134 lines
3.6 KiB
PHP
134 lines
3.6 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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use Cdb\Exception;
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use Cdb\Reader;
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use Cdb\Writer;
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/**
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* LCStore implementation which stores data as a collection of CDB files.
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*
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* Profiling indicates that on Linux, this implementation outperforms MySQL if
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* the directory is on a local filesystem and there is ample kernel cache
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* space. The performance advantage is greater when the DBA extension is
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* available than it is with the PHP port.
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*
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* See Cdb.php and https://cr.yp.to/cdb.html
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*/
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class LCStoreCDB implements LCStore {
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/** @var Reader[]|false[] */
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private $readers;
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/** @var Writer|null */
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private $writer;
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/** @var string Current language code */
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private $currentLang;
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/** @var string Cache directory */
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private $directory;
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public function __construct( $conf = [] ) {
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$this->directory = $conf['directory'];
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}
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public function get( $code, $key ) {
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if ( !isset( $this->readers[$code] ) ) {
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$fileName = $this->getFileName( $code );
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$this->readers[$code] = false;
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if ( file_exists( $fileName ) ) {
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try {
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$this->readers[$code] = Reader::open( $fileName );
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} catch ( Exception $e ) {
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wfDebug( __METHOD__ . ": unable to open cdb file for reading" );
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}
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}
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}
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if ( !$this->readers[$code] ) {
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return null;
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} else {
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$value = false;
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try {
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$value = $this->readers[$code]->get( $key );
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} catch ( Exception $e ) {
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wfDebug( __METHOD__ . ": \Cdb\Exception caught, error message was "
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. $e->getMessage() );
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}
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if ( $value === false ) {
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return null;
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}
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return unserialize( $value );
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}
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}
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public function startWrite( $code ) {
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if ( !file_exists( $this->directory ) && !wfMkdirParents( $this->directory, null, __METHOD__ ) ) {
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throw new MWException( "Unable to create the localisation store " .
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"directory \"{$this->directory}\"" );
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}
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// Close reader to stop permission errors on write
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if ( !empty( $this->readers[$code] ) ) {
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$this->readers[$code]->close();
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}
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try {
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$this->writer = Writer::open( $this->getFileName( $code ) );
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} catch ( Exception $e ) {
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throw new MWException( $e->getMessage() );
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}
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$this->currentLang = $code;
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}
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public function finishWrite() {
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// Close the writer
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try {
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$this->writer->close();
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} catch ( Exception $e ) {
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throw new MWException( $e->getMessage() );
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}
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$this->writer = null;
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unset( $this->readers[$this->currentLang] );
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$this->currentLang = null;
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}
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public function set( $key, $value ) {
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if ( $this->writer === null ) {
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throw new MWException( __CLASS__ . ': must call startWrite() before calling set()' );
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}
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try {
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$this->writer->set( $key, serialize( $value ) );
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} catch ( Exception $e ) {
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throw new MWException( $e->getMessage() );
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}
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}
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protected function getFileName( $code ) {
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if ( strval( $code ) === '' || strpos( $code, '/' ) !== false ) {
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throw new MWException( __METHOD__ . ": Invalid language \"$code\"" );
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}
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return "{$this->directory}/l10n_cache-$code.cdb";
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}
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}
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