_FileOptions_PyGenericServices   = bool(false)
+	Default_FileOptions_PhpGenericServices  = bool(false)
+	Default_FileOptions_Deprecated          = bool(false)
+	Default_FileOptions_CcEnableArenas      = bool(true)
+)
+
+func (x *FileOptions) Reset() {
+	*x = FileOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FileOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FileOptions) ProtoMessage() {}
+
+func (x *FileOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FileOptions.ProtoReflect.Descriptor instead.
+func (*FileOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{10}
+}
+
+var extRange_FileOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use FileOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*FileOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_FileOptions
+}
+
+func (x *FileOptions) GetJavaPackage() string {
+	if x != nil && x.JavaPackage != nil {
+		return *x.JavaPackage
+	}
+	return ""
+}
+
+func (x *FileOptions) GetJavaOuterClassname() string {
+	if x != nil && x.JavaOuterClassname != nil {
+		return *x.JavaOuterClassname
+	}
+	return ""
+}
+
+func (x *FileOptions) GetJavaMultipleFiles() bool {
+	if x != nil && x.JavaMultipleFiles != nil {
+		return *x.JavaMultipleFiles
+	}
+	return Default_FileOptions_JavaMultipleFiles
+}
+
+// Deprecated: Do not use.
+func (x *FileOptions) GetJavaGenerateEqualsAndHash() bool {
+	if x != nil && x.JavaGenerateEqualsAndHash != nil {
+		return *x.JavaGenerateEqualsAndHash
+	}
+	return false
+}
+
+func (x *FileOptions) GetJavaStringCheckUtf8() bool {
+	if x != nil && x.JavaStringCheckUtf8 != nil {
+		return *x.JavaStringCheckUtf8
+	}
+	return Default_FileOptions_JavaStringCheckUtf8
+}
+
+func (x *FileOptions) GetOptimizeFor() FileOptions_OptimizeMode {
+	if x != nil && x.OptimizeFor != nil {
+		return *x.OptimizeFor
+	}
+	return Default_FileOptions_OptimizeFor
+}
+
+func (x *FileOptions) GetGoPackage() string {
+	if x != nil && x.GoPackage != nil {
+		return *x.GoPackage
+	}
+	return ""
+}
+
+func (x *FileOptions) GetCcGenericServices() bool {
+	if x != nil && x.CcGenericServices != nil {
+		return *x.CcGenericServices
+	}
+	return Default_FileOptions_CcGenericServices
+}
+
+func (x *FileOptions) GetJavaGenericServices() bool {
+	if x != nil && x.JavaGenericServices != nil {
+		return *x.JavaGenericServices
+	}
+	return Default_FileOptions_JavaGenericServices
+}
+
+func (x *FileOptions) GetPyGenericServices() bool {
+	if x != nil && x.PyGenericServices != nil {
+		return *x.PyGenericServices
+	}
+	return Default_FileOptions_PyGenericServices
+}
+
+func (x *FileOptions) GetPhpGenericServices() bool {
+	if x != nil && x.PhpGenericServices != nil {
+		return *x.PhpGenericServices
+	}
+	return Default_FileOptions_PhpGenericServices
+}
+
+func (x *FileOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_FileOptions_Deprecated
+}
+
+func (x *FileOptions) GetCcEnableArenas() bool {
+	if x != nil && x.CcEnableArenas != nil {
+		return *x.CcEnableArenas
+	}
+	return Default_FileOptions_CcEnableArenas
+}
+
+func (x *FileOptions) GetObjcClassPrefix() string {
+	if x != nil && x.ObjcClassPrefix != nil {
+		return *x.ObjcClassPrefix
+	}
+	return ""
+}
+
+func (x *FileOptions) GetCsharpNamespace() string {
+	if x != nil && x.CsharpNamespace != nil {
+		return *x.CsharpNamespace
+	}
+	return ""
+}
+
+func (x *FileOptions) GetSwiftPrefix() string {
+	if x != nil && x.SwiftPrefix != nil {
+		return *x.SwiftPrefix
+	}
+	return ""
+}
+
+func (x *FileOptions) GetPhpClassPrefix() string {
+	if x != nil && x.PhpClassPrefix != nil {
+		return *x.PhpClassPrefix
+	}
+	return ""
+}
+
+func (x *FileOptions) GetPhpNamespace() string {
+	if x != nil && x.PhpNamespace != nil {
+		return *x.PhpNamespace
+	}
+	return ""
+}
+
+func (x *FileOptions) GetPhpMetadataNamespace() string {
+	if x != nil && x.PhpMetadataNamespace != nil {
+		return *x.PhpMetadataNamespace
+	}
+	return ""
+}
+
+func (x *FileOptions) GetRubyPackage() string {
+	if x != nil && x.RubyPackage != nil {
+		return *x.RubyPackage
+	}
+	return ""
+}
+
+func (x *FileOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type MessageOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Set true to use the old proto1 MessageSet wire format for extensions.
+	// This is provided for backwards-compatibility with the MessageSet wire
+	// format.  You should not use this for any other reason:  It's less
+	// efficient, has fewer features, and is more complicated.
+	//
+	// The message must be defined exactly as follows:
+	//   message Foo {
+	//     option message_set_wire_format = true;
+	//     extensions 4 to max;
+	//   }
+	// Note that the message cannot have any defined fields; MessageSets only
+	// have extensions.
+	//
+	// All extensions of your type must be singular messages; e.g. they cannot
+	// be int32s, enums, or repeated messages.
+	//
+	// Because this is an option, the above two restrictions are not enforced by
+	// the protocol compiler.
+	MessageSetWireFormat *bool `protobuf:"varint,1,opt,name=message_set_wire_format,json=messageSetWireFormat,def=0" json:"message_set_wire_format,omitempty"`
+	// Disables the generation of the standard "descriptor()" accessor, which can
+	// conflict with a field of the same name.  This is meant to make migration
+	// from proto1 easier; new code should avoid fields named "descriptor".
+	NoStandardDescriptorAccessor *bool `protobuf:"varint,2,opt,name=no_standard_descriptor_accessor,json=noStandardDescriptorAccessor,def=0" json:"no_standard_descriptor_accessor,omitempty"`
+	// Is this message deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for the message, or it will be completely ignored; in the very least,
+	// this is a formalization for deprecating messages.
+	Deprecated *bool `protobuf:"varint,3,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// Whether the message is an automatically generated map entry type for the
+	// maps field.
+	//
+	// For maps fields:
+	//     map<KeyType, ValueType> map_field = 1;
+	// The parsed descriptor looks like:
+	//     message MapFieldEntry {
+	//         option map_entry = true;
+	//         optional KeyType key = 1;
+	//         optional ValueType value = 2;
+	//     }
+	//     repeated MapFieldEntry map_field = 1;
+	//
+	// Implementations may choose not to generate the map_entry=true message, but
+	// use a native map in the target language to hold the keys and values.
+	// The reflection APIs in such implementations still need to work as
+	// if the field is a repeated message field.
+	//
+	// NOTE: Do not set the option in .proto files. Always use the maps syntax
+	// instead. The option should only be implicitly set by the proto compiler
+	// parser.
+	MapEntry *bool `protobuf:"varint,7,opt,name=map_entry,json=mapEntry" json:"map_entry,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for MessageOptions fields.
+const (
+	Default_MessageOptions_MessageSetWireFormat         = bool(false)
+	Default_MessageOptions_NoStandardDescriptorAccessor = bool(false)
+	Default_MessageOptions_Deprecated                   = bool(false)
+)
+
+func (x *MessageOptions) Reset() {
+	*x = MessageOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[11]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MessageOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MessageOptions) ProtoMessage() {}
+
+func (x *MessageOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[11]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use MessageOptions.ProtoReflect.Descriptor instead.
+func (*MessageOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{11}
+}
+
+var extRange_MessageOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use MessageOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*MessageOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_MessageOptions
+}
+
+func (x *MessageOptions) GetMessageSetWireFormat() bool {
+	if x != nil && x.MessageSetWireFormat != nil {
+		return *x.MessageSetWireFormat
+	}
+	return Default_MessageOptions_MessageSetWireFormat
+}
+
+func (x *MessageOptions) GetNoStandardDescriptorAccessor() bool {
+	if x != nil && x.NoStandardDescriptorAccessor != nil {
+		return *x.NoStandardDescriptorAccessor
+	}
+	return Default_MessageOptions_NoStandardDescriptorAccessor
+}
+
+func (x *MessageOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_MessageOptions_Deprecated
+}
+
+func (x *MessageOptions) GetMapEntry() bool {
+	if x != nil && x.MapEntry != nil {
+		return *x.MapEntry
+	}
+	return false
+}
+
+func (x *MessageOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type FieldOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// The ctype option instructs the C++ code generator to use a different
+	// representation of the field than it normally would.  See the specific
+	// options below.  This option is not yet implemented in the open source
+	// release -- sorry, we'll try to include it in a future version!
+	Ctype *FieldOptions_CType `protobuf:"varint,1,opt,name=ctype,enum=google.protobuf.FieldOptions_CType,def=0" json:"ctype,omitempty"`
+	// The packed option can be enabled for repeated primitive fields to enable
+	// a more efficient representation on the wire. Rather than repeatedly
+	// writing the tag and type for each element, the entire array is encoded as
+	// a single length-delimited blob. In proto3, only explicit setting it to
+	// false will avoid using packed encoding.
+	Packed *bool `protobuf:"varint,2,opt,name=packed" json:"packed,omitempty"`
+	// The jstype option determines the JavaScript type used for values of the
+	// field.  The option is permitted only for 64 bit integral and fixed types
+	// (int64, uint64, sint64, fixed64, sfixed64).  A field with jstype JS_STRING
+	// is represented as JavaScript string, which avoids loss of precision that
+	// can happen when a large value is converted to a floating point JavaScript.
+	// Specifying JS_NUMBER for the jstype causes the generated JavaScript code to
+	// use the JavaScript "number" type.  The behavior of the default option
+	// JS_NORMAL is implementation dependent.
+	//
+	// This option is an enum to permit additional types to be added, e.g.
+	// goog.math.Integer.
+	Jstype *FieldOptions_JSType `protobuf:"varint,6,opt,name=jstype,enum=google.protobuf.FieldOptions_JSType,def=0" json:"jstype,omitempty"`
+	// Should this field be parsed lazily?  Lazy applies only to message-type
+	// fields.  It means that when the outer message is initially parsed, the
+	// inner message's contents will not be parsed but instead stored in encoded
+	// form.  The inner message will actually be parsed when it is first accessed.
+	//
+	// This is only a hint.  Implementations are free to choose whether to use
+	// eager or lazy parsing regardless of the value of this option.  However,
+	// setting this option true suggests that the protocol author believes that
+	// using lazy parsing on this field is worth the additional bookkeeping
+	// overhead typically needed to implement it.
+	//
+	// This option does not affect the public interface of any generated code;
+	// all method signatures remain the same.  Furthermore, thread-safety of the
+	// interface is not affected by this option; const methods remain safe to
+	// call from multiple threads concurrently, while non-const methods continue
+	// to require exclusive access.
+	//
+	//
+	// Note that implementations may choose not to check required fields within
+	// a lazy sub-message.  That is, calling IsInitialized() on the outer message
+	// may return true even if the inner message has missing required fields.
+	// This is necessary because otherwise the inner message would have to be
+	// parsed in order to perform the check, defeating the purpose of lazy
+	// parsing.  An implementation which chooses not to check required fields
+	// must be consistent about it.  That is, for any particular sub-message, the
+	// implementation must either *always* check its required fields, or *never*
+	// check its required fields, regardless of whether or not the message has
+	// been parsed.
+	Lazy *bool `protobuf:"varint,5,opt,name=lazy,def=0" json:"lazy,omitempty"`
+	// Is this field deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for accessors, or it will be completely ignored; in the very least, this
+	// is a formalization for deprecating fields.
+	Deprecated *bool `protobuf:"varint,3,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// For Google-internal migration only. Do not use.
+	Weak *bool `protobuf:"varint,10,opt,name=weak,def=0" json:"weak,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for FieldOptions fields.
+const (
+	Default_FieldOptions_Ctype      = FieldOptions_STRING
+	Default_FieldOptions_Jstype     = FieldOptions_JS_NORMAL
+	Default_FieldOptions_Lazy       = bool(false)
+	Default_FieldOptions_Deprecated = bool(false)
+	Default_FieldOptions_Weak       = bool(false)
+)
+
+func (x *FieldOptions) Reset() {
+	*x = FieldOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[12]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FieldOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FieldOptions) ProtoMessage() {}
+
+func (x *FieldOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[12]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FieldOptions.ProtoReflect.Descriptor instead.
+func (*FieldOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{12}
+}
+
+var extRange_FieldOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use FieldOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*FieldOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_FieldOptions
+}
+
+func (x *FieldOptions) GetCtype() FieldOptions_CType {
+	if x != nil && x.Ctype != nil {
+		return *x.Ctype
+	}
+	return Default_FieldOptions_Ctype
+}
+
+func (x *FieldOptions) GetPacked() bool {
+	if x != nil && x.Packed != nil {
+		return *x.Packed
+	}
+	return false
+}
+
+func (x *FieldOptions) GetJstype() FieldOptions_JSType {
+	if x != nil && x.Jstype != nil {
+		return *x.Jstype
+	}
+	return Default_FieldOptions_Jstype
+}
+
+func (x *FieldOptions) GetLazy() bool {
+	if x != nil && x.Lazy != nil {
+		return *x.Lazy
+	}
+	return Default_FieldOptions_Lazy
+}
+
+func (x *FieldOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_FieldOptions_Deprecated
+}
+
+func (x *FieldOptions) GetWeak() bool {
+	if x != nil && x.Weak != nil {
+		return *x.Weak
+	}
+	return Default_FieldOptions_Weak
+}
+
+func (x *FieldOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type OneofOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+func (x *OneofOptions) Reset() {
+	*x = OneofOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[13]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OneofOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OneofOptions) ProtoMessage() {}
+
+func (x *OneofOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[13]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OneofOptions.ProtoReflect.Descriptor instead.
+func (*OneofOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{13}
+}
+
+var extRange_OneofOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use OneofOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*OneofOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_OneofOptions
+}
+
+func (x *OneofOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type EnumOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Set this option to true to allow mapping different tag names to the same
+	// value.
+	AllowAlias *bool `protobuf:"varint,2,opt,name=allow_alias,json=allowAlias" json:"allow_alias,omitempty"`
+	// Is this enum deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for the enum, or it will be completely ignored; in the very least, this
+	// is a formalization for deprecating enums.
+	Deprecated *bool `protobuf:"varint,3,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for EnumOptions fields.
+const (
+	Default_EnumOptions_Deprecated = bool(false)
+)
+
+func (x *EnumOptions) Reset() {
+	*x = EnumOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[14]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EnumOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EnumOptions) ProtoMessage() {}
+
+func (x *EnumOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[14]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EnumOptions.ProtoReflect.Descriptor instead.
+func (*EnumOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{14}
+}
+
+var extRange_EnumOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use EnumOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*EnumOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_EnumOptions
+}
+
+func (x *EnumOptions) GetAllowAlias() bool {
+	if x != nil && x.AllowAlias != nil {
+		return *x.AllowAlias
+	}
+	return false
+}
+
+func (x *EnumOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_EnumOptions_Deprecated
+}
+
+func (x *EnumOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type EnumValueOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Is this enum value deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for the enum value, or it will be completely ignored; in the very least,
+	// this is a formalization for deprecating enum values.
+	Deprecated *bool `protobuf:"varint,1,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for EnumValueOptions fields.
+const (
+	Default_EnumValueOptions_Deprecated = bool(false)
+)
+
+func (x *EnumValueOptions) Reset() {
+	*x = EnumValueOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[15]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EnumValueOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EnumValueOptions) ProtoMessage() {}
+
+func (x *EnumValueOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[15]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EnumValueOptions.ProtoReflect.Descriptor instead.
+func (*EnumValueOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{15}
+}
+
+var extRange_EnumValueOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use EnumValueOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*EnumValueOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_EnumValueOptions
+}
+
+func (x *EnumValueOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_EnumValueOptions_Deprecated
+}
+
+func (x *EnumValueOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type ServiceOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Is this service deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for the service, or it will be completely ignored; in the very least,
+	// this is a formalization for deprecating services.
+	Deprecated *bool `protobuf:"varint,33,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for ServiceOptions fields.
+const (
+	Default_ServiceOptions_Deprecated = bool(false)
+)
+
+func (x *ServiceOptions) Reset() {
+	*x = ServiceOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[16]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ServiceOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ServiceOptions) ProtoMessage() {}
+
+func (x *ServiceOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[16]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ServiceOptions.ProtoReflect.Descriptor instead.
+func (*ServiceOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{16}
+}
+
+var extRange_ServiceOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use ServiceOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*ServiceOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_ServiceOptions
+}
+
+func (x *ServiceOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_ServiceOptions_Deprecated
+}
+
+func (x *ServiceOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+type MethodOptions struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	// Is this method deprecated?
+	// Depending on the target platform, this can emit Deprecated annotations
+	// for the method, or it will be completely ignored; in the very least,
+	// this is a formalization for deprecating methods.
+	Deprecated       *bool                           `protobuf:"varint,33,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
+	IdempotencyLevel *MethodOptions_IdempotencyLevel `protobuf:"varint,34,opt,name=idempotency_level,json=idempotencyLevel,enum=google.protobuf.MethodOptions_IdempotencyLevel,def=0" json:"idempotency_level,omitempty"`
+	// The parser stores options it doesn't recognize here. See above.
+	UninterpretedOption []*UninterpretedOption `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+}
+
+// Default values for MethodOptions fields.
+const (
+	Default_MethodOptions_Deprecated       = bool(false)
+	Default_MethodOptions_IdempotencyLevel = MethodOptions_IDEMPOTENCY_UNKNOWN
+)
+
+func (x *MethodOptions) Reset() {
+	*x = MethodOptions{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[17]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MethodOptions) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MethodOptions) ProtoMessage() {}
+
+func (x *MethodOptions) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[17]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use MethodOptions.ProtoReflect.Descriptor instead.
+func (*MethodOptions) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{17}
+}
+
+var extRange_MethodOptions = []protoiface.ExtensionRangeV1{
+	{Start: 1000, End: 536870911},
+}
+
+// Deprecated: Use MethodOptions.ProtoReflect.Descriptor.ExtensionRanges instead.
+func (*MethodOptions) ExtensionRangeArray() []protoiface.ExtensionRangeV1 {
+	return extRange_MethodOptions
+}
+
+func (x *MethodOptions) GetDeprecated() bool {
+	if x != nil && x.Deprecated != nil {
+		return *x.Deprecated
+	}
+	return Default_MethodOptions_Deprecated
+}
+
+func (x *MethodOptions) GetIdempotencyLevel() MethodOptions_IdempotencyLevel {
+	if x != nil && x.IdempotencyLevel != nil {
+		return *x.IdempotencyLevel
+	}
+	return Default_MethodOptions_IdempotencyLevel
+}
+
+func (x *MethodOptions) GetUninterpretedOption() []*UninterpretedOption {
+	if x != nil {
+		return x.UninterpretedOption
+	}
+	return nil
+}
+
+// A message representing a option the parser does not recognize. This only
+// appears in options protos created by the compiler::Parser class.
+// DescriptorPool resolves these when building Descriptor objects. Therefore,
+// options protos in descriptor objects (e.g. returned by Descriptor::options(),
+// or produced by Descriptor::CopyTo()) will never have UninterpretedOptions
+// in them.
+type UninterpretedOption struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name []*UninterpretedOption_NamePart `protobuf:"bytes,2,rep,name=name" json:"name,omitempty"`
+	// The value of the uninterpreted option, in whatever type the tokenizer
+	// identified it as during parsing. Exactly one of these should be set.
+	IdentifierValue  *string  `protobuf:"bytes,3,opt,name=identifier_value,json=identifierValue" json:"identifier_value,omitempty"`
+	PositiveIntValue *uint64  `protobuf:"varint,4,opt,name=positive_int_value,json=positiveIntValue" json:"positive_int_value,omitempty"`
+	NegativeIntValue *int64   `protobuf:"varint,5,opt,name=negative_int_value,json=negativeIntValue" json:"negative_int_value,omitempty"`
+	DoubleValue      *float64 `protobuf:"fixed64,6,opt,name=double_value,json=doubleValue" json:"double_value,omitempty"`
+	StringValue      []byte   `protobuf:"bytes,7,opt,name=string_value,json=stringValue" json:"string_value,omitempty"`
+	AggregateValue   *string  `protobuf:"bytes,8,opt,name=aggregate_value,json=aggregateValue" json:"aggregate_value,omitempty"`
+}
+
+func (x *UninterpretedOption) Reset() {
+	*x = UninterpretedOption{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *UninterpretedOption) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UninterpretedOption) ProtoMessage() {}
+
+func (x *UninterpretedOption) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UninterpretedOption.ProtoReflect.Descriptor instead.
+func (*UninterpretedOption) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *UninterpretedOption) GetName() []*UninterpretedOption_NamePart {
+	if x != nil {
+		return x.Name
+	}
+	return nil
+}
+
+func (x *UninterpretedOption) GetIdentifierValue() string {
+	if x != nil && x.IdentifierValue != nil {
+		return *x.IdentifierValue
+	}
+	return ""
+}
+
+func (x *UninterpretedOption) GetPositiveIntValue() uint64 {
+	if x != nil && x.PositiveIntValue != nil {
+		return *x.PositiveIntValue
+	}
+	return 0
+}
+
+func (x *UninterpretedOption) GetNegativeIntValue() int64 {
+	if x != nil && x.NegativeIntValue != nil {
+		return *x.NegativeIntValue
+	}
+	return 0
+}
+
+func (x *UninterpretedOption) GetDoubleValue() float64 {
+	if x != nil && x.DoubleValue != nil {
+		return *x.DoubleValue
+	}
+	return 0
+}
+
+func (x *UninterpretedOption) GetStringValue() []byte {
+	if x != nil {
+		return x.StringValue
+	}
+	return nil
+}
+
+func (x *UninterpretedOption) GetAggregateValue() string {
+	if x != nil && x.AggregateValue != nil {
+		return *x.AggregateValue
+	}
+	return ""
+}
+
+// Encapsulates information about the original source file from which a
+// FileDescriptorProto was generated.
+type SourceCodeInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A Location identifies a piece of source code in a .proto file which
+	// corresponds to a particular definition.  This information is intended
+	// to be useful to IDEs, code indexers, documentation generators, and similar
+	// tools.
+	//
+	// For example, say we have a file like:
+	//   message Foo {
+	//     optional string foo = 1;
+	//   }
+	// Let's look at just the field definition:
+	//   optional string foo = 1;
+	//   ^       ^^     ^^  ^  ^^^
+	//   a       bc     de  f  ghi
+	// We have the following locations:
+	//   span   path               represents
+	//   [a,i)  [ 4, 0, 2, 0 ]     The whole field definition.
+	//   [a,b)  [ 4, 0, 2, 0, 4 ]  The label (optional).
+	//   [c,d)  [ 4, 0, 2, 0, 5 ]  The type (string).
+	//   [e,f)  [ 4, 0, 2, 0, 1 ]  The name (foo).
+	//   [g,h)  [ 4, 0, 2, 0, 3 ]  The number (1).
+	//
+	// Notes:
+	// - A location may refer to a repeated field itself (i.e. not to any
+	//   particular index within it).  This is used whenever a set of elements are
+	//   logically enclosed in a single code segment.  For example, an entire
+	//   extend block (possibly containing multiple extension definitions) will
+	//   have an outer location whose path refers to the "extensions" repeated
+	//   field without an index.
+	// - Multiple locations may have the same path.  This happens when a single
+	//   logical declaration is spread out across multiple places.  The most
+	//   obvious example is the "extend" block again -- there may be multiple
+	//   extend blocks in the same scope, each of which will have the same path.
+	// - A location's span is not always a subset of its parent's span.  For
+	//   example, the "extendee" of an extension declaration appears at the
+	//   beginning of the "extend" block and is shared by all extensions within
+	//   the block.
+	// - Just because a location's span is a subset of some other location's span
+	//   does not mean that it is a descendant.  For example, a "group" defines
+	//   both a type and a field in a single declaration.  Thus, the locations
+	//   corresponding to the type and field and their components will overlap.
+	// - Code which tries to interpret locations should probably be designed to
+	//   ignore those that it doesn't understand, as more types of locations could
+	//   be recorded in the future.
+	Location []*SourceCodeInfo_Location `protobuf:"bytes,1,rep,name=location" json:"location,omitempty"`
+}
+
+func (x *SourceCodeInfo) Reset() {
+	*x = SourceCodeInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[19]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SourceCodeInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SourceCodeInfo) ProtoMessage() {}
+
+func (x *SourceCodeInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[19]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SourceCodeInfo.ProtoReflect.Descriptor instead.
+func (*SourceCodeInfo) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{19}
+}
+
+func (x *SourceCodeInfo) GetLocation() []*SourceCodeInfo_Location {
+	if x != nil {
+		return x.Location
+	}
+	return nil
+}
+
+// Describes the relationship between generated code and its original source
+// file. A GeneratedCodeInfo message is associated with only one generated
+// source file, but may contain references to different source .proto files.
+type GeneratedCodeInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// An Annotation connects some span of text in generated code to an element
+	// of its generating .proto file.
+	Annotation []*GeneratedCodeInfo_Annotation `protobuf:"bytes,1,rep,name=annotation" json:"annotation,omitempty"`
+}
+
+func (x *GeneratedCodeInfo) Reset() {
+	*x = GeneratedCodeInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[20]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeneratedCodeInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeneratedCodeInfo) ProtoMessage() {}
+
+func (x *GeneratedCodeInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[20]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GeneratedCodeInfo.ProtoReflect.Descriptor instead.
+func (*GeneratedCodeInfo) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{20}
+}
+
+func (x *GeneratedCodeInfo) GetAnnotation() []*GeneratedCodeInfo_Annotation {
+	if x != nil {
+		return x.Annotation
+	}
+	return nil
+}
+
+type DescriptorProto_ExtensionRange struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Start   *int32                 `protobuf:"varint,1,opt,name=start" json:"start,omitempty"` // Inclusive.
+	End     *int32                 `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`     // Exclusive.
+	Options *ExtensionRangeOptions `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+}
+
+func (x *DescriptorProto_ExtensionRange) Reset() {
+	*x = DescriptorProto_ExtensionRange{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[21]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DescriptorProto_ExtensionRange) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DescriptorProto_ExtensionRange) ProtoMessage() {}
+
+func (x *DescriptorProto_ExtensionRange) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[21]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DescriptorProto_ExtensionRange.ProtoReflect.Descriptor instead.
+func (*DescriptorProto_ExtensionRange) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{2, 0}
+}
+
+func (x *DescriptorProto_ExtensionRange) GetStart() int32 {
+	if x != nil && x.Start != nil {
+		return *x.Start
+	}
+	return 0
+}
+
+func (x *DescriptorProto_ExtensionRange) GetEnd() int32 {
+	if x != nil && x.End != nil {
+		return *x.End
+	}
+	return 0
+}
+
+func (x *DescriptorProto_ExtensionRange) GetOptions() *ExtensionRangeOptions {
+	if x != nil {
+		return x.Options
+	}
+	return nil
+}
+
+// Range of reserved tag numbers. Reserved tag numbers may not be used by
+// fields or extension ranges in the same message. Reserved ranges may
+// not overlap.
+type DescriptorProto_ReservedRange struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Start *int32 `protobuf:"varint,1,opt,name=start" json:"start,omitempty"` // Inclusive.
+	End   *int32 `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`     // Exclusive.
+}
+
+func (x *DescriptorProto_ReservedRange) Reset() {
+	*x = DescriptorProto_ReservedRange{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[22]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DescriptorProto_ReservedRange) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DescriptorProto_ReservedRange) ProtoMessage() {}
+
+func (x *DescriptorProto_ReservedRange) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[22]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DescriptorProto_ReservedRange.ProtoReflect.Descriptor instead.
+func (*DescriptorProto_ReservedRange) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{2, 1}
+}
+
+func (x *DescriptorProto_ReservedRange) GetStart() int32 {
+	if x != nil && x.Start != nil {
+		return *x.Start
+	}
+	return 0
+}
+
+func (x *DescriptorProto_ReservedRange) GetEnd() int32 {
+	if x != nil && x.End != nil {
+		return *x.End
+	}
+	return 0
+}
+
+// Range of reserved numeric values. Reserved values may not be used by
+// entries in the same enum. Reserved ranges may not overlap.
+//
+// Note that this is distinct from DescriptorProto.ReservedRange in that it
+// is inclusive such that it can appropriately represent the entire int32
+// domain.
+type EnumDescriptorProto_EnumReservedRange struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Start *int32 `protobuf:"varint,1,opt,name=start" json:"start,omitempty"` // Inclusive.
+	End   *int32 `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`     // Inclusive.
+}
+
+func (x *EnumDescriptorProto_EnumReservedRange) Reset() {
+	*x = EnumDescriptorProto_EnumReservedRange{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[23]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EnumDescriptorProto_EnumReservedRange) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EnumDescriptorProto_EnumReservedRange) ProtoMessage() {}
+
+func (x *EnumDescriptorProto_EnumReservedRange) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[23]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EnumDescriptorProto_EnumReservedRange.ProtoReflect.Descriptor instead.
+func (*EnumDescriptorProto_EnumReservedRange) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{6, 0}
+}
+
+func (x *EnumDescriptorProto_EnumReservedRange) GetStart() int32 {
+	if x != nil && x.Start != nil {
+		return *x.Start
+	}
+	return 0
+}
+
+func (x *EnumDescriptorProto_EnumReservedRange) GetEnd() int32 {
+	if x != nil && x.End != nil {
+		return *x.End
+	}
+	return 0
+}
+
+// The name of the uninterpreted option.  Each string represents a segment in
+// a dot-separated name.  is_extension is true iff a segment represents an
+// extension (denoted with parentheses in options specs in .proto files).
+// E.g.,{ ["foo", false], ["bar.baz", true], ["qux", false] } represents
+// "foo.(bar.baz).qux".
+type UninterpretedOption_NamePart struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	NamePart    *string `protobuf:"bytes,1,req,name=name_part,json=namePart" json:"name_part,omitempty"`
+	IsExtension *bool   `protobuf:"varint,2,req,name=is_extension,json=isExtension" json:"is_extension,omitempty"`
+}
+
+func (x *UninterpretedOption_NamePart) Reset() {
+	*x = UninterpretedOption_NamePart{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *UninterpretedOption_NamePart) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UninterpretedOption_NamePart) ProtoMessage() {}
+
+func (x *UninterpretedOption_NamePart) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[24]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UninterpretedOption_NamePart.ProtoReflect.Descriptor instead.
+func (*UninterpretedOption_NamePart) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{18, 0}
+}
+
+func (x *UninterpretedOption_NamePart) GetNamePart() string {
+	if x != nil && x.NamePart != nil {
+		return *x.NamePart
+	}
+	return ""
+}
+
+func (x *UninterpretedOption_NamePart) GetIsExtension() bool {
+	if x != nil && x.IsExtension != nil {
+		return *x.IsExtension
+	}
+	return false
+}
+
+type SourceCodeInfo_Location struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Identifies which part of the FileDescriptorProto was defined at this
+	// location.
+	//
+	// Each element is a field number or an index.  They form a path from
+	// the root FileDescriptorProto to the place where the definition.  For
+	// example, this path:
+	//   [ 4, 3, 2, 7, 1 ]
+	// refers to:
+	//   file.message_type(3)  // 4, 3
+	//       .field(7)         // 2, 7
+	//       .name()           // 1
+	// This is because FileDescriptorProto.message_type has field number 4:
+	//   repeated DescriptorProto message_type = 4;
+	// and DescriptorProto.field has field number 2:
+	//   repeated FieldDescriptorProto field = 2;
+	// and FieldDescriptorProto.name has field number 1:
+	//   optional string name = 1;
+	//
+	// Thus, the above path gives the location of a field name.  If we removed
+	// the last element:
+	//   [ 4, 3, 2, 7 ]
+	// this path refers to the whole field declaration (from the beginning
+	// of the label to the terminating semicolon).
+	Path []int32 `protobuf:"varint,1,rep,packed,name=path" json:"path,omitempty"`
+	// Always has exactly three or four elements: start line, start column,
+	// end line (optional, otherwise assumed same as start line), end column.
+	// These are packed into a single field for efficiency.  Note that line
+	// and column numbers are zero-based -- typically you will want to add
+	// 1 to each before displaying to a user.
+	Span []int32 `protobuf:"varint,2,rep,packed,name=span" json:"span,omitempty"`
+	// If this SourceCodeInfo represents a complete declaration, these are any
+	// comments appearing before and after the declaration which appear to be
+	// attached to the declaration.
+	//
+	// A series of line comments appearing on consecutive lines, with no other
+	// tokens appearing on those lines, will be treated as a single comment.
+	//
+	// leading_detached_comments will keep paragraphs of comments that appear
+	// before (but not connected to) the current element. Each paragraph,
+	// separated by empty lines, will be one comment element in the repeated
+	// field.
+	//
+	// Only the comment content is provided; comment markers (e.g. //) are
+	// stripped out.  For block comments, leading whitespace and an asterisk
+	// will be stripped from the beginning of each line other than the first.
+	// Newlines are included in the output.
+	//
+	// Examples:
+	//
+	//   optional int32 foo = 1;  // Comment attached to foo.
+	//   // Comment attached to bar.
+	//   optional int32 bar = 2;
+	//
+	//   optional string baz = 3;
+	//   // Comment attached to baz.
+	//   // Another line attached to baz.
+	//
+	//   // Comment attached to qux.
+	//   //
+	//   // Another line attached to qux.
+	//   optional double qux = 4;
+	//
+	//   // Detached comment for corge. This is not leading or trailing comments
+	//   // to qux or corge because there are blank lines separating it from
+	//   // both.
+	//
+	//   // Detached comment for corge paragraph 2.
+	//
+	//   optional string corge = 5;
+	//   /* Block comment attached
+	//    * to corge.  Leading asterisks
+	//    * will be removed. */
+	//   /* Block comment attached to
+	//    * grault. */
+	//   optional int32 grault = 6;
+	//
+	//   // ignored detached comments.
+	LeadingComments         *string  `protobuf:"bytes,3,opt,name=leading_comments,json=leadingComments" json:"leading_comments,omitempty"`
+	TrailingComments        *string  `protobuf:"bytes,4,opt,name=trailing_comments,json=trailingComments" json:"trailing_comments,omitempty"`
+	LeadingDetachedComments []string `protobuf:"bytes,6,rep,name=leading_detached_comments,json=leadingDetachedComments" json:"leading_detached_comments,omitempty"`
+}
+
+func (x *SourceCodeInfo_Location) Reset() {
+	*x = SourceCodeInfo_Location{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[25]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SourceCodeInfo_Location) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SourceCodeInfo_Location) ProtoMessage() {}
+
+func (x *SourceCodeInfo_Location) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[25]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SourceCodeInfo_Location.ProtoReflect.Descriptor instead.
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+	return file_google_protobuf_descriptor_proto_rawDescGZIP(), []int{19, 0}
+}
+
+func (x *SourceCodeInfo_Location) GetPath() []int32 {
+	if x != nil {
+		return x.Path
+	}
+	return nil
+}
+
+func (x *SourceCodeInfo_Location) GetSpan() []int32 {
+	if x != nil {
+		return x.Span
+	}
+	return nil
+}
+
+func (x *SourceCodeInfo_Location) GetLeadingComments() string {
+	if x != nil && x.LeadingComments != nil {
+		return *x.LeadingComments
+	}
+	return ""
+}
+
+func (x *SourceCodeInfo_Location) GetTrailingComments() string {
+	if x != nil && x.TrailingComments != nil {
+		return *x.TrailingComments
+	}
+	return ""
+}
+
+func (x *SourceCodeInfo_Location) GetLeadingDetachedComments() []string {
+	if x != nil {
+		return x.LeadingDetachedComments
+	}
+	return nil
+}
+
+type GeneratedCodeInfo_Annotation struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Identifies the element in the original source .proto file. This field
+	// is formatted the same as SourceCodeInfo.Location.path.
+	Path []int32 `protobuf:"varint,1,rep,packed,name=path" json:"path,omitempty"`
+	// Identifies the filesystem path to the original source .proto.
+	SourceFile *string `protobuf:"bytes,2,opt,name=source_file,json=sourceFile" json:"source_file,omitempty"`
+	// Identifies the starting offset in bytes in the generated code
+	// that relates to the identified object.
+	Begin *int32 `protobuf:"varint,3,opt,name=begin" json:"begin,omitempty"`
+	// Identifies the ending offset in bytes in the generated code that
+	// relates to the identified offset. The end offset should be one past
+	// the last relevant byte (so the length of the text = end - begin).
+	End *int32 `protobuf:"varint,4,opt,name=end" json:"end,omitempty"`
+}
+
+func (x *GeneratedCodeInfo_Annotation) Reset() {
+	*x = GeneratedCodeInfo_Annotation{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_descriptor_proto_msgTypes[26]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeneratedCodeInfo_Annotation) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeneratedCodeInfo_Annotation) ProtoMessage() {}
+
+func (x *GeneratedCodeInfo_Annotation) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_descriptor_proto_msgTypes[26]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GeneratedCodeInfo_Annotation.ProtoReflect.Descriptor instead.
+func (*GeneratedCodeInfo_Annotation) Descriptor() ([]byte, []int) {
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+}
+
+func (x *GeneratedCodeInfo_Annotation) GetPath() []int32 {
+	if x != nil {
+		return x.Path
+	}
+	return nil
+}
+
+func (x *GeneratedCodeInfo_Annotation) GetSourceFile() string {
+	if x != nil && x.SourceFile != nil {
+		return *x.SourceFile
+	}
+	return ""
+}
+
+func (x *GeneratedCodeInfo_Annotation) GetBegin() int32 {
+	if x != nil && x.Begin != nil {
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+	}
+	return 0
+}
+
+func (x *GeneratedCodeInfo_Annotation) GetEnd() int32 {
+	if x != nil && x.End != nil {
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+	}
+	return 0
+}
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+var (
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+	file_google_protobuf_descriptor_proto_rawDescOnce.Do(func() {
+		file_google_protobuf_descriptor_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_descriptor_proto_rawDescData)
+	})
+	return file_google_protobuf_descriptor_proto_rawDescData
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+
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+		return
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+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EnumValueDescriptorProto); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ServiceDescriptorProto); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MethodDescriptorProto); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FileOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MessageOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FieldOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OneofOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EnumOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EnumValueOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ServiceOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MethodOptions); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*UninterpretedOption); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SourceCodeInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeneratedCodeInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DescriptorProto_ExtensionRange); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DescriptorProto_ReservedRange); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EnumDescriptorProto_EnumReservedRange); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*UninterpretedOption_NamePart); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SourceCodeInfo_Location); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_protobuf_descriptor_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeneratedCodeInfo_Annotation); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_protobuf_descriptor_proto_rawDesc,
+			NumEnums:      6,
+			NumMessages:   27,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_google_protobuf_descriptor_proto_goTypes,
+		DependencyIndexes: file_google_protobuf_descriptor_proto_depIdxs,
+		EnumInfos:         file_google_protobuf_descriptor_proto_enumTypes,
+		MessageInfos:      file_google_protobuf_descriptor_proto_msgTypes,
+	}.Build()
+	File_google_protobuf_descriptor_proto = out.File
+	file_google_protobuf_descriptor_proto_rawDesc = nil
+	file_google_protobuf_descriptor_proto_goTypes = nil
+	file_google_protobuf_descriptor_proto_depIdxs = nil
+}
diff --git a/vendor/google.golang.org/protobuf/types/known/anypb/any.pb.go b/vendor/google.golang.org/protobuf/types/known/anypb/any.pb.go
new file mode 100644
index 0000000..5f9498e
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/types/known/anypb/any.pb.go
@@ -0,0 +1,287 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/protobuf/any.proto
+
+package anypb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+// `Any` contains an arbitrary serialized protocol buffer message along with a
+// URL that describes the type of the serialized message.
+//
+// Protobuf library provides support to pack/unpack Any values in the form
+// of utility functions or additional generated methods of the Any type.
+//
+// Example 1: Pack and unpack a message in C++.
+//
+//     Foo foo = ...;
+//     Any any;
+//     any.PackFrom(foo);
+//     ...
+//     if (any.UnpackTo(&foo)) {
+//       ...
+//     }
+//
+// Example 2: Pack and unpack a message in Java.
+//
+//     Foo foo = ...;
+//     Any any = Any.pack(foo);
+//     ...
+//     if (any.is(Foo.class)) {
+//       foo = any.unpack(Foo.class);
+//     }
+//
+//  Example 3: Pack and unpack a message in Python.
+//
+//     foo = Foo(...)
+//     any = Any()
+//     any.Pack(foo)
+//     ...
+//     if any.Is(Foo.DESCRIPTOR):
+//       any.Unpack(foo)
+//       ...
+//
+//  Example 4: Pack and unpack a message in Go
+//
+//      foo := &pb.Foo{...}
+//      any, err := ptypes.MarshalAny(foo)
+//      ...
+//      foo := &pb.Foo{}
+//      if err := ptypes.UnmarshalAny(any, foo); err != nil {
+//        ...
+//      }
+//
+// The pack methods provided by protobuf library will by default use
+// 'type.googleapis.com/full.type.name' as the type URL and the unpack
+// methods only use the fully qualified type name after the last '/'
+// in the type URL, for example "foo.bar.com/x/y.z" will yield type
+// name "y.z".
+//
+//
+// JSON
+// ====
+// The JSON representation of an `Any` value uses the regular
+// representation of the deserialized, embedded message, with an
+// additional field `@type` which contains the type URL. Example:
+//
+//     package google.profile;
+//     message Person {
+//       string first_name = 1;
+//       string last_name = 2;
+//     }
+//
+//     {
+//       "@type": "type.googleapis.com/google.profile.Person",
+//       "firstName": <string>,
+//       "lastName": <string>
+//     }
+//
+// If the embedded message type is well-known and has a custom JSON
+// representation, that representation will be embedded adding a field
+// `value` which holds the custom JSON in addition to the `@type`
+// field. Example (for message [google.protobuf.Duration][]):
+//
+//     {
+//       "@type": "type.googleapis.com/google.protobuf.Duration",
+//       "value": "1.212s"
+//     }
+//
+type Any struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A URL/resource name that uniquely identifies the type of the serialized
+	// protocol buffer message. This string must contain at least
+	// one "/" character. The last segment of the URL's path must represent
+	// the fully qualified name of the type (as in
+	// `path/google.protobuf.Duration`). The name should be in a canonical form
+	// (e.g., leading "." is not accepted).
+	//
+	// In practice, teams usually precompile into the binary all types that they
+	// expect it to use in the context of Any. However, for URLs which use the
+	// scheme `http`, `https`, or no scheme, one can optionally set up a type
+	// server that maps type URLs to message definitions as follows:
+	//
+	// * If no scheme is provided, `https` is assumed.
+	// * An HTTP GET on the URL must yield a [google.protobuf.Type][]
+	//   value in binary format, or produce an error.
+	// * Applications are allowed to cache lookup results based on the
+	//   URL, or have them precompiled into a binary to avoid any
+	//   lookup. Therefore, binary compatibility needs to be preserved
+	//   on changes to types. (Use versioned type names to manage
+	//   breaking changes.)
+	//
+	// Note: this functionality is not currently available in the official
+	// protobuf release, and it is not used for type URLs beginning with
+	// type.googleapis.com.
+	//
+	// Schemes other than `http`, `https` (or the empty scheme) might be
+	// used with implementation specific semantics.
+	//
+	TypeUrl string `protobuf:"bytes,1,opt,name=type_url,json=typeUrl,proto3" json:"type_url,omitempty"`
+	// Must be a valid serialized protocol buffer of the above specified type.
+	Value []byte `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *Any) Reset() {
+	*x = Any{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_any_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Any) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Any) ProtoMessage() {}
+
+func (x *Any) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_any_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Any.ProtoReflect.Descriptor instead.
+func (*Any) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_any_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Any) GetTypeUrl() string {
+	if x != nil {
+		return x.TypeUrl
+	}
+	return ""
+}
+
+func (x *Any) GetValue() []byte {
+	if x != nil {
+		return x.Value
+	}
+	return nil
+}
+
+var File_google_protobuf_any_proto protoreflect.FileDescriptor
+
+var file_google_protobuf_any_proto_rawDesc = []byte{
+	0x0a, 0x19, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2f, 0x61, 0x6e, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0f, 0x67, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x22, 0x36, 0x0a, 0x03,
+	0x41, 0x6e, 0x79, 0x12, 0x19, 0x0a, 0x08, 0x74, 0x79, 0x70, 0x65, 0x5f, 0x75, 0x72, 0x6c, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x74, 0x79, 0x70, 0x65, 0x55, 0x72, 0x6c, 0x12, 0x14,
+	0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x05, 0x76,
+	0x61, 0x6c, 0x75, 0x65, 0x42, 0x6f, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67,
+	0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x42, 0x08, 0x41, 0x6e, 0x79,
+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e,
+	0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x62, 0x75, 0x66, 0x2f, 0x70, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2f, 0x61, 0x6e, 0x79, 0xa2, 0x02,
+	0x03, 0x47, 0x50, 0x42, 0xaa, 0x02, 0x1e, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x50, 0x72,
+	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x57, 0x65, 0x6c, 0x6c, 0x4b, 0x6e, 0x6f, 0x77, 0x6e,
+	0x54, 0x79, 0x70, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_google_protobuf_any_proto_rawDescOnce sync.Once
+	file_google_protobuf_any_proto_rawDescData = file_google_protobuf_any_proto_rawDesc
+)
+
+func file_google_protobuf_any_proto_rawDescGZIP() []byte {
+	file_google_protobuf_any_proto_rawDescOnce.Do(func() {
+		file_google_protobuf_any_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_any_proto_rawDescData)
+	})
+	return file_google_protobuf_any_proto_rawDescData
+}
+
+var file_google_protobuf_any_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_google_protobuf_any_proto_goTypes = []interface{}{
+	(*Any)(nil), // 0: google.protobuf.Any
+}
+var file_google_protobuf_any_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_google_protobuf_any_proto_init() }
+func file_google_protobuf_any_proto_init() {
+	if File_google_protobuf_any_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_google_protobuf_any_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Any); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_protobuf_any_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_google_protobuf_any_proto_goTypes,
+		DependencyIndexes: file_google_protobuf_any_proto_depIdxs,
+		MessageInfos:      file_google_protobuf_any_proto_msgTypes,
+	}.Build()
+	File_google_protobuf_any_proto = out.File
+	file_google_protobuf_any_proto_rawDesc = nil
+	file_google_protobuf_any_proto_goTypes = nil
+	file_google_protobuf_any_proto_depIdxs = nil
+}
diff --git a/vendor/google.golang.org/protobuf/types/known/durationpb/duration.pb.go b/vendor/google.golang.org/protobuf/types/known/durationpb/duration.pb.go
new file mode 100644
index 0000000..3997c60
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/types/known/durationpb/duration.pb.go
@@ -0,0 +1,249 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/protobuf/duration.proto
+
+package durationpb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+// A Duration represents a signed, fixed-length span of time represented
+// as a count of seconds and fractions of seconds at nanosecond
+// resolution. It is independent of any calendar and concepts like "day"
+// or "month". It is related to Timestamp in that the difference between
+// two Timestamp values is a Duration and it can be added or subtracted
+// from a Timestamp. Range is approximately +-10,000 years.
+//
+// # Examples
+//
+// Example 1: Compute Duration from two Timestamps in pseudo code.
+//
+//     Timestamp start = ...;
+//     Timestamp end = ...;
+//     Duration duration = ...;
+//
+//     duration.seconds = end.seconds - start.seconds;
+//     duration.nanos = end.nanos - start.nanos;
+//
+//     if (duration.seconds < 0 && duration.nanos > 0) {
+//       duration.seconds += 1;
+//       duration.nanos -= 1000000000;
+//     } else if (duration.seconds > 0 && duration.nanos < 0) {
+//       duration.seconds -= 1;
+//       duration.nanos += 1000000000;
+//     }
+//
+// Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
+//
+//     Timestamp start = ...;
+//     Duration duration = ...;
+//     Timestamp end = ...;
+//
+//     end.seconds = start.seconds + duration.seconds;
+//     end.nanos = start.nanos + duration.nanos;
+//
+//     if (end.nanos < 0) {
+//       end.seconds -= 1;
+//       end.nanos += 1000000000;
+//     } else if (end.nanos >= 1000000000) {
+//       end.seconds += 1;
+//       end.nanos -= 1000000000;
+//     }
+//
+// Example 3: Compute Duration from datetime.timedelta in Python.
+//
+//     td = datetime.timedelta(days=3, minutes=10)
+//     duration = Duration()
+//     duration.FromTimedelta(td)
+//
+// # JSON Mapping
+//
+// In JSON format, the Duration type is encoded as a string rather than an
+// object, where the string ends in the suffix "s" (indicating seconds) and
+// is preceded by the number of seconds, with nanoseconds expressed as
+// fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+// encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+// be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+// microsecond should be expressed in JSON format as "3.000001s".
+//
+//
+type Duration struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Signed seconds of the span of time. Must be from -315,576,000,000
+	// to +315,576,000,000 inclusive. Note: these bounds are computed from:
+	// 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+	Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
+	// Signed fractions of a second at nanosecond resolution of the span
+	// of time. Durations less than one second are represented with a 0
+	// `seconds` field and a positive or negative `nanos` field. For durations
+	// of one second or more, a non-zero value for the `nanos` field must be
+	// of the same sign as the `seconds` field. Must be from -999,999,999
+	// to +999,999,999 inclusive.
+	Nanos int32 `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
+}
+
+func (x *Duration) Reset() {
+	*x = Duration{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_duration_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Duration) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Duration) ProtoMessage() {}
+
+func (x *Duration) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_duration_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Duration.ProtoReflect.Descriptor instead.
+func (*Duration) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_duration_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Duration) GetSeconds() int64 {
+	if x != nil {
+		return x.Seconds
+	}
+	return 0
+}
+
+func (x *Duration) GetNanos() int32 {
+	if x != nil {
+		return x.Nanos
+	}
+	return 0
+}
+
+var File_google_protobuf_duration_proto protoreflect.FileDescriptor
+
+var file_google_protobuf_duration_proto_rawDesc = []byte{
+	0x0a, 0x1e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2f, 0x64, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x12, 0x0f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x22, 0x3a, 0x0a, 0x08, 0x44, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x18, 0x0a,
+	0x07, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x03, 0x52, 0x07,
+	0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x73, 0x12, 0x14, 0x0a, 0x05, 0x6e, 0x61, 0x6e, 0x6f, 0x73,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x05, 0x6e, 0x61, 0x6e, 0x6f, 0x73, 0x42, 0x7c, 0x0a,
+	0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x42, 0x0d, 0x44, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x50, 0x72,
+	0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x2a, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2f, 0x70, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2f, 0x64, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f,
+	0x6e, 0xf8, 0x01, 0x01, 0xa2, 0x02, 0x03, 0x47, 0x50, 0x42, 0xaa, 0x02, 0x1e, 0x47, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x57, 0x65, 0x6c,
+	0x6c, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x54, 0x79, 0x70, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
+}
+
+var (
+	file_google_protobuf_duration_proto_rawDescOnce sync.Once
+	file_google_protobuf_duration_proto_rawDescData = file_google_protobuf_duration_proto_rawDesc
+)
+
+func file_google_protobuf_duration_proto_rawDescGZIP() []byte {
+	file_google_protobuf_duration_proto_rawDescOnce.Do(func() {
+		file_google_protobuf_duration_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_duration_proto_rawDescData)
+	})
+	return file_google_protobuf_duration_proto_rawDescData
+}
+
+var file_google_protobuf_duration_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_google_protobuf_duration_proto_goTypes = []interface{}{
+	(*Duration)(nil), // 0: google.protobuf.Duration
+}
+var file_google_protobuf_duration_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_google_protobuf_duration_proto_init() }
+func file_google_protobuf_duration_proto_init() {
+	if File_google_protobuf_duration_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_google_protobuf_duration_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Duration); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_protobuf_duration_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_google_protobuf_duration_proto_goTypes,
+		DependencyIndexes: file_google_protobuf_duration_proto_depIdxs,
+		MessageInfos:      file_google_protobuf_duration_proto_msgTypes,
+	}.Build()
+	File_google_protobuf_duration_proto = out.File
+	file_google_protobuf_duration_proto_rawDesc = nil
+	file_google_protobuf_duration_proto_goTypes = nil
+	file_google_protobuf_duration_proto_depIdxs = nil
+}
diff --git a/vendor/google.golang.org/protobuf/types/known/emptypb/empty.pb.go b/vendor/google.golang.org/protobuf/types/known/emptypb/empty.pb.go
new file mode 100644
index 0000000..32a583d
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/types/known/emptypb/empty.pb.go
@@ -0,0 +1,168 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/protobuf/empty.proto
+
+package emptypb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+// A generic empty message that you can re-use to avoid defining duplicated
+// empty messages in your APIs. A typical example is to use it as the request
+// or the response type of an API method. For instance:
+//
+//     service Foo {
+//       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+//     }
+//
+// The JSON representation for `Empty` is empty JSON object `{}`.
+type Empty struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_empty_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_empty_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_empty_proto_rawDescGZIP(), []int{0}
+}
+
+var File_google_protobuf_empty_proto protoreflect.FileDescriptor
+
+var file_google_protobuf_empty_proto_rawDesc = []byte{
+	0x0a, 0x1b, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2f, 0x65, 0x6d, 0x70, 0x74, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0f, 0x67,
+	0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x22, 0x07,
+	0x0a, 0x05, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x42, 0x76, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x67,
+	0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x42, 0x0a,
+	0x45, 0x6d, 0x70, 0x74, 0x79, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x27, 0x67, 0x69,
+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x70, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2f,
+	0x65, 0x6d, 0x70, 0x74, 0x79, 0xf8, 0x01, 0x01, 0xa2, 0x02, 0x03, 0x47, 0x50, 0x42, 0xaa, 0x02,
+	0x1e, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66,
+	0x2e, 0x57, 0x65, 0x6c, 0x6c, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x54, 0x79, 0x70, 0x65, 0x73, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_google_protobuf_empty_proto_rawDescOnce sync.Once
+	file_google_protobuf_empty_proto_rawDescData = file_google_protobuf_empty_proto_rawDesc
+)
+
+func file_google_protobuf_empty_proto_rawDescGZIP() []byte {
+	file_google_protobuf_empty_proto_rawDescOnce.Do(func() {
+		file_google_protobuf_empty_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_empty_proto_rawDescData)
+	})
+	return file_google_protobuf_empty_proto_rawDescData
+}
+
+var file_google_protobuf_empty_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_google_protobuf_empty_proto_goTypes = []interface{}{
+	(*Empty)(nil), // 0: google.protobuf.Empty
+}
+var file_google_protobuf_empty_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_google_protobuf_empty_proto_init() }
+func file_google_protobuf_empty_proto_init() {
+	if File_google_protobuf_empty_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_google_protobuf_empty_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Empty); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_protobuf_empty_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_google_protobuf_empty_proto_goTypes,
+		DependencyIndexes: file_google_protobuf_empty_proto_depIdxs,
+		MessageInfos:      file_google_protobuf_empty_proto_msgTypes,
+	}.Build()
+	File_google_protobuf_empty_proto = out.File
+	file_google_protobuf_empty_proto_rawDesc = nil
+	file_google_protobuf_empty_proto_goTypes = nil
+	file_google_protobuf_empty_proto_depIdxs = nil
+}
diff --git a/vendor/google.golang.org/protobuf/types/known/timestamppb/timestamp.pb.go b/vendor/google.golang.org/protobuf/types/known/timestamppb/timestamp.pb.go
new file mode 100644
index 0000000..6fe6d42
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/types/known/timestamppb/timestamp.pb.go
@@ -0,0 +1,271 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: google/protobuf/timestamp.proto
+
+package timestamppb
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+// A Timestamp represents a point in time independent of any time zone or local
+// calendar, encoded as a count of seconds and fractions of seconds at
+// nanosecond resolution. The count is relative to an epoch at UTC midnight on
+// January 1, 1970, in the proleptic Gregorian calendar which extends the
+// Gregorian calendar backwards to year one.
+//
+// All minutes are 60 seconds long. Leap seconds are "smeared" so that no leap
+// second table is needed for interpretation, using a [24-hour linear
+// smear](https://developers.google.com/time/smear).
+//
+// The range is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. By
+// restricting to that range, we ensure that we can convert to and from [RFC
+// 3339](https://www.ietf.org/rfc/rfc3339.txt) date strings.
+//
+// # Examples
+//
+// Example 1: Compute Timestamp from POSIX `time()`.
+//
+//     Timestamp timestamp;
+//     timestamp.set_seconds(time(NULL));
+//     timestamp.set_nanos(0);
+//
+// Example 2: Compute Timestamp from POSIX `gettimeofday()`.
+//
+//     struct timeval tv;
+//     gettimeofday(&tv, NULL);
+//
+//     Timestamp timestamp;
+//     timestamp.set_seconds(tv.tv_sec);
+//     timestamp.set_nanos(tv.tv_usec * 1000);
+//
+// Example 3: Compute Timestamp from Win32 `GetSystemTimeAsFileTime()`.
+//
+//     FILETIME ft;
+//     GetSystemTimeAsFileTime(&ft);
+//     UINT64 ticks = (((UINT64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
+//
+//     // A Windows tick is 100 nanoseconds. Windows epoch 1601-01-01T00:00:00Z
+//     // is 11644473600 seconds before Unix epoch 1970-01-01T00:00:00Z.
+//     Timestamp timestamp;
+//     timestamp.set_seconds((INT64) ((ticks / 10000000) - 11644473600LL));
+//     timestamp.set_nanos((INT32) ((ticks % 10000000) * 100));
+//
+// Example 4: Compute Timestamp from Java `System.currentTimeMillis()`.
+//
+//     long millis = System.currentTimeMillis();
+//
+//     Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
+//         .setNanos((int) ((millis % 1000) * 1000000)).build();
+//
+//
+// Example 5: Compute Timestamp from current time in Python.
+//
+//     timestamp = Timestamp()
+//     timestamp.GetCurrentTime()
+//
+// # JSON Mapping
+//
+// In JSON format, the Timestamp type is encoded as a string in the
+// [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+// format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+// where {year} is always expressed using four digits while {month}, {day},
+// {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+// seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+// is required. A proto3 JSON serializer should always use UTC (as indicated by
+// "Z") when printing the Timestamp type and a proto3 JSON parser should be
+// able to accept both UTC and other timezones (as indicated by an offset).
+//
+// For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+// 01:30 UTC on January 15, 2017.
+//
+// In JavaScript, one can convert a Date object to this format using the
+// standard
+// [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString)
+// method. In Python, a standard `datetime.datetime` object can be converted
+// to this format using
+// [`strftime`](https://docs.python.org/2/library/time.html#time.strftime) with
+// the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one can use
+// the Joda Time's [`ISODateTimeFormat.dateTime()`](
+// http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime%2D%2D
+// ) to obtain a formatter capable of generating timestamps in this format.
+//
+//
+type Timestamp struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Represents seconds of UTC time since Unix epoch
+	// 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+	// 9999-12-31T23:59:59Z inclusive.
+	Seconds int64 `protobuf:"varint,1,opt,name=seconds,proto3" json:"seconds,omitempty"`
+	// Non-negative fractions of a second at nanosecond resolution. Negative
+	// second values with fractions must still have non-negative nanos values
+	// that count forward in time. Must be from 0 to 999,999,999
+	// inclusive.
+	Nanos int32 `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
+}
+
+func (x *Timestamp) Reset() {
+	*x = Timestamp{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_protobuf_timestamp_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Timestamp) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Timestamp) ProtoMessage() {}
+
+func (x *Timestamp) ProtoReflect() protoreflect.Message {
+	mi := &file_google_protobuf_timestamp_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Timestamp.ProtoReflect.Descriptor instead.
+func (*Timestamp) Descriptor() ([]byte, []int) {
+	return file_google_protobuf_timestamp_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Timestamp) GetSeconds() int64 {
+	if x != nil {
+		return x.Seconds
+	}
+	return 0
+}
+
+func (x *Timestamp) GetNanos() int32 {
+	if x != nil {
+		return x.Nanos
+	}
+	return 0
+}
+
+var File_google_protobuf_timestamp_proto protoreflect.FileDescriptor
+
+var file_google_protobuf_timestamp_proto_rawDesc = []byte{
+	0x0a, 0x1f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
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+	0x6f, 0x73, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x05, 0x6e, 0x61, 0x6e, 0x6f, 0x73, 0x42,
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+	0x6f, 0x62, 0x75, 0x66, 0x2f, 0x70, 0x74, 0x79, 0x70, 0x65, 0x73, 0x2f, 0x74, 0x69, 0x6d, 0x65,
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+	0x1e, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66,
+	0x2e, 0x57, 0x65, 0x6c, 0x6c, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x54, 0x79, 0x70, 0x65, 0x73, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_google_protobuf_timestamp_proto_rawDescOnce sync.Once
+	file_google_protobuf_timestamp_proto_rawDescData = file_google_protobuf_timestamp_proto_rawDesc
+)
+
+func file_google_protobuf_timestamp_proto_rawDescGZIP() []byte {
+	file_google_protobuf_timestamp_proto_rawDescOnce.Do(func() {
+		file_google_protobuf_timestamp_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_timestamp_proto_rawDescData)
+	})
+	return file_google_protobuf_timestamp_proto_rawDescData
+}
+
+var file_google_protobuf_timestamp_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_google_protobuf_timestamp_proto_goTypes = []interface{}{
+	(*Timestamp)(nil), // 0: google.protobuf.Timestamp
+}
+var file_google_protobuf_timestamp_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_google_protobuf_timestamp_proto_init() }
+func file_google_protobuf_timestamp_proto_init() {
+	if File_google_protobuf_timestamp_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_google_protobuf_timestamp_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Timestamp); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_protobuf_timestamp_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_google_protobuf_timestamp_proto_goTypes,
+		DependencyIndexes: file_google_protobuf_timestamp_proto_depIdxs,
+		MessageInfos:      file_google_protobuf_timestamp_proto_msgTypes,
+	}.Build()
+	File_google_protobuf_timestamp_proto = out.File
+	file_google_protobuf_timestamp_proto_rawDesc = nil
+	file_google_protobuf_timestamp_proto_goTypes = nil
+	file_google_protobuf_timestamp_proto_depIdxs = nil
+}