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<?php
/**
* Squid and Varnish cache purging.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
class SquidPurgeClientPool {
/** @var array Array of SquidPurgeClient */
protected $clients = [];
/** @var int */
protected $timeout = 5;
/**
* @param array $options
*/
function __construct( $options = [] ) {
if ( isset( $options['timeout'] ) ) {
$this->timeout = $options['timeout'];
}
}
/**
* @param SquidPurgeClient $client
* @return void
*/
public function addClient( $client ) {
$this->clients[] = $client;
}
public function run() {
$done = false;
$startTime = microtime( true );
while ( !$done ) {
$readSockets = $writeSockets = [];
/**
* @var $client SquidPurgeClient
*/
foreach ( $this->clients as $clientIndex => $client ) {
$sockets = $client->getReadSocketsForSelect();
foreach ( $sockets as $i => $socket ) {
$readSockets["$clientIndex/$i"] = $socket;
}
$sockets = $client->getWriteSocketsForSelect();
foreach ( $sockets as $i => $socket ) {
$writeSockets["$clientIndex/$i"] = $socket;
}
}
if ( !count( $readSockets ) && !count( $writeSockets ) ) {
break;
}
$exceptSockets = null;
$timeout = min( $startTime + $this->timeout - microtime( true ), 1 );
MediaWiki\suppressWarnings();
$numReady = socket_select( $readSockets, $writeSockets, $exceptSockets, $timeout );
MediaWiki\restoreWarnings();
if ( $numReady === false ) {
wfDebugLog( 'squid', __METHOD__ . ': Error in stream_select: ' .
socket_strerror( socket_last_error() ) . "\n" );
break;
}
// Check for timeout, use 1% tolerance since we aimed at having socket_select()
// exit at precisely the overall timeout
if ( microtime( true ) - $startTime > $this->timeout * 0.99 ) {
wfDebugLog( 'squid', __CLASS__ . ": timeout ({$this->timeout}s)\n" );
break;
} elseif ( !$numReady ) {
continue;
}
foreach ( $readSockets as $key => $socket ) {
list( $clientIndex, ) = explode( '/', $key );
$client = $this->clients[$clientIndex];
$client->doReads();
}
foreach ( $writeSockets as $key => $socket ) {
list( $clientIndex, ) = explode( '/', $key );
$client = $this->clients[$clientIndex];
$client->doWrites();
}
$done = true;
foreach ( $this->clients as $client ) {
if ( !$client->isIdle() ) {
$done = false;
}
}
}
foreach ( $this->clients as $client ) {
$client->close();
}
}
}