socket.io - keep track of clients

chat.js

// client side code
var socket = io.connect('http://localhost:3000/');

var chatInfra = io.connect('http://localhost:3000/chat_infra'),
    chatCom = io.connect('http://localhost:3000/chat_com');

chatInfra.on('name_set', function (data) {
    chatInfra.on("user_entered", function (user) {
        $('#messages').append('<div class="systemMessage">' + user.name + ' has joined the room.' + '</div>');
    });
    chatInfra.on('message', function (message) {
        var message = JSON.parse(message);
        $('#messages').append('<div class="' + message.type + '">' + message.message + '</div>');
    });
    chatCom.on('message', function (message) {
        var message = JSON.parse(message);
        $('#messages').append('<div class="' + message.type + '"><span class="name">' + message.username + ":</span> " + message.message + '</div>');
    });

    $('#nameform').hide();
    $('#messages').append('<div class="systemMessage">Hello ' + data.name + '</div>');
    $('#send').click(function () {
        var data = {
            message:$('#message').val(),
            type:'userMessage'
        };
        chatCom.send(JSON.stringify(data));
        $('#message').val('');
    });

});

$(function () {
    $('#setname').click(function () {
       // fetch logged in user's name and send it to the server.
        chatInfra.emit("set_name", {name:$('#nickname').val()});
    });
});

sockets.js

// Server side code
    io = io.listen(server);
    var clients = [];

    var chatInfra = io.of("/chat_infra").on("connection", function(socket){ // fix logged in users
        socket.on("set_name", function (data) {
            clients.push(data.name);  // store users into array
            socket.emit('name_set', data);
            socket.send(JSON.stringify({type:'serverMessage', message:'Welcome to the most interesting ' + 'chat room on earth!'}));
            socket.broadcast.emit('user_entered', data);
        });
    });

    var chatCom = io.of("/chat_com").on("connection", function (socket) { // handle messageing between users
        socket.on('message', function (message) {
            message = JSON.parse(message);
            for(var key in clients){ // itarate over users
            
                if(message.type == "userMessage"){
                    message.username = clients[key];
                    socket.broadcast.send(JSON.stringify(message));
                    message.type = "myMessage";
                    socket.send(JSON.stringify(message));
                }
            }

        });
    });