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    EventHttpConnection::setCloseCallback

    (PECL event >= 1.8.0)

    EventHttpConnection::setCloseCallback — Set callback for connection close

    説明

    public EventHttpConnection::setCloseCallback( callable $callback , mixed $data = ?): void

    Sets callback for connection close.

    パラメータ

    callback

    Callback which is called when connection is closed. Should match the following prototype:

    callback( EventHttpConnection $conn = null , mixed $arg = null ): void

    戻り値

    値を返しません。

    例

    例1 EventHttpConnection::setCloseCallback() example

    <?php
    /*
    * Setting up close-connection callback
    *
    * The script handles closed connections using HTTP API.
    *
    * Usage:
    * 1) Launch the server:
    * $ php examples/http_closecb.php 4242
    *
    * 2) Launch a client in another terminal. Telnet-like
    * session should look like the following:
    *
    * $ nc -t 127.0.0.1 4242
    * GET / HTTP/1.0
    * Connection: close
    *
    * The server will output something similar to the following:
    *
    * HTTP/1.0 200 OK
    * Content-Type: multipart/x-mixed-replace;boundary=boundarydonotcross
    * Connection: close
    *
    * <html>
    *
    * 3) Terminate the client connection abruptly,
    * i.e. kill the process, or just press Ctrl-C.
    *
    * 4) Check if the server called _close_callback.
    * The script should output "_close_callback" string to standard output.
    *
    * 5) Check if the server's process has no orphaned connections,
    * e.g. with `lsof` utility.
    */

    function _close_callback($conn)
    {
    echo     __FUNCTION__, PHP_EOL;
    }

    function     _http_default($req, $dummy)
    {
    $conn = $req->getConnection();
    $conn->setCloseCallback('_close_callback', NULL);

    /*
    By enabling Event::READ we protect the server against unclosed conections.
    This is a peculiarity of Libevent. The library disables Event::READ events
    on this connection, and the server is not notified about terminated
    connections.

    So each time client terminates connection abruptly, we get an orphaned
    connection. For instance, the following is a part of `lsof -p $PID | grep TCP`
    command after client has terminated connection:

    57-php 15057 ruslan 6u unix 0xffff8802fb59c780 0t0 125187 socket
    58:php 15057 ruslan 7u IPv4 125189 0t0 TCP *:4242 (LISTEN)
    59:php 15057 ruslan 8u IPv4 124342 0t0 TCP localhost:4242->localhost:37375 (CLOSE_WAIT)

    where $PID is our process ID.

    The following block of code fixes such kind of orphaned connections.
    */
    $bev = $req->getBufferEvent();
    $bev->enable(Event::READ);
    // We have to free it explicitly. See
    EventHttpRequest::getConnection()
    $bev->free(); // we have to free it explicitly

    $req->addHeader(
    'Content-Type',
    'multipart/x-mixed-replace;boundary=boundarydonotcross',
    EventHttpRequest::OUTPUT_HEADER
    );

    $buf = new EventBuffer();
    $buf->add('<html>');

    $req->sendReply(200, "OK");
    $req->sendReplyChunk($buf);
    }

    $port = 4242;
    if ($argc > 1) {
    $port = (int) $argv[1];
    }
    if ($port <= 0 || $port > 65535) {
    exit("Invalid port");
    }

    $base = new EventBase();
    $http = new EventHttp($base);

    $http->setDefaultCallback("_http_default", NULL);
    $http->bind("0.0.0.0", $port);
    $base->loop();

    ?>
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