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

Question

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

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?

javascript
node.js
socket.io

Answer 1

You can access any connected socket with io.sockets.sockets[a_socket_id], so if you've set a status variable on it, io.sockets.sockets[a_socket_id].status will work.

First you should check if the socket really exists, and it can also be used to check connected/disconnected statuses.

if(io.sockets.sockets[a_socket_id]!=undefined){
  console.log(io.sockets.sockets[a_socket_id]); 
}else{
  console.log("Socket not connected");
}

Answer 2

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 3

Socket.io >= 1.0, as Riwels answer, first you should check if the socket exists

if(io.sockets.connected[a_socket_id]!=undefined){
    console.log(io.sockets.connected[a_socket_id].connected); //or disconected property
}else{
    console.log("Socket not connected");
}

Answer 4

if (io.sockets.connected[socketID]) { 
    // do what you want 
}