我正在尝试构建一个系统,用户可以在建立与 websocket 服务器的连接时订阅某个类别,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消息的客户端发送消息的特定类别。
PHP Code
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();
}
}
?>
服务器.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,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,您需要一个名为的局部变量subscriptions
和一个名为的局部变量users
像这样。
<?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();
}
}
?>
与之配套的 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:此代码未经测试,是我根据 Ratchet 的经验即时编写的。祝你好运 :)
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