Ejemplo n.º 1
0
// 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{}) error {
	// Try to acquire header metadata from the server if there is any.
	var err error
	defer func() {
		if err != nil {
			if _, ok := err.(transport.ConnectionError); !ok {
				t.CloseStream(stream, err)
			}
		}
	}()
	c.headerMD, err = stream.Header()
	if err != nil {
		return err
	}
	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 err
		}
	}
	c.trailerMD = stream.Trailer()
	return nil
}
Ejemplo n.º 2
0
func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream) {
	sm := stream.Method()
	if sm != "" && sm[0] == '/' {
		sm = sm[1:]
	}
	pos := strings.LastIndex(sm, "/")
	if pos == -1 {
		if err := t.WriteStatus(stream, codes.InvalidArgument, fmt.Sprintf("malformed method name: %q", stream.Method())); err != nil {
			log.Printf("grpc: Server.handleStream failed to write status: %v", err)
		}
		return
	}
	service := sm[:pos]
	method := sm[pos+1:]
	srv, ok := s.m[service]
	if !ok {
		if err := t.WriteStatus(stream, codes.Unimplemented, fmt.Sprintf("unknown service %v", service)); err != nil {
			log.Printf("grpc: Server.handleStream failed to write status: %v", err)
		}
		return
	}
	// Unary RPC or Streaming RPC?
	if md, ok := srv.md[method]; ok {
		s.processUnaryRPC(t, stream, srv, md)
		return
	}
	if sd, ok := srv.sd[method]; ok {
		s.processStreamingRPC(t, stream, srv, sd)
		return
	}
	if err := t.WriteStatus(stream, codes.Unimplemented, fmt.Sprintf("unknown method %v", method)); err != nil {
		log.Printf("grpc: Server.handleStream failed to write status: %v", err)
	}
}
Ejemplo n.º 3
0
func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}) error {
	// 1. 获取1帧请求数据
	pf, d, err := p.recvMsg()
	if err != nil {
		return err
	}

	// 2. 压缩算法在 Stream中都已经通信过?
	if err := checkRecvPayload(pf, s.RecvCompress(), dc); err != nil {
		return err
	}

	// 3. 解压缩数据
	if pf == compressionMade {
		d, err = dc.Do(bytes.NewReader(d))
		if err != nil {
			return transport.StreamErrorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
		}
	}

	// 4. 反序列化(可以使用protobuf, 也可以使用thrift等等)
	if err := c.Unmarshal(d, m); err != nil {
		return transport.StreamErrorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
	}
	return nil
}
Ejemplo n.º 4
0
func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc) (err error) {
	ss := &serverStream{
		t:       t,
		s:       stream,
		p:       &parser{s: stream},
		codec:   s.opts.codec,
		tracing: EnableTracing,
	}
	if ss.tracing {
		ss.traceInfo.tr = trace.New("grpc.Recv."+methodFamily(stream.Method()), stream.Method())
		ss.traceInfo.firstLine.client = false
		ss.traceInfo.tr.LazyLog(&ss.traceInfo.firstLine, false)
		defer func() {
			ss.mu.Lock()
			if err != nil && err != io.EOF {
				ss.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
				ss.traceInfo.tr.SetError()
			}
			ss.traceInfo.tr.Finish()
			ss.traceInfo.tr = nil
			ss.mu.Unlock()
		}()
	}
	if appErr := sd.Handler(srv.server, ss); appErr != nil {
		if err, ok := appErr.(rpcError); ok {
			ss.statusCode = err.code
			ss.statusDesc = err.desc
		} else {
			ss.statusCode = convertCode(appErr)
			ss.statusDesc = appErr.Error()
		}
	}
	return t.WriteStatus(ss.s, ss.statusCode, ss.statusDesc)

}
Ejemplo n.º 5
0
func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options) error {
	var (
		cbuf       *bytes.Buffer
		outPayload *stats.OutPayload
	)
	if cp != nil {
		cbuf = new(bytes.Buffer)
	}
	if stats.On() {
		outPayload = &stats.OutPayload{}
	}
	p, err := encode(s.opts.codec, msg, cp, cbuf, outPayload)
	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)
	}
	err = t.Write(stream, p, opts)
	if err == nil && outPayload != nil {
		outPayload.SentTime = time.Now()
		stats.HandleRPC(stream.Context(), outPayload)
	}
	return err
}
Ejemplo n.º 6
0
func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}, maxMsgSize int, inPayload *stats.InPayload) error {
	pf, d, err := p.recvMsg(maxMsgSize)
	if err != nil {
		return err
	}
	if inPayload != nil {
		inPayload.WireLength = len(d)
	}
	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)
	}
	if inPayload != nil {
		inPayload.RecvTime = time.Now()
		inPayload.Payload = m
		// TODO truncate large payload.
		inPayload.Data = d
		inPayload.Length = len(d)
	}
	return nil
}
Ejemplo n.º 7
0
func recv(p *parser, s *transport.Stream, dg DecompressorGenerator, m interface{}) error {
	codecType, compressType, d, err := p.recvMsg()
	if err != nil {
		return err
	}

	//decompress
	var dc Decompressor
	if compressType == COMPRESS_TYPE_GZIP && dg != nil {
		dc = dg()
	}
	if err := checkRecvPayload(codecType, compressType, s.RecvCompress(), dc); err != nil {
		return err
	}
	if compressType == COMPRESS_TYPE_GZIP {
		d, err = dc.Do(bytes.NewReader(d))
		if err != nil {
			return transport.StreamErrorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
		}
	}

	//unmarshal
	c, err := GetCodec(codecType)
	if err != nil {
		return err
	}
	if err := c.Unmarshal(d, m); err != nil {
		return transport.StreamErrorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
	}
	return nil
}
Ejemplo n.º 8
0
// 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{}) error {
	// Try to acquire header metadata from the server if there is any.

	// 如何接受请求呢?
	// 1. 和处理的Http请求类似, 首先是: 处理Header
	var err error
	c.headerMD, err = stream.Header()
	if err != nil {
		return err
	}

	// 2. 然后处理stream
	p := &parser{r: stream}
	for {
		// stream --> (parser) --> msg --> decompress --> unmarshal --> reply
		// Iter 1: 读取到Reply
		// Iter 2: 读取失败,碰到EOF
		if err = recv(p, dopts.codec, stream, dopts.dc, reply); err != nil {
			// 似乎需要等待stream的EOF
			if err == io.EOF {
				break
			}
			return err
		}
	}

	// 3. 获取Trailer?
	c.trailerMD = stream.Trailer()
	return nil
}
Ejemplo n.º 9
0
func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
	var cp Compressor
	if s.opts.cg != nil {
		cp = s.opts.cg()
		stream.SetSendCompress(cp.Type())
	}
	ss := &serverStream{
		t:      t,
		s:      stream,
		p:      &parser{s: stream},
		codec:  s.opts.codec,
		cp:     cp,
		dg:     s.opts.dg,
		trInfo: trInfo,
	}
	if 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()
		}()
	}
	if appErr := sd.Handler(srv.server, ss); 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)

}
Ejemplo n.º 10
0
func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc) {
	p := &parser{s: stream}
	for {
		pf, req, err := p.recvMsg()
		if err == io.EOF {
			// The entire stream is done (for unary RPC only).
			return
		}
		if err != nil {
			switch err := err.(type) {
			case transport.ConnectionError:
				// Nothing to do here.
			case transport.StreamError:
				if err := t.WriteStatus(stream, err.Code, err.Desc); err != nil {
					log.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
				}
			default:
				panic(fmt.Sprintf("grpc: Unexpected error (%T) from recvMsg: %v", err, err))
			}
			return
		}
		switch pf {
		case compressionNone:
			reply, appErr := md.Handler(srv.server, stream.Context(), req)
			if appErr != nil {
				if err := t.WriteStatus(stream, convertCode(appErr), appErr.Error()); err != nil {
					log.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
				}
				return
			}
			opts := &transport.Options{
				Last:  true,
				Delay: false,
			}
			statusCode := codes.OK
			statusDesc := ""
			if err := s.sendProto(t, stream, reply, compressionNone, opts); err != nil {
				if _, ok := err.(transport.ConnectionError); ok {
					return
				}
				if e, ok := err.(transport.StreamError); ok {
					statusCode = e.Code
					statusDesc = e.Desc
				} else {
					statusCode = codes.Unknown
					statusDesc = err.Error()
				}
			}
			if err := t.WriteStatus(stream, statusCode, statusDesc); err != nil {
				log.Printf("grpc: Server.processUnaryRPC failed to write status: %v", err)
			}
		default:
			panic(fmt.Sprintf("payload format to be supported: %d", pf))
		}
	}
}
Ejemplo n.º 11
0
func (g *grpcServer) processStream(t transport.ServerTransport, stream *transport.Stream, service *service, mtype *methodType, codec grpc.Codec, ct string, ctx context.Context) (err error) {
	opts := g.opts

	r := &rpcRequest{
		service:     opts.Name,
		contentType: ct,
		method:      stream.Method(),
		stream:      true,
	}

	ss := &rpcStream{
		request:    r,
		t:          t,
		s:          stream,
		p:          &parser{r: stream},
		codec:      codec,
		maxMsgSize: defaultMaxMsgSize,
	}

	function := mtype.method.Func
	var returnValues []reflect.Value

	// Invoke the method, providing a new value for the reply.
	fn := func(ctx context.Context, req server.Request, stream interface{}) error {
		returnValues = function.Call([]reflect.Value{service.rcvr, mtype.prepareContext(ctx), reflect.ValueOf(stream)})
		if err := returnValues[0].Interface(); err != nil {
			return err.(error)
		}

		return nil
	}

	for i := len(opts.HdlrWrappers); i > 0; i-- {
		fn = opts.HdlrWrappers[i-1](fn)
	}

	appErr := fn(ctx, r, ss)
	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()
		}
	}

	return t.WriteStatus(ss.s, ss.statusCode, ss.statusDesc)
}
Ejemplo n.º 12
0
func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc) (err error) {
	ss := &serverStream{
		t:       t,
		s:       stream,
		p:       &parser{s: stream},
		codec:   s.opts.codec,
		tracing: EnableTracing,
	}
	if ss.tracing {
		ss.traceInfo.tr = stream.Trace()
		ss.traceInfo.firstLine.client = false
		ss.traceInfo.firstLine.remoteAddr = t.RemoteAddr()
		if dl, ok := stream.Context().Deadline(); ok {
			ss.traceInfo.firstLine.deadline = dl.Sub(time.Now())
		}
		ss.traceInfo.tr.LazyLog(&ss.traceInfo.firstLine, false)
		defer func() {
			ss.mu.Lock()
			if err != nil && err != io.EOF {
				ss.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
				ss.traceInfo.tr.SetError()
			}
			ss.traceInfo.tr.Finish()
			ss.traceInfo.tr = nil
			ss.mu.Unlock()
		}()
	}
	if appErr := sd.Handler(srv.server, ss); appErr != nil {
		if err, ok := appErr.(rpcError); ok {
			ss.statusCode = err.code
			ss.statusDesc = err.desc
		} else {
			ss.statusCode = convertCode(appErr)
			ss.statusDesc = appErr.Error()
		}
	}
	if ss.tracing {
		ss.mu.Lock()
		if ss.statusCode != codes.OK {
			ss.traceInfo.tr.LazyLog(stringer(ss.statusDesc), true)
			ss.traceInfo.tr.SetError()
		} else {
			ss.traceInfo.tr.LazyLog(stringer("OK"), false)
		}
		ss.mu.Unlock()
	}
	return t.WriteStatus(ss.s, ss.statusCode, ss.statusDesc)

}
Ejemplo n.º 13
0
func (s *Proxy) handleStream(frontTrans transport.ServerTransport, frontStream *transport.Stream) {
	sm := frontStream.Method()
	if sm != "" && sm[0] == '/' {
		sm = sm[1:]
	}
	pos := strings.LastIndex(sm, "/")
	if pos == -1 {
		if err := frontTrans.WriteStatus(frontStream, codes.InvalidArgument, fmt.Sprintf("malformed method name: %q", frontStream.Method())); err != nil {
			s.logger.Printf("proxy: Proxy.handleStream failed to write status: %v", err)
		}
		return
	}
	ProxyStream(s.director, s.logger, frontTrans, frontStream)

}
Ejemplo n.º 14
0
// 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) {
	tr, ok := trace.FromContext(stream.Context())
	if !ok {
		return nil
	}

	trInfo = &traceInfo{
		tr: tr,
	}
	trInfo.firstLine.client = false
	trInfo.firstLine.remoteAddr = st.RemoteAddr()

	if dl, ok := stream.Context().Deadline(); ok {
		trInfo.firstLine.deadline = dl.Sub(time.Now())
	}
	return trInfo
}
Ejemplo n.º 15
0
func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}) error {
	pf, d, err := p.recvMsg()
	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 transport.StreamErrorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
		}
	}
	if err := c.Unmarshal(d, m); err != nil {
		return transport.StreamErrorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
	}
	return nil
}
Ejemplo n.º 16
0
// 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{}) error {
	// Try to acquire header metadata from the server if there is any.
	var err error
	c.headerMD, err = stream.Header()
	if err != nil {
		return err
	}
	p := &parser{r: stream}
	for {
		if err = recv(p, dopts.codec, stream, dopts.dc, reply); err != nil {
			if err == io.EOF {
				break
			}
			return err
		}
	}
	c.trailerMD = stream.Trailer()
	return nil
}
Ejemplo n.º 17
0
// recv 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 recv(t transport.ClientTransport, c *callInfo, stream *transport.Stream, reply proto.Message) error {
	// Try to acquire header metadata from the server if there is any.
	var err error
	c.headerMD, err = stream.Header()
	if err != nil {
		return err
	}
	p := &parser{s: stream}
	for {
		if err = recvProto(p, reply); err != nil {
			if err == io.EOF {
				break
			}
			return err
		}
	}
	c.trailerMD = stream.Trailer()
	return nil
}
Ejemplo n.º 18
0
// ProxyStream performs a forward of a gRPC frontend stream to a backend.
func ProxyStream(director StreamDirector, logger grpclog.Logger, frontTrans transport.ServerTransport, frontStream *transport.Stream) {
	backendTrans, backendStream, err := backendTransportStream(director, frontStream.Context())
	if err != nil {
		frontTrans.WriteStatus(frontStream, grpc.Code(err), grpc.ErrorDesc(err))
		logger.Printf("proxy: Proxy.handleStream %v failed to allocate backend: %v", frontStream.Method(), err)
		return
	}
	defer backendTrans.CloseStream(backendStream, nil)

	// data coming from client call to backend
	ingressPathChan := forwardDataFrames(frontStream, backendStream, backendTrans)

	// custom header handling *must* be after some data is processed by the backend, otherwise there's a deadlock
	headerMd, err := backendStream.Header()
	if err == nil && len(headerMd) > 0 {
		frontTrans.WriteHeader(frontStream, headerMd)
	}
	// data coming from backend back to client call
	egressPathChan := forwardDataFrames(backendStream, frontStream, frontTrans)

	// wait for both data streams to complete.
	egressErr := <-egressPathChan
	ingressErr := <-ingressPathChan
	if egressErr != io.EOF || ingressErr != io.EOF {
		logger.Printf("proxy: Proxy.handleStream %v failure during transfer ingres: %v egress: %v", frontStream.Method(), ingressErr, egressErr)
		frontTrans.WriteStatus(frontStream, codes.Unavailable, fmt.Sprintf("problem in transfer ingress: %v egress: %v", ingressErr, egressErr))
		return
	}
	// handle trailing metadata
	trailingMd := backendStream.Trailer()
	if len(trailingMd) > 0 {
		frontStream.SetTrailer(trailingMd)
	}
	frontTrans.WriteStatus(frontStream, backendStream.StatusCode(), backendStream.StatusDesc())
}
Ejemplo n.º 19
0
Archivo: server.go Proyecto: qband/down
// 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
}
Ejemplo n.º 20
0
// forwardDataFrames moves data from one gRPC transport `Stream` to another in async fashion.
// It returns an error channel. `nil` on it signifies everything was fine, anything else is a serious problem.
func forwardDataFrames(srcStream *transport.Stream, dstStream *transport.Stream, dstTransport transportWriter) chan error {
	ret := make(chan error, 1)

	go func() {
		data := make([]byte, 4096)
		opt := &transport.Options{}
		for {
			n, err := srcStream.Read(data)
			if err != nil { // including io.EOF
				// Send nil to terminate the stream.
				opt.Last = true
				dstTransport.Write(dstStream, nil, opt)
				ret <- err
				break
			}
			if err := dstTransport.Write(dstStream, data[:n], opt); err != nil {
				ret <- err
				break
			}
		}
		close(ret)
	}()
	return ret
}
Ejemplo n.º 21
0
// 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 stats.On() {
		inPayload = &stats.InPayload{
			Client: true,
		}
	}
	for {
		if err = recv(p, dopts.codec, stream, dopts.dc, reply, math.MaxInt32, inPayload); err != nil {
			if err == io.EOF {
				break
			}
			return
		}
	}
	if inPayload != nil && err == io.EOF && stream.StatusCode() == codes.OK {
		// TODO in the current implementation, inTrailer may be handled before inPayload in some cases.
		// Fix the order if necessary.
		stats.Handle(ctx, inPayload)
	}
	c.trailerMD = stream.Trailer()
	return nil
}
Ejemplo n.º 22
0
// 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) (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 {
				if c.failFast {
					return Errorf(codes.Unavailable, "%v", errConnClosing)
				}
				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
			}
			if _, ok := err.(transport.ConnectionError); ok {
				if c.failFast {
					return toRPCErr(err)
				}
				continue
			}
			return toRPCErr(err)
		}
		// Receive the response
		err = recvResponse(cc.dopts, t, &c, stream, reply)
		if err != nil {
			if put != nil {
				put()
				put = nil
			}
			if _, ok := err.(transport.ConnectionError); ok {
				if c.failFast {
					return toRPCErr(err)
				}
				continue
			}
			t.CloseStream(stream, err)
			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())
	}
}
Ejemplo n.º 23
0
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)

}
Ejemplo n.º 24
0
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)
	}
}
Ejemplo n.º 25
0
// Invoke is called by the generated code. It sends the RPC request on the
// wire and returns after response is received.
func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) (err error) {
	var c callInfo
	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,
	}
	var (
		lastErr error // record the error that happened
	)
	for {
		var (
			err    error
			t      transport.ClientTransport
			stream *transport.Stream
		)
		// TODO(zhaoq): Need a formal spec of retry strategy for non-failfast rpcs.
		if lastErr != nil && c.failFast {
			return toRPCErr(lastErr)
		}
		callHdr := &transport.CallHdr{
			Host:   cc.authority,
			Method: method,
		}
		t, err = cc.dopts.picker.Pick(ctx)
		if err != nil {
			if lastErr != nil {
				// This was a retry; return the error from the last attempt.
				return toRPCErr(lastErr)
			}
			return toRPCErr(err)
		}
		if c.traceInfo.tr != nil {
			c.traceInfo.tr.LazyLog(&payload{sent: true, msg: args}, true)
		}
		stream, err = sendRequest(ctx, cc.dopts.codec, callHdr, t, args, topts)
		if err != nil {
			if _, ok := err.(transport.ConnectionError); ok {
				lastErr = err
				continue
			}
			if lastErr != nil {
				return toRPCErr(lastErr)
			}
			return toRPCErr(err)
		}
		// Receive the response
		lastErr = recvResponse(cc.dopts.codec, t, &c, stream, reply)
		if _, ok := lastErr.(transport.ConnectionError); ok {
			continue
		}
		if c.traceInfo.tr != nil {
			c.traceInfo.tr.LazyLog(&payload{sent: false, msg: reply}, true)
		}
		t.CloseStream(stream, lastErr)
		if lastErr != nil {
			return toRPCErr(lastErr)
		}
		return Errorf(stream.StatusCode(), stream.StatusDesc())
	}
}
Ejemplo n.º 26
0
//
// service存在, MethodDesc也存在
//
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()
			}
		}()
	}
	p := &parser{r: stream}
	for {
		// PayloadFormat, Request Data, Err
		pf, req, err := p.recvMsg()
		if err == io.EOF {
			// The entire stream is done (for unary RPC only).
			return err
		}
		if err == io.ErrUnexpectedEOF {
			err = transport.StreamError{Code: codes.Internal, Desc: "io.ErrUnexpectedEOF"}
		}
		if err != nil {
			switch err := err.(type) {
			case transport.ConnectionError:
			// Nothing to do here.
			// 连接断开了,则直接返回
			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 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:
				if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
					grpclog.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
				}

			}
			return err
		}

		// 处理正常的Method Invocation
		statusCode := codes.OK
		statusDesc := ""

		// Decode Input
		df := func(v interface{}) error {
			if pf == compressionMade {
				// 如果数据有压缩,则通过opts中配置的Compressor/Decompressor进行处理
				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
				}
			}

			// 将req中的数据反序列化到: v 中,例如:
			//	in := new(HelloRequest)
			//	if err := dec(in); err != nil {
			//		return nil, err
			//	}
			if err := s.opts.codec.Unmarshal(req, v); err != nil {
				return err
			}

			// 打印trace info
			if trInfo != nil {
				trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
			}
			return nil
		}

		// 参考: func _Greeter_SayHello_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error) (interface{}, error) {
		//var _Greeter_serviceDesc = grpc.ServiceDesc{
		//	ServiceName: "helloworld.Greeter",
		//	HandlerType: (*GreeterServer)(nil),
		//	Methods: []grpc.MethodDesc{
		//		{
		//			// 方法的描述
		//			MethodName: "SayHello",
		//			Handler:    _Greeter_SayHello_Handler,
		//		},
		//	},
		//
		//	// Streams如何处理呢?
		//	Streams: []grpc.StreamDesc{},
		//}
		// Handler是直接可调用的函数
		// 其中: df 接受输入参数的类型,进行数据的反序列化
		//
		reply, appErr := md.Handler(srv.server, stream.Context(), df)

		// 如果处理应用返回来的Error
		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
		}

		// 处理完毕之后,正常返回数据
		if trInfo != nil {
			trInfo.tr.LazyLog(stringer("OK"), false)
		}
		opts := &transport.Options{
			Last:  true,
			Delay: false,
		}
		if s.opts.cp != nil {
			stream.SetSendCompress(s.opts.cp.Type())
		}

		// 返回数据
		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)
	}
}
Ejemplo n.º 27
0
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()
			}
		}()
	}
	if stats.On() {
		ctx = stats.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method})
		begin := &stats.Begin{
			Client:    true,
			BeginTime: time.Now(),
			FailFast:  c.failFast,
		}
		stats.HandleRPC(ctx, begin)
	}
	defer func() {
		if err != nil && stats.On() {
			// Only handle end stats if err != nil.
			end := &stats.End{
				Client: true,
				Error:  err,
			}
			stats.HandleRPC(ctx, end)
		}
	}()
	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,

		statsCtx: ctx,
	}
	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
}
Ejemplo n.º 28
0
Archivo: server.go Proyecto: qband/down
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()
			}
		}()
	}
	p := &parser{r: stream}
	for {
		pf, req, err := p.recvMsg()
		if err == io.EOF {
			// The entire stream is done (for unary RPC only).
			return err
		}
		if err == io.ErrUnexpectedEOF {
			err = transport.StreamError{Code: codes.Internal, Desc: "io.ErrUnexpectedEOF"}
		}
		if err != nil {
			switch err := err.(type) {
			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 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:
				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 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 s.opts.cp != nil {
			stream.SetSendCompress(s.opts.cp.Type())
		}
		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)
	}
}
Ejemplo n.º 29
0
Archivo: server.go Proyecto: qband/down
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()
	}
}
Ejemplo n.º 30
0
// Invoke is called by the generated code. It sends the RPC request on the
// wire and returns after response is received.
func Invoke(ctx context.Context, method string, args, reply proto.Message, cc *ClientConn, opts ...CallOption) error {
	var c callInfo
	for _, o := range opts {
		if err := o.before(&c); err != nil {
			return toRPCErr(err)
		}
	}
	defer func() {
		for _, o := range opts {
			o.after(&c)
		}
	}()
	host, _, err := net.SplitHostPort(cc.target)
	if err != nil {
		return toRPCErr(err)
	}
	callHdr := &transport.CallHdr{
		Host:   host,
		Method: method,
	}
	topts := &transport.Options{
		Last:  true,
		Delay: false,
	}
	ts := 0
	var lastErr error // record the error that happened
	for {
		var (
			err    error
			t      transport.ClientTransport
			stream *transport.Stream
		)
		// TODO(zhaoq): Need a formal spec of retry strategy for non-failfast rpcs.
		if lastErr != nil && c.failFast {
			return lastErr
		}
		t, ts, err = cc.wait(ctx, ts)
		if err != nil {
			if lastErr != nil {
				// This was a retry; return the error from the last attempt.
				return lastErr
			}
			return err
		}
		stream, err = sendRPC(ctx, callHdr, t, args, topts)
		if err != nil {
			if _, ok := err.(transport.ConnectionError); ok {
				lastErr = err
				continue
			}
			if lastErr != nil {
				return toRPCErr(lastErr)
			}
			return toRPCErr(err)
		}
		// Receive the response
		lastErr = recv(t, &c, stream, reply)
		if _, ok := lastErr.(transport.ConnectionError); ok {
			continue
		}
		t.CloseStream(stream, lastErr)
		if lastErr != nil {
			return toRPCErr(lastErr)
		}
		return Errorf(stream.StatusCode(), stream.StatusDesc())
	}
}