e174a4ddfb
Caches for wikis with table prefixes will be lost on upgrade, caches for wikis without table prefixes will be preserved. Custom cache keys in extensions can be migrated at leisure. Extensions which write to core cache keys should be migrated ASAP, as I have done with Special:Makesysop.
127 lines
3.2 KiB
PHP
127 lines
3.2 KiB
PHP
<?php
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/**
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*
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* @package MediaWiki
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* @subpackage Cache
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*/
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/**
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*
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* @package MediaWiki
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*/
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class ParserCache {
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/**
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* Get an instance of this object
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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 object $memCached
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*/
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function ParserCache( &$memCached ) {
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$this->mMemc =& $memCached;
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}
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function getKey( &$article, &$user ) {
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global $action;
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$hash = $user->getPageRenderingHash();
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if( !$article->mTitle->userCanEdit() ) {
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// section edit links are suppressed even if the user has them on
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$edit = '!edit=0';
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} else {
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$edit = '';
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}
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$pageid = intval( $article->getID() );
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$renderkey = (int)($action == 'render');
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$key = wfMemcKey( 'pcache', 'idhash', "$pageid-$renderkey!$hash$edit" );
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return $key;
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}
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function getETag( &$article, &$user ) {
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return 'W/"' . $this->getKey($article, $user) . "--" . $article->mTouched. '"';
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}
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function get( &$article, &$user ) {
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global $wgCacheEpoch;
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$fname = 'ParserCache::get';
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wfProfileIn( $fname );
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$hash = $user->getPageRenderingHash();
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$pageid = intval( $article->getID() );
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$key = $this->getKey( $article, $user );
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wfDebug( "Trying parser cache $key\n" );
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$value = $this->mMemc->get( $key );
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if ( is_object( $value ) ) {
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wfDebug( "Found.\n" );
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# Delete if article has changed since the cache was made
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$canCache = $article->checkTouched();
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$cacheTime = $value->getCacheTime();
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$touched = $article->mTouched;
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if ( !$canCache || $value->expired( $touched ) ) {
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if ( !$canCache ) {
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wfIncrStats( "pcache_miss_invalid" );
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wfDebug( "Invalid cached redirect, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
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} else {
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wfIncrStats( "pcache_miss_expired" );
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wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
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}
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$this->mMemc->delete( $key );
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$value = false;
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} else {
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if ( isset( $value->mTimestamp ) ) {
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$article->mTimestamp = $value->mTimestamp;
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}
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wfIncrStats( "pcache_hit" );
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}
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} else {
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wfDebug( "Parser cache miss.\n" );
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wfIncrStats( "pcache_miss_absent" );
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$value = false;
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}
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wfProfileOut( $fname );
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return $value;
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}
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function save( $parserOutput, &$article, &$user ){
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global $wgParserCacheExpireTime;
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$key = $this->getKey( $article, $user );
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if( $parserOutput->getCacheTime() != -1 ) {
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$now = wfTimestampNow();
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$parserOutput->setCacheTime( $now );
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// Save the timestamp so that we don't have to load the revision row on view
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$parserOutput->mTimestamp = $article->getTimestamp();
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$parserOutput->mText .= "\n<!-- Saved in parser cache with key $key and timestamp $now -->\n";
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wfDebug( "Saved in parser cache with key $key and timestamp $now\n" );
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if( $parserOutput->containsOldMagic() ){
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$expire = 3600; # 1 hour
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} else {
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$expire = $wgParserCacheExpireTime;
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}
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$this->mMemc->set( $key, $parserOutput, $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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?>
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