[api] Add support for Redis auth and optional callbacks.

lib/nconf/stores/redis.js

@@ -31,6 +31,10 @@ var Redis = exports.Redis = function (options) {
   this.ttl       = options.ttl  || 60 * 60 * 1000;
   this.cache     = new Memory();
   this.redis     = redis.createClient(options.port, options.host);
+
+  if (options.auth) {
+    this.redis.auth(options.auth);
+  }
 };
 
 //
@@ -46,6 +50,9 @@ Redis.prototype.get = function (key, callback) {
       mtime   = this.cache.mtimes[key],
       fullKey = nconf.key(this.namespace, key);
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   //
   // If the key exists in the cache and the ttl is less than 
   // the value set for this instance, return from the cache.
@@ -117,6 +124,9 @@ Redis.prototype.set = function (key, value, callback) {
   var self = this,
       path = nconf.path(key);
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   function addKey (partial, next) {
     var index  = path.indexOf(partial),
         base   = [self.namespace].concat(path.slice(0, index)),
@@ -171,6 +181,9 @@ Redis.prototype.clear = function (key, callback) {
       last    = path.pop(),
       fullKey = nconf.key(this.namespace, key);
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   // 
   // Clear the key from the cache for this instance
   //
@@ -226,6 +239,9 @@ Redis.prototype.save = function (value, callback) {
   var self = this,
       keys = Object.keys(value);
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   //
   // Clear all existing keys associated with this instance.
   //
@@ -252,6 +268,9 @@ Redis.prototype.load = function (callback) {
   var self   = this,
       result = {};
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   this.redis.smembers(nconf.key(this.namespace, 'keys'), function (err, keys) {
     if (err) {
       return callback(err);
@@ -282,6 +301,9 @@ Redis.prototype.load = function (callback) {
 Redis.prototype.reset = function (callback) {
   var self = this;
 
+  // Set the callback if not provided for "fire and forget"
+  callback = callback || function () { };
+
   //
   // Get the list of of top-level keys, then clear each of them
   //