Golang MethodDescriptorProto.GetClientStreaming方法代码示例

// generateClientSignature returns the client-side signature for a method.
func (g *grpc) generateClientSignature(servName string, method *pb.MethodDescriptorProto) string {
	origMethName := method.GetName()
	methName := generator.CamelCase(origMethName)
	if reservedClientName[methName] {
		methName += "_"
	}
	reqArg := ", in *" + g.typeName(method.GetInputType())
	if method.GetClientStreaming() {
		reqArg = ""
	}
	respName := "*" + g.typeName(method.GetOutputType())
	if method.GetServerStreaming() || method.GetClientStreaming() {
		respName = servName + "_" + generator.CamelCase(origMethName) + "Client"
	}
	return fmt.Sprintf("%s(ctx %s.Context%s, opts ...%s.CallOption) (%s, error)", methName, contextPkg, reqArg, grpcPkg, respName)
}

// generateServerSignature returns the server-side signature for a method.
func (g *svcauth) generateServerCall(servName string, method *pb.MethodDescriptorProto) string {
	origMethName := method.GetName()
	methName := generator.CamelCase(origMethName)
	if reservedClientName[methName] {
		methName += "_"
	}

	var reqArgs []string
	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		reqArgs = append(reqArgs, "ctx")
	}
	if !method.GetClientStreaming() {
		reqArgs = append(reqArgs, "input")
	}
	if method.GetServerStreaming() || method.GetClientStreaming() {
		reqArgs = append(reqArgs, "stream")
	}

	return methName + "(" + strings.Join(reqArgs, ", ") + ") "
}

// generateServerSignature returns the server-side signature for a method.
func (g *grpc) generateServerSignature(servName string, method *pb.MethodDescriptorProto) string {
	origMethName := method.GetName()
	methName := generator.CamelCase(origMethName)
	if reservedClientName[methName] {
		methName += "_"
	}

	var reqArgs []string
	ret := "error"
	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		reqArgs = append(reqArgs, contextPkg+".Context")
		ret = "(*" + g.typeName(method.GetOutputType()) + ", error)"
	}
	if !method.GetClientStreaming() {
		reqArgs = append(reqArgs, "*"+g.typeName(method.GetInputType()))
	}
	if method.GetServerStreaming() || method.GetClientStreaming() {
		reqArgs = append(reqArgs, servName+"_"+generator.CamelCase(origMethName)+"Server")
	}

	return methName + "(" + strings.Join(reqArgs, ", ") + ") " + ret
}

func (g *grpc) generateServerMethod(servName, fullServName string, method *pb.MethodDescriptorProto) string {
	methName := generator.CamelCase(method.GetName())
	hname := fmt.Sprintf("_%s_%s_Handler", servName, methName)
	inType := g.typeName(method.GetInputType())
	outType := g.typeName(method.GetOutputType())

	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		g.P("func ", hname, "(srv interface{}, ctx ", contextPkg, ".Context, dec func(interface{}) error, interceptor ", grpcPkg, ".UnaryServerInterceptor) (interface{}, error) {")
		g.P("in := new(", inType, ")")
		g.P("if err := dec(in); err != nil { return nil, err }")
		g.P("if interceptor == nil { return srv.(", servName, "Server).", methName, "(ctx, in) }")
		g.P("info := &", grpcPkg, ".UnaryServerInfo{")
		g.P("Server: srv,")
		g.P("FullMethod: ", strconv.Quote(fmt.Sprintf("/%s/%s", fullServName, methName)), ",")
		g.P("}")
		g.P("handler := func(ctx ", contextPkg, ".Context, req interface{}) (interface{}, error) {")
		g.P("return srv.(", servName, "Server).", methName, "(ctx, req.(*", inType, "))")
		g.P("}")
		g.P("return interceptor(ctx, in, info, handler)")
		g.P("}")
		g.P()
		return hname
	}
	streamType := unexport(servName) + methName + "Server"
	g.P("func ", hname, "(srv interface{}, stream ", grpcPkg, ".ServerStream) error {")
	if !method.GetClientStreaming() {
		g.P("m := new(", inType, ")")
		g.P("if err := stream.RecvMsg(m); err != nil { return err }")
		g.P("return srv.(", servName, "Server).", methName, "(m, &", streamType, "{stream})")
	} else {
		g.P("return srv.(", servName, "Server).", methName, "(&", streamType, "{stream})")
	}
	g.P("}")
	g.P()

	genSend := method.GetServerStreaming()
	genSendAndClose := !method.GetServerStreaming()
	genRecv := method.GetClientStreaming()

	// Stream auxiliary types and methods.
	g.P("type ", servName, "_", methName, "Server interface {")
	if genSend {
		g.P("Send(*", outType, ") error")
	}
	if genSendAndClose {
		g.P("SendAndClose(*", outType, ") error")
	}
	if genRecv {
		g.P("Recv() (*", inType, ", error)")
	}
	g.P(grpcPkg, ".ServerStream")
	g.P("}")
	g.P()

	g.P("type ", streamType, " struct {")
	g.P(grpcPkg, ".ServerStream")
	g.P("}")
	g.P()

	if genSend {
		g.P("func (x *", streamType, ") Send(m *", outType, ") error {")
		g.P("return x.ServerStream.SendMsg(m)")
		g.P("}")
		g.P()
	}
	if genSendAndClose {
		g.P("func (x *", streamType, ") SendAndClose(m *", outType, ") error {")
		g.P("return x.ServerStream.SendMsg(m)")
		g.P("}")
		g.P()
	}
	if genRecv {
		g.P("func (x *", streamType, ") Recv() (*", inType, ", error) {")
		g.P("m := new(", inType, ")")
		g.P("if err := x.ServerStream.RecvMsg(m); err != nil { return nil, err }")
		g.P("return m, nil")
		g.P("}")
		g.P()
	}

	return hname
}

func (g *grpc) generateClientMethod(servName, fullServName, serviceDescVar string, method *pb.MethodDescriptorProto, descExpr string) {
	sname := fmt.Sprintf("/%s/%s", fullServName, method.GetName())
	methName := generator.CamelCase(method.GetName())
	inType := g.typeName(method.GetInputType())
	outType := g.typeName(method.GetOutputType())

	g.P("func (c *", unexport(servName), "Client) ", g.generateClientSignature(servName, method), "{")
	if !method.GetServerStreaming() && !method.GetClientStreaming() {
		g.P("out := new(", outType, ")")
		// TODO: Pass descExpr to Invoke.
		g.P("err := ", grpcPkg, `.Invoke(ctx, "`, sname, `", in, out, c.cc, opts...)`)
		g.P("if err != nil { return nil, err }")
		g.P("return out, nil")
		g.P("}")
		g.P()
		return
	}
	streamType := unexport(servName) + methName + "Client"
	g.P("stream, err := ", grpcPkg, ".NewClientStream(ctx, ", descExpr, `, c.cc, "`, sname, `", opts...)`)
	g.P("if err != nil { return nil, err }")
	g.P("x := &", streamType, "{stream}")
	if !method.GetClientStreaming() {
		g.P("if err := x.ClientStream.SendMsg(in); err != nil { return nil, err }")
		g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
	}
	g.P("return x, nil")
	g.P("}")
	g.P()

	genSend := method.GetClientStreaming()
	genRecv := method.GetServerStreaming()
	genCloseAndRecv := !method.GetServerStreaming()

	// Stream auxiliary types and methods.
	g.P("type ", servName, "_", methName, "Client interface {")
	if genSend {
		g.P("Send(*", inType, ") error")
	}
	if genRecv {
		g.P("Recv() (*", outType, ", error)")
	}
	if genCloseAndRecv {
		g.P("CloseAndRecv() (*", outType, ", error)")
	}
	g.P(grpcPkg, ".ClientStream")
	g.P("}")
	g.P()

	g.P("type ", streamType, " struct {")
	g.P(grpcPkg, ".ClientStream")
	g.P("}")
	g.P()

	if genSend {
		g.P("func (x *", streamType, ") Send(m *", inType, ") error {")
		g.P("return x.ClientStream.SendMsg(m)")
		g.P("}")
		g.P()
	}
	if genRecv {
		g.P("func (x *", streamType, ") Recv() (*", outType, ", error) {")
		g.P("m := new(", outType, ")")
		g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
		g.P("return m, nil")
		g.P("}")
		g.P()
	}
	if genCloseAndRecv {
		g.P("func (x *", streamType, ") CloseAndRecv() (*", outType, ", error) {")
		g.P("if err := x.ClientStream.CloseSend(); err != nil { return nil, err }")
		g.P("m := new(", outType, ")")
		g.P("if err := x.ClientStream.RecvMsg(m); err != nil { return nil, err }")
		g.P("return m, nil")
		g.P("}")
		g.P()
	}
}