sync config changes over redis pubsub

src/pubsub.js

@@ -0,0 +1,45 @@
+
+'use strict';
+
+var nconf = require('nconf'),
+	util = require('util'),
+	winston = require('winston'),
+	EventEmitter = require('events').EventEmitter;
+
+var PubSub = function() {
+	var self = this;
+	if (nconf.get('redis')) {
+		var redis = require('./database/redis');
+		var subClient = redis.connect();
+		this.pubClient = redis.connect();
+
+		subClient.subscribe('pubsub_channel');
+
+		subClient.on('message', function(channel, message) {
+			if (channel !== 'pubsub_channel') {
+				return;
+			}
+
+			try {
+				var msg = JSON.parse(message);
+				self.emit(msg.event, msg.data);
+			} catch(err) {
+				winston.error(err.stack);
+			}
+		});
+	}
+};
+
+util.inherits(PubSub, EventEmitter);
+
+PubSub.prototype.publish = function(event, data) {
+	if (this.pubClient) {
+		this.pubClient.publish('pubsub_channel', JSON.stringify({event: event, data: data}));
+	} else {
+		this.emit(event, data);
+	}
+};
+
+var pubsub = new PubSub();
+
+module.exports = pubsub;