examples/features/reflection/server/main.go

/*
 *
 * Copyright 2019 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.
 *
 */

// Binary server demonstrates how to register multiple services and enable
// client discovery.
package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"net"

	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"

	ecpb "google.golang.org/grpc/examples/features/proto/echo"
	hwpb "google.golang.org/grpc/examples/helloworld/helloworld"
)

var port = flag.Int("port", 50051, "the port to serve on")

// hwServer is used to implement helloworld.GreeterServer.
type hwServer struct {
	hwpb.UnimplementedGreeterServer
}

// SayHello implements helloworld.GreeterServer
func (s *hwServer) SayHello(_ context.Context, in *hwpb.HelloRequest) (*hwpb.HelloReply, error) {
	return &hwpb.HelloReply{Message: "Hello " + in.Name}, nil
}

type ecServer struct {
	ecpb.UnimplementedEchoServer
}

func (s *ecServer) UnaryEcho(_ context.Context, req *ecpb.EchoRequest) (*ecpb.EchoResponse, error) {
	return &ecpb.EchoResponse{Message: req.Message}, nil
}

func main() {
	flag.Parse()
	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	fmt.Printf("server listening at %v\n", lis.Addr())

	s := grpc.NewServer()

	// Register Greeter on the server.
	hwpb.RegisterGreeterServer(s, &hwServer{})

	// Register RouteGuide on the same server.
	ecpb.RegisterEchoServer(s, &ecServer{})

	// Register reflection service on gRPC server.
	reflection.Register(s)

	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}