golang websocket 手写研究机制

// 处理ws请求
func WsHandler(w http.ResponseWriter, r *http.Request, id string) {
	var conn *websocket.Conn
	var err error
	pingTicker := time.NewTicker(time.Second * 10)
	conn, err = wsupgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Printf("Failed to set websocket upgrade: %+v", err)
		return
	}
	addClient(id, conn)
	m, exist := getMessageChannel(id)
	if !exist {
		m = make(chan interface{})
		addMessageChannel(id, m)
	}
 
	conn.SetCloseHandler(func(code int, text string) error {
		deleteClient(id)
		fmt.Println(code)
		return nil
	})
 
	for {
		select {
		case content, ok := <-m:
			err = conn.WriteJSON(content)
			if err != nil {
				log.Println(err)
				if ok {
					go func() {
						m <- content
					}()
				}
 
				conn.Close()
				deleteClient(id)
				return
			}
		case <-pingTicker.C:
			conn.SetWriteDeadline(time.Now().Add(time.Second * 20))
			if err := conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
				log.Println("send ping err:", err)
				conn.Close()
				deleteClient(id)
				return
			}
		}
	}
 
}