services concept for node servers

gistfile1.js

var Service = require('services');
var express = require('express');
var log = require('clog');
var mongodb = require('mongodb');
var amqp = require('amqp');


logService = function(settings, services, cb) {
    if(settings.debug) {
        log.configure({'log level' : 5});
    } else {
        log.configure({'log level' : 1});
    }
    services.log = log;
    cb(true);
};


mongoService = function(settings, services, cb) {
    var mongo = new mongodb.Db(settings.mongo.db, dbServer, {});
    mongo.open(function(err, mongo) {
        if(err) {
            services.log.error("Could not connect to mongo.");
            services.log.error(err);
            cb(false);
        } else {
            services.mongo = mongo;
            cb(true);
        }
    });   

};

rabbitService = function(settings, services, cb) {
    var mq = amqp.createConnection({ host: settings.rabbit.ip });
    mq.on('ready', function() {
        services.mq = mq;
        cb(true);
    });

    //pass on a closed signal and reconnect
    mq.on('closed', function() { 
        services.emit('mq:closed');
        //do stuff
    });
};

myWebService = function(settings, services, cb) {
    services.app = express.createServer();
    //app logic here!
    services.on('mq:closed', function() {
        //perhaps our app cares about mq being closed?
    });
    services.app.listen(settings.port);
};

var services = Services();

//services are registered in dependancy order
services.addService(logService); 
services.addService(mongoService);
services.addService(rabbitService);
services.addService(myWebService);

services.start(settings, function(res) { /* handle errors */ });