How to bind fd and uid in swoole

In Swoole, fd and uid can be bound through the onOpen event listener: get the uid sent by the client; use the $server->bind method to bind uid to fd. When the client closes the connection, you can unbind fd and uid through the onClose event listener: get the client's fd; use the $server->unbind method to remove uid from fd.

Binding of fd and uid in Swoole

In the Swoole network server, each is established with the client All connections will be assigned a file descriptor (fd). To track the identity of the user behind each connection, a unique identifier (uid) can be used to correlate fd and uid.

How to bind fd and uid

In Swoole, you can use the onOpen event listener to bind fd and uid. This event is fired when a new client connection is established. In the event listener, you can use the following steps to bind fd and uid:

1. Get the uid sent by the client: for HTTP requests, you can get the uid through GET or POST parameters; for WebSocket connections, you can Get uid through WebSocket handshake information.
2. Save the client's uid into the Swoole server object: You can use the $server->bind method to bind the uid to the fd. The syntax of this method is as follows:

<code class="php">public Server::bind(int $fd, int $reactor_id, int $uid);</code>

Where:

• $fd: client’s fd
• $reactor_id : Reactor id that handles client requests
• $uid: Client’s uid

Example

The following example shows how to bind fd and uid in the onOpen event listener:

<code class="php">public function onOpen(Swoole\Server $server, Swoole\Http\Request $request)
{
    // 获取客户端的 uid
    $uid = $request->get['uid'];

    // 将 uid 绑定到 fd
    $server->bind($request->fd, $request->reactorId, $uid);
}</code>

Unbind fd and uid

When the client When the client closes the connection, you can use the onClose event listener to unbind fd and uid. In the event listener, you can use the following steps to unbind fd and uid:

1. Get the client's fd: You can get the fd in the method parameter $fd of the event listener.
2. Remove uid from Swoole server object: You can use the $server->unbind method to delete uid from fd. The syntax of this method is as follows:

<code class="php">public Server::unbind(int $fd);</code>

Among them:

• $fd: the fd to be unbound

Example

The following example shows how to unbind fd and uid in the onClose event listener:

<code class="php">public function onClose(Swoole\Server $server, int $fd)
{
    // 从 fd 中删除 uid
    $server->unbind($fd);
}</code>

By binding fd and uid, The Swoole server can track the user identity behind each connection and provide customized services for different users.

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