includes/Wiki.php

   1 <?php
   2 /**
   3  * Helper class for the index.php entry point.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * The MediaWiki class is the helper class for the index.php entry point.
  25  *
  26  * @internal documentation reviewed 15 Mar 2010
  27  */
  28 class MediaWiki {
  29
  30         /**
  31          * TODO: fold $output, etc, into this
  32          * @var IContextSource
  33          */
  34         private $context;
  35
  36         /**
  37          * @param $x null|WebRequest
  38          * @return WebRequest
  39          */
  40         public function request( WebRequest $x = null ) {
  41                 $old = $this->context->getRequest();
  42                 $this->context->setRequest( $x );
  43                 return $old;
  44         }
  45
  46         /**
  47          * @param $x null|OutputPage
  48          * @return OutputPage
  49          */
  50         public function output( OutputPage $x = null ) {
  51                 $old = $this->context->getOutput();
  52                 $this->context->setOutput( $x );
  53                 return $old;
  54         }
  55
  56         /**
  57          * @param IContextSource|null $context
  58          */
  59         public function __construct( IContextSource $context = null ) {
  60                 if ( !$context ) {
  61                         $context = RequestContext::getMain();
  62                 }
  63
  64                 $this->context = $context;
  65         }
  66
  67         /**
  68          * Parse the request to get the Title object
  69          *
  70          * @return Title object to be $wgTitle
  71          */
  72         private function parseTitle() {
  73                 global $wgContLang;
  74
  75                 $request = $this->context->getRequest();
  76                 $curid = $request->getInt( 'curid' );
  77                 $title = $request->getVal( 'title' );
  78                 $action = $request->getVal( 'action', 'view' );
  79
  80                 if ( $request->getCheck( 'search' ) ) {
  81                         // Compatibility with old search URLs which didn't use Special:Search
  82                         // Just check for presence here, so blank requests still
  83                         // show the search page when using ugly URLs (bug 8054).
  84                         $ret = SpecialPage::getTitleFor( 'Search' );
  85                 } elseif ( $curid ) {
  86                         // URLs like this are generated by RC, because rc_title isn't always accurate
  87                         $ret = Title::newFromID( $curid );
  88                 } else {
  89                         $ret = Title::newFromURL( $title );
  90                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  91                         // in wikitext links to tell Parser to make a direct file link
  92                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  93                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  94                         }
  95                         // Check variant links so that interwiki links don't have to worry
  96                         // about the possible different language variants
  97                         if ( count( $wgContLang->getVariants() ) > 1
  98                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  99                         ) {
 100                                 $wgContLang->findVariantLink( $title, $ret );
 101                         }
 102                 }
 103
 104                 // If title is not provided, always allow oldid and diff to set the title.
 105                 // If title is provided, allow oldid and diff to override the title, unless
 106                 // we are talking about a special page which might use these parameters for
 107                 // other purposes.
 108                 if ( $ret === null || !$ret->isSpecialPage() ) {
 109                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 110                         $oldid = $request->getInt( 'oldid' );
 111                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 112                         // Allow oldid to override a changed or missing title
 113                         if ( $oldid ) {
 114                                 $rev = Revision::newFromId( $oldid );
 115                                 $ret = $rev ? $rev->getTitle() : $ret;
 116                         }
 117                 }
 118
 119                 // Use the main page as default title if nothing else has been provided
 120                 if ( $ret === null && strval( $title ) === '' && !$request->getCheck( 'curid' ) && $action !== 'delete' ) {
 121                         $ret = Title::newMainPage();
 122                 }
 123
 124                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 125                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 126                 }
 127
 128                 return $ret;
 129         }
 130
 131         /**
 132          * Get the Title object that we'll be acting on, as specified in the WebRequest
 133          * @return Title
 134          */
 135         public function getTitle() {
 136                 if ( $this->context->getTitle() === null ) {
 137                         $this->context->setTitle( $this->parseTitle() );
 138                 }
 139                 return $this->context->getTitle();
 140         }
 141
 142         /**
 143          * Returns the name of the action that will be executed.
 144          *
 145          * @return string: action
 146          */
 147         public function getAction() {
 148                 static $action = null;
 149
 150                 if ( $action === null ) {
 151                         $action = Action::getActionName( $this->context );
 152                 }
 153
 154                 return $action;
 155         }
 156
 157         /**
 158          * Performs the request.
 159          * - bad titles
 160          * - read restriction
 161          * - local interwiki redirects
 162          * - redirect loop
 163          * - special pages
 164          * - normal pages
 165          *
 166          * @throws MWException|PermissionsError|BadTitleError|HttpError
 167          * @return void
 168          */
 169         private function performRequest() {
 170                 global $wgServer, $wgUsePathInfo, $wgTitle;
 171
 172                 wfProfileIn( __METHOD__ );
 173
 174                 $request = $this->context->getRequest();
 175                 $requestTitle = $title = $this->context->getTitle();
 176                 $output = $this->context->getOutput();
 177                 $user = $this->context->getUser();
 178
 179                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 180                         $output->setPrintable();
 181                 }
 182
 183                 $unused = null; // To pass it by reference
 184                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 185
 186                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 187                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 188                         || $title->isSpecial( 'Badtitle' )
 189                 ) {
 190                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 191                         wfProfileOut( __METHOD__ );
 192                         throw new BadTitleError();
 193                 }
 194
 195                 // Check user's permissions to read this page.
 196                 // We have to check here to catch special pages etc.
 197                 // We will check again in Article::view().
 198                 $permErrors = $title->getUserPermissionsErrors( 'read', $user );
 199                 if ( count( $permErrors ) ) {
 200                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 201                         // $this->context->title set to the input title would allow anonymous users to
 202                         // determine whether a page exists, potentially leaking private data. In fact, the
 203                         // curid and oldid request  parameters would allow page titles to be enumerated even
 204                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 205                         // permissions error is displayed.
 206                         //
 207                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 208                         // still use $wgTitle.
 209
 210                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 211                         $this->context->setTitle( $badTitle );
 212                         $wgTitle = $badTitle;
 213
 214                         wfProfileOut( __METHOD__ );
 215                         throw new PermissionsError( 'read', $permErrors );
 216                 }
 217
 218                 $pageView = false; // was an article or special page viewed?
 219
 220                 // Interwiki redirects
 221                 if ( $title->isExternal() ) {
 222                         $rdfrom = $request->getVal( 'rdfrom' );
 223                         if ( $rdfrom ) {
 224                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 225                         } else {
 226                                 $query = $request->getValues();
 227                                 unset( $query['title'] );
 228                                 $url = $title->getFullURL( $query );
 229                         }
 230                         // Check for a redirect loop
 231                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 232                                 && $title->isLocal()
 233                         ) {
 234                                 // 301 so google et al report the target as the actual url.
 235                                 $output->redirect( $url, 301 );
 236                         } else {
 237                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 238                                 wfProfileOut( __METHOD__ );
 239                                 throw new BadTitleError();
 240                         }
 241                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 242                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 243                         && ( $request->getVal( 'title' ) === null
 244                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 245                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 246                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 247                 ) {
 248                         if ( $title->isSpecialPage() ) {
 249                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 250                                 if ( $name ) {
 251                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 252                                 }
 253                         }
 254                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 255                         // Redirect to canonical url, make it a 301 to allow caching
 256                         if ( $targetUrl == $request->getFullRequestURL() ) {
 257                                 $message = "Redirect loop detected!\n\n" .
 258                                         "This means the wiki got confused about what page was " .
 259                                         "requested; this sometimes happens when moving a wiki " .
 260                                         "to a new server or changing the server configuration.\n\n";
 261
 262                                 if ( $wgUsePathInfo ) {
 263                                         $message .= "The wiki is trying to interpret the page " .
 264                                                 "title from the URL path portion (PATH_INFO), which " .
 265                                                 "sometimes fails depending on the web server. Try " .
 266                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 267                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 268                                                 "is correct.";
 269                                 } else {
 270                                         $message .= "Your web server was detected as possibly not " .
 271                                                 "supporting URL path components (PATH_INFO) correctly; " .
 272                                                 "check your LocalSettings.php for a customized " .
 273                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 274                                                 "to true.";
 275                                 }
 276                                 throw new HttpError( 500, $message );
 277                         } else {
 278                                 $output->setSquidMaxage( 1200 );
 279                                 $output->redirect( $targetUrl, '301' );
 280                         }
 281                 // Special pages
 282                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 283                         $pageView = true;
 284                         // Actions that need to be made when we have a special pages
 285                         SpecialPageFactory::executePath( $title, $this->context );
 286                 } else {
 287                         // ...otherwise treat it as an article view. The article
 288                         // may be a redirect to another article or URL.
 289                         $article = $this->initializeArticle();
 290                         if ( is_object( $article ) ) {
 291                                 $pageView = true;
 292                                 $this->performAction( $article, $requestTitle );
 293                         } elseif ( is_string( $article ) ) {
 294                                 $output->redirect( $article );
 295                         } else {
 296                                 wfProfileOut( __METHOD__ );
 297                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 298                                         . " returned neither an object nor a URL" );
 299                         }
 300                 }
 301
 302                 if ( $pageView ) {
 303                         // Promote user to any groups they meet the criteria for
 304                         $user->addAutopromoteOnceGroups( 'onView' );
 305                 }
 306
 307                 wfProfileOut( __METHOD__ );
 308         }
 309
 310         /**
 311          * Initialize the main Article object for "standard" actions (view, etc)
 312          * Create an Article object for the page, following redirects if needed.
 313          *
 314          * @return mixed an Article, or a string to redirect to another URL
 315          */
 316         private function initializeArticle() {
 317                 global $wgDisableHardRedirects;
 318
 319                 wfProfileIn( __METHOD__ );
 320
 321                 $title = $this->context->getTitle();
 322                 if ( $this->context->canUseWikiPage() ) {
 323                         // Try to use request context wiki page, as there
 324                         // is already data from db saved in per process
 325                         // cache there from this->getAction() call.
 326                         $page = $this->context->getWikiPage();
 327                         $article = Article::newFromWikiPage( $page, $this->context );
 328                 } else {
 329                         // This case should not happen, but just in case.
 330                         $article = Article::newFromTitle( $title, $this->context );
 331                         $this->context->setWikiPage( $article->getPage() );
 332                 }
 333
 334                 // NS_MEDIAWIKI has no redirects.
 335                 // It is also used for CSS/JS, so performance matters here...
 336                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 337                         wfProfileOut( __METHOD__ );
 338                         return $article;
 339                 }
 340
 341                 $request = $this->context->getRequest();
 342
 343                 // Namespace might change when using redirects
 344                 // Check for redirects ...
 345                 $action = $request->getVal( 'action', 'view' );
 346                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 347                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 348                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 349                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 350                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 351                         // ... and the article is not a non-redirect image page with associated file
 352                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 353                 ) {
 354                         // Give extensions a change to ignore/handle redirects as needed
 355                         $ignoreRedirect = $target = false;
 356
 357                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 358                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 359
 360                         // Follow redirects only for... redirects.
 361                         // If $target is set, then a hook wanted to redirect.
 362                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 363                                 // Is the target already set by an extension?
 364                                 $target = $target ? $target : $article->followRedirect();
 365                                 if ( is_string( $target ) ) {
 366                                         if ( !$wgDisableHardRedirects ) {
 367                                                 // we'll need to redirect
 368                                                 wfProfileOut( __METHOD__ );
 369                                                 return $target;
 370                                         }
 371                                 }
 372                                 if ( is_object( $target ) ) {
 373                                         // Rewrite environment to redirected article
 374                                         $rarticle = Article::newFromTitle( $target, $this->context );
 375                                         $rarticle->loadPageData();
 376                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 377                                                 $rarticle->setRedirectedFrom( $title );
 378                                                 $article = $rarticle;
 379                                                 $this->context->setTitle( $target );
 380                                                 $this->context->setWikiPage( $article->getPage() );
 381                                         }
 382                                 }
 383                         } else {
 384                                 $this->context->setTitle( $article->getTitle() );
 385                                 $this->context->setWikiPage( $article->getPage() );
 386                         }
 387                 }
 388
 389                 wfProfileOut( __METHOD__ );
 390                 return $article;
 391         }
 392
 393         /**
 394          * Perform one of the "standard" actions
 395          *
 396          * @param $page Page
 397          * @param $requestTitle The original title, before any redirects were applied
 398          */
 399         private function performAction( Page $page, Title $requestTitle ) {
 400                 global $wgUseSquid, $wgSquidMaxage;
 401
 402                 wfProfileIn( __METHOD__ );
 403
 404                 $request = $this->context->getRequest();
 405                 $output = $this->context->getOutput();
 406                 $title = $this->context->getTitle();
 407                 $user = $this->context->getUser();
 408
 409                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 410                                 array( $output, $page, $title, $user, $request, $this ) )
 411                 ) {
 412                         wfProfileOut( __METHOD__ );
 413                         return;
 414                 }
 415
 416                 $act = $this->getAction();
 417
 418                 $action = Action::factory( $act, $page, $this->context );
 419
 420                 if ( $action instanceof Action ) {
 421                         # Let Squid cache things if we can purge them.
 422                         if ( $wgUseSquid &&
 423                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 424                         ) {
 425                                 $output->setSquidMaxage( $wgSquidMaxage );
 426                         }
 427
 428                         $action->show();
 429                         wfProfileOut( __METHOD__ );
 430                         return;
 431                 }
 432
 433                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 434                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 435                 }
 436
 437                 wfProfileOut( __METHOD__ );
 438         }
 439
 440         /**
 441          * Run the current MediaWiki instance
 442          * index.php just calls this
 443          */
 444         public function run() {
 445                 try {
 446                         $this->checkMaxLag();
 447                         $this->main();
 448                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 449                                 fastcgi_finish_request();
 450                         }
 451                         $this->restInPeace();
 452                 } catch ( Exception $e ) {
 453                         MWExceptionHandler::handle( $e );
 454                 }
 455         }
 456
 457         /**
 458          * Checks if the request should abort due to a lagged server,
 459          * for given maxlag parameter.
 460          * @return bool
 461          */
 462         private function checkMaxLag() {
 463                 global $wgShowHostnames;
 464
 465                 wfProfileIn( __METHOD__ );
 466                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 467                 if ( !is_null( $maxLag ) ) {
 468                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 469                         if ( $lag > $maxLag ) {
 470                                 $resp = $this->context->getRequest()->response();
 471                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 472                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 473                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 474                                 $resp->header( 'Content-Type: text/plain' );
 475                                 if ( $wgShowHostnames ) {
 476                                         echo "Waiting for $host: $lag seconds lagged\n";
 477                                 } else {
 478                                         echo "Waiting for a database server: $lag seconds lagged\n";
 479                                 }
 480
 481                                 wfProfileOut( __METHOD__ );
 482
 483                                 exit;
 484                         }
 485                 }
 486                 wfProfileOut( __METHOD__ );
 487                 return true;
 488         }
 489
 490         private function main() {
 491                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 492
 493                 wfProfileIn( __METHOD__ );
 494
 495                 $request = $this->context->getRequest();
 496
 497                 // Send Ajax requests to the Ajax dispatcher.
 498                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 499
 500                         // Set a dummy title, because $wgTitle == null might break things
 501                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 502                         $this->context->setTitle( $title );
 503                         $wgTitle = $title;
 504
 505                         $dispatcher = new AjaxDispatcher();
 506                         $dispatcher->performAction();
 507                         wfProfileOut( __METHOD__ );
 508                         return;
 509                 }
 510
 511                 // Get title from request parameters,
 512                 // is set on the fly by parseTitle the first time.
 513                 $title = $this->getTitle();
 514                 $action = $this->getAction();
 515                 $wgTitle = $title;
 516
 517                 // If the user has forceHTTPS set to true, or if the user
 518                 // is in a group requiring HTTPS, or if they have the HTTPS
 519                 // preference set, redirect them to HTTPS.
 520                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 521                 // isLoggedIn() will do all sorts of weird stuff.
 522                 if (
 523                         (
 524                                 $request->getCookie( 'forceHTTPS', '' ) ||
 525                                 // check for prefixed version for currently logged in users
 526                                 $request->getCookie( 'forceHTTPS' ) ||
 527                                 // Avoid checking the user and groups unless it's enabled.
 528                                 (
 529                                         $this->context->getUser()->isLoggedIn()
 530                                         && $this->context->getUser()->requiresHTTPS()
 531                                 )
 532                         ) &&
 533                         $request->getProtocol() == 'http'
 534                 ) {
 535                         $oldUrl = $request->getFullRequestURL();
 536                         $redirUrl = str_replace( 'http://', 'https://', $oldUrl );
 537
 538                         if ( $request->wasPosted() ) {
 539                                 // This is weird and we'd hope it almost never happens. This
 540                                 // means that a POST came in via HTTP and policy requires us
 541                                 // redirecting to HTTPS. It's likely such a request is going
 542                                 // to fail due to post data being lost, but let's try anyway
 543                                 // and just log the instance.
 544                                 //
 545                                 // @todo @fixme See if we could issue a 307 or 308 here, need
 546                                 // to see how clients (automated & browser) behave when we do
 547                                 wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 548                         }
 549
 550                         // Setup dummy Title, otherwise OutputPage::redirect will fail
 551                         $title = Title::newFromText( NS_MAIN, 'REDIR' );
 552                         $this->context->setTitle( $title );
 553                         $output = $this->context->getOutput();
 554                         // Since we only do this redir to change proto, always send a vary header
 555                         $output->addVaryHeader( 'X-Forwarded-Proto' );
 556                         $output->redirect( $redirUrl );
 557                         $output->output();
 558                         wfProfileOut( __METHOD__ );
 559                         return;
 560                 }
 561
 562                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 563                         wfProfileIn( 'main-try-filecache' );
 564                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 565                                 // Try low-level file cache hit
 566                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 567                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 568                                         // Check incoming headers to see if client has this cached
 569                                         $timestamp = $cache->cacheTimestamp();
 570                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 571                                                 $cache->loadFromFileCache( $this->context );
 572                                         }
 573                                         // Do any stats increment/watchlist stuff
 574                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 575                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 576                                         // Tell OutputPage that output is taken care of
 577                                         $this->context->getOutput()->disable();
 578                                         wfProfileOut( 'main-try-filecache' );
 579                                         wfProfileOut( __METHOD__ );
 580                                         return;
 581                                 }
 582                         }
 583                         wfProfileOut( 'main-try-filecache' );
 584                 }
 585
 586                 $this->performRequest();
 587
 588                 // Now commit any transactions, so that unreported errors after
 589                 // output() don't roll back the whole DB transaction
 590                 wfGetLBFactory()->commitMasterChanges();
 591
 592                 // Output everything!
 593                 $this->context->getOutput()->output();
 594
 595                 wfProfileOut( __METHOD__ );
 596         }
 597
 598         /**
 599          * Ends this task peacefully
 600          */
 601         public function restInPeace() {
 602                 // Do any deferred jobs
 603                 DeferredUpdates::doUpdates( 'commit' );
 604
 605                 // Execute a job from the queue
 606                 $this->doJobs();
 607
 608                 // Log profiling data, e.g. in the database or UDP
 609                 wfLogProfilingData();
 610
 611                 // Commit and close up!
 612                 $factory = wfGetLBFactory();
 613                 $factory->commitMasterChanges();
 614                 $factory->shutdown();
 615
 616                 wfDebug( "Request ended normally\n" );
 617         }
 618
 619         /**
 620          * Do a job from the job queue
 621          */
 622         private function doJobs() {
 623                 global $wgJobRunRate, $wgPhpCli, $IP;
 624
 625                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 626                         return;
 627                 }
 628
 629                 if ( $wgJobRunRate < 1 ) {
 630                         $max = mt_getrandmax();
 631                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 632                                 return; // the higher $wgJobRunRate, the less likely we return here
 633                         }
 634                         $n = 1;
 635                 } else {
 636                         $n = intval( $wgJobRunRate );
 637                 }
 638
 639                 if ( !wfShellExecDisabled() && is_executable( $wgPhpCli ) ) {
 640                         // Start a background process to run some of the jobs
 641                         wfProfileIn( __METHOD__ . '-exec' );
 642                         $retVal = 1;
 643                         $cmd = wfShellWikiCmd( "$IP/maintenance/runJobs.php", array( '--maxjobs', $n ) );
 644                         $cmd .= " >" . wfGetNull() . " 2>&1"; // don't hang PHP on pipes
 645                         if ( wfIsWindows() ) {
 646                                 // Using START makes this async and also works around a bug where using
 647                                 // wfShellExec() with a quoted script name causes a filename syntax error.
 648                                 $cmd = "START /B \"bg\" $cmd";
 649                         } else {
 650                                 $cmd = "$cmd &";
 651                         }
 652                         wfShellExec( $cmd, $retVal );
 653                         wfProfileOut( __METHOD__ . '-exec' );
 654                 } else {
 655                         try {
 656                                 // Fallback to running the jobs here while the user waits
 657                                 $group = JobQueueGroup::singleton();
 658                                 do {
 659                                         $job = $group->pop( JobQueueGroup::USE_CACHE ); // job from any queue
 660                                         if ( $job ) {
 661                                                 $output = $job->toString() . "\n";
 662                                                 $t = - microtime( true );
 663                                                 wfProfileIn( __METHOD__ . '-' . get_class( $job ) );
 664                                                 $success = $job->run();
 665                                                 wfProfileOut( __METHOD__ . '-' . get_class( $job ) );
 666                                                 $group->ack( $job ); // done
 667                                                 $t += microtime( true );
 668                                                 $t = round( $t * 1000 );
 669                                                 if ( $success === false ) {
 670                                                         $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 671                                                 } else {
 672                                                         $output .= "Success, Time: $t ms\n";
 673                                                 }
 674                                                 wfDebugLog( 'jobqueue', $output );
 675                                         }
 676                                 } while ( --$n && $job );
 677                         } catch ( MWException $e ) {
 678                                 // We don't want exceptions thrown during job execution to
 679                                 // be reported to the user since the output is already sent.
 680                                 // Instead we just log them.
 681                                 MWExceptionHandler::logException( $e );
 682                         }
 683                 }
 684         }
 685 }