Working gateway

Change-Id: I8ca690fe9d1b7f8e20b438df1ddd48d6b2f99326
diff --git a/src/controllers/redis.js b/src/controllers/redis.js
new file mode 100644
index 0000000..0277cab
--- /dev/null
+++ b/src/controllers/redis.js
@@ -0,0 +1,57 @@
+(function () {
+  'use strict';
+  
+  const socketIo = require('./websocket.js');
+  const config = require('../config/config.js').redis;
+  const logger = require('../config/logger.js');
+  const socket = socketIo.get();
+
+  var redis = require('redis');
+  var client = redis.createClient({
+    host: config.host,
+    port: config.port
+  });
+
+  client.on('error', function (err) {
+    logger.log('error', err);
+  });
+
+  client.on('ready', function () {
+    logger.log('info', 'Redis connected');
+  });
+
+  client.on('subscribe', function (channel) {
+    logger.log('debug', `Subscribed to channel: ${channel}`);
+  });
+
+  client.on('message', function (channel, message) {
+    logger.log('debug', 'sub channel ' + channel + ': ' + message);
+
+    let msg;
+    try {
+      msg = JSON.parse(message);
+      // TODO find the user that needs to be notified for msg.object update
+      socket.emit('event', {model: channel, msg: msg});
+    }
+    catch(e) {
+      // send the event also if it is not JSON
+      msg = message;
+      socket.emit('event', {model: channel, msg: msg});
+    }
+
+  });
+
+  const watchedCollections = [
+    'Instance',
+    'Node',
+    'Service',
+    'Slice',
+    'Site',
+    'Subscriber',
+    'Tenant'
+  ];
+
+  watchedCollections.forEach(c => {
+    client.subscribe(c);
+  });
+})();
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