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Diffstat (limited to 'vendor/google.golang.org/grpc')
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 + +[](https://travis-ci.org/grpc/grpc-go) [](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 := "aPool{ + 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 + } +} |