turns into a demon

bin/node-awslab-http-daemon

@@ -0,0 +1,79 @@
+#!/usr/bin/env node
+
+/**
+ * bin/node-awslab-http-daemon
+ */
+
+ require('daemon')();
+
+ var cluster = require('cluster');
+
+// Number of CPUs
+var numCPUs = require('os').cpus().length;
+
+/**
+ * Creates a new worker when running as cluster master.
+ * Runs the HTTP server otherwise.
+ */
+function createWorker() {
+  if (cluster.isMaster) {
+    // Fork a worker if running as cluster master
+    var child = cluster.fork();
+
+    // Respawn the child process after exit
+    // (ex. in case of an uncaught exception)
+    child.on('exit', function (code, signal) {
+      createWorker();
+    });
+  } else {
+    // Run the HTTP server if running as worker
+    require('../lib/app');
+  }
+}
+
+/**
+ * Creates the specified number of workers.
+ * @param  {Number} n Number of workers to create.
+ */
+function createWorkers(n) {
+  while (n-- > 0) {
+    createWorker();
+  }
+}
+
+/**
+ * Kills all workers with the given signal.
+ * Also removes all event listeners from workers before sending the signal
+ * to prevent respawning.
+ * @param  {Number} signal
+ */
+function killAllWorkers(signal) {
+  var uniqueID,
+      worker;
+
+  for (uniqueID in cluster.workers) {
+    if (cluster.workers.hasOwnProperty(uniqueID)) {
+      worker = cluster.workers[uniqueID];
+      worker.removeAllListeners();
+      worker.process.kill(signal);
+    }
+  }
+}
+
+/**
+ * Restarts the workers.
+ */
+process.on('SIGHUP', function () {
+  killAllWorkers('SIGTERM');
+  createWorkers(numCPUs * 2);
+});
+
+/**
+ * Gracefully Shuts down the workers.
+ */
+process.on('SIGTERM', function () {
+  killAllWorkers('SIGTERM');
+});
+
+// Create two children for each CPU
+createWorkers(numCPUs * 2);

lib/app.js

@@ -0,0 +1,23 @@
+var lab1_1 = require("./lab1_1").lab
+var example_1 = require("./example_1").lab;
+
+var PORT = 8080;
+
+
+var urlMap = [
+	{path: "/", action:__dirname + "/index.html"},	 
+	{path: "/digest", action: lab1_1},	
+	{path: "/example_1", action: example_1}, 
+	];
+
+var service = require("./service").http(urlMap);
+
+service(PORT);
+
+process.on('SIGTERM', function () {
+  if (server === undefined) return;
+  server.close(function () {
+    // Disconnect from cluster master
+    process.disconnect && process.disconnect();
+  });
+});

package.json

@@ -1,6 +1,9 @@
 {
   "name": "aws_lab",
   "version": "0.0.1",
+  "scripts": {    
+    "start": "node app.js"
+  },
   "dependencies": {
     "express": "~3.4.8",
     "aws-sdk": "~2.0.0-rc9"