Added Redis store support

lib/redis_document_store.js

@@ -0,0 +1,38 @@
+var redis = require('redis');
+var winston = require('winston');
+var hashlib = require('hashlib');
+
+// TODO move to a different method (conn)
+var RedisDocumentStore = function(options) {
+  if (!RedisDocumentStore.client) {
+    var host = options.host || '127.0.0.1';
+    var port = options.port || 6379;
+    var index = options.db || 0;
+    RedisDocumentStore.client = redis.createClient(port, host);
+    RedisDocumentStore.client.select(index, function(err, reply) {
+      if (err) {
+        winston.error('error connecting to redis index ' + index, { error: error.message });
+        process.exit(1);
+      }
+      else {
+        winston.info('connected to redis on ' + host + ':' + port + '/' + index);
+      }
+    });
+  }
+};
+
+// Save file in a key
+RedisDocumentStore.prototype.set = function(key, data, callback) {
+  RedisDocumentStore.client.set(key, data, function(err, reply) {
+    callback(!err);
+  });
+};
+
+// Get a file from a key
+RedisDocumentStore.prototype.get = function(key, callback) {
+  RedisDocumentStore.client.get(key, function(err, reply) {
+    callback(err ? false : reply);
+  }); 
+};
+
+module.exports = RedisDocumentStore;