How to reconnect in Pubnub?

问题

I am using PubNub for notifications transfer across my Js code. I am unable to figure out how to reconnect in PubNub once internet disconnects and comes back up.

having restore: true in my init and doing

this.listeners = {
  message: msgEvent => {
    console.log(msgEvent);
  },
  status: statusEvent => {
    if (statusEvent.category === "PNNetworkUpCategory") {
      this.pubnub.reconnect();
}}};

Doesn't work for me.

full code:

this.pubnub = new PubNub({
  subscribeKey: this.serverDetails.authInfo.subscribeKey,
  authKey: this.serverDetails.authInfo.authKey,
  uuid,
  restore: true
  ssl: true
});

this.listeners = {
  message: msgEvent => {
    console.log(msgEvent);
  },
  status: statusEvent => {
    if (statusEvent.category === "PNNetworkUpCategory") {
      this.pubnub.reconnect();
    }
  }
};

this.pubnub.addListener(this.listeners);

SDK: 4.27.2

expectation: try to Reconnect PubNub max N tries) ,subscribe to existing subscribed channels.

回答1:

this.pubnub = new PubNub({
        subscribeKey: this.serverDetails.authInfo.subscribeKey,
        authKey: this.serverDetails.authInfo.authKey,
        uuid,
        restore:true,
        ssl: true,
    });

this.listeners = {
        message: (msgEvent) => {
            console.dir(msgEvent);
            }
        status: statusEvent => {
            if (statusEvent.category === "PNNetworkUpCategory") {
                this.pubnub.subscribe();
            }
    };

this.pubnub.addListener(this.listeners);

Should work.

回答2:

Looking at it you are possibly getting some other status response that you are not checking for...Also I think you would require the autoNetworkDetection flag to announce when the network is down or up using the states PNNetworkDownCategory and PNNetworkUpCategory. i.e.

this.pubnub = new PubNub({
  subscribeKey: this.serverDetails.authInfo.subscribeKey,
  authKey: this.serverDetails.authInfo.authKey,
  uuid,
  restore: true,
  ssl: true,
  autoNetworkDetection: true
});

this.listeners = {
  message: msgEvent => {
    console.log(msgEvent);
  },
  status: statusEvent => {
    if (statusEvent.category === "PNNetworkUpCategory") {
      this.pubnub.reconnect();
    } else {
      // check for other status events - PNTimeoutCategory, PNNetworkIssuesCategory, etc
      console.log(statusEvent.category);
    } 
  }
};

If that fails and you still get reconnection issues you should set the flag listenToBrowserNetworkEvent to false as this allows the SDK reconnection logic to take over. i.e.

this.pubnub = new PubNub({
  subscribeKey: this.serverDetails.authInfo.subscribeKey,
  authKey: this.serverDetails.authInfo.authKey,
  uuid,
  restore: true,
  ssl: true,
  listenToBrowserNetworkEvents: false
});

see: https://www.pubnub.com/docs/web-javascript/pubnub-network-lifecycle#pnnetworkupcategory

来源：https://stackoverflow.com/questions/61064086/how-to-reconnect-in-pubnub

标签

javascript

publish-subscribe

pubnub