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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] ); } } } } }
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