zero downtime and reload support with cluster module

src/meta.js

@@ -40,7 +40,7 @@ var async = require('async'),
 					emitter.emit('nodebb:ready');
 				}
 
-				callback.apply(null, arguments);
+				if (callback) callback.apply(null, arguments);
 			});
 		});
 	};

src/meta/templates.js

@@ -5,6 +5,7 @@ var mkdirp = require('mkdirp'),
 	path = require('path'),
 	fs = require('fs'),
 	nconf = require('nconf'),
+	cluster = require('cluster'),
 
 	emitter = require('../emitter'),
 	plugins = require('../plugins'),
@@ -13,6 +14,16 @@ var mkdirp = require('mkdirp'),
 	Templates = {};
 
 Templates.compile = function(callback) {
+	if (cluster.isWorker && process.env.cluster_setup !== 'true') {
+		return setTimeout(function() {
+			console.log('FAKING TEMPLATE COMPILE');
+			emitter.emit('templates:compiled');
+			if (callback) callback();
+		}, 1000);
+	} else {
+		console.log('REAL TEMPLATE COMPILE');
+	}
+
 	var baseTemplatesPath = nconf.get('base_templates_path'),
 		viewsPath = nconf.get('views_dir'),
 		themeTemplatesPath = nconf.get('theme_templates_path');

src/middleware/index.js

@@ -128,14 +128,7 @@ module.exports = function(app, data) {
 
 	routeCurrentTheme(app, data.currentThemeId, data.themesData);
 	routeThemeScreenshots(app, data.themesData);
-
-	if (process.env.cluster_setup === 'true') {
-		meta.templates.compile();
-	} else {
-		setTimeout(function() {
-			emitter.emit('templates:compiled');
-		}, 1000);
-	}
+	meta.templates.compile();
 
 	return middleware;
 };

src/socket.io/admin.js

@@ -14,6 +14,7 @@ var	groups = require('../groups'),
 	async = require('async'),
 	winston = require('winston'),
 	index = require('./index'),
+	cluster = require('cluster'),
 
 	SocketAdmin = {
 		user: require('./admin/user'),
@@ -39,7 +40,13 @@ SocketAdmin.before = function(socket, method, next) {
 };
 
 SocketAdmin.reload = function(socket, data, callback) {
-	meta.reload(callback);
+	if (cluster.isWorker) {
+		process.send({
+			action: 'reload'
+		});
+	} else {
+		meta.reload(callback);
+	}
 };
 
 SocketAdmin.restart = function(socket, data, callback) {

src/webserver.js

@@ -41,7 +41,7 @@ if(nconf.get('ssl')) {
 	emailer.registerApp(app);
 	notifications.init();
 
-	if (process.env.cluster_setup === 'true') {
+	if (cluster.isWorker && process.env.cluster_setup === 'true') {
 		user.startJobs();
 	}
 
@@ -50,7 +50,7 @@ if(nconf.get('ssl')) {
 		meta.js.minify(app.enabled('minification'));
 		meta.css.minify();
 
-		if (process.env.cluster_setup === 'true') {
+		if (cluster.isWorker && process.env.cluster_setup === 'true') {
 			meta.sounds.init();
 		}
 	});