I am currently working on a project with socket.io, and i'm not sure to fully understand the mechanism of reconnection.
Since a disconnection could happen client side, i would like to know how to maintain the state of the socket on the server. I already know that socket.io-client will try to reconnect automatically, but i would like to know if it is possible to ensure the state of the socket on the server side.
I was thinking of a cookie based session, with express for example, but again i am not sure if i'm taking the good way about this. Is there another solution i should consider?
For the record, i successfully configured HAProxy with a cookie based sticky-sessions mechanism. Could it be possible to mix this mechanism with a cookie session on the socket.io server ?
Thanks
William
I think cookie based sessions are your best option. Look into the session.socket.io module. Looks like it was built specifically for this.
var SessionSockets = require('session.socket.io');
var sessionSockets = new SessionSockets(io, sessionStore, cookieParser);
sessionSockets.on('connection', function (err, socket, session) {
//your regular socket.io code goes here
//and you can still use your io object
session.foo = 'bar';
//at this point the value is not yet saved into the session
session.save();
//now you can read session.foo from your express routes or connect middlewares
});
Alternatively you could implement sessions yourself using express as you mentioned. I don't know of any easy way to integrate with HAProxy.