golang graceful shutdown tcp listener

graceful_tcp_server.go

	cmdAddr, _ := net.ResolveTCPAddr("tcp", n.cfg.Addr)
	lcmd, err := net.ListenTCP("tcp", cmdAddr)
	if err != nil {
		log.Fatalln(err)
	}
	defer lcmd.Close()
	quitChan := make(chan os.Signal, 1)
	signal.Notify(quitChan, os.Interrupt, os.Kill, syscall.SIGTERM)
	wg := sync.WaitGroup{}
	for {
		select {
		case <-quitChan:
			lcmd.Close()
			wg.Wait()
			return
		default:
		}
		lcmd.SetDeadline(time.Now().Add(1e9))
		conn, err := lcmd.AcceptTCP()
		if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
			continue
		}
		if err != nil {
			log.WithError(err).Errorln("Listener accept")
			continue
		}
		wg.Add(1)
		go func(){
			wg.Done()
			n.handleRequest(conn)
		}
		
  }