Socket.io: check the status of a connection with the socket id

Question

I have a socket id of a connection. Can I get the status of that connection, inside the function handler of another one?

Something like this:

io.sockets.on('connection', function(socket) {
    /* having the socket id of *another* connection, I can
     * check its status here.
     */
    io.sockets[other_socket_id].status
}

Is there a way to do so?

Answer 1

As of today, Feb, 2015, none of the methods listed here work on the current version of Socket.io (1.1.0). So on this version, this is how it works for me :

var socketList = io.sockets.server.eio.clients;
            if (socketList[user.socketid] === undefined){

the io.sockets.server.eio.clients is an array containing a list of all the live socket id's. So use the code in the if statement to check if a particular socket ID is in this list.

Answer 2

In the newer versions, you can check socket.connected property.

var socket = io(myEndpoint)
console.log(socket.connected) // logs true or false

Also you can set timeout

setTimeout(function() {
    if(! socket.connected) {
        throw new Error('some error')
    }
}, 5000)

This checks if socket connected in 5 seconds.