vendor/google.golang.org/grpc/call.go - gddo - Git at Google

 /*
  *
  * Copyright 2014 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  */

 package grpc

 import (
 	"bytes"
 	"io"
 	"time"

 	"golang.org/x/net/context"
 	"golang.org/x/net/trace"
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/peer"
 	"google.golang.org/grpc/stats"
 	"google.golang.org/grpc/status"
 	"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.
 // TODO ctx is used for stats collection and processing. It is the context passed from the application.
 func recvResponse(ctx context.Context, 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}
 	var inPayload *stats.InPayload
 	if dopts.copts.StatsHandler != nil {
 		inPayload = &stats.InPayload{
 			Client: true,
 		}
 	}
 	for {
 		if c.maxReceiveMessageSize == nil {
 			return Errorf(codes.Internal, "callInfo maxReceiveMessageSize field uninitialized(nil)")
 		}
 		if err = recv(p, dopts.codec, stream, dopts.dc, reply, *c.maxReceiveMessageSize, inPayload); err != nil {
 			if err == io.EOF {
 				break
 			}
 			return
 		}
 	}
 	if inPayload != nil && err == io.EOF && stream.Status().Code() == codes.OK {
 		// TODO in the current implementation, inTrailer may be handled before inPayload in some cases.
 		// Fix the order if necessary.
 		dopts.copts.StatsHandler.HandleRPC(ctx, inPayload)
 	}
 	c.trailerMD = stream.Trailer()
 	return nil
 }

 // sendRequest writes out various information of an RPC such as Context and Message.
 func sendRequest(ctx context.Context, dopts dialOptions, compressor Compressor, c *callInfo, callHdr *transport.CallHdr, stream *transport.Stream, t transport.ClientTransport, args interface{}, opts *transport.Options) (err error) {
 	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
 		outPayload *stats.OutPayload
 	)
 	if compressor != nil {
 		cbuf = new(bytes.Buffer)
 	}
 	if dopts.copts.StatsHandler != nil {
 		outPayload = &stats.OutPayload{
 			Client: true,
 		}
 	}
 	hdr, data, err := encode(dopts.codec, args, compressor, cbuf, outPayload)
 	if err != nil {
 		return err
 	}
 	if c.maxSendMessageSize == nil {
 		return Errorf(codes.Internal, "callInfo maxSendMessageSize field uninitialized(nil)")
 	}
 	if len(data) > *c.maxSendMessageSize {
 		return Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(data), *c.maxSendMessageSize)
 	}
 	err = t.Write(stream, hdr, data, opts)
 	if err == nil && outPayload != nil {
 		outPayload.SentTime = time.Now()
 		dopts.copts.StatsHandler.HandleRPC(ctx, outPayload)
 	}
 	// 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 err
 	}
 	// Sent successfully.
 	return 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) (e error) {
 	c := defaultCallInfo()
 	mc := cc.GetMethodConfig(method)
 	if mc.WaitForReady != nil {
 		c.failFast = !*mc.WaitForReady
 	}

 	if mc.Timeout != nil && *mc.Timeout >= 0 {
 		var cancel context.CancelFunc
 		ctx, cancel = context.WithTimeout(ctx, *mc.Timeout)
 		defer cancel()
 	}

 	opts = append(cc.dopts.callOptions, opts...)
 	for _, o := range opts {
 		if err := o.before(c); err != nil {
 			return toRPCErr(err)
 		}
 	}
 	defer func() {
 		for _, o := range opts {
 			o.after(c)
 		}
 	}()

 	c.maxSendMessageSize = getMaxSize(mc.MaxReqSize, c.maxSendMessageSize, defaultClientMaxSendMessageSize)
 	c.maxReceiveMessageSize = getMaxSize(mc.MaxRespSize, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)

 	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 e != nil {
 				c.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{e}}, true)
 				c.traceInfo.tr.SetError()
 			}
 		}()
 	}
 	ctx = newContextWithRPCInfo(ctx, c.failFast)
 	sh := cc.dopts.copts.StatsHandler
 	if sh != nil {
 		ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method, FailFast: c.failFast})
 		begin := &stats.Begin{
 			Client:    true,
 			BeginTime: time.Now(),
 			FailFast:  c.failFast,
 		}
 		sh.HandleRPC(ctx, begin)
 		defer func() {
 			end := &stats.End{
 				Client:  true,
 				EndTime: time.Now(),
 				Error:   e,
 			}
 			sh.HandleRPC(ctx, end)
 		}()
 	}
 	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(balancer.DoneInfo)
 		)
 		// 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()
 		}
 		if c.creds != nil {
 			callHdr.Creds = c.creds
 		}

 		gopts := BalancerGetOptions{
 			BlockingWait: !c.failFast,
 		}
 		t, put, err = cc.getTransport(ctx, gopts)
 		if err != nil {
 			// TODO(zhaoq): Probably revisit the error handling.
 			if _, ok := status.FromError(err); 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 = t.NewStream(ctx, callHdr)
 		if err != nil {
 			if put != nil {
 				if _, ok := err.(transport.ConnectionError); ok {
 					// If error is connection error, transport was sending data on wire,
 					// and we are not sure if anything has been sent on wire.
 					// If error is not connection error, we are sure nothing has been sent.
 					updateRPCInfoInContext(ctx, rpcInfo{bytesSent: true, bytesReceived: false})
 				}
 				put(balancer.DoneInfo{Err: err})
 			}
 			if _, ok := err.(transport.ConnectionError); (ok || err == transport.ErrStreamDrain) && !c.failFast {
 				continue
 			}
 			return toRPCErr(err)
 		}
 		if peer, ok := peer.FromContext(stream.Context()); ok {
 			c.peer = peer
 		}
 		err = sendRequest(ctx, cc.dopts, cc.dopts.cp, c, callHdr, stream, t, args, topts)
 		if err != nil {
 			if put != nil {
 				updateRPCInfoInContext(ctx, rpcInfo{
 					bytesSent:     stream.BytesSent(),
 					bytesReceived: stream.BytesReceived(),
 				})
 				put(balancer.DoneInfo{Err: err})
 			}
 			// 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) && !c.failFast {
 				continue
 			}
 			return toRPCErr(err)
 		}
 		err = recvResponse(ctx, cc.dopts, t, c, stream, reply)
 		if err != nil {
 			if put != nil {
 				updateRPCInfoInContext(ctx, rpcInfo{
 					bytesSent:     stream.BytesSent(),
 					bytesReceived: stream.BytesReceived(),
 				})
 				put(balancer.DoneInfo{Err: err})
 			}
 			if _, ok := err.(transport.ConnectionError); (ok || err == transport.ErrStreamDrain) && !c.failFast {
 				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 {
 			updateRPCInfoInContext(ctx, rpcInfo{
 				bytesSent:     stream.BytesSent(),
 				bytesReceived: stream.BytesReceived(),
 			})
 			put(balancer.DoneInfo{Err: err})
 		}
 		return stream.Status().Err()
 	}
 }
	/*
	*
	* Copyright 2014 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/

	package grpc

	import (
	"bytes"
	"io"
	"time"

	"golang.org/x/net/context"
	"golang.org/x/net/trace"
	"google.golang.org/grpc/balancer"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/peer"
	"google.golang.org/grpc/stats"
	"google.golang.org/grpc/status"
	"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.
	// TODO ctx is used for stats collection and processing. It is the context passed from the application.
	func recvResponse(ctx context.Context, 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}
	var inPayload *stats.InPayload
	if dopts.copts.StatsHandler != nil {
	inPayload = &stats.InPayload{
	Client: true,
	}
	}
	for {
	if c.maxReceiveMessageSize == nil {
	return Errorf(codes.Internal, "callInfo maxReceiveMessageSize field uninitialized(nil)")
	}
	if err = recv(p, dopts.codec, stream, dopts.dc, reply, *c.maxReceiveMessageSize, inPayload); err != nil {
	if err == io.EOF {
	break
	}
	return
	}
	}
	if inPayload != nil && err == io.EOF && stream.Status().Code() == codes.OK {
	// TODO in the current implementation, inTrailer may be handled before inPayload in some cases.
	// Fix the order if necessary.
	dopts.copts.StatsHandler.HandleRPC(ctx, inPayload)
	}
	c.trailerMD = stream.Trailer()
	return nil
	}

	// sendRequest writes out various information of an RPC such as Context and Message.
	func sendRequest(ctx context.Context, dopts dialOptions, compressor Compressor, c callInfo, callHdr transport.CallHdr, stream transport.Stream, t transport.ClientTransport, args interface{}, opts transport.Options) (err error) {
	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
	outPayload *stats.OutPayload
	)
	if compressor != nil {
	cbuf = new(bytes.Buffer)
	}
	if dopts.copts.StatsHandler != nil {
	outPayload = &stats.OutPayload{
	Client: true,
	}
	}
	hdr, data, err := encode(dopts.codec, args, compressor, cbuf, outPayload)
	if err != nil {
	return err
	}
	if c.maxSendMessageSize == nil {
	return Errorf(codes.Internal, "callInfo maxSendMessageSize field uninitialized(nil)")
	}
	if len(data) > *c.maxSendMessageSize {
	return Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(data), *c.maxSendMessageSize)
	}
	err = t.Write(stream, hdr, data, opts)
	if err == nil && outPayload != nil {
	outPayload.SentTime = time.Now()
	dopts.copts.StatsHandler.HandleRPC(ctx, outPayload)
	}
	// 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 err
	}
	// Sent successfully.
	return 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) (e error) {
	c := defaultCallInfo()
	mc := cc.GetMethodConfig(method)
	if mc.WaitForReady != nil {
	c.failFast = !*mc.WaitForReady
	}

	if mc.Timeout != nil && *mc.Timeout >= 0 {
	var cancel context.CancelFunc
	ctx, cancel = context.WithTimeout(ctx, *mc.Timeout)
	defer cancel()
	}

	opts = append(cc.dopts.callOptions, opts...)
	for _, o := range opts {
	if err := o.before(c); err != nil {
	return toRPCErr(err)
	}
	}
	defer func() {
	for _, o := range opts {
	o.after(c)
	}
	}()

	c.maxSendMessageSize = getMaxSize(mc.MaxReqSize, c.maxSendMessageSize, defaultClientMaxSendMessageSize)
	c.maxReceiveMessageSize = getMaxSize(mc.MaxRespSize, c.maxReceiveMessageSize, defaultClientMaxReceiveMessageSize)

	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 e != nil {
	c.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{e}}, true)
	c.traceInfo.tr.SetError()
	}
	}()
	}
	ctx = newContextWithRPCInfo(ctx, c.failFast)
	sh := cc.dopts.copts.StatsHandler
	if sh != nil {
	ctx = sh.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method, FailFast: c.failFast})
	begin := &stats.Begin{
	Client: true,
	BeginTime: time.Now(),
	FailFast: c.failFast,
	}
	sh.HandleRPC(ctx, begin)
	defer func() {
	end := &stats.End{
	Client: true,
	EndTime: time.Now(),
	Error: e,
	}
	sh.HandleRPC(ctx, end)
	}()
	}
	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(balancer.DoneInfo)
	)
	// 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()
	}
	if c.creds != nil {
	callHdr.Creds = c.creds
	}

	gopts := BalancerGetOptions{
	BlockingWait: !c.failFast,
	}
	t, put, err = cc.getTransport(ctx, gopts)
	if err != nil {
	// TODO(zhaoq): Probably revisit the error handling.
	if _, ok := status.FromError(err); 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 = t.NewStream(ctx, callHdr)
	if err != nil {
	if put != nil {
	if _, ok := err.(transport.ConnectionError); ok {
	// If error is connection error, transport was sending data on wire,
	// and we are not sure if anything has been sent on wire.
	// If error is not connection error, we are sure nothing has been sent.
	updateRPCInfoInContext(ctx, rpcInfo{bytesSent: true, bytesReceived: false})
	}
	put(balancer.DoneInfo{Err: err})
	}
	if _, ok := err.(transport.ConnectionError); (ok \|\| err == transport.ErrStreamDrain) && !c.failFast {
	continue
	}
	return toRPCErr(err)
	}
	if peer, ok := peer.FromContext(stream.Context()); ok {
	c.peer = peer
	}
	err = sendRequest(ctx, cc.dopts, cc.dopts.cp, c, callHdr, stream, t, args, topts)
	if err != nil {
	if put != nil {
	updateRPCInfoInContext(ctx, rpcInfo{
	bytesSent: stream.BytesSent(),
	bytesReceived: stream.BytesReceived(),
	})
	put(balancer.DoneInfo{Err: err})
	}
	// 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) && !c.failFast {
	continue
	}
	return toRPCErr(err)
	}
	err = recvResponse(ctx, cc.dopts, t, c, stream, reply)
	if err != nil {
	if put != nil {
	updateRPCInfoInContext(ctx, rpcInfo{
	bytesSent: stream.BytesSent(),
	bytesReceived: stream.BytesReceived(),
	})
	put(balancer.DoneInfo{Err: err})
	}
	if _, ok := err.(transport.ConnectionError); (ok \|\| err == transport.ErrStreamDrain) && !c.failFast {
	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 {
	updateRPCInfoInContext(ctx, rpcInfo{
	bytesSent: stream.BytesSent(),
	bytesReceived: stream.BytesReceived(),
	})
	put(balancer.DoneInfo{Err: err})
	}
	return stream.Status().Err()
	}
	}