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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 Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\DBQueryError;
/**
* LCStore implementation which uses the standard DB functions to store data.
* This will work on any MediaWiki installation.
*/
class LCStoreDB implements LCStore {
/** @var string */
private $currentLang;
/** @var bool */
private $writesDone = false;
/** @var IDatabase */
private $dbw;
/** @var array */
private $batch = [];
/** @var bool */
private $readOnly = false;
public function get( $code, $key ) {
if ( $this->writesDone && $this->dbw ) {
$db = $this->dbw; // see the changes in finishWrite()
} else {
$db = wfGetDB( DB_REPLICA );
}
$value = $db->selectField(
'l10n_cache',
'lc_value',
[ 'lc_lang' => $code, 'lc_key' => $key ],
__METHOD__
);
return ( $value !== false ) ? unserialize( $db->decodeBlob( $value ) ) : null;
}
public function startWrite( $code ) {
if ( $this->readOnly ) {
return;
} elseif ( !$code ) {
throw new MWException( __METHOD__ . ": Invalid language \"$code\"" );
}
$this->dbw = wfGetDB( DB_MASTER );
$this->readOnly = $this->dbw->isReadOnly();
$this->currentLang = $code;
$this->batch = [];
}
public function finishWrite() {
if ( $this->readOnly ) {
return;
} elseif ( is_null( $this->currentLang ) ) {
throw new MWException( __CLASS__ . ': must call startWrite() before finishWrite()' );
}
$this->dbw->startAtomic( __METHOD__ );
try {
$this->dbw->delete(
'l10n_cache',
[ 'lc_lang' => $this->currentLang ],
__METHOD__
);
foreach ( array_chunk( $this->batch, 500 ) as $rows ) {
$this->dbw->insert( 'l10n_cache', $rows, __METHOD__ );
}
$this->writesDone = true;
} catch ( DBQueryError $e ) {
if ( $this->dbw->wasReadOnlyError() ) {
$this->readOnly = true; // just avoid site down time
} else {
throw $e;
}
}
$this->dbw->endAtomic( __METHOD__ );
$this->currentLang = null;
$this->batch = [];
}
public function set( $key, $value ) {
if ( $this->readOnly ) {
return;
} elseif ( is_null( $this->currentLang ) ) {
throw new MWException( __CLASS__ . ': must call startWrite() before set()' );
}
$this->batch[] = [
'lc_lang' => $this->currentLang,
'lc_key' => $key,
'lc_value' => $this->dbw->encodeBlob( serialize( $value ) )
];
}
}
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