app.js

var express = require("express");
var app = express();
var http = require("http").Server(app);
var raven = require("raven");
var io = require("socket.io")(http);
var redis = require("redis");
var env = process.env.NODE_ENV || "development";
var url = require("url");

var redisClient = null;

// Configuration
if (env === "production") {

    // Sentry
    app.use(raven.middleware.express(process.env.RAVEN_DNS));

    // Redis
    var redisConf = url.parse(process.env.REDISCLOUD_URL),
        redisAuth = (redisConf.auth || '').split(':'),
        redisPass = redisAuth[1];

    redisClient = redis.createClient(redisConf.port, redisConf.hostname, {
        no_ready_check: true,
        auth_pass: redisPass,
    });
    redisClient.auth(redisPass);

} else if (env === "development") {

    // Redis
    redisClient = redis.createClient(6379, '127.0.0.1');

} else {

    // Raise an error
    console.error("Unknown env '" + env + "'");
}

// Ensure cross domain request support
app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    next();
});

// Redis pub/sub
redisClient.psubscribe("notification *");
redisClient.on("pmessage", function(pattern, channel, message) {
    // broadcast the notification
    if (channel === "notification signatures") {
        io.emit("signatures", message);
    } else {
        console.error("unknown type of notification");
    }
});

// Do you copy ?
app.get("/", function(req, res){
    res.send("<h1>5 sur 5 Tango Charlie</h1>");
});

// Socket io
io.on("connection", function(socket){
    // silence is golden
});

// Run the server
var port = process.env.PORT || 3000;
http.listen(port, function(){
    console.log("listening on *:" + port);
});