118 lines
3.4 KiB
PHP
118 lines
3.4 KiB
PHP
<?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 MapCacheLRU;
|
|
use MediaWiki\Cache\CacheKeyHelper;
|
|
use MediaWiki\Content\Content;
|
|
use MediaWiki\Page\PageReference;
|
|
use MediaWiki\Title\Title;
|
|
use Psr\Log\LoggerInterface;
|
|
use RuntimeException;
|
|
|
|
/**
|
|
* For observing and detecting parser behaviors, such as duplicate parses
|
|
* @internal
|
|
* @package MediaWiki\Parser
|
|
*/
|
|
class ParserObserver {
|
|
/**
|
|
* @var LoggerInterface
|
|
*/
|
|
private $logger;
|
|
|
|
private MapCacheLRU $previousParseStackTraces;
|
|
|
|
/**
|
|
* @param LoggerInterface $logger
|
|
*/
|
|
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";
|
|
}
|
|
|
|
}
|