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<?php |
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/** |
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* Object caching using PHP's APC accelerator. |
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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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* @ingroup Cache |
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*/ |
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/** |
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* This is a wrapper for APC's shared memory functions |
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* |
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* @ingroup Cache |
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*/ |
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class APCBagOStuff extends BagOStuff { |
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/** |
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* @var bool If true, trust the APC implementation to serialize and |
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* deserialize objects correctly. If false, (de-)serialize in PHP. |
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*/ |
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protected $nativeSerialize; |
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/** |
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* @var string String to append to each APC key. This may be changed |
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* whenever the handling of values is changed, to prevent existing code |
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* from encountering older values which it cannot handle. |
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*/ |
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const KEY_SUFFIX = ':2'; |
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/** |
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* Constructor |
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* |
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* Available parameters are: |
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* - nativeSerialize: If true, pass objects to apc_store(), and trust it |
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* to serialize them correctly. If false, serialize |
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* all values in PHP. |
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* |
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* @param array $params |
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*/ |
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public function __construct( array $params = [] ) { |
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parent::__construct( $params ); |
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if ( isset( $params['nativeSerialize'] ) ) { |
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$this->nativeSerialize = $params['nativeSerialize']; |
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} elseif ( extension_loaded( 'apcu' ) && ini_get( 'apc.serializer' ) === 'default' ) { |
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// APCu has a memory corruption bug when the serializer is set to 'default'. |
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// See T120267, and upstream bug reports: |
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// - https://github.com/krakjoe/apcu/issues/38 |
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// - https://github.com/krakjoe/apcu/issues/35 |
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// - https://github.com/krakjoe/apcu/issues/111 |
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$this->logger->warning( |
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'The APCu extension is loaded and the apc.serializer INI setting ' . |
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'is set to "default". This can cause memory corruption! ' . |
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'You should change apc.serializer to "php" instead. ' . |
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'See <https://github.com/krakjoe/apcu/issues/38>.' |
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); |
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$this->nativeSerialize = false; |
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} else { |
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$this->nativeSerialize = true; |
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} |
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} |
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protected function doGet( $key, $flags = 0 ) { |
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return $this->getUnserialize( |
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apc_fetch( $key . self::KEY_SUFFIX ) |
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); |
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} |
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protected function getUnserialize( $value ) { |
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if ( is_string( $value ) && !$this->nativeSerialize ) { |
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$value = $this->isInteger( $value ) |
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? intval( $value ) |
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: unserialize( $value ); |
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} |
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return $value; |
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} |
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public function set( $key, $value, $exptime = 0, $flags = 0 ) { |
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apc_store( |
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$key . self::KEY_SUFFIX, |
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$this->setSerialize( $value ), |
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$exptime |
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); |
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return true; |
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} |
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protected function setSerialize( $value ) { |
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if ( !$this->nativeSerialize && !$this->isInteger( $value ) ) { |
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$value = serialize( $value ); |
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} |
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return $value; |
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} |
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public function delete( $key ) { |
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apc_delete( $key . self::KEY_SUFFIX ); |
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return true; |
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} |
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public function incr( $key, $value = 1 ) { |
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return apc_inc( $key . self::KEY_SUFFIX, $value ); |
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} |
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public function decr( $key, $value = 1 ) { |
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return apc_dec( $key . self::KEY_SUFFIX, $value ); |
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} |
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} |
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wikimedia /
mediawiki
