minor bug fixes

dispatcher/index.js

@@ -153,7 +153,7 @@ function dispatch() {
 }
 
 function getAddress() {
-    return items[Math.floor(Math.random() * items.length)];
+    return workerNodes[Math.floor(Math.random() * workerNodes.length)];
 }
 
 
@@ -170,8 +170,8 @@ client.on('message', function (topic, message) {
         db.delete(message.function_id)
     } else if (topic === "heartbeat") {
         message = JSON.parse(message)
-        if (workerNodes.indexOf(newItem) === -1) 
-            workerNodes.push(newItem)
+        if (workerNodes.indexOf(message.address) === -1) 
+            workerNodes.push(message.address)
         console.log(workerNodes);
         
     }