initial add - go fmt on grpc
Change-Id: Ib0afadd2fe5571d1456a091f94f5644458f7d3f4
diff --git a/vendor/google.golang.org/grpc/.travis.yml b/vendor/google.golang.org/grpc/.travis.yml
new file mode 100644
index 0000000..024408e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/.travis.yml
@@ -0,0 +1,39 @@
+language: go
+
+matrix:
+ include:
+ - go: 1.12.x
+ env: VET=1 GO111MODULE=on
+ - go: 1.12.x
+ env: RACE=1 GO111MODULE=on
+ - go: 1.12.x
+ env: RUN386=1
+ - go: 1.12.x
+ env: GRPC_GO_RETRY=on
+ - go: 1.11.x
+ env: GO111MODULE=on
+ - go: 1.10.x
+ - go: 1.9.x
+ - 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 [[ "${TRAVIS_EVENT_TYPE}" != "cron" ]]; then VET_SKIP_PROTO=1; fi
+
+install:
+ - try3() { eval "$*" || eval "$*" || eval "$*"; }
+ - try3 'if [[ "${GO111MODULE}" = "on" ]]; then go mod download; else make testdeps; fi'
+ - if [[ "${GAE}" = 1 ]]; then source ./install_gae.sh; make testappenginedeps; fi
+ - if [[ "${VET}" = 1 ]]; then ./vet.sh -install; fi
+
+script:
+ - set -e
+ - if [[ "${VET}" = 1 ]]; then ./vet.sh; fi
+ - if [[ "${GAE}" = 1 ]]; then make testappengine; exit 0; fi
+ - if [[ "${RACE}" = 1 ]]; 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/CONTRIBUTING.md b/vendor/google.golang.org/grpc/CONTRIBUTING.md
new file mode 100644
index 0000000..6e69b28
--- /dev/null
+++ b/vendor/google.golang.org/grpc/CONTRIBUTING.md
@@ -0,0 +1,60 @@
+# How to contribute
+
+We definitely welcome your patches and contributions to gRPC!
+
+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/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
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
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+ 7. Disclaimer of Warranty. Unless required by applicable law or
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+ incurred by, or claims asserted against, such Contributor by reason
+ of your accepting any such warranty or additional liability.
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+ To apply the Apache License to your work, attach the following
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+ Copyright [yyyy] [name of copyright owner]
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+ 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/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
+
+[](https://travis-ci.org/grpc/grpc-go)
+[](https://godoc.org/google.golang.org/grpc)
+[](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/backoff.go b/vendor/google.golang.org/grpc/backoff.go
new file mode 100644
index 0000000..97c6e25
--- /dev/null
+++ b/vendor/google.golang.org/grpc/backoff.go
@@ -0,0 +1,38 @@
+/*
+ *
+ * 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"
+)
+
+// DefaultBackoffConfig uses values specified for backoff in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+var DefaultBackoffConfig = BackoffConfig{
+ MaxDelay: 120 * time.Second,
+}
+
+// BackoffConfig defines the parameters for the default gRPC backoff strategy.
+type BackoffConfig struct {
+ // MaxDelay is the upper bound of backoff delay.
+ MaxDelay time.Duration
+}
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..c266f4e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/balancer.go
@@ -0,0 +1,364 @@
+/*
+ *
+ * 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
+}
+
+// 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.
+ UpdateBalancerState(s connectivity.State, p Picker)
+
+ // ResolveNow is called by balancer to notify gRPC to do a name resolving.
+ ResolveNow(resolver.ResolveNowOption)
+
+ // 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 contains addition information for the Pick operation.
+type PickOptions struct {
+ // FullMethodName is the method name that NewClientStream() is called
+ // with. The canonical format is /service/Method.
+ FullMethodName string
+}
+
+// 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 = 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().
+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:
+ // - 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 unavailable 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, opts PickOptions) (conn SubConn, done func(DoneInfo), err 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 connectivity.State
+ // TODO: add last connection 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
+}
+
+// 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.
+ UpdateClientConnState(ClientConnState)
+ // 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.
+ numTransientFailure uint64 // Number of addrConns in transientFailure.
+}
+
+// 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
+ case connectivity.TransientFailure:
+ cse.numTransientFailure += 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..1af88f0
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -0,0 +1,184 @@
+/*
+ *
+ * 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"
+
+ "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
+ config Config
+}
+
+func (bb *baseBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
+ return &baseBalancer{
+ cc: cc,
+ pickerBuilder: bb.pickerBuilder,
+
+ subConns: make(map[resolver.Address]balancer.SubConn),
+ scStates: make(map[balancer.SubConn]connectivity.State),
+ csEvltr: &balancer.ConnectivityStateEvaluator{},
+ // Initialize picker to a picker that always return
+ // ErrNoSubConnAvailable, because when state of a SubConn changes, we
+ // may call UpdateBalancerState with this picker.
+ picker: NewErrPicker(balancer.ErrNoSubConnAvailable),
+ config: bb.config,
+ }
+}
+
+func (bb *baseBuilder) Name() string {
+ return bb.name
+}
+
+type baseBalancer struct {
+ cc balancer.ClientConn
+ pickerBuilder PickerBuilder
+
+ csEvltr *balancer.ConnectivityStateEvaluator
+ state connectivity.State
+
+ subConns map[resolver.Address]balancer.SubConn
+ scStates map[balancer.SubConn]connectivity.State
+ picker balancer.Picker
+ config Config
+}
+
+func (b *baseBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
+ panic("not implemented")
+}
+
+func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) {
+ // 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.
+ }
+ }
+}
+
+// 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() {
+ if b.state == connectivity.TransientFailure {
+ b.picker = NewErrPicker(balancer.ErrTransientFailure)
+ return
+ }
+ 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)
+}
+
+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()
+ }
+
+ b.cc.UpdateBalancerState(b.state, b.picker)
+}
+
+// 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(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
+ return nil, nil, 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..34b1f29
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/base/base.go
@@ -0,0 +1,64 @@
+/*
+ *
+ * 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
+}
+
+// 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,
+ }
+}
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..29f7a4d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
@@ -0,0 +1,83 @@
+/*
+ *
+ * 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 (
+ "context"
+ "sync"
+
+ "google.golang.org/grpc/balancer"
+ "google.golang.org/grpc/balancer/base"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/internal/grpcrand"
+ "google.golang.org/grpc/resolver"
+)
+
+// 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.NewBalancerBuilderWithConfig(Name, &rrPickerBuilder{}, base.Config{HealthCheck: true})
+}
+
+func init() {
+ balancer.Register(newBuilder())
+}
+
+type rrPickerBuilder struct{}
+
+func (*rrPickerBuilder) Build(readySCs map[resolver.Address]balancer.SubConn) balancer.Picker {
+ grpclog.Infof("roundrobinPicker: newPicker called with readySCs: %v", readySCs)
+ if len(readySCs) == 0 {
+ return base.NewErrPicker(balancer.ErrNoSubConnAvailable)
+ }
+ var scs []balancer.SubConn
+ for _, sc := range 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(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
+ p.mu.Lock()
+ sc := p.subConns[p.next]
+ p.next = (p.next + 1) % len(p.subConns)
+ p.mu.Unlock()
+ return sc, nil, 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..8df4095
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
@@ -0,0 +1,318 @@
+/*
+ *
+ * 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/resolver"
+)
+
+// scStateUpdate contains the subConn and the new state it changed to.
+type scStateUpdate struct {
+ sc balancer.SubConn
+ state connectivity.State
+}
+
+// scStateUpdateBuffer is an unbounded channel for scStateChangeTuple.
+// TODO make a general purpose buffer that uses interface{}.
+type scStateUpdateBuffer struct {
+ c chan *scStateUpdate
+ mu sync.Mutex
+ backlog []*scStateUpdate
+}
+
+func newSCStateUpdateBuffer() *scStateUpdateBuffer {
+ return &scStateUpdateBuffer{
+ c: make(chan *scStateUpdate, 1),
+ }
+}
+
+func (b *scStateUpdateBuffer) put(t *scStateUpdate) {
+ b.mu.Lock()
+ defer b.mu.Unlock()
+ if len(b.backlog) == 0 {
+ select {
+ case b.c <- t:
+ return
+ default:
+ }
+ }
+ b.backlog = append(b.backlog, t)
+}
+
+func (b *scStateUpdateBuffer) load() {
+ b.mu.Lock()
+ defer b.mu.Unlock()
+ if len(b.backlog) > 0 {
+ select {
+ case b.c <- b.backlog[0]:
+ b.backlog[0] = nil
+ b.backlog = b.backlog[1:]
+ default:
+ }
+ }
+}
+
+// get returns the channel that the scStateUpdate will be sent to.
+//
+// Upon receiving, the caller should call load to send another
+// scStateChangeTuple onto the channel if there is any.
+func (b *scStateUpdateBuffer) get() <-chan *scStateUpdate {
+ return b.c
+}
+
+// ccBalancerWrapper is a wrapper on top of cc for balancers.
+// It implements balancer.ClientConn interface.
+type ccBalancerWrapper struct {
+ cc *ClientConn
+ balancer balancer.Balancer
+ stateChangeQueue *scStateUpdateBuffer
+ ccUpdateCh chan *balancer.ClientConnState
+ done chan struct{}
+
+ mu sync.Mutex
+ subConns map[*acBalancerWrapper]struct{}
+}
+
+func newCCBalancerWrapper(cc *ClientConn, b balancer.Builder, bopts balancer.BuildOptions) *ccBalancerWrapper {
+ ccb := &ccBalancerWrapper{
+ cc: cc,
+ stateChangeQueue: newSCStateUpdateBuffer(),
+ ccUpdateCh: make(chan *balancer.ClientConnState, 1),
+ done: make(chan struct{}),
+ 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.stateChangeQueue.get():
+ ccb.stateChangeQueue.load()
+ select {
+ case <-ccb.done:
+ ccb.balancer.Close()
+ return
+ default:
+ }
+ if ub, ok := ccb.balancer.(balancer.V2Balancer); ok {
+ ub.UpdateSubConnState(t.sc, balancer.SubConnState{ConnectivityState: t.state})
+ } else {
+ ccb.balancer.HandleSubConnStateChange(t.sc, t.state)
+ }
+ case s := <-ccb.ccUpdateCh:
+ select {
+ case <-ccb.done:
+ ccb.balancer.Close()
+ return
+ default:
+ }
+ if ub, ok := ccb.balancer.(balancer.V2Balancer); ok {
+ ub.UpdateClientConnState(*s)
+ } else {
+ ccb.balancer.HandleResolvedAddrs(s.ResolverState.Addresses, nil)
+ }
+ case <-ccb.done:
+ }
+
+ select {
+ case <-ccb.done:
+ 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.UpdateBalancerState(connectivity.Connecting, nil)
+ return
+ default:
+ }
+ ccb.cc.firstResolveEvent.Fire()
+ }
+}
+
+func (ccb *ccBalancerWrapper) close() {
+ close(ccb.done)
+}
+
+func (ccb *ccBalancerWrapper) handleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
+ // 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.stateChangeQueue.put(&scStateUpdate{
+ sc: sc,
+ state: s,
+ })
+}
+
+func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnState) {
+ if ccb.cc.curBalancerName != grpclbName {
+ // Filter any grpclb addresses since we don't have the grpclb balancer.
+ s := &ccs.ResolverState
+ 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++
+ }
+ }
+ select {
+ case <-ccb.ccUpdateCh:
+ default:
+ }
+ ccb.ccUpdateCh <- ccs
+}
+
+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) ResolveNow(o resolver.ResolveNowOption) {
+ 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..66e9a44
--- /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 (
+ "context"
+ "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.UpdateBalancerState(connectivity.Idle, 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.UpdateBalancerState(bw.state, 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(ctx context.Context, opts balancer.PickOptions) (sc balancer.SubConn, done func(balancer.DoneInfo), err error) {
+ failfast := true // Default failfast is true.
+ if ss, ok := rpcInfoFromContext(ctx); ok {
+ failfast = ss.failfast
+ }
+ a, p, err := bw.balancer.Get(ctx, BalancerGetOptions{BlockingWait: !failfast})
+ if err != nil {
+ return nil, nil, err
+ }
+ if p != nil {
+ 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 _, sc := range bw.conns {
+ return sc, done, nil
+ }
+ return nil, nil, balancer.ErrNoSubConnAvailable
+ }
+ sc, ok1 := bw.conns[resolver.Address{
+ Addr: a.Addr,
+ Type: resolver.Backend,
+ ServerName: "",
+ Metadata: a.Metadata,
+ }]
+ s, ok2 := bw.connSt[sc]
+ 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 nil, nil, balancer.ErrNoSubConnAvailable
+ }
+ switch s.s {
+ case connectivity.Ready, connectivity.Idle:
+ return sc, done, 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 nil, nil, 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 nil, nil, 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
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+ 0xad, 0x2e, 0x1c, 0xe4, 0x67, 0x47, 0x97, 0xb0, 0x4f, 0xd3, 0xcd, 0x65, 0x6a, 0xcd, 0x52, 0xab,
+ 0xd6, 0x6e, 0x7e, 0xe0, 0x9e, 0x72, 0xc3, 0x61, 0x45, 0xb7, 0x5e, 0x41, 0xe3, 0x1f, 0x38, 0x32,
+ 0xa0, 0xf4, 0x2b, 0x5d, 0xcb, 0xec, 0x55, 0x9c, 0x7e, 0xa2, 0x63, 0xd8, 0x5f, 0x91, 0x70, 0x49,
+ 0xb3, 0xdc, 0xca, 0xb0, 0xfe, 0xd4, 0x40, 0xcf, 0xe6, 0x18, 0x5d, 0x64, 0xdb, 0x59, 0x93, 0xcb,
+ 0xf5, 0xec, 0xf1, 0x89, 0xb7, 0x0b, 0x3b, 0xd9, 0x04, 0x9d, 0x28, 0x34, 0xeb, 0xb0, 0xdc, 0x4c,
+ 0x1f, 0x8f, 0x20, 0x76, 0x63, 0xc6, 0x85, 0xac, 0x6a, 0x03, 0x57, 0x82, 0x78, 0xcc, 0xb8, 0xb0,
+ 0x1c, 0x28, 0xcb, 0x1d, 0x61, 0x40, 0xfd, 0xde, 0x76, 0x68, 0x40, 0x55, 0x22, 0x83, 0xf1, 0xed,
+ 0xd7, 0x86, 0x56, 0x34, 0x2f, 0x8d, 0xbd, 0x8d, 0xf9, 0x76, 0x34, 0xf8, 0xc1, 0x28, 0x75, 0x7f,
+ 0x86, 0xe3, 0x80, 0xed, 0x1e, 0xb2, 0x7b, 0xd8, 0x95, 0xd6, 0x90, 0xf9, 0xe3, 0xb4, 0x51, 0xc7,
+ 0xda, 0x4f, 0xed, 0xac, 0x71, 0x7d, 0x16, 0x92, 0xc8, 0xb7, 0x19, 0x57, 0x4f, 0xf3, 0x87, 0x5e,
+ 0xea, 0xbb, 0x8a, 0xec, 0xf2, 0x8b, 0xbf, 0x03, 0x00, 0x00, 0xff, 0xff, 0xe7, 0xf6, 0x4b, 0x50,
+ 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..a7643df
--- /dev/null
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -0,0 +1,1447 @@
+/*
+ *
+ * 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/roundrobin" // To register roundrobin.
+ "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/resolver/dns" // To register dns resolver.
+ _ "google.golang.org/grpc/resolver/passthrough" // To register passthrough resolver.
+ "google.golang.org/grpc/serviceconfig"
+ "google.golang.org/grpc/status"
+)
+
+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 {
+ sc, err := parseServiceConfig(*cc.dopts.defaultServiceConfigRawJSON)
+ if err != nil {
+ return nil, fmt.Errorf("%s: %v", invalidDefaultServiceConfigErrPrefix, err)
+ }
+ cc.dopts.defaultServiceConfig = sc
+ }
+ 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.Exponential{
+ MaxDelay: DefaultBackoffConfig.MaxDelay,
+ }
+ }
+ 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 client connection to an RPC server.
+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
+ }
+}
+
+func (cc *ClientConn) updateResolverState(s resolver.State) error {
+ cc.mu.Lock()
+ defer cc.mu.Unlock()
+ // 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 {
+ return nil
+ }
+
+ if cc.dopts.disableServiceConfig || s.ServiceConfig == nil {
+ if cc.dopts.defaultServiceConfig != nil && cc.sc == nil {
+ cc.applyServiceConfig(cc.dopts.defaultServiceConfig)
+ }
+ } else if sc, ok := s.ServiceConfig.(*ServiceConfig); ok {
+ cc.applyServiceConfig(sc)
+ }
+
+ var balCfg serviceconfig.LoadBalancingConfig
+ 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
+ balCfg = cc.sc.lbConfig.cfg
+ } else {
+ var isGRPCLB bool
+ for _, a := range s.Addresses {
+ 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)
+ }
+
+ cc.balancerWrapper.updateClientConnState(&balancer.ClientConnState{ResolverState: s, BalancerConfig: balCfg})
+ return nil
+}
+
+// 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) {
+ 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)
+ 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)
+ 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.PickOptions{
+ FullMethodName: method,
+ })
+ if err != nil {
+ return nil, nil, toRPCErr(err)
+ }
+ return t, done, nil
+}
+
+func (cc *ClientConn) applyServiceConfig(sc *ServiceConfig) error {
+ if sc == nil {
+ // should never reach here.
+ return fmt.Errorf("got nil pointer for service config")
+ }
+ 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))
+ }
+
+ return nil
+}
+
+func (cc *ClientConn) resolveNow(o resolver.ResolveNowOption) {
+ 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()
+ defer cc.mu.Unlock()
+ for ac := range cc.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) {
+ 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)
+}
+
+// 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.ResolveNowOption{})
+ }
+
+ 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)
+ 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)
+
+ // 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) {
+ 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
+ }
+ ac.cc.blockingpicker.updateConnectionError(err)
+ }
+
+ // Couldn't connect to any address.
+ return nil, resolver.Address{}, nil, fmt.Errorf("couldn't connect to any address")
+}
+
+// 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()
+
+ target := transport.TargetInfo{
+ Addr: addr.Addr,
+ Metadata: addr.Metadata,
+ Authority: ac.cc.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)
+ }
+ })
+ 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)
+ }
+ })
+ 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(connectDeadline.Sub(time.Now())):
+ // 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)
+ }
+ }()
+
+ 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) {
+ ac.mu.Lock()
+ defer ac.mu.Unlock()
+ if ac.transport != currentTr {
+ return
+ }
+ ac.updateConnectivityState(s)
+ }
+ // 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 cancelation / etc.
+ ac.updateConnectivityState(connectivity.Shutdown)
+ 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 beng 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 100755
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..8ea3d4a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -0,0 +1,336 @@
+/*
+ *
+ * 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"
+ "crypto/tls"
+ "crypto/x509"
+ "errors"
+ "fmt"
+ "io/ioutil"
+ "net"
+ "strings"
+
+ "github.com/golang/protobuf/proto"
+ "google.golang.org/grpc/credentials/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.
+ // 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)
+}
+
+// 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 == "" {
+ colonPos := strings.LastIndex(authority, ":")
+ if colonPos == -1 {
+ colonPos = len(authority)
+ }
+ cfg.ServerName = authority[:colonPos]
+ }
+ 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
+}
+
+// ChannelzSecurityInfo defines the interface that security protocols should implement
+// in order to provide security info to channelz.
+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.
+type ChannelzSecurityValue interface {
+ isChannelzSecurityValue()
+}
+
+// TLSChannelzSecurityValue defines the struct that TLS protocol should return
+// from GetSecurityValue(), containing security info like cipher and certificate used.
+type TLSChannelzSecurityValue struct {
+ ChannelzSecurityValue
+ StandardName string
+ LocalCertificate []byte
+ RemoteCertificate []byte
+}
+
+// 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.
+type OtherChannelzSecurityValue struct {
+ ChannelzSecurityValue
+ Name string
+ Value proto.Message
+}
+
+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/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/tls13.go b/vendor/google.golang.org/grpc/credentials/tls13.go
new file mode 100644
index 0000000..ccbf35b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/tls13.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/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
new file mode 100644
index 0000000..e8f34d0
--- /dev/null
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -0,0 +1,554 @@
+/*
+ *
+ * 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/balancer"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/internal"
+ "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 backoff.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
+}
+
+// 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
+ })
+}
+
+// WithBackoffMaxDelay configures the dialer to use the provided maximum delay
+// when backing off after failed connection attempts.
+func WithBackoffMaxDelay(md time.Duration) DialOption {
+ return WithBackoffConfig(BackoffConfig{MaxDelay: md})
+}
+
+// WithBackoffConfig configures the dialer to use the provided backoff
+// parameters after connection failures.
+//
+// Use WithBackoffMaxDelay until more parameters on BackoffConfig are opened up
+// for use.
+func WithBackoffConfig(b BackoffConfig) DialOption {
+ return withBackoff(backoff.Exponential{
+ MaxDelay: b.MaxDelay,
+ })
+}
+
+// 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 backoff.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 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).
+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,
+ },
+ }
+}
+
+// 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
+ })
+}
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..30a75da
--- /dev/null
+++ b/vendor/google.golang.org/grpc/encoding/encoding.go
@@ -0,0 +1,118 @@
+/*
+ *
+ * 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
+}
+
+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..c1a8340
--- /dev/null
+++ b/vendor/google.golang.org/grpc/go.mod
@@ -0,0 +1,19 @@
+module google.golang.org/grpc
+
+require (
+ cloud.google.com/go v0.26.0 // indirect
+ github.com/BurntSushi/toml v0.3.1 // indirect
+ github.com/client9/misspell v0.3.4
+ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+ github.com/golang/mock v1.1.1
+ github.com/golang/protobuf v1.2.0
+ github.com/google/go-cmp v0.2.0
+ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3
+ 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
+ golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135
+ google.golang.org/appengine v1.1.0 // indirect
+ google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8
+ honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc
+)
diff --git a/vendor/google.golang.org/grpc/go.sum b/vendor/google.golang.org/grpc/go.sum
new file mode 100644
index 0000000..741677d
--- /dev/null
+++ b/vendor/google.golang.org/grpc/go.sum
@@ -0,0 +1,37 @@
+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 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+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 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/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=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3 h1:XQyxROzUlZH+WIQwySDgnISgOivlhjIEwaQaJEJrrN0=
+golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+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 v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+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 v0.0.0-20190311212946-11955173bddd h1:/e+gpKk9r3dJobndpTytxS2gOy6m5uvpg+ISQoEcusQ=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 h1:5Beo0mZN8dRzgrMMkDp0jc8YXQKx9DiJ2k1dkvGsn5A=
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+google.golang.org/appengine v1.1.0 h1:igQkv0AAhEIvTEpD5LIpAfav2eeVO9HBTjvKHVJPRSs=
+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc h1:/hemPrYIhOhy8zYrNj+069zDB68us2sMGsfkFJO0iZs=
+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..51bb945
--- /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 calles 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 100755
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..1bd0cce
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/backoff/backoff.go
@@ -0,0 +1,78 @@
+/*
+ *
+ * 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"
+
+ "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
+}
+
+const (
+ // baseDelay is the amount of time to wait before retrying after the first
+ // failure.
+ baseDelay = 1.0 * time.Second
+ // factor is applied to the backoff after each retry.
+ factor = 1.6
+ // jitter provides a range to randomize backoff delays.
+ jitter = 0.2
+)
+
+// Exponential implements exponential backoff algorithm as defined in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+type Exponential struct {
+ // MaxDelay is the upper bound of backoff delay.
+ MaxDelay time.Duration
+}
+
+// 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 baseDelay
+ }
+ backoff, max := float64(baseDelay), float64(bc.MaxDelay)
+ for backoff < max && retries > 0 {
+ backoff *= factor
+ 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 + 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..fee6aec
--- /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 varialbe 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 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 rules for method %v found", method)
+ }
+ if _, ok := l.methods[method]; ok {
+ return fmt.Errorf("conflicting 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 rules for method %v found", method)
+ }
+ if _, ok := l.methods[method]; ok {
+ return fmt.Errorf("conflicting 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..4cc2525
--- /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 privous 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 allowd 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 100755
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..20d044f
--- /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() marshalls 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/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..bc1f99a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -0,0 +1,71 @@
+/*
+ * 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 exported by dialoptions.go
+ WithResolverBuilder interface{} // func (resolver.Builder) grpc.DialOption
+ // WithHealthCheckFunc is not exported 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
+ // ParseServiceConfig is a function to parse JSON service configs into
+ // opaque data structures.
+ ParseServiceConfig func(sc string) (interface{}, error)
+ // 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
+)
+
+// 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), 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/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..b8e0aa4
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
@@ -0,0 +1,930 @@
+/*
+ *
+ * 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) (bool, 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)
+ sendPing, err := hdr.initStream(str.id)
+ if 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
+ if sendPing {
+ return l.pingHandler(&ping{data: [8]byte{}})
+ }
+ 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..78f9ddc
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
@@ -0,0 +1,431 @@
+/*
+ *
+ * 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{})
+ }
+ }
+ 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{})
+ }
+ }
+ 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..41a79c5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -0,0 +1,1411 @@
+/*
+ *
+ * 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/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"
+)
+
+// http2Client implements the ClientTransport interface with HTTP2.
+type http2Client struct {
+ 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{}
+ // awakenKeepalive is used to wake up keepalive when after it has gone dormant.
+ awakenKeepalive 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
+
+ // Boolean to keep track of reading activity on transport.
+ // 1 is true and 0 is false.
+ activity uint32 // Accessed atomically.
+ 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
+
+ // Fields below are for channelz metric collection.
+ channelzID int64 // channelz unique identification number
+ czData *channelzData
+
+ onGoAway func(GoAwayReason)
+ onClose func()
+
+ bufferPool *bufferPool
+}
+
+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{}),
+ awakenKeepalive: make(chan struct{}, 1),
+ 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,
+ }
+ }
+ // Make sure awakenKeepalive can't be written upon.
+ // keepalive routine will make it writable, if need be.
+ t.awakenKeepalive <- struct{}{}
+ 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 {
+ 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)
+ }
+ }
+
+ 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{
+ 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 {
+ pr := &peer.Peer{
+ Addr: t.remoteAddr,
+ }
+ // Attach Auth info if there is any.
+ if t.authInfo != nil {
+ pr.AuthInfo = t.authInfo
+ }
+ return pr
+}
+
+func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr) ([]hpack.HeaderField, error) {
+ aud := t.createAudience(callHdr)
+ authData, err := t.getTrAuthData(ctx, aud)
+ if err != nil {
+ return nil, err
+ }
+ callAuthData, err := t.getCallAuthData(ctx, 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})
+ }
+ 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) (bool, 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 false, err
+ }
+ t.activeStreams[id] = s
+ if channelz.IsOn() {
+ atomic.AddInt64(&t.czData.streamsStarted, 1)
+ atomic.StoreInt64(&t.czData.lastStreamCreatedTime, time.Now().UnixNano())
+ }
+ var sendPing bool
+ // If the number of active streams change from 0 to 1, then check if keepalive
+ // has gone dormant. If so, wake it up.
+ if len(t.activeStreams) == 1 && t.keepaliveEnabled {
+ select {
+ case t.awakenKeepalive <- struct{}{}:
+ sendPing = true
+ // Fill the awakenKeepalive channel again as this channel must be
+ // kept non-writable except at the point that the keepalive()
+ // goroutine is waiting either to be awaken or shutdown.
+ t.awakenKeepalive <- struct{}{}
+ default:
+ }
+ }
+ t.mu.Unlock()
+ return sendPing, 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 {
+ outHeader := &stats.OutHeader{
+ Client: true,
+ FullMethod: callHdr.Method,
+ RemoteAddr: t.remoteAddr,
+ LocalAddr: t.localAddr,
+ Compression: callHdr.SendCompress,
+ }
+ 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
+ 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, bool) {
+ t.mu.Lock()
+ defer t.mu.Unlock()
+ s, ok := t.activeStreams[f.Header().StreamID]
+ return s, ok
+}
+
+// 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, ok := t.getStream(f)
+ if !ok {
+ 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, ok := t.getStream(f)
+ if !ok {
+ 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, ok := t.getStream(frame)
+ if !ok {
+ 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),
+ }
+ t.statsHandler.HandleRPC(s.ctx, inHeader)
+ } else {
+ inTrailer := &stats.InTrailer{
+ Client: true,
+ WireLength: int(frame.Header().Length),
+ }
+ t.statsHandler.HandleRPC(s.ctx, inTrailer)
+ }
+ }
+ }()
+
+ // If headerChan hasn't been closed yet
+ if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
+ 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.CompareAndSwapUint32(&t.activity, 0, 1)
+ }
+ 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.CompareAndSwapUint32(&t.activity, 0, 1)
+ }
+ 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)
+ }
+ }
+}
+
+// keepalive running in a separate goroutune makes sure the connection is alive by sending pings.
+func (t *http2Client) keepalive() {
+ p := &ping{data: [8]byte{}}
+ timer := time.NewTimer(t.kp.Time)
+ for {
+ select {
+ case <-timer.C:
+ if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
+ timer.Reset(t.kp.Time)
+ continue
+ }
+ // Check if keepalive should go dormant.
+ t.mu.Lock()
+ if len(t.activeStreams) < 1 && !t.kp.PermitWithoutStream {
+ // Make awakenKeepalive writable.
+ <-t.awakenKeepalive
+ t.mu.Unlock()
+ select {
+ case <-t.awakenKeepalive:
+ // If the control gets here a ping has been sent
+ // need to reset the timer with keepalive.Timeout.
+ case <-t.ctx.Done():
+ return
+ }
+ } else {
+ t.mu.Unlock()
+ if channelz.IsOn() {
+ atomic.AddInt64(&t.czData.kpCount, 1)
+ }
+ // Send ping.
+ t.controlBuf.put(p)
+ }
+
+ // By the time control gets here a ping has been sent one way or the other.
+ timer.Reset(t.kp.Timeout)
+ select {
+ case <-timer.C:
+ if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
+ timer.Reset(t.kp.Time)
+ continue
+ }
+ infof("transport: closing client transport due to idleness.")
+ t.Close()
+ return
+ case <-t.ctx.Done():
+ if !timer.Stop() {
+ <-timer.C
+ }
+ return
+ }
+ 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..4e26f6a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -0,0 +1,1223 @@
+/*
+ *
+ * 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)
+)
+
+// http2Server implements the ServerTransport interface with HTTP2.
+type http2Server struct {
+ ctx context.Context
+ ctxDone <-chan struct{} // Cache the context.Done() chan
+ cancel context.CancelFunc
+ 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
+ // Flag to keep track of reading activity on transport.
+ // 1 is true and 0 is false.
+ activity uint32 // Accessed atomically.
+ // 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
+}
+
+// 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 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
+ }
+ ctx, cancel := context.WithCancel(context.Background())
+ t := &http2Server{
+ ctx: ctx,
+ cancel: cancel,
+ ctxDone: ctx.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.ctxDone)
+ 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.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.StoreUint32(&t.activity, 1)
+ 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() {},
+ })
+ return false
+ }
+ }
+ t.mu.Lock()
+ if t.state != reachable {
+ t.mu.Unlock()
+ 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() {},
+ })
+ 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)
+ 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),
+ }
+ 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(®isterStream{
+ 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.StoreUint32(&t.activity, 1)
+ 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 metedata 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{}
+ 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{})
+ }
+ 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.ctx.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.ctx.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{}
+ var pingSent bool
+ maxIdle := time.NewTimer(t.kp.MaxConnectionIdle)
+ maxAge := time.NewTimer(t.kp.MaxConnectionAge)
+ keepalive := time.NewTimer(t.kp.Time)
+ // NOTE: All exit paths of this function should reset their
+ // respective timers. A failure to do so will cause the
+ // following clean-up to deadlock and eventually leak.
+ defer func() {
+ if !maxIdle.Stop() {
+ <-maxIdle.C
+ }
+ if !maxAge.Stop() {
+ <-maxAge.C
+ }
+ if !keepalive.Stop() {
+ <-keepalive.C
+ }
+ }()
+ for {
+ select {
+ case <-maxIdle.C:
+ t.mu.Lock()
+ idle := t.idle
+ if idle.IsZero() { // The connection is non-idle.
+ t.mu.Unlock()
+ maxIdle.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{})
+ // Resetting the timer so that the clean-up doesn't deadlock.
+ maxIdle.Reset(infinity)
+ return
+ }
+ maxIdle.Reset(val)
+ case <-maxAge.C:
+ t.drain(http2.ErrCodeNo, []byte{})
+ maxAge.Reset(t.kp.MaxConnectionAgeGrace)
+ select {
+ case <-maxAge.C:
+ // Close the connection after grace period.
+ infof("transport: closing server transport due to maximum connection age.")
+ t.Close()
+ // Resetting the timer so that the clean-up doesn't deadlock.
+ maxAge.Reset(infinity)
+ case <-t.ctx.Done():
+ }
+ return
+ case <-keepalive.C:
+ if atomic.CompareAndSwapUint32(&t.activity, 1, 0) {
+ pingSent = false
+ keepalive.Reset(t.kp.Time)
+ continue
+ }
+ if pingSent {
+ infof("transport: closing server transport due to idleness.")
+ t.Close()
+ // Resetting the timer so that the clean-up doesn't deadlock.
+ keepalive.Reset(infinity)
+ return
+ }
+ pingSent = true
+ if channelz.IsOn() {
+ atomic.AddInt64(&t.czData.kpCount, 1)
+ }
+ t.controlBuf.put(p)
+ keepalive.Reset(t.kp.Timeout)
+ case <-t.ctx.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()
+ t.cancel()
+ 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.ctx.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.ctxDone:
+ 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..1c1d106
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -0,0 +1,816 @@
+/*
+ *
+ * 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 controlBuffer only in that recvBuffer
+// holds a channel of only recvMsg structs instead of objects implementing "item" interface.
+// recvBuffer is written to much more often than
+// controlBuffer 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
+ 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.
+
+ // 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() error {
+ if s.headerChan == nil {
+ // On the server headerChan is always nil since a stream originates
+ // only after having received headers.
+ return nil
+ }
+ select {
+ case <-s.ctx.Done():
+ // We prefer success over failure when reading messages because we delay
+ // context error in stream.Read(). To keep behavior consistent, we also
+ // prefer success here.
+ select {
+ case <-s.headerChan:
+ return nil
+ default:
+ }
+ return ContextErr(s.ctx.Err())
+ case <-s.headerChan:
+ return nil
+ }
+}
+
+// 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 {
+ if err := s.waitOnHeader(); err != nil {
+ return ""
+ }
+ 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.
+func (s *Stream) Header() (metadata.MD, error) {
+ if s.headerChan == nil && s.header != 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
+ }
+ err := s.waitOnHeader()
+ // Even if the stream is closed, header is returned if available.
+ select {
+ case <-s.headerChan:
+ if s.header == nil {
+ return nil, nil
+ }
+ return s.header.Copy(), nil
+ default:
+ }
+ return nil, err
+}
+
+// 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. If a context error happens
+// first, returns it as a status error. Client-side only.
+func (s *Stream) TrailersOnly() (bool, error) {
+ err := s.waitOnHeader()
+ if err != nil {
+ return false, err
+ }
+ return s.noHeaders, nil
+}
+
+// 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
+}
+
+// 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..45baa2a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/picker_wrapper.go
@@ -0,0 +1,197 @@
+/*
+ *
+ * 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"
+ "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"
+)
+
+// 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.Picker
+
+ // The latest connection happened.
+ connErrMu sync.Mutex
+ connErr error
+}
+
+func newPickerWrapper() *pickerWrapper {
+ bp := &pickerWrapper{blockingCh: make(chan struct{})}
+ return bp
+}
+
+func (bp *pickerWrapper) updateConnectionError(err error) {
+ bp.connErrMu.Lock()
+ bp.connErr = err
+ bp.connErrMu.Unlock()
+}
+
+func (bp *pickerWrapper) connectionError() error {
+ bp.connErrMu.Lock()
+ err := bp.connErr
+ bp.connErrMu.Unlock()
+ return err
+}
+
+// updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
+func (bp *pickerWrapper) updatePicker(p balancer.Picker) {
+ bp.mu.Lock()
+ if bp.done {
+ bp.mu.Unlock()
+ return
+ }
+ bp.picker = p
+ // bp.blockingCh should never be nil.
+ close(bp.blockingCh)
+ bp.blockingCh = make(chan struct{})
+ bp.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 (bp *pickerWrapper) pick(ctx context.Context, failfast bool, opts balancer.PickOptions) (transport.ClientTransport, func(balancer.DoneInfo), error) {
+ var ch chan struct{}
+
+ for {
+ bp.mu.Lock()
+ if bp.done {
+ bp.mu.Unlock()
+ return nil, nil, ErrClientConnClosing
+ }
+
+ if bp.picker == nil {
+ ch = bp.blockingCh
+ }
+ if ch == bp.blockingCh {
+ // This could happen when either:
+ // - bp.picker is nil (the previous if condition), or
+ // - has called pick on the current picker.
+ bp.mu.Unlock()
+ select {
+ case <-ctx.Done():
+ if connectionErr := bp.connectionError(); connectionErr != nil {
+ switch ctx.Err() {
+ case context.DeadlineExceeded:
+ return nil, nil, status.Errorf(codes.DeadlineExceeded, "latest connection error: %v", connectionErr)
+ case context.Canceled:
+ return nil, nil, status.Errorf(codes.Canceled, "latest connection error: %v", connectionErr)
+ }
+ }
+ return nil, nil, ctx.Err()
+ case <-ch:
+ }
+ continue
+ }
+
+ ch = bp.blockingCh
+ p := bp.picker
+ bp.mu.Unlock()
+
+ subConn, done, err := p.Pick(ctx, opts)
+
+ if err != nil {
+ switch err {
+ case balancer.ErrNoSubConnAvailable:
+ continue
+ case balancer.ErrTransientFailure:
+ if !failfast {
+ continue
+ }
+ return nil, nil, status.Errorf(codes.Unavailable, "%v, latest connection error: %v", err, bp.connectionError())
+ case context.DeadlineExceeded:
+ return nil, nil, status.Error(codes.DeadlineExceeded, err.Error())
+ case context.Canceled:
+ return nil, nil, status.Error(codes.Canceled, err.Error())
+ default:
+ 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 := 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, done), nil
+ }
+ return t, done, nil
+ }
+ if done != nil {
+ // Calling done with nil error, no bytes sent and no bytes received.
+ // DoneInfo with default value works.
+ 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 (bp *pickerWrapper) close() {
+ bp.mu.Lock()
+ defer bp.mu.Unlock()
+ if bp.done {
+ return
+ }
+ bp.done = true
+ close(bp.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..ed05b02
--- /dev/null
+++ b/vendor/google.golang.org/grpc/pickfirst.go
@@ -0,0 +1,118 @@
+/*
+ *
+ * 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"
+
+ "google.golang.org/grpc/balancer"
+ "google.golang.org/grpc/connectivity"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/resolver"
+)
+
+// 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 {
+ cc balancer.ClientConn
+ sc balancer.SubConn
+}
+
+func (b *pickfirstBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
+ if err != nil {
+ if grpclog.V(2) {
+ grpclog.Infof("pickfirstBalancer: HandleResolvedAddrs called with error %v", err)
+ }
+ return
+ }
+ if b.sc == nil {
+ b.sc, err = b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
+ if err != nil {
+ //TODO(yuxuanli): why not change the cc state to Idle?
+ if grpclog.V(2) {
+ grpclog.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
+ }
+ return
+ }
+ b.cc.UpdateBalancerState(connectivity.Idle, &picker{sc: b.sc})
+ b.sc.Connect()
+ } else {
+ b.sc.UpdateAddresses(addrs)
+ b.sc.Connect()
+ }
+}
+
+func (b *pickfirstBalancer) HandleSubConnStateChange(sc balancer.SubConn, s connectivity.State) {
+ 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
+ }
+ if s == connectivity.Shutdown {
+ b.sc = nil
+ return
+ }
+
+ switch s {
+ case connectivity.Ready, connectivity.Idle:
+ b.cc.UpdateBalancerState(s, &picker{sc: sc})
+ case connectivity.Connecting:
+ b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrNoSubConnAvailable})
+ case connectivity.TransientFailure:
+ b.cc.UpdateBalancerState(s, &picker{err: balancer.ErrTransientFailure})
+ }
+}
+
+func (b *pickfirstBalancer) Close() {
+}
+
+type picker struct {
+ err error
+ sc balancer.SubConn
+}
+
+func (p *picker) Pick(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
+ if p.err != nil {
+ return nil, nil, p.err
+ }
+ return p.sc, nil, nil
+}
+
+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/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go
new file mode 100644
index 0000000..297492e
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go
@@ -0,0 +1,457 @@
+/*
+ *
+ * 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/backoff"
+ "google.golang.org/grpc/internal/grpcrand"
+ "google.golang.org/grpc/resolver"
+)
+
+func init() {
+ resolver.Register(NewBuilder())
+}
+
+const (
+ defaultPort = "443"
+ defaultFreq = time.Minute * 30
+ 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{minFreq: defaultFreq}
+}
+
+type dnsBuilder struct {
+ // minimum frequency of polling the DNS server.
+ minFreq time.Duration
+}
+
+// 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.BuildOption) (resolver.Resolver, error) {
+ host, port, err := parseTarget(target.Endpoint, defaultPort)
+ if err != nil {
+ return nil, err
+ }
+
+ // IP address.
+ if net.ParseIP(host) != nil {
+ host, _ = formatIP(host)
+ addr := []resolver.Address{{Addr: host + ":" + port}}
+ i := &ipResolver{
+ cc: cc,
+ ip: addr,
+ rn: make(chan struct{}, 1),
+ q: make(chan struct{}),
+ }
+ cc.NewAddress(addr)
+ go i.watcher()
+ return i, nil
+ }
+
+ // DNS address (non-IP).
+ ctx, cancel := context.WithCancel(context.Background())
+ d := &dnsResolver{
+ freq: b.minFreq,
+ backoff: backoff.Exponential{MaxDelay: b.minFreq},
+ host: host,
+ port: port,
+ ctx: ctx,
+ cancel: cancel,
+ cc: cc,
+ t: time.NewTimer(0),
+ 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()
+ 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)
+}
+
+// ipResolver watches for the name resolution update for an IP address.
+type ipResolver struct {
+ cc resolver.ClientConn
+ ip []resolver.Address
+ // rn channel is used by ResolveNow() to force an immediate resolution of the target.
+ rn chan struct{}
+ q chan struct{}
+}
+
+// ResolveNow resend the address it stores, no resolution is needed.
+func (i *ipResolver) ResolveNow(opt resolver.ResolveNowOption) {
+ select {
+ case i.rn <- struct{}{}:
+ default:
+ }
+}
+
+// Close closes the ipResolver.
+func (i *ipResolver) Close() {
+ close(i.q)
+}
+
+func (i *ipResolver) watcher() {
+ for {
+ select {
+ case <-i.rn:
+ i.cc.NewAddress(i.ip)
+ case <-i.q:
+ return
+ }
+ }
+}
+
+// dnsResolver watches for the name resolution update for a non-IP target.
+type dnsResolver struct {
+ freq time.Duration
+ backoff backoff.Exponential
+ retryCount int
+ 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{}
+ t *time.Timer
+ // 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(opt resolver.ResolveNowOption) {
+ select {
+ case d.rn <- struct{}{}:
+ default:
+ }
+}
+
+// Close closes the dnsResolver.
+func (d *dnsResolver) Close() {
+ d.cancel()
+ d.wg.Wait()
+ d.t.Stop()
+}
+
+func (d *dnsResolver) watcher() {
+ defer d.wg.Done()
+ for {
+ select {
+ case <-d.ctx.Done():
+ return
+ case <-d.t.C:
+ case <-d.rn:
+ if !d.t.Stop() {
+ // Before resetting a timer, it should be stopped to prevent racing with
+ // reads on it's channel.
+ <-d.t.C
+ }
+ }
+
+ result, sc := d.lookup()
+ // Next lookup should happen within an interval defined by d.freq. It may be
+ // more often due to exponential retry on empty address list.
+ if len(result) == 0 {
+ d.retryCount++
+ d.t.Reset(d.backoff.Backoff(d.retryCount))
+ } else {
+ d.retryCount = 0
+ d.t.Reset(d.freq)
+ }
+ d.cc.NewServiceConfig(sc)
+ d.cc.NewAddress(result)
+
+ // 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 {
+ 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
+}
+
+func (d *dnsResolver) lookupTXT() string {
+ ss, err := d.resolver.LookupTXT(d.ctx, txtPrefix+d.host)
+ if err != nil {
+ grpclog.Infof("grpc: failed dns TXT record lookup due to %v.\n", err)
+ return ""
+ }
+ 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: TXT record %v missing %v attribute", res, txtAttribute)
+ return ""
+ }
+ return strings.TrimPrefix(res, txtAttribute)
+}
+
+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.Address, string) {
+ newAddrs := d.lookupSRV()
+ // Support fallback to non-balancer address.
+ newAddrs = append(newAddrs, d.lookupHost()...)
+ if d.disableServiceConfig {
+ return newAddrs, ""
+ }
+ sc := d.lookupTXT()
+ return newAddrs, canaryingSC(sc)
+}
+
+// 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/resolver/passthrough/passthrough.go b/vendor/google.golang.org/grpc/resolver/passthrough/passthrough.go
new file mode 100644
index 0000000..893d5d1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/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.BuildOption) (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.ResolveNowOption) {}
+
+func (*passthroughResolver) Close() {}
+
+func init() {
+ resolver.Register(&passthroughBuilder{})
+}
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..e83da34
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver/resolver.go
@@ -0,0 +1,193 @@
+/*
+ *
+ * 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 (
+ "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.
+type AddressType uint8
+
+const (
+ // Backend indicates the address is for a backend server.
+ Backend AddressType = iota
+ // GRPCLB indicates the address is for a grpclb load balancer.
+ 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
+ // Type is the type of this address.
+ Type AddressType
+ // ServerName is the name of this address.
+ //
+ // e.g. if Type is GRPCLB, ServerName should be the name of the remote load
+ // balancer, not the name of the backend.
+ ServerName string
+ // Metadata is the information associated with Addr, which may be used
+ // to make load balancing decision.
+ Metadata interface{}
+}
+
+// BuildOption includes additional information for the builder to create
+// the resolver.
+type BuildOption struct {
+ // DisableServiceConfig indicates whether resolver should fetch service config data.
+ DisableServiceConfig bool
+}
+
+// State contains the current Resolver state relevant to the ClientConn.
+type State struct {
+ Addresses []Address // Resolved addresses for the target
+ // ServiceConfig is the parsed service config; obtained from
+ // serviceconfig.Parse.
+ ServiceConfig serviceconfig.Config
+
+ // TODO: add Err error
+}
+
+// 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)
+ // 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)
+}
+
+// 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 BuildOption) (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 includes additional information for ResolveNow.
+type ResolveNowOption 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(ResolveNowOption)
+ // 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..6934905
--- /dev/null
+++ b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
@@ -0,0 +1,168 @@
+/*
+ *
+ * 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/atomic"
+
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/internal/channelz"
+ "google.golang.org/grpc/resolver"
+)
+
+// ccResolverWrapper is a wrapper on top of cc for resolvers.
+// It implements resolver.ClientConnection interface.
+type ccResolverWrapper struct {
+ cc *ClientConn
+ resolver resolver.Resolver
+ addrCh chan []resolver.Address
+ scCh chan string
+ done uint32 // accessed atomically; set to 1 when closed.
+ curState resolver.State
+}
+
+// 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 parses cc.target for scheme and gets the resolver
+// builder for this scheme and builds the resolver. The monitoring goroutine
+// for it is not started yet and can be created by calling start().
+//
+// If withResolverBuilder dial option is set, the specified resolver will be
+// used instead.
+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,
+ addrCh: make(chan []resolver.Address, 1),
+ scCh: make(chan string, 1),
+ }
+
+ var err error
+ ccr.resolver, err = rb.Build(cc.parsedTarget, ccr, resolver.BuildOption{DisableServiceConfig: cc.dopts.disableServiceConfig})
+ if err != nil {
+ return nil, err
+ }
+ return ccr, nil
+}
+
+func (ccr *ccResolverWrapper) resolveNow(o resolver.ResolveNowOption) {
+ ccr.resolver.ResolveNow(o)
+}
+
+func (ccr *ccResolverWrapper) close() {
+ ccr.resolver.Close()
+ atomic.StoreUint32(&ccr.done, 1)
+}
+
+func (ccr *ccResolverWrapper) isDone() bool {
+ return atomic.LoadUint32(&ccr.done) == 1
+}
+
+func (ccr *ccResolverWrapper) UpdateState(s resolver.State) {
+ if ccr.isDone() {
+ return
+ }
+ grpclog.Infof("ccResolverWrapper: sending update to cc: %v", s)
+ if channelz.IsOn() {
+ ccr.addChannelzTraceEvent(s)
+ }
+ ccr.cc.updateResolverState(s)
+ ccr.curState = s
+}
+
+// NewAddress is called by the resolver implementation to send addresses to gRPC.
+func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
+ if ccr.isDone() {
+ 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.cc.updateResolverState(ccr.curState)
+}
+
+// NewServiceConfig is called by the resolver implementation to send service
+// configs to gRPC.
+func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
+ if ccr.isDone() {
+ return
+ }
+ grpclog.Infof("ccResolverWrapper: got new service config: %v", sc)
+ c, err := parseServiceConfig(sc)
+ if err != nil {
+ return
+ }
+ if channelz.IsOn() {
+ ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: c})
+ }
+ ccr.curState.ServiceConfig = c
+ ccr.cc.updateResolverState(ccr.curState)
+}
+
+func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
+ var updates []string
+ oldSC, oldOK := ccr.curState.ServiceConfig.(*ServiceConfig)
+ newSC, newOK := s.ServiceConfig.(*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..088c3f1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@@ -0,0 +1,863 @@
+/*
+ *
+ * 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()
+ }
+
+ 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))
+ if err != nil {
+ return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
+ }
+ } else {
+ dcReader, err := compressor.Decompress(bytes.NewReader(d))
+ if err != nil {
+ return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", 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))
+ if err != nil {
+ return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
+ }
+ }
+ }
+ if len(d) > 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)", len(d), maxReceiveMessageSize)
+ }
+ return d, nil
+}
+
+// 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..f064b73
--- /dev/null
+++ b/vendor/google.golang.org/grpc/server.go
@@ -0,0 +1,1510 @@
+/*
+ *
+ * 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
+}
+
+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 has full access to the Context of the request and the
+// stream, and the invocation bypasses interceptors.
+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
+ })
+}
+
+// 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,
+ }
+ 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) {
+ if channelz.IsOn() {
+ s.incrCallsStarted()
+ defer func() {
+ if err != nil && err != io.EOF {
+ s.incrCallsFailed()
+ } else {
+ s.incrCallsSucceeded()
+ }
+ }()
+ }
+ sh := s.opts.statsHandler
+ if sh != nil {
+ beginTime := time.Now()
+ begin := &stats.Begin{
+ BeginTime: beginTime,
+ }
+ sh.HandleRPC(stream.Context(), begin)
+ defer func() {
+ end := &stats.End{
+ BeginTime: beginTime,
+ EndTime: time.Now(),
+ }
+ if err != nil && err != io.EOF {
+ end.Error = toRPCErr(err)
+ }
+ sh.HandleRPC(stream.Context(), end)
+ }()
+ }
+ if trInfo != nil {
+ defer trInfo.tr.Finish()
+ trInfo.tr.LazyLog(&trInfo.firstLine, false)
+ defer func() {
+ if err != nil && err != io.EOF {
+ trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+ trInfo.tr.SetError()
+ }
+ }()
+ }
+
+ 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()
+ defer func() {
+ if err != nil && err != io.EOF {
+ s.incrCallsFailed()
+ } else {
+ s.incrCallsSucceeded()
+ }
+ }()
+ }
+ sh := s.opts.statsHandler
+ if sh != nil {
+ beginTime := time.Now()
+ begin := &stats.Begin{
+ BeginTime: beginTime,
+ }
+ sh.HandleRPC(stream.Context(), begin)
+ defer func() {
+ end := &stats.End{
+ BeginTime: beginTime,
+ EndTime: time.Now(),
+ }
+ if err != nil && err != io.EOF {
+ end.Error = toRPCErr(err)
+ }
+ sh.HandleRPC(stream.Context(), end)
+ }()
+ }
+ 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,
+ }
+
+ 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)
+ defer func() {
+ 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()
+ }()
+ }
+ 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..d0787f1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/service_config.go
@@ -0,0 +1,429 @@
+/*
+ *
+ * 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.ParseServiceConfig = func(sc string) (interface{}, error) {
+ return parseServiceConfig(sc)
+ }
+}
+
+func parseServiceConfig(js string) (*ServiceConfig, error) {
+ if len(js) == 0 {
+ return nil, 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 nil, 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 nil, 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 nil, 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 rsc.MethodConfig == nil {
+ return &sc, nil
+ }
+ 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 nil, 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 nil, 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 nil, fmt.Errorf("invalid retry throttling config: maxTokens (%v) out of range (0, 1000]", mt)
+ }
+ if tr := sc.retryThrottling.TokenRatio; tr <= 0 {
+ return nil, fmt.Errorf("invalid retry throttling config: tokenRatio (%v) may not be negative", tr)
+ }
+ }
+ return &sc, nil
+}
+
+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..53b2787
--- /dev/null
+++ b/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
@@ -0,0 +1,48 @@
+/*
+ *
+ * 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
+
+import (
+ "google.golang.org/grpc/internal"
+)
+
+// Config represents an opaque data structure holding a service config.
+type Config interface {
+ isConfig()
+}
+
+// LoadBalancingConfig represents an opaque data structure holding a load
+// balancer config.
+type LoadBalancingConfig interface {
+ isLoadBalancingConfig()
+}
+
+// Parse parses the JSON service config provided into an internal form or
+// returns an error if the config is invalid.
+func Parse(ServiceConfigJSON string) (Config, error) {
+ c, err := internal.ParseServiceConfig(ServiceConfigJSON)
+ if err != nil {
+ return nil, err
+ }
+ return c.(Config), err
+}
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..f3f593c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stats/stats.go
@@ -0,0 +1,300 @@
+/*
+ *
+ * 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
+}
+
+// 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
+}
+
+// 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
+}
+
+// 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
+}
+
+// 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.
+ 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..134a624
--- /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 to, toErr := cs.attempt.s.TrailersOnly(); toErr != nil || !to {
+ 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..5888505
--- /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 = "1.23.1"
diff --git a/vendor/google.golang.org/grpc/vet.sh b/vendor/google.golang.org/grpc/vet.sh
new file mode 100755
index 0000000..661e1e1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/vet.sh
@@ -0,0 +1,134 @@
+#!/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 [[ "$1" = "-install" ]]; then
+ # Check for module support
+ if go help mod >& /dev/null; then
+ go install \
+ golang.org/x/lint/golint \
+ golang.org/x/tools/cmd/goimports \
+ honnef.co/go/tools/cmd/staticcheck \
+ github.com/client9/misspell/cmd/misspell \
+ github.com/golang/protobuf/protoc-gen-go
+ else
+ # Ye olde `go get` incantation.
+ # Note: this gets the latest version of all tools (vs. the pinned versions
+ # with Go modules).
+ go get -u \
+ golang.org/x/lint/golint \
+ golang.org/x/tools/cmd/goimports \
+ honnef.co/go/tools/cmd/staticcheck \
+ github.com/client9/misspell/cmd/misspell \
+ github.com/golang/protobuf/protoc-gen-go
+ fi
+ if [[ -z "${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 ls-files "*.go" | xargs grep -L "\(Copyright [0-9]\{4,\} gRPC authors\)\|DO NOT EDIT" 2>&1 | fail_on_output
+
+# - 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 math/rand for real library code. Use internal/grpcrand for
+# thread safety.
+git ls-files "*.go" | xargs grep -l '"math/rand"' 2>&1 | (! grep -v '^examples\|^stress\|grpcrand\|wrr_test')
+
+# - Ensure all ptypes proto packages are renamed when importing.
+git ls-files "*.go" | (! xargs grep "\(import \|^\s*\)\"github.com/golang/protobuf/ptypes/")
+
+# - 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:") | fail_on_output
+golint ./... 2>&1 | (! grep -vE "(_mock|\.pb)\.go:")
+go vet -all .
+
+# - 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.
+staticcheck -go 1.9 -checks 'inherit,-ST1015' -ignore '
+google.golang.org/grpc/balancer.go:SA1019
+google.golang.org/grpc/balancer/grpclb/grpclb_remote_balancer.go:SA1019
+google.golang.org/grpc/balancer/roundrobin/roundrobin_test.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/edsbalancer/balancergroup.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/xds.go:SA1019
+google.golang.org/grpc/xds/internal/balancer/xds_client.go:SA1019
+google.golang.org/grpc/balancer_conn_wrappers.go:SA1019
+google.golang.org/grpc/balancer_test.go:SA1019
+google.golang.org/grpc/benchmark/benchmain/main.go:SA1019
+google.golang.org/grpc/benchmark/worker/benchmark_client.go:SA1019
+google.golang.org/grpc/clientconn.go:S1024
+google.golang.org/grpc/clientconn_state_transition_test.go:SA1019
+google.golang.org/grpc/clientconn_test.go:SA1019
+google.golang.org/grpc/examples/features/debugging/client/main.go:SA1019
+google.golang.org/grpc/examples/features/load_balancing/client/main.go:SA1019
+google.golang.org/grpc/internal/transport/handler_server.go:SA1019
+google.golang.org/grpc/internal/transport/handler_server_test.go:SA1019
+google.golang.org/grpc/resolver/dns/dns_resolver.go:SA1019
+google.golang.org/grpc/stats/stats_test.go:SA1019
+google.golang.org/grpc/test/balancer_test.go:SA1019
+google.golang.org/grpc/test/channelz_test.go:SA1019
+google.golang.org/grpc/test/end2end_test.go:SA1019
+google.golang.org/grpc/test/healthcheck_test.go:SA1019
+' ./...
+misspell -error .