如何向特定用户发送消息 Ratchet PHP Websocket [英] How to send messages to particular users Ratchet PHP Websocket

问题描述

我正在尝试构建一个系统，用户可以在其中订阅与 websocket 服务器建立连接的类别，然后他将开始接收该类别的更新.到目前为止，我一直在与 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发送消息的特定类别.

I'm trying to build a system where user can subscribe to a category on establishing connection to websocket server and then he will start receiving updates for that category. So far, I have worked with Ratchet and I am able to send message to all the connected clients but the problem is I don't want to send message to all the clients I just want to send the message to the clients who have subscribed the the particular category in which the messages was sent.

PHP 代码

聊天.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>

推荐答案

基本上，您需要一种将数据发送到 WebSocket 的语法，我建议使用 JSON 对象来执行此操作.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，就像这样.

Basically you want a syntax for sending data to the WebSocket, I reccomend using a JSON object to do this. In your WebSocket class you need a local variable called subscriptions and a local variable called users like so.

<?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();
    }
}
?>

要使用的 javascript 看起来有点像这样

The javascript to go with that looks a bit like this

<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:此代码未经测试，是我根据使用 Ratchet 的经验即时编写的.祝你好运:)

Note: This code is untested I wrote it on the fly from my experience with Ratchet. Good luck :)

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