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<?php
/**
* 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
*/
namespace MediaWiki\PoolCounter;
use InvalidArgumentException;
use MediaWiki\Status\Status;
use Wikimedia\IPUtils;
/**
* Helper for \MediaWiki\PoolCounter\PoolCounterClient.
*
* @internal
* @since 1.16
*/
class PoolCounterConnectionManager {
/** @var string[] */
public $hostNames;
/** @var array */
public $conns = [];
/** @var array */
public $refCounts = [];
/** @var float */
public $timeout;
/** @var int */
public $connect_timeout;
/**
* @internal Public for testing only
* @var string
*/
public $host;
/**
* @internal Public for testing only
* @var int
*/
public $port;
/**
* @param array $conf
*/
public function __construct( $conf ) {
if ( !count( $conf['servers'] ) ) {
throw new InvalidArgumentException( __METHOD__ . ': no servers configured' );
}
$this->hostNames = $conf['servers'];
$this->timeout = $conf['timeout'] ?? 0.1;
$this->connect_timeout = $conf['connect_timeout'] ?? 0;
}
/**
* @param string $key
* @return Status
*/
public function get( $key ) {
$hashes = [];
foreach ( $this->hostNames as $hostName ) {
$hashes[$hostName] = md5( $hostName . $key );
}
asort( $hashes );
$errno = 0;
$errstr = '';
$hostName = '';
$conn = null;
foreach ( $hashes as $hostName => $hash ) {
if ( isset( $this->conns[$hostName] ) ) {
$this->refCounts[$hostName]++;
return Status::newGood(
[ 'conn' => $this->conns[$hostName], 'hostName' => $hostName ] );
}
$parts = IPUtils::splitHostAndPort( $hostName );
if ( $parts === false ) {
$errstr = '\'servers\' config incorrectly configured.';
return Status::newFatal( 'poolcounter-connection-error', $errstr, $hostName );
}
// IPV6 addresses need to be in brackets otherwise it fails.
$this->host = IPUtils::isValidIPv6( $parts[0] ) ? '[' . $parts[0] . ']' : $parts[0];
$this->port = $parts[1] ?: 7531;
// phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
$conn = @$this->open( $this->host, $this->port, $errno, $errstr );
if ( $conn ) {
break;
}
}
if ( !$conn ) {
return Status::newFatal( 'poolcounter-connection-error', $errstr, $hostName );
}
// TODO: Inject PSR Logger from ServiceWiring
wfDebug( "Connected to pool counter server: $hostName\n" );
$this->conns[$hostName] = $conn;
$this->refCounts[$hostName] = 1;
return Status::newGood( [ 'conn' => $conn, 'hostName' => $hostName ] );
}
/**
* Open a socket. Just a wrapper for fsockopen()
* @param string $host
* @param int $port
* @param int &$errno
* @param string &$errstr
* @return null|resource
*/
private function open( $host, $port, &$errno, &$errstr ) {
// If connect_timeout is set, we try to open the socket twice.
// You usually want to set the connection timeout to a very
// small value so that in case of failure of a server the
// connection to poolcounter is not a SPOF.
if ( $this->connect_timeout > 0 ) {
$tries = 2;
$timeout = $this->connect_timeout;
} else {
$tries = 1;
$timeout = $this->timeout;
}
$fp = null;
while ( true ) {
$fp = fsockopen( $host, $port, $errno, $errstr, $timeout );
if ( $fp !== false || --$tries < 1 ) {
break;
}
usleep( 1000 );
}
return $fp;
}
/**
* @param resource $conn
*/
public function close( $conn ) {
foreach ( $this->conns as $hostName => $otherConn ) {
if ( $conn === $otherConn ) {
if ( $this->refCounts[$hostName] ) {
$this->refCounts[$hostName]--;
}
if ( !$this->refCounts[$hostName] ) {
fclose( $conn );
unset( $this->conns[$hostName] );
}
}
}
}
}