This update provides:
1) workaround around the build failures. In
summary, it forces the download of some packages during the build
process.
2) update the set of packages that should go inside the vendor
directory
3) Update the dockerfile to use go 1.10
Change-Id: I2bfd090ce0f25b0c10aa214755ae2da7e5384d60
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore
new file mode 100644
index 0000000..c198e6a
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.gitignore
@@ -0,0 +1,202 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Go template
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+### Windows template
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+### Kate template
+# Swap Files #
+.*.kate-swp
+.swp.*
+### SublimeText template
+# cache files for sublime text
+*.tmlanguage.cache
+*.tmPreferences.cache
+*.stTheme.cache
+
+# workspace files are user-specific
+*.sublime-workspace
+
+# project files should be checked into the repository, unless a significant
+# proportion of contributors will probably not be using SublimeText
+# *.sublime-project
+
+# sftp configuration file
+sftp-config.json
+### Linux template
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea
+.idea/tasks.xml
+.idea/dictionaries
+.idea/vcs.xml
+.idea/jsLibraryMappings.xml
+
+# Sensitive or high-churn files:
+.idea/dataSources.ids
+.idea/dataSources.xml
+.idea/dataSources.local.xml
+.idea/sqlDataSources.xml
+.idea/dynamic.xml
+.idea/uiDesigner.xml
+
+# Gradle:
+.idea/gradle.xml
+.idea/libraries
+
+# Mongo Explorer plugin:
+.idea/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+### Xcode template
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+### Eclipse template
+
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+
+# Eclipse Core
+.project
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# PyDev specific (Python IDE for Eclipse)
+*.pydevproject
+
+# CDT-specific (C/C++ Development Tooling)
+.cproject
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# Java annotation processor (APT)
+.factorypath
+
+# PDT-specific (PHP Development Tools)
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# Tern plugin
+.tern-project
+
+# TeXlipse plugin
+.texlipse
+
+# STS (Spring Tool Suite)
+.springBeans
+
+# Code Recommenders
+.recommenders/
+
+
+coverage.txt
+
+#vendor
+vendor/
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.travis.yml b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.travis.yml
new file mode 100644
index 0000000..2fc21dd
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/.travis.yml
@@ -0,0 +1,22 @@
+sudo: false
+language: go
+go:
+ - 1.8.x
+env:
+ - DEP_VERSION="0.3.2"
+
+before_install:
+ # Download the binary to bin folder in $GOPATH
+ - curl -L -s https://github.com/golang/dep/releases/download/v${DEP_VERSION}/dep-linux-amd64 -o $GOPATH/bin/dep
+ # Make the binary executable
+ - chmod +x $GOPATH/bin/dep
+
+install:
+ - dep ensure
+
+script:
+ - make checkdocs
+ - make test
+
+after_success:
+ - bash <(curl -s https://codecov.io/bash)
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/CONTRIBUTING.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/CONTRIBUTING.md
new file mode 100644
index 0000000..dd52ab8
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/CONTRIBUTING.md
@@ -0,0 +1,20 @@
+# Contributing
+
+We would love to have people submit pull requests and help make `grpc-ecosystem/go-grpc-middleware` even better 👍.
+
+Fork, then clone the repo:
+
+```bash
+git clone git@github.com:your-username/go-grpc-middleware.git
+```
+
+Before checking in please run the following:
+
+```bash
+make all
+```
+
+This will `vet`, `fmt`, regenerate documentation and run all tests.
+
+
+Push to your fork and open a pull request.
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/DOC.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/DOC.md
new file mode 100644
index 0000000..511d953
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/DOC.md
@@ -0,0 +1,166 @@
+# grpc_middleware
+`import "github.com/grpc-ecosystem/go-grpc-middleware"`
+
+* [Overview](#pkg-overview)
+* [Imported Packages](#pkg-imports)
+* [Index](#pkg-index)
+
+## <a name="pkg-overview">Overview</a>
+`grpc_middleware` is a collection of gRPC middleware packages: interceptors, helpers and tools.
+
+### Middleware
+gRPC is a fantastic RPC middleware, which sees a lot of adoption in the Golang world. However, the
+upstream gRPC codebase is relatively bare bones.
+
+This package, and most of its child packages provides commonly needed middleware for gRPC:
+client-side interceptors for retires, server-side interceptors for input validation and auth,
+functions for chaining said interceptors, metadata convenience methods and more.
+
+### Chaining
+By default, gRPC doesn't allow one to have more than one interceptor either on the client nor on
+the server side. `grpc_middleware` provides convenient chaining methods
+
+Simple way of turning a multiple interceptors into a single interceptor. Here's an example for
+server chaining:
+
+ myServer := grpc.NewServer(
+ grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(loggingStream, monitoringStream, authStream)),
+ grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(loggingUnary, monitoringUnary, authUnary),
+ )
+
+These interceptors will be executed from left to right: logging, monitoring and auth.
+
+Here's an example for client side chaining:
+
+ clientConn, err = grpc.Dial(
+ address,
+ grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(monitoringClientUnary, retryUnary)),
+ grpc.WithStreamInterceptor(grpc_middleware.ChainStreamClient(monitoringClientStream, retryStream)),
+ )
+ client = pb_testproto.NewTestServiceClient(clientConn)
+ resp, err := client.PingEmpty(s.ctx, &myservice.Request{Msg: "hello"})
+
+These interceptors will be executed from left to right: monitoring and then retry logic.
+
+The retry interceptor will call every interceptor that follows it whenever when a retry happens.
+
+### Writing Your Own
+Implementing your own interceptor is pretty trivial: there are interfaces for that. But the interesting
+bit exposing common data to handlers (and other middleware), similarly to HTTP Middleware design.
+For example, you may want to pass the identity of the caller from the auth interceptor all the way
+to the handling function.
+
+For example, a client side interceptor example for auth looks like:
+
+ func FakeAuthUnaryInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+ newCtx := context.WithValue(ctx, "user_id", "john@example.com")
+ return handler(newCtx, req)
+ }
+
+Unfortunately, it's not as easy for streaming RPCs. These have the `context.Context` embedded within
+the `grpc.ServerStream` object. To pass values through context, a wrapper (`WrappedServerStream`) is
+needed. For example:
+
+ func FakeAuthStreamingInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+ newStream := grpc_middleware.WrapServerStream(stream)
+ newStream.WrappedContext = context.WithValue(ctx, "user_id", "john@example.com")
+ return handler(srv, stream)
+ }
+
+## <a name="pkg-imports">Imported Packages</a>
+
+- [golang.org/x/net/context](https://godoc.org/golang.org/x/net/context)
+- [google.golang.org/grpc](https://godoc.org/google.golang.org/grpc)
+
+## <a name="pkg-index">Index</a>
+* [func ChainStreamClient(interceptors ...grpc.StreamClientInterceptor) grpc.StreamClientInterceptor](#ChainStreamClient)
+* [func ChainStreamServer(interceptors ...grpc.StreamServerInterceptor) grpc.StreamServerInterceptor](#ChainStreamServer)
+* [func ChainUnaryClient(interceptors ...grpc.UnaryClientInterceptor) grpc.UnaryClientInterceptor](#ChainUnaryClient)
+* [func ChainUnaryServer(interceptors ...grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor](#ChainUnaryServer)
+* [func WithStreamServerChain(interceptors ...grpc.StreamServerInterceptor) grpc.ServerOption](#WithStreamServerChain)
+* [func WithUnaryServerChain(interceptors ...grpc.UnaryServerInterceptor) grpc.ServerOption](#WithUnaryServerChain)
+* [type WrappedServerStream](#WrappedServerStream)
+ * [func WrapServerStream(stream grpc.ServerStream) \*WrappedServerStream](#WrapServerStream)
+ * [func (w \*WrappedServerStream) Context() context.Context](#WrappedServerStream.Context)
+
+#### <a name="pkg-files">Package files</a>
+[chain.go](./chain.go) [doc.go](./doc.go) [wrappers.go](./wrappers.go)
+
+## <a name="ChainStreamClient">func</a> [ChainStreamClient](./chain.go#L136)
+``` go
+func ChainStreamClient(interceptors ...grpc.StreamClientInterceptor) grpc.StreamClientInterceptor
+```
+ChainStreamClient creates a single interceptor out of a chain of many interceptors.
+
+Execution is done in left-to-right order, including passing of context.
+For example ChainStreamClient(one, two, three) will execute one before two before three.
+
+## <a name="ChainStreamServer">func</a> [ChainStreamServer](./chain.go#L58)
+``` go
+func ChainStreamServer(interceptors ...grpc.StreamServerInterceptor) grpc.StreamServerInterceptor
+```
+ChainStreamServer creates a single interceptor out of a chain of many interceptors.
+
+Execution is done in left-to-right order, including passing of context.
+For example ChainUnaryServer(one, two, three) will execute one before two before three.
+If you want to pass context between interceptors, use WrapServerStream.
+
+## <a name="ChainUnaryClient">func</a> [ChainUnaryClient](./chain.go#L97)
+``` go
+func ChainUnaryClient(interceptors ...grpc.UnaryClientInterceptor) grpc.UnaryClientInterceptor
+```
+ChainUnaryClient creates a single interceptor out of a chain of many interceptors.
+
+Execution is done in left-to-right order, including passing of context.
+For example ChainUnaryClient(one, two, three) will execute one before two before three.
+
+## <a name="ChainUnaryServer">func</a> [ChainUnaryServer](./chain.go#L18)
+``` go
+func ChainUnaryServer(interceptors ...grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor
+```
+ChainUnaryServer creates a single interceptor out of a chain of many interceptors.
+
+Execution is done in left-to-right order, including passing of context.
+For example ChainUnaryServer(one, two, three) will execute one before two before three, and three
+will see context changes of one and two.
+
+## <a name="WithStreamServerChain">func</a> [WithStreamServerChain](./chain.go#L181)
+``` go
+func WithStreamServerChain(interceptors ...grpc.StreamServerInterceptor) grpc.ServerOption
+```
+WithStreamServerChain is a grpc.Server config option that accepts multiple stream interceptors.
+Basically syntactic sugar.
+
+## <a name="WithUnaryServerChain">func</a> [WithUnaryServerChain](./chain.go#L175)
+``` go
+func WithUnaryServerChain(interceptors ...grpc.UnaryServerInterceptor) grpc.ServerOption
+```
+Chain creates a single interceptor out of a chain of many interceptors.
+
+WithUnaryServerChain is a grpc.Server config option that accepts multiple unary interceptors.
+Basically syntactic sugar.
+
+## <a name="WrappedServerStream">type</a> [WrappedServerStream](./wrappers.go#L12-L16)
+``` go
+type WrappedServerStream struct {
+ grpc.ServerStream
+ // WrappedContext is the wrapper's own Context. You can assign it.
+ WrappedContext context.Context
+}
+```
+WrappedServerStream is a thin wrapper around grpc.ServerStream that allows modifying context.
+
+### <a name="WrapServerStream">func</a> [WrapServerStream](./wrappers.go#L24)
+``` go
+func WrapServerStream(stream grpc.ServerStream) *WrappedServerStream
+```
+WrapServerStream returns a ServerStream that has the ability to overwrite context.
+
+### <a name="WrappedServerStream.Context">func</a> (\*WrappedServerStream) [Context](./wrappers.go#L19)
+``` go
+func (w *WrappedServerStream) Context() context.Context
+```
+Context returns the wrapper's WrappedContext, overwriting the nested grpc.ServerStream.Context()
+
+- - -
+Generated by [godoc2ghmd](https://github.com/GandalfUK/godoc2ghmd)
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.lock b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.lock
new file mode 100644
index 0000000..ebdcb75
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.lock
@@ -0,0 +1,123 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+ name = "cloud.google.com/go"
+ packages = ["compute/metadata"]
+ revision = "2d3a6656c17a60b0815b7e06ab0be04eacb6e613"
+ version = "v0.16.0"
+
+[[projects]]
+ name = "github.com/davecgh/go-spew"
+ packages = ["spew"]
+ revision = "346938d642f2ec3594ed81d874461961cd0faa76"
+ version = "v1.1.0"
+
+[[projects]]
+ name = "github.com/gogo/protobuf"
+ packages = ["gogoproto","proto","protoc-gen-gogo/descriptor"]
+ revision = "342cbe0a04158f6dcb03ca0079991a51a4248c02"
+ version = "v0.5"
+
+[[projects]]
+ branch = "master"
+ name = "github.com/golang/protobuf"
+ packages = ["jsonpb","proto","ptypes","ptypes/any","ptypes/duration","ptypes/struct","ptypes/timestamp"]
+ revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
+
+[[projects]]
+ name = "github.com/opentracing/opentracing-go"
+ packages = [".","ext","log","mocktracer"]
+ revision = "1949ddbfd147afd4d964a9f00b24eb291e0e7c38"
+ version = "v1.0.2"
+
+[[projects]]
+ name = "github.com/pmezard/go-difflib"
+ packages = ["difflib"]
+ revision = "792786c7400a136282c1664665ae0a8db921c6c2"
+ version = "v1.0.0"
+
+[[projects]]
+ name = "github.com/sirupsen/logrus"
+ packages = ["."]
+ revision = "f006c2ac4710855cf0f916dd6b77acf6b048dc6e"
+ version = "v1.0.3"
+
+[[projects]]
+ name = "github.com/stretchr/testify"
+ packages = ["assert","require","suite"]
+ revision = "69483b4bd14f5845b5a1e55bca19e954e827f1d0"
+ version = "v1.1.4"
+
+[[projects]]
+ name = "go.uber.org/atomic"
+ packages = ["."]
+ revision = "8474b86a5a6f79c443ce4b2992817ff32cf208b8"
+ version = "v1.3.1"
+
+[[projects]]
+ name = "go.uber.org/multierr"
+ packages = ["."]
+ revision = "3c4937480c32f4c13a875a1829af76c98ca3d40a"
+ version = "v1.1.0"
+
+[[projects]]
+ name = "go.uber.org/zap"
+ packages = [".","buffer","internal/bufferpool","internal/color","internal/exit","zapcore"]
+ revision = "35aad584952c3e7020db7b839f6b102de6271f89"
+ version = "v1.7.1"
+
+[[projects]]
+ branch = "master"
+ name = "golang.org/x/crypto"
+ packages = ["ssh/terminal"]
+ revision = "94eea52f7b742c7cbe0b03b22f0c4c8631ece122"
+
+[[projects]]
+ branch = "master"
+ name = "golang.org/x/net"
+ packages = ["context","context/ctxhttp","http2","http2/hpack","idna","internal/timeseries","lex/httplex","trace"]
+ revision = "a8b9294777976932365dabb6640cf1468d95c70f"
+
+[[projects]]
+ branch = "master"
+ name = "golang.org/x/oauth2"
+ packages = [".","google","internal","jws","jwt"]
+ revision = "f95fa95eaa936d9d87489b15d1d18b97c1ba9c28"
+
+[[projects]]
+ branch = "master"
+ name = "golang.org/x/sys"
+ packages = ["unix","windows"]
+ revision = "13fcbd661c8ececa8807a29b48407d674b1d8ed8"
+
+[[projects]]
+ branch = "master"
+ name = "golang.org/x/text"
+ packages = ["collate","collate/build","internal/colltab","internal/gen","internal/tag","internal/triegen","internal/ucd","language","secure/bidirule","transform","unicode/bidi","unicode/cldr","unicode/norm","unicode/rangetable"]
+ revision = "75cc3cad82b5f47d3fb229ddda8c5167da14f294"
+
+[[projects]]
+ name = "google.golang.org/appengine"
+ packages = [".","internal","internal/app_identity","internal/base","internal/datastore","internal/log","internal/modules","internal/remote_api","internal/urlfetch","urlfetch"]
+ revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a"
+ version = "v1.0.0"
+
+[[projects]]
+ branch = "master"
+ name = "google.golang.org/genproto"
+ packages = ["googleapis/rpc/status"]
+ revision = "7f0da29060c682909f650ad8ed4e515bd74fa12a"
+
+[[projects]]
+ name = "google.golang.org/grpc"
+ packages = [".","balancer","balancer/roundrobin","codes","connectivity","credentials","credentials/oauth","encoding","grpclb/grpc_lb_v1/messages","grpclog","internal","keepalive","metadata","naming","peer","resolver","resolver/dns","resolver/passthrough","stats","status","tap","transport"]
+ revision = "5a9f7b402fe85096d2e1d0383435ee1876e863d0"
+ version = "v1.8.0"
+
+[solve-meta]
+ analyzer-name = "dep"
+ analyzer-version = 1
+ inputs-digest = "b24c6670412eb0bc44ed1db77fecc52333f8725f3e3272bdc568f5683a63031f"
+ solver-name = "gps-cdcl"
+ solver-version = 1
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.toml b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.toml
new file mode 100644
index 0000000..0a7d4c1
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/Gopkg.toml
@@ -0,0 +1,35 @@
+[[constraint]]
+ name = "github.com/gogo/protobuf"
+ version = "0.5.0"
+
+[[constraint]]
+ branch = "master"
+ name = "github.com/golang/protobuf"
+
+[[constraint]]
+ name = "github.com/opentracing/opentracing-go"
+ version = "1.0.2"
+
+[[constraint]]
+ name = "github.com/sirupsen/logrus"
+ version = "1.0.3"
+
+[[constraint]]
+ name = "github.com/stretchr/testify"
+ version = "1.1.4"
+
+[[constraint]]
+ name = "go.uber.org/zap"
+ version = "1.7.1"
+
+[[constraint]]
+ branch = "master"
+ name = "golang.org/x/net"
+
+[[constraint]]
+ branch = "master"
+ name = "golang.org/x/oauth2"
+
+[[constraint]]
+ name = "google.golang.org/grpc"
+ version = "1.8.0"
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/LICENSE b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/LICENSE
new file mode 100644
index 0000000..b2b0650
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/LICENSE
@@ -0,0 +1,201 @@
+ 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.
+
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+ meet the following conditions:
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+
+ (b) You must cause any modified files to carry prominent notices
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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
+ names, trademarks, service marks, or product names of the Licensor,
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+
+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
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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
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+ 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
+ License. However, in accepting such obligations, You may act only
+ 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
+ the brackets!) The text should be enclosed in the appropriate
+ comment syntax for the file format. We also recommend that a
+ file or class name and description of purpose be included on the
+ same "printed page" as the copyright notice for easier
+ identification within third-party archives.
+
+ 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
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+ 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.
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/README.md
new file mode 100644
index 0000000..52e5373
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/README.md
@@ -0,0 +1,86 @@
+# Go gRPC Middleware
+
+[](https://travis-ci.org/grpc-ecosystem/go-grpc-middleware)
+[](https://goreportcard.com/report/github.com/grpc-ecosystem/go-grpc-middleware)
+[](https://godoc.org/github.com/grpc-ecosystem/go-grpc-middleware)
+[](https://sourcegraph.com/github.com/grpc-ecosystem/go-grpc-middleware/?badge)
+[](https://codecov.io/gh/grpc-ecosystem/go-grpc-middleware)
+[](LICENSE)
+[](#status)
+[](https://join.slack.com/t/improbable-eng/shared_invite/enQtMzQ1ODcyMzQ5MjM4LWY5ZWZmNGM2ODc5MmViNmQ3ZTA3ZTY3NzQwOTBlMTkzZmIxZTIxODk0OWU3YjZhNWVlNDU3MDlkZGViZjhkMjc)
+
+[gRPC Go](https://github.com/grpc/grpc-go) Middleware: interceptors, helpers, utilities.
+
+**Important** The repo recently moved to `github.com/grpc-ecosystem/go-grpc-middleware`, please update your import paths.
+
+## Middleware
+
+[gRPC Go](https://github.com/grpc/grpc-go) recently acquired support for
+Interceptors, i.e. [middleware](https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81#.gv7tdlghs)
+that is executed either on the gRPC Server before the request is passed onto the user's application logic, or on the gRPC client either around the user call. It is a perfect way to implement
+common patterns: auth, logging, message, validation, retries or monitoring.
+
+These are generic building blocks that make it easy to build multiple microservices easily.
+The purpose of this repository is to act as a go-to point for such reusable functionality. It contains
+some of them itself, but also will link to useful external repos.
+
+`grpc_middleware` itself provides support for chaining interceptors. See [Documentation](DOC.md), but here's an example:
+
+```go
+import "github.com/grpc-ecosystem/go-grpc-middleware"
+
+myServer := grpc.NewServer(
+ grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(
+ grpc_ctxtags.StreamServerInterceptor(),
+ grpc_opentracing.StreamServerInterceptor(),
+ grpc_prometheus.StreamServerInterceptor,
+ grpc_zap.StreamServerInterceptor(zapLogger),
+ grpc_auth.StreamServerInterceptor(myAuthFunction),
+ grpc_recovery.StreamServerInterceptor(),
+ )),
+ grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(
+ grpc_ctxtags.UnaryServerInterceptor(),
+ grpc_opentracing.UnaryServerInterceptor(),
+ grpc_prometheus.UnaryServerInterceptor,
+ grpc_zap.UnaryServerInterceptor(zapLogger),
+ grpc_auth.UnaryServerInterceptor(myAuthFunction),
+ grpc_recovery.UnaryServerInterceptor(),
+ )),
+)
+```
+
+## Interceptors
+
+*Please send a PR to add new interceptors or middleware to this list*
+
+#### Auth
+ * [`grpc_auth`](auth) - a customizable (via `AuthFunc`) piece of auth middleware
+
+#### Logging
+ * [`grpc_ctxtags`](tags/) - a library that adds a `Tag` map to context, with data populated from request body
+ * [`grpc_zap`](logging/zap/) - integration of [zap](https://github.com/uber-go/zap) logging library into gRPC handlers.
+ * [`grpc_logrus`](logging/logrus/) - integration of [logrus](https://github.com/sirupsen/logrus) logging library into gRPC handlers.
+
+
+#### Monitoring
+ * [`grpc_prometheus`⚡](https://github.com/grpc-ecosystem/go-grpc-prometheus) - Prometheus client-side and server-side monitoring middleware
+ * [`otgrpc`⚡](https://github.com/grpc-ecosystem/grpc-opentracing/tree/master/go/otgrpc) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors
+ * [`grpc_opentracing`](tracing/opentracing) - [OpenTracing](http://opentracing.io/) client-side and server-side interceptors with support for streaming and handler-returned tags
+
+#### Client
+ * [`grpc_retry`](retry/) - a generic gRPC response code retry mechanism, client-side middleware
+
+#### Server
+ * [`grpc_validator`](validator/) - codegen inbound message validation from `.proto` options
+ * [`grpc_recovery`](recovery/) - turn panics into gRPC errors
+
+
+## Status
+
+This code has been running in *production* since May 2016 as the basis of the gRPC micro services stack at [Improbable](https://improbable.io).
+
+Additional tooling will be added, and contributions are welcome.
+
+## License
+
+`go-grpc-middleware` is released under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/auth/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/auth/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/auth/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/chain.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/chain.go
new file mode 100644
index 0000000..45a2f5f
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/chain.go
@@ -0,0 +1,183 @@
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+// gRPC Server Interceptor chaining middleware.
+
+package grpc_middleware
+
+import (
+ "golang.org/x/net/context"
+ "google.golang.org/grpc"
+)
+
+// ChainUnaryServer creates a single interceptor out of a chain of many interceptors.
+//
+// Execution is done in left-to-right order, including passing of context.
+// For example ChainUnaryServer(one, two, three) will execute one before two before three, and three
+// will see context changes of one and two.
+func ChainUnaryServer(interceptors ...grpc.UnaryServerInterceptor) grpc.UnaryServerInterceptor {
+ n := len(interceptors)
+
+ if n > 1 {
+ lastI := n - 1
+ return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+ var (
+ chainHandler grpc.UnaryHandler
+ curI int
+ )
+
+ chainHandler = func(currentCtx context.Context, currentReq interface{}) (interface{}, error) {
+ if curI == lastI {
+ return handler(currentCtx, currentReq)
+ }
+ curI++
+ resp, err := interceptors[curI](currentCtx, currentReq, info, chainHandler)
+ curI--
+ return resp, err
+ }
+
+ return interceptors[0](ctx, req, info, chainHandler)
+ }
+ }
+
+ if n == 1 {
+ return interceptors[0]
+ }
+
+ // n == 0; Dummy interceptor maintained for backward compatibility to avoid returning nil.
+ return func(ctx context.Context, req interface{}, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+ return handler(ctx, req)
+ }
+}
+
+// ChainStreamServer creates a single interceptor out of a chain of many interceptors.
+//
+// Execution is done in left-to-right order, including passing of context.
+// For example ChainUnaryServer(one, two, three) will execute one before two before three.
+// If you want to pass context between interceptors, use WrapServerStream.
+func ChainStreamServer(interceptors ...grpc.StreamServerInterceptor) grpc.StreamServerInterceptor {
+ n := len(interceptors)
+
+ if n > 1 {
+ lastI := n - 1
+ return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+ var (
+ chainHandler grpc.StreamHandler
+ curI int
+ )
+
+ chainHandler = func(currentSrv interface{}, currentStream grpc.ServerStream) error {
+ if curI == lastI {
+ return handler(currentSrv, currentStream)
+ }
+ curI++
+ err := interceptors[curI](currentSrv, currentStream, info, chainHandler)
+ curI--
+ return err
+ }
+
+ return interceptors[0](srv, stream, info, chainHandler)
+ }
+ }
+
+ if n == 1 {
+ return interceptors[0]
+ }
+
+ // n == 0; Dummy interceptor maintained for backward compatibility to avoid returning nil.
+ return func(srv interface{}, stream grpc.ServerStream, _ *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+ return handler(srv, stream)
+ }
+}
+
+// ChainUnaryClient creates a single interceptor out of a chain of many interceptors.
+//
+// Execution is done in left-to-right order, including passing of context.
+// For example ChainUnaryClient(one, two, three) will execute one before two before three.
+func ChainUnaryClient(interceptors ...grpc.UnaryClientInterceptor) grpc.UnaryClientInterceptor {
+ n := len(interceptors)
+
+ if n > 1 {
+ lastI := n - 1
+ return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+ var (
+ chainHandler grpc.UnaryInvoker
+ curI int
+ )
+
+ chainHandler = func(currentCtx context.Context, currentMethod string, currentReq, currentRepl interface{}, currentConn *grpc.ClientConn, currentOpts ...grpc.CallOption) error {
+ if curI == lastI {
+ return invoker(currentCtx, currentMethod, currentReq, currentRepl, currentConn, currentOpts...)
+ }
+ curI++
+ err := interceptors[curI](currentCtx, currentMethod, currentReq, currentRepl, currentConn, chainHandler, currentOpts...)
+ curI--
+ return err
+ }
+
+ return interceptors[0](ctx, method, req, reply, cc, chainHandler, opts...)
+ }
+ }
+
+ if n == 1 {
+ return interceptors[0]
+ }
+
+ // n == 0; Dummy interceptor maintained for backward compatibility to avoid returning nil.
+ return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+ return invoker(ctx, method, req, reply, cc, opts...)
+ }
+}
+
+// ChainStreamClient creates a single interceptor out of a chain of many interceptors.
+//
+// Execution is done in left-to-right order, including passing of context.
+// For example ChainStreamClient(one, two, three) will execute one before two before three.
+func ChainStreamClient(interceptors ...grpc.StreamClientInterceptor) grpc.StreamClientInterceptor {
+ n := len(interceptors)
+
+ if n > 1 {
+ lastI := n - 1
+ return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+ var (
+ chainHandler grpc.Streamer
+ curI int
+ )
+
+ chainHandler = func(currentCtx context.Context, currentDesc *grpc.StreamDesc, currentConn *grpc.ClientConn, currentMethod string, currentOpts ...grpc.CallOption) (grpc.ClientStream, error) {
+ if curI == lastI {
+ return streamer(currentCtx, currentDesc, currentConn, currentMethod, currentOpts...)
+ }
+ curI++
+ stream, err := interceptors[curI](currentCtx, currentDesc, currentConn, currentMethod, chainHandler, currentOpts...)
+ curI--
+ return stream, err
+ }
+
+ return interceptors[0](ctx, desc, cc, method, chainHandler, opts...)
+ }
+ }
+
+ if n == 1 {
+ return interceptors[0]
+ }
+
+ // n == 0; Dummy interceptor maintained for backward compatibility to avoid returning nil.
+ return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+ return streamer(ctx, desc, cc, method, opts...)
+ }
+}
+
+// Chain creates a single interceptor out of a chain of many interceptors.
+//
+// WithUnaryServerChain is a grpc.Server config option that accepts multiple unary interceptors.
+// Basically syntactic sugar.
+func WithUnaryServerChain(interceptors ...grpc.UnaryServerInterceptor) grpc.ServerOption {
+ return grpc.UnaryInterceptor(ChainUnaryServer(interceptors...))
+}
+
+// WithStreamServerChain is a grpc.Server config option that accepts multiple stream interceptors.
+// Basically syntactic sugar.
+func WithStreamServerChain(interceptors ...grpc.StreamServerInterceptor) grpc.ServerOption {
+ return grpc.StreamInterceptor(ChainStreamServer(interceptors...))
+}
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/doc.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/doc.go
new file mode 100644
index 0000000..7168950
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/doc.go
@@ -0,0 +1,69 @@
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+/*
+`grpc_middleware` is a collection of gRPC middleware packages: interceptors, helpers and tools.
+
+Middleware
+
+gRPC is a fantastic RPC middleware, which sees a lot of adoption in the Golang world. However, the
+upstream gRPC codebase is relatively bare bones.
+
+This package, and most of its child packages provides commonly needed middleware for gRPC:
+client-side interceptors for retires, server-side interceptors for input validation and auth,
+functions for chaining said interceptors, metadata convenience methods and more.
+
+Chaining
+
+By default, gRPC doesn't allow one to have more than one interceptor either on the client nor on
+the server side. `grpc_middleware` provides convenient chaining methods
+
+Simple way of turning a multiple interceptors into a single interceptor. Here's an example for
+server chaining:
+
+ myServer := grpc.NewServer(
+ grpc.StreamInterceptor(grpc_middleware.ChainStreamServer(loggingStream, monitoringStream, authStream)),
+ grpc.UnaryInterceptor(grpc_middleware.ChainUnaryServer(loggingUnary, monitoringUnary, authUnary),
+ )
+
+These interceptors will be executed from left to right: logging, monitoring and auth.
+
+Here's an example for client side chaining:
+
+ clientConn, err = grpc.Dial(
+ address,
+ grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(monitoringClientUnary, retryUnary)),
+ grpc.WithStreamInterceptor(grpc_middleware.ChainStreamClient(monitoringClientStream, retryStream)),
+ )
+ client = pb_testproto.NewTestServiceClient(clientConn)
+ resp, err := client.PingEmpty(s.ctx, &myservice.Request{Msg: "hello"})
+
+These interceptors will be executed from left to right: monitoring and then retry logic.
+
+The retry interceptor will call every interceptor that follows it whenever when a retry happens.
+
+Writing Your Own
+
+Implementing your own interceptor is pretty trivial: there are interfaces for that. But the interesting
+bit exposing common data to handlers (and other middleware), similarly to HTTP Middleware design.
+For example, you may want to pass the identity of the caller from the auth interceptor all the way
+to the handling function.
+
+For example, a client side interceptor example for auth looks like:
+
+ func FakeAuthUnaryInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+ newCtx := context.WithValue(ctx, "user_id", "john@example.com")
+ return handler(newCtx, req)
+ }
+
+Unfortunately, it's not as easy for streaming RPCs. These have the `context.Context` embedded within
+the `grpc.ServerStream` object. To pass values through context, a wrapper (`WrappedServerStream`) is
+needed. For example:
+
+ func FakeAuthStreamingInterceptor(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+ newStream := grpc_middleware.WrapServerStream(stream)
+ newStream.WrappedContext = context.WithValue(ctx, "user_id", "john@example.com")
+ return handler(srv, stream)
+ }
+*/
+package grpc_middleware
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/zap/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/zap/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/logging/zap/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/makefile b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/makefile
new file mode 100644
index 0000000..3e0f296
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/makefile
@@ -0,0 +1,22 @@
+SHELL="/bin/bash"
+
+GOFILES_NOVENDOR = $(shell go list ./... | grep -v /vendor/)
+
+all: vet fmt docs test
+
+docs:
+ ./scripts/docs.sh generate
+
+checkdocs:
+ ./scripts/docs.sh check
+
+fmt:
+ go fmt $(GOFILES_NOVENDOR)
+
+vet:
+ go vet $(GOFILES_NOVENDOR)
+
+test: vet
+ ./scripts/test_all.sh
+
+.PHONY: all docs validate test
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/recovery/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/recovery/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/recovery/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/retry/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/slack.png b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/slack.png
new file mode 100644
index 0000000..cc8f9a6
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/slack.png
Binary files differ
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tags/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/README.md
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--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/util/metautils/README.md b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/util/metautils/README.md
new file mode 120000
index 0000000..71bfc07
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/util/metautils/README.md
@@ -0,0 +1 @@
+DOC.md
\ No newline at end of file
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/wrappers.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/wrappers.go
new file mode 100644
index 0000000..597b862
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/wrappers.go
@@ -0,0 +1,29 @@
+// Copyright 2016 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+package grpc_middleware
+
+import (
+ "golang.org/x/net/context"
+ "google.golang.org/grpc"
+)
+
+// WrappedServerStream is a thin wrapper around grpc.ServerStream that allows modifying context.
+type WrappedServerStream struct {
+ grpc.ServerStream
+ // WrappedContext is the wrapper's own Context. You can assign it.
+ WrappedContext context.Context
+}
+
+// Context returns the wrapper's WrappedContext, overwriting the nested grpc.ServerStream.Context()
+func (w *WrappedServerStream) Context() context.Context {
+ return w.WrappedContext
+}
+
+// WrapServerStream returns a ServerStream that has the ability to overwrite context.
+func WrapServerStream(stream grpc.ServerStream) *WrappedServerStream {
+ if existing, ok := stream.(*WrappedServerStream); ok {
+ return existing
+ }
+ return &WrappedServerStream{ServerStream: stream, WrappedContext: stream.Context()}
+}
