send less data when leaving rooms

public/src/ajaxify.js

@@ -46,7 +46,7 @@ $(document).ready(function() {
 			return true;
 		}
 
-		app.enterRoom('');
+		app.leaveCurrentRoom();
 
 		$(window).off('scroll');
 

public/src/app.js

@@ -143,14 +143,25 @@ app.cacheBuster = null;
 				status: app.user.status
 			}, function(err) {
 				if (err) {
-					app.alertError(err.message);
-					return;
+					return app.alertError(err.message);
 				}
 				app.currentRoom = room;
 			});
 		}
 	};
 
+	app.leaveCurrentRoom = function() {
+		if (!socket) {
+			return;
+		}
+		socket.emit('meta.rooms.leaveCurrent', function(err) {
+			if (err) {
+				return app.alertError(err.message);
+			}
+			app.currentRoom = '';
+		});
+	}
+
 	function highlightNavigationLink() {
 		var path = window.location.pathname;
 		$('#main-nav li').removeClass('active');

src/socket.io/meta.js

@@ -1,16 +1,10 @@
 'use strict';
 
-var	nconf = require('nconf'),
-	gravatar = require('gravatar'),
-	winston = require('winston'),
-	validator = require('validator'),
+var	validator = require('validator'),
 
-	db = require('../database'),
 	meta = require('../meta'),
 	user = require('../user'),
 	topics = require('../topics'),
-	logger = require('../logger'),
-	plugins = require('../plugins'),
 	emitter = require('../emitter'),
 	rooms = require('./rooms'),
 
@@ -53,13 +47,7 @@ SocketMeta.rooms.enter = function(socket, data, callback) {
 		return callback(new Error('[[error:not-allowed]]'));
 	}
 
-	if (socket.currentRoom) {
-		rooms.leave(socket, socket.currentRoom);
-		if (socket.currentRoom.indexOf('topic') !== -1) {
-			websockets.in(socket.currentRoom).emit('event:user_leave', socket.uid);
-		}
-		socket.currentRoom = '';
-	}
+	leaveCurrentRoom(socket);
 
 	if (data.enter) {
 		rooms.enter(socket, data.enter);
@@ -76,6 +64,24 @@ SocketMeta.rooms.enter = function(socket, data, callback) {
 	callback();
 };
 
+SocketMeta.rooms.leaveCurrent = function(socket, data, callback) {
+	if (!socket.uid || !socket.currentRoom) {
+		return callback();
+	}
+	leaveCurrentRoom(socket);
+	callback();
+};
+
+function leaveCurrentRoom(socket) {
+	if (socket.currentRoom) {
+		rooms.leave(socket, socket.currentRoom);
+		if (socket.currentRoom.indexOf('topic') !== -1) {
+			websockets.in(socket.currentRoom).emit('event:user_leave', socket.uid);
+		}
+		socket.currentRoom = '';
+	}
+}
+
 SocketMeta.rooms.getAll = function(socket, data, callback) {
 	var roomClients = rooms.roomClients();
 	var socketData = {