How to turn-off event sending after reconnection?

[hyperknot]

I would like to send non-volatile (thus "normal") events, but I'd like to turn off the "remember events and send them after reconnection" behaviour. How is it possible to achieve this?

[hyperknot]

So far what seems to be working is to keep a this.connected variable and set it to false in a socket.on('disconnect') event. Then wrap every emit in a if (this.connected) {socket.emit()} block.

From my experimentation it seems that:

• events which are sent before "realizing" the disconnection fact (first unanswered ping) simply disappear
• events after the disconnection are not sent because of the client side logic

Can someone confirm this is the right logic to do this?

[darrachequesne]

There are several solutions, depending on your use case:

• use the connected attribute (as you suggested)

if (socket.connected) {
  socket.emit( /* ... */ );
} else {
  // ...
}

• empty the internal buffer upon connection

socket.on("connect", () => {
  socket.sendBuffer = [];
});

• use the volatile flag

socket.volatile.emit( /* ... */ );

I think this is currently missing from the documentation, I will definitely add this.

[hyperknot]

Thanks a lot for clarifying this!

[darrachequesne]

You're welcome! I've added it here: https://socket.io/docs/v3/client-offline-behavior/