<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
export default {
  name: "app",
  data() {
    return {
      // socket参数
      socket: null,
      timeout: 10 * 1000, // 45秒一次心跳
      timeoutObj: null, // 心跳心跳倒计时
      serverTimeoutObj: null, // 心跳倒计时
      timeoutnum: null, // 断开 重连倒计时
      lockReconnect: false, // 防止
      websocket: null
    };
  },
  watch: {},
  created() {
    window.addEventListener('beforeunload', e => this.closeWebSocket(e));
  },
  mounted() {
    this.initWebSocket('pc'); // userId为socket链接的参数
  },
  beforeDestroy() {
    window.addEventListener('beforeunload', e => this.closeWebSocket(e));
  },
  methods: {
    initWebSocket(supplierId) {
      // WebSocket与普通的请求所用协议有所不同，ws等同于http，wss等同于https
      let wsUrl = `ws://192.168.3.32:81/websocket/${supplierId}`;
      this.websocket = new WebSocket(wsUrl);
      this.websocket.onopen = this.websocketonopen;
      this.websocket.onerror = this.websocketonerror;
      this.websocket.onmessage = this.setOnmessageMessage;
      this.websocket.onclose = this.websocketclose;
    },
    start() {
      // console.log('start');
      //清除延时器
      this.timeoutObj && clearTimeout(this.timeoutObj);
      this.serverTimeoutObj && clearTimeout(this.serverTimeoutObj);
      this.timeoutObj = setTimeout(() => {
        if (this.websocket && this.websocket.readyState == 1) {
          this.websocket.send('heartBath');//发送消息，服务端返回信息，即表示连接良好，可以在socket的onmessage事件重置心跳机制函数
        } else {
          this.reconnect();
        }
        //定义一个延时器等待服务器响应，若超时，则关闭连接，重新请求server建立socket连接
        this.serverTimeoutObj = setTimeout(() => {
          this.websocket.close();
        }, this.timeout)
      }, this.timeout)
    },
    reset() { // 重置心跳
      // 清除时间
      clearTimeout(this.timeoutObj);
      clearTimeout(this.serverTimeoutObj);
      // 重启心跳
      this.start();
    },
    // 重新连接
    reconnect() {
      if (this.lockReconnect) return
      this.lockReconnect = true;
      //没连接上会一直重连，设置延迟避免请求过多
      this.timeoutnum && clearTimeout(this.timeoutnum);
      this.timeoutnum = setTimeout(() => {
        this.initWebSocket('pc');
        this.lockReconnect = false;
      }, 5000)
    },
    async setOnmessageMessage(event) {
      // console.log(event.data, '获得消息');
      this.reset();
      // 自定义全局监听事件
      window.dispatchEvent(new CustomEvent('onmessageWS', {
        detail: {
          data: event.data
        }
      }))
      // //发现消息进入    开始处理前端触发逻辑
      // if (event.data === 'success' || event.data === 'heartBath') return
    },
    websocketonopen() {
      //开启心跳
      this.start();
      console.log("WebSocket连接成功!!!" + new Date() + "----" + this.websocket.readyState);
    },
    websocketonerror(e) {
      console.log("WebSocket连接发生错误" + e);
    },
    websocketclose(e) {
      this.websocket.close();
      clearTimeout(this.timeoutObj);
      clearTimeout(this.serverTimeoutObj);
      console.log("WebSocket连接关闭");
      this.reconnect();//重连
    },
    websocketsend(messsage) {
      this.websocket.send(messsage)
    },
    closeWebSocket() { // 关闭websocket
      this.websocket.close()
    },
  },
  computed: {}
};
</script>
<style lang="scss">
#app {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.avue--detail .el-col {
  margin-bottom: 0;
}
</style>
