first part of messaging refactor

src/messaging/delete.js

@@ -0,0 +1,27 @@
+'use strict';
+
+var async = require('async');
+var db = require('../database');
+
+module.exports = function(Messaging) {
+
+	Messaging.deleteMessage = function(mid, roomId, callback) {
+		async.waterfall([
+			function (next) {
+				Messaging.getUidsInRoom(roomId, 0, -1, next);
+			},
+			function (uids, next) {
+				if (!uids.length) {
+					return next();
+				}
+				var keys = uids.map(function(uid) {
+					return 'uid:' + uid + ':chat:room:' + roomId + 'mids';
+				});
+				db.sortedSetsRemove(keys, roomId, next);
+			},
+			function(next) {
+				db.delete('message:' + mid, next);
+			}
+		], callback);
+	};
+};