mirror of https://github.com/grpc/grpc-go.git
72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Binary server demonstrates how to spin up multiple server backends
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// to enable client-side load balancing.
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package main
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import (
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"context"
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"fmt"
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"log"
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"net"
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"sync"
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"google.golang.org/grpc"
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pb "google.golang.org/grpc/examples/features/proto/echo"
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)
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var (
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addrs = []string{":50051", ":50052"}
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)
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type ecServer struct {
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pb.UnimplementedEchoServer
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addr string
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}
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func (s *ecServer) UnaryEcho(_ context.Context, req *pb.EchoRequest) (*pb.EchoResponse, error) {
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return &pb.EchoResponse{Message: fmt.Sprintf("%s (from %s)", req.Message, s.addr)}, nil
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}
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func startServer(addr string) {
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lis, err := net.Listen("tcp", addr)
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if err != nil {
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log.Fatalf("failed to listen: %v", err)
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}
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s := grpc.NewServer()
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pb.RegisterEchoServer(s, &ecServer{addr: addr})
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log.Printf("serving on %s\n", addr)
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if err := s.Serve(lis); err != nil {
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log.Fatalf("failed to serve: %v", err)
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}
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}
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func main() {
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var wg sync.WaitGroup
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for _, addr := range addrs {
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wg.Add(1)
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go func(addr string) {
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defer wg.Done()
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startServer(addr)
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}(addr)
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}
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wg.Wait()
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}
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