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authorMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
committerMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
commita031b83a09a8628435317a03f199cdc18b78262f (patch)
treebc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/google.golang.org
parent2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff)
downloadpodman-a031b83a09a8628435317a03f199cdc18b78262f.tar.gz
podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.bz2
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Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/google.golang.org')
-rw-r--r--vendor/google.golang.org/grpc/LICENSE28
-rw-r--r--vendor/google.golang.org/grpc/PATENTS22
-rw-r--r--vendor/google.golang.org/grpc/README.md32
-rw-r--r--vendor/google.golang.org/grpc/backoff.go80
-rw-r--r--vendor/google.golang.org/grpc/balancer.go400
-rw-r--r--vendor/google.golang.org/grpc/call.go232
-rw-r--r--vendor/google.golang.org/grpc/clientconn.go888
-rw-r--r--vendor/google.golang.org/grpc/codes/code_string.go16
-rw-r--r--vendor/google.golang.org/grpc/codes/codes.go159
-rw-r--r--vendor/google.golang.org/grpc/credentials/credentials.go232
-rw-r--r--vendor/google.golang.org/grpc/credentials/credentials_util_go17.go76
-rw-r--r--vendor/google.golang.org/grpc/credentials/credentials_util_pre_go17.go74
-rw-r--r--vendor/google.golang.org/grpc/doc.go6
-rw-r--r--vendor/google.golang.org/grpc/grpclog/logger.go93
-rw-r--r--vendor/google.golang.org/grpc/interceptor.go90
-rw-r--r--vendor/google.golang.org/grpc/internal/internal.go49
-rw-r--r--vendor/google.golang.org/grpc/metadata/metadata.go147
-rw-r--r--vendor/google.golang.org/grpc/naming/naming.go74
-rw-r--r--vendor/google.golang.org/grpc/peer/peer.go65
-rw-r--r--vendor/google.golang.org/grpc/rpc_util.go457
-rw-r--r--vendor/google.golang.org/grpc/server.go944
-rw-r--r--vendor/google.golang.org/grpc/stream.go526
-rw-r--r--vendor/google.golang.org/grpc/trace.go119
-rw-r--r--vendor/google.golang.org/grpc/transport/control.go215
-rw-r--r--vendor/google.golang.org/grpc/transport/go16.go46
-rw-r--r--vendor/google.golang.org/grpc/transport/go17.go46
-rw-r--r--vendor/google.golang.org/grpc/transport/handler_server.go397
-rw-r--r--vendor/google.golang.org/grpc/transport/http2_client.go1072
-rw-r--r--vendor/google.golang.org/grpc/transport/http2_server.go775
-rw-r--r--vendor/google.golang.org/grpc/transport/http_util.go513
-rw-r--r--vendor/google.golang.org/grpc/transport/pre_go16.go51
-rw-r--r--vendor/google.golang.org/grpc/transport/transport.go595
32 files changed, 8519 insertions, 0 deletions
diff --git a/vendor/google.golang.org/grpc/LICENSE b/vendor/google.golang.org/grpc/LICENSE
new file mode 100644
index 000000000..f4988b450
--- /dev/null
+++ b/vendor/google.golang.org/grpc/LICENSE
@@ -0,0 +1,28 @@
+Copyright 2014, Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/google.golang.org/grpc/PATENTS b/vendor/google.golang.org/grpc/PATENTS
new file mode 100644
index 000000000..69b47959f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the gRPC project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of gRPC, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of gRPC. This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation. If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of gRPC or any code incorporated within this
+implementation of gRPC constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of gRPC
+shall terminate as of the date such litigation is filed.
diff --git a/vendor/google.golang.org/grpc/README.md b/vendor/google.golang.org/grpc/README.md
new file mode 100644
index 000000000..110a8cf42
--- /dev/null
+++ b/vendor/google.golang.org/grpc/README.md
@@ -0,0 +1,32 @@
+#gRPC-Go
+
+[![Build Status](https://travis-ci.org/grpc/grpc-go.svg)](https://travis-ci.org/grpc/grpc-go) [![GoDoc](https://godoc.org/google.golang.org/grpc?status.svg)](https://godoc.org/google.golang.org/grpc)
+
+The Go implementation of [gRPC](http://www.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](http://www.grpc.io/docs/) 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 google.golang.org/grpc
+```
+
+Prerequisites
+-------------
+
+This requires Go 1.5 or later.
+
+Constraints
+-----------
+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](http://godoc.org/google.golang.org/grpc?imports), you need a discussion with gRPC-Go authors and consultants.
+
+Documentation
+-------------
+See [API documentation](https://godoc.org/google.golang.org/grpc) for package and API descriptions and find examples in the [examples directory](examples/).
+
+Status
+------
+GA
+
diff --git a/vendor/google.golang.org/grpc/backoff.go b/vendor/google.golang.org/grpc/backoff.go
new file mode 100644
index 000000000..c99024ee3
--- /dev/null
+++ b/vendor/google.golang.org/grpc/backoff.go
@@ -0,0 +1,80 @@
+package grpc
+
+import (
+ "math/rand"
+ "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,
+ baseDelay: 1.0 * time.Second,
+ factor: 1.6,
+ jitter: 0.2,
+ }
+)
+
+// backoffStrategy defines the methodology for backing off after a grpc
+// connection failure.
+//
+// This is unexported until the gRPC project decides whether or not to allow
+// alternative backoff strategies. Once a decision is made, this type and its
+// method may be exported.
+type backoffStrategy interface {
+ // backoff returns the amount of time to wait before the next retry given
+ // the number of consecutive failures.
+ backoff(retries int) time.Duration
+}
+
+// BackoffConfig defines the parameters for the default gRPC backoff strategy.
+type BackoffConfig struct {
+ // MaxDelay is the upper bound of backoff delay.
+ MaxDelay time.Duration
+
+ // TODO(stevvooe): The following fields are not exported, as allowing
+ // changes would violate the current gRPC specification for backoff. If
+ // gRPC decides to allow more interesting backoff strategies, these fields
+ // may be opened up in the future.
+
+ // baseDelay is the amount of time to wait before retrying after the first
+ // failure.
+ baseDelay time.Duration
+
+ // factor is applied to the backoff after each retry.
+ factor float64
+
+ // jitter provides a range to randomize backoff delays.
+ jitter float64
+}
+
+func setDefaults(bc *BackoffConfig) {
+ md := bc.MaxDelay
+ *bc = DefaultBackoffConfig
+
+ if md > 0 {
+ bc.MaxDelay = md
+ }
+}
+
+func (bc BackoffConfig) backoff(retries int) time.Duration {
+ if retries == 0 {
+ return bc.baseDelay
+ }
+ backoff, max := float64(bc.baseDelay), float64(bc.MaxDelay)
+ for backoff < max && retries > 0 {
+ backoff *= bc.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 + bc.jitter*(rand.Float64()*2-1)
+ if backoff < 0 {
+ return 0
+ }
+ return time.Duration(backoff)
+}
diff --git a/vendor/google.golang.org/grpc/balancer.go b/vendor/google.golang.org/grpc/balancer.go
new file mode 100644
index 000000000..9d943fbad
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer.go
@@ -0,0 +1,400 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "fmt"
+ "sync"
+
+ "golang.org/x/net/context"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/naming"
+)
+
+// 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
+ // Metadata is the information associated with Addr, which may be used
+ // to make load balancing decision.
+ Metadata interface{}
+}
+
+// BalancerConfig specifies the configurations for Balancer.
+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
+}
+
+// BalancerGetOptions configures a Get call.
+// This is the EXPERIMENTAL API and may be changed or extended in the future.
+type BalancerGetOptions struct {
+ // BlockingWait specifies whether Get should block when there is no
+ // connected address.
+ BlockingWait bool
+}
+
+// Balancer chooses network addresses for RPCs.
+// This is the EXPERIMENTAL API and may be changed or extended in the future.
+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
+}
+
+// downErr implements net.Error. It is constructed by gRPC internals and passed to the down
+// call of Balancer.
+type downErr struct {
+ timeout bool
+ temporary bool
+ desc string
+}
+
+func (e downErr) Error() string { return e.desc }
+func (e downErr) Timeout() bool { return e.timeout }
+func (e downErr) Temporary() bool { return e.temporary }
+
+func downErrorf(timeout, temporary bool, format string, a ...interface{}) downErr {
+ return downErr{
+ timeout: timeout,
+ temporary: temporary,
+ desc: fmt.Sprintf(format, a...),
+ }
+}
+
+// RoundRobin returns a Balancer that selects addresses round-robin. It uses r to watch
+// the name resolution updates and updates the addresses available correspondingly.
+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.Printf("grpc: the naming watcher stops working due to %v.\n", 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.Println("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.Println("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
+ }
+ 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)
+ 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 = 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()
+ 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
+}
diff --git a/vendor/google.golang.org/grpc/call.go b/vendor/google.golang.org/grpc/call.go
new file mode 100644
index 000000000..772c817ed
--- /dev/null
+++ b/vendor/google.golang.org/grpc/call.go
@@ -0,0 +1,232 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "bytes"
+ "io"
+ "math"
+ "time"
+
+ "golang.org/x/net/context"
+ "golang.org/x/net/trace"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/transport"
+)
+
+// recvResponse receives and parses an RPC response.
+// On error, it returns the error and indicates whether the call should be retried.
+//
+// TODO(zhaoq): Check whether the received message sequence is valid.
+func recvResponse(dopts dialOptions, t transport.ClientTransport, c *callInfo, stream *transport.Stream, reply interface{}) (err error) {
+ // Try to acquire header metadata from the server if there is any.
+ defer func() {
+ if err != nil {
+ if _, ok := err.(transport.ConnectionError); !ok {
+ t.CloseStream(stream, err)
+ }
+ }
+ }()
+ c.headerMD, err = stream.Header()
+ if err != nil {
+ return
+ }
+ p := &parser{r: stream}
+ for {
+ if err = recv(p, dopts.codec, stream, dopts.dc, reply, math.MaxInt32); err != nil {
+ if err == io.EOF {
+ break
+ }
+ return
+ }
+ }
+ c.trailerMD = stream.Trailer()
+ return nil
+}
+
+// sendRequest writes out various information of an RPC such as Context and Message.
+func sendRequest(ctx context.Context, codec Codec, compressor Compressor, callHdr *transport.CallHdr, t transport.ClientTransport, args interface{}, opts *transport.Options) (_ *transport.Stream, err error) {
+ stream, err := t.NewStream(ctx, callHdr)
+ if err != nil {
+ return nil, err
+ }
+ defer func() {
+ if err != nil {
+ // If err is connection error, t will be closed, no need to close stream here.
+ if _, ok := err.(transport.ConnectionError); !ok {
+ t.CloseStream(stream, err)
+ }
+ }
+ }()
+ var cbuf *bytes.Buffer
+ if compressor != nil {
+ cbuf = new(bytes.Buffer)
+ }
+ outBuf, err := encode(codec, args, compressor, cbuf)
+ if err != nil {
+ return nil, Errorf(codes.Internal, "grpc: %v", err)
+ }
+ err = t.Write(stream, outBuf, opts)
+ // t.NewStream(...) could lead to an early rejection of the RPC (e.g., the service/method
+ // does not exist.) so that t.Write could get io.EOF from wait(...). Leave the following
+ // recvResponse to get the final status.
+ if err != nil && err != io.EOF {
+ return nil, err
+ }
+ // Sent successfully.
+ return stream, nil
+}
+
+// Invoke sends the RPC request on the wire and returns after response is received.
+// Invoke is called by generated code. Also users can call Invoke directly when it
+// is really needed in their use cases.
+func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+ 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 invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) (err error) {
+ c := defaultCallInfo
+ for _, o := range opts {
+ if err := o.before(&c); err != nil {
+ return toRPCErr(err)
+ }
+ }
+ defer func() {
+ for _, o := range opts {
+ o.after(&c)
+ }
+ }()
+ if EnableTracing {
+ c.traceInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
+ defer c.traceInfo.tr.Finish()
+ c.traceInfo.firstLine.client = true
+ if deadline, ok := ctx.Deadline(); ok {
+ c.traceInfo.firstLine.deadline = deadline.Sub(time.Now())
+ }
+ c.traceInfo.tr.LazyLog(&c.traceInfo.firstLine, false)
+ // TODO(dsymonds): Arrange for c.traceInfo.firstLine.remoteAddr to be set.
+ defer func() {
+ if err != nil {
+ c.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+ c.traceInfo.tr.SetError()
+ }
+ }()
+ }
+ topts := &transport.Options{
+ Last: true,
+ Delay: false,
+ }
+ for {
+ var (
+ err error
+ t transport.ClientTransport
+ stream *transport.Stream
+ // Record the put handler from Balancer.Get(...). It is called once the
+ // RPC has completed or failed.
+ put func()
+ )
+ // TODO(zhaoq): Need a formal spec of fail-fast.
+ callHdr := &transport.CallHdr{
+ Host: cc.authority,
+ Method: method,
+ }
+ if cc.dopts.cp != nil {
+ callHdr.SendCompress = cc.dopts.cp.Type()
+ }
+ gopts := BalancerGetOptions{
+ BlockingWait: !c.failFast,
+ }
+ t, put, err = cc.getTransport(ctx, gopts)
+ if err != nil {
+ // TODO(zhaoq): Probably revisit the error handling.
+ if _, ok := err.(*rpcError); ok {
+ return err
+ }
+ if err == errConnClosing || err == errConnUnavailable {
+ if c.failFast {
+ return Errorf(codes.Unavailable, "%v", err)
+ }
+ continue
+ }
+ // All the other errors are treated as Internal errors.
+ return Errorf(codes.Internal, "%v", err)
+ }
+ if c.traceInfo.tr != nil {
+ c.traceInfo.tr.LazyLog(&payload{sent: true, msg: args}, true)
+ }
+ stream, err = sendRequest(ctx, cc.dopts.codec, cc.dopts.cp, callHdr, t, args, topts)
+ if err != nil {
+ if put != nil {
+ put()
+ put = nil
+ }
+ // Retry a non-failfast RPC when
+ // i) there is a connection error; or
+ // ii) the server started to drain before this RPC was initiated.
+ if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
+ if c.failFast {
+ return toRPCErr(err)
+ }
+ continue
+ }
+ return toRPCErr(err)
+ }
+ err = recvResponse(cc.dopts, t, &c, stream, reply)
+ if err != nil {
+ if put != nil {
+ put()
+ put = nil
+ }
+ if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
+ if c.failFast {
+ return toRPCErr(err)
+ }
+ continue
+ }
+ return toRPCErr(err)
+ }
+ if c.traceInfo.tr != nil {
+ c.traceInfo.tr.LazyLog(&payload{sent: false, msg: reply}, true)
+ }
+ t.CloseStream(stream, nil)
+ if put != nil {
+ put()
+ put = nil
+ }
+ return Errorf(stream.StatusCode(), "%s", stream.StatusDesc())
+ }
+}
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
new file mode 100644
index 000000000..61674729a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -0,0 +1,888 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "errors"
+ "fmt"
+ "net"
+ "strings"
+ "sync"
+ "time"
+
+ "golang.org/x/net/context"
+ "golang.org/x/net/trace"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/transport"
+)
+
+var (
+ // ErrClientConnClosing indicates that the operation is illegal because
+ // the ClientConn is closing.
+ ErrClientConnClosing = errors.New("grpc: the client connection is closing")
+ // ErrClientConnTimeout indicates that the ClientConn cannot establish the
+ // underlying connections within the specified timeout.
+ ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
+
+ // 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)")
+ // 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)")
+ // errNetworkIO indicates that the connection is down due to some network I/O error.
+ errNetworkIO = errors.New("grpc: failed with network I/O error")
+ // 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")
+ // errConnUnavailable indicates that the connection is unavailable.
+ errConnUnavailable = errors.New("grpc: the connection is unavailable")
+ errNoAddr = errors.New("grpc: there is no address available to dial")
+ // minimum time to give a connection to complete
+ minConnectTimeout = 20 * time.Second
+)
+
+// dialOptions configure a Dial call. dialOptions are set by the DialOption
+// values passed to Dial.
+type dialOptions struct {
+ unaryInt UnaryClientInterceptor
+ streamInt StreamClientInterceptor
+ codec Codec
+ cp Compressor
+ dc Decompressor
+ bs backoffStrategy
+ balancer Balancer
+ block bool
+ insecure bool
+ timeout time.Duration
+ copts transport.ConnectOptions
+}
+
+// DialOption configures how we set up the connection.
+type DialOption func(*dialOptions)
+
+// WithCodec returns a DialOption which sets a codec for message marshaling and unmarshaling.
+func WithCodec(c Codec) DialOption {
+ return func(o *dialOptions) {
+ o.codec = c
+ }
+}
+
+// WithCompressor returns a DialOption which sets a CompressorGenerator for generating message
+// compressor.
+func WithCompressor(cp Compressor) DialOption {
+ return func(o *dialOptions) {
+ o.cp = cp
+ }
+}
+
+// WithDecompressor returns a DialOption which sets a DecompressorGenerator for generating
+// message decompressor.
+func WithDecompressor(dc Decompressor) DialOption {
+ return func(o *dialOptions) {
+ o.dc = dc
+ }
+}
+
+// WithBalancer returns a DialOption which sets a load balancer.
+func WithBalancer(b Balancer) DialOption {
+ return func(o *dialOptions) {
+ o.balancer = b
+ }
+}
+
+// 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 {
+ // Set defaults to ensure that provided BackoffConfig is valid and
+ // unexported fields get default values.
+ setDefaults(&b)
+ return withBackoff(b)
+}
+
+// withBackoff sets the backoff strategy used for retries after a
+// failed connection attempt.
+//
+// This can be exported if arbitrary backoff strategies are allowed by gRPC.
+func withBackoff(bs backoffStrategy) DialOption {
+ return 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 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 func(o *dialOptions) {
+ o.insecure = true
+ }
+}
+
+// WithTransportCredentials returns a DialOption which configures a
+// connection level security credentials (e.g., TLS/SSL).
+func WithTransportCredentials(creds credentials.TransportCredentials) DialOption {
+ return func(o *dialOptions) {
+ o.copts.TransportCredentials = creds
+ }
+}
+
+// WithPerRPCCredentials returns a DialOption which sets
+// credentials which will place auth state on each outbound RPC.
+func WithPerRPCCredentials(creds credentials.PerRPCCredentials) DialOption {
+ return func(o *dialOptions) {
+ o.copts.PerRPCCredentials = append(o.copts.PerRPCCredentials, creds)
+ }
+}
+
+// WithTimeout returns a DialOption that configures a timeout for dialing a ClientConn
+// initially. This is valid if and only if WithBlock() is present.
+func WithTimeout(d time.Duration) DialOption {
+ return func(o *dialOptions) {
+ o.timeout = d
+ }
+}
+
+// WithDialer returns a DialOption that specifies a function to use for dialing network addresses.
+func WithDialer(f func(string, time.Duration) (net.Conn, error)) DialOption {
+ return func(o *dialOptions) {
+ o.copts.Dialer = func(ctx context.Context, addr string) (net.Conn, error) {
+ if deadline, ok := ctx.Deadline(); ok {
+ return f(addr, deadline.Sub(time.Now()))
+ }
+ return f(addr, 0)
+ }
+ }
+}
+
+// WithUserAgent returns a DialOption that specifies a user agent string for all the RPCs.
+func WithUserAgent(s string) DialOption {
+ return func(o *dialOptions) {
+ o.copts.UserAgent = s
+ }
+}
+
+// WithUnaryInterceptor returns a DialOption that specifies the interceptor for unary RPCs.
+func WithUnaryInterceptor(f UnaryClientInterceptor) DialOption {
+ return func(o *dialOptions) {
+ o.unaryInt = f
+ }
+}
+
+// WithStreamInterceptor returns a DialOption that specifies the interceptor for streaming RPCs.
+func WithStreamInterceptor(f StreamClientInterceptor) DialOption {
+ return func(o *dialOptions) {
+ o.streamInt = f
+ }
+}
+
+// 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. ctx can be used to
+// cancel or expire the pending connecting. 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.
+// This is the EXPERIMENTAL API.
+func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
+ cc := &ClientConn{
+ target: target,
+ conns: make(map[Address]*addrConn),
+ }
+ cc.ctx, cc.cancel = context.WithCancel(context.Background())
+ defer func() {
+ select {
+ case <-ctx.Done():
+ conn, err = nil, ctx.Err()
+ default:
+ }
+
+ if err != nil {
+ cc.Close()
+ }
+ }()
+
+ for _, opt := range opts {
+ opt(&cc.dopts)
+ }
+
+ // Set defaults.
+ if cc.dopts.codec == nil {
+ cc.dopts.codec = protoCodec{}
+ }
+ if cc.dopts.bs == nil {
+ cc.dopts.bs = DefaultBackoffConfig
+ }
+ creds := cc.dopts.copts.TransportCredentials
+ if creds != nil && creds.Info().ServerName != "" {
+ cc.authority = creds.Info().ServerName
+ } else {
+ colonPos := strings.LastIndex(target, ":")
+ if colonPos == -1 {
+ colonPos = len(target)
+ }
+ cc.authority = target[:colonPos]
+ }
+ var ok bool
+ waitC := make(chan error, 1)
+ go func() {
+ var addrs []Address
+ if cc.dopts.balancer == nil {
+ // Connect to target directly if balancer is nil.
+ addrs = append(addrs, Address{Addr: target})
+ } else {
+ var credsClone credentials.TransportCredentials
+ if creds != nil {
+ credsClone = creds.Clone()
+ }
+ config := BalancerConfig{
+ DialCreds: credsClone,
+ }
+ if err := cc.dopts.balancer.Start(target, config); err != nil {
+ waitC <- err
+ return
+ }
+ ch := cc.dopts.balancer.Notify()
+ if ch == nil {
+ // There is no name resolver installed.
+ addrs = append(addrs, Address{Addr: target})
+ } else {
+ addrs, ok = <-ch
+ if !ok || len(addrs) == 0 {
+ waitC <- errNoAddr
+ return
+ }
+ }
+ }
+ for _, a := range addrs {
+ if err := cc.resetAddrConn(a, false, nil); err != nil {
+ waitC <- err
+ return
+ }
+ }
+ close(waitC)
+ }()
+ var timeoutCh <-chan time.Time
+ if cc.dopts.timeout > 0 {
+ timeoutCh = time.After(cc.dopts.timeout)
+ }
+ select {
+ case <-ctx.Done():
+ return nil, ctx.Err()
+ case err := <-waitC:
+ if err != nil {
+ return nil, err
+ }
+ case <-timeoutCh:
+ return nil, ErrClientConnTimeout
+ }
+ // If balancer is nil or balancer.Notify() is nil, ok will be false here.
+ // The lbWatcher goroutine will not be created.
+ if ok {
+ go cc.lbWatcher()
+ }
+ return cc, nil
+}
+
+// ConnectivityState indicates the state of a client connection.
+type ConnectivityState int
+
+const (
+ // Idle indicates the ClientConn is idle.
+ Idle ConnectivityState = iota
+ // Connecting indicates the ClienConn 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
+)
+
+func (s ConnectivityState) 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:
+ panic(fmt.Sprintf("unknown connectivity state: %d", s))
+ }
+}
+
+// ClientConn represents a client connection to an RPC server.
+type ClientConn struct {
+ ctx context.Context
+ cancel context.CancelFunc
+
+ target string
+ authority string
+ dopts dialOptions
+
+ mu sync.RWMutex
+ conns map[Address]*addrConn
+}
+
+func (cc *ClientConn) lbWatcher() {
+ for addrs := range cc.dopts.balancer.Notify() {
+ var (
+ add []Address // Addresses need to setup connections.
+ del []*addrConn // Connections need to tear down.
+ )
+ cc.mu.Lock()
+ for _, a := range addrs {
+ if _, ok := cc.conns[a]; !ok {
+ add = append(add, a)
+ }
+ }
+ for k, c := range cc.conns {
+ var keep bool
+ for _, a := range addrs {
+ if k == a {
+ keep = true
+ break
+ }
+ }
+ if !keep {
+ del = append(del, c)
+ delete(cc.conns, c.addr)
+ }
+ }
+ cc.mu.Unlock()
+ for _, a := range add {
+ cc.resetAddrConn(a, true, nil)
+ }
+ for _, c := range del {
+ c.tearDown(errConnDrain)
+ }
+ }
+}
+
+// resetAddrConn creates an addrConn for addr and adds it to cc.conns.
+// If there is an old addrConn for addr, it will be torn down, using tearDownErr as the reason.
+// If tearDownErr is nil, errConnDrain will be used instead.
+func (cc *ClientConn) resetAddrConn(addr Address, skipWait bool, tearDownErr error) error {
+ ac := &addrConn{
+ cc: cc,
+ addr: addr,
+ dopts: cc.dopts,
+ }
+ ac.ctx, ac.cancel = context.WithCancel(cc.ctx)
+ ac.stateCV = sync.NewCond(&ac.mu)
+ if EnableTracing {
+ ac.events = trace.NewEventLog("grpc.ClientConn", ac.addr.Addr)
+ }
+ if !ac.dopts.insecure {
+ if ac.dopts.copts.TransportCredentials == nil {
+ return errNoTransportSecurity
+ }
+ } else {
+ if ac.dopts.copts.TransportCredentials != nil {
+ return errCredentialsConflict
+ }
+ for _, cd := range ac.dopts.copts.PerRPCCredentials {
+ if cd.RequireTransportSecurity() {
+ return errTransportCredentialsMissing
+ }
+ }
+ }
+ // 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 ErrClientConnClosing
+ }
+ stale := cc.conns[ac.addr]
+ cc.conns[ac.addr] = ac
+ cc.mu.Unlock()
+ if stale != nil {
+ // There is an addrConn alive on ac.addr already. This could be due to
+ // 1) a buggy Balancer notifies duplicated Addresses;
+ // 2) goaway was received, a new ac will replace the old ac.
+ // The old ac should be deleted from cc.conns, but the
+ // underlying transport should drain rather than close.
+ if tearDownErr == nil {
+ // tearDownErr is nil if resetAddrConn is called by
+ // 1) Dial
+ // 2) lbWatcher
+ // In both cases, the stale ac should drain, not close.
+ stale.tearDown(errConnDrain)
+ } else {
+ stale.tearDown(tearDownErr)
+ }
+ }
+ // skipWait may overwrite the decision in ac.dopts.block.
+ if ac.dopts.block && !skipWait {
+ if err := ac.resetTransport(false); err != nil {
+ if err != errConnClosing {
+ // Tear down ac and delete it from cc.conns.
+ cc.mu.Lock()
+ delete(cc.conns, ac.addr)
+ cc.mu.Unlock()
+ ac.tearDown(err)
+ }
+ if e, ok := err.(transport.ConnectionError); ok && !e.Temporary() {
+ return e.Origin()
+ }
+ return err
+ }
+ // Start to monitor the error status of transport.
+ go ac.transportMonitor()
+ } else {
+ // Start a goroutine connecting to the server asynchronously.
+ go func() {
+ if err := ac.resetTransport(false); err != nil {
+ grpclog.Printf("Failed to dial %s: %v; please retry.", ac.addr.Addr, err)
+ if err != errConnClosing {
+ // Keep this ac in cc.conns, to get the reason it's torn down.
+ ac.tearDown(err)
+ }
+ return
+ }
+ ac.transportMonitor()
+ }()
+ }
+ return nil
+}
+
+func (cc *ClientConn) getTransport(ctx context.Context, opts BalancerGetOptions) (transport.ClientTransport, func(), error) {
+ var (
+ ac *addrConn
+ ok bool
+ put func()
+ )
+ if cc.dopts.balancer == nil {
+ // If balancer is nil, there should be only one addrConn available.
+ cc.mu.RLock()
+ if cc.conns == nil {
+ cc.mu.RUnlock()
+ return nil, nil, toRPCErr(ErrClientConnClosing)
+ }
+ for _, ac = range cc.conns {
+ // Break after the first iteration to get the first addrConn.
+ ok = true
+ break
+ }
+ cc.mu.RUnlock()
+ } else {
+ var (
+ addr Address
+ err error
+ )
+ addr, put, err = cc.dopts.balancer.Get(ctx, opts)
+ if err != nil {
+ return nil, nil, toRPCErr(err)
+ }
+ cc.mu.RLock()
+ if cc.conns == nil {
+ cc.mu.RUnlock()
+ return nil, nil, toRPCErr(ErrClientConnClosing)
+ }
+ ac, ok = cc.conns[addr]
+ cc.mu.RUnlock()
+ }
+ if !ok {
+ if put != nil {
+ put()
+ }
+ return nil, nil, errConnClosing
+ }
+ t, err := ac.wait(ctx, cc.dopts.balancer != nil, !opts.BlockingWait)
+ if err != nil {
+ if put != nil {
+ put()
+ }
+ return nil, nil, err
+ }
+ return t, put, nil
+}
+
+// Close tears down the ClientConn and all underlying connections.
+func (cc *ClientConn) Close() error {
+ cc.cancel()
+
+ cc.mu.Lock()
+ if cc.conns == nil {
+ cc.mu.Unlock()
+ return ErrClientConnClosing
+ }
+ conns := cc.conns
+ cc.conns = nil
+ cc.mu.Unlock()
+ if cc.dopts.balancer != nil {
+ cc.dopts.balancer.Close()
+ }
+ for _, ac := range conns {
+ ac.tearDown(ErrClientConnClosing)
+ }
+ return nil
+}
+
+// addrConn is a network connection to a given address.
+type addrConn struct {
+ ctx context.Context
+ cancel context.CancelFunc
+
+ cc *ClientConn
+ addr Address
+ dopts dialOptions
+ events trace.EventLog
+
+ mu sync.Mutex
+ state ConnectivityState
+ stateCV *sync.Cond
+ down func(error) // the handler called when a connection is down.
+ // ready is closed and becomes nil when a new transport is up or failed
+ // due to timeout.
+ ready chan struct{}
+ transport transport.ClientTransport
+
+ // The reason this addrConn is torn down.
+ tearDownErr error
+}
+
+// printf records an event in ac's event log, unless ac has been closed.
+// REQUIRES ac.mu is held.
+func (ac *addrConn) printf(format string, a ...interface{}) {
+ if ac.events != nil {
+ ac.events.Printf(format, a...)
+ }
+}
+
+// errorf records an error in ac's event log, unless ac has been closed.
+// REQUIRES ac.mu is held.
+func (ac *addrConn) errorf(format string, a ...interface{}) {
+ if ac.events != nil {
+ ac.events.Errorf(format, a...)
+ }
+}
+
+// getState returns the connectivity state of the Conn
+func (ac *addrConn) getState() ConnectivityState {
+ ac.mu.Lock()
+ defer ac.mu.Unlock()
+ return ac.state
+}
+
+// waitForStateChange blocks until the state changes to something other than the sourceState.
+func (ac *addrConn) waitForStateChange(ctx context.Context, sourceState ConnectivityState) (ConnectivityState, error) {
+ ac.mu.Lock()
+ defer ac.mu.Unlock()
+ if sourceState != ac.state {
+ return ac.state, nil
+ }
+ done := make(chan struct{})
+ var err error
+ go func() {
+ select {
+ case <-ctx.Done():
+ ac.mu.Lock()
+ err = ctx.Err()
+ ac.stateCV.Broadcast()
+ ac.mu.Unlock()
+ case <-done:
+ }
+ }()
+ defer close(done)
+ for sourceState == ac.state {
+ ac.stateCV.Wait()
+ if err != nil {
+ return ac.state, err
+ }
+ }
+ return ac.state, nil
+}
+
+func (ac *addrConn) resetTransport(closeTransport bool) error {
+ for retries := 0; ; retries++ {
+ ac.mu.Lock()
+ ac.printf("connecting")
+ if ac.state == Shutdown {
+ // ac.tearDown(...) has been invoked.
+ ac.mu.Unlock()
+ return errConnClosing
+ }
+ if ac.down != nil {
+ ac.down(downErrorf(false, true, "%v", errNetworkIO))
+ ac.down = nil
+ }
+ ac.state = Connecting
+ ac.stateCV.Broadcast()
+ t := ac.transport
+ ac.mu.Unlock()
+ if closeTransport && t != nil {
+ t.Close()
+ }
+ sleepTime := ac.dopts.bs.backoff(retries)
+ timeout := minConnectTimeout
+ if timeout < sleepTime {
+ timeout = sleepTime
+ }
+ ctx, cancel := context.WithTimeout(ac.ctx, timeout)
+ connectTime := time.Now()
+ sinfo := transport.TargetInfo{
+ Addr: ac.addr.Addr,
+ Metadata: ac.addr.Metadata,
+ }
+ newTransport, err := transport.NewClientTransport(ctx, sinfo, ac.dopts.copts)
+ if err != nil {
+ cancel()
+
+ if e, ok := err.(transport.ConnectionError); ok && !e.Temporary() {
+ return err
+ }
+ grpclog.Printf("grpc: addrConn.resetTransport failed to create client transport: %v; Reconnecting to %v", err, ac.addr)
+ ac.mu.Lock()
+ if ac.state == Shutdown {
+ // ac.tearDown(...) has been invoked.
+ ac.mu.Unlock()
+ return errConnClosing
+ }
+ ac.errorf("transient failure: %v", err)
+ ac.state = TransientFailure
+ ac.stateCV.Broadcast()
+ if ac.ready != nil {
+ close(ac.ready)
+ ac.ready = nil
+ }
+ ac.mu.Unlock()
+ closeTransport = false
+ select {
+ case <-time.After(sleepTime - time.Since(connectTime)):
+ case <-ac.ctx.Done():
+ return ac.ctx.Err()
+ }
+ continue
+ }
+ ac.mu.Lock()
+ ac.printf("ready")
+ if ac.state == Shutdown {
+ // ac.tearDown(...) has been invoked.
+ ac.mu.Unlock()
+ newTransport.Close()
+ return errConnClosing
+ }
+ ac.state = Ready
+ ac.stateCV.Broadcast()
+ ac.transport = newTransport
+ if ac.ready != nil {
+ close(ac.ready)
+ ac.ready = nil
+ }
+ if ac.cc.dopts.balancer != nil {
+ ac.down = ac.cc.dopts.balancer.Up(ac.addr)
+ }
+ ac.mu.Unlock()
+ return nil
+ }
+}
+
+// Run in a goroutine to track the error in transport and create the
+// new transport if an error happens. It returns when the channel is closing.
+func (ac *addrConn) transportMonitor() {
+ for {
+ ac.mu.Lock()
+ t := ac.transport
+ ac.mu.Unlock()
+ select {
+ // This is needed to detect the teardown when
+ // the addrConn is idle (i.e., no RPC in flight).
+ case <-ac.ctx.Done():
+ select {
+ case <-t.Error():
+ t.Close()
+ default:
+ }
+ return
+ case <-t.GoAway():
+ // If GoAway happens without any network I/O error, ac is closed without shutting down the
+ // underlying transport (the transport will be closed when all the pending RPCs finished or
+ // failed.).
+ // If GoAway and some network I/O error happen concurrently, ac and its underlying transport
+ // are closed.
+ // In both cases, a new ac is created.
+ select {
+ case <-t.Error():
+ ac.cc.resetAddrConn(ac.addr, true, errNetworkIO)
+ default:
+ ac.cc.resetAddrConn(ac.addr, true, errConnDrain)
+ }
+ return
+ case <-t.Error():
+ select {
+ case <-ac.ctx.Done():
+ t.Close()
+ return
+ case <-t.GoAway():
+ ac.cc.resetAddrConn(ac.addr, true, errNetworkIO)
+ return
+ default:
+ }
+ ac.mu.Lock()
+ if ac.state == Shutdown {
+ // ac has been shutdown.
+ ac.mu.Unlock()
+ return
+ }
+ ac.state = TransientFailure
+ ac.stateCV.Broadcast()
+ ac.mu.Unlock()
+ if err := ac.resetTransport(true); err != nil {
+ ac.mu.Lock()
+ ac.printf("transport exiting: %v", err)
+ ac.mu.Unlock()
+ grpclog.Printf("grpc: addrConn.transportMonitor exits due to: %v", err)
+ if err != errConnClosing {
+ // Keep this ac in cc.conns, to get the reason it's torn down.
+ ac.tearDown(err)
+ }
+ return
+ }
+ }
+ }
+}
+
+// wait blocks until i) the new transport is up or ii) ctx is done or iii) ac is closed or
+// iv) transport is in TransientFailure and there is a balancer/failfast is true.
+func (ac *addrConn) wait(ctx context.Context, hasBalancer, failfast bool) (transport.ClientTransport, error) {
+ for {
+ ac.mu.Lock()
+ switch {
+ case ac.state == Shutdown:
+ if failfast || !hasBalancer {
+ // RPC is failfast or balancer is nil. This RPC should fail with ac.tearDownErr.
+ err := ac.tearDownErr
+ ac.mu.Unlock()
+ return nil, err
+ }
+ ac.mu.Unlock()
+ return nil, errConnClosing
+ case ac.state == Ready:
+ ct := ac.transport
+ ac.mu.Unlock()
+ return ct, nil
+ case ac.state == TransientFailure:
+ if failfast || hasBalancer {
+ ac.mu.Unlock()
+ return nil, errConnUnavailable
+ }
+ }
+ ready := ac.ready
+ if ready == nil {
+ ready = make(chan struct{})
+ ac.ready = ready
+ }
+ ac.mu.Unlock()
+ select {
+ case <-ctx.Done():
+ return nil, toRPCErr(ctx.Err())
+ // Wait until the new transport is ready or failed.
+ case <-ready:
+ }
+ }
+}
+
+// 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.cancel()
+
+ ac.mu.Lock()
+ defer ac.mu.Unlock()
+ if ac.down != nil {
+ ac.down(downErrorf(false, false, "%v", err))
+ ac.down = nil
+ }
+ if err == errConnDrain && ac.transport != 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.
+ ac.transport.GracefulClose()
+ }
+ if ac.state == Shutdown {
+ return
+ }
+ ac.state = Shutdown
+ ac.tearDownErr = err
+ ac.stateCV.Broadcast()
+ if ac.events != nil {
+ ac.events.Finish()
+ ac.events = nil
+ }
+ if ac.ready != nil {
+ close(ac.ready)
+ ac.ready = nil
+ }
+ if ac.transport != nil && err != errConnDrain {
+ ac.transport.Close()
+ }
+ return
+}
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 000000000..e6762d084
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codes/code_string.go
@@ -0,0 +1,16 @@
+// generated by stringer -type=Code; DO NOT EDIT
+
+package codes
+
+import "fmt"
+
+const _Code_name = "OKCanceledUnknownInvalidArgumentDeadlineExceededNotFoundAlreadyExistsPermissionDeniedResourceExhaustedFailedPreconditionAbortedOutOfRangeUnimplementedInternalUnavailableDataLossUnauthenticated"
+
+var _Code_index = [...]uint8{0, 2, 10, 17, 32, 48, 56, 69, 85, 102, 120, 127, 137, 150, 158, 169, 177, 192}
+
+func (i Code) String() string {
+ if i+1 >= Code(len(_Code_index)) {
+ return fmt.Sprintf("Code(%d)", i)
+ }
+ return _Code_name[_Code_index[i]:_Code_index[i+1]]
+}
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 000000000..e14b464ac
--- /dev/null
+++ b/vendor/google.golang.org/grpc/codes/codes.go
@@ -0,0 +1,159 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package codes defines the canonical error codes used by gRPC. It is
+// consistent across various languages.
+package codes // import "google.golang.org/grpc/codes"
+
+// A Code is an unsigned 32-bit error code as defined in the gRPC spec.
+type Code uint32
+
+//go:generate stringer -type=Code
+
+const (
+ // OK is returned on success.
+ OK Code = 0
+
+ // Canceled indicates the operation was cancelled (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
+
+ // Unauthenticated indicates the request does not have valid
+ // authentication credentials for the operation.
+ Unauthenticated Code = 16
+
+ // 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.
+ //
+ // See litmus test above for deciding between FailedPrecondition,
+ // Aborted, and Unavailable.
+ Unavailable Code = 14
+
+ // DataLoss indicates unrecoverable data loss or corruption.
+ DataLoss Code = 15
+)
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 000000000..5555ef024
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -0,0 +1,232 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// 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 (
+ "crypto/tls"
+ "crypto/x509"
+ "errors"
+ "fmt"
+ "io/ioutil"
+ "net"
+ "strings"
+
+ "golang.org/x/net/context"
+)
+
+var (
+ // alpnProtoStr are the specified application level protocols for gRPC.
+ alpnProtoStr = []string{"h2"}
+)
+
+// 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. 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
+}
+
+var (
+ // ErrConnDispatched indicates that rawConn has been dispatched out of gRPC
+ // and the caller should not close rawConn.
+ 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.
+ 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.
+ 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
+}
+
+// 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"
+}
+
+// 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, addr 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(addr, ":")
+ if colonPos == -1 {
+ colonPos = len(addr)
+ }
+ cfg.ServerName = addr[: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()
+ }
+ // TODO(zhaoq): Omit the auth info for client now. It is more for
+ // information than anything else.
+ return conn, nil, 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 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
+}
+
+// NewTLS uses c to construct a TransportCredentials based on TLS.
+func NewTLS(c *tls.Config) TransportCredentials {
+ tc := &tlsCreds{cloneTLSConfig(c)}
+ tc.config.NextProtos = alpnProtoStr
+ return tc
+}
+
+// NewClientTLSFromCert constructs a TLS 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 a TLS 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 a TLS from the input certificate for server.
+func NewServerTLSFromCert(cert *tls.Certificate) TransportCredentials {
+ return NewTLS(&tls.Config{Certificates: []tls.Certificate{*cert}})
+}
+
+// NewServerTLSFromFile constructs a TLS 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
+}
diff --git a/vendor/google.golang.org/grpc/credentials/credentials_util_go17.go b/vendor/google.golang.org/grpc/credentials/credentials_util_go17.go
new file mode 100644
index 000000000..9647b9ec8
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/credentials_util_go17.go
@@ -0,0 +1,76 @@
+// +build go1.7
+
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package credentials
+
+import (
+ "crypto/tls"
+)
+
+// 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 replace this function with official clone function.
+func cloneTLSConfig(cfg *tls.Config) *tls.Config {
+ if cfg == nil {
+ return &tls.Config{}
+ }
+ return &tls.Config{
+ Rand: cfg.Rand,
+ Time: cfg.Time,
+ Certificates: cfg.Certificates,
+ NameToCertificate: cfg.NameToCertificate,
+ GetCertificate: cfg.GetCertificate,
+ RootCAs: cfg.RootCAs,
+ NextProtos: cfg.NextProtos,
+ ServerName: cfg.ServerName,
+ ClientAuth: cfg.ClientAuth,
+ ClientCAs: cfg.ClientCAs,
+ InsecureSkipVerify: cfg.InsecureSkipVerify,
+ CipherSuites: cfg.CipherSuites,
+ PreferServerCipherSuites: cfg.PreferServerCipherSuites,
+ SessionTicketsDisabled: cfg.SessionTicketsDisabled,
+ SessionTicketKey: cfg.SessionTicketKey,
+ ClientSessionCache: cfg.ClientSessionCache,
+ MinVersion: cfg.MinVersion,
+ MaxVersion: cfg.MaxVersion,
+ CurvePreferences: cfg.CurvePreferences,
+ DynamicRecordSizingDisabled: cfg.DynamicRecordSizingDisabled,
+ Renegotiation: cfg.Renegotiation,
+ }
+}
diff --git a/vendor/google.golang.org/grpc/credentials/credentials_util_pre_go17.go b/vendor/google.golang.org/grpc/credentials/credentials_util_pre_go17.go
new file mode 100644
index 000000000..09b8d12c7
--- /dev/null
+++ b/vendor/google.golang.org/grpc/credentials/credentials_util_pre_go17.go
@@ -0,0 +1,74 @@
+// +build !go1.7
+
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package credentials
+
+import (
+ "crypto/tls"
+)
+
+// 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 replace this function with official clone function.
+func cloneTLSConfig(cfg *tls.Config) *tls.Config {
+ if cfg == nil {
+ return &tls.Config{}
+ }
+ return &tls.Config{
+ Rand: cfg.Rand,
+ Time: cfg.Time,
+ Certificates: cfg.Certificates,
+ NameToCertificate: cfg.NameToCertificate,
+ GetCertificate: cfg.GetCertificate,
+ RootCAs: cfg.RootCAs,
+ NextProtos: cfg.NextProtos,
+ ServerName: cfg.ServerName,
+ ClientAuth: cfg.ClientAuth,
+ ClientCAs: cfg.ClientCAs,
+ InsecureSkipVerify: cfg.InsecureSkipVerify,
+ CipherSuites: cfg.CipherSuites,
+ PreferServerCipherSuites: cfg.PreferServerCipherSuites,
+ SessionTicketsDisabled: cfg.SessionTicketsDisabled,
+ SessionTicketKey: cfg.SessionTicketKey,
+ ClientSessionCache: cfg.ClientSessionCache,
+ MinVersion: cfg.MinVersion,
+ MaxVersion: cfg.MaxVersion,
+ CurvePreferences: cfg.CurvePreferences,
+ }
+}
diff --git a/vendor/google.golang.org/grpc/doc.go b/vendor/google.golang.org/grpc/doc.go
new file mode 100644
index 000000000..a35f21885
--- /dev/null
+++ b/vendor/google.golang.org/grpc/doc.go
@@ -0,0 +1,6 @@
+/*
+Package grpc implements an RPC system called gRPC.
+
+See www.grpc.io for more information about gRPC.
+*/
+package grpc // import "google.golang.org/grpc"
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 000000000..3b2933079
--- /dev/null
+++ b/vendor/google.golang.org/grpc/grpclog/logger.go
@@ -0,0 +1,93 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+Package grpclog defines logging for grpc.
+*/
+package grpclog // import "google.golang.org/grpc/grpclog"
+
+import (
+ "log"
+ "os"
+)
+
+// Use golang's standard logger by default.
+// Access is not mutex-protected: do not modify except in init()
+// functions.
+var logger Logger = log.New(os.Stderr, "", log.LstdFlags)
+
+// Logger mimics golang's standard Logger as an interface.
+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.
+func SetLogger(l Logger) {
+ logger = l
+}
+
+// Fatal is equivalent to Print() followed by a call to os.Exit() with a non-zero exit code.
+func Fatal(args ...interface{}) {
+ logger.Fatal(args...)
+}
+
+// Fatalf is equivalent to Printf() followed by a call to os.Exit() with a non-zero exit code.
+func Fatalf(format string, args ...interface{}) {
+ logger.Fatalf(format, args...)
+}
+
+// Fatalln is equivalent to Println() followed by a call to os.Exit()) with a non-zero exit code.
+func Fatalln(args ...interface{}) {
+ logger.Fatalln(args...)
+}
+
+// Print prints to the logger. Arguments are handled in the manner of fmt.Print.
+func Print(args ...interface{}) {
+ logger.Print(args...)
+}
+
+// Printf prints to the logger. Arguments are handled in the manner of fmt.Printf.
+func Printf(format string, args ...interface{}) {
+ logger.Printf(format, args...)
+}
+
+// Println prints to the logger. Arguments are handled in the manner of fmt.Println.
+func Println(args ...interface{}) {
+ logger.Println(args...)
+}
diff --git a/vendor/google.golang.org/grpc/interceptor.go b/vendor/google.golang.org/grpc/interceptor.go
new file mode 100644
index 000000000..8d932efed
--- /dev/null
+++ b/vendor/google.golang.org/grpc/interceptor.go
@@ -0,0 +1,90 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "golang.org/x/net/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. inovker is the handler to complete the RPC
+// and it is the responsibility of the interceptor to call it.
+// This is the 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 handlder to create a ClientStream and it is the responsibility of the interceptor to call it.
+// This is the 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.
+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/internal.go b/vendor/google.golang.org/grpc/internal/internal.go
new file mode 100644
index 000000000..5489143a8
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package internal contains gRPC-internal code for testing, to avoid polluting
+// the godoc of the top-level grpc package.
+package internal
+
+// TestingCloseConns closes all existing transports but keeps
+// grpcServer.lis accepting new connections.
+//
+// The provided grpcServer must be of type *grpc.Server. It is untyped
+// for circular dependency reasons.
+var TestingCloseConns func(grpcServer interface{})
+
+// TestingUseHandlerImpl enables the http.Handler-based server implementation.
+// It must be called before Serve and requires TLS credentials.
+//
+// The provided grpcServer must be of type *grpc.Server. It is untyped
+// for circular dependency reasons.
+var TestingUseHandlerImpl func(grpcServer interface{})
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 000000000..3c0ca7a36
--- /dev/null
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -0,0 +1,147 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package metadata define the structure of the metadata supported by gRPC library.
+package metadata // import "google.golang.org/grpc/metadata"
+
+import (
+ "encoding/base64"
+ "fmt"
+ "strings"
+
+ "golang.org/x/net/context"
+)
+
+const (
+ binHdrSuffix = "-bin"
+)
+
+// encodeKeyValue encodes key and value qualified for transmission via gRPC.
+// Transmitting binary headers violates HTTP/2 spec.
+// TODO(zhaoq): Maybe check if k is ASCII also.
+func encodeKeyValue(k, v string) (string, string) {
+ k = strings.ToLower(k)
+ if strings.HasSuffix(k, binHdrSuffix) {
+ val := base64.StdEncoding.EncodeToString([]byte(v))
+ v = string(val)
+ }
+ return k, v
+}
+
+// DecodeKeyValue returns the original key and value corresponding to the
+// encoded data in k, v.
+// If k is a binary header and v contains comma, v is split on comma before decoded,
+// and the decoded v will be joined with comma before returned.
+func DecodeKeyValue(k, v string) (string, string, error) {
+ if !strings.HasSuffix(k, binHdrSuffix) {
+ return k, v, nil
+ }
+ vvs := strings.Split(v, ",")
+ for i, vv := range vvs {
+ val, err := base64.StdEncoding.DecodeString(vv)
+ if err != nil {
+ return "", "", err
+ }
+ vvs[i] = string(val)
+ }
+ return k, strings.Join(vvs, ","), 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 a MD from given key-value map.
+func New(m map[string]string) MD {
+ md := MD{}
+ for k, v := range m {
+ key, val := encodeKeyValue(k, v)
+ 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.
+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 k string
+ for i, s := range kv {
+ if i%2 == 0 {
+ k = s
+ continue
+ }
+ key, val := encodeKeyValue(k, s)
+ md[key] = append(md[key], val)
+ }
+ 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)
+}
+
+// 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 mdKey struct{}
+
+// NewContext creates a new context with md attached.
+func NewContext(ctx context.Context, md MD) context.Context {
+ return context.WithValue(ctx, mdKey{}, md)
+}
+
+// FromContext returns the MD in ctx if it exists.
+func FromContext(ctx context.Context) (md MD, ok bool) {
+ md, ok = ctx.Value(mdKey{}).(MD)
+ return
+}
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 000000000..c2e0871e6
--- /dev/null
+++ b/vendor/google.golang.org/grpc/naming/naming.go
@@ -0,0 +1,74 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package naming defines the naming API and related data structures for gRPC.
+// The interface is EXPERIMENTAL and may be suject to change.
+package naming
+
+// Operation defines the corresponding operations for a name resolution change.
+type Operation uint8
+
+const (
+ // Add indicates a new address is added.
+ Add Operation = iota
+ // Delete indicates an exisiting 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.
+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.
+type Resolver interface {
+ // Resolve creates a Watcher for target.
+ Resolve(target string) (Watcher, error)
+}
+
+// Watcher watches for the updates on the specified target.
+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 000000000..bfa6205ba
--- /dev/null
+++ b/vendor/google.golang.org/grpc/peer/peer.go
@@ -0,0 +1,65 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package peer defines various peer information associated with RPCs and
+// corresponding utils.
+package peer
+
+import (
+ "net"
+
+ "golang.org/x/net/context"
+ "google.golang.org/grpc/credentials"
+)
+
+// Peer contains the information of the peer for an RPC.
+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/rpc_util.go b/vendor/google.golang.org/grpc/rpc_util.go
new file mode 100644
index 000000000..a25eaa8a2
--- /dev/null
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@@ -0,0 +1,457 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "bytes"
+ "compress/gzip"
+ "encoding/binary"
+ "fmt"
+ "io"
+ "io/ioutil"
+ "math"
+ "os"
+
+ "github.com/golang/protobuf/proto"
+ "golang.org/x/net/context"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/metadata"
+ "google.golang.org/grpc/transport"
+)
+
+// Codec defines the interface gRPC uses to encode and decode messages.
+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. The returned
+ // string will be used as part of content type in transmission.
+ String() string
+}
+
+// protoCodec is a Codec implementation with protobuf. It is the default codec for gRPC.
+type protoCodec struct{}
+
+func (protoCodec) Marshal(v interface{}) ([]byte, error) {
+ return proto.Marshal(v.(proto.Message))
+}
+
+func (protoCodec) Unmarshal(data []byte, v interface{}) error {
+ return proto.Unmarshal(data, v.(proto.Message))
+}
+
+func (protoCodec) String() string {
+ return "proto"
+}
+
+// Compressor defines the interface gRPC uses to compress a message.
+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
+}
+
+// NewGZIPCompressor creates a Compressor based on GZIP.
+func NewGZIPCompressor() Compressor {
+ return &gzipCompressor{}
+}
+
+type gzipCompressor struct {
+}
+
+func (c *gzipCompressor) Do(w io.Writer, p []byte) error {
+ z := gzip.NewWriter(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.
+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 {
+}
+
+// NewGZIPDecompressor creates a Decompressor based on GZIP.
+func NewGZIPDecompressor() Decompressor {
+ return &gzipDecompressor{}
+}
+
+func (d *gzipDecompressor) Do(r io.Reader) ([]byte, error) {
+ z, err := gzip.NewReader(r)
+ if err != nil {
+ return nil, err
+ }
+ defer z.Close()
+ return ioutil.ReadAll(z)
+}
+
+func (d *gzipDecompressor) Type() string {
+ return "gzip"
+}
+
+// callInfo contains all related configuration and information about an RPC.
+type callInfo struct {
+ failFast bool
+ headerMD metadata.MD
+ trailerMD metadata.MD
+ traceInfo traceInfo // in trace.go
+}
+
+var defaultCallInfo = callInfo{failFast: true}
+
+// 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)
+}
+
+type beforeCall func(c *callInfo) error
+
+func (o beforeCall) before(c *callInfo) error { return o(c) }
+func (o beforeCall) after(c *callInfo) {}
+
+type afterCall func(c *callInfo)
+
+func (o afterCall) before(c *callInfo) error { return nil }
+func (o afterCall) after(c *callInfo) { o(c) }
+
+// Header returns a CallOptions that retrieves the header metadata
+// for a unary RPC.
+func Header(md *metadata.MD) CallOption {
+ return afterCall(func(c *callInfo) {
+ *md = c.headerMD
+ })
+}
+
+// Trailer returns a CallOptions that retrieves the trailer metadata
+// for a unary RPC.
+func Trailer(md *metadata.MD) CallOption {
+ return afterCall(func(c *callInfo) {
+ *md = c.trailerMD
+ })
+}
+
+// FailFast configures the action to take when an RPC is attempted on broken
+// connections or unreachable servers. If failfast is true, 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. Please refer to
+// https://github.com/grpc/grpc/blob/master/doc/fail_fast.md
+func FailFast(failFast bool) CallOption {
+ return beforeCall(func(c *callInfo) error {
+ c.failFast = failFast
+ return nil
+ })
+}
+
+// The format of the payload: compressed or not?
+type payloadFormat uint8
+
+const (
+ compressionNone payloadFormat = iota // no compression
+ compressionMade
+)
+
+// 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 http://www.grpc.io/docs/guides/wire.html.
+ 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
+// * of type transport.StreamError
+// 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(maxMsgSize int) (pf payloadFormat, msg []byte, err error) {
+ if _, err := io.ReadFull(p.r, 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 length > uint32(maxMsgSize) {
+ return 0, nil, Errorf(codes.Internal, "grpc: received message length %d exceeding the max size %d", length, maxMsgSize)
+ }
+ // TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
+ // of making it for each message:
+ msg = make([]byte, int(length))
+ if _, err := io.ReadFull(p.r, msg); err != nil {
+ if err == io.EOF {
+ err = io.ErrUnexpectedEOF
+ }
+ return 0, nil, err
+ }
+ return pf, msg, nil
+}
+
+// encode serializes msg and prepends the message header. If msg is nil, it
+// generates the message header of 0 message length.
+func encode(c Codec, msg interface{}, cp Compressor, cbuf *bytes.Buffer) ([]byte, error) {
+ var b []byte
+ var length uint
+ if msg != nil {
+ var err error
+ // TODO(zhaoq): optimize to reduce memory alloc and copying.
+ b, err = c.Marshal(msg)
+ if err != nil {
+ return nil, err
+ }
+ if cp != nil {
+ if err := cp.Do(cbuf, b); err != nil {
+ return nil, err
+ }
+ b = cbuf.Bytes()
+ }
+ length = uint(len(b))
+ }
+ if length > math.MaxUint32 {
+ return nil, Errorf(codes.InvalidArgument, "grpc: message too large (%d bytes)", length)
+ }
+
+ const (
+ payloadLen = 1
+ sizeLen = 4
+ )
+
+ var buf = make([]byte, payloadLen+sizeLen+len(b))
+
+ // Write payload format
+ if cp == nil {
+ buf[0] = byte(compressionNone)
+ } else {
+ buf[0] = byte(compressionMade)
+ }
+ // Write length of b into buf
+ binary.BigEndian.PutUint32(buf[1:], uint32(length))
+ // Copy encoded msg to buf
+ copy(buf[5:], b)
+
+ return buf, nil
+}
+
+func checkRecvPayload(pf payloadFormat, recvCompress string, dc Decompressor) error {
+ switch pf {
+ case compressionNone:
+ case compressionMade:
+ if dc == nil || recvCompress != dc.Type() {
+ return Errorf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
+ }
+ default:
+ return Errorf(codes.Internal, "grpc: received unexpected payload format %d", pf)
+ }
+ return nil
+}
+
+func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}, maxMsgSize int) error {
+ pf, d, err := p.recvMsg(maxMsgSize)
+ if err != nil {
+ return err
+ }
+ if err := checkRecvPayload(pf, s.RecvCompress(), dc); err != nil {
+ return err
+ }
+ if pf == compressionMade {
+ d, err = dc.Do(bytes.NewReader(d))
+ if err != nil {
+ return Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
+ }
+ }
+ if len(d) > maxMsgSize {
+ // TODO: Revisit the error code. Currently keep it consistent with java
+ // implementation.
+ return Errorf(codes.Internal, "grpc: received a message of %d bytes exceeding %d limit", len(d), maxMsgSize)
+ }
+ if err := c.Unmarshal(d, m); err != nil {
+ return Errorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
+ }
+ return nil
+}
+
+// rpcError defines the status from an RPC.
+type rpcError struct {
+ code codes.Code
+ desc string
+}
+
+func (e *rpcError) Error() string {
+ return fmt.Sprintf("rpc error: code = %d desc = %s", e.code, e.desc)
+}
+
+// Code returns the error code for err if it was produced by the rpc system.
+// Otherwise, it returns codes.Unknown.
+func Code(err error) codes.Code {
+ if err == nil {
+ return codes.OK
+ }
+ if e, ok := err.(*rpcError); ok {
+ return e.code
+ }
+ return codes.Unknown
+}
+
+// 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.
+func ErrorDesc(err error) string {
+ if err == nil {
+ return ""
+ }
+ if e, ok := err.(*rpcError); ok {
+ return e.desc
+ }
+ return err.Error()
+}
+
+// Errorf returns an error containing an error code and a description;
+// Errorf returns nil if c is OK.
+func Errorf(c codes.Code, format string, a ...interface{}) error {
+ if c == codes.OK {
+ return nil
+ }
+ return &rpcError{
+ code: c,
+ desc: fmt.Sprintf(format, a...),
+ }
+}
+
+// toRPCErr converts an error into a rpcError.
+func toRPCErr(err error) error {
+ switch e := err.(type) {
+ case *rpcError:
+ return err
+ case transport.StreamError:
+ return &rpcError{
+ code: e.Code,
+ desc: e.Desc,
+ }
+ case transport.ConnectionError:
+ return &rpcError{
+ code: codes.Internal,
+ desc: e.Desc,
+ }
+ default:
+ switch err {
+ case context.DeadlineExceeded:
+ return &rpcError{
+ code: codes.DeadlineExceeded,
+ desc: err.Error(),
+ }
+ case context.Canceled:
+ return &rpcError{
+ code: codes.Canceled,
+ desc: err.Error(),
+ }
+ case ErrClientConnClosing:
+ return &rpcError{
+ code: codes.FailedPrecondition,
+ desc: err.Error(),
+ }
+ }
+
+ }
+ return Errorf(codes.Unknown, "%v", err)
+}
+
+// convertCode converts a standard Go error into its canonical code. Note that
+// this is only used to translate the error returned by the server applications.
+func convertCode(err error) codes.Code {
+ switch err {
+ case nil:
+ return codes.OK
+ case io.EOF:
+ return codes.OutOfRange
+ case io.ErrClosedPipe, io.ErrNoProgress, io.ErrShortBuffer, io.ErrShortWrite, io.ErrUnexpectedEOF:
+ return codes.FailedPrecondition
+ case os.ErrInvalid:
+ return codes.InvalidArgument
+ case context.Canceled:
+ return codes.Canceled
+ case context.DeadlineExceeded:
+ return codes.DeadlineExceeded
+ }
+ switch {
+ case os.IsExist(err):
+ return codes.AlreadyExists
+ case os.IsNotExist(err):
+ return codes.NotFound
+ case os.IsPermission(err):
+ return codes.PermissionDenied
+ }
+ return codes.Unknown
+}
+
+// SupportPackageIsVersion4 is referenced from generated protocol buffer files
+// to assert that that code is compatible with this version of the grpc package.
+//
+// This constant may be renamed in the future if a change in the generated code
+// requires a synchronised update of grpc-go and protoc-gen-go. This constant
+// should not be referenced from any other code.
+const SupportPackageIsVersion4 = true
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
new file mode 100644
index 000000000..e0bb187ef
--- /dev/null
+++ b/vendor/google.golang.org/grpc/server.go
@@ -0,0 +1,944 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "bytes"
+ "errors"
+ "fmt"
+ "io"
+ "net"
+ "net/http"
+ "reflect"
+ "runtime"
+ "strings"
+ "sync"
+ "time"
+
+ "golang.org/x/net/context"
+ "golang.org/x/net/http2"
+ "golang.org/x/net/trace"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/internal"
+ "google.golang.org/grpc/metadata"
+ "google.golang.org/grpc/transport"
+)
+
+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 options
+
+ mu sync.Mutex // guards following
+ lis map[net.Listener]bool
+ conns map[io.Closer]bool
+ drain bool
+ ctx context.Context
+ cancel context.CancelFunc
+ // A CondVar to let GracefulStop() blocks until all the pending RPCs are finished
+ // and all the transport goes away.
+ cv *sync.Cond
+ m map[string]*service // service name -> service info
+ events trace.EventLog
+}
+
+type options struct {
+ creds credentials.TransportCredentials
+ codec Codec
+ cp Compressor
+ dc Decompressor
+ maxMsgSize int
+ unaryInt UnaryServerInterceptor
+ streamInt StreamServerInterceptor
+ maxConcurrentStreams uint32
+ useHandlerImpl bool // use http.Handler-based server
+}
+
+var defaultMaxMsgSize = 1024 * 1024 * 4 // use 4MB as the default message size limit
+
+// A ServerOption sets options.
+type ServerOption func(*options)
+
+// CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.
+func CustomCodec(codec Codec) ServerOption {
+ return func(o *options) {
+ o.codec = codec
+ }
+}
+
+// RPCCompressor returns a ServerOption that sets a compressor for outbound messages.
+func RPCCompressor(cp Compressor) ServerOption {
+ return func(o *options) {
+ o.cp = cp
+ }
+}
+
+// RPCDecompressor returns a ServerOption that sets a decompressor for inbound messages.
+func RPCDecompressor(dc Decompressor) ServerOption {
+ return func(o *options) {
+ o.dc = dc
+ }
+}
+
+// MaxMsgSize returns a ServerOption to set the max message size in bytes for inbound mesages.
+// If this is not set, gRPC uses the default 4MB.
+func MaxMsgSize(m int) ServerOption {
+ return func(o *options) {
+ o.maxMsgSize = 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 func(o *options) {
+ o.maxConcurrentStreams = n
+ }
+}
+
+// Creds returns a ServerOption that sets credentials for server connections.
+func Creds(c credentials.TransportCredentials) ServerOption {
+ return func(o *options) {
+ 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 func(o *options) {
+ if o.unaryInt != nil {
+ panic("The unary server interceptor has been set.")
+ }
+ 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 func(o *options) {
+ if o.streamInt != nil {
+ panic("The stream server interceptor has been set.")
+ }
+ o.streamInt = i
+ }
+}
+
+// NewServer creates a gRPC server which has no service registered and has not
+// started to accept requests yet.
+func NewServer(opt ...ServerOption) *Server {
+ var opts options
+ opts.maxMsgSize = defaultMaxMsgSize
+ for _, o := range opt {
+ o(&opts)
+ }
+ if opts.codec == nil {
+ // Set the default codec.
+ opts.codec = protoCodec{}
+ }
+ s := &Server{
+ lis: make(map[net.Listener]bool),
+ opts: opts,
+ conns: make(map[io.Closer]bool),
+ m: make(map[string]*service),
+ }
+ s.cv = sync.NewCond(&s.mu)
+ s.ctx, s.cancel = context.WithCancel(context.Background())
+ if EnableTracing {
+ _, file, line, _ := runtime.Caller(1)
+ s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
+ }
+ 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 register a service and its implementation to the gRPC
+// server. 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 _, 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 methid 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
+}
+
+var (
+ // ErrServerStopped indicates that the operation is now illegal because of
+ // the server being stopped.
+ 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)
+}
+
+// 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.
+func (s *Server) Serve(lis net.Listener) error {
+ s.mu.Lock()
+ s.printf("serving")
+ if s.lis == nil {
+ s.mu.Unlock()
+ lis.Close()
+ return ErrServerStopped
+ }
+ s.lis[lis] = true
+ s.mu.Unlock()
+ defer func() {
+ s.mu.Lock()
+ if s.lis != nil && s.lis[lis] {
+ lis.Close()
+ delete(s.lis, lis)
+ }
+ 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()
+ select {
+ case <-time.After(tempDelay):
+ case <-s.ctx.Done():
+ }
+ continue
+ }
+ s.mu.Lock()
+ s.printf("done serving; Accept = %v", err)
+ s.mu.Unlock()
+ return err
+ }
+ tempDelay = 0
+ // Start a new goroutine to deal with rawConn
+ // so we don't stall this Accept loop goroutine.
+ go s.handleRawConn(rawConn)
+ }
+}
+
+// handleRawConn is run in its own goroutine and handles a just-accepted
+// connection that has not had any I/O performed on it yet.
+func (s *Server) handleRawConn(rawConn net.Conn) {
+ conn, authInfo, err := s.useTransportAuthenticator(rawConn)
+ if err != nil {
+ s.mu.Lock()
+ s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
+ s.mu.Unlock()
+ grpclog.Printf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
+ // If serverHandShake returns ErrConnDispatched, keep rawConn open.
+ if err != credentials.ErrConnDispatched {
+ rawConn.Close()
+ }
+ return
+ }
+
+ s.mu.Lock()
+ if s.conns == nil {
+ s.mu.Unlock()
+ conn.Close()
+ return
+ }
+ s.mu.Unlock()
+
+ if s.opts.useHandlerImpl {
+ s.serveUsingHandler(conn)
+ } else {
+ s.serveNewHTTP2Transport(conn, authInfo)
+ }
+}
+
+// serveNewHTTP2Transport sets up a new http/2 transport (using the
+// gRPC http2 server transport in transport/http2_server.go) and
+// serves streams on it.
+// This is run in its own goroutine (it does network I/O in
+// transport.NewServerTransport).
+func (s *Server) serveNewHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) {
+ st, err := transport.NewServerTransport("http2", c, s.opts.maxConcurrentStreams, authInfo)
+ if err != nil {
+ s.mu.Lock()
+ s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
+ s.mu.Unlock()
+ c.Close()
+ grpclog.Println("grpc: Server.Serve failed to create ServerTransport: ", err)
+ return
+ }
+ if !s.addConn(st) {
+ st.Close()
+ return
+ }
+ s.serveStreams(st)
+}
+
+func (s *Server) serveStreams(st transport.ServerTransport) {
+ defer s.removeConn(st)
+ 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))
+ }()
+ })
+ wg.Wait()
+}
+
+var _ http.Handler = (*Server)(nil)
+
+// serveUsingHandler is called from handleRawConn when s is configured
+// to handle requests via the http.Handler interface. It sets up a
+// net/http.Server to handle the just-accepted conn. The http.Server
+// is configured to route all incoming requests (all HTTP/2 streams)
+// to ServeHTTP, which creates a new ServerTransport for each stream.
+// serveUsingHandler blocks until conn closes.
+//
+// This codepath is only used when Server.TestingUseHandlerImpl has
+// been configured. This lets the end2end tests exercise the ServeHTTP
+// method as one of the environment types.
+//
+// conn is the *tls.Conn that's already been authenticated.
+func (s *Server) serveUsingHandler(conn net.Conn) {
+ if !s.addConn(conn) {
+ conn.Close()
+ return
+ }
+ defer s.removeConn(conn)
+ h2s := &http2.Server{
+ MaxConcurrentStreams: s.opts.maxConcurrentStreams,
+ }
+ h2s.ServeConn(conn, &http2.ServeConnOpts{
+ Handler: s,
+ })
+}
+
+func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ st, err := transport.NewServerHandlerTransport(w, r)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusInternalServerError)
+ return
+ }
+ if !s.addConn(st) {
+ st.Close()
+ 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
+ }
+ trInfo = &traceInfo{
+ tr: trace.New("grpc.Recv."+methodFamily(stream.Method()), stream.Method()),
+ }
+ trInfo.firstLine.client = false
+ trInfo.firstLine.remoteAddr = st.RemoteAddr()
+ stream.TraceContext(trInfo.tr)
+ if dl, ok := stream.Context().Deadline(); ok {
+ trInfo.firstLine.deadline = dl.Sub(time.Now())
+ }
+ return trInfo
+}
+
+func (s *Server) addConn(c io.Closer) bool {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.conns == nil || s.drain {
+ return false
+ }
+ s.conns[c] = true
+ return true
+}
+
+func (s *Server) removeConn(c io.Closer) {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.conns != nil {
+ delete(s.conns, c)
+ s.cv.Broadcast()
+ }
+}
+
+func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options) error {
+ var cbuf *bytes.Buffer
+ if cp != nil {
+ cbuf = new(bytes.Buffer)
+ }
+ p, err := encode(s.opts.codec, msg, cp, cbuf)
+ if err != nil {
+ // This typically indicates a fatal issue (e.g., memory
+ // corruption or hardware faults) the application program
+ // cannot handle.
+ //
+ // TODO(zhaoq): There exist other options also such as only closing the
+ // faulty stream locally and remotely (Other streams can keep going). Find
+ // the optimal option.
+ grpclog.Fatalf("grpc: Server failed to encode response %v", err)
+ }
+ return t.Write(stream, p, opts)
+}
+
+func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, trInfo *traceInfo) (err error) {
+ if trInfo != nil {
+ defer trInfo.tr.Finish()
+ trInfo.firstLine.client = false
+ 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()
+ }
+ }()
+ }
+ if s.opts.cp != nil {
+ // NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
+ stream.SetSendCompress(s.opts.cp.Type())
+ }
+ p := &parser{r: stream}
+ for {
+ pf, req, err := p.recvMsg(s.opts.maxMsgSize)
+ if err == io.EOF {
+ // The entire stream is done (for unary RPC only).
+ return err
+ }
+ if err == io.ErrUnexpectedEOF {
+ err = Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
+ }
+ if err != nil {
+ switch err := err.(type) {
+ case *rpcError:
+ if err := t.WriteStatus(stream, err.code, err.desc); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+ }
+ case transport.ConnectionError:
+ // Nothing to do here.
+ case transport.StreamError:
+ if err := t.WriteStatus(stream, err.Code, err.Desc); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+ }
+ default:
+ panic(fmt.Sprintf("grpc: Unexpected error (%T) from recvMsg: %v", err, err))
+ }
+ return err
+ }
+
+ if err := checkRecvPayload(pf, stream.RecvCompress(), s.opts.dc); err != nil {
+ switch err := err.(type) {
+ case *rpcError:
+ if err := t.WriteStatus(stream, err.code, err.desc); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+ }
+ default:
+ if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+ }
+
+ }
+ return err
+ }
+ statusCode := codes.OK
+ statusDesc := ""
+ df := func(v interface{}) error {
+ if pf == compressionMade {
+ var err error
+ req, err = s.opts.dc.Do(bytes.NewReader(req))
+ if err != nil {
+ if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
+ }
+ return err
+ }
+ }
+ if len(req) > s.opts.maxMsgSize {
+ // TODO: Revisit the error code. Currently keep it consistent with
+ // java implementation.
+ statusCode = codes.Internal
+ statusDesc = fmt.Sprintf("grpc: server received a message of %d bytes exceeding %d limit", len(req), s.opts.maxMsgSize)
+ }
+ if err := s.opts.codec.Unmarshal(req, v); err != nil {
+ return err
+ }
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
+ }
+ return nil
+ }
+ reply, appErr := md.Handler(srv.server, stream.Context(), df, s.opts.unaryInt)
+ if appErr != nil {
+ if err, ok := appErr.(*rpcError); ok {
+ statusCode = err.code
+ statusDesc = err.desc
+ } else {
+ statusCode = convertCode(appErr)
+ statusDesc = appErr.Error()
+ }
+ if trInfo != nil && statusCode != codes.OK {
+ trInfo.tr.LazyLog(stringer(statusDesc), true)
+ trInfo.tr.SetError()
+ }
+ if err := t.WriteStatus(stream, statusCode, statusDesc); err != nil {
+ grpclog.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
+ return err
+ }
+ return nil
+ }
+ if trInfo != nil {
+ trInfo.tr.LazyLog(stringer("OK"), false)
+ }
+ opts := &transport.Options{
+ Last: true,
+ Delay: false,
+ }
+ if err := s.sendResponse(t, stream, reply, s.opts.cp, opts); err != nil {
+ switch err := err.(type) {
+ case transport.ConnectionError:
+ // Nothing to do here.
+ case transport.StreamError:
+ statusCode = err.Code
+ statusDesc = err.Desc
+ default:
+ statusCode = codes.Unknown
+ statusDesc = err.Error()
+ }
+ return err
+ }
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
+ }
+ return t.WriteStatus(stream, statusCode, statusDesc)
+ }
+}
+
+func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
+ if s.opts.cp != nil {
+ stream.SetSendCompress(s.opts.cp.Type())
+ }
+ ss := &serverStream{
+ t: t,
+ s: stream,
+ p: &parser{r: stream},
+ codec: s.opts.codec,
+ cp: s.opts.cp,
+ dc: s.opts.dc,
+ maxMsgSize: s.opts.maxMsgSize,
+ trInfo: trInfo,
+ }
+ if ss.cp != nil {
+ ss.cbuf = new(bytes.Buffer)
+ }
+ 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
+ if s.opts.streamInt == nil {
+ appErr = sd.Handler(srv.server, ss)
+ } else {
+ info := &StreamServerInfo{
+ FullMethod: stream.Method(),
+ IsClientStream: sd.ClientStreams,
+ IsServerStream: sd.ServerStreams,
+ }
+ appErr = s.opts.streamInt(srv.server, ss, info, sd.Handler)
+ }
+ if appErr != nil {
+ if err, ok := appErr.(*rpcError); ok {
+ ss.statusCode = err.code
+ ss.statusDesc = err.desc
+ } else if err, ok := appErr.(transport.StreamError); ok {
+ ss.statusCode = err.Code
+ ss.statusDesc = err.Desc
+ } else {
+ ss.statusCode = convertCode(appErr)
+ ss.statusDesc = appErr.Error()
+ }
+ }
+ if trInfo != nil {
+ ss.mu.Lock()
+ if ss.statusCode != codes.OK {
+ ss.trInfo.tr.LazyLog(stringer(ss.statusDesc), true)
+ ss.trInfo.tr.SetError()
+ } else {
+ ss.trInfo.tr.LazyLog(stringer("OK"), false)
+ }
+ ss.mu.Unlock()
+ }
+ return t.WriteStatus(ss.s, ss.statusCode, ss.statusDesc)
+
+}
+
+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()
+ }
+ if err := t.WriteStatus(stream, codes.InvalidArgument, fmt.Sprintf("malformed method name: %q", stream.Method())); err != nil {
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+ trInfo.tr.SetError()
+ }
+ grpclog.Printf("grpc: Server.handleStream failed to write status: %v", err)
+ }
+ if trInfo != nil {
+ trInfo.tr.Finish()
+ }
+ return
+ }
+ service := sm[:pos]
+ method := sm[pos+1:]
+ srv, ok := s.m[service]
+ if !ok {
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&fmtStringer{"Unknown service %v", []interface{}{service}}, true)
+ trInfo.tr.SetError()
+ }
+ if err := t.WriteStatus(stream, codes.Unimplemented, fmt.Sprintf("unknown service %v", service)); err != nil {
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+ trInfo.tr.SetError()
+ }
+ grpclog.Printf("grpc: Server.handleStream failed to write status: %v", err)
+ }
+ if trInfo != nil {
+ trInfo.tr.Finish()
+ }
+ return
+ }
+ // Unary RPC or Streaming RPC?
+ 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
+ }
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&fmtStringer{"Unknown method %v", []interface{}{method}}, true)
+ trInfo.tr.SetError()
+ }
+ if err := t.WriteStatus(stream, codes.Unimplemented, fmt.Sprintf("unknown method %v", method)); err != nil {
+ if trInfo != nil {
+ trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+ trInfo.tr.SetError()
+ }
+ grpclog.Printf("grpc: Server.handleStream failed to write status: %v", err)
+ }
+ if trInfo != nil {
+ trInfo.tr.Finish()
+ }
+}
+
+// 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.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()
+ s.cancel()
+ if s.events != nil {
+ s.events.Finish()
+ s.events = nil
+ }
+ s.mu.Unlock()
+}
+
+// GracefulStop stops the gRPC server gracefully. It stops the server to accept new
+// connections and RPCs and blocks until all the pending RPCs are finished.
+func (s *Server) GracefulStop() {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.conns == nil {
+ return
+ }
+ for lis := range s.lis {
+ lis.Close()
+ }
+ s.lis = nil
+ s.cancel()
+ if !s.drain {
+ for c := range s.conns {
+ c.(transport.ServerTransport).Drain()
+ }
+ s.drain = true
+ }
+ for len(s.conns) != 0 {
+ s.cv.Wait()
+ }
+ s.conns = nil
+ if s.events != nil {
+ s.events.Finish()
+ s.events = nil
+ }
+}
+
+func init() {
+ internal.TestingCloseConns = func(arg interface{}) {
+ arg.(*Server).testingCloseConns()
+ }
+ internal.TestingUseHandlerImpl = func(arg interface{}) {
+ arg.(*Server).opts.useHandlerImpl = true
+ }
+}
+
+// testingCloseConns closes all existing transports but keeps s.lis
+// accepting new connections.
+func (s *Server) testingCloseConns() {
+ s.mu.Lock()
+ for c := range s.conns {
+ c.Close()
+ delete(s.conns, c)
+ }
+ s.mu.Unlock()
+}
+
+// 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, ok := transport.StreamFromContext(ctx)
+ if !ok {
+ return 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, ok := transport.StreamFromContext(ctx)
+ if !ok {
+ return Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
+ }
+ t := stream.ServerTransport()
+ if t == nil {
+ grpclog.Fatalf("grpc: SendHeader: %v has no ServerTransport to send header metadata.", stream)
+ }
+ if err := t.WriteHeader(stream, 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, ok := transport.StreamFromContext(ctx)
+ if !ok {
+ return Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
+ }
+ return stream.SetTrailer(md)
+}
diff --git a/vendor/google.golang.org/grpc/stream.go b/vendor/google.golang.org/grpc/stream.go
new file mode 100644
index 000000000..46810544f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/stream.go
@@ -0,0 +1,526 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "bytes"
+ "errors"
+ "io"
+ "math"
+ "sync"
+ "time"
+
+ "golang.org/x/net/context"
+ "golang.org/x/net/trace"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/metadata"
+ "google.golang.org/grpc/transport"
+)
+
+// StreamHandler defines the handler called by gRPC server to complete the
+// execution of a streaming 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.
+type Stream interface {
+ // Context returns the context for this stream.
+ Context() context.Context
+ // SendMsg blocks until it sends m, the stream is done or the stream
+ // breaks.
+ // On error, it aborts the stream and returns an RPC status on client
+ // side. On server side, it simply returns the error to the caller.
+ // SendMsg is called by generated code. Also Users can call SendMsg
+ // directly when it is really needed in their use cases.
+ SendMsg(m interface{}) error
+ // RecvMsg blocks until it receives a message or the stream is
+ // done. On client side, it returns io.EOF when the stream is done. On
+ // any other error, it aborts the stream and returns an RPC status. On
+ // server side, it simply returns the error to the caller.
+ RecvMsg(m interface{}) error
+}
+
+// ClientStream defines the interface a client stream has to satisfy.
+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.
+ CloseSend() error
+ Stream
+}
+
+// NewClientStream creates a new Stream for the client side. This is called
+// by generated code.
+func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error) {
+ if cc.dopts.streamInt != nil {
+ return cc.dopts.streamInt(ctx, desc, cc, method, newClientStream, opts...)
+ }
+ return newClientStream(ctx, desc, cc, method, opts...)
+}
+
+func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
+ var (
+ t transport.ClientTransport
+ s *transport.Stream
+ put func()
+ )
+ c := defaultCallInfo
+ for _, o := range opts {
+ if err := o.before(&c); err != nil {
+ return nil, toRPCErr(err)
+ }
+ }
+ callHdr := &transport.CallHdr{
+ Host: cc.authority,
+ Method: method,
+ Flush: desc.ServerStreams && desc.ClientStreams,
+ }
+ if cc.dopts.cp != nil {
+ callHdr.SendCompress = cc.dopts.cp.Type()
+ }
+ var trInfo traceInfo
+ if EnableTracing {
+ trInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
+ trInfo.firstLine.client = true
+ if deadline, ok := ctx.Deadline(); ok {
+ trInfo.firstLine.deadline = deadline.Sub(time.Now())
+ }
+ trInfo.tr.LazyLog(&trInfo.firstLine, false)
+ ctx = trace.NewContext(ctx, trInfo.tr)
+ defer func() {
+ if err != nil {
+ // Need to call tr.finish() if error is returned.
+ // Because tr will not be returned to caller.
+ trInfo.tr.LazyPrintf("RPC: [%v]", err)
+ trInfo.tr.SetError()
+ trInfo.tr.Finish()
+ }
+ }()
+ }
+ gopts := BalancerGetOptions{
+ BlockingWait: !c.failFast,
+ }
+ for {
+ t, put, err = cc.getTransport(ctx, gopts)
+ if err != nil {
+ // TODO(zhaoq): Probably revisit the error handling.
+ if _, ok := err.(*rpcError); ok {
+ return nil, err
+ }
+ if err == errConnClosing || err == errConnUnavailable {
+ if c.failFast {
+ return nil, Errorf(codes.Unavailable, "%v", err)
+ }
+ continue
+ }
+ // All the other errors are treated as Internal errors.
+ return nil, Errorf(codes.Internal, "%v", err)
+ }
+
+ s, err = t.NewStream(ctx, callHdr)
+ if err != nil {
+ if put != nil {
+ put()
+ put = nil
+ }
+ if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
+ if c.failFast {
+ return nil, toRPCErr(err)
+ }
+ continue
+ }
+ return nil, toRPCErr(err)
+ }
+ break
+ }
+ cs := &clientStream{
+ opts: opts,
+ c: c,
+ desc: desc,
+ codec: cc.dopts.codec,
+ cp: cc.dopts.cp,
+ dc: cc.dopts.dc,
+
+ put: put,
+ t: t,
+ s: s,
+ p: &parser{r: s},
+
+ tracing: EnableTracing,
+ trInfo: trInfo,
+ }
+ if cc.dopts.cp != nil {
+ cs.cbuf = new(bytes.Buffer)
+ }
+ // Listen on ctx.Done() to detect cancellation and s.Done() to detect normal termination
+ // when there is no pending I/O operations on this stream.
+ go func() {
+ select {
+ case <-t.Error():
+ // Incur transport error, simply exit.
+ case <-s.Done():
+ // TODO: The trace of the RPC is terminated here when there is no pending
+ // I/O, which is probably not the optimal solution.
+ if s.StatusCode() == codes.OK {
+ cs.finish(nil)
+ } else {
+ cs.finish(Errorf(s.StatusCode(), "%s", s.StatusDesc()))
+ }
+ cs.closeTransportStream(nil)
+ case <-s.GoAway():
+ cs.finish(errConnDrain)
+ cs.closeTransportStream(errConnDrain)
+ case <-s.Context().Done():
+ err := s.Context().Err()
+ cs.finish(err)
+ cs.closeTransportStream(transport.ContextErr(err))
+ }
+ }()
+ return cs, nil
+}
+
+// clientStream implements a client side Stream.
+type clientStream struct {
+ opts []CallOption
+ c callInfo
+ t transport.ClientTransport
+ s *transport.Stream
+ p *parser
+ desc *StreamDesc
+ codec Codec
+ cp Compressor
+ cbuf *bytes.Buffer
+ dc Decompressor
+
+ tracing bool // set to EnableTracing when the clientStream is created.
+
+ mu sync.Mutex
+ put func()
+ closed bool
+ // trInfo.tr is set when the clientStream is created (if EnableTracing is true),
+ // and is set to nil when the clientStream's finish method is called.
+ trInfo traceInfo
+}
+
+func (cs *clientStream) Context() context.Context {
+ return cs.s.Context()
+}
+
+func (cs *clientStream) Header() (metadata.MD, error) {
+ m, err := cs.s.Header()
+ if err != nil {
+ if _, ok := err.(transport.ConnectionError); !ok {
+ cs.closeTransportStream(err)
+ }
+ }
+ return m, err
+}
+
+func (cs *clientStream) Trailer() metadata.MD {
+ return cs.s.Trailer()
+}
+
+func (cs *clientStream) SendMsg(m interface{}) (err error) {
+ if cs.tracing {
+ cs.mu.Lock()
+ if cs.trInfo.tr != nil {
+ cs.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
+ }
+ cs.mu.Unlock()
+ }
+ defer func() {
+ if err != nil {
+ cs.finish(err)
+ }
+ if err == nil {
+ return
+ }
+ if err == io.EOF {
+ // Specialize the process for server streaming. SendMesg is only called
+ // once when creating the stream object. io.EOF needs to be skipped when
+ // the rpc is early finished (before the stream object is created.).
+ // TODO: It is probably better to move this into the generated code.
+ if !cs.desc.ClientStreams && cs.desc.ServerStreams {
+ err = nil
+ }
+ return
+ }
+ if _, ok := err.(transport.ConnectionError); !ok {
+ cs.closeTransportStream(err)
+ }
+ err = toRPCErr(err)
+ }()
+ out, err := encode(cs.codec, m, cs.cp, cs.cbuf)
+ defer func() {
+ if cs.cbuf != nil {
+ cs.cbuf.Reset()
+ }
+ }()
+ if err != nil {
+ return Errorf(codes.Internal, "grpc: %v", err)
+ }
+ return cs.t.Write(cs.s, out, &transport.Options{Last: false})
+}
+
+func (cs *clientStream) RecvMsg(m interface{}) (err error) {
+ err = recv(cs.p, cs.codec, cs.s, cs.dc, m, math.MaxInt32)
+ defer func() {
+ // err != nil indicates the termination of the stream.
+ if err != nil {
+ cs.finish(err)
+ }
+ }()
+ if err == nil {
+ if cs.tracing {
+ cs.mu.Lock()
+ if cs.trInfo.tr != nil {
+ cs.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
+ }
+ cs.mu.Unlock()
+ }
+ if !cs.desc.ClientStreams || cs.desc.ServerStreams {
+ return
+ }
+ // Special handling for client streaming rpc.
+ err = recv(cs.p, cs.codec, cs.s, cs.dc, m, math.MaxInt32)
+ cs.closeTransportStream(err)
+ if err == nil {
+ return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
+ }
+ if err == io.EOF {
+ if cs.s.StatusCode() == codes.OK {
+ cs.finish(err)
+ return nil
+ }
+ return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
+ }
+ return toRPCErr(err)
+ }
+ if _, ok := err.(transport.ConnectionError); !ok {
+ cs.closeTransportStream(err)
+ }
+ if err == io.EOF {
+ if cs.s.StatusCode() == codes.OK {
+ // Returns io.EOF to indicate the end of the stream.
+ return
+ }
+ return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
+ }
+ return toRPCErr(err)
+}
+
+func (cs *clientStream) CloseSend() (err error) {
+ err = cs.t.Write(cs.s, nil, &transport.Options{Last: true})
+ defer func() {
+ if err != nil {
+ cs.finish(err)
+ }
+ }()
+ if err == nil || err == io.EOF {
+ return nil
+ }
+ if _, ok := err.(transport.ConnectionError); !ok {
+ cs.closeTransportStream(err)
+ }
+ err = toRPCErr(err)
+ return
+}
+
+func (cs *clientStream) closeTransportStream(err error) {
+ cs.mu.Lock()
+ if cs.closed {
+ cs.mu.Unlock()
+ return
+ }
+ cs.closed = true
+ cs.mu.Unlock()
+ cs.t.CloseStream(cs.s, err)
+}
+
+func (cs *clientStream) finish(err error) {
+ cs.mu.Lock()
+ defer cs.mu.Unlock()
+ for _, o := range cs.opts {
+ o.after(&cs.c)
+ }
+ if cs.put != nil {
+ cs.put()
+ cs.put = nil
+ }
+ if !cs.tracing {
+ return
+ }
+ if cs.trInfo.tr != nil {
+ if err == nil || err == io.EOF {
+ cs.trInfo.tr.LazyPrintf("RPC: [OK]")
+ } else {
+ cs.trInfo.tr.LazyPrintf("RPC: [%v]", err)
+ cs.trInfo.tr.SetError()
+ }
+ cs.trInfo.tr.Finish()
+ cs.trInfo.tr = nil
+ }
+}
+
+// ServerStream defines the interface a server stream has to satisfy.
+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)
+ Stream
+}
+
+// serverStream implements a server side Stream.
+type serverStream struct {
+ t transport.ServerTransport
+ s *transport.Stream
+ p *parser
+ codec Codec
+ cp Compressor
+ dc Decompressor
+ cbuf *bytes.Buffer
+ maxMsgSize int
+ statusCode codes.Code
+ statusDesc string
+ trInfo *traceInfo
+
+ mu sync.Mutex // protects trInfo.tr after the service handler runs.
+}
+
+func (ss *serverStream) Context() context.Context {
+ return ss.s.Context()
+}
+
+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 {
+ return ss.t.WriteHeader(ss.s, md)
+}
+
+func (ss *serverStream) SetTrailer(md metadata.MD) {
+ if md.Len() == 0 {
+ return
+ }
+ ss.s.SetTrailer(md)
+ return
+}
+
+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()
+ }
+ }()
+ out, err := encode(ss.codec, m, ss.cp, ss.cbuf)
+ defer func() {
+ if ss.cbuf != nil {
+ ss.cbuf.Reset()
+ }
+ }()
+ if err != nil {
+ err = Errorf(codes.Internal, "grpc: %v", err)
+ return err
+ }
+ if err := ss.t.Write(ss.s, out, &transport.Options{Last: false}); err != nil {
+ return toRPCErr(err)
+ }
+ 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 := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxMsgSize); err != nil {
+ if err == io.EOF {
+ return err
+ }
+ if err == io.ErrUnexpectedEOF {
+ err = Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
+ }
+ return toRPCErr(err)
+ }
+ return nil
+}
diff --git a/vendor/google.golang.org/grpc/trace.go b/vendor/google.golang.org/grpc/trace.go
new file mode 100644
index 000000000..f6747e1df
--- /dev/null
+++ b/vendor/google.golang.org/grpc/trace.go
@@ -0,0 +1,119 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package grpc
+
+import (
+ "bytes"
+ "fmt"
+ "io"
+ "net"
+ "strings"
+ "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 = true
+
+// 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.
+type firstLine struct {
+ client bool // whether this is a client (outgoing) RPC
+ remoteAddr net.Addr
+ deadline time.Duration // may be zero
+}
+
+func (f *firstLine) String() string {
+ 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()
+}
+
+// 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 fmt.Sprintf("sent: %v", p.msg)
+ }
+ return fmt.Sprintf("recv: %v", p.msg)
+}
+
+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/transport/control.go b/vendor/google.golang.org/grpc/transport/control.go
new file mode 100644
index 000000000..4ef0830b5
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/control.go
@@ -0,0 +1,215 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "fmt"
+ "sync"
+
+ "golang.org/x/net/http2"
+)
+
+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
+ initialConnWindowSize = defaultWindowSize * 16 // for a connection
+)
+
+// 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.
+type windowUpdate struct {
+ streamID uint32
+ increment uint32
+}
+
+func (*windowUpdate) item() {}
+
+type settings struct {
+ ack bool
+ ss []http2.Setting
+}
+
+func (*settings) item() {}
+
+type resetStream struct {
+ streamID uint32
+ code http2.ErrCode
+}
+
+func (*resetStream) item() {}
+
+type goAway struct {
+}
+
+func (*goAway) item() {}
+
+type flushIO struct {
+}
+
+func (*flushIO) item() {}
+
+type ping struct {
+ ack bool
+ data [8]byte
+}
+
+func (*ping) item() {}
+
+// quotaPool is a pool which accumulates the quota and sends it to acquire()
+// when it is available.
+type quotaPool struct {
+ c chan int
+
+ mu sync.Mutex
+ quota int
+}
+
+// newQuotaPool creates a quotaPool which has quota q available to consume.
+func newQuotaPool(q int) *quotaPool {
+ qb := &quotaPool{
+ c: make(chan int, 1),
+ }
+ if q > 0 {
+ qb.c <- q
+ } else {
+ qb.quota = q
+ }
+ return qb
+}
+
+// add adds n to the available quota and tries to send it on acquire.
+func (qb *quotaPool) add(n int) {
+ qb.mu.Lock()
+ defer qb.mu.Unlock()
+ qb.quota += n
+ if qb.quota <= 0 {
+ return
+ }
+ select {
+ case qb.c <- qb.quota:
+ qb.quota = 0
+ default:
+ }
+}
+
+// cancel cancels the pending quota sent on acquire, if any.
+func (qb *quotaPool) cancel() {
+ qb.mu.Lock()
+ defer qb.mu.Unlock()
+ select {
+ case n := <-qb.c:
+ qb.quota += n
+ default:
+ }
+}
+
+// reset cancels the pending quota sent on acquired, incremented by v and sends
+// it back on acquire.
+func (qb *quotaPool) reset(v int) {
+ qb.mu.Lock()
+ defer qb.mu.Unlock()
+ select {
+ case n := <-qb.c:
+ qb.quota += n
+ default:
+ }
+ qb.quota += v
+ if qb.quota <= 0 {
+ return
+ }
+ select {
+ case qb.c <- qb.quota:
+ qb.quota = 0
+ default:
+ }
+}
+
+// acquire returns the channel on which available quota amounts are sent.
+func (qb *quotaPool) acquire() <-chan int {
+ return qb.c
+}
+
+// inFlow deals with inbound flow control
+type inFlow struct {
+ // The inbound flow control limit for pending data.
+ limit uint32
+
+ mu sync.Mutex
+ // 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
+}
+
+// onData is invoked when some data frame is received. It updates pendingData.
+func (f *inFlow) onData(n uint32) error {
+ f.mu.Lock()
+ defer f.mu.Unlock()
+ f.pendingData += n
+ if f.pendingData+f.pendingUpdate > f.limit {
+ return fmt.Errorf("received %d-bytes data exceeding the limit %d bytes", f.pendingData+f.pendingUpdate, f.limit)
+ }
+ 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()
+ defer f.mu.Unlock()
+ if f.pendingData == 0 {
+ return 0
+ }
+ f.pendingData -= n
+ f.pendingUpdate += n
+ if f.pendingUpdate >= f.limit/4 {
+ wu := f.pendingUpdate
+ f.pendingUpdate = 0
+ return wu
+ }
+ return 0
+}
+
+func (f *inFlow) resetPendingData() uint32 {
+ f.mu.Lock()
+ defer f.mu.Unlock()
+ n := f.pendingData
+ f.pendingData = 0
+ return n
+}
diff --git a/vendor/google.golang.org/grpc/transport/go16.go b/vendor/google.golang.org/grpc/transport/go16.go
new file mode 100644
index 000000000..ee1c46bad
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/go16.go
@@ -0,0 +1,46 @@
+// +build go1.6,!go1.7
+
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "net"
+
+ "golang.org/x/net/context"
+)
+
+// dialContext connects to the address on the named network.
+func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
+ return (&net.Dialer{Cancel: ctx.Done()}).Dial(network, address)
+}
diff --git a/vendor/google.golang.org/grpc/transport/go17.go b/vendor/google.golang.org/grpc/transport/go17.go
new file mode 100644
index 000000000..356f13ff1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/go17.go
@@ -0,0 +1,46 @@
+// +build go1.7
+
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "net"
+
+ "golang.org/x/net/context"
+)
+
+// dialContext connects to the address on the named network.
+func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
+ return (&net.Dialer{}).DialContext(ctx, network, address)
+}
diff --git a/vendor/google.golang.org/grpc/transport/handler_server.go b/vendor/google.golang.org/grpc/transport/handler_server.go
new file mode 100644
index 000000000..114e34906
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/handler_server.go
@@ -0,0 +1,397 @@
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// 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 (
+ "errors"
+ "fmt"
+ "io"
+ "net"
+ "net/http"
+ "strings"
+ "sync"
+ "time"
+
+ "golang.org/x/net/context"
+ "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"
+)
+
+// 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) (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")
+ }
+ if !validContentType(r.Header.Get("Content-Type")) {
+ 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")
+ }
+ if _, ok := w.(http.CloseNotifier); !ok {
+ return nil, errors.New("gRPC requires a ResponseWriter supporting http.CloseNotifier")
+ }
+
+ st := &serverHandlerTransport{
+ rw: w,
+ req: r,
+ closedCh: make(chan struct{}),
+ writes: make(chan func()),
+ }
+
+ if v := r.Header.Get("grpc-timeout"); v != "" {
+ to, err := decodeTimeout(v)
+ if err != nil {
+ return nil, streamErrorf(codes.Internal, "malformed time-out: %v", err)
+ }
+ st.timeoutSet = true
+ st.timeout = to
+ }
+
+ var metakv []string
+ if r.Host != "" {
+ metakv = append(metakv, ":authority", r.Host)
+ }
+ for k, vv := range r.Header {
+ k = strings.ToLower(k)
+ if isReservedHeader(k) && !isWhitelistedPseudoHeader(k) {
+ continue
+ }
+ for _, v := range vv {
+ if k == "user-agent" {
+ // user-agent is special. Copying logic of http_util.go.
+ if i := strings.LastIndex(v, " "); i == -1 {
+ // There is no application user agent string being set
+ continue
+ } else {
+ v = v[:i]
+ }
+ }
+ 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()
+}
+
+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.writes <- fn:
+ return nil
+ case <-ht.closedCh:
+ return ErrConnClosing
+ }
+}
+
+func (ht *serverHandlerTransport) WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error {
+ 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", statusCode))
+ if statusDesc != "" {
+ h.Set("Grpc-Message", encodeGrpcMessage(statusDesc))
+ }
+ 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, v)
+ }
+ }
+ }
+ })
+ close(ht.writes)
+ 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", "application/grpc")
+
+ // 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")
+
+ if s.sendCompress != "" {
+ h.Set("Grpc-Encoding", s.sendCompress)
+ }
+}
+
+func (ht *serverHandlerTransport) Write(s *Stream, data []byte, opts *Options) error {
+ return ht.do(func() {
+ ht.writeCommonHeaders(s)
+ ht.rw.Write(data)
+ if !opts.Delay {
+ ht.rw.(http.Flusher).Flush()
+ }
+ })
+}
+
+func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
+ return 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 {
+ h.Add(k, v)
+ }
+ }
+ ht.rw.WriteHeader(200)
+ ht.rw.(http.Flusher).Flush()
+ })
+}
+
+func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream)) {
+ // With this transport type there will be exactly 1 stream: this HTTP request.
+
+ var ctx context.Context
+ var cancel context.CancelFunc
+ if ht.timeoutSet {
+ ctx, cancel = context.WithTimeout(context.Background(), ht.timeout)
+ } else {
+ ctx, cancel = context.WithCancel(context.Background())
+ }
+
+ // requestOver is closed when either the request's context is done
+ // or the status has been written via WriteStatus.
+ requestOver := make(chan struct{})
+
+ // clientGone receives a single value if peer is gone, either
+ // because the underlying connection is dead or because the
+ // peer sends an http2 RST_STREAM.
+ clientGone := ht.rw.(http.CloseNotifier).CloseNotify()
+ go func() {
+ select {
+ case <-requestOver:
+ return
+ case <-ht.closedCh:
+ case <-clientGone:
+ }
+ cancel()
+ }()
+
+ req := ht.req
+
+ s := &Stream{
+ id: 0, // irrelevant
+ windowHandler: func(int) {}, // nothing
+ cancel: cancel,
+ buf: newRecvBuffer(),
+ st: ht,
+ method: req.URL.Path,
+ recvCompress: req.Header.Get("grpc-encoding"),
+ }
+ pr := &peer.Peer{
+ Addr: ht.RemoteAddr(),
+ }
+ if req.TLS != nil {
+ pr.AuthInfo = credentials.TLSInfo{State: *req.TLS}
+ }
+ ctx = metadata.NewContext(ctx, ht.headerMD)
+ ctx = peer.NewContext(ctx, pr)
+ s.ctx = newContextWithStream(ctx, s)
+ s.dec = &recvBufferReader{ctx: s.ctx, recv: s.buf}
+
+ // 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{data: 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, ok := <-ht.writes:
+ if !ok {
+ return
+ }
+ fn()
+ case <-ht.closedCh:
+ return
+ }
+ }
+}
+
+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
+// * of type transport.StreamError
+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 StreamError{
+ Code: code,
+ Desc: se.Error(),
+ }
+ }
+ }
+ return connectionErrorf(true, err, err.Error())
+}
diff --git a/vendor/google.golang.org/grpc/transport/http2_client.go b/vendor/google.golang.org/grpc/transport/http2_client.go
new file mode 100644
index 000000000..2b0f68016
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/http2_client.go
@@ -0,0 +1,1072 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "bytes"
+ "fmt"
+ "io"
+ "math"
+ "net"
+ "strings"
+ "sync"
+ "time"
+
+ "golang.org/x/net/context"
+ "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/grpclog"
+ "google.golang.org/grpc/metadata"
+ "google.golang.org/grpc/peer"
+)
+
+// http2Client implements the ClientTransport interface with HTTP2.
+type http2Client struct {
+ target string // server name/addr
+ userAgent string
+ md interface{}
+ conn net.Conn // underlying communication channel
+ authInfo credentials.AuthInfo // auth info about the connection
+ nextID uint32 // the next stream ID to be used
+
+ // writableChan synchronizes write access to the transport.
+ // A writer acquires the write lock by sending a value on writableChan
+ // and releases it by receiving from writableChan.
+ writableChan chan int
+ // shutdownChan is closed when Close is called.
+ // Blocking operations should select on shutdownChan to avoid
+ // blocking forever after Close.
+ // TODO(zhaoq): Maybe have a channel context?
+ shutdownChan chan struct{}
+ // errorChan is closed to notify the I/O error to the caller.
+ errorChan chan struct{}
+ // goAway is closed to notify the upper layer (i.e., addrConn.transportMonitor)
+ // that the server sent GoAway on this transport.
+ goAway chan struct{}
+
+ framer *framer
+ hBuf *bytes.Buffer // the buffer for HPACK encoding
+ hEnc *hpack.Encoder // HPACK encoder
+
+ // controlBuf delivers all the control related tasks (e.g., window
+ // updates, reset streams, and various settings) to the controller.
+ controlBuf *recvBuffer
+ fc *inFlow
+ // sendQuotaPool provides flow control to outbound message.
+ sendQuotaPool *quotaPool
+ // streamsQuota limits the max number of concurrent streams.
+ streamsQuota *quotaPool
+
+ // The scheme used: https if TLS is on, http otherwise.
+ scheme string
+
+ creds []credentials.PerRPCCredentials
+
+ mu sync.Mutex // guard the following variables
+ state transportState // the state of underlying connection
+ activeStreams map[uint32]*Stream
+ // The max number of concurrent streams
+ maxStreams int
+ // the per-stream outbound flow control window size set by the peer.
+ streamSendQuota uint32
+ // goAwayID records the Last-Stream-ID in the GoAway frame from the server.
+ goAwayID uint32
+ // prevGoAway ID records the Last-Stream-ID in the previous GOAway frame.
+ prevGoAwayID uint32
+}
+
+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 dialContext(ctx, "tcp", addr)
+}
+
+func isTemporary(err error) bool {
+ switch err {
+ case io.EOF:
+ // Connection closures may be resolved upon retry, and are thus
+ // treated as temporary.
+ return true
+ case context.DeadlineExceeded:
+ // In Go 1.7, context.DeadlineExceeded implements Timeout(), and this
+ // special case is not needed. Until then, we need to keep this
+ // clause.
+ return true
+ }
+
+ 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 false
+}
+
+// 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(ctx context.Context, addr TargetInfo, opts ConnectOptions) (_ ClientTransport, err error) {
+ scheme := "http"
+ conn, err := dial(ctx, opts.Dialer, addr.Addr)
+ if err != nil {
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ // Any further errors will close the underlying connection
+ defer func(conn net.Conn) {
+ if err != nil {
+ conn.Close()
+ }
+ }(conn)
+ var authInfo credentials.AuthInfo
+ if creds := opts.TransportCredentials; creds != nil {
+ scheme = "https"
+ conn, authInfo, err = creds.ClientHandshake(ctx, addr.Addr, conn)
+ if err != nil {
+ // Credentials handshake errors are typically considered permanent
+ // to avoid retrying on e.g. bad certificates.
+ temp := isTemporary(err)
+ return nil, connectionErrorf(temp, err, "transport: %v", err)
+ }
+ }
+ ua := primaryUA
+ if opts.UserAgent != "" {
+ ua = opts.UserAgent + " " + ua
+ }
+ var buf bytes.Buffer
+ t := &http2Client{
+ target: addr.Addr,
+ userAgent: ua,
+ md: addr.Metadata,
+ conn: conn,
+ authInfo: authInfo,
+ // The client initiated stream id is odd starting from 1.
+ nextID: 1,
+ writableChan: make(chan int, 1),
+ shutdownChan: make(chan struct{}),
+ errorChan: make(chan struct{}),
+ goAway: make(chan struct{}),
+ framer: newFramer(conn),
+ hBuf: &buf,
+ hEnc: hpack.NewEncoder(&buf),
+ controlBuf: newRecvBuffer(),
+ fc: &inFlow{limit: initialConnWindowSize},
+ sendQuotaPool: newQuotaPool(defaultWindowSize),
+ scheme: scheme,
+ state: reachable,
+ activeStreams: make(map[uint32]*Stream),
+ creds: opts.PerRPCCredentials,
+ maxStreams: math.MaxInt32,
+ streamSendQuota: defaultWindowSize,
+ }
+ // 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: %v", err)
+ }
+ if n != len(clientPreface) {
+ t.Close()
+ return nil, connectionErrorf(true, err, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
+ }
+ if initialWindowSize != defaultWindowSize {
+ err = t.framer.writeSettings(true, http2.Setting{
+ ID: http2.SettingInitialWindowSize,
+ Val: uint32(initialWindowSize),
+ })
+ } else {
+ err = t.framer.writeSettings(true)
+ }
+ if err != nil {
+ t.Close()
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ // Adjust the connection flow control window if needed.
+ if delta := uint32(initialConnWindowSize - defaultWindowSize); delta > 0 {
+ if err := t.framer.writeWindowUpdate(true, 0, delta); err != nil {
+ t.Close()
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ }
+ go t.controller()
+ t.writableChan <- 0
+ return t, nil
+}
+
+func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
+ // TODO(zhaoq): Handle uint32 overflow of Stream.id.
+ s := &Stream{
+ id: t.nextID,
+ done: make(chan struct{}),
+ goAway: make(chan struct{}),
+ method: callHdr.Method,
+ sendCompress: callHdr.SendCompress,
+ buf: newRecvBuffer(),
+ fc: &inFlow{limit: initialWindowSize},
+ sendQuotaPool: newQuotaPool(int(t.streamSendQuota)),
+ headerChan: make(chan struct{}),
+ }
+ t.nextID += 2
+ s.windowHandler = func(n int) {
+ t.updateWindow(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.dec = &recvBufferReader{
+ ctx: s.ctx,
+ goAway: s.goAway,
+ recv: s.buf,
+ }
+ return s
+}
+
+// NewStream creates a stream and register it into the transport as "active"
+// streams.
+func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Stream, err error) {
+ pr := &peer.Peer{
+ Addr: t.conn.RemoteAddr(),
+ }
+ // Attach Auth info if there is any.
+ if t.authInfo != nil {
+ pr.AuthInfo = t.authInfo
+ }
+ ctx = peer.NewContext(ctx, pr)
+ authData := make(map[string]string)
+ for _, c := range t.creds {
+ // Construct URI required to get auth request metadata.
+ var port string
+ if pos := strings.LastIndex(t.target, ":"); pos != -1 {
+ // Omit port if it is the default one.
+ if t.target[pos+1:] != "443" {
+ port = ":" + t.target[pos+1:]
+ }
+ }
+ pos := strings.LastIndex(callHdr.Method, "/")
+ if pos == -1 {
+ return nil, streamErrorf(codes.InvalidArgument, "transport: malformed method name: %q", callHdr.Method)
+ }
+ audience := "https://" + callHdr.Host + port + callHdr.Method[:pos]
+ data, err := c.GetRequestMetadata(ctx, audience)
+ if err != nil {
+ return nil, streamErrorf(codes.InvalidArgument, "transport: %v", err)
+ }
+ for k, v := range data {
+ authData[k] = v
+ }
+ }
+ t.mu.Lock()
+ if t.activeStreams == nil {
+ t.mu.Unlock()
+ return nil, ErrConnClosing
+ }
+ if t.state == draining {
+ t.mu.Unlock()
+ return nil, ErrStreamDrain
+ }
+ if t.state != reachable {
+ t.mu.Unlock()
+ return nil, ErrConnClosing
+ }
+ checkStreamsQuota := t.streamsQuota != nil
+ t.mu.Unlock()
+ if checkStreamsQuota {
+ sq, err := wait(ctx, nil, nil, t.shutdownChan, t.streamsQuota.acquire())
+ if err != nil {
+ return nil, err
+ }
+ // Returns the quota balance back.
+ if sq > 1 {
+ t.streamsQuota.add(sq - 1)
+ }
+ }
+ if _, err := wait(ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
+ // Return the quota back now because there is no stream returned to the caller.
+ if _, ok := err.(StreamError); ok && checkStreamsQuota {
+ t.streamsQuota.add(1)
+ }
+ return nil, err
+ }
+ t.mu.Lock()
+ if t.state == draining {
+ t.mu.Unlock()
+ if checkStreamsQuota {
+ t.streamsQuota.add(1)
+ }
+ // Need to make t writable again so that the rpc in flight can still proceed.
+ t.writableChan <- 0
+ return nil, ErrStreamDrain
+ }
+ if t.state != reachable {
+ t.mu.Unlock()
+ return nil, ErrConnClosing
+ }
+ s := t.newStream(ctx, callHdr)
+ t.activeStreams[s.id] = s
+
+ // This stream is not counted when applySetings(...) initialize t.streamsQuota.
+ // Reset t.streamsQuota to the right value.
+ var reset bool
+ if !checkStreamsQuota && t.streamsQuota != nil {
+ reset = true
+ }
+ t.mu.Unlock()
+ if reset {
+ t.streamsQuota.reset(-1)
+ }
+
+ // HPACK encodes various headers. Note that once WriteField(...) is
+ // called, the corresponding headers/continuation frame has to be sent
+ // because hpack.Encoder is stateful.
+ t.hBuf.Reset()
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":method", Value: "POST"})
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":scheme", Value: t.scheme})
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":path", Value: callHdr.Method})
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":authority", Value: callHdr.Host})
+ t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
+ t.hEnc.WriteField(hpack.HeaderField{Name: "user-agent", Value: t.userAgent})
+ t.hEnc.WriteField(hpack.HeaderField{Name: "te", Value: "trailers"})
+
+ if callHdr.SendCompress != "" {
+ t.hEnc.WriteField(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.
+ timeout := dl.Sub(time.Now())
+ t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-timeout", Value: encodeTimeout(timeout)})
+ }
+
+ for k, v := range authData {
+ // Capital header names are illegal in HTTP/2.
+ k = strings.ToLower(k)
+ t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: v})
+ }
+ var (
+ hasMD bool
+ endHeaders bool
+ )
+ if md, ok := metadata.FromContext(ctx); ok {
+ hasMD = true
+ for k, v := range md {
+ // HTTP doesn't allow you to set pseudoheaders after non pseudoheaders were set.
+ if isReservedHeader(k) {
+ continue
+ }
+ for _, entry := range v {
+ t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
+ }
+ }
+ }
+ if md, ok := t.md.(*metadata.MD); ok {
+ for k, v := range *md {
+ if isReservedHeader(k) {
+ continue
+ }
+ for _, entry := range v {
+ t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
+ }
+ }
+ }
+ first := true
+ // Sends the headers in a single batch even when they span multiple frames.
+ for !endHeaders {
+ size := t.hBuf.Len()
+ if size > http2MaxFrameLen {
+ size = http2MaxFrameLen
+ } else {
+ endHeaders = true
+ }
+ var flush bool
+ if endHeaders && (hasMD || callHdr.Flush) {
+ flush = true
+ }
+ if first {
+ // Sends a HeadersFrame to server to start a new stream.
+ p := http2.HeadersFrameParam{
+ StreamID: s.id,
+ BlockFragment: t.hBuf.Next(size),
+ EndStream: false,
+ EndHeaders: endHeaders,
+ }
+ // Do a force flush for the buffered frames iff it is the last headers frame
+ // and there is header metadata to be sent. Otherwise, there is flushing until
+ // the corresponding data frame is written.
+ err = t.framer.writeHeaders(flush, p)
+ first = false
+ } else {
+ // Sends Continuation frames for the leftover headers.
+ err = t.framer.writeContinuation(flush, s.id, endHeaders, t.hBuf.Next(size))
+ }
+ if err != nil {
+ t.notifyError(err)
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ }
+ t.writableChan <- 0
+ 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 updateStreams bool
+ t.mu.Lock()
+ if t.activeStreams == nil {
+ t.mu.Unlock()
+ return
+ }
+ if t.streamsQuota != nil {
+ updateStreams = true
+ }
+ delete(t.activeStreams, s.id)
+ if t.state == draining && len(t.activeStreams) == 0 {
+ // The transport is draining and s is the last live stream on t.
+ t.mu.Unlock()
+ t.Close()
+ return
+ }
+ t.mu.Unlock()
+ if updateStreams {
+ t.streamsQuota.add(1)
+ }
+ s.mu.Lock()
+ if q := s.fc.resetPendingData(); q > 0 {
+ if n := t.fc.onRead(q); n > 0 {
+ t.controlBuf.put(&windowUpdate{0, n})
+ }
+ }
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return
+ }
+ if !s.headerDone {
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ s.state = streamDone
+ s.mu.Unlock()
+ if se, ok := err.(StreamError); ok && se.Code != codes.DeadlineExceeded {
+ t.controlBuf.put(&resetStream{s.id, http2.ErrCodeCancel})
+ }
+}
+
+// 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.
+func (t *http2Client) Close() (err error) {
+ t.mu.Lock()
+ if t.state == closing {
+ t.mu.Unlock()
+ return
+ }
+ if t.state == reachable || t.state == draining {
+ close(t.errorChan)
+ }
+ t.state = closing
+ t.mu.Unlock()
+ close(t.shutdownChan)
+ err = t.conn.Close()
+ t.mu.Lock()
+ streams := t.activeStreams
+ t.activeStreams = nil
+ t.mu.Unlock()
+ // Notify all active streams.
+ for _, s := range streams {
+ s.mu.Lock()
+ if !s.headerDone {
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ s.mu.Unlock()
+ s.write(recvMsg{err: ErrConnClosing})
+ }
+ return
+}
+
+func (t *http2Client) GracefulClose() error {
+ t.mu.Lock()
+ switch t.state {
+ case unreachable:
+ // The server may close the connection concurrently. t is not available for
+ // any streams. Close it now.
+ t.mu.Unlock()
+ t.Close()
+ return nil
+ case closing:
+ t.mu.Unlock()
+ return nil
+ }
+ // Notify the streams which were initiated after the server sent GOAWAY.
+ select {
+ case <-t.goAway:
+ n := t.prevGoAwayID
+ if n == 0 && t.nextID > 1 {
+ n = t.nextID - 2
+ }
+ m := t.goAwayID + 2
+ if m == 2 {
+ m = 1
+ }
+ for i := m; i <= n; i += 2 {
+ if s, ok := t.activeStreams[i]; ok {
+ close(s.goAway)
+ }
+ }
+ default:
+ }
+ if t.state == draining {
+ t.mu.Unlock()
+ return nil
+ }
+ t.state = draining
+ active := len(t.activeStreams)
+ t.mu.Unlock()
+ if active == 0 {
+ return t.Close()
+ }
+ return nil
+}
+
+// Write formats the data into HTTP2 data frame(s) and sends it out. The caller
+// should proceed only if Write returns nil.
+// TODO(zhaoq): opts.Delay is ignored in this implementation. Support it later
+// if it improves the performance.
+func (t *http2Client) Write(s *Stream, data []byte, opts *Options) error {
+ r := bytes.NewBuffer(data)
+ for {
+ var p []byte
+ if r.Len() > 0 {
+ size := http2MaxFrameLen
+ s.sendQuotaPool.add(0)
+ // Wait until the stream has some quota to send the data.
+ sq, err := wait(s.ctx, s.done, s.goAway, t.shutdownChan, s.sendQuotaPool.acquire())
+ if err != nil {
+ return err
+ }
+ t.sendQuotaPool.add(0)
+ // Wait until the transport has some quota to send the data.
+ tq, err := wait(s.ctx, s.done, s.goAway, t.shutdownChan, t.sendQuotaPool.acquire())
+ if err != nil {
+ if _, ok := err.(StreamError); ok || err == io.EOF {
+ t.sendQuotaPool.cancel()
+ }
+ return err
+ }
+ if sq < size {
+ size = sq
+ }
+ if tq < size {
+ size = tq
+ }
+ p = r.Next(size)
+ ps := len(p)
+ if ps < sq {
+ // Overbooked stream quota. Return it back.
+ s.sendQuotaPool.add(sq - ps)
+ }
+ if ps < tq {
+ // Overbooked transport quota. Return it back.
+ t.sendQuotaPool.add(tq - ps)
+ }
+ }
+ var (
+ endStream bool
+ forceFlush bool
+ )
+ if opts.Last && r.Len() == 0 {
+ endStream = true
+ }
+ // Indicate there is a writer who is about to write a data frame.
+ t.framer.adjustNumWriters(1)
+ // Got some quota. Try to acquire writing privilege on the transport.
+ if _, err := wait(s.ctx, s.done, s.goAway, t.shutdownChan, t.writableChan); err != nil {
+ if _, ok := err.(StreamError); ok || err == io.EOF {
+ // Return the connection quota back.
+ t.sendQuotaPool.add(len(p))
+ }
+ if t.framer.adjustNumWriters(-1) == 0 {
+ // This writer is the last one in this batch and has the
+ // responsibility to flush the buffered frames. It queues
+ // a flush request to controlBuf instead of flushing directly
+ // in order to avoid the race with other writing or flushing.
+ t.controlBuf.put(&flushIO{})
+ }
+ return err
+ }
+ select {
+ case <-s.ctx.Done():
+ t.sendQuotaPool.add(len(p))
+ if t.framer.adjustNumWriters(-1) == 0 {
+ t.controlBuf.put(&flushIO{})
+ }
+ t.writableChan <- 0
+ return ContextErr(s.ctx.Err())
+ default:
+ }
+ if r.Len() == 0 && t.framer.adjustNumWriters(0) == 1 {
+ // Do a force flush iff this is last frame for the entire gRPC message
+ // and the caller is the only writer at this moment.
+ forceFlush = true
+ }
+ // If WriteData fails, all the pending streams will be handled
+ // by http2Client.Close(). No explicit CloseStream() needs to be
+ // invoked.
+ if err := t.framer.writeData(forceFlush, s.id, endStream, p); err != nil {
+ t.notifyError(err)
+ return connectionErrorf(true, err, "transport: %v", err)
+ }
+ if t.framer.adjustNumWriters(-1) == 0 {
+ t.framer.flushWrite()
+ }
+ t.writableChan <- 0
+ if r.Len() == 0 {
+ break
+ }
+ }
+ if !opts.Last {
+ return nil
+ }
+ s.mu.Lock()
+ if s.state != streamDone {
+ s.state = streamWriteDone
+ }
+ s.mu.Unlock()
+ return nil
+}
+
+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
+}
+
+// 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 *http2Client) updateWindow(s *Stream, n uint32) {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.state == streamDone {
+ return
+ }
+ if w := t.fc.onRead(n); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ if w := s.fc.onRead(n); w > 0 {
+ t.controlBuf.put(&windowUpdate{s.id, w})
+ }
+}
+
+func (t *http2Client) handleData(f *http2.DataFrame) {
+ size := len(f.Data())
+ if err := t.fc.onData(uint32(size)); err != nil {
+ t.notifyError(connectionErrorf(true, err, "%v", err))
+ return
+ }
+ // Select the right stream to dispatch.
+ s, ok := t.getStream(f)
+ if !ok {
+ if w := t.fc.onRead(uint32(size)); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ return
+ }
+ if size > 0 {
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ // The stream has been closed. Release the corresponding quota.
+ if w := t.fc.onRead(uint32(size)); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ return
+ }
+ if err := s.fc.onData(uint32(size)); err != nil {
+ s.state = streamDone
+ s.statusCode = codes.Internal
+ s.statusDesc = err.Error()
+ close(s.done)
+ s.mu.Unlock()
+ s.write(recvMsg{err: io.EOF})
+ t.controlBuf.put(&resetStream{s.id, http2.ErrCodeFlowControl})
+ return
+ }
+ s.mu.Unlock()
+ // 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?
+ data := make([]byte, size)
+ copy(data, f.Data())
+ s.write(recvMsg{data: data})
+ }
+ // 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) {
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return
+ }
+ s.state = streamDone
+ s.statusCode = codes.Internal
+ s.statusDesc = "server closed the stream without sending trailers"
+ close(s.done)
+ s.mu.Unlock()
+ s.write(recvMsg{err: io.EOF})
+ }
+}
+
+func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
+ s, ok := t.getStream(f)
+ if !ok {
+ return
+ }
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return
+ }
+ s.state = streamDone
+ if !s.headerDone {
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ s.statusCode, ok = http2ErrConvTab[http2.ErrCode(f.ErrCode)]
+ if !ok {
+ grpclog.Println("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error ", f.ErrCode)
+ s.statusCode = codes.Unknown
+ }
+ s.statusDesc = fmt.Sprintf("stream terminated by RST_STREAM with error code: %d", f.ErrCode)
+ close(s.done)
+ s.mu.Unlock()
+ s.write(recvMsg{err: io.EOF})
+}
+
+func (t *http2Client) handleSettings(f *http2.SettingsFrame) {
+ if f.IsAck() {
+ return
+ }
+ var ss []http2.Setting
+ f.ForeachSetting(func(s http2.Setting) error {
+ ss = append(ss, s)
+ return nil
+ })
+ // The settings will be applied once the ack is sent.
+ t.controlBuf.put(&settings{ack: true, ss: ss})
+}
+
+func (t *http2Client) handlePing(f *http2.PingFrame) {
+ if f.IsAck() { // Do nothing.
+ 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 == reachable || t.state == draining {
+ if f.LastStreamID > 0 && f.LastStreamID%2 != 1 {
+ t.mu.Unlock()
+ t.notifyError(connectionErrorf(true, nil, "received illegal http2 GOAWAY frame: stream ID %d is even", f.LastStreamID))
+ return
+ }
+ select {
+ case <-t.goAway:
+ id := t.goAwayID
+ // t.goAway has been closed (i.e.,multiple GoAways).
+ if id < f.LastStreamID {
+ t.mu.Unlock()
+ t.notifyError(connectionErrorf(true, nil, "received illegal http2 GOAWAY frame: previously recv GOAWAY frame with LastStramID %d, currently recv %d", id, f.LastStreamID))
+ return
+ }
+ t.prevGoAwayID = id
+ t.goAwayID = f.LastStreamID
+ t.mu.Unlock()
+ return
+ default:
+ }
+ t.goAwayID = f.LastStreamID
+ close(t.goAway)
+ }
+ t.mu.Unlock()
+}
+
+func (t *http2Client) handleWindowUpdate(f *http2.WindowUpdateFrame) {
+ id := f.Header().StreamID
+ incr := f.Increment
+ if id == 0 {
+ t.sendQuotaPool.add(int(incr))
+ return
+ }
+ if s, ok := t.getStream(f); ok {
+ s.sendQuotaPool.add(int(incr))
+ }
+}
+
+// operateHeaders takes action on the decoded headers.
+func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
+ s, ok := t.getStream(frame)
+ if !ok {
+ return
+ }
+ var state decodeState
+ for _, hf := range frame.Fields {
+ state.processHeaderField(hf)
+ }
+ if state.err != nil {
+ s.mu.Lock()
+ if !s.headerDone {
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ s.mu.Unlock()
+ s.write(recvMsg{err: state.err})
+ // Something wrong. Stops reading even when there is remaining.
+ return
+ }
+
+ endStream := frame.StreamEnded()
+
+ s.mu.Lock()
+ if !endStream {
+ s.recvCompress = state.encoding
+ }
+ if !s.headerDone {
+ if !endStream && len(state.mdata) > 0 {
+ s.header = state.mdata
+ }
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ if !endStream || s.state == streamDone {
+ s.mu.Unlock()
+ return
+ }
+
+ if len(state.mdata) > 0 {
+ s.trailer = state.mdata
+ }
+ s.statusCode = state.statusCode
+ s.statusDesc = state.statusDesc
+ close(s.done)
+ s.state = streamDone
+ s.mu.Unlock()
+ s.write(recvMsg{err: io.EOF})
+}
+
+func handleMalformedHTTP2(s *Stream, err error) {
+ s.mu.Lock()
+ if !s.headerDone {
+ close(s.headerChan)
+ s.headerDone = true
+ }
+ s.mu.Unlock()
+ s.write(recvMsg{err: err})
+}
+
+// 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() {
+ // Check the validity of server preface.
+ frame, err := t.framer.readFrame()
+ if err != nil {
+ t.notifyError(err)
+ return
+ }
+ sf, ok := frame.(*http2.SettingsFrame)
+ if !ok {
+ t.notifyError(err)
+ return
+ }
+ t.handleSettings(sf)
+
+ // loop to keep reading incoming messages on this transport.
+ for {
+ frame, err := t.framer.readFrame()
+ 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
+ handleMalformedHTTP2(s, streamErrorf(http2ErrConvTab[se.Code], "%v", t.framer.errorDetail()))
+ }
+ continue
+ } else {
+ // Transport error.
+ t.notifyError(err)
+ 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)
+ case *http2.PingFrame:
+ t.handlePing(frame)
+ case *http2.GoAwayFrame:
+ t.handleGoAway(frame)
+ case *http2.WindowUpdateFrame:
+ t.handleWindowUpdate(frame)
+ default:
+ grpclog.Printf("transport: http2Client.reader got unhandled frame type %v.", frame)
+ }
+ }
+}
+
+func (t *http2Client) applySettings(ss []http2.Setting) {
+ for _, s := range ss {
+ switch s.ID {
+ case http2.SettingMaxConcurrentStreams:
+ // TODO(zhaoq): This is a hack to avoid significant refactoring of the
+ // code to deal with the unrealistic int32 overflow. Probably will try
+ // to find a better way to handle this later.
+ if s.Val > math.MaxInt32 {
+ s.Val = math.MaxInt32
+ }
+ t.mu.Lock()
+ reset := t.streamsQuota != nil
+ if !reset {
+ t.streamsQuota = newQuotaPool(int(s.Val) - len(t.activeStreams))
+ }
+ ms := t.maxStreams
+ t.maxStreams = int(s.Val)
+ t.mu.Unlock()
+ if reset {
+ t.streamsQuota.reset(int(s.Val) - ms)
+ }
+ case http2.SettingInitialWindowSize:
+ t.mu.Lock()
+ for _, stream := range t.activeStreams {
+ // Adjust the sending quota for each stream.
+ stream.sendQuotaPool.reset(int(s.Val - t.streamSendQuota))
+ }
+ t.streamSendQuota = s.Val
+ t.mu.Unlock()
+ }
+ }
+}
+
+// controller running in a separate goroutine takes charge of sending control
+// frames (e.g., window update, reset stream, setting, etc.) to the server.
+func (t *http2Client) controller() {
+ for {
+ select {
+ case i := <-t.controlBuf.get():
+ t.controlBuf.load()
+ select {
+ case <-t.writableChan:
+ switch i := i.(type) {
+ case *windowUpdate:
+ t.framer.writeWindowUpdate(true, i.streamID, i.increment)
+ case *settings:
+ if i.ack {
+ t.framer.writeSettingsAck(true)
+ t.applySettings(i.ss)
+ } else {
+ t.framer.writeSettings(true, i.ss...)
+ }
+ case *resetStream:
+ t.framer.writeRSTStream(true, i.streamID, i.code)
+ case *flushIO:
+ t.framer.flushWrite()
+ case *ping:
+ t.framer.writePing(true, i.ack, i.data)
+ default:
+ grpclog.Printf("transport: http2Client.controller got unexpected item type %v\n", i)
+ }
+ t.writableChan <- 0
+ continue
+ case <-t.shutdownChan:
+ return
+ }
+ case <-t.shutdownChan:
+ return
+ }
+ }
+}
+
+func (t *http2Client) Error() <-chan struct{} {
+ return t.errorChan
+}
+
+func (t *http2Client) GoAway() <-chan struct{} {
+ return t.goAway
+}
+
+func (t *http2Client) notifyError(err error) {
+ t.mu.Lock()
+ // make sure t.errorChan is closed only once.
+ if t.state == draining {
+ t.mu.Unlock()
+ t.Close()
+ return
+ }
+ if t.state == reachable {
+ t.state = unreachable
+ close(t.errorChan)
+ grpclog.Printf("transport: http2Client.notifyError got notified that the client transport was broken %v.", err)
+ }
+ t.mu.Unlock()
+}
diff --git a/vendor/google.golang.org/grpc/transport/http2_server.go b/vendor/google.golang.org/grpc/transport/http2_server.go
new file mode 100644
index 000000000..a62fb7c22
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/http2_server.go
@@ -0,0 +1,775 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "bytes"
+ "errors"
+ "io"
+ "math"
+ "net"
+ "strconv"
+ "sync"
+
+ "golang.org/x/net/context"
+ "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/grpclog"
+ "google.golang.org/grpc/metadata"
+ "google.golang.org/grpc/peer"
+)
+
+// ErrIllegalHeaderWrite indicates that setting header is illegal because of
+// the stream's state.
+var ErrIllegalHeaderWrite = errors.New("transport: the stream is done or WriteHeader was already called")
+
+// http2Server implements the ServerTransport interface with HTTP2.
+type http2Server struct {
+ conn net.Conn
+ maxStreamID uint32 // max stream ID ever seen
+ authInfo credentials.AuthInfo // auth info about the connection
+ // writableChan synchronizes write access to the transport.
+ // A writer acquires the write lock by receiving a value on writableChan
+ // and releases it by sending on writableChan.
+ writableChan chan int
+ // shutdownChan is closed when Close is called.
+ // Blocking operations should select on shutdownChan to avoid
+ // blocking forever after Close.
+ shutdownChan chan struct{}
+ framer *framer
+ hBuf *bytes.Buffer // the buffer for HPACK encoding
+ hEnc *hpack.Encoder // HPACK encoder
+
+ // 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 *recvBuffer
+ fc *inFlow
+ // sendQuotaPool provides flow control to outbound message.
+ sendQuotaPool *quotaPool
+
+ mu sync.Mutex // guard the following
+ state transportState
+ activeStreams map[uint32]*Stream
+ // the per-stream outbound flow control window size set by the peer.
+ streamSendQuota uint32
+}
+
+// newHTTP2Server constructs a ServerTransport based on HTTP2. ConnectionError is
+// returned if something goes wrong.
+func newHTTP2Server(conn net.Conn, maxStreams uint32, authInfo credentials.AuthInfo) (_ ServerTransport, err error) {
+ framer := newFramer(conn)
+ // Send initial settings as connection preface to client.
+ var settings []http2.Setting
+ // TODO(zhaoq): Have a better way to signal "no limit" because 0 is
+ // permitted in the HTTP2 spec.
+ if maxStreams == 0 {
+ maxStreams = math.MaxUint32
+ } else {
+ settings = append(settings, http2.Setting{
+ ID: http2.SettingMaxConcurrentStreams,
+ Val: maxStreams,
+ })
+ }
+ if initialWindowSize != defaultWindowSize {
+ settings = append(settings, http2.Setting{
+ ID: http2.SettingInitialWindowSize,
+ Val: uint32(initialWindowSize)})
+ }
+ if err := framer.writeSettings(true, settings...); err != nil {
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ // Adjust the connection flow control window if needed.
+ if delta := uint32(initialConnWindowSize - defaultWindowSize); delta > 0 {
+ if err := framer.writeWindowUpdate(true, 0, delta); err != nil {
+ return nil, connectionErrorf(true, err, "transport: %v", err)
+ }
+ }
+ var buf bytes.Buffer
+ t := &http2Server{
+ conn: conn,
+ authInfo: authInfo,
+ framer: framer,
+ hBuf: &buf,
+ hEnc: hpack.NewEncoder(&buf),
+ maxStreams: maxStreams,
+ controlBuf: newRecvBuffer(),
+ fc: &inFlow{limit: initialConnWindowSize},
+ sendQuotaPool: newQuotaPool(defaultWindowSize),
+ state: reachable,
+ writableChan: make(chan int, 1),
+ shutdownChan: make(chan struct{}),
+ activeStreams: make(map[uint32]*Stream),
+ streamSendQuota: defaultWindowSize,
+ }
+ go t.controller()
+ t.writableChan <- 0
+ return t, nil
+}
+
+// operateHeader takes action on the decoded headers.
+func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream)) (close bool) {
+ buf := newRecvBuffer()
+ s := &Stream{
+ id: frame.Header().StreamID,
+ st: t,
+ buf: buf,
+ fc: &inFlow{limit: initialWindowSize},
+ }
+
+ var state decodeState
+ for _, hf := range frame.Fields {
+ state.processHeaderField(hf)
+ }
+ if err := state.err; err != nil {
+ if se, ok := err.(StreamError); ok {
+ t.controlBuf.put(&resetStream{s.id, statusCodeConvTab[se.Code]})
+ }
+ return
+ }
+
+ if frame.StreamEnded() {
+ // s is just created by the caller. No lock needed.
+ s.state = streamReadDone
+ }
+ s.recvCompress = state.encoding
+ if state.timeoutSet {
+ s.ctx, s.cancel = context.WithTimeout(context.TODO(), state.timeout)
+ } else {
+ s.ctx, s.cancel = context.WithCancel(context.TODO())
+ }
+ pr := &peer.Peer{
+ Addr: t.conn.RemoteAddr(),
+ }
+ // Attach Auth info if there is any.
+ if t.authInfo != nil {
+ pr.AuthInfo = t.authInfo
+ }
+ s.ctx = peer.NewContext(s.ctx, pr)
+ // Cache the current stream to the context so that the server application
+ // can find out. Required when the server wants to send some metadata
+ // back to the client (unary call only).
+ s.ctx = newContextWithStream(s.ctx, s)
+ // Attach the received metadata to the context.
+ if len(state.mdata) > 0 {
+ s.ctx = metadata.NewContext(s.ctx, state.mdata)
+ }
+
+ s.dec = &recvBufferReader{
+ ctx: s.ctx,
+ recv: s.buf,
+ }
+ s.recvCompress = state.encoding
+ s.method = state.method
+ t.mu.Lock()
+ if t.state != reachable {
+ t.mu.Unlock()
+ return
+ }
+ if uint32(len(t.activeStreams)) >= t.maxStreams {
+ t.mu.Unlock()
+ t.controlBuf.put(&resetStream{s.id, http2.ErrCodeRefusedStream})
+ return
+ }
+ if s.id%2 != 1 || s.id <= t.maxStreamID {
+ t.mu.Unlock()
+ // illegal gRPC stream id.
+ grpclog.Println("transport: http2Server.HandleStreams received an illegal stream id: ", s.id)
+ return true
+ }
+ t.maxStreamID = s.id
+ s.sendQuotaPool = newQuotaPool(int(t.streamSendQuota))
+ t.activeStreams[s.id] = s
+ t.mu.Unlock()
+ s.windowHandler = func(n int) {
+ t.updateWindow(s, uint32(n))
+ }
+ handle(s)
+ return
+}
+
+// HandleStreams receives incoming streams using the given handler. This is
+// typically run in a separate goroutine.
+func (t *http2Server) HandleStreams(handle func(*Stream)) {
+ // Check the validity of client preface.
+ preface := make([]byte, len(clientPreface))
+ if _, err := io.ReadFull(t.conn, preface); err != nil {
+ grpclog.Printf("transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
+ t.Close()
+ return
+ }
+ if !bytes.Equal(preface, clientPreface) {
+ grpclog.Printf("transport: http2Server.HandleStreams received bogus greeting from client: %q", preface)
+ t.Close()
+ return
+ }
+
+ frame, err := t.framer.readFrame()
+ if err == io.EOF || err == io.ErrUnexpectedEOF {
+ t.Close()
+ return
+ }
+ if err != nil {
+ grpclog.Printf("transport: http2Server.HandleStreams failed to read frame: %v", err)
+ t.Close()
+ return
+ }
+ sf, ok := frame.(*http2.SettingsFrame)
+ if !ok {
+ grpclog.Printf("transport: http2Server.HandleStreams saw invalid preface type %T from client", frame)
+ t.Close()
+ return
+ }
+ t.handleSettings(sf)
+
+ for {
+ frame, err := t.framer.readFrame()
+ if err != nil {
+ if se, ok := err.(http2.StreamError); ok {
+ t.mu.Lock()
+ s := t.activeStreams[se.StreamID]
+ t.mu.Unlock()
+ if s != nil {
+ t.closeStream(s)
+ }
+ t.controlBuf.put(&resetStream{se.StreamID, se.Code})
+ continue
+ }
+ if err == io.EOF || err == io.ErrUnexpectedEOF {
+ t.Close()
+ return
+ }
+ grpclog.Printf("transport: http2Server.HandleStreams failed to read frame: %v", err)
+ t.Close()
+ return
+ }
+ switch frame := frame.(type) {
+ case *http2.MetaHeadersFrame:
+ if t.operateHeaders(frame, handle) {
+ 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:
+ grpclog.Printf("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
+}
+
+// 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) {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.state == streamDone {
+ return
+ }
+ if w := t.fc.onRead(n); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ if w := s.fc.onRead(n); w > 0 {
+ t.controlBuf.put(&windowUpdate{s.id, w})
+ }
+}
+
+func (t *http2Server) handleData(f *http2.DataFrame) {
+ size := len(f.Data())
+ if err := t.fc.onData(uint32(size)); err != nil {
+ grpclog.Printf("transport: http2Server %v", err)
+ t.Close()
+ return
+ }
+ // Select the right stream to dispatch.
+ s, ok := t.getStream(f)
+ if !ok {
+ if w := t.fc.onRead(uint32(size)); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ return
+ }
+ if size > 0 {
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ // The stream has been closed. Release the corresponding quota.
+ if w := t.fc.onRead(uint32(size)); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ return
+ }
+ if err := s.fc.onData(uint32(size)); err != nil {
+ s.mu.Unlock()
+ t.closeStream(s)
+ t.controlBuf.put(&resetStream{s.id, http2.ErrCodeFlowControl})
+ return
+ }
+ s.mu.Unlock()
+ // 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?
+ data := make([]byte, size)
+ copy(data, f.Data())
+ s.write(recvMsg{data: data})
+ }
+ if f.Header().Flags.Has(http2.FlagDataEndStream) {
+ // Received the end of stream from the client.
+ s.mu.Lock()
+ if s.state != streamDone {
+ s.state = streamReadDone
+ }
+ s.mu.Unlock()
+ s.write(recvMsg{err: io.EOF})
+ }
+}
+
+func (t *http2Server) handleRSTStream(f *http2.RSTStreamFrame) {
+ s, ok := t.getStream(f)
+ if !ok {
+ return
+ }
+ t.closeStream(s)
+}
+
+func (t *http2Server) handleSettings(f *http2.SettingsFrame) {
+ if f.IsAck() {
+ return
+ }
+ var ss []http2.Setting
+ f.ForeachSetting(func(s http2.Setting) error {
+ ss = append(ss, s)
+ return nil
+ })
+ // The settings will be applied once the ack is sent.
+ t.controlBuf.put(&settings{ack: true, ss: ss})
+}
+
+func (t *http2Server) handlePing(f *http2.PingFrame) {
+ if f.IsAck() { // Do nothing.
+ return
+ }
+ pingAck := &ping{ack: true}
+ copy(pingAck.data[:], f.Data[:])
+ t.controlBuf.put(pingAck)
+}
+
+func (t *http2Server) handleWindowUpdate(f *http2.WindowUpdateFrame) {
+ id := f.Header().StreamID
+ incr := f.Increment
+ if id == 0 {
+ t.sendQuotaPool.add(int(incr))
+ return
+ }
+ if s, ok := t.getStream(f); ok {
+ s.sendQuotaPool.add(int(incr))
+ }
+}
+
+func (t *http2Server) writeHeaders(s *Stream, b *bytes.Buffer, endStream bool) error {
+ first := true
+ endHeaders := false
+ var err error
+ // Sends the headers in a single batch.
+ for !endHeaders {
+ size := t.hBuf.Len()
+ if size > http2MaxFrameLen {
+ size = http2MaxFrameLen
+ } else {
+ endHeaders = true
+ }
+ if first {
+ p := http2.HeadersFrameParam{
+ StreamID: s.id,
+ BlockFragment: b.Next(size),
+ EndStream: endStream,
+ EndHeaders: endHeaders,
+ }
+ err = t.framer.writeHeaders(endHeaders, p)
+ first = false
+ } else {
+ err = t.framer.writeContinuation(endHeaders, s.id, endHeaders, b.Next(size))
+ }
+ if err != nil {
+ t.Close()
+ return connectionErrorf(true, err, "transport: %v", err)
+ }
+ }
+ return nil
+}
+
+// WriteHeader sends the header metedata md back to the client.
+func (t *http2Server) WriteHeader(s *Stream, md metadata.MD) error {
+ s.mu.Lock()
+ if s.headerOk || s.state == streamDone {
+ s.mu.Unlock()
+ return ErrIllegalHeaderWrite
+ }
+ s.headerOk = true
+ if md.Len() > 0 {
+ if s.header.Len() > 0 {
+ s.header = metadata.Join(s.header, md)
+ } else {
+ s.header = md
+ }
+ }
+ md = s.header
+ s.mu.Unlock()
+ if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
+ return err
+ }
+ t.hBuf.Reset()
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
+ t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
+ if s.sendCompress != "" {
+ t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-encoding", Value: s.sendCompress})
+ }
+ for k, v := range md {
+ if isReservedHeader(k) {
+ // Clients don't tolerate reading restricted headers after some non restricted ones were sent.
+ continue
+ }
+ for _, entry := range v {
+ t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
+ }
+ }
+ if err := t.writeHeaders(s, t.hBuf, false); err != nil {
+ return err
+ }
+ t.writableChan <- 0
+ 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, statusCode codes.Code, statusDesc string) error {
+ var headersSent, hasHeader bool
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return nil
+ }
+ if s.headerOk {
+ headersSent = true
+ }
+ if s.header.Len() > 0 {
+ hasHeader = true
+ }
+ s.mu.Unlock()
+
+ if !headersSent && hasHeader {
+ t.WriteHeader(s, nil)
+ headersSent = true
+ }
+
+ if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
+ return err
+ }
+ t.hBuf.Reset()
+ if !headersSent {
+ t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
+ t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
+ }
+ t.hEnc.WriteField(
+ hpack.HeaderField{
+ Name: "grpc-status",
+ Value: strconv.Itoa(int(statusCode)),
+ })
+ t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-message", Value: encodeGrpcMessage(statusDesc)})
+ // Attach the trailer metadata.
+ for k, v := range s.trailer {
+ // Clients don't tolerate reading restricted headers after some non restricted ones were sent.
+ if isReservedHeader(k) {
+ continue
+ }
+ for _, entry := range v {
+ t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
+ }
+ }
+ if err := t.writeHeaders(s, t.hBuf, true); err != nil {
+ t.Close()
+ return err
+ }
+ t.closeStream(s)
+ t.writableChan <- 0
+ 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, data []byte, opts *Options) error {
+ // TODO(zhaoq): Support multi-writers for a single stream.
+ var writeHeaderFrame bool
+ s.mu.Lock()
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return streamErrorf(codes.Unknown, "the stream has been done")
+ }
+ if !s.headerOk {
+ writeHeaderFrame = true
+ }
+ s.mu.Unlock()
+ if writeHeaderFrame {
+ t.WriteHeader(s, nil)
+ }
+ r := bytes.NewBuffer(data)
+ for {
+ if r.Len() == 0 {
+ return nil
+ }
+ size := http2MaxFrameLen
+ s.sendQuotaPool.add(0)
+ // Wait until the stream has some quota to send the data.
+ sq, err := wait(s.ctx, nil, nil, t.shutdownChan, s.sendQuotaPool.acquire())
+ if err != nil {
+ return err
+ }
+ t.sendQuotaPool.add(0)
+ // Wait until the transport has some quota to send the data.
+ tq, err := wait(s.ctx, nil, nil, t.shutdownChan, t.sendQuotaPool.acquire())
+ if err != nil {
+ if _, ok := err.(StreamError); ok {
+ t.sendQuotaPool.cancel()
+ }
+ return err
+ }
+ if sq < size {
+ size = sq
+ }
+ if tq < size {
+ size = tq
+ }
+ p := r.Next(size)
+ ps := len(p)
+ if ps < sq {
+ // Overbooked stream quota. Return it back.
+ s.sendQuotaPool.add(sq - ps)
+ }
+ if ps < tq {
+ // Overbooked transport quota. Return it back.
+ t.sendQuotaPool.add(tq - ps)
+ }
+ t.framer.adjustNumWriters(1)
+ // Got some quota. Try to acquire writing privilege on the
+ // transport.
+ if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
+ if _, ok := err.(StreamError); ok {
+ // Return the connection quota back.
+ t.sendQuotaPool.add(ps)
+ }
+ if t.framer.adjustNumWriters(-1) == 0 {
+ // This writer is the last one in this batch and has the
+ // responsibility to flush the buffered frames. It queues
+ // a flush request to controlBuf instead of flushing directly
+ // in order to avoid the race with other writing or flushing.
+ t.controlBuf.put(&flushIO{})
+ }
+ return err
+ }
+ select {
+ case <-s.ctx.Done():
+ t.sendQuotaPool.add(ps)
+ if t.framer.adjustNumWriters(-1) == 0 {
+ t.controlBuf.put(&flushIO{})
+ }
+ t.writableChan <- 0
+ return ContextErr(s.ctx.Err())
+ default:
+ }
+ var forceFlush bool
+ if r.Len() == 0 && t.framer.adjustNumWriters(0) == 1 && !opts.Last {
+ forceFlush = true
+ }
+ if err := t.framer.writeData(forceFlush, s.id, false, p); err != nil {
+ t.Close()
+ return connectionErrorf(true, err, "transport: %v", err)
+ }
+ if t.framer.adjustNumWriters(-1) == 0 {
+ t.framer.flushWrite()
+ }
+ t.writableChan <- 0
+ }
+
+}
+
+func (t *http2Server) applySettings(ss []http2.Setting) {
+ for _, s := range ss {
+ if s.ID == http2.SettingInitialWindowSize {
+ t.mu.Lock()
+ defer t.mu.Unlock()
+ for _, stream := range t.activeStreams {
+ stream.sendQuotaPool.reset(int(s.Val - t.streamSendQuota))
+ }
+ t.streamSendQuota = s.Val
+ }
+
+ }
+}
+
+// controller running in a separate goroutine takes charge of sending control
+// frames (e.g., window update, reset stream, setting, etc.) to the server.
+func (t *http2Server) controller() {
+ for {
+ select {
+ case i := <-t.controlBuf.get():
+ t.controlBuf.load()
+ select {
+ case <-t.writableChan:
+ switch i := i.(type) {
+ case *windowUpdate:
+ t.framer.writeWindowUpdate(true, i.streamID, i.increment)
+ case *settings:
+ if i.ack {
+ t.framer.writeSettingsAck(true)
+ t.applySettings(i.ss)
+ } else {
+ t.framer.writeSettings(true, i.ss...)
+ }
+ case *resetStream:
+ t.framer.writeRSTStream(true, i.streamID, i.code)
+ case *goAway:
+ t.mu.Lock()
+ if t.state == closing {
+ t.mu.Unlock()
+ // The transport is closing.
+ return
+ }
+ sid := t.maxStreamID
+ t.state = draining
+ t.mu.Unlock()
+ t.framer.writeGoAway(true, sid, http2.ErrCodeNo, nil)
+ case *flushIO:
+ t.framer.flushWrite()
+ case *ping:
+ t.framer.writePing(true, i.ack, i.data)
+ default:
+ grpclog.Printf("transport: http2Server.controller got unexpected item type %v\n", i)
+ }
+ t.writableChan <- 0
+ continue
+ case <-t.shutdownChan:
+ return
+ }
+ case <-t.shutdownChan:
+ 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() (err 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()
+ close(t.shutdownChan)
+ err = t.conn.Close()
+ // Cancel all active streams.
+ for _, s := range streams {
+ s.cancel()
+ }
+ return
+}
+
+// closeStream clears the footprint of a stream when the stream is not needed
+// any more.
+func (t *http2Server) closeStream(s *Stream) {
+ t.mu.Lock()
+ delete(t.activeStreams, s.id)
+ if t.state == draining && len(t.activeStreams) == 0 {
+ defer t.Close()
+ }
+ t.mu.Unlock()
+ // 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()
+ s.mu.Lock()
+ if q := s.fc.resetPendingData(); q > 0 {
+ if w := t.fc.onRead(q); w > 0 {
+ t.controlBuf.put(&windowUpdate{0, w})
+ }
+ }
+ if s.state == streamDone {
+ s.mu.Unlock()
+ return
+ }
+ s.state = streamDone
+ s.mu.Unlock()
+}
+
+func (t *http2Server) RemoteAddr() net.Addr {
+ return t.conn.RemoteAddr()
+}
+
+func (t *http2Server) Drain() {
+ t.controlBuf.put(&goAway{})
+}
diff --git a/vendor/google.golang.org/grpc/transport/http_util.go b/vendor/google.golang.org/grpc/transport/http_util.go
new file mode 100644
index 000000000..a3c68d4ca
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/http_util.go
@@ -0,0 +1,513 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io"
+ "net"
+ "strconv"
+ "strings"
+ "sync/atomic"
+ "time"
+
+ "golang.org/x/net/http2"
+ "golang.org/x/net/http2/hpack"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/grpclog"
+ "google.golang.org/grpc/metadata"
+)
+
+const (
+ // The primary user agent
+ primaryUA = "grpc-go/1.0"
+ // http2MaxFrameLen specifies the max length of a HTTP2 frame.
+ http2MaxFrameLen = 16384 // 16KB frame
+ // http://http2.github.io/http2-spec/#SettingValues
+ http2InitHeaderTableSize = 4096
+ // http2IOBufSize specifies the buffer size for sending frames.
+ http2IOBufSize = 32 * 1024
+)
+
+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.FailedPrecondition,
+ }
+ 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,
+ }
+)
+
+// Records the states during HPACK decoding. Must be reset once the
+// decoding of the entire headers are finished.
+type decodeState struct {
+ err error // first error encountered decoding
+
+ encoding string
+ // statusCode caches the stream status received from the trailer
+ // the server sent. Client side only.
+ statusCode codes.Code
+ statusDesc string
+ // Server side only fields.
+ timeoutSet bool
+ timeout time.Duration
+ method string
+ // key-value metadata map from the peer.
+ mdata map[string][]string
+}
+
+// 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",
+ "grpc-message-type",
+ "grpc-encoding",
+ "grpc-message",
+ "grpc-status",
+ "grpc-timeout",
+ "te":
+ return true
+ default:
+ return false
+ }
+}
+
+// isWhitelistedPseudoHeader checks whether hdr belongs to HTTP2 pseudoheaders
+// that should be propagated into metadata visible to users.
+func isWhitelistedPseudoHeader(hdr string) bool {
+ switch hdr {
+ case ":authority":
+ return true
+ default:
+ return false
+ }
+}
+
+func (d *decodeState) setErr(err error) {
+ if d.err == nil {
+ d.err = err
+ }
+}
+
+func validContentType(t string) bool {
+ e := "application/grpc"
+ if !strings.HasPrefix(t, e) {
+ return false
+ }
+ // Support variations on the content-type
+ // (e.g. "application/grpc+blah", "application/grpc;blah").
+ if len(t) > len(e) && t[len(e)] != '+' && t[len(e)] != ';' {
+ return false
+ }
+ return true
+}
+
+func (d *decodeState) processHeaderField(f hpack.HeaderField) {
+ switch f.Name {
+ case "content-type":
+ if !validContentType(f.Value) {
+ d.setErr(streamErrorf(codes.FailedPrecondition, "transport: received the unexpected content-type %q", f.Value))
+ return
+ }
+ case "grpc-encoding":
+ d.encoding = f.Value
+ case "grpc-status":
+ code, err := strconv.Atoi(f.Value)
+ if err != nil {
+ d.setErr(streamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err))
+ return
+ }
+ d.statusCode = codes.Code(code)
+ case "grpc-message":
+ d.statusDesc = decodeGrpcMessage(f.Value)
+ case "grpc-timeout":
+ d.timeoutSet = true
+ var err error
+ d.timeout, err = decodeTimeout(f.Value)
+ if err != nil {
+ d.setErr(streamErrorf(codes.Internal, "transport: malformed time-out: %v", err))
+ return
+ }
+ case ":path":
+ d.method = f.Value
+ default:
+ if !isReservedHeader(f.Name) || isWhitelistedPseudoHeader(f.Name) {
+ if f.Name == "user-agent" {
+ i := strings.LastIndex(f.Value, " ")
+ if i == -1 {
+ // There is no application user agent string being set.
+ return
+ }
+ // Extract the application user agent string.
+ f.Value = f.Value[:i]
+ }
+ if d.mdata == nil {
+ d.mdata = make(map[string][]string)
+ }
+ k, v, err := metadata.DecodeKeyValue(f.Name, f.Value)
+ if err != nil {
+ grpclog.Printf("Failed to decode (%q, %q): %v", f.Name, f.Value, err)
+ return
+ }
+ d.mdata[k] = append(d.mdata[k], 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)
+ }
+ 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
+ }
+ return d * time.Duration(t), nil
+}
+
+const (
+ spaceByte = ' '
+ tildaByte = '~'
+ percentByte = '%'
+)
+
+// encodeGrpcMessage is used to encode status code in header field
+// "grpc-message".
+// 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 < tildaByte && c != percentByte) {
+ return encodeGrpcMessageUnchecked(msg)
+ }
+ }
+ return msg
+}
+
+func encodeGrpcMessageUnchecked(msg string) string {
+ var buf bytes.Buffer
+ lenMsg := len(msg)
+ for i := 0; i < lenMsg; i++ {
+ c := msg[i]
+ if c >= spaceByte && c < tildaByte && c != percentByte {
+ buf.WriteByte(c)
+ } else {
+ buf.WriteString(fmt.Sprintf("%%%02X", c))
+ }
+ }
+ 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 framer struct {
+ numWriters int32
+ reader io.Reader
+ writer *bufio.Writer
+ fr *http2.Framer
+}
+
+func newFramer(conn net.Conn) *framer {
+ f := &framer{
+ reader: bufio.NewReaderSize(conn, http2IOBufSize),
+ writer: bufio.NewWriterSize(conn, http2IOBufSize),
+ }
+ f.fr = http2.NewFramer(f.writer, f.reader)
+ f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
+ return f
+}
+
+func (f *framer) adjustNumWriters(i int32) int32 {
+ return atomic.AddInt32(&f.numWriters, i)
+}
+
+// The following writeXXX functions can only be called when the caller gets
+// unblocked from writableChan channel (i.e., owns the privilege to write).
+
+func (f *framer) writeContinuation(forceFlush bool, streamID uint32, endHeaders bool, headerBlockFragment []byte) error {
+ if err := f.fr.WriteContinuation(streamID, endHeaders, headerBlockFragment); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeData(forceFlush bool, streamID uint32, endStream bool, data []byte) error {
+ if err := f.fr.WriteData(streamID, endStream, data); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeGoAway(forceFlush bool, maxStreamID uint32, code http2.ErrCode, debugData []byte) error {
+ if err := f.fr.WriteGoAway(maxStreamID, code, debugData); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeHeaders(forceFlush bool, p http2.HeadersFrameParam) error {
+ if err := f.fr.WriteHeaders(p); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writePing(forceFlush, ack bool, data [8]byte) error {
+ if err := f.fr.WritePing(ack, data); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writePriority(forceFlush bool, streamID uint32, p http2.PriorityParam) error {
+ if err := f.fr.WritePriority(streamID, p); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writePushPromise(forceFlush bool, p http2.PushPromiseParam) error {
+ if err := f.fr.WritePushPromise(p); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeRSTStream(forceFlush bool, streamID uint32, code http2.ErrCode) error {
+ if err := f.fr.WriteRSTStream(streamID, code); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeSettings(forceFlush bool, settings ...http2.Setting) error {
+ if err := f.fr.WriteSettings(settings...); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeSettingsAck(forceFlush bool) error {
+ if err := f.fr.WriteSettingsAck(); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) writeWindowUpdate(forceFlush bool, streamID, incr uint32) error {
+ if err := f.fr.WriteWindowUpdate(streamID, incr); err != nil {
+ return err
+ }
+ if forceFlush {
+ return f.writer.Flush()
+ }
+ return nil
+}
+
+func (f *framer) flushWrite() error {
+ return f.writer.Flush()
+}
+
+func (f *framer) readFrame() (http2.Frame, error) {
+ return f.fr.ReadFrame()
+}
+
+func (f *framer) errorDetail() error {
+ return f.fr.ErrorDetail()
+}
diff --git a/vendor/google.golang.org/grpc/transport/pre_go16.go b/vendor/google.golang.org/grpc/transport/pre_go16.go
new file mode 100644
index 000000000..33d91c17c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/pre_go16.go
@@ -0,0 +1,51 @@
+// +build !go1.6
+
+/*
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package transport
+
+import (
+ "net"
+ "time"
+
+ "golang.org/x/net/context"
+)
+
+// dialContext connects to the address on the named network.
+func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
+ var dialer net.Dialer
+ if deadline, ok := ctx.Deadline(); ok {
+ dialer.Timeout = deadline.Sub(time.Now())
+ }
+ return dialer.Dial(network, address)
+}
diff --git a/vendor/google.golang.org/grpc/transport/transport.go b/vendor/google.golang.org/grpc/transport/transport.go
new file mode 100644
index 000000000..413f7493b
--- /dev/null
+++ b/vendor/google.golang.org/grpc/transport/transport.go
@@ -0,0 +1,595 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+Package transport defines and implements message oriented communication channel
+to complete various transactions (e.g., an RPC).
+*/
+package transport // import "google.golang.org/grpc/transport"
+
+import (
+ "bytes"
+ "fmt"
+ "io"
+ "net"
+ "sync"
+
+ "golang.org/x/net/context"
+ "golang.org/x/net/trace"
+ "google.golang.org/grpc/codes"
+ "google.golang.org/grpc/credentials"
+ "google.golang.org/grpc/metadata"
+)
+
+// recvMsg represents the received msg from the transport. All transport
+// protocol specific info has been removed.
+type recvMsg struct {
+ data []byte
+ // nil: received some data
+ // io.EOF: stream is completed. data is nil.
+ // other non-nil error: transport failure. data is nil.
+ err error
+}
+
+func (*recvMsg) item() {}
+
+// All items in an out of a recvBuffer should be the same type.
+type item interface {
+ item()
+}
+
+// recvBuffer is an unbounded channel of item.
+type recvBuffer struct {
+ c chan item
+ mu sync.Mutex
+ backlog []item
+}
+
+func newRecvBuffer() *recvBuffer {
+ b := &recvBuffer{
+ c: make(chan item, 1),
+ }
+ return b
+}
+
+func (b *recvBuffer) put(r item) {
+ b.mu.Lock()
+ defer b.mu.Unlock()
+ if len(b.backlog) == 0 {
+ select {
+ case b.c <- r:
+ return
+ default:
+ }
+ }
+ b.backlog = append(b.backlog, r)
+}
+
+func (b *recvBuffer) load() {
+ b.mu.Lock()
+ defer b.mu.Unlock()
+ if len(b.backlog) > 0 {
+ select {
+ case b.c <- b.backlog[0]:
+ b.backlog = b.backlog[1:]
+ default:
+ }
+ }
+}
+
+// get returns the channel that receives an item in the buffer.
+//
+// Upon receipt of an item, the caller should call load to send another
+// item onto the channel if there is any.
+func (b *recvBuffer) get() <-chan item {
+ return b.c
+}
+
+// recvBufferReader implements io.Reader interface to read the data from
+// recvBuffer.
+type recvBufferReader struct {
+ ctx context.Context
+ goAway chan struct{}
+ recv *recvBuffer
+ last *bytes.Reader // Stores the remaining data in the previous calls.
+ err error
+}
+
+// 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
+ }
+ defer func() { r.err = err }()
+ if r.last != nil && r.last.Len() > 0 {
+ // Read remaining data left in last call.
+ return r.last.Read(p)
+ }
+ select {
+ case <-r.ctx.Done():
+ return 0, ContextErr(r.ctx.Err())
+ case <-r.goAway:
+ return 0, ErrStreamDrain
+ case i := <-r.recv.get():
+ r.recv.load()
+ m := i.(*recvMsg)
+ if m.err != nil {
+ return 0, m.err
+ }
+ r.last = bytes.NewReader(m.data)
+ return r.last.Read(p)
+ }
+}
+
+type streamState uint8
+
+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
+ // nil for client side Stream.
+ st ServerTransport
+ // ctx is the associated context of the stream.
+ ctx context.Context
+ // cancel is always nil for client side Stream.
+ cancel context.CancelFunc
+ // done is closed when the final status arrives.
+ done chan struct{}
+ // goAway is closed when the server sent GoAways signal before this stream was initiated.
+ goAway chan struct{}
+ // method records the associated RPC method of the stream.
+ method string
+ recvCompress string
+ sendCompress string
+ buf *recvBuffer
+ dec io.Reader
+ fc *inFlow
+ recvQuota uint32
+ // The accumulated inbound quota pending for window update.
+ updateQuota uint32
+ // The handler to control the window update procedure for both this
+ // particular stream and the associated transport.
+ windowHandler func(int)
+
+ sendQuotaPool *quotaPool
+ // Close headerChan to indicate the end of reception of header metadata.
+ headerChan chan struct{}
+ // header caches the received header metadata.
+ header metadata.MD
+ // The key-value map of trailer metadata.
+ trailer metadata.MD
+
+ mu sync.RWMutex // guard the following
+ // headerOK becomes true from the first header is about to send.
+ headerOk bool
+ state streamState
+ // true iff headerChan is closed. Used to avoid closing headerChan
+ // multiple times.
+ headerDone bool
+ // the status received from the server.
+ statusCode codes.Code
+ statusDesc string
+}
+
+// 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 {
+ return s.recvCompress
+}
+
+// SetSendCompress sets the compression algorithm to the stream.
+func (s *Stream) SetSendCompress(str string) {
+ s.sendCompress = str
+}
+
+// Done returns a chanel which is closed when it receives the final status
+// from the server.
+func (s *Stream) Done() <-chan struct{} {
+ return s.done
+}
+
+// GoAway returns a channel which is closed when the server sent GoAways signal
+// before this stream was initiated.
+func (s *Stream) GoAway() <-chan struct{} {
+ return s.goAway
+}
+
+// Header 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 cancelled/expired.
+func (s *Stream) Header() (metadata.MD, error) {
+ select {
+ case <-s.ctx.Done():
+ return nil, ContextErr(s.ctx.Err())
+ case <-s.goAway:
+ return nil, ErrStreamDrain
+ case <-s.headerChan:
+ return s.header.Copy(), 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.
+func (s *Stream) Trailer() metadata.MD {
+ s.mu.RLock()
+ defer s.mu.RUnlock()
+ return s.trailer.Copy()
+}
+
+// ServerTransport returns the underlying ServerTransport for the stream.
+// The client side stream always returns nil.
+func (s *Stream) ServerTransport() ServerTransport {
+ return s.st
+}
+
+// Context returns the context of the stream.
+func (s *Stream) Context() context.Context {
+ return s.ctx
+}
+
+// TraceContext recreates the context of s with a trace.Trace.
+func (s *Stream) TraceContext(tr trace.Trace) {
+ s.ctx = trace.NewContext(s.ctx, tr)
+}
+
+// Method returns the method for the stream.
+func (s *Stream) Method() string {
+ return s.method
+}
+
+// StatusCode returns statusCode received from the server.
+func (s *Stream) StatusCode() codes.Code {
+ return s.statusCode
+}
+
+// StatusDesc returns statusDesc received from the server.
+func (s *Stream) StatusDesc() string {
+ return s.statusDesc
+}
+
+// SetHeader sets the header metadata. This can be called multiple times.
+// Server side only.
+func (s *Stream) SetHeader(md metadata.MD) error {
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ if s.headerOk || s.state == streamDone {
+ return ErrIllegalHeaderWrite
+ }
+ if md.Len() == 0 {
+ return nil
+ }
+ s.header = metadata.Join(s.header, md)
+ return nil
+}
+
+// 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.
+func (s *Stream) SetTrailer(md metadata.MD) error {
+ if md.Len() == 0 {
+ return nil
+ }
+ s.mu.Lock()
+ defer s.mu.Unlock()
+ s.trailer = metadata.Join(s.trailer, md)
+ return nil
+}
+
+func (s *Stream) write(m recvMsg) {
+ s.buf.put(&m)
+}
+
+// Read 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.
+func (s *Stream) Read(p []byte) (n int, err error) {
+ n, err = s.dec.Read(p)
+ if err != nil {
+ return
+ }
+ s.windowHandler(n)
+ return
+}
+
+// The key to save transport.Stream in the context.
+type streamKey struct{}
+
+// newContextWithStream creates a new context from ctx and attaches stream
+// to it.
+func newContextWithStream(ctx context.Context, stream *Stream) context.Context {
+ return context.WithValue(ctx, streamKey{}, stream)
+}
+
+// StreamFromContext returns the stream saved in ctx.
+func StreamFromContext(ctx context.Context) (s *Stream, ok bool) {
+ s, ok = ctx.Value(streamKey{}).(*Stream)
+ return
+}
+
+// state of transport
+type transportState int
+
+const (
+ reachable transportState = iota
+ unreachable
+ closing
+ draining
+)
+
+// NewServerTransport creates a ServerTransport with conn or non-nil error
+// if it fails.
+func NewServerTransport(protocol string, conn net.Conn, maxStreams uint32, authInfo credentials.AuthInfo) (ServerTransport, error) {
+ return newHTTP2Server(conn, maxStreams, authInfo)
+}
+
+// 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)
+ // PerRPCCredentials stores the PerRPCCredentials required to issue RPCs.
+ PerRPCCredentials []credentials.PerRPCCredentials
+ // TransportCredentials stores the Authenticator required to setup a client connection.
+ TransportCredentials credentials.TransportCredentials
+}
+
+// TargetInfo contains the information of the target such as network address and metadata.
+type TargetInfo struct {
+ Addr string
+ Metadata interface{}
+}
+
+// NewClientTransport establishes the transport with the required ConnectOptions
+// and returns it to the caller.
+func NewClientTransport(ctx context.Context, target TargetInfo, opts ConnectOptions) (ClientTransport, error) {
+ return newHTTP2Client(ctx, target, opts)
+}
+
+// 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
+
+ // Delay is a hint to the transport implementation for whether
+ // the data could be buffered for a batching write. The
+ // Transport implementation may ignore the hint.
+ Delay 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
+
+ // RecvCompress specifies the compression algorithm applied on
+ // inbound messages.
+ RecvCompress string
+
+ // SendCompress specifies the compression algorithm applied on
+ // outbound message.
+ SendCompress string
+
+ // Flush indicates whether a new stream command should be sent
+ // to the peer without waiting for the first data. This is
+ // only a hint. The transport may modify the flush decision
+ // for performance purposes.
+ Flush bool
+}
+
+// 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. It stops accepting
+ // new RPCs and wait the completion of the pending RPCs.
+ GracefulClose() error
+
+ // 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, 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 ClientTranspor
+ // receives the draining signal from the server (e.g., GOAWAY frame in
+ // HTTP/2).
+ GoAway() <-chan struct{}
+}
+
+// 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))
+
+ // 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, 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, statusCode codes.Code, statusDesc string) 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()
+}
+
+// streamErrorf creates an StreamError with the specified error code and description.
+func streamErrorf(c codes.Code, format string, a ...interface{}) StreamError {
+ return StreamError{
+ Code: c,
+ Desc: fmt.Sprintf(format, a...),
+ }
+}
+
+// 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 by the server because
+ // the server stops accepting new RPCs.
+ ErrStreamDrain = streamErrorf(codes.Unavailable, "the server stops accepting new RPCs")
+)
+
+// StreamError is an error that only affects one stream within a connection.
+type StreamError struct {
+ Code codes.Code
+ Desc string
+}
+
+func (e StreamError) Error() string {
+ return fmt.Sprintf("stream error: code = %d desc = %q", e.Code, e.Desc)
+}
+
+// ContextErr converts the error from context package into a StreamError.
+func ContextErr(err error) StreamError {
+ switch err {
+ case context.DeadlineExceeded:
+ return streamErrorf(codes.DeadlineExceeded, "%v", err)
+ case context.Canceled:
+ return streamErrorf(codes.Canceled, "%v", err)
+ }
+ panic(fmt.Sprintf("Unexpected error from context packet: %v", err))
+}
+
+// wait blocks until it can receive from ctx.Done, closing, or proceed.
+// If it receives from ctx.Done, it returns 0, the StreamError for ctx.Err.
+// If it receives from done, it returns 0, io.EOF if ctx is not done; otherwise
+// it return the StreamError for ctx.Err.
+// If it receives from goAway, it returns 0, ErrStreamDrain.
+// If it receives from closing, it returns 0, ErrConnClosing.
+// If it receives from proceed, it returns the received integer, nil.
+func wait(ctx context.Context, done, goAway, closing <-chan struct{}, proceed <-chan int) (int, error) {
+ select {
+ case <-ctx.Done():
+ return 0, ContextErr(ctx.Err())
+ case <-done:
+ // User cancellation has precedence.
+ select {
+ case <-ctx.Done():
+ return 0, ContextErr(ctx.Err())
+ default:
+ }
+ return 0, io.EOF
+ case <-goAway:
+ return 0, ErrStreamDrain
+ case <-closing:
+ return 0, ErrConnClosing
+ case i := <-proceed:
+ return i, nil
+ }
+}