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EventBufferEvent::connect

(PECL event >= 1.2.6-beta)

EventBufferEvent::connectConnect buffer event's file descriptor to given address or UNIX socket

Beschreibung

public 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(asyncronously), use EventBufferEvent::connectHost() method.

Parameter-Liste

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.

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

Beispiele

Beispiel #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. Asyncronously 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 syncronously.
* 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();

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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

Beispiel #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();
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

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

Siehe auch

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