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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 Cdb\Exception;
use Cdb\Reader;
use Cdb\Writer;
/**
* LCStore implementation which stores data as a collection of CDB files in the
* directory given by $wgCacheDirectory. If $wgCacheDirectory is not set, this
* will throw an exception.
*
* Profiling indicates that on Linux, this implementation outperforms MySQL if
* the directory is on a local filesystem and there is ample kernel cache
* space. The performance advantage is greater when the DBA extension is
* available than it is with the PHP port.
*
* See Cdb.php and https://cr.yp.to/cdb.html
*/
class LCStoreCDB implements LCStore {
/** @var Reader[] */
private $readers;
/** @var Writer */
private $writer;
/** @var string Current language code */
private $currentLang;
/** @var bool|string Cache directory. False if not set */
private $directory;
function __construct( $conf = [] ) {
global $wgCacheDirectory;
if ( isset( $conf['directory'] ) ) {
$this->directory = $conf['directory'];
} else {
$this->directory = $wgCacheDirectory;
}
}
public function get( $code, $key ) {
if ( !isset( $this->readers[$code] ) ) {
$fileName = $this->getFileName( $code );
$this->readers[$code] = false;
if ( file_exists( $fileName ) ) {
try {
$this->readers[$code] = Reader::open( $fileName );
} catch ( Exception $e ) {
wfDebug( __METHOD__ . ": unable to open cdb file for reading\n" );
}
}
}
if ( !$this->readers[$code] ) {
return null;
} else {
$value = false;
try {
$value = $this->readers[$code]->get( $key );
} catch ( Exception $e ) {
wfDebug( __METHOD__ . ": \Cdb\Exception caught, error message was "
. $e->getMessage() . "\n" );
}
if ( $value === false ) {
return null;
}
return unserialize( $value );
}
}
public function startWrite( $code ) {
if ( !file_exists( $this->directory ) ) {
if ( !wfMkdirParents( $this->directory, null, __METHOD__ ) ) {
throw new MWException( "Unable to create the localisation store " .
"directory \"{$this->directory}\"" );
}
}
// Close reader to stop permission errors on write
if ( !empty( $this->readers[$code] ) ) {
$this->readers[$code]->close();
}
try {
$this->writer = Writer::open( $this->getFileName( $code ) );
} catch ( Exception $e ) {
throw new MWException( $e->getMessage() );
}
$this->currentLang = $code;
}
public function finishWrite() {
// Close the writer
try {
$this->writer->close();
} catch ( Exception $e ) {
throw new MWException( $e->getMessage() );
}
$this->writer = null;
unset( $this->readers[$this->currentLang] );
$this->currentLang = null;
}
public function set( $key, $value ) {
if ( is_null( $this->writer ) ) {
throw new MWException( __CLASS__ . ': must call startWrite() before calling set()' );
}
try {
$this->writer->set( $key, serialize( $value ) );
} catch ( Exception $e ) {
throw new MWException( $e->getMessage() );
}
}
protected function getFileName( $code ) {
if ( strval( $code ) === '' || strpos( $code, '/' ) !== false ) {
throw new MWException( __METHOD__ . ": Invalid language \"$code\"" );
}
return "{$this->directory}/l10n_cache-$code.cdb";
}
}
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