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Scott Bakere7144bc2019-10-01 14:16:47 -07001/*
2 *
3 * Copyright 2014 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19package grpc
20
21import (
22 "context"
23 "errors"
24 "io"
25 "math"
26 "strconv"
27 "sync"
28 "time"
29
30 "golang.org/x/net/trace"
31 "google.golang.org/grpc/balancer"
32 "google.golang.org/grpc/codes"
33 "google.golang.org/grpc/connectivity"
34 "google.golang.org/grpc/encoding"
35 "google.golang.org/grpc/grpclog"
36 "google.golang.org/grpc/internal/binarylog"
37 "google.golang.org/grpc/internal/channelz"
38 "google.golang.org/grpc/internal/grpcrand"
39 "google.golang.org/grpc/internal/transport"
40 "google.golang.org/grpc/metadata"
41 "google.golang.org/grpc/peer"
42 "google.golang.org/grpc/stats"
43 "google.golang.org/grpc/status"
44)
45
46// StreamHandler defines the handler called by gRPC server to complete the
47// execution of a streaming RPC. If a StreamHandler returns an error, it
48// should be produced by the status package, or else gRPC will use
49// codes.Unknown as the status code and err.Error() as the status message
50// of the RPC.
51type StreamHandler func(srv interface{}, stream ServerStream) error
52
53// StreamDesc represents a streaming RPC service's method specification.
54type StreamDesc struct {
55 StreamName string
56 Handler StreamHandler
57
58 // At least one of these is true.
59 ServerStreams bool
60 ClientStreams bool
61}
62
63// Stream defines the common interface a client or server stream has to satisfy.
64//
65// Deprecated: See ClientStream and ServerStream documentation instead.
66type Stream interface {
67 // Deprecated: See ClientStream and ServerStream documentation instead.
68 Context() context.Context
69 // Deprecated: See ClientStream and ServerStream documentation instead.
70 SendMsg(m interface{}) error
71 // Deprecated: See ClientStream and ServerStream documentation instead.
72 RecvMsg(m interface{}) error
73}
74
75// ClientStream defines the client-side behavior of a streaming RPC.
76//
77// All errors returned from ClientStream methods are compatible with the
78// status package.
79type ClientStream interface {
80 // Header returns the header metadata received from the server if there
81 // is any. It blocks if the metadata is not ready to read.
82 Header() (metadata.MD, error)
83 // Trailer returns the trailer metadata from the server, if there is any.
84 // It must only be called after stream.CloseAndRecv has returned, or
85 // stream.Recv has returned a non-nil error (including io.EOF).
86 Trailer() metadata.MD
87 // CloseSend closes the send direction of the stream. It closes the stream
88 // when non-nil error is met. It is also not safe to call CloseSend
89 // concurrently with SendMsg.
90 CloseSend() error
91 // Context returns the context for this stream.
92 //
93 // It should not be called until after Header or RecvMsg has returned. Once
94 // called, subsequent client-side retries are disabled.
95 Context() context.Context
96 // SendMsg is generally called by generated code. On error, SendMsg aborts
97 // the stream. If the error was generated by the client, the status is
98 // returned directly; otherwise, io.EOF is returned and the status of
99 // the stream may be discovered using RecvMsg.
100 //
101 // SendMsg blocks until:
102 // - There is sufficient flow control to schedule m with the transport, or
103 // - The stream is done, or
104 // - The stream breaks.
105 //
106 // SendMsg does not wait until the message is received by the server. An
107 // untimely stream closure may result in lost messages. To ensure delivery,
108 // users should ensure the RPC completed successfully using RecvMsg.
109 //
110 // It is safe to have a goroutine calling SendMsg and another goroutine
111 // calling RecvMsg on the same stream at the same time, but it is not safe
112 // to call SendMsg on the same stream in different goroutines. It is also
113 // not safe to call CloseSend concurrently with SendMsg.
114 SendMsg(m interface{}) error
115 // RecvMsg blocks until it receives a message into m or the stream is
116 // done. It returns io.EOF when the stream completes successfully. On
117 // any other error, the stream is aborted and the error contains the RPC
118 // status.
119 //
120 // It is safe to have a goroutine calling SendMsg and another goroutine
121 // calling RecvMsg on the same stream at the same time, but it is not
122 // safe to call RecvMsg on the same stream in different goroutines.
123 RecvMsg(m interface{}) error
124}
125
126// NewStream creates a new Stream for the client side. This is typically
127// called by generated code. ctx is used for the lifetime of the stream.
128//
129// To ensure resources are not leaked due to the stream returned, one of the following
130// actions must be performed:
131//
132// 1. Call Close on the ClientConn.
133// 2. Cancel the context provided.
134// 3. Call RecvMsg until a non-nil error is returned. A protobuf-generated
135// client-streaming RPC, for instance, might use the helper function
136// CloseAndRecv (note that CloseSend does not Recv, therefore is not
137// guaranteed to release all resources).
138// 4. Receive a non-nil, non-io.EOF error from Header or SendMsg.
139//
140// If none of the above happen, a goroutine and a context will be leaked, and grpc
141// will not call the optionally-configured stats handler with a stats.End message.
142func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
143 // allow interceptor to see all applicable call options, which means those
144 // configured as defaults from dial option as well as per-call options
145 opts = combine(cc.dopts.callOptions, opts)
146
147 if cc.dopts.streamInt != nil {
148 return cc.dopts.streamInt(ctx, desc, cc, method, newClientStream, opts...)
149 }
150 return newClientStream(ctx, desc, cc, method, opts...)
151}
152
153// NewClientStream is a wrapper for ClientConn.NewStream.
154func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error) {
155 return cc.NewStream(ctx, desc, method, opts...)
156}
157
158func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
159 if channelz.IsOn() {
160 cc.incrCallsStarted()
161 defer func() {
162 if err != nil {
163 cc.incrCallsFailed()
164 }
165 }()
166 }
167 c := defaultCallInfo()
168 // Provide an opportunity for the first RPC to see the first service config
169 // provided by the resolver.
170 if err := cc.waitForResolvedAddrs(ctx); err != nil {
171 return nil, err
172 }
173 mc := cc.GetMethodConfig(method)
174 if mc.WaitForReady != nil {
175 c.failFast = !*mc.WaitForReady
176 }
177
178 // Possible context leak:
179 // The cancel function for the child context we create will only be called
180 // when RecvMsg returns a non-nil error, if the ClientConn is closed, or if
181 // an error is generated by SendMsg.
182 // https://github.com/grpc/grpc-go/issues/1818.
183 var cancel context.CancelFunc
184 if mc.Timeout != nil && *mc.Timeout >= 0 {
185 ctx, cancel = context.WithTimeout(ctx, *mc.Timeout)
186 } else {
187 ctx, cancel = context.WithCancel(ctx)
188 }
189 defer func() {
190 if err != nil {
191 cancel()
192 }
193 }()
194
195 for _, o := range opts {
196 if err := o.before(c); err != nil {
197 return nil, toRPCErr(err)
198 }
199 }
200 c.maxSendMessageSize = getMaxSize(mc.MaxReqSize, c.maxSendMessageSize, defaultClientMaxSendMessageSize)
201 c.maxReceiveMessageSize = getMaxSize(mc.MaxRespSize, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)
202 if err := setCallInfoCodec(c); err != nil {
203 return nil, err
204 }
205
206 callHdr := &transport.CallHdr{
207 Host: cc.authority,
208 Method: method,
209 ContentSubtype: c.contentSubtype,
210 }
211
212 // Set our outgoing compression according to the UseCompressor CallOption, if
213 // set. In that case, also find the compressor from the encoding package.
214 // Otherwise, use the compressor configured by the WithCompressor DialOption,
215 // if set.
216 var cp Compressor
217 var comp encoding.Compressor
218 if ct := c.compressorType; ct != "" {
219 callHdr.SendCompress = ct
220 if ct != encoding.Identity {
221 comp = encoding.GetCompressor(ct)
222 if comp == nil {
223 return nil, status.Errorf(codes.Internal, "grpc: Compressor is not installed for requested grpc-encoding %q", ct)
224 }
225 }
226 } else if cc.dopts.cp != nil {
227 callHdr.SendCompress = cc.dopts.cp.Type()
228 cp = cc.dopts.cp
229 }
230 if c.creds != nil {
231 callHdr.Creds = c.creds
232 }
233 var trInfo traceInfo
234 if EnableTracing {
235 trInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
236 trInfo.firstLine.client = true
237 if deadline, ok := ctx.Deadline(); ok {
238 trInfo.firstLine.deadline = time.Until(deadline)
239 }
240 trInfo.tr.LazyLog(&trInfo.firstLine, false)
241 ctx = trace.NewContext(ctx, trInfo.tr)
242 }
243 ctx = newContextWithRPCInfo(ctx, c.failFast)
244 sh := cc.dopts.copts.StatsHandler
245 var beginTime time.Time
246 if sh != nil {
247 ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method, FailFast: c.failFast})
248 beginTime = time.Now()
249 begin := &stats.Begin{
250 Client: true,
251 BeginTime: beginTime,
252 FailFast: c.failFast,
253 }
254 sh.HandleRPC(ctx, begin)
255 }
256
257 cs := &clientStream{
258 callHdr: callHdr,
259 ctx: ctx,
260 methodConfig: &mc,
261 opts: opts,
262 callInfo: c,
263 cc: cc,
264 desc: desc,
265 codec: c.codec,
266 cp: cp,
267 comp: comp,
268 cancel: cancel,
269 beginTime: beginTime,
270 firstAttempt: true,
271 }
272 if !cc.dopts.disableRetry {
273 cs.retryThrottler = cc.retryThrottler.Load().(*retryThrottler)
274 }
275 cs.binlog = binarylog.GetMethodLogger(method)
276
277 cs.callInfo.stream = cs
278 // Only this initial attempt has stats/tracing.
279 // TODO(dfawley): move to newAttempt when per-attempt stats are implemented.
280 if err := cs.newAttemptLocked(sh, trInfo); err != nil {
281 cs.finish(err)
282 return nil, err
283 }
284
285 op := func(a *csAttempt) error { return a.newStream() }
286 if err := cs.withRetry(op, func() { cs.bufferForRetryLocked(0, op) }); err != nil {
287 cs.finish(err)
288 return nil, err
289 }
290
291 if cs.binlog != nil {
292 md, _ := metadata.FromOutgoingContext(ctx)
293 logEntry := &binarylog.ClientHeader{
294 OnClientSide: true,
295 Header: md,
296 MethodName: method,
297 Authority: cs.cc.authority,
298 }
299 if deadline, ok := ctx.Deadline(); ok {
300 logEntry.Timeout = time.Until(deadline)
301 if logEntry.Timeout < 0 {
302 logEntry.Timeout = 0
303 }
304 }
305 cs.binlog.Log(logEntry)
306 }
307
308 if desc != unaryStreamDesc {
309 // Listen on cc and stream contexts to cleanup when the user closes the
310 // ClientConn or cancels the stream context. In all other cases, an error
311 // should already be injected into the recv buffer by the transport, which
312 // the client will eventually receive, and then we will cancel the stream's
313 // context in clientStream.finish.
314 go func() {
315 select {
316 case <-cc.ctx.Done():
317 cs.finish(ErrClientConnClosing)
318 case <-ctx.Done():
319 cs.finish(toRPCErr(ctx.Err()))
320 }
321 }()
322 }
323 return cs, nil
324}
325
326func (cs *clientStream) newAttemptLocked(sh stats.Handler, trInfo traceInfo) error {
327 cs.attempt = &csAttempt{
328 cs: cs,
329 dc: cs.cc.dopts.dc,
330 statsHandler: sh,
331 trInfo: trInfo,
332 }
333
334 if err := cs.ctx.Err(); err != nil {
335 return toRPCErr(err)
336 }
337 t, done, err := cs.cc.getTransport(cs.ctx, cs.callInfo.failFast, cs.callHdr.Method)
338 if err != nil {
339 return err
340 }
341 cs.attempt.t = t
342 cs.attempt.done = done
343 return nil
344}
345
346func (a *csAttempt) newStream() error {
347 cs := a.cs
348 cs.callHdr.PreviousAttempts = cs.numRetries
349 s, err := a.t.NewStream(cs.ctx, cs.callHdr)
350 if err != nil {
351 return toRPCErr(err)
352 }
353 cs.attempt.s = s
354 cs.attempt.p = &parser{r: s}
355 return nil
356}
357
358// clientStream implements a client side Stream.
359type clientStream struct {
360 callHdr *transport.CallHdr
361 opts []CallOption
362 callInfo *callInfo
363 cc *ClientConn
364 desc *StreamDesc
365
366 codec baseCodec
367 cp Compressor
368 comp encoding.Compressor
369
370 cancel context.CancelFunc // cancels all attempts
371
372 sentLast bool // sent an end stream
373 beginTime time.Time
374
375 methodConfig *MethodConfig
376
377 ctx context.Context // the application's context, wrapped by stats/tracing
378
379 retryThrottler *retryThrottler // The throttler active when the RPC began.
380
381 binlog *binarylog.MethodLogger // Binary logger, can be nil.
382 // serverHeaderBinlogged is a boolean for whether server header has been
383 // logged. Server header will be logged when the first time one of those
384 // happens: stream.Header(), stream.Recv().
385 //
386 // It's only read and used by Recv() and Header(), so it doesn't need to be
387 // synchronized.
388 serverHeaderBinlogged bool
389
390 mu sync.Mutex
391 firstAttempt bool // if true, transparent retry is valid
392 numRetries int // exclusive of transparent retry attempt(s)
393 numRetriesSincePushback int // retries since pushback; to reset backoff
394 finished bool // TODO: replace with atomic cmpxchg or sync.Once?
395 attempt *csAttempt // the active client stream attempt
396 // TODO(hedging): hedging will have multiple attempts simultaneously.
397 committed bool // active attempt committed for retry?
398 buffer []func(a *csAttempt) error // operations to replay on retry
399 bufferSize int // current size of buffer
400}
401
402// csAttempt implements a single transport stream attempt within a
403// clientStream.
404type csAttempt struct {
405 cs *clientStream
406 t transport.ClientTransport
407 s *transport.Stream
408 p *parser
409 done func(balancer.DoneInfo)
410
411 finished bool
412 dc Decompressor
413 decomp encoding.Compressor
414 decompSet bool
415
416 mu sync.Mutex // guards trInfo.tr
417 // trInfo.tr is set when created (if EnableTracing is true),
418 // and cleared when the finish method is called.
419 trInfo traceInfo
420
421 statsHandler stats.Handler
422}
423
424func (cs *clientStream) commitAttemptLocked() {
425 cs.committed = true
426 cs.buffer = nil
427}
428
429func (cs *clientStream) commitAttempt() {
430 cs.mu.Lock()
431 cs.commitAttemptLocked()
432 cs.mu.Unlock()
433}
434
435// shouldRetry returns nil if the RPC should be retried; otherwise it returns
436// the error that should be returned by the operation.
437func (cs *clientStream) shouldRetry(err error) error {
438 if cs.attempt.s == nil && !cs.callInfo.failFast {
439 // In the event of any error from NewStream (attempt.s == nil), we
440 // never attempted to write anything to the wire, so we can retry
441 // indefinitely for non-fail-fast RPCs.
442 return nil
443 }
444 if cs.finished || cs.committed {
445 // RPC is finished or committed; cannot retry.
446 return err
447 }
448 // Wait for the trailers.
449 if cs.attempt.s != nil {
450 <-cs.attempt.s.Done()
451 }
452 if cs.firstAttempt && !cs.callInfo.failFast && (cs.attempt.s == nil || cs.attempt.s.Unprocessed()) {
453 // First attempt, wait-for-ready, stream unprocessed: transparently retry.
454 cs.firstAttempt = false
455 return nil
456 }
457 cs.firstAttempt = false
458 if cs.cc.dopts.disableRetry {
459 return err
460 }
461
462 pushback := 0
463 hasPushback := false
464 if cs.attempt.s != nil {
465 if to, toErr := cs.attempt.s.TrailersOnly(); toErr != nil || !to {
466 return err
467 }
468
469 // TODO(retry): Move down if the spec changes to not check server pushback
470 // before considering this a failure for throttling.
471 sps := cs.attempt.s.Trailer()["grpc-retry-pushback-ms"]
472 if len(sps) == 1 {
473 var e error
474 if pushback, e = strconv.Atoi(sps[0]); e != nil || pushback < 0 {
475 grpclog.Infof("Server retry pushback specified to abort (%q).", sps[0])
476 cs.retryThrottler.throttle() // This counts as a failure for throttling.
477 return err
478 }
479 hasPushback = true
480 } else if len(sps) > 1 {
481 grpclog.Warningf("Server retry pushback specified multiple values (%q); not retrying.", sps)
482 cs.retryThrottler.throttle() // This counts as a failure for throttling.
483 return err
484 }
485 }
486
487 var code codes.Code
488 if cs.attempt.s != nil {
489 code = cs.attempt.s.Status().Code()
490 } else {
491 code = status.Convert(err).Code()
492 }
493
494 rp := cs.methodConfig.retryPolicy
495 if rp == nil || !rp.retryableStatusCodes[code] {
496 return err
497 }
498
499 // Note: the ordering here is important; we count this as a failure
500 // only if the code matched a retryable code.
501 if cs.retryThrottler.throttle() {
502 return err
503 }
504 if cs.numRetries+1 >= rp.maxAttempts {
505 return err
506 }
507
508 var dur time.Duration
509 if hasPushback {
510 dur = time.Millisecond * time.Duration(pushback)
511 cs.numRetriesSincePushback = 0
512 } else {
513 fact := math.Pow(rp.backoffMultiplier, float64(cs.numRetriesSincePushback))
514 cur := float64(rp.initialBackoff) * fact
515 if max := float64(rp.maxBackoff); cur > max {
516 cur = max
517 }
518 dur = time.Duration(grpcrand.Int63n(int64(cur)))
519 cs.numRetriesSincePushback++
520 }
521
522 // TODO(dfawley): we could eagerly fail here if dur puts us past the
523 // deadline, but unsure if it is worth doing.
524 t := time.NewTimer(dur)
525 select {
526 case <-t.C:
527 cs.numRetries++
528 return nil
529 case <-cs.ctx.Done():
530 t.Stop()
531 return status.FromContextError(cs.ctx.Err()).Err()
532 }
533}
534
535// Returns nil if a retry was performed and succeeded; error otherwise.
536func (cs *clientStream) retryLocked(lastErr error) error {
537 for {
538 cs.attempt.finish(lastErr)
539 if err := cs.shouldRetry(lastErr); err != nil {
540 cs.commitAttemptLocked()
541 return err
542 }
543 if err := cs.newAttemptLocked(nil, traceInfo{}); err != nil {
544 return err
545 }
546 if lastErr = cs.replayBufferLocked(); lastErr == nil {
547 return nil
548 }
549 }
550}
551
552func (cs *clientStream) Context() context.Context {
553 cs.commitAttempt()
554 // No need to lock before using attempt, since we know it is committed and
555 // cannot change.
556 return cs.attempt.s.Context()
557}
558
559func (cs *clientStream) withRetry(op func(a *csAttempt) error, onSuccess func()) error {
560 cs.mu.Lock()
561 for {
562 if cs.committed {
563 cs.mu.Unlock()
564 return op(cs.attempt)
565 }
566 a := cs.attempt
567 cs.mu.Unlock()
568 err := op(a)
569 cs.mu.Lock()
570 if a != cs.attempt {
571 // We started another attempt already.
572 continue
573 }
574 if err == io.EOF {
575 <-a.s.Done()
576 }
577 if err == nil || (err == io.EOF && a.s.Status().Code() == codes.OK) {
578 onSuccess()
579 cs.mu.Unlock()
580 return err
581 }
582 if err := cs.retryLocked(err); err != nil {
583 cs.mu.Unlock()
584 return err
585 }
586 }
587}
588
589func (cs *clientStream) Header() (metadata.MD, error) {
590 var m metadata.MD
591 err := cs.withRetry(func(a *csAttempt) error {
592 var err error
593 m, err = a.s.Header()
594 return toRPCErr(err)
595 }, cs.commitAttemptLocked)
596 if err != nil {
597 cs.finish(err)
598 return nil, err
599 }
600 if cs.binlog != nil && !cs.serverHeaderBinlogged {
601 // Only log if binary log is on and header has not been logged.
602 logEntry := &binarylog.ServerHeader{
603 OnClientSide: true,
604 Header: m,
605 PeerAddr: nil,
606 }
607 if peer, ok := peer.FromContext(cs.Context()); ok {
608 logEntry.PeerAddr = peer.Addr
609 }
610 cs.binlog.Log(logEntry)
611 cs.serverHeaderBinlogged = true
612 }
613 return m, err
614}
615
616func (cs *clientStream) Trailer() metadata.MD {
617 // On RPC failure, we never need to retry, because usage requires that
618 // RecvMsg() returned a non-nil error before calling this function is valid.
619 // We would have retried earlier if necessary.
620 //
621 // Commit the attempt anyway, just in case users are not following those
622 // directions -- it will prevent races and should not meaningfully impact
623 // performance.
624 cs.commitAttempt()
625 if cs.attempt.s == nil {
626 return nil
627 }
628 return cs.attempt.s.Trailer()
629}
630
631func (cs *clientStream) replayBufferLocked() error {
632 a := cs.attempt
633 for _, f := range cs.buffer {
634 if err := f(a); err != nil {
635 return err
636 }
637 }
638 return nil
639}
640
641func (cs *clientStream) bufferForRetryLocked(sz int, op func(a *csAttempt) error) {
642 // Note: we still will buffer if retry is disabled (for transparent retries).
643 if cs.committed {
644 return
645 }
646 cs.bufferSize += sz
647 if cs.bufferSize > cs.callInfo.maxRetryRPCBufferSize {
648 cs.commitAttemptLocked()
649 return
650 }
651 cs.buffer = append(cs.buffer, op)
652}
653
654func (cs *clientStream) SendMsg(m interface{}) (err error) {
655 defer func() {
656 if err != nil && err != io.EOF {
657 // Call finish on the client stream for errors generated by this SendMsg
658 // call, as these indicate problems created by this client. (Transport
659 // errors are converted to an io.EOF error in csAttempt.sendMsg; the real
660 // error will be returned from RecvMsg eventually in that case, or be
661 // retried.)
662 cs.finish(err)
663 }
664 }()
665 if cs.sentLast {
666 return status.Errorf(codes.Internal, "SendMsg called after CloseSend")
667 }
668 if !cs.desc.ClientStreams {
669 cs.sentLast = true
670 }
671 data, err := encode(cs.codec, m)
672 if err != nil {
673 return err
674 }
675 compData, err := compress(data, cs.cp, cs.comp)
676 if err != nil {
677 return err
678 }
679 hdr, payload := msgHeader(data, compData)
680 // TODO(dfawley): should we be checking len(data) instead?
681 if len(payload) > *cs.callInfo.maxSendMessageSize {
682 return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payload), *cs.callInfo.maxSendMessageSize)
683 }
684 msgBytes := data // Store the pointer before setting to nil. For binary logging.
685 op := func(a *csAttempt) error {
686 err := a.sendMsg(m, hdr, payload, data)
687 // nil out the message and uncomp when replaying; they are only needed for
688 // stats which is disabled for subsequent attempts.
689 m, data = nil, nil
690 return err
691 }
692 err = cs.withRetry(op, func() { cs.bufferForRetryLocked(len(hdr)+len(payload), op) })
693 if cs.binlog != nil && err == nil {
694 cs.binlog.Log(&binarylog.ClientMessage{
695 OnClientSide: true,
696 Message: msgBytes,
697 })
698 }
699 return
700}
701
702func (cs *clientStream) RecvMsg(m interface{}) error {
703 if cs.binlog != nil && !cs.serverHeaderBinlogged {
704 // Call Header() to binary log header if it's not already logged.
705 cs.Header()
706 }
707 var recvInfo *payloadInfo
708 if cs.binlog != nil {
709 recvInfo = &payloadInfo{}
710 }
711 err := cs.withRetry(func(a *csAttempt) error {
712 return a.recvMsg(m, recvInfo)
713 }, cs.commitAttemptLocked)
714 if cs.binlog != nil && err == nil {
715 cs.binlog.Log(&binarylog.ServerMessage{
716 OnClientSide: true,
717 Message: recvInfo.uncompressedBytes,
718 })
719 }
720 if err != nil || !cs.desc.ServerStreams {
721 // err != nil or non-server-streaming indicates end of stream.
722 cs.finish(err)
723
724 if cs.binlog != nil {
725 // finish will not log Trailer. Log Trailer here.
726 logEntry := &binarylog.ServerTrailer{
727 OnClientSide: true,
728 Trailer: cs.Trailer(),
729 Err: err,
730 }
731 if logEntry.Err == io.EOF {
732 logEntry.Err = nil
733 }
734 if peer, ok := peer.FromContext(cs.Context()); ok {
735 logEntry.PeerAddr = peer.Addr
736 }
737 cs.binlog.Log(logEntry)
738 }
739 }
740 return err
741}
742
743func (cs *clientStream) CloseSend() error {
744 if cs.sentLast {
745 // TODO: return an error and finish the stream instead, due to API misuse?
746 return nil
747 }
748 cs.sentLast = true
749 op := func(a *csAttempt) error {
750 a.t.Write(a.s, nil, nil, &transport.Options{Last: true})
751 // Always return nil; io.EOF is the only error that might make sense
752 // instead, but there is no need to signal the client to call RecvMsg
753 // as the only use left for the stream after CloseSend is to call
754 // RecvMsg. This also matches historical behavior.
755 return nil
756 }
757 cs.withRetry(op, func() { cs.bufferForRetryLocked(0, op) })
758 if cs.binlog != nil {
759 cs.binlog.Log(&binarylog.ClientHalfClose{
760 OnClientSide: true,
761 })
762 }
763 // We never returned an error here for reasons.
764 return nil
765}
766
767func (cs *clientStream) finish(err error) {
768 if err == io.EOF {
769 // Ending a stream with EOF indicates a success.
770 err = nil
771 }
772 cs.mu.Lock()
773 if cs.finished {
774 cs.mu.Unlock()
775 return
776 }
777 cs.finished = true
778 cs.commitAttemptLocked()
779 cs.mu.Unlock()
780 // For binary logging. only log cancel in finish (could be caused by RPC ctx
781 // canceled or ClientConn closed). Trailer will be logged in RecvMsg.
782 //
783 // Only one of cancel or trailer needs to be logged. In the cases where
784 // users don't call RecvMsg, users must have already canceled the RPC.
785 if cs.binlog != nil && status.Code(err) == codes.Canceled {
786 cs.binlog.Log(&binarylog.Cancel{
787 OnClientSide: true,
788 })
789 }
790 if err == nil {
791 cs.retryThrottler.successfulRPC()
792 }
793 if channelz.IsOn() {
794 if err != nil {
795 cs.cc.incrCallsFailed()
796 } else {
797 cs.cc.incrCallsSucceeded()
798 }
799 }
800 if cs.attempt != nil {
801 cs.attempt.finish(err)
802 }
803 // after functions all rely upon having a stream.
804 if cs.attempt.s != nil {
805 for _, o := range cs.opts {
806 o.after(cs.callInfo)
807 }
808 }
809 cs.cancel()
810}
811
812func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
813 cs := a.cs
814 if EnableTracing {
815 a.mu.Lock()
816 if a.trInfo.tr != nil {
817 a.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
818 }
819 a.mu.Unlock()
820 }
821 if err := a.t.Write(a.s, hdr, payld, &transport.Options{Last: !cs.desc.ClientStreams}); err != nil {
822 if !cs.desc.ClientStreams {
823 // For non-client-streaming RPCs, we return nil instead of EOF on error
824 // because the generated code requires it. finish is not called; RecvMsg()
825 // will call it with the stream's status independently.
826 return nil
827 }
828 return io.EOF
829 }
830 if a.statsHandler != nil {
831 a.statsHandler.HandleRPC(cs.ctx, outPayload(true, m, data, payld, time.Now()))
832 }
833 if channelz.IsOn() {
834 a.t.IncrMsgSent()
835 }
836 return nil
837}
838
839func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
840 cs := a.cs
841 if a.statsHandler != nil && payInfo == nil {
842 payInfo = &payloadInfo{}
843 }
844
845 if !a.decompSet {
846 // Block until we receive headers containing received message encoding.
847 if ct := a.s.RecvCompress(); ct != "" && ct != encoding.Identity {
848 if a.dc == nil || a.dc.Type() != ct {
849 // No configured decompressor, or it does not match the incoming
850 // message encoding; attempt to find a registered compressor that does.
851 a.dc = nil
852 a.decomp = encoding.GetCompressor(ct)
853 }
854 } else {
855 // No compression is used; disable our decompressor.
856 a.dc = nil
857 }
858 // Only initialize this state once per stream.
859 a.decompSet = true
860 }
861 err = recv(a.p, cs.codec, a.s, a.dc, m, *cs.callInfo.maxReceiveMessageSize, payInfo, a.decomp)
862 if err != nil {
863 if err == io.EOF {
864 if statusErr := a.s.Status().Err(); statusErr != nil {
865 return statusErr
866 }
867 return io.EOF // indicates successful end of stream.
868 }
869 return toRPCErr(err)
870 }
871 if EnableTracing {
872 a.mu.Lock()
873 if a.trInfo.tr != nil {
874 a.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
875 }
876 a.mu.Unlock()
877 }
878 if a.statsHandler != nil {
879 a.statsHandler.HandleRPC(cs.ctx, &stats.InPayload{
880 Client: true,
881 RecvTime: time.Now(),
882 Payload: m,
883 // TODO truncate large payload.
884 Data: payInfo.uncompressedBytes,
885 Length: len(payInfo.uncompressedBytes),
886 })
887 }
888 if channelz.IsOn() {
889 a.t.IncrMsgRecv()
890 }
891 if cs.desc.ServerStreams {
892 // Subsequent messages should be received by subsequent RecvMsg calls.
893 return nil
894 }
895 // Special handling for non-server-stream rpcs.
896 // This recv expects EOF or errors, so we don't collect inPayload.
897 err = recv(a.p, cs.codec, a.s, a.dc, m, *cs.callInfo.maxReceiveMessageSize, nil, a.decomp)
898 if err == nil {
899 return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
900 }
901 if err == io.EOF {
902 return a.s.Status().Err() // non-server streaming Recv returns nil on success
903 }
904 return toRPCErr(err)
905}
906
907func (a *csAttempt) finish(err error) {
908 a.mu.Lock()
909 if a.finished {
910 a.mu.Unlock()
911 return
912 }
913 a.finished = true
914 if err == io.EOF {
915 // Ending a stream with EOF indicates a success.
916 err = nil
917 }
918 if a.s != nil {
919 a.t.CloseStream(a.s, err)
920 }
921
922 if a.done != nil {
923 br := false
924 var tr metadata.MD
925 if a.s != nil {
926 br = a.s.BytesReceived()
927 tr = a.s.Trailer()
928 }
929 a.done(balancer.DoneInfo{
930 Err: err,
931 Trailer: tr,
932 BytesSent: a.s != nil,
933 BytesReceived: br,
934 })
935 }
936 if a.statsHandler != nil {
937 end := &stats.End{
938 Client: true,
939 BeginTime: a.cs.beginTime,
940 EndTime: time.Now(),
941 Error: err,
942 }
943 a.statsHandler.HandleRPC(a.cs.ctx, end)
944 }
945 if a.trInfo.tr != nil {
946 if err == nil {
947 a.trInfo.tr.LazyPrintf("RPC: [OK]")
948 } else {
949 a.trInfo.tr.LazyPrintf("RPC: [%v]", err)
950 a.trInfo.tr.SetError()
951 }
952 a.trInfo.tr.Finish()
953 a.trInfo.tr = nil
954 }
955 a.mu.Unlock()
956}
957
958func (ac *addrConn) newClientStream(ctx context.Context, desc *StreamDesc, method string, t transport.ClientTransport, opts ...CallOption) (_ ClientStream, err error) {
959 ac.mu.Lock()
960 if ac.transport != t {
961 ac.mu.Unlock()
962 return nil, status.Error(codes.Canceled, "the provided transport is no longer valid to use")
963 }
964 // transition to CONNECTING state when an attempt starts
965 if ac.state != connectivity.Connecting {
966 ac.updateConnectivityState(connectivity.Connecting)
967 ac.cc.handleSubConnStateChange(ac.acbw, ac.state)
968 }
969 ac.mu.Unlock()
970
971 if t == nil {
972 // TODO: return RPC error here?
973 return nil, errors.New("transport provided is nil")
974 }
975 // defaultCallInfo contains unnecessary info(i.e. failfast, maxRetryRPCBufferSize), so we just initialize an empty struct.
976 c := &callInfo{}
977
978 for _, o := range opts {
979 if err := o.before(c); err != nil {
980 return nil, toRPCErr(err)
981 }
982 }
983 c.maxReceiveMessageSize = getMaxSize(nil, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)
984 c.maxSendMessageSize = getMaxSize(nil, c.maxSendMessageSize, defaultServerMaxSendMessageSize)
985
986 // Possible context leak:
987 // The cancel function for the child context we create will only be called
988 // when RecvMsg returns a non-nil error, if the ClientConn is closed, or if
989 // an error is generated by SendMsg.
990 // https://github.com/grpc/grpc-go/issues/1818.
991 ctx, cancel := context.WithCancel(ctx)
992 defer func() {
993 if err != nil {
994 cancel()
995 }
996 }()
997
998 if err := setCallInfoCodec(c); err != nil {
999 return nil, err
1000 }
1001
1002 callHdr := &transport.CallHdr{
1003 Host: ac.cc.authority,
1004 Method: method,
1005 ContentSubtype: c.contentSubtype,
1006 }
1007
1008 // Set our outgoing compression according to the UseCompressor CallOption, if
1009 // set. In that case, also find the compressor from the encoding package.
1010 // Otherwise, use the compressor configured by the WithCompressor DialOption,
1011 // if set.
1012 var cp Compressor
1013 var comp encoding.Compressor
1014 if ct := c.compressorType; ct != "" {
1015 callHdr.SendCompress = ct
1016 if ct != encoding.Identity {
1017 comp = encoding.GetCompressor(ct)
1018 if comp == nil {
1019 return nil, status.Errorf(codes.Internal, "grpc: Compressor is not installed for requested grpc-encoding %q", ct)
1020 }
1021 }
1022 } else if ac.cc.dopts.cp != nil {
1023 callHdr.SendCompress = ac.cc.dopts.cp.Type()
1024 cp = ac.cc.dopts.cp
1025 }
1026 if c.creds != nil {
1027 callHdr.Creds = c.creds
1028 }
1029
1030 as := &addrConnStream{
1031 callHdr: callHdr,
1032 ac: ac,
1033 ctx: ctx,
1034 cancel: cancel,
1035 opts: opts,
1036 callInfo: c,
1037 desc: desc,
1038 codec: c.codec,
1039 cp: cp,
1040 comp: comp,
1041 t: t,
1042 }
1043
1044 as.callInfo.stream = as
1045 s, err := as.t.NewStream(as.ctx, as.callHdr)
1046 if err != nil {
1047 err = toRPCErr(err)
1048 return nil, err
1049 }
1050 as.s = s
1051 as.p = &parser{r: s}
1052 ac.incrCallsStarted()
1053 if desc != unaryStreamDesc {
1054 // Listen on cc and stream contexts to cleanup when the user closes the
1055 // ClientConn or cancels the stream context. In all other cases, an error
1056 // should already be injected into the recv buffer by the transport, which
1057 // the client will eventually receive, and then we will cancel the stream's
1058 // context in clientStream.finish.
1059 go func() {
1060 select {
1061 case <-ac.ctx.Done():
1062 as.finish(status.Error(codes.Canceled, "grpc: the SubConn is closing"))
1063 case <-ctx.Done():
1064 as.finish(toRPCErr(ctx.Err()))
1065 }
1066 }()
1067 }
1068 return as, nil
1069}
1070
1071type addrConnStream struct {
1072 s *transport.Stream
1073 ac *addrConn
1074 callHdr *transport.CallHdr
1075 cancel context.CancelFunc
1076 opts []CallOption
1077 callInfo *callInfo
1078 t transport.ClientTransport
1079 ctx context.Context
1080 sentLast bool
1081 desc *StreamDesc
1082 codec baseCodec
1083 cp Compressor
1084 comp encoding.Compressor
1085 decompSet bool
1086 dc Decompressor
1087 decomp encoding.Compressor
1088 p *parser
1089 mu sync.Mutex
1090 finished bool
1091}
1092
1093func (as *addrConnStream) Header() (metadata.MD, error) {
1094 m, err := as.s.Header()
1095 if err != nil {
1096 as.finish(toRPCErr(err))
1097 }
1098 return m, err
1099}
1100
1101func (as *addrConnStream) Trailer() metadata.MD {
1102 return as.s.Trailer()
1103}
1104
1105func (as *addrConnStream) CloseSend() error {
1106 if as.sentLast {
1107 // TODO: return an error and finish the stream instead, due to API misuse?
1108 return nil
1109 }
1110 as.sentLast = true
1111
1112 as.t.Write(as.s, nil, nil, &transport.Options{Last: true})
1113 // Always return nil; io.EOF is the only error that might make sense
1114 // instead, but there is no need to signal the client to call RecvMsg
1115 // as the only use left for the stream after CloseSend is to call
1116 // RecvMsg. This also matches historical behavior.
1117 return nil
1118}
1119
1120func (as *addrConnStream) Context() context.Context {
1121 return as.s.Context()
1122}
1123
1124func (as *addrConnStream) SendMsg(m interface{}) (err error) {
1125 defer func() {
1126 if err != nil && err != io.EOF {
1127 // Call finish on the client stream for errors generated by this SendMsg
1128 // call, as these indicate problems created by this client. (Transport
1129 // errors are converted to an io.EOF error in csAttempt.sendMsg; the real
1130 // error will be returned from RecvMsg eventually in that case, or be
1131 // retried.)
1132 as.finish(err)
1133 }
1134 }()
1135 if as.sentLast {
1136 return status.Errorf(codes.Internal, "SendMsg called after CloseSend")
1137 }
1138 if !as.desc.ClientStreams {
1139 as.sentLast = true
1140 }
1141 data, err := encode(as.codec, m)
1142 if err != nil {
1143 return err
1144 }
1145 compData, err := compress(data, as.cp, as.comp)
1146 if err != nil {
1147 return err
1148 }
1149 hdr, payld := msgHeader(data, compData)
1150 // TODO(dfawley): should we be checking len(data) instead?
1151 if len(payld) > *as.callInfo.maxSendMessageSize {
1152 return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payld), *as.callInfo.maxSendMessageSize)
1153 }
1154
1155 if err := as.t.Write(as.s, hdr, payld, &transport.Options{Last: !as.desc.ClientStreams}); err != nil {
1156 if !as.desc.ClientStreams {
1157 // For non-client-streaming RPCs, we return nil instead of EOF on error
1158 // because the generated code requires it. finish is not called; RecvMsg()
1159 // will call it with the stream's status independently.
1160 return nil
1161 }
1162 return io.EOF
1163 }
1164
1165 if channelz.IsOn() {
1166 as.t.IncrMsgSent()
1167 }
1168 return nil
1169}
1170
1171func (as *addrConnStream) RecvMsg(m interface{}) (err error) {
1172 defer func() {
1173 if err != nil || !as.desc.ServerStreams {
1174 // err != nil or non-server-streaming indicates end of stream.
1175 as.finish(err)
1176 }
1177 }()
1178
1179 if !as.decompSet {
1180 // Block until we receive headers containing received message encoding.
1181 if ct := as.s.RecvCompress(); ct != "" && ct != encoding.Identity {
1182 if as.dc == nil || as.dc.Type() != ct {
1183 // No configured decompressor, or it does not match the incoming
1184 // message encoding; attempt to find a registered compressor that does.
1185 as.dc = nil
1186 as.decomp = encoding.GetCompressor(ct)
1187 }
1188 } else {
1189 // No compression is used; disable our decompressor.
1190 as.dc = nil
1191 }
1192 // Only initialize this state once per stream.
1193 as.decompSet = true
1194 }
1195 err = recv(as.p, as.codec, as.s, as.dc, m, *as.callInfo.maxReceiveMessageSize, nil, as.decomp)
1196 if err != nil {
1197 if err == io.EOF {
1198 if statusErr := as.s.Status().Err(); statusErr != nil {
1199 return statusErr
1200 }
1201 return io.EOF // indicates successful end of stream.
1202 }
1203 return toRPCErr(err)
1204 }
1205
1206 if channelz.IsOn() {
1207 as.t.IncrMsgRecv()
1208 }
1209 if as.desc.ServerStreams {
1210 // Subsequent messages should be received by subsequent RecvMsg calls.
1211 return nil
1212 }
1213
1214 // Special handling for non-server-stream rpcs.
1215 // This recv expects EOF or errors, so we don't collect inPayload.
1216 err = recv(as.p, as.codec, as.s, as.dc, m, *as.callInfo.maxReceiveMessageSize, nil, as.decomp)
1217 if err == nil {
1218 return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
1219 }
1220 if err == io.EOF {
1221 return as.s.Status().Err() // non-server streaming Recv returns nil on success
1222 }
1223 return toRPCErr(err)
1224}
1225
1226func (as *addrConnStream) finish(err error) {
1227 as.mu.Lock()
1228 if as.finished {
1229 as.mu.Unlock()
1230 return
1231 }
1232 as.finished = true
1233 if err == io.EOF {
1234 // Ending a stream with EOF indicates a success.
1235 err = nil
1236 }
1237 if as.s != nil {
1238 as.t.CloseStream(as.s, err)
1239 }
1240
1241 if err != nil {
1242 as.ac.incrCallsFailed()
1243 } else {
1244 as.ac.incrCallsSucceeded()
1245 }
1246 as.cancel()
1247 as.mu.Unlock()
1248}
1249
1250// ServerStream defines the server-side behavior of a streaming RPC.
1251//
1252// All errors returned from ServerStream methods are compatible with the
1253// status package.
1254type ServerStream interface {
1255 // SetHeader sets the header metadata. It may be called multiple times.
1256 // When call multiple times, all the provided metadata will be merged.
1257 // All the metadata will be sent out when one of the following happens:
1258 // - ServerStream.SendHeader() is called;
1259 // - The first response is sent out;
1260 // - An RPC status is sent out (error or success).
1261 SetHeader(metadata.MD) error
1262 // SendHeader sends the header metadata.
1263 // The provided md and headers set by SetHeader() will be sent.
1264 // It fails if called multiple times.
1265 SendHeader(metadata.MD) error
1266 // SetTrailer sets the trailer metadata which will be sent with the RPC status.
1267 // When called more than once, all the provided metadata will be merged.
1268 SetTrailer(metadata.MD)
1269 // Context returns the context for this stream.
1270 Context() context.Context
1271 // SendMsg sends a message. On error, SendMsg aborts the stream and the
1272 // error is returned directly.
1273 //
1274 // SendMsg blocks until:
1275 // - There is sufficient flow control to schedule m with the transport, or
1276 // - The stream is done, or
1277 // - The stream breaks.
1278 //
1279 // SendMsg does not wait until the message is received by the client. An
1280 // untimely stream closure may result in lost messages.
1281 //
1282 // It is safe to have a goroutine calling SendMsg and another goroutine
1283 // calling RecvMsg on the same stream at the same time, but it is not safe
1284 // to call SendMsg on the same stream in different goroutines.
1285 SendMsg(m interface{}) error
1286 // RecvMsg blocks until it receives a message into m or the stream is
1287 // done. It returns io.EOF when the client has performed a CloseSend. On
1288 // any non-EOF error, the stream is aborted and the error contains the
1289 // RPC status.
1290 //
1291 // It is safe to have a goroutine calling SendMsg and another goroutine
1292 // calling RecvMsg on the same stream at the same time, but it is not
1293 // safe to call RecvMsg on the same stream in different goroutines.
1294 RecvMsg(m interface{}) error
1295}
1296
1297// serverStream implements a server side Stream.
1298type serverStream struct {
1299 ctx context.Context
1300 t transport.ServerTransport
1301 s *transport.Stream
1302 p *parser
1303 codec baseCodec
1304
1305 cp Compressor
1306 dc Decompressor
1307 comp encoding.Compressor
1308 decomp encoding.Compressor
1309
1310 maxReceiveMessageSize int
1311 maxSendMessageSize int
1312 trInfo *traceInfo
1313
1314 statsHandler stats.Handler
1315
1316 binlog *binarylog.MethodLogger
1317 // serverHeaderBinlogged indicates whether server header has been logged. It
1318 // will happen when one of the following two happens: stream.SendHeader(),
1319 // stream.Send().
1320 //
1321 // It's only checked in send and sendHeader, doesn't need to be
1322 // synchronized.
1323 serverHeaderBinlogged bool
1324
1325 mu sync.Mutex // protects trInfo.tr after the service handler runs.
1326}
1327
1328func (ss *serverStream) Context() context.Context {
1329 return ss.ctx
1330}
1331
1332func (ss *serverStream) SetHeader(md metadata.MD) error {
1333 if md.Len() == 0 {
1334 return nil
1335 }
1336 return ss.s.SetHeader(md)
1337}
1338
1339func (ss *serverStream) SendHeader(md metadata.MD) error {
1340 err := ss.t.WriteHeader(ss.s, md)
1341 if ss.binlog != nil && !ss.serverHeaderBinlogged {
1342 h, _ := ss.s.Header()
1343 ss.binlog.Log(&binarylog.ServerHeader{
1344 Header: h,
1345 })
1346 ss.serverHeaderBinlogged = true
1347 }
1348 return err
1349}
1350
1351func (ss *serverStream) SetTrailer(md metadata.MD) {
1352 if md.Len() == 0 {
1353 return
1354 }
1355 ss.s.SetTrailer(md)
1356}
1357
1358func (ss *serverStream) SendMsg(m interface{}) (err error) {
1359 defer func() {
1360 if ss.trInfo != nil {
1361 ss.mu.Lock()
1362 if ss.trInfo.tr != nil {
1363 if err == nil {
1364 ss.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
1365 } else {
1366 ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
1367 ss.trInfo.tr.SetError()
1368 }
1369 }
1370 ss.mu.Unlock()
1371 }
1372 if err != nil && err != io.EOF {
1373 st, _ := status.FromError(toRPCErr(err))
1374 ss.t.WriteStatus(ss.s, st)
1375 // Non-user specified status was sent out. This should be an error
1376 // case (as a server side Cancel maybe).
1377 //
1378 // This is not handled specifically now. User will return a final
1379 // status from the service handler, we will log that error instead.
1380 // This behavior is similar to an interceptor.
1381 }
1382 if channelz.IsOn() && err == nil {
1383 ss.t.IncrMsgSent()
1384 }
1385 }()
1386 data, err := encode(ss.codec, m)
1387 if err != nil {
1388 return err
1389 }
1390 compData, err := compress(data, ss.cp, ss.comp)
1391 if err != nil {
1392 return err
1393 }
1394 hdr, payload := msgHeader(data, compData)
1395 // TODO(dfawley): should we be checking len(data) instead?
1396 if len(payload) > ss.maxSendMessageSize {
1397 return status.Errorf(codes.ResourceExhausted, "trying to send message larger than max (%d vs. %d)", len(payload), ss.maxSendMessageSize)
1398 }
1399 if err := ss.t.Write(ss.s, hdr, payload, &transport.Options{Last: false}); err != nil {
1400 return toRPCErr(err)
1401 }
1402 if ss.binlog != nil {
1403 if !ss.serverHeaderBinlogged {
1404 h, _ := ss.s.Header()
1405 ss.binlog.Log(&binarylog.ServerHeader{
1406 Header: h,
1407 })
1408 ss.serverHeaderBinlogged = true
1409 }
1410 ss.binlog.Log(&binarylog.ServerMessage{
1411 Message: data,
1412 })
1413 }
1414 if ss.statsHandler != nil {
1415 ss.statsHandler.HandleRPC(ss.s.Context(), outPayload(false, m, data, payload, time.Now()))
1416 }
1417 return nil
1418}
1419
1420func (ss *serverStream) RecvMsg(m interface{}) (err error) {
1421 defer func() {
1422 if ss.trInfo != nil {
1423 ss.mu.Lock()
1424 if ss.trInfo.tr != nil {
1425 if err == nil {
1426 ss.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
1427 } else if err != io.EOF {
1428 ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
1429 ss.trInfo.tr.SetError()
1430 }
1431 }
1432 ss.mu.Unlock()
1433 }
1434 if err != nil && err != io.EOF {
1435 st, _ := status.FromError(toRPCErr(err))
1436 ss.t.WriteStatus(ss.s, st)
1437 // Non-user specified status was sent out. This should be an error
1438 // case (as a server side Cancel maybe).
1439 //
1440 // This is not handled specifically now. User will return a final
1441 // status from the service handler, we will log that error instead.
1442 // This behavior is similar to an interceptor.
1443 }
1444 if channelz.IsOn() && err == nil {
1445 ss.t.IncrMsgRecv()
1446 }
1447 }()
1448 var payInfo *payloadInfo
1449 if ss.statsHandler != nil || ss.binlog != nil {
1450 payInfo = &payloadInfo{}
1451 }
1452 if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxReceiveMessageSize, payInfo, ss.decomp); err != nil {
1453 if err == io.EOF {
1454 if ss.binlog != nil {
1455 ss.binlog.Log(&binarylog.ClientHalfClose{})
1456 }
1457 return err
1458 }
1459 if err == io.ErrUnexpectedEOF {
1460 err = status.Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
1461 }
1462 return toRPCErr(err)
1463 }
1464 if ss.statsHandler != nil {
1465 ss.statsHandler.HandleRPC(ss.s.Context(), &stats.InPayload{
1466 RecvTime: time.Now(),
1467 Payload: m,
1468 // TODO truncate large payload.
1469 Data: payInfo.uncompressedBytes,
1470 Length: len(payInfo.uncompressedBytes),
1471 })
1472 }
1473 if ss.binlog != nil {
1474 ss.binlog.Log(&binarylog.ClientMessage{
1475 Message: payInfo.uncompressedBytes,
1476 })
1477 }
1478 return nil
1479}
1480
1481// MethodFromServerStream returns the method string for the input stream.
1482// The returned string is in the format of "/service/method".
1483func MethodFromServerStream(stream ServerStream) (string, bool) {
1484 return Method(stream.Context())
1485}