websocket 的心跳请求

func writer(ws *websocket.Conn) {
	pingTicker := time.NewTicker(time.Second * 1)
	fileTicker := time.NewTicker(time.Second * 1)
	defer func() {
		pingTicker.Stop()
		fileTicker.Stop()
		ws.Close()
	}()

	for {
		select {
		case <-fileTicker.C:
			ws.SetWriteDeadline(time.Now().Add(time.Second * 2))
			fmt.Println("------>hello")
			if err := ws.WriteMessage(websocket.TextMessage, []byte("hello")); err != nil {
				fmt.Println("send msg err:", err)
				return
			}
		case <-pingTicker.C:
			ws.SetWriteDeadline(time.Now().Add(time.Second * 2))
			fmt.Println("---->send ping")
			if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
				fmt.Println("send ping err:", err)
				return
			}
		}
	}
}
func reader(ws *websocket.Conn) {
	ws.SetReadLimit(512)
	ws.SetReadDeadline(time.Now().Add(time.Second * 2))
	ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(time.Second * 2)); return nil })
	defer ws.Close()
	for {
		t, msg, err := ws.ReadMessage()
		fmt.Println("server recieve t:", t)
		fmt.Println("server recieve body:", string(msg))
		if err != nil {
			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
				fmt.Println("error:", err)
			}
			return
		}
		time.Sleep(time.Second *5)
	}
}

在 main 函数中,writer 函数必须加关键字 go，开启两个定时器，一个定时向客户端推送消息，一个定时 ping 客户端检测是否连接正常。如果断开显示send ping err: write tcp 127.0.0.1:3000->127.0.0.1:62228: write: broken pipe。但是感觉这个 ping 的定时器没啥用啊，如果客户端断开，WriteMessage 这个方法就会报错退出，那这个 ping 效果和它一样的，请问还有必要吗？

go writer(conn)
go reader(conn)