mirror of https://github.com/grpc/grpc-go.git
137 lines
3.0 KiB
Go
137 lines
3.0 KiB
Go
/*
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*
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* Copyright 2020 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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// Package main starts Greeter service that will response with the hostname.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"math/rand"
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"net"
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"os"
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"strconv"
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"time"
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"google.golang.org/grpc"
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pb "google.golang.org/grpc/examples/helloworld/helloworld"
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"google.golang.org/grpc/health"
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healthpb "google.golang.org/grpc/health/grpc_health_v1"
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"google.golang.org/grpc/reflection"
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)
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var help = flag.Bool("help", false, "Print usage information")
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const (
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defaultPort = 50051
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)
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// server is used to implement helloworld.GreeterServer.
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type server struct {
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pb.UnimplementedGreeterServer
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serverName string
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}
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func newServer(serverName string) *server {
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return &server{
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serverName: serverName,
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}
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}
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// SayHello implements helloworld.GreeterServer
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func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
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log.Printf("Received: %v", in.GetName())
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return &pb.HelloReply{Message: "Hello " + in.GetName() + ", from " + s.serverName}, nil
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}
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func determineHostname() string {
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hostname, err := os.Hostname()
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if err != nil {
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log.Printf("Failed to get hostname: %v, will generate one", err)
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rand.Seed(time.Now().UnixNano())
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return fmt.Sprintf("generated-%03d", rand.Int()%100)
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}
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return hostname
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}
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func init() {
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flag.Usage = func() {
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fmt.Fprintf(flag.CommandLine.Output(), `
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Usage: server [port [hostname]]
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port
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The listen port. Defaults to %d
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hostname
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The name clients will see in greet responses. Defaults to the machine's hostname
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`, defaultPort)
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flag.PrintDefaults()
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}
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}
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func main() {
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flag.Parse()
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if *help {
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flag.Usage()
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return
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}
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args := flag.Args()
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if len(args) > 2 {
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flag.Usage()
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return
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}
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port := defaultPort
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if len(args) > 0 {
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var err error
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port, err = strconv.Atoi(args[0])
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if err != nil {
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log.Printf("Invalid port number: %v", err)
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flag.Usage()
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return
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}
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}
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var hostname string
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if len(args) > 1 {
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hostname = args[1]
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}
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if hostname == "" {
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hostname = determineHostname()
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}
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lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", port))
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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.RegisterGreeterServer(s, newServer(hostname))
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reflection.Register(s)
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healthServer := health.NewServer()
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healthServer.SetServingStatus("", healthpb.HealthCheckResponse_SERVING)
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healthpb.RegisterHealthServer(s, healthServer)
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log.Printf("serving on %s, hostname %s", lis.Addr(), hostname)
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s.Serve(lis)
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}
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