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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 */ use MediaWiki\MediaWikiServices; use Wikimedia\Rdbms\DBQueryError; use Wikimedia\Rdbms\IDatabase; use Wikimedia\ScopedCallback; /** * LCStore implementation which uses the standard DB functions to store data. * * @ingroup Language */ class LCStoreDB implements LCStore { /** @var string|null Language code */ private $code; /** @var array Server configuration map */ private $server; /** @var array Rows buffered for insertion */ private $batch = []; /** @var IDatabase|null */ private $dbw; /** @var bool Whether write batch was recently written */ private $writesDone = false; /** @var bool Whether the DB is read-only or otherwise unavailable for writing */ private $readOnly = false; public function __construct( $params ) { $this->server = $params['server'] ?? []; } public function get( $code, $key ) { if ( $this->server || $this->writesDone ) { // If a server configuration map is specified, always used that connection // for reads and writes. Otherwise, if writes occurred in finishWrite(), make // sure those changes are always visible. $db = $this->getWriteConnection(); } else { $db = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); } $value = $db->newSelectQueryBuilder() ->select( 'lc_value' ) ->from( 'l10n_cache' ) ->where( [ 'lc_lang' => $code, 'lc_key' => $key ] ) ->caller( __METHOD__ )->fetchField(); return ( $value !== false ) ? unserialize( $db->decodeBlob( $value ) ) : null; } public function startWrite( $code ) { if ( $this->readOnly ) { return; } elseif ( !$code ) { throw new InvalidArgumentException( __METHOD__ . ": Invalid language \"$code\"" ); } $dbw = $this->getWriteConnection(); $this->readOnly = $dbw->isReadOnly(); $this->code = $code; $this->batch = []; } public function finishWrite() { if ( $this->readOnly ) { return; } elseif ( $this->code === null ) { throw new LogicException( __CLASS__ . ': must call startWrite() before finishWrite()' ); } $scope = Profiler::instance()->getTransactionProfiler()->silenceForScope(); $dbw = $this->getWriteConnection(); $dbw->startAtomic( __METHOD__ ); try { $dbw->newDeleteQueryBuilder() ->deleteFrom( 'l10n_cache' ) ->where( [ 'lc_lang' => $this->code ] ) ->caller( __METHOD__ )->execute(); foreach ( array_chunk( $this->batch, 500 ) as $rows ) { $dbw->newInsertQueryBuilder() ->insertInto( 'l10n_cache' ) ->rows( $rows ) ->caller( __METHOD__ )->execute(); } $this->writesDone = true; } catch ( DBQueryError $e ) { if ( $dbw->isReadOnly() ) { $this->readOnly = true; // just avoid site downtime } else { throw $e; } } $dbw->endAtomic( __METHOD__ ); ScopedCallback::consume( $scope ); $this->code = null; $this->batch = []; } public function set( $key, $value ) { if ( $this->readOnly ) { return; } elseif ( $this->code === null ) { throw new LogicException( __CLASS__ . ': must call startWrite() before set()' ); } $dbw = $this->getWriteConnection(); $this->batch[] = [ 'lc_lang' => $this->code, 'lc_key' => $key, 'lc_value' => $dbw->encodeBlob( serialize( $value ) ) ]; } /** * @return IDatabase */ private function getWriteConnection() { if ( !$this->dbw ) { if ( $this->server ) { $dbFactory = MediaWikiServices::getInstance()->getDatabaseFactory(); $this->dbw = $dbFactory->create( $this->server['type'], $this->server ); if ( !$this->dbw ) { throw new RuntimeException( __CLASS__ . ': failed to obtain a DB connection' ); } } else { $this->dbw = MediaWikiServices::getInstance()->getConnectionProvider()->getPrimaryDatabase(); } } return $this->dbw; } }
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