Sharing session with Socket.io both ways

I’ve seen a number of tutorials of how to share an express session with socket.io. However, they all usually show how to SET from express and then GET from within the socket connection. (server)

Is there a way to do this where you can SET from within the socket connection?

io.on('connection', function(socket){
  socket.request.session.userdata = mydata;
});

[dougwilson]

var express = require('express')
var expressSession = require('express-session')
var http = require('http')
var io = require('socket.io')

var session = expressSession({ /* configuration */ })

// middleware
app.use(session)

// routes
app.get('/', function() {})

// setup servers
var server = http.createServer(app);
var sio = io.listen(server);

// setup socket auth with sessions
sio.set('authorization', function(handshake, accept) {
  session(handshake, {}, function (err) {
    if (err) return accept(err)
    var session = socket.handshake.session;
    // check the session is valid
    accept(null, session.userid != null)
  })
})

// setup socket connections to have the session on them
sio.sockets.on('connection', function (socket) {
  session(socket.handshake, {}, function (err) {
    if (err) { /* handle error */ }
    var session = socket.handshake.session;
    // do stuff

    // alter session
    session.userdata = mydata

    // and save session
    session.save(function (err) { /* handle error */ })
  })
})

[knoxcard]

Funny, I actually had to read this post to do the opposite. My NodeJs controller /logout was being called but my socket.io middleware kept bringing the user session back to life. Had to get rid of session.touch.save() and now everything works great!