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<?php
/**
* Observer to detect parser behaviors such as duplicate parses
*
* 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
*
* @since 1.38
*
* @file
* @ingroup Parser
*
* @author Cindy Cicalese
*/
namespace MediaWiki\Parser;
use MediaWiki\Cache\CacheKeyHelper;
use MediaWiki\Content\Content;
use MediaWiki\Page\PageReference;
use MediaWiki\Title\Title;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Wikimedia\MapCacheLRU\MapCacheLRU;
/**
* For observing and detecting parser behaviors, such as duplicate parses
* @internal
* @package MediaWiki\Parser
*/
class ParserObserver {
/**
* @var LoggerInterface
*/
private $logger;
private MapCacheLRU $previousParseStackTraces;
public function __construct( LoggerInterface $logger ) {
$this->logger = $logger;
$this->previousParseStackTraces = new MapCacheLRU( 10 );
}
/**
* @param PageReference $page
* @param int|null $revId
* @param ParserOptions $options
* @param Content $content
* @param ParserOutput $output
*/
public function notifyParse(
PageReference $page, ?int $revId, ParserOptions $options, Content $content, ParserOutput $output
) {
$pageKey = CacheKeyHelper::getKeyForPage( $page );
$optionsHash = $options->optionsHash(
$output->getUsedOptions(),
Title::newFromPageReference( $page )
);
$contentStr = $content->isValid() ? $content->serialize() : null;
// $contentStr may be null if the content could not be serialized
$contentSha1 = $contentStr ? sha1( $contentStr ) : 'INVALID';
$index = $this->getParseId( $pageKey, $revId, $optionsHash, $contentSha1 );
$stackTrace = ( new RuntimeException() )->getTraceAsString();
if ( $this->previousParseStackTraces->has( $index ) ) {
// NOTE: there may be legitimate changes to re-parse the same WikiText content,
// e.g. if predicted revision ID for the REVISIONID magic word mismatched.
// But that should be rare.
$this->logger->debug(
__METHOD__ . ': Possibly redundant parse!',
[
'page' => $pageKey,
'rev' => $revId,
'options-hash' => $optionsHash,
'contentSha1' => $contentSha1,
'trace' => $stackTrace,
'previous-trace' => $this->previousParseStackTraces->get( $index ),
]
);
}
$this->previousParseStackTraces->set( $index, $stackTrace );
}
/**
* @param string $titleStr
* @param int|null $revId
* @param string $optionsHash
* @param string $contentSha1
* @return string
*/
private function getParseId( string $titleStr, ?int $revId, string $optionsHash, string $contentSha1 ): string {
// $revId may be null when previewing a new page
$revIdStr = $revId ?? "";
return "$titleStr.$revIdStr.$optionsHash.$contentSha1";
}
}