如何向特定用户发送消息Ratchet PHP Websocket

我正在尝试构建一个系统,用户可以在创建与websocket服务器的连接时订阅类别,然后他将开始接收该类别的更新.到目前为止,我已经与Ratchet合作,我能够向所有连接的客户端发送消息,但问题是我不想向所有客户端发送消息我只想将消息发送给订阅了该客户端的客户端.发送消息的特定类别.

PHP 代码

Chat.php

<?php
namespace MyApp;
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

class Chat implements MessageComponentInterface
{
    protected $clients;

    public function __construct()
    {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn)
    {
        $this->clients->attach($conn);
    }

    public function onMessage(ConnectionInterface $conn, $msg)
    {
        foreach ($this->clients as $client)
        {
            if($conn !== $client)
                $client->send($msg);
        }
    }

    public function onClose(ConnectionInterface $conn)
    {
        $this->clients->detach($conn);
    }

    public function onError(ConnectionInterface $conn, \Exception $e)
    {
        echo "An error has occurred: {$e->getMessage()}\n";
        $conn->close();
    }
}
?>

server.php

<?php
use Ratchet\Server\IoServer;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;
use MyApp\Chat;

require dirname(__DIR__) . '/Ratchet/vendor/autoload.php';

$server = IoServer::factory(
  new HttpServer(
    new WsServer(
      new Chat()
    )
  ),
  8080
);

$server->run();
?>

客户端js代码

<script type="text/javascript">
var conn = new WebSocket('ws://localhost:8080');

conn.onopen = function(e) {
  console.log("Connection established!");
};

conn.onmessage = function(e) {
  console.log(e.data);
};
</script>

基本上你需要一个语法来发送数据到WebSocket,我建议使用JSON对象来做到这一点.在您的WebSocket类中,您需要一个名为subscriptions的局部变量和一个名为users的局部变量.

<?php
namespace MyApp;
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

class Chat implements MessageComponentInterface
{
    protected $clients;
    private $subscriptions;
    private $users;

    public function __construct()
    {
        $this->clients = new \SplObjectStorage;
        $this->subscriptions = [];
        $this->users = [];
    }

    public function onOpen(ConnectionInterface $conn)
    {
        $this->clients->attach($conn);
        $this->users[$conn->resourceId] = $conn;
    }

    public function onMessage(ConnectionInterface $conn, $msg)
    {
        $data = json_decode($msg);
        switch ($data->command) {
            case "subscribe":
                $this->subscriptions[$conn->resourceId] = $data->channel;
                break;
            case "message":
                if (isset($this->subscriptions[$conn->resourceId])) {
                    $target = $this->subscriptions[$conn->resourceId];
                    foreach ($this->subscriptions as $id=>$channel) {
                        if ($channel == $target && $id != $conn->resourceId) {
                            $this->users[$id]->send($data->message);
                        }
                    }
                }
        }
    }

    public function onClose(ConnectionInterface $conn)
    {
        $this->clients->detach($conn);
        unset($this->users[$conn->resourceId]);
        unset($this->subscriptions[$conn->resourceId]);
    }

    public function onError(ConnectionInterface $conn, \Exception $e)
    {
        echo "An error has occurred: {$e->getMessage()}\n";
        $conn->close();
    }
}
?>

与之相关的javascript看起来有点像这样

<script type="text/javascript">
var conn = new WebSocket('ws://localhost:8080');

conn.onopen = function(e) {
  console.log("Connection established!");
};

conn.onmessage = function(e) {
  console.log(e.data);
};

function subscribe(channel) {
    conn.send(JSON.stringify({command: "subscribe", channel: channel}));
}

function sendMessage(msg) {
    conn.send(JSON.stringify({command: "message", message: msg}));
}
</script>

注意:这段代码是未经测试的,我是根据我对Ratchet的经验编写的.祝好运 :)

翻译自:https://stackoverflow.com/questions/30953610/how-to-send-messages-to-particular-users-ratchet-php-websocket