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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
*/
namespace Wikimedia\ObjectCache;
/**
* Store data in the local server memory via APCu (php-apcu)
*
* Past issues of note:
* - Memory corruption when `apc.serializer=default` in INI:
* https://phabricator.wikimedia.org/T120267
* - We used to recommend `apc.serializer=php` as non-default setting, and if not set,
* applied serialize() manually to workaround bugs and to create values we can use
* as CAS tokens. Upstream defaults to serializer=php since php-apcu 5.1.15 (2018).
* https://gerrit.wikimedia.org/r/671634
*
* @see https://www.php.net/apcu
* @ingroup Cache
*/
class APCUBagOStuff extends MediumSpecificBagOStuff {
/**
* @var string String to append to each APC key. This may be changed
* whenever the handling of values is changed, to prevent existing code
* from encountering older values which it cannot handle.
*/
private const KEY_SUFFIX = ':5';
/** @var int Max attempts for implicit CAS operations */
private static $CAS_MAX_ATTEMPTS = 100;
public function __construct( array $params = [] ) {
// No use in segmenting values
$params['segmentationSize'] = INF;
parent::__construct( $params );
// Versions of apcu < 5.1.19 use apc.use_request_time=1 by default, causing new keys
// to be assigned timestamps based on the start of the PHP request/script. The longer
// the request has been running, the more likely that newly stored keys will instantly
// be seen as expired by other requests. Disable apc.use_request_time.
ini_set( 'apc.use_request_time', '0' );
if ( PHP_SAPI === 'cli' ) {
$this->attrMap[self::ATTR_DURABILITY] = ini_get( 'apc.enable_cli' )
? self::QOS_DURABILITY_SCRIPT
: self::QOS_DURABILITY_NONE;
} else {
$this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_SERVICE;
}
}
protected function doGet( $key, $flags = 0, &$casToken = null ) {
$getToken = ( $casToken === self::PASS_BY_REF );
$casToken = null;
$value = apcu_fetch( $key . self::KEY_SUFFIX );
if ( $getToken && $value !== false ) {
// Note that if the driver handles serialization then this uses the PHP value
// as the token. This might require inspection or re-serialization in doCas().
$casToken = $value;
}
return $value;
}
protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) {
$ttl = $this->getExpirationAsTTL( $exptime );
return apcu_store( $key . self::KEY_SUFFIX, $value, $ttl );
}
protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) {
if ( apcu_exists( $key . self::KEY_SUFFIX ) ) {
// Avoid global write locks for high contention keys
return false;
}
$ttl = $this->getExpirationAsTTL( $exptime );
return apcu_add( $key . self::KEY_SUFFIX, $value, $ttl );
}
protected function doDelete( $key, $flags = 0 ) {
apcu_delete( $key . self::KEY_SUFFIX );
return true;
}
protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) {
// Use apcu 5.1.12 $ttl argument if apcu_inc() will initialize to $init:
// https://www.php.net/manual/en/function.apcu-inc.php
if ( $step === $init ) {
/** @noinspection PhpMethodParametersCountMismatchInspection */
$ttl = $this->getExpirationAsTTL( $exptime );
$result = apcu_inc( $key . self::KEY_SUFFIX, $step, $success, $ttl );
} else {
$result = false;
for ( $i = 0; $i < self::$CAS_MAX_ATTEMPTS; ++$i ) {
$oldCount = apcu_fetch( $key . self::KEY_SUFFIX );
if ( $oldCount === false ) {
$count = $init;
$ttl = $this->getExpirationAsTTL( $exptime );
if ( apcu_add( $key . self::KEY_SUFFIX, $count, $ttl ) ) {
$result = $count;
break;
}
} elseif ( is_int( $oldCount ) ) {
$count = $oldCount + $step;
if ( apcu_cas( $key . self::KEY_SUFFIX, $oldCount, $count ) ) {
$result = $count;
break;
}
} else {
break;
}
}
}
return $result;
}
}
/** @deprecated class alias since 1.43 */
class_alias( APCUBagOStuff::class, 'APCUBagOStuff' );