includes/poolcounter/PoolWorkArticleView.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20 use MediaWiki\MediaWikiServices;
  21
  22 class PoolWorkArticleView extends PoolCounterWork {
  23         /** @var WikiPage */
  24         private $page;
  25
  26         /** @var string */
  27         private $cacheKey;
  28
  29         /** @var int */
  30         private $revid;
  31
  32         /** @var ParserCache */
  33         private $parserCache;
  34
  35         /** @var ParserOptions */
  36         private $parserOptions;
  37
  38         /** @var Content|null */
  39         private $content = null;
  40
  41         /** @var ParserOutput|bool */
  42         private $parserOutput = false;
  43
  44         /** @var bool */
  45         private $isDirty = false;
  46
  47         /** @var Status|bool */
  48         private $error = false;
  49
  50         /**
  51          * @param WikiPage $page
  52          * @param ParserOptions $parserOptions ParserOptions to use for the parse
  53          * @param int $revid ID of the revision being parsed.
  54          * @param bool $useParserCache Whether to use the parser cache.
  55          *   operation.
  56          * @param Content|string $content Content to parse or null to load it; may
  57          *   also be given as a wikitext string, for BC.
  58          */
  59         public function __construct( WikiPage $page, ParserOptions $parserOptions,
  60                 $revid, $useParserCache, $content = null
  61         ) {
  62                 if ( is_string( $content ) ) { // BC: old style call
  63                         $modelId = $page->getRevision()->getContentModel();
  64                         $format = $page->getRevision()->getContentFormat();
  65                         $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
  66                 }
  67
  68                 $this->page = $page;
  69                 $this->revid = $revid;
  70                 $this->cacheable = $useParserCache;
  71                 $this->parserOptions = $parserOptions;
  72                 $this->content = $content;
  73                 $this->parserCache = MediaWikiServices::getInstance()->getParserCache();
  74                 $this->cacheKey = $this->parserCache->getKey( $page, $parserOptions );
  75                 $keyPrefix = $this->cacheKey ?: wfMemcKey( 'articleview', 'missingcachekey' );
  76                 parent::__construct( 'ArticleView', $keyPrefix . ':revid:' . $revid );
  77         }
  78
  79         /**
  80          * Get the ParserOutput from this object, or false in case of failure
  81          *
  82          * @return ParserOutput
  83          */
  84         public function getParserOutput() {
  85                 return $this->parserOutput;
  86         }
  87
  88         /**
  89          * Get whether the ParserOutput is a dirty one (i.e. expired)
  90          *
  91          * @return bool
  92          */
  93         public function getIsDirty() {
  94                 return $this->isDirty;
  95         }
  96
  97         /**
  98          * Get a Status object in case of error or false otherwise
  99          *
 100          * @return Status|bool
 101          */
 102         public function getError() {
 103                 return $this->error;
 104         }
 105
 106         /**
 107          * @return bool
 108          */
 109         public function doWork() {
 110                 global $wgUseFileCache;
 111
 112                 // @todo several of the methods called on $this->page are not declared in Page, but present
 113                 //        in WikiPage and delegated by Article.
 114
 115                 $isCurrent = $this->revid === $this->page->getLatest();
 116
 117                 if ( $this->content !== null ) {
 118                         $content = $this->content;
 119                 } elseif ( $isCurrent ) {
 120                         // XXX: why use RAW audience here, and PUBLIC (default) below?
 121                         $content = $this->page->getContent( Revision::RAW );
 122                 } else {
 123                         $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
 124
 125                         if ( $rev === null ) {
 126                                 $content = null;
 127                         } else {
 128                                 // XXX: why use PUBLIC audience here (default), and RAW above?
 129                                 $content = $rev->getContent();
 130                         }
 131                 }
 132
 133                 if ( $content === null ) {
 134                         return false;
 135                 }
 136
 137                 // Reduce effects of race conditions for slow parses (T48014)
 138                 $cacheTime = wfTimestampNow();
 139
 140                 $time = - microtime( true );
 141                 $this->parserOutput = $content->getParserOutput(
 142                         $this->page->getTitle(),
 143                         $this->revid,
 144                         $this->parserOptions
 145                 );
 146                 $time += microtime( true );
 147
 148                 // Timing hack
 149                 if ( $time > 3 ) {
 150                         // TODO: Use Parser's logger (once it has one)
 151                         $logger = MediaWiki\Logger\LoggerFactory::getInstance( 'slow-parse' );
 152                         $logger->info( '{time} {title}', [
 153                                 'time' => number_format( $time, 2 ),
 154                                 'title' => $this->page->getTitle()->getPrefixedDBkey(),
 155                                 'ns' => $this->page->getTitle()->getNamespace(),
 156                                 'trigger' => 'view',
 157                         ] );
 158                 }
 159
 160                 if ( $this->cacheable && $this->parserOutput->isCacheable() && $isCurrent ) {
 161                         $this->parserCache->save(
 162                                 $this->parserOutput, $this->page, $this->parserOptions, $cacheTime, $this->revid );
 163                 }
 164
 165                 // Make sure file cache is not used on uncacheable content.
 166                 // Output that has magic words in it can still use the parser cache
 167                 // (if enabled), though it will generally expire sooner.
 168                 if ( !$this->parserOutput->isCacheable() ) {
 169                         $wgUseFileCache = false;
 170                 }
 171
 172                 if ( $isCurrent ) {
 173                         $this->page->triggerOpportunisticLinksUpdate( $this->parserOutput );
 174                 }
 175
 176                 return true;
 177         }
 178
 179         /**
 180          * @return bool
 181          */
 182         public function getCachedWork() {
 183                 $this->parserOutput = $this->parserCache->get( $this->page, $this->parserOptions );
 184
 185                 if ( $this->parserOutput === false ) {
 186                         wfDebug( __METHOD__ . ": parser cache miss\n" );
 187                         return false;
 188                 } else {
 189                         wfDebug( __METHOD__ . ": parser cache hit\n" );
 190                         return true;
 191                 }
 192         }
 193
 194         /**
 195          * @return bool
 196          */
 197         public function fallback() {
 198                 $this->parserOutput = $this->parserCache->getDirty( $this->page, $this->parserOptions );
 199
 200                 if ( $this->parserOutput === false ) {
 201                         wfDebugLog( 'dirty', 'dirty missing' );
 202                         wfDebug( __METHOD__ . ": no dirty cache\n" );
 203                         return false;
 204                 } else {
 205                         wfDebug( __METHOD__ . ": sending dirty output\n" );
 206                         wfDebugLog( 'dirty', "dirty output {$this->cacheKey}" );
 207                         $this->isDirty = true;
 208                         return true;
 209                 }
 210         }
 211
 212         /**
 213          * @param Status $status
 214          * @return bool
 215          */
 216         public function error( $status ) {
 217                 $this->error = $status;
 218                 return false;
 219         }
 220 }