mirror of
https://github.com/YunoHost-Apps/mediawiki_ynh.git
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260 lines
8.1 KiB
PHP
260 lines
8.1 KiB
PHP
<?php
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/**
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* Cache for outputs of the PHP parser
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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 Parser
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*/
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/**
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* @ingroup Cache Parser
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* @todo document
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*/
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class ParserCache {
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private $mMemc;
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const try116cache = false; /* Only useful $wgParserCacheExpireTime after updating to 1.17 */
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/**
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* Get an instance of this object
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*
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* @return ParserCache
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*/
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public static function singleton() {
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static $instance;
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if ( !isset( $instance ) ) {
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global $parserMemc;
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$instance = new ParserCache( $parserMemc );
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}
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return $instance;
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}
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/**
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* Setup a cache pathway with a given back-end storage mechanism.
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* May be a memcached client or a BagOStuff derivative.
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*
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* @param $memCached Object
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* @throws MWException
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*/
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protected function __construct( $memCached ) {
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if ( !$memCached ) {
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throw new MWException( "Tried to create a ParserCache with an invalid memcached" );
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}
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$this->mMemc = $memCached;
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}
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/**
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* @param $article Article
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* @param $hash string
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* @return mixed|string
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*/
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protected function getParserOutputKey( $article, $hash ) {
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global $wgRequest;
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// idhash seem to mean 'page id' + 'rendering hash' (r3710)
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$pageid = $article->getID();
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$renderkey = (int)( $wgRequest->getVal( 'action' ) == 'render' );
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$key = wfMemcKey( 'pcache', 'idhash', "{$pageid}-{$renderkey}!{$hash}" );
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return $key;
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}
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/**
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* @param $article Article
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* @return mixed|string
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*/
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protected function getOptionsKey( $article ) {
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$pageid = $article->getID();
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return wfMemcKey( 'pcache', 'idoptions', "{$pageid}" );
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}
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/**
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* Provides an E-Tag suitable for the whole page. Note that $article
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* is just the main wikitext. The E-Tag has to be unique to the whole
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* page, even if the article itself is the same, so it uses the
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* complete set of user options. We don't want to use the preference
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* of a different user on a message just because it wasn't used in
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* $article. For example give a Chinese interface to a user with
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* English preferences. That's why we take into account *all* user
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* options. (r70809 CR)
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*
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* @param $article Article
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* @param $popts ParserOptions
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* @return string
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*/
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function getETag( $article, $popts ) {
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return 'W/"' . $this->getParserOutputKey( $article,
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$popts->optionsHash( ParserOptions::legacyOptions(), $article->getTitle() ) ) .
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"--" . $article->getTouched() . '"';
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}
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/**
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* Retrieve the ParserOutput from ParserCache, even if it's outdated.
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* @param $article Article
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* @param $popts ParserOptions
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* @return ParserOutput|bool False on failure
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*/
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public function getDirty( $article, $popts ) {
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$value = $this->get( $article, $popts, true );
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return is_object( $value ) ? $value : false;
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}
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/**
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* Used to provide a unique id for the PoolCounter.
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* It would be preferable to have this code in get()
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* instead of having Article looking in our internals.
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*
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* @todo Document parameter $useOutdated
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*
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* @param $article Article
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* @param $popts ParserOptions
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* @param $useOutdated Boolean (default true)
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* @return bool|mixed|string
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*/
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public function getKey( $article, $popts, $useOutdated = true ) {
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global $wgCacheEpoch;
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if ( $popts instanceof User ) {
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wfWarn( "Use of outdated prototype ParserCache::getKey( &\$article, &\$user )\n" );
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$popts = ParserOptions::newFromUser( $popts );
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}
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// Determine the options which affect this article
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$optionsKey = $this->mMemc->get( $this->getOptionsKey( $article ) );
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if ( $optionsKey != false ) {
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if ( !$useOutdated && $optionsKey->expired( $article->getTouched() ) ) {
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wfIncrStats( "pcache_miss_expired" );
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$cacheTime = $optionsKey->getCacheTime();
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wfDebug( "Parser options key expired, touched " . $article->getTouched() . ", epoch $wgCacheEpoch, cached $cacheTime\n" );
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return false;
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}
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$usedOptions = $optionsKey->mUsedOptions;
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wfDebug( "Parser cache options found.\n" );
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} else {
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if ( !$useOutdated && !self::try116cache ) {
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return false;
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}
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$usedOptions = ParserOptions::legacyOptions();
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}
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return $this->getParserOutputKey( $article, $popts->optionsHash( $usedOptions, $article->getTitle() ) );
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}
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/**
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* Retrieve the ParserOutput from ParserCache.
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* false if not found or outdated.
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*
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* @param $article Article
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* @param $popts ParserOptions
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* @param $useOutdated Boolean (default false)
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*
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* @return ParserOutput|bool False on failure
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*/
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public function get( $article, $popts, $useOutdated = false ) {
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global $wgCacheEpoch;
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wfProfileIn( __METHOD__ );
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$canCache = $article->checkTouched();
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if ( !$canCache ) {
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// It's a redirect now
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wfProfileOut( __METHOD__ );
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return false;
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}
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$touched = $article->getTouched();
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$parserOutputKey = $this->getKey( $article, $popts, $useOutdated );
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if ( $parserOutputKey === false ) {
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wfIncrStats( 'pcache_miss_absent' );
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wfProfileOut( __METHOD__ );
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return false;
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}
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$value = $this->mMemc->get( $parserOutputKey );
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if ( self::try116cache && !$value && strpos( $value, '*' ) !== -1 ) {
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wfDebug( "New format parser cache miss.\n" );
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$parserOutputKey = $this->getParserOutputKey( $article,
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$popts->optionsHash( ParserOptions::legacyOptions(), $article->getTitle() ) );
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$value = $this->mMemc->get( $parserOutputKey );
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}
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if ( !$value ) {
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wfDebug( "ParserOutput cache miss.\n" );
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wfIncrStats( "pcache_miss_absent" );
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wfProfileOut( __METHOD__ );
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return false;
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}
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wfDebug( "ParserOutput cache found.\n" );
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// The edit section preference may not be the appropiate one in
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// the ParserOutput, as we are not storing it in the parsercache
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// key. Force it here. See bug 31445.
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$value->setEditSectionTokens( $popts->getEditSection() );
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if ( !$useOutdated && $value->expired( $touched ) ) {
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wfIncrStats( "pcache_miss_expired" );
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$cacheTime = $value->getCacheTime();
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wfDebug( "ParserOutput key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
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$value = false;
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} else {
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wfIncrStats( "pcache_hit" );
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}
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wfProfileOut( __METHOD__ );
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return $value;
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}
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/**
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* @param $parserOutput ParserOutput
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* @param $article Article
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* @param $popts ParserOptions
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* @param $cacheTime Time when the cache was generated
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*/
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public function save( $parserOutput, $article, $popts, $cacheTime = null ) {
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$expire = $parserOutput->getCacheExpiry();
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if ( $expire > 0 ) {
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$cacheTime = $cacheTime ?: wfTimestampNow();
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$optionsKey = new CacheTime;
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$optionsKey->mUsedOptions = $parserOutput->getUsedOptions();
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$optionsKey->updateCacheExpiry( $expire );
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$optionsKey->setCacheTime( $cacheTime );
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$parserOutput->setCacheTime( $cacheTime );
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$optionsKey->setContainsOldMagic( $parserOutput->containsOldMagic() );
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$parserOutputKey = $this->getParserOutputKey( $article,
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$popts->optionsHash( $optionsKey->mUsedOptions, $article->getTitle() ) );
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// Save the timestamp so that we don't have to load the revision row on view
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$parserOutput->setTimestamp( $article->getTimestamp() );
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$parserOutput->mText .= "\n<!-- Saved in parser cache with key $parserOutputKey and timestamp $cacheTime\n -->\n";
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wfDebug( "Saved in parser cache with key $parserOutputKey and timestamp $cacheTime\n" );
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// Save the parser output
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$this->mMemc->set( $parserOutputKey, $parserOutput, $expire );
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// ...and its pointer
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$this->mMemc->set( $this->getOptionsKey( $article ), $optionsKey, $expire );
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} else {
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wfDebug( "Parser output was marked as uncacheable and has not been saved.\n" );
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}
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}
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}
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