websocket心跳包

HeartPongWebsocket.js

/**
 * `WebsocketHeartbeatJs` constructor.
 *
 * @param {Object} opts
 * {
 *  url                  websocket链接地址
 *  pingTimeout 未收到消息多少秒之后发送ping请求，默认15000毫秒
    pongTimeout  发送ping之后，未收到消息超时时间，默认10000毫秒
    reconnectTimeout onreconnect之后2秒， 进行init
    pingMsg
 * }
 * @api public
 */

function WebsocketHeartbeatJs({
  url,
  pingTimeout = 15000,
  pongTimeout = 20000,
  reconnectTimeout = 2000,
  pingMsg = 'ping',
}){
  this.opts = {
    url: url,
    pingTimeout: pingTimeout,
    pongTimeout: pongTimeout,
    reconnectTimeout: reconnectTimeout,
    pingMsg: pingMsg,
  };
  this.ws = null; // websocket实例

  // override hook function
  this.onclose = () => {};
  this.onerror = () => {};
  this.onopen = () => {};
  this.onmessage = () => {};
  this.onreconnect = () => {};

  this.createWebSocket();
}
WebsocketHeartbeatJs.prototype.createWebSocket = function(){
  try {
    this.ws = new WebSocket(this.opts.url);
    this.initEventHandle();
  } catch (e) {
    // this.reconnect();  // 暂时注释掉重连， 配合后端
    throw e;
  }
};

WebsocketHeartbeatJs.prototype.initEventHandle = function() {
  this.ws.onclose = () => {
    this.onclose();
    // this.reconnect(); // 暂时注释掉重连， 配合后端
  };
  this.ws.onerror = () => {
    this.onerror();
    // this.reconnect(); // 暂时注释掉重连， 配合后端
  };
  this.ws.onopen = () => {
    this.onopen();
    //心跳检测重置
    this.heartCheck();
  };
  this.ws.onmessage = (event) => {
    this.onmessage(event);
    //如果获取到消息，心跳检测重置
    //拿到任何消息都说明当前连接是正常的
    this.heartCheck();
  };
};

WebsocketHeartbeatJs.prototype.reconnect = function(){
  if(this.lockReconnect || this.forbidReconnect) return;
  this.lockReconnect = true;
  this.onreconnect();
  //没连接上会一直重连，设置延迟避免请求过多
  setTimeout(() => {
    this.createWebSocket();
    this.lockReconnect = false;
  }, this.opts.reconnectTimeout);
};
WebsocketHeartbeatJs.prototype.send = function(msg){
  this.ws.send(msg);
};
//心跳检测
WebsocketHeartbeatJs.prototype.heartCheck = function(){
  this.heartReset();
  this.heartStart();
};
WebsocketHeartbeatJs.prototype.heartStart = function(){
  if(this.forbidReconnect) return;//不再重连就不再执行心跳
    this.pingTimeoutId = setTimeout(() => {
      //这里发送一个心跳，后端收到后，返回一个心跳消息，
      //onmessage拿到返回的心跳就说明连接正常
      this.ws.send(this.opts.pingMsg);
      // // 后端未加重连，因此注释掉该段。
      /*  start 如果超过一定时间还没重置，说明后端主动断开了 */
      // this.pongTimeoutId = setTimeout(() => {
      //   //如果onclose会执行reconnect，我们执行ws.close()就行了.如果直接执行reconnect 会触发onclose导致重连两次
      //   this.ws.close();
      // }, this.opts.pongTimeout);
      /*  end 如果超过一定时间还没重置，说明后端主动断开了 */
  }, this.opts.pingTimeout);
};
WebsocketHeartbeatJs.prototype.heartReset = function(){
  clearTimeout(this.pingTimeoutId);
  clearTimeout(this.pongTimeoutId);
};
WebsocketHeartbeatJs.prototype.close = function(){
  //如果手动关闭连接，不再重连
  this.forbidReconnect = true;
  this.heartReset();
  this.ws.close();
};
if(window) window.WebsocketHeartbeatJs = WebsocketHeartbeatJs;
export default WebsocketHeartbeatJs;

使用的文件：

import HeartPongWebSocketF from './knowledgeDialog/HeartPongWebSocketF'; // websocket 心跳包

const WEB_URL = 'xxxxxx';
this.ws = new HeartPongWebSocketF({ url: WEB_URL });