Raise WebSocket server

Many have already heard about the revolution in the expansion of the HTTP protocol - the introduction of WebSocket technology by Google Chromium developers. This article will discuss how to tame this beast - installing and configuring the WebSocket server on the asynchronous phpDaemon framework.

For installation, we need PHP5 CLI> = 5.3 with pcntl, shmop and sockets support.

1. Download

Get the latest version of phpDaemon from the repository

 $ svn checkout http://phpdaemon.googlecode.com/svn/trunk $path/ 

Note that the $ path must be replaced with the path where phpDaemon is installed

2. Installation

Set launch rights

$ chmod +x $path/bin/phpdaemon

Install the libevent library

$ pecl install libevent

We tie the demon to the phpd command

$ ln -s $path/bin/phpdaemon /usr/bin/phpd

')

3. Customization

Configure the $ path / conf / phpdaemon.conf.php file

Copy Source | Copy HTML

1. <? php
2. // Turn On Error Display
3. error_reporting (E_ALL);
4. ini_set ( 'display_errors' , '1' );
6. return array (
7. 'mod-websocketserver-enable' => 1 , // Turn on the web socket server
8. 'mod-websocketserver-listen' => 'tcp: //0.0.0.0' , // Listen to all IP
9. 'mod-websocketserver-listenport' => 8047 , // Hang to a different one from 80 so as not to conflict with other web servers
10. 'max-requests' => 1000 , // Maximum number of requests
11. 'max-idle' => 0 , // Maximum idle time
12. 'user' => 'www' , // User
13. 'group' => 'www' , // and the group under which the daemon runs
14. 'min-spare-workers' => 5 ,
15. 'max-spare-workers' => 20 ,
16. 'start-workers' => 1 ,
17. 'max-workers' => 50 ,
18. 'min-workers' => 1 ,
19. 'path' => dirname ( __FILE__ ). '/appResolver.php'
20. );
22. ?>

Create an example of a web socket request handler:

$ path / applications / WebSoketWorker.php

Copy Source | Copy HTML

1. <? php
2. return new WebSocketWorker;
3. / ** <br/> * WebSocket Handler <br/> * <br/> * /
4. class WebSocketWorker extends AppInstance {
5. / ** <br/> * WebSocket Server <br/> * @var WebSocketServer <br/> * /
6. public $ ws ;
7. / ** <br/> * Initialization handler <br/> * /
8. public function onReady () {
9. $ this -> ws = Daemon :: $ appResolver -> getInstanceByAppName ( 'WebSocketServer' );
10. if ( $ this -> ws) {
11. $ this -> ws-> routes [ 'myRoute' ] = array ( $ this , 'openSession' );
12. }
13. }
14. / ** <br/> * Opening a new session <br/> * @param $ client <br/> * /
15. public function openSession ( $ client ) {
16. return new WebSocketWorkerSession ( $ client );
17. }
19. }
20. / ** <br/> * Websocket Session <br/> * <br/> * /
21. class WebSocketWorkerSession {
22. public $ client ;
23. / ** <br/> * Initialization <br/> * @param $ client <br/> * /
24. public function __construct ( $ client ) {
25. Daemon :: log ( 'connected' );
26. $ this -> client = $ client ;
27. }
28. / ** <br/> * Receiving message <br/> * @param $ data - message body <br/> * @param $ type - message type <br/> * /
29. public function onFrame ( $ data , $ type ) {
30. Daemon :: log ( $ data );
31. if ( $ data === 'ping' ) {
32. $ this -> client-> sendFrame ( 'pong' );
33. }
34. }
35. / ** <br/> * Closing session <br/> * /
36. public function onFinish () {
38. }
39. }
40. ?>

Voila! Our website server is installed!

4. Testing

For testing, create a file with the following content:

Copy Source | Copy HTML

1. <script type = "text / javascript" >
2. <! -
3. if ( "WebSocket" in window) {
4. var ws = new WebSocket ( "ws: //127.0.0.1: 8047 / myRoute" );
5. ws.onopen = function () {
6. // Web Socket is connected. You can send data using the send () method.
7. ws.send ( "ping" );
8. };
9. // every time the browser gets some data through a web socket
10. ws.onmessage = function (evt) {
11. alert ( 'Received message:' + evt.data);
12. };
13. ws.onclose = function () {
14. // websocket closed.
15. };
16. } else {
17. // for browsers that do not support WebSocket.
18. alert ( 'Your browser does not support websockets' );
19. }
20. // ->
21. </ script>

In case of a successful connection, you should receive a “pong” message.

For support in non- Chrome browsers, use the web-socket-js library, which emulates web sockets using flash.