closed #2179

app.js

@@ -168,6 +168,11 @@ function start() {
 								meta.js.map = message.map;
 								winston.info('[cluster] Client-side javascript and mapping propagated to worker ' + cluster.worker.id);
 							break;
+							case 'css-propagate':
+								meta.css.cache = message.cache;
+								meta.css.acpCache = message.acpCache;
+								winston.info('[cluster] Stylesheet propagated to worker ' + cluster.worker.id);
+							break;
 						}
 					});
 					

loader.js

@@ -14,6 +14,10 @@ var	nconf = require('nconf'),
 		js: {
 			cache: undefined,
 			map: undefined
+		},
+		css: {
+			cache: undefined,
+			acpCache: undefined
 		}
 	};
 
@@ -36,6 +40,14 @@ Loader.init = function() {
 							});
 						}
 
+						if (Loader.css.cache) {
+							worker.send({
+								action: 'css-propagate',
+								cache: Loader.css.cache,
+								acpCache: Loader.css.acpCache
+							});
+						}
+
 						worker.send('bind');
 
 						// Kill an instance in the shutdown queue
@@ -69,6 +81,21 @@ Loader.init = function() {
 							});
 						});
 					break;
+					case 'css-propagate':
+						Loader.css.cache = message.cache;
+						Loader.css.acpCache = message.acpCache;
+
+						var otherWorkers = Object.keys(cluster.workers).filter(function(worker_id) {
+								return parseInt(worker_id, 10) !== parseInt(worker.id, 10);
+							});
+						otherWorkers.forEach(function(worker_id) {
+							cluster.workers[worker_id].send({
+								action: 'css-propagate',
+								cache: message.cache,
+								acpCache: message.acpCache
+							});
+						});
+					break;
 					case 'listening':
 						if (message.primary) {
 							Loader.primaryWorker = parseInt(worker.id, 10);

src/meta/css.js

@@ -24,6 +24,7 @@ module.exports = function(Meta) {
 	Meta.css.defaultBranding = {};
 
 	Meta.css.minify = function(callback) {
+		if (!cluster.isWorker || process.env.cluster_setup === 'true') {
 			winston.info('[meta/css] Minifying LESS/CSS');
 			db.getObjectFields('config', ['theme:type', 'theme:id'], function(err, themeData) {
 				var themeId = (themeData['theme:id'] || 'nodebb-theme-vanilla'),
@@ -63,8 +64,26 @@ module.exports = function(Meta) {
 					function(next) {
 						minify(acpSource, paths, 'acpCache', next);
 					}
-			], callback);
+				], function(err, minified) {
+					// Propagate to other workers
+					if (cluster.isWorker) {
+						process.send({
+							action: 'css-propagate',
+							cache: minified[0],
+							acpCache: minified[1]
+						});
+					}
+
+					if (typeof callback === 'function') {
+						callback();
+					}
 				});
+			});
+		} else {
+			if (typeof callback === 'function') {
+				callback();
+			}
+		}
 	};
 
 	Meta.css.commitToFile = function(filename) {
@@ -123,7 +142,7 @@ module.exports = function(Meta) {
 			}
 
 			if (typeof callback === 'function') {
-				callback();
+				callback(null, css);
 			}
 		});
 	}