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