Added memcached support

README.md

@@ -82,9 +82,9 @@ Where `path` represents where you want the files stored
 
 ### Redis
 
-To use redis storage you must install the redis package in npm globall using
+To use redis storage you must install the redis package in npm
 
-`npm install redis --global`
+`npm install redis`
 
 Once you've done that, your config section should look like:
 
@@ -101,6 +101,27 @@ You can also set an `expire` option to the number of seconds to expire keys in.
 
 All of which are optional except `type` with very logical default values.
 
+### Memcached
+
+To use memcached storage you must install the `memcache` package via npm
+
+`npm install memcache`
+
+Once you've done that, your config section should look like:
+
+``` json
+{
+	"type": "memcached",
+	"host": "127.0.0.1",
+	"port": 11211
+}
+```
+
+You can also set an `expire` option to the number of seconds to expire keys in.  This behaves just like the redis expirations, but does not push expirations forward on GETs.
+
+All of which are optional except `type` with very logical default values.
+
+
 ## Author
 
 John Crepezzi <john.crepezzi@gmail.com>

lib/memcached_document_store.js

@@ -0,0 +1,44 @@
+var memcached = require('memcache');
+var winston = require('winston');
+
+// Create a new store with options
+var MemcachedDocumentStore = function(options) {
+  this.expire = options.expire;
+  if (!MemcachedDocumentStore.client) {
+    MemcachedDocumentStore.connect(options);
+  }
+};
+
+// Create a connection
+MemcachedDocumentStore.connect = function(options) {
+  var host = options.host || '127.0.0.1';
+  var port = options.port || 11211;
+  this.client = new memcached.Client(port, host);
+  this.client.connect();
+  this.client.on('connect', function() {
+    winston.info('connected to memcached on ' + host + ':' + port);
+  });
+  this.client.on('error', function(e) {
+    winston.info('error connecting to memcached', { error: e });
+  });
+};
+
+// Save file in a key
+MemcachedDocumentStore.prototype.set = function(key, data, callback, skipExpire) {
+  MemcachedDocumentStore.client.set(key, data, function(err, reply) {
+    err ? callback(false) : callback(true);
+  }, skipExpire ? 0 : this.expire);
+};
+
+// Get a file from a key
+MemcachedDocumentStore.prototype.get = function(key, callback, skipExpire) {
+  var _this = this;
+  MemcachedDocumentStore.client.get(key, function(err, reply) {
+    callback(err ? false : reply);
+    if (_this.expire && !skipExpire) {
+      winston.warn('memcache store does not currently push forward expirations on GET');
+    }
+  });
+};
+
+module.exports = MemcachedDocumentStore;