Php/docs/eventbufferevent.connecthost
EventBufferEvent::connectHost
(PECL event >= 1.2.6-beta)
EventBufferEvent::connectHost — Connects to a hostname with optionally asyncronous DNS resolving
Description
public
EventBufferEvent::connectHost
(
EventDnsBase
$dns_base
,
string
$hostname
,
int
$port
[,
int
$family
= EventUtil::AF_UNSPEC
] ) : bool
Resolves the DNS name hostname, looking for addresses of type
family
(
EventUtil::AF_*
constants). If the name resolution fails, it invokes the event callback
with an error event. If it succeeds, it launches a connection attempt just
as
EventBufferEvent::connect()
would.
dns_base
is optional. May be NULL
, or an object created with
EventDnsBase::__construct()
. For asyncronous hostname resolving pass a valid event dns base resource.
Otherwise the hostname resolving will block.
Note:
EventDnsBase is available only if
Event
configured --with-event-extra (event_extra
library, libevent protocol-specific functionality support including HTTP, DNS, and RPC ).
Note:
EventBufferEvent::connectHost() requires
libevent-2.0.3-alpha
or greater.
Parameters
dns_base
Object of EventDnsBase in case if DNS is to be resolved asyncronously. Otherwise
NULL
.hostname
Hostname to connect to. Recognized formats are:
www.example.com (hostname) 1.2.3.4 (ipv4address) ::1 (ipv6address) [::1] ([ipv6address])
port
Port number
family
Address family.
EventUtil::AF_UNSPEC
,EventUtil::AF_INET
, orEventUtil::AF_INET6
. See EventUtil constants .
Return Values
Returns TRUE
on success. Otherwise FALSE
.
Examples
Example #1 EventBufferEvent::connectHost() example
<?php/* Read callback */function readcb($bev, $base) { //$input = $bev->input; //$bev->getInput(); //$pos = $input->search("TTP"); $pos = $bev->input->search("TTP"); while (($n = $bev->input->remove($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();$dns_base = new EventDnsBase($base, TRUE); // We'll use async DNS resolvingif (!$dns_base) { exit("Failed to init DNS Base\n");}$bev = new EventBufferEvent($base, /* use internal socket */ NULL, EventBufferEvent::OPT_CLOSE_ON_FREE | EventBufferEvent::OPT_DEFER_CALLBACKS, "readcb", /* writecb */ NULL, "eventcb", $base);if (!$bev) { exit("Failed creating bufferevent socket\n");}//$bev->setCallbacks("readcb", /* writecb */ NULL, "eventcb", $base);$bev->enable(Event::READ | Event::WRITE);$output = $bev->output; //$bev->getOutput();if (!$output->add( "GET {$argv[2]} HTTP/1.0\r\n". "Host: {$argv[1]}\r\n". "Connection: Close\r\n\r\n")) { exit("Failed adding request to output buffer\n");}if (!$bev->connectHost($dns_base, $argv[1], 80, EventUtil::AF_UNSPEC)) { exit("Can't connect to host {$argv[1]}\n");}$base->dispatch();?>
The above example will output something similar to:
Connected. HTTP/1.0 301 Moved Permanently Location: http://www.google.co.uk/ Content-Type: text/html; charset=UTF-8 Date: Sat, 09 Mar 2013 12:21:19 GMT Expires: Mon, 08 Apr 2013 12:21:19 GMT Cache-Control: public, max-age=2592000 Server: gws Content-Length: 221 X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> <TITLE>301 Moved</TITLE></HEAD><BODY> <H1>301 Moved</H1> The document has moved <A HREF="http://www.google.co.uk/">here</A>. </BODY></HTML> Closing Done
See Also
- EventBufferEvent::connect() - Connect buffer event's file descriptor to given address or UNIX socket