Sails + Check Session - node.js

Question

I am using SailsJS and Socket.IO.
Currently I need to know if a user's session is expired or not.
Once user's session is expired I need to disconnect socket connection for that user.
One way to do it is using CRON for every 30 minutes and checking if user is still logged in.
Is there any way I can check if user's session still exists without using CRON.
Thanks in Advance

Answer 1

As luck would have it, Node is Javascript and Javascript makes this sort of thing very easy. You can just use setInterval like in a regular ol' front-end script. So, assuming you have a User model with an expiresOn field you can check do something like the following in your config/bootstrap.js:
module.exports = function(cb) {
// Schedule disconnectExpiredUsers to run once a minute
setInterval(disconnectExpiredUsers, 60000);
// Function to loop through all expired users and disconnect them
function disconnectExpiredUsers() {
var now = new Date();
User.find({expiresOn: {'<': now}}).exec(function(err, expiredUsers) {
// Handle errors somehow
if (err) {
return console.log(err);
}
// Loop through expired users (lodash is globalized by Sails)
_.each(expiredUsers, function(expiredUser) {
// Since you're using resourceful pubsub (right???),
// we can get all of the instance's sockets easily
var sockets = User.subscribers(expiredUser);
// And we can send them a message
User.publishMessage(expiredUser, "Session expired, buddy!");
// And disconnect them, but use nextTick to make sure the messages
// go out first
process.nextTick(function() {
_.each(sockets, function(socket) {socket.disconnect();});
});
});
});
}
};
This also assumes you're using Sails' resourceful pubsub to subscribe sockets to your User instances; otherwise you'll have to keep track of the IDs of connected sockets yourself.

Answer 2

You can do this by adding policy to all route
Simply add sessionAuth.js to policy folder
module.exports = function(req, res, next) {
// If you are not using passport then set your own logic
/*if (req.session.authenticated) {
return next();
}*/
// if you are using passport then
if(req.isAuthenticated()) {
return next();
}
//else
// Write your code for socket disconnect
// or send json res like this
return res.json({msg:'You are not loggedin, Please Login !'})
};
Now go to config/policies.js
And apply this policy to all routes
module.exports.policies = {
'*': 'sessionAuth'
}