multi node setup tryout

dispatch_daemon/index.js

-'use strict';
-
 const mqtt = require('mqtt')
 const constants = require(".././constants.json")
 console.log(constants.mqtt_url);
@@ -9,7 +7,7 @@ const libSupport = require('./lib')
 const execute = require('./execute')
 const fs = require('fs')
 
-const node_id = "20sez54hq8"
+const node_id = libSupport.makeid(10)
 const local_repository = __dirname + "/local_repository/"
 const host_url = "http://" + constants.master_address + ":" + constants.master_port
 client.on('connect', function () {
@@ -22,10 +20,9 @@ client.on('connect', function () {
 })
 
 client.on('message', function (topic, message) {
-    // message is Buffer
     
     message = JSON.parse(message)
-    if (message.type !== 'heartbeat') {
+    if (topic !== 'heartbeat') {
         let runtime = message.runtime
         let functionHash = message.functionHash
         let function_id = message.function_id
@@ -102,7 +99,7 @@ client.on('message', function (topic, message) {
 })
 
 function heartbeat() {
-    client.publish(node_id, JSON.stringify({"type": "heartbeat"}))
+    client.publish("heartbeat", JSON.stringify({"address": node_id}))
 }
 
-setInterval(heartbeat, 10000);
+setInterval(heartbeat, 1000);
\ No newline at end of file

dispatch_daemon/lib.js

@@ -19,4 +19,16 @@ var download = function (url, dest, cb) {
     
 };
 
-module.exports.download = download
+function makeid(length) {
\ No newline at end of file
+    var result = '';
+    var characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
+    var charactersLength = characters.length;
+    for (var i = 0; i < length; i++) {
+        result += characters.charAt(Math.floor(Math.random() * charactersLength));
+    }
+    return result;
+}
+
+
+module.exports.download = download
+module.exports.makeid = makeid;
\ No newline at end of file

dispatcher/index.js

@@ -22,8 +22,8 @@ app.use('/repository', express.static(file_path));
 app.use(fileUpload())
 
 let requestQueue = []
+let workerNodes = []
 
-const node_id = "20sez54hq8"
 const WINDOW_SIZE = 10
 const port = 8080
 const registry_url = constants.registry_url
@@ -141,7 +141,7 @@ function dispatch() {
         let functionHash = req.params.id
         let function_id = libSupport.makeid(20)
         console.log("Dispatching function with Id", function_id);
-        
+        let node_id = getAddress()
         client.publish(node_id, JSON.stringify({
             "type": "execute",
             function_id,
@@ -152,6 +152,10 @@ function dispatch() {
     }
 }
 
+function getAddress() {
+    return items[Math.floor(Math.random() * items.length)];
+}
+
 
 client.on('message', function (topic, message) {
 
@@ -164,6 +168,12 @@ client.on('message', function (topic, message) {
             "reply": message.result
         })
         db.delete(message.function_id)
+    } else if (topic === "heartbeat") {
+        message = JSON.parse(message)
+        if (workerNodes.indexOf(newItem) === -1) 
+            workerNodes.push(newItem)
+        console.log(workerNodes);
+        
     }
 })
 
@@ -171,6 +181,7 @@ app.listen(port, () => console.log(`Server listening on port ${port}!`))
 
 client.on('connect', function () {
     client.subscribe("response")
+    client.subscribe("heartbeat")
 })
 
 setInterval(dispatch, 1000);
\ No newline at end of file