Golang Stream.RecvCompress方法代碼示例

func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}) error {
	// 1. 獲取1幀請求數據
	pf, d, err := p.recvMsg()
	if err != nil {
		return err
	}

	// 2. 壓縮算法在 Stream中都已經通信過?
	if err := checkRecvPayload(pf, s.RecvCompress(), dc); err != nil {
		return err
	}

	// 3. 解壓縮數據
	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
}

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
}

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
}

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())
		}
//.........這裏部分代碼省略.........

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)
//.........這裏部分代碼省略.........

//
// 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.
			// 連接斷開了，則直接返回
			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
		}

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

		// Decode Input
		df := func(v interface{}) error {
			if pf == compressionMade {
				// 如果數據有壓縮，則通過opts中配置的Compressor/Decompressor進行處理
				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
				}
			}

			// 將req中的數據反序列化到: 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
		}

		// 參考: 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,
		//		},
//.........這裏部分代碼省略.........

func (g *grpcServer) processRequest(t transport.ServerTransport, stream *transport.Stream, service *service, mtype *methodType, codec grpc.Codec, ct string, ctx context.Context) (err error) {
	p := &parser{r: stream}
	for {
		pf, req, err := p.recvMsg(defaultMaxMsgSize)
		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 {
					log.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 {
					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 err
		}

		if err := checkRecvPayload(pf, stream.RecvCompress(), nil); err != nil {
			switch err := err.(type) {
			case *rpcError:
				if err := t.WriteStatus(stream, err.code, err.desc); err != nil {
					log.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
				}
			default:
				if err := t.WriteStatus(stream, codes.Internal, err.Error()); err != nil {
					log.Printf("grpc: Server.processUnaryRPC failed to write status %v", err)
				}

			}
			return err
		}

		// status code/desc
		statusCode := codes.OK
		statusDesc := ""

		// exceeds max message size, bail early
		if len(req) > defaultMaxMsgSize {
			statusCode = codes.Internal
			statusDesc = fmt.Sprintf("grpc: server received a message of %d bytes exceeding %d limit", len(req), defaultMaxMsgSize)
			return t.WriteStatus(stream, statusCode, statusDesc)
		}

		var argv, replyv reflect.Value

		// Decode the argument value.
		argIsValue := false // if true, need to indirect before calling.
		if mtype.ArgType.Kind() == reflect.Ptr {
			argv = reflect.New(mtype.ArgType.Elem())
		} else {
			argv = reflect.New(mtype.ArgType)
			argIsValue = true
		}

		// Unmarshal request
		if err := codec.Unmarshal(req, argv.Interface()); err != nil {
			return err
		}

		if argIsValue {
			argv = argv.Elem()
		}

		// reply value
		replyv = reflect.New(mtype.ReplyType.Elem())

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

		// create a client.Request
		r := &rpcRequest{
			service:     g.opts.Name,
			contentType: ct,
			method:      stream.Method(),
			request:     argv.Interface(),
		}

		// define the handler func
		fn := func(ctx context.Context, req server.Request, rsp interface{}) error {
			returnValues = function.Call([]reflect.Value{service.rcvr, mtype.prepareContext(ctx), reflect.ValueOf(req.Request()), reflect.ValueOf(rsp)})

			// The return value for the method is an error.
			if err := returnValues[0].Interface(); err != nil {
				return err.(error)
			}

			return nil
		}
//.........這裏部分代碼省略.........