5bae617f0f
Adds MD5 hashing to the generation of keys for WinCache. This fixes the issue of keys (e.g. sub-headings) longer than 150 characters. Bug: T210794 Change-Id: Ieabf6b014a0660198077a23760a05564bf268535
100 lines
2.9 KiB
PHP
100 lines
2.9 KiB
PHP
<?php
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/**
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* Object caching using WinCache.
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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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* Wrapper for WinCache object caching functions; identical interface
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* to the APC wrapper
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*
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* @ingroup Cache
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*/
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class WinCacheBagOStuff extends BagOStuff {
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protected function doGet( $key, $flags = 0 ) {
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$val = wincache_ucache_get( $key );
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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public function set( $key, $value, $expire = 0, $flags = 0 ) {
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$result = wincache_ucache_set( $key, serialize( $value ), $expire );
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/* wincache_ucache_set returns an empty array on success if $value
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* was an array, bool otherwise */
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return ( is_array( $result ) && $result === [] ) || $result;
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}
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public function delete( $key ) {
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wincache_ucache_delete( $key );
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return true;
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}
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public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
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if ( wincache_lock( $key ) ) { // optimize with FIFO lock
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$ok = $this->mergeViaLock( $key, $callback, $exptime, $attempts, $flags );
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wincache_unlock( $key );
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} else {
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$ok = false;
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}
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return $ok;
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}
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/**
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* Construct a cache key.
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*
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* @since 1.27
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* @param string $keyspace
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* @param array $args
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* @return string
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*/
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public function makeKeyInternal( $keyspace, $args ) {
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// WinCache keys have a maximum length of 150 characters. From that,
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// subtract the number of characters we need for the keyspace and for
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// the separator character needed for each argument. To handle some
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// custom prefixes used by thing like WANObjectCache, limit to 125.
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// NOTE: Same as in memcached, except the max key length there is 255.
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$charsLeft = 125 - strlen( $keyspace ) - count( $args );
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$args = array_map(
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function ( $arg ) use ( &$charsLeft ) {
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// 33 = 32 characters for the MD5 + 1 for the '#' prefix.
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if ( $charsLeft > 33 && strlen( $arg ) > $charsLeft ) {
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$arg = '#' . md5( $arg );
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}
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$charsLeft -= strlen( $arg );
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return $arg;
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},
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$args
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);
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if ( $charsLeft < 0 ) {
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return $keyspace . ':BagOStuff-long-key:##' . md5( implode( ':', $args ) );
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}
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return $keyspace . ':' . implode( ':', $args );
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}
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}
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