Question

我在网上搜索了很多，但没有找到有用的线索。

我的本地计算机上有一个websocket服务器和一个Web服务器。

当客户端使用浏览器API＆＃39; new WebSocket（＆＃34; ws：// localhost＆＃34;）＆＃39;连接到它时，我需要将$ _SESSION数据传递给websocket服务器。（请求使用反向代理发送到websocket，反向代理在接收带有“升级”标头的请求时知道它。

重点是客户端成功连接到ws服务器，但我需要使用HTTP Web服务器设置的$ _SESSION变量恢复其SESSION数据。

实际上我的情况是这样的（我正在使用Ratchet库）：

use Ratchet\Server\IoServer;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;
use MyApp\MyAppClassChat;

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

$server = IoServer::factory(new HttpServer(new WsServer(new MyAppClass())), 8080);
$server->run();

MyAppClass非常简单：

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

class MyAppClass implements MessageComponentInterface {

    protected $clients;

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

    public function onOpen(ConnectionInterface $conn) {
            /* I would like to put recover the session infos of the clients here
               but the session_start() call returns an empty array ($_SESSION variables have been previuosly set by the web server)*/
        session_start();
        var_dump($_SESSION) // empty array...
        echo "New connection! ({$conn->resourceId})\n";
    }

    public function onMessage(ConnectionInterface $from, $msg) {
        $numberOfReceivers = count($this->clients) -1;
        echo sprintf('Connection %d sending message "%s" to %d other connection%s' . "\n", $from->resourceId, $msg, 
                                 $numberOfReceivers, $numberOfReceivers == 1 ? '' : 's');

        $this->clients->rewind();
        while ($this->clients->valid())
        {
            $client = $this->clients->current();
            if ($client !== $from) {
                $client->send($msg);
            }
            $this->clients->next();
        }
    }

    public function onClose(ConnectionInterface $conn) {
        $this->clients->detach($conn);
        echo "Connection {$conn->resourceId} has disconnected\n";
    }

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

有没有办法用我的实际布局做到这一点，或者我应该配置apache才能使用 mod_proxy_wstunnel模块？

感谢您的帮助!!!

Answer 1

当其他StackOverflow回答显示（Ratchet without Symfony session，Starting a session within a ratchet websocket connection）时，无法直接在Apache和Ratchet进程之间共享$ _SESSION变量。但是，可以启动与Apache服务器的会话，然后访问Ratchet代码中的会话cookie。

Apache服务器的index.html启动会话：

<?php
// Get the session ID.
$ses_id = session_id();
if (empty($ses_id)) {
    session_start();
    $ses_id = session_id();
}
?><!DOCTYPE html> ...

Ratchet MessageComponentInterface代码访问会话令牌：

public function onMessage(ConnectionInterface $from, $msg) {
    $sessionId = $from->WebSocket->request->getCookies()['PHPSESSID'];
    # Do stuff with the token...
}

一旦两个服务器都知道用户的会话令牌，他们就可以使用令牌通过MySQL数据库共享信息（这就是我所做的）：

    # Access session data from a database:
    $stmt = $this->mysqli->prepare("SELECT * FROM users WHERE cookie=?");
    $stmt->bind_param('s', $sessionId);
    $stmt->execute();
    $result = $stmt->get_result();

或者，您可以进行更奇特的进程间通信：

    # Ratchet server:
    $opts = array(
        'http'=>array(
            'method'=>'GET',
            'header'=>"Cookie: PHPSESSID=$sessionId\r\n"
        )
    );
    $context = stream_context_create($opts);
    $json = file_get_contents('http://localhost:80/get_session_info.php', false, $context);
    $session_data = json_decode($json);

    # Apache server's get_session_info.php
    # Note: restrict access to this path so that remote users can't dump
    # their own session data.
    echo json_encode($_SESSION);

Answer 2

这可能看起来有点笨拙，但这是我想出如何实现这一点的唯一方法。

假设您已经知道目录和 sessionId，您可以直接使用 session_encode(), session_decode() 从会话文件中读取数据，如下所示。我的会话文件以 sess_ 为前缀，其他人可能不是这样，所以请记住这一点。请注意，这将在从会话文件中提取变量后保存并恢复任何现有的 $_SESSION 数据：

$contents = file_get_contents($sessionDir . 'sess_' . $sessionId);
$sessionData = $this->decodeSession($contents);
return $sessionData;

private function decodeSession($sessionString)
{
   $currentSession = session_encode();
   foreach ($_SESSION as $key => $value){
     unset($_SESSION[$key]);
   }
   session_decode($sessionString);
   $sessionVariables = $_SESSION;
   foreach ($_SESSION as $key => $value){
     unset($_SESSION[$key]);
   }
   session_decode($currentSession);
   return $sessionVariables;
}

如何将$ _SESSION变量传递给websocket服务器？

2 个答案: