Chat Service - Send data to specific user

[youssef.e...@gmail.com]

im working on a PHP project based on Symfony 2.2.11 and I installed the socketo related to the following tutorial http://socketo.me/docs/install to make my chat script working.

ServerCommand.php // Code of the command line that starts the WebSocket server

$oLoop = Factory::create();

    // Listen for the web server to make a ZeroMQ push after an ajax request
    $oContext = new Context($oLoop);
    $oPull = $oContext->getSocket(\ZMQ::SOCKET_PULL);
    // LET IT 127.0.0.1
    $oPull->bind('tcp://127.0.0.1:5555'); // Binding to 127.0.0.1 means the only client that can connect is itself
    $oPull->on('message', array($oChat, 'onMessage'));

    // Set up our WebSocket server for clients wanting real-time updates
    $oWebSock = new Server($oLoop);
    $oWebSock->listen(7979, '0.0.0.0'); // Binding to 0.0.0.0 means remotes can connect
    $webServer = new IoServer(
        new HttpServer(
            new WsServer(
                new WampServer(
                    $oChat
                )
            )
        ),
        $oWebSock
    );

    $oLoop->run();

After a message is being added to database : MessagesController.php

....
// This is our new stuff
        $oContext = new \ZMQContext();
        $oSocket = $oContext->getSocket(\ZMQ::SOCKET_PUSH, 'PushMe');
        $oSocket->connect("tcp://mydomain:5555");

        $aData = array(
            'topic'         => 'message',
            'sUsername'     => $oUserCurrent->getUsername(),
            'sMessage'      => $sMessage
        );

        $oSocket->send(json_encode($aData));
.....

The chat service : Chat.php

/**
 * A lookup of all the topics clients have subscribed to
 */
public function onSubscribe(ConnectionInterface $conn, $topic) 
{
    // When a visitor subscribes to a topic link the Topic object in a  lookup array
    $subject = $topic->getId();
    $ip = $conn->remoteAddress;

    if (!array_key_exists($subject, $this->subscribedTopics)) 
    {
        $this->subscribedTopics[$subject] = $topic;
    }

    $this->clients[] = $conn->resourceId;

    echo sprintf("New Connection: %s" . PHP_EOL, $conn->remoteAddress);

}

/**
 * @param string JSON'ified string we'll receive from ZeroMQ
 */
public function onMessage($jData) 
{
    $aData = json_decode($jData, true);

    var_dump($aData);

    if (!array_key_exists($aData['topic'], $this->subscribedTopics)) {
        return;
    }

    $topic = $this->subscribedTopics[$aData['topic']];

    // This sends out everything to multiple users, not what I want!!

    // re-send the data to all the clients subscribed to that category
    $topic->broadcast($aData);
}

JS code that receives data : messages.html.twig :

var conn = new ab.Session(
                    'ws://mydomain:7979' // The host (our Ratchet WebSocket server) to connect to
                  , function() {            // Once the connection has been established
                        conn.subscribe('message', function(topic, data) 
                        {
                            console.log(topic);
                            console.log(data);
                        });
                    }
                  , function() {            // When the connection is closed
                        console.warn('WebSocket connection closed');
                    }
                  , {                       // Additional parameters, we're ignoring the WAMP sub-protocol for older browsers
                        'skipSubprotocolCheck': true
                    }
                );

So everytings working perfectly, when I send a new Message, it goes to DB then it lands on the page of the chat.

PROBLEM : The data lands wherever the JS script is, and the result is that all users can get the same recorded message

ASKING : How can I make data lands in a specific user by USERNAME or something else page ? So that not all users get the same message.

Thank you

[cboden]

In your example everyone subscripted to the topic called "message". Simply subscribe to a different topic name that is unique to as many people as you want to send the message to and publish to that topic.