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| 1 | <?php |
| 2 | /** |
| 3 | * Object caching using PHP's APCU accelerator. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup Cache |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * This is a wrapper for APCu's shared memory functions |
| 26 | * |
| 27 | * Use PHP serialization to avoid bugs and easily create CAS tokens. |
| 28 | * APCu has a memory corruption bug when the serializer is set to 'default'. |
| 29 | * See T120267, and upstream bug reports: |
| 30 | * - https://github.com/krakjoe/apcu/issues/38 |
| 31 | * - https://github.com/krakjoe/apcu/issues/35 |
| 32 | * - https://github.com/krakjoe/apcu/issues/111 |
| 33 | * |
| 34 | * @ingroup Cache |
| 35 | */ |
| 36 | class APCUBagOStuff extends MediumSpecificBagOStuff { |
| 37 | /** |
| 38 | * @var string String to append to each APC key. This may be changed |
| 39 | * whenever the handling of values is changed, to prevent existing code |
| 40 | * from encountering older values which it cannot handle. |
| 41 | */ |
| 42 | private const KEY_SUFFIX = ':5'; |
| 43 | |
| 44 | /** @var int Max attempts for implicit CAS operations */ |
| 45 | private static $CAS_MAX_ATTEMPTS = 100; |
| 46 | |
| 47 | public function __construct( array $params = [] ) { |
| 48 | // No use in segmenting values |
| 49 | $params['segmentationSize'] = INF; |
| 50 | parent::__construct( $params ); |
| 51 | // Versions of apcu < 5.1.19 use apc.use_request_time=1 by default, causing new keys |
| 52 | // to be assigned timestamps based on the start of the PHP request/script. The longer |
| 53 | // the request has been running, the more likely that newly stored keys will instantly |
| 54 | // be seen as expired by other requests. Disable apc.use_request_time. |
| 55 | ini_set( 'apc.use_request_time', '0' ); |
| 56 | |
| 57 | if ( PHP_SAPI === 'cli' ) { |
| 58 | $this->attrMap[self::ATTR_DURABILITY] = ini_get( 'apc.enable_cli' ) |
| 59 | ? self::QOS_DURABILITY_SCRIPT |
| 60 | : self::QOS_DURABILITY_NONE; |
| 61 | } else { |
| 62 | $this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_SERVICE; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | protected function doGet( $key, $flags = 0, &$casToken = null ) { |
| 67 | $getToken = ( $casToken === self::PASS_BY_REF ); |
| 68 | $casToken = null; |
| 69 | |
| 70 | $value = apcu_fetch( $key . self::KEY_SUFFIX ); |
| 71 | if ( $getToken && $value !== false ) { |
| 72 | // Note that if the driver handles serialization then this uses the PHP value |
| 73 | // as the token. This might require inspection or re-serialization in doCas(). |
| 74 | $casToken = $value; |
| 75 | } |
| 76 | |
| 77 | return $value; |
| 78 | } |
| 79 | |
| 80 | protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) { |
| 81 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 82 | |
| 83 | return apcu_store( $key . self::KEY_SUFFIX, $value, $ttl ); |
| 84 | } |
| 85 | |
| 86 | protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) { |
| 87 | if ( apcu_exists( $key . self::KEY_SUFFIX ) ) { |
| 88 | // Avoid global write locks for high contention keys |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 93 | |
| 94 | return apcu_add( $key . self::KEY_SUFFIX, $value, $ttl ); |
| 95 | } |
| 96 | |
| 97 | protected function doDelete( $key, $flags = 0 ) { |
| 98 | apcu_delete( $key . self::KEY_SUFFIX ); |
| 99 | |
| 100 | return true; |
| 101 | } |
| 102 | |
| 103 | protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) { |
| 104 | // Use apcu 5.1.12 $ttl argument if apcu_inc() will initialize to $init: |
| 105 | // https://www.php.net/manual/en/function.apcu-inc.php |
| 106 | if ( $step === $init ) { |
| 107 | /** @noinspection PhpMethodParametersCountMismatchInspection */ |
| 108 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 109 | $result = apcu_inc( $key . self::KEY_SUFFIX, $step, $success, $ttl ); |
| 110 | } else { |
| 111 | $result = false; |
| 112 | for ( $i = 0; $i < self::$CAS_MAX_ATTEMPTS; ++$i ) { |
| 113 | $oldCount = apcu_fetch( $key . self::KEY_SUFFIX ); |
| 114 | if ( $oldCount === false ) { |
| 115 | $count = $init; |
| 116 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 117 | if ( apcu_add( $key . self::KEY_SUFFIX, $count, $ttl ) ) { |
| 118 | $result = $count; |
| 119 | break; |
| 120 | } |
| 121 | } elseif ( is_int( $oldCount ) ) { |
| 122 | $count = $oldCount + $step; |
| 123 | if ( apcu_cas( $key . self::KEY_SUFFIX, $oldCount, $count ) ) { |
| 124 | $result = $count; |
| 125 | break; |
| 126 | } |
| 127 | } else { |
| 128 | break; |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | return $result; |
| 134 | } |
| 135 | } |