Connect buffer event's file descriptor to given address or UNIX socket

# EventBufferEvent::connect

(PECL event >= 1.2.6-beta)

EventBufferEvent::connect — Connect buffer event's file descriptor to given address or UNIX socket

### 説明

public function EventBufferEvent::connect( string `$addr` ): bool

Connect buffer event's file descriptor to given address(optionally with port), or a UNIX domain socket.

If socket is not assigned to the buffer event, this function allocates a new socket and makes it non-blocking internally.

To resolve DNS names(asynchronously), use EventBufferEvent::connectHost() method.

### パラメータ

`addr`

  Should contain an IP address with optional port number, or a path to UNIX domain socket. Recognized formats are:

      [IPv6Address]:port
      [IPv6Address]
      IPv6Address
      IPv4Address:port
      IPv4Address
      unix:path

  Note, `'unix:'` prefix is currently not case sensitive.

### 戻り値

成功した場合に `true` を、失敗した場合に `false` を返します。

### 例

例1 EventBufferEvent::connect() example

    <?php
    /*
     * 1. Connect to 127.0.0.1 at port 80
     * by means of EventBufferEvent::connect().
     *
     * 2. Request /index.cphp via HTTP/1.0
     * using the output buffer.
     *
     * 3. Asynchronously read the response and print it to stdout.
     */

    /* Read callback */
    function readcb($bev, $base) {
        $input = $bev->getInput();

        while (($n = $input->remove($buf, 1024)) > 0) {
            echo $buf;
        }
    }

    /* Event callback */
    function eventcb($bev, $events, $base) {
        if ($events & EventBufferEvent::CONNECTED) {
            echo "Connected.\n";
        } elseif ($events & (EventBufferEvent::ERROR | EventBufferEvent::EOF)) {
            if ($events & EventBufferEvent::ERROR) {
                echo "DNS error: ", $bev->getDnsErrorString(), PHP_EOL;
            }

            echo "Closing\n";
            $base->exit();
            exit("Done\n");
        }
    }

    $base = new EventBase();

    echo "step 1\n";
    $bev = new EventBufferEvent($base, /* use internal socket */ NULL,
        EventBufferEvent::OPT_CLOSE_ON_FREE | EventBufferEvent::OPT_DEFER_CALLBACKS);
    if (!$bev) {
        exit("Failed creating bufferevent socket\n");
    }

    echo "step 2\n";
    $bev->setCallbacks("readcb", /* writecb */ NULL, "eventcb", $base);
    $bev->enable(Event::READ | Event::WRITE);

    echo "step 3\n";
    /* Send request */
    $output = $bev->getOutput();
    if (!$output->add(
        "GET /index.cphp HTTP/1.0\r\n".
        "Connection: Close\r\n\r\n"
    )) {
        exit("Failed adding request to output buffer\n");
    }

    /* Connect to the host synchronously.
     * We know the IP, and don't need to resolve DNS. */
    if (!$bev->connect("127.0.0.1:80")) {
        exit("Can't connect to host\n");
    }

    /* Dispatch pending events */
    $base->dispatch();

上の例の出力は、 たとえば以下のようになります。

    step 1
    step 2
    step 3
    Connected.
    HTTP/1.1 200 OK
    Server: nginx/1.2.6
    Date: Sat, 09 Mar 2013 10:06:58 GMT
    Content-Type: text/html; charset=utf-8
    Connection: close
    X-Powered-By: PHP/5.4.11--pl2-gentoo

    sdfsdfsf
    Closing
    Done

例2 Connect to UNIX domain socket which presumably is served by a server, read response from the server and output it to the console

    <?php
    class MyUnixSocketClient {
        private $base, $bev;

        function __construct($base, $sock_path) {
            $this->base = $base;
            $this->bev = new EventBufferEvent($base, NULL, EventBufferEvent::OPT_CLOSE_ON_FREE,
                array ($this, "read_cb"), NULL, array ($this, "event_cb"));

            if (!$this->bev->connect("unix:$sock_path")) {
                trigger_error("Failed to connect to socket `$sock_path'", E_USER_ERROR);
            }

            $this->bev->enable(Event::READ);
        }

        function __destruct() {
            if ($this->bev) {
                $this->bev->free();
                $this->bev = NULL;
            }
        }

        function dispatch() {
            $this->base->dispatch();
        }

        function read_cb($bev, $unused) {
            $in = $bev->input;

            printf("Received %ld bytes\n", $in->length);
            printf("----- data ----\n");
            printf("%ld:\t%s\n", (int) $in->length, $in->pullup(-1));

            $this->bev->free();
            $this->bev = NULL;
            $this->base->exit(NULL);
        }

        function event_cb($bev, $events, $unused) {
            if ($events & EventBufferEvent::ERROR) {
                echo "Error from bufferevent\n";
            }

            if ($events & (EventBufferEvent::EOF | EventBufferEvent::ERROR)) {
                $bev->free();
                $bev = NULL;
            } elseif ($events & EventBufferEvent::CONNECTED) {
                $bev->output->add("test\n");
            }
        }
    }

    if ($argc <= 1) {
        exit("Socket path is not provided\n");
    }
    $sock_path = $argv[1];

    $base = new EventBase();
    $cl = new MyUnixSocketClient($base, $sock_path);
    $cl->dispatch();
    ?>

上の例の出力は、 たとえば以下のようになります。

    Received 5 bytes
    ----- data ----
    5:  test

### 参考

- EventBufferEvent::connectHost() - Connects to a hostname with optionally asynchronous DNS resolving

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