MongoClient is pretty cool

[Raynos]

function mongo(collectionName, databaseName) {
    var cachedCollection
    var queue

    return getCollection

    function getCollection(callback) {
        if (cachedCollection) {
            return callback(null, cachedCollection)
        } else if (queue) {
            return queue.push(callback)
        }

        queue = [callback]

        console.log("uri", config)

        MongoClient.connect(config.DB_URL, {}, function (err, db) {
            if (err) {
                throw err
            }

            var col = db.collection(collectionName)

            queue.forEach(function (f) { f(null, col) })

            console.log("db.db?", db.db)
        })
    }
}