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上一篇我用ratchet实现了多个浏览器间相互通讯,但是这还远远不够,有几个问题:
1、我总不能让用户在console里面聊天;
2、用户输入的内容我在脚本拿不到,无法保存在数据库
3、不应该推送用户没有订阅的内容
上面的问题是我想到的,下面的步骤是我按官网的步骤来的,官网有的地方是不正确的,因为我整整实验了两天才做出来,成功的那一刻我差点流出泪,整个官网都是外文,任何一门技术都要有耐心的琢磨。记录下来,自豪的。
先说一个下整个工作的原理:
①客户端1向服务器发送请求,加载页面,这时客户端向服务器建立一个开发的websocket连接
②客户端2通过ajax或者form表单向服务器发送内容(这时候websocket是始终连接着的)
③服务器接收客户端2post的数据后,进行一些列的入库等操作,再将数据压如ZeroMQ栈中。这里出现的新名词ZeroMQ有必要去详细了解一下。
④websocket栈会得到来自ZeroMQ的句柄,然后再发送给连接着它的各个客户端,客户端接收数据通过js改版页面
下面的流程是需要准备的工作:
ZeroMQ:
安装ZeroMQ连接:官方下载,安装完成后还要是自己的PHP支持ZMQ的扩展,下载连接:PECL下扩展。安装后你的PHPinfo()中应该有如下:
React/ZMQ:
Ratchet本身就是建立在React上的项目,我们需要通过composer加载另一个项目React/ZMQ,这个项目绑定ZeroMQ和Reactor core,以便我们可以控制webSocket和ZeroMQ socket。要加载这个,你需要编辑composer.json并运行:
1 { 2 "autoload": { 3 "psr-0": { 4 "MyApp": "src" 5 } 6 }, 7 "require": { 8 "cboden/ratchet": "0.3.*", 9 "react/zmq": "0.2.*|0.3.*" 10 } 11 }
代码之旅:
现在需要的环境已经完备,接下来就是编辑代码的工作了。如果你的chat-server还运行的话,应该把它关掉。没有运行就不用管他了。看代码:
1 php 2 namespace MyApp; 3 use Ratchet\ConnectionInterface; 4 use Ratchet\Wamp\WampServerInterface; 5 6 class Pusher implements WampServerInterface { 7 public function onSubscribe(ConnectionInterface $conn, $topic) { 8 } 9 public function onUnSubscribe(ConnectionInterface $conn, $topic) { 10 } 11 public function onOpen(ConnectionInterface $conn) { 12 } 13 public function onClose(ConnectionInterface $conn) { 14 } 15 public function onCall(ConnectionInterface $conn, $id, $topic, array $params) { 16 // In this application if clients send data it's because the user hacked around in console 17 $conn->callError($id, $topic, 'You are not allowed to make calls')->close(); 18 } 19 public function onPublish(ConnectionInterface $conn, $topic, $event, array $exclude, array $eligible) { 20 // In this application if clients send data it's because the user hacked around in console 21 $conn->close(); 22 } 23 public function onError(ConnectionInterface $conn, \Exception $e) { 24 } 25 }
代码保存为/src/MyApp/Pusher.php 这里面的方法都是接口里的方法,必须重写的。待会还要根据情况进行修改。
编辑接受sub信息的脚本(getSub.php):
从客户端接受post后,可以插入数据库,然后会打开一个ZeroMQ socket connection并且发送数据,这里会出现ZMQContext类,是php的系统类,你有必要了解一下
ZMQ这个php扩展
1 php 2 // post.php ??? 3 // This all was here before ;) 4 $entryData = array( 5 'category' => $_POST['category'] 6 , 'title' => $_POST['title'] 7 , 'article' => $_POST['article'] 8 , 'when' => time() 9 ); 10 11 $pdo->prepare("INSERT INTO blogs (title, article, category, published) VALUES (?, ?, ?, ?)") 12 ->execute($entryData['title'], $entryData['article'], $entryData['category'], $entryData['when']); 13 14 // This is our new stuff 15 $context = new ZMQContext(); 16 $socket = $context->getSocket(ZMQ::SOCKET_PUSH, 'my pusher'); 17 $socket->connect("tcp://localhost:5555"); 18 19 $socket->send(json_encode($entryData));
控制ZeroMQ messages 句柄:
这里就是重写上面的pusher类中的方法,这里官方是有些错误的,因为按照官方实验是行不通的,所以自己修改了一下可以了:
1 php 2 namespace MyApp; 3 use Ratchet\ConnectionInterface; 4 use Ratchet\Wamp\WampServerInterface; 5 6 class Pusher implements WampServerInterface { 7 /** 8 * A lookup of all the topics clients have subscribed to 9 */ 10 protected $subscribedTopics = array();//根据实际情况添加,如果不添加会直接return 11 12 public function onSubscribe(ConnectionInterface $conn, $topic) { 13 $this->subscribedTopics[$topic->getId()] = $topic; 14 } 15 16 /** 17 * @param string JSON'ified string we'll receive from ZeroMQ 18 */ 19 public function onBlogEntry($entry) { 20 $entryData = json_decode($entry, true); 21 22 // If the lookup topic object isn't set there is no one to publish to 23 if (!array_key_exists($entryData['category'], $this->subscribedTopics)) { 24 return; 25 } 26 27 $topic = $this->subscribedTopics["题目"];//题目要与js中相对应 28 29 // re-send the data to all the clients subscribed to that category 30 $topic->broadcast($entryData); 31 } 32 33 /* The rest of our methods were as they were, omitted from docs to save space */ 34 }
创建执行脚本,(loop脚本):
1 php 2 require dirname(__DIR__) . '/vendor/autoload.php'; 3 4 $loop = React\EventLoop\Factory::create(); 5 $pusher = new MyApp\Pusher; 6 7 // Listen for the web server to make a ZeroMQ push after an ajax request 8 $context = new React\ZMQ\Context($loop); 9 $pull = $context->getSocket(ZMQ::SOCKET_PULL); 10 $pull->bind('tcp://127.0.0.1:5555'); // Binding to 127.0.0.1 means the only client that can connect is itself 11 $pull->on('message', array($pusher, 'onBlogEntry')); 12 13 // Set up our WebSocket server for clients wanting real-time updates 14 $webSock = new React\Socket\Server($loop); 15 $webSock->listen(8080, '0.0.0.0'); // Binding to 0.0.0.0 means remotes can connect 16 $webServer = new Ratchet\Server\IoServer( 17 new Ratchet\Http\HttpServer( 18 new Ratchet\WebSocket\WsServer( 19 new Ratchet\Wamp\WampServer( 20 $pusher 21 ) 22 ) 23 ), 24 $webSock 25 ); 26 27 $loop->run();
保存为/bin/push-server.php,并且运行
客户端需要加载的js代码:
只需要嵌入到一个空的html页面中就行,代开一个浏览器加载这个页面,然后运行getSub.php,当然post数据你模拟一下即可,看看第一个浏览器发生了什么?
如果成功了,那么恭喜你,如果没有成功,请看官网的教程:http://socketo.me/docs/push。下一步我的工作就是在linux上实验一遍