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stream.go
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stream.go
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/*
*
* 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"
"sync"
"time"
"context"
"grpc.go4.org/codes"
"grpc.go4.org/metadata"
"grpc.go4.org/stats"
"grpc.go4.org/transport"
"golang.org/x/net/trace"
)
// 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) {
return newClientStream(ctx, desc, cc, method, opts...)
}
func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
var cancel context.CancelFunc
c := defaultCallInfo
if mc, ok := cc.getMethodConfig(method); ok {
c.failFast = !mc.WaitForReady
if mc.Timeout > 0 {
ctx, cancel = context.WithTimeout(ctx, mc.Timeout)
}
}
_ = cancel
for _, o := range opts {
if err := o.before(&c); err != nil {
return nil, toRPCErr(err)
}
}
panic("TODO(bradfitz)")
flush := desc.ServerStreams && desc.ClientStreams
_ = flush
var compressAlg string
if cc.opts.cp != nil {
compressAlg = cc.opts.cp.Type()
}
_ = compressAlg
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()
}
}()
}
sh := cc.opts.statsHandler
if sh != nil {
ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method})
begin := &stats.Begin{
Client: true,
BeginTime: time.Now(),
FailFast: c.failFast,
}
sh.HandleRPC(ctx, begin)
}
defer func() {
if err != nil && sh != nil {
// Only handle end stats if err != nil.
end := &stats.End{
Client: true,
Error: err,
}
sh.HandleRPC(ctx, end)
}
}()
for {
//t, put, err = cc.getTransport(ctx)
panic("TODO")
if err != nil {
// TODO(zhaoq): Probably revisit the error handling.
if _, ok := err.(*rpcError); ok {
return nil, err
}
if false { // 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)
}
panic("TODO")
}
/*
cs := &clientStream{
opts: opts,
c: c,
desc: desc,
codec: cc.opts.codec,
cp: cc.opts.cp,
dc: cc.opts.dc,
cancel: cancel,
put: put,
t: t,
s: s,
p: &parser{r: s},
tracing: EnableTracing,
trInfo: trInfo,
statsCtx: ctx,
statsHandler: cc.opts.copts.StatsHandler,
}
if cc.opts.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
*/
}
// 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
statsHandler stats.Handler
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()
}
}()
var outPayload *stats.OutPayload
if ss.statsHandler != nil {
outPayload = &stats.OutPayload{}
}
out, err := encode(ss.codec, m, ss.cp, ss.cbuf, outPayload)
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)
}
if outPayload != nil {
outPayload.SentTime = time.Now()
ss.statsHandler.HandleRPC(ss.s.Context(), outPayload)
}
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()
}
}()
var inPayload *stats.InPayload
if ss.statsHandler != nil {
inPayload = &stats.InPayload{}
}
if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxMsgSize, inPayload); err != nil {
if err == io.EOF {
return err
}
if err == io.ErrUnexpectedEOF {
err = Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
}
return toRPCErr(err)
}
if inPayload != nil {
ss.statsHandler.HandleRPC(ss.s.Context(), inPayload)
}
return nil
}