114 lines
3 KiB
PHP
114 lines
3 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* LCStore implementation which uses the standard DB functions to store data.
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* This will work on any MediaWiki installation.
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*/
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class LCStoreDB implements LCStore {
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/** @var string */
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private $currentLang;
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/** @var bool */
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private $writesDone = false;
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/** @var IDatabase */
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private $dbw;
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/** @var array */
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private $batch = [];
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/** @var bool */
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private $readOnly = false;
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public function get( $code, $key ) {
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if ( $this->writesDone && $this->dbw ) {
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$db = $this->dbw; // see the changes in finishWrite()
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} else {
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$db = wfGetDB( DB_SLAVE );
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}
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$value = $db->selectField(
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'l10n_cache',
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'lc_value',
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[ 'lc_lang' => $code, 'lc_key' => $key ],
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__METHOD__
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);
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return ( $value !== false ) ? unserialize( $db->decodeBlob( $value ) ) : null;
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}
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public function startWrite( $code ) {
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if ( $this->readOnly ) {
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return;
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} elseif ( !$code ) {
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throw new MWException( __METHOD__ . ": Invalid language \"$code\"" );
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}
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$this->dbw = wfGetDB( DB_MASTER );
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$this->readOnly = $this->dbw->isReadOnly();
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$this->currentLang = $code;
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$this->batch = [];
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}
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public function finishWrite() {
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if ( $this->readOnly ) {
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return;
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} elseif ( is_null( $this->currentLang ) ) {
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throw new MWException( __CLASS__ . ': must call startWrite() before finishWrite()' );
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}
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$this->dbw->startAtomic( __METHOD__ );
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try {
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$this->dbw->delete(
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'l10n_cache',
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[ 'lc_lang' => $this->currentLang ],
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__METHOD__
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);
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foreach ( array_chunk( $this->batch, 500 ) as $rows ) {
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$this->dbw->insert( 'l10n_cache', $rows, __METHOD__ );
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}
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$this->writesDone = true;
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} catch ( DBQueryError $e ) {
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if ( $this->dbw->wasReadOnlyError() ) {
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$this->readOnly = true; // just avoid site down time
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} else {
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throw $e;
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}
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}
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$this->dbw->endAtomic( __METHOD__ );
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$this->currentLang = null;
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$this->batch = [];
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}
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public function set( $key, $value ) {
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if ( $this->readOnly ) {
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return;
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} elseif ( is_null( $this->currentLang ) ) {
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throw new MWException( __CLASS__ . ': must call startWrite() before set()' );
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}
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$this->batch[] = [
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'lc_lang' => $this->currentLang,
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'lc_key' => $key,
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'lc_value' => $this->dbw->encodeBlob( serialize( $value ) )
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];
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}
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}
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