| 74 | } |
| 75 | |
| 76 | func main() { |
| 77 | flag.Parse() |
| 78 | |
| 79 | address := fmt.Sprintf(":%v", *port) |
| 80 | lis, err := net.Listen("tcp", address) |
| 81 | if err != nil { |
| 82 | log.Fatalf("failed to listen: %v", err) |
| 83 | } |
| 84 | |
| 85 | s := grpc.NewServer() |
| 86 | ss := &server{streamStart: make(chan struct{})} |
| 87 | pb.RegisterEchoServer(s, ss) |
| 88 | serverStopped := make(chan struct{}, 1) |
| 89 | |
| 90 | go func() { |
| 91 | <-ss.streamStart // wait until server streaming starts |
| 92 | time.Sleep(1 * time.Second) |
| 93 | log.Println("Initiating graceful shutdown...") |
| 94 | timer := time.AfterFunc(10*time.Second, func() { |
| 95 | log.Println("Server couldn't stop gracefully in time. Doing force stop.") |
| 96 | s.Stop() |
| 97 | // Unblock the main function. |
| 98 | select { |
| 99 | case serverStopped <- struct{}{}: |
| 100 | default: |
| 101 | } |
| 102 | }) |
| 103 | defer timer.Stop() |
| 104 | s.GracefulStop() // gracefully stop server after in-flight server streaming rpc finishes |
| 105 | log.Println("Server stopped gracefully.") |
| 106 | // Unblock the main function. |
| 107 | select { |
| 108 | case serverStopped <- struct{}{}: |
| 109 | default: |
| 110 | } |
| 111 | }() |
| 112 | |
| 113 | if err := s.Serve(lis); err != nil { |
| 114 | log.Fatalf("failed to serve: %v", err) |
| 115 | } |
| 116 | <-serverStopped |
| 117 | } |