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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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