Server.js (Ping!)

var util = require("util"),
    io = require("socket.io");

var socket, // We'll save the socket object here (see init)
    players, // I say players because I plan on making this into a small game
    events; // Keep track of events

// Setup the server //
function init() {
    players = [];
    events = 0;
    socket = io.listen(8000); // Start listening for connections
    socket.configure(function() {
        socket.set("transports", ["websocket"]); // Only websockets for now
        socket.set("log level", 2);
    });
    setEventHandlers();
};

// Set event handlers //
function setEventHandlers() {
    socket.sockets.on("connection", onSocketConnection);
}

// Do this each time a client connects //
function onSocketConnection(client) {
    util.log("Connection: "+client.id);
    players.push(client);
    client.on("disconnect", onClientDisconnect);
    client.on("ping", onClientPing);
    client.on("goodbye", onPart);
    client.on("msg", onMessage);
    client.on("evenOdd", checkEvenOdd);
};

function onClientPing(data) {
    events++;
    this.emit('pong', { // Send a reply to the ping; include some server data.
        message: 'This message came from Node.js',
        uptime: process.uptime(),
        players: Object.keys(socket.connected),
        connected: Object.keys(socket.connected).length,
        numEvents:events});
    util.log("Ping!" );
    if(data) util.log(data);
}

function onClientDisconnect(client) {
    events++;
    players.splice(players.indexOf(client.id),1);
    util.log("Player has disconnected: "+this.id);
};

function onPart(data){
    events++;
    this.disconnect();
    util.log("Goodbye!");
    if(data) util.log(data);
}

function onClientDisconnect() {
    events++;
    util.log("Player has disconnected: "+this.id);
};

function onMessage(msg, next) {
    events++;
    if (next) next(msg+"?!?");
};

function checkEvenOdd(input, ack) {
    events++;
    if(isNaN(input)){
        ack('Not a number.');
    } else if (+input % 2 === 0) {
        ack('even');
    } else {
        ack('odd');
    }
};

init();