Config that Node for different environments

server.js

var express     = require('express'),
    http        = require('http'),
    redis       = require('redis'),
    argv        = require('optimist').default('env', 'default').options('c', { 'alias' : 'config'
                                                   , 'default' : './default_config.json'
                                                   }).argv
  , config      = require(argv.config);

var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);

// Sanity Checks
if(!config.redis) { // you don't even have redis settings
  console.log("!!! ERROR: No redis settings found. Don't be a noob. !!!");
  return;
} else if(!config.redis['default']) { // you don't even have a default. YOU NOOB!
  console.log("!!! ERROR: You don't even have a redis.default hash. Who do you think you are?");
  return;
}

// Well at least you made it this far
if(argv.env !== 'default' && config.redis[argv.env]) { // set an env and you have it
  config.redis = config.redis[argv.env];
} else { // just use default
  if(argv.env !== 'default') {
      console.log("!!! WARNING: cannot find env `redis." + argv.env + "` in ./default_config.json, using `redis.default`");
  }
  config.redis = config.redis['default'];
}

// C-C-C-C-C-COMBO BREAKER, you done goof'd.
if(!config.redis.port || !config.redis.host) {
  console.log("!!! ERROR: No `port` of `host` keys found for the environment " + argv.env);
  return;
}


// CONFIG
var client    = redis.createClient(config.redis.port, config.redis.host, {})
  , listener  = redis.createClient(config.redis.port, config.redis.host, {});

// Password protected database? No problem.
if (config.redis.password) {
  client.auth(config.redis.password);
  listener.auth(config.redis.password);
}

// Different database on the same instance? We got you covered;
if(config.redis.database) {
  client.select(config.redis.database, function(){});
  listener.select(config.redis.database, function(){});
}

// Error Handling for Redis
client.on('error', function(err){
  console.trace('!!! ERROR: ' + err);
});

listener.on('error', function(err){
  console.trace('!!! ERROR: ' + err);
});

// Lets start the party!
server.listen(config.general.port);