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                 } elseif ( $title == '' && $action != 'delete' ) {
  89                         $ret = Title::newMainPage();
  90                 } else {
  91                         $ret = Title::newFromURL( $title );
  92                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  93                         // in wikitext links to tell Parser to make a direct file link
  94                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  95                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  96                         }
  97                         // Check variant links so that interwiki links don't have to worry
  98                         // about the possible different language variants
  99                         if ( count( $wgContLang->getVariants() ) > 1
 100                                 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 101                         {
 102                                 $wgContLang->findVariantLink( $title, $ret );
 103                         }
 104                 }
 105                 // For non-special titles, check for implicit titles
 106                 if ( is_null( $ret ) || !$ret->isSpecialPage() ) {
 107                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 108                         $oldid = $request->getInt( 'oldid' );
 109                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 110                         // Allow oldid to override a changed or missing title
 111                         if ( $oldid ) {
 112                                 $rev = Revision::newFromId( $oldid );
 113                                 $ret = $rev ? $rev->getTitle() : $ret;
 114                         }
 115                 }
 116
 117                 if ( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ) {
 118                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 119                 }
 120
 121                 return $ret;
 122         }
 123
 124         /**
 125          * Get the Title object that we'll be acting on, as specified in the WebRequest
 126          * @return Title
 127          */
 128         public function getTitle() {
 129                 if ( $this->context->getTitle() === null ) {
 130                         $this->context->setTitle( $this->parseTitle() );
 131                 }
 132                 return $this->context->getTitle();
 133         }
 134
 135         /**
 136          * Returns the name of the action that will be executed.
 137          *
 138          * @return string: action
 139          */
 140         public function getAction() {
 141                 static $action = null;
 142
 143                 if ( $action === null ) {
 144                         $action = Action::getActionName( $this->context );
 145                 }
 146
 147                 return $action;
 148         }
 149
 150         /**
 151          * Create an Article object of the appropriate class for the given page.
 152          *
 153          * @deprecated in 1.18; use Article::newFromTitle() instead
 154          * @param $title Title
 155          * @param $context IContextSource
 156          * @return Article object
 157          */
 158         public static function articleFromTitle( $title, IContextSource $context ) {
 159                 wfDeprecated( __METHOD__, '1.18' );
 160                 return Article::newFromTitle( $title, $context );
 161         }
 162
 163         /**
 164          * Performs the request.
 165          * - bad titles
 166          * - read restriction
 167          * - local interwiki redirects
 168          * - redirect loop
 169          * - special pages
 170          * - normal pages
 171          *
 172          * @throws MWException|PermissionsError|BadTitleError|HttpError
 173          * @return void
 174          */
 175         private function performRequest() {
 176                 global $wgServer, $wgUsePathInfo, $wgTitle;
 177
 178                 wfProfileIn( __METHOD__ );
 179
 180                 $request = $this->context->getRequest();
 181                 $requestTitle = $title = $this->context->getTitle();
 182                 $output = $this->context->getOutput();
 183                 $user = $this->context->getUser();
 184
 185                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 186                         $output->setPrintable();
 187                 }
 188
 189                 $unused = null; // To pass it by reference
 190                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 191
 192                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 193                 if ( is_null( $title ) || ( $title->getDBkey() == '' && $title->getInterwiki() == '' ) ||
 194                         $title->isSpecial( 'Badtitle' ) )
 195                 {
 196                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 197                         wfProfileOut( __METHOD__ );
 198                         throw new BadTitleError();
 199                 }
 200
 201                 // Check user's permissions to read this page.
 202                 // We have to check here to catch special pages etc.
 203                 // We will check again in Article::view().
 204                 $permErrors = $title->getUserPermissionsErrors( 'read', $user );
 205                 if ( count( $permErrors ) ) {
 206                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 207                         // $this->context->title set to the input title would allow anonymous users to
 208                         // determine whether a page exists, potentially leaking private data. In fact, the
 209                         // curid and oldid request  parameters would allow page titles to be enumerated even
 210                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 211                         // permissions error is displayed.
 212                         //
 213                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 214                         // still use $wgTitle.
 215
 216                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 217                         $this->context->setTitle( $badTitle );
 218                         $wgTitle = $badTitle;
 219
 220                         wfProfileOut( __METHOD__ );
 221                         throw new PermissionsError( 'read', $permErrors );
 222                 }
 223
 224                 $pageView = false; // was an article or special page viewed?
 225
 226                 // Interwiki redirects
 227                 if ( $title->getInterwiki() != '' ) {
 228                         $rdfrom = $request->getVal( 'rdfrom' );
 229                         if ( $rdfrom ) {
 230                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 231                         } else {
 232                                 $query = $request->getValues();
 233                                 unset( $query['title'] );
 234                                 $url = $title->getFullURL( $query );
 235                         }
 236                         // Check for a redirect loop
 237                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 238                                 && $title->isLocal() )
 239                         {
 240                                 // 301 so google et al report the target as the actual url.
 241                                 $output->redirect( $url, 301 );
 242                         } else {
 243                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 244                                 wfProfileOut( __METHOD__ );
 245                                 throw new BadTitleError();
 246                         }
 247                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 248                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 249                         && ( $request->getVal( 'title' ) === null ||
 250                                 $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 251                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 252                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) ) )
 253                 {
 254                         if ( $title->isSpecialPage() ) {
 255                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 256                                 if ( $name ) {
 257                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 258                                 }
 259                         }
 260                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 261                         // Redirect to canonical url, make it a 301 to allow caching
 262                         if ( $targetUrl == $request->getFullRequestURL() ) {
 263                                 $message = "Redirect loop detected!\n\n" .
 264                                         "This means the wiki got confused about what page was " .
 265                                         "requested; this sometimes happens when moving a wiki " .
 266                                         "to a new server or changing the server configuration.\n\n";
 267
 268                                 if ( $wgUsePathInfo ) {
 269                                         $message .= "The wiki is trying to interpret the page " .
 270                                                 "title from the URL path portion (PATH_INFO), which " .
 271                                                 "sometimes fails depending on the web server. Try " .
 272                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 273                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 274                                                 "is correct.";
 275                                 } else {
 276                                         $message .= "Your web server was detected as possibly not " .
 277                                                 "supporting URL path components (PATH_INFO) correctly; " .
 278                                                 "check your LocalSettings.php for a customized " .
 279                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 280                                                 "to true.";
 281                                 }
 282                                 throw new HttpError( 500, $message );
 283                         } else {
 284                                 $output->setSquidMaxage( 1200 );
 285                                 $output->redirect( $targetUrl, '301' );
 286                         }
 287                 // Special pages
 288                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 289                         $pageView = true;
 290                         // Actions that need to be made when we have a special pages
 291                         SpecialPageFactory::executePath( $title, $this->context );
 292                 } else {
 293                         // ...otherwise treat it as an article view. The article
 294                         // may be a redirect to another article or URL.
 295                         $article = $this->initializeArticle();
 296                         if ( is_object( $article ) ) {
 297                                 $pageView = true;
 298                                 /**
 299                                  * $wgArticle is deprecated, do not use it.
 300                                  * @deprecated since 1.18
 301                                  */
 302                                 global $wgArticle;
 303                                 $wgArticle = new DeprecatedGlobal( 'wgArticle', $article, '1.18' );
 304
 305                                 $this->performAction( $article, $requestTitle );
 306                         } elseif ( is_string( $article ) ) {
 307                                 $output->redirect( $article );
 308                         } else {
 309                                 wfProfileOut( __METHOD__ );
 310                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
 311                         }
 312                 }
 313
 314                 if ( $pageView ) {
 315                         // Promote user to any groups they meet the criteria for
 316                         $user->addAutopromoteOnceGroups( 'onView' );
 317                 }
 318
 319                 wfProfileOut( __METHOD__ );
 320         }
 321
 322         /**
 323          * Initialize the main Article object for "standard" actions (view, etc)
 324          * Create an Article object for the page, following redirects if needed.
 325          *
 326          * @return mixed an Article, or a string to redirect to another URL
 327          */
 328         private function initializeArticle() {
 329                 global $wgDisableHardRedirects;
 330
 331                 wfProfileIn( __METHOD__ );
 332
 333                 $title = $this->context->getTitle();
 334                 if ( $this->context->canUseWikiPage() ) {
 335                         // Try to use request context wiki page, as there
 336                         // is already data from db saved in per process
 337                         // cache there from this->getAction() call.
 338                         $page = $this->context->getWikiPage();
 339                         $article = Article::newFromWikiPage( $page, $this->context );
 340                 } else {
 341                         // This case should not happen, but just in case.
 342                         $article = Article::newFromTitle( $title, $this->context );
 343                         $this->context->setWikiPage( $article->getPage() );
 344                 }
 345
 346                 // NS_MEDIAWIKI has no redirects.
 347                 // It is also used for CSS/JS, so performance matters here...
 348                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 349                         wfProfileOut( __METHOD__ );
 350                         return $article;
 351                 }
 352
 353                 $request = $this->context->getRequest();
 354
 355                 // Namespace might change when using redirects
 356                 // Check for redirects ...
 357                 $action = $request->getVal( 'action', 'view' );
 358                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 359                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 360                         && !$request->getVal( 'oldid' ) && // ... and are not old revisions
 361                         !$request->getVal( 'diff' ) && // ... and not when showing diff
 362                         $request->getVal( 'redirect' ) != 'no' && // ... unless explicitly told not to
 363                         // ... and the article is not a non-redirect image page with associated file
 364                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 365                 {
 366                         // Give extensions a change to ignore/handle redirects as needed
 367                         $ignoreRedirect = $target = false;
 368
 369                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 370                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 371
 372                         // Follow redirects only for... redirects.
 373                         // If $target is set, then a hook wanted to redirect.
 374                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 375                                 // Is the target already set by an extension?
 376                                 $target = $target ? $target : $article->followRedirect();
 377                                 if ( is_string( $target ) ) {
 378                                         if ( !$wgDisableHardRedirects ) {
 379                                                 // we'll need to redirect
 380                                                 wfProfileOut( __METHOD__ );
 381                                                 return $target;
 382                                         }
 383                                 }
 384                                 if ( is_object( $target ) ) {
 385                                         // Rewrite environment to redirected article
 386                                         $rarticle = Article::newFromTitle( $target, $this->context );
 387                                         $rarticle->loadPageData();
 388                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 389                                                 $rarticle->setRedirectedFrom( $title );
 390                                                 $article = $rarticle;
 391                                                 $this->context->setTitle( $target );
 392                                                 $this->context->setWikiPage( $article->getPage() );
 393                                         }
 394                                 }
 395                         } else {
 396                                 $this->context->setTitle( $article->getTitle() );
 397                                 $this->context->setWikiPage( $article->getPage() );
 398                         }
 399                 }
 400
 401                 wfProfileOut( __METHOD__ );
 402                 return $article;
 403         }
 404
 405         /**
 406          * Perform one of the "standard" actions
 407          *
 408          * @param $page Page
 409          * @param $requestTitle The original title, before any redirects were applied
 410          */
 411         private function performAction( Page $page, Title $requestTitle ) {
 412                 global $wgUseSquid, $wgSquidMaxage;
 413
 414                 wfProfileIn( __METHOD__ );
 415
 416                 $request = $this->context->getRequest();
 417                 $output = $this->context->getOutput();
 418                 $title = $this->context->getTitle();
 419                 $user = $this->context->getUser();
 420
 421                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 422                         array( $output, $page, $title, $user, $request, $this ) ) )
 423                 {
 424                         wfProfileOut( __METHOD__ );
 425                         return;
 426                 }
 427
 428                 $act = $this->getAction();
 429
 430                 $action = Action::factory( $act, $page );
 431                 if ( $action instanceof Action ) {
 432                         # Let Squid cache things if we can purge them.
 433                         if ( $wgUseSquid &&
 434                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 435                         ) {
 436                                 $output->setSquidMaxage( $wgSquidMaxage );
 437                         }
 438
 439                         $action->show();
 440                         wfProfileOut( __METHOD__ );
 441                         return;
 442                 }
 443
 444                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 445                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 446                 }
 447
 448                 wfProfileOut( __METHOD__ );
 449         }
 450
 451         /**
 452          * Run the current MediaWiki instance
 453          * index.php just calls this
 454          */
 455         public function run() {
 456                 try {
 457                         $this->checkMaxLag();
 458                         $this->main();
 459                         $this->restInPeace();
 460                 } catch ( Exception $e ) {
 461                         MWExceptionHandler::handle( $e );
 462                 }
 463         }
 464
 465         /**
 466          * Checks if the request should abort due to a lagged server,
 467          * for given maxlag parameter.
 468          * @return bool
 469          */
 470         private function checkMaxLag() {
 471                 global $wgShowHostnames;
 472
 473                 wfProfileIn( __METHOD__ );
 474                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 475                 if ( !is_null( $maxLag ) ) {
 476                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 477                         if ( $lag > $maxLag ) {
 478                                 $resp = $this->context->getRequest()->response();
 479                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 480                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 481                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 482                                 $resp->header( 'Content-Type: text/plain' );
 483                                 if ( $wgShowHostnames ) {
 484                                         echo "Waiting for $host: $lag seconds lagged\n";
 485                                 } else {
 486                                         echo "Waiting for a database server: $lag seconds lagged\n";
 487                                 }
 488
 489                                 wfProfileOut( __METHOD__ );
 490
 491                                 exit;
 492                         }
 493                 }
 494                 wfProfileOut( __METHOD__ );
 495                 return true;
 496         }
 497
 498         private function main() {
 499                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 500
 501                 wfProfileIn( __METHOD__ );
 502
 503                 $request = $this->context->getRequest();
 504
 505                 if ( $request->getCookie( 'forceHTTPS' )
 506                         && $request->detectProtocol() == 'http'
 507                         && $request->getMethod() == 'GET'
 508                 ) {
 509                         $redirUrl = $request->getFullRequestURL();
 510                         $redirUrl = str_replace( 'http://', 'https://', $redirUrl );
 511
 512                         // Setup dummy Title, otherwise OutputPage::redirect will fail
 513                         $title = Title::newFromText( NS_MAIN, 'REDIR' );
 514                         $this->context->setTitle( $title );
 515                         $output = $this->context->getOutput();
 516                         $output->redirect( $redirUrl );
 517                         $output->output();
 518                         wfProfileOut( __METHOD__ );
 519                         return;
 520                 }
 521
 522                 // Send Ajax requests to the Ajax dispatcher.
 523                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 524
 525                         // Set a dummy title, because $wgTitle == null might break things
 526                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 527                         $this->context->setTitle( $title );
 528                         $wgTitle = $title;
 529
 530                         $dispatcher = new AjaxDispatcher();
 531                         $dispatcher->performAction();
 532                         wfProfileOut( __METHOD__ );
 533                         return;
 534                 }
 535
 536                 // Get title from request parameters,
 537                 // is set on the fly by parseTitle the first time.
 538                 $title = $this->getTitle();
 539                 $action = $this->getAction();
 540                 $wgTitle = $title;
 541
 542                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 543                         wfProfileIn( 'main-try-filecache' );
 544                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 545                                 // Try low-level file cache hit
 546                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 547                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 548                                         // Check incoming headers to see if client has this cached
 549                                         $timestamp = $cache->cacheTimestamp();
 550                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 551                                                 $cache->loadFromFileCache( $this->context );
 552                                         }
 553                                         // Do any stats increment/watchlist stuff
 554                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 555                                         // Tell OutputPage that output is taken care of
 556                                         $this->context->getOutput()->disable();
 557                                         wfProfileOut( 'main-try-filecache' );
 558                                         wfProfileOut( __METHOD__ );
 559                                         return;
 560                                 }
 561                         }
 562                         wfProfileOut( 'main-try-filecache' );
 563                 }
 564
 565                 $this->performRequest();
 566
 567                 // Now commit any transactions, so that unreported errors after
 568                 // output() don't roll back the whole DB transaction
 569                 wfGetLBFactory()->commitMasterChanges();
 570
 571                 // Output everything!
 572                 $this->context->getOutput()->output();
 573
 574                 wfProfileOut( __METHOD__ );
 575         }
 576
 577         /**
 578          * Ends this task peacefully
 579          */
 580         public function restInPeace() {
 581                 // Do any deferred jobs
 582                 DeferredUpdates::doUpdates( 'commit' );
 583
 584                 // Execute a job from the queue
 585                 $this->doJobs();
 586
 587                 // Log profiling data, e.g. in the database or UDP
 588                 wfLogProfilingData();
 589
 590                 // Commit and close up!
 591                 $factory = wfGetLBFactory();
 592                 $factory->commitMasterChanges();
 593                 $factory->shutdown();
 594
 595                 wfDebug( "Request ended normally\n" );
 596         }
 597
 598         /**
 599          * Do a job from the job queue
 600          */
 601         private function doJobs() {
 602                 global $wgJobRunRate, $wgPhpCli, $IP;
 603
 604                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 605                         return;
 606                 }
 607
 608                 if ( $wgJobRunRate < 1 ) {
 609                         $max = mt_getrandmax();
 610                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 611                                 return; // the higher $wgJobRunRate, the less likely we return here
 612                         }
 613                         $n = 1;
 614                 } else {
 615                         $n = intval( $wgJobRunRate );
 616                 }
 617
 618                 if ( !wfShellExecDisabled() && is_executable( $wgPhpCli ) ) {
 619                         // Start a background process to run some of the jobs.
 620                         // This will be asynchronous on *nix though not on Windows.
 621                         wfProfileIn( __METHOD__ . '-exec' );
 622                         $retVal = 1;
 623                         $cmd = wfShellWikiCmd( "$IP/maintenance/runJobs.php", array( '--maxjobs', $n ) );
 624                         wfShellExec( "$cmd &", $retVal );
 625                         wfProfileOut( __METHOD__ . '-exec' );
 626                 } else {
 627                         try {
 628                                 // Fallback to running the jobs here while the user waits
 629                                 $group = JobQueueGroup::singleton();
 630                                 do {
 631                                         $job = $group->pop( JobQueueGroup::USE_CACHE ); // job from any queue
 632                                         if ( $job ) {
 633                                                 $output = $job->toString() . "\n";
 634                                                 $t = - microtime( true );
 635                                                 wfProfileIn( __METHOD__ . '-' . get_class( $job ) );
 636                                                 $success = $job->run();
 637                                                 wfProfileOut( __METHOD__ . '-' . get_class( $job ) );
 638                                                 $group->ack( $job ); // done
 639                                                 $t += microtime( true );
 640                                                 $t = round( $t * 1000 );
 641                                                 if ( $success === false ) {
 642                                                         $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 643                                                 } else {
 644                                                         $output .= "Success, Time: $t ms\n";
 645                                                 }
 646                                                 wfDebugLog( 'jobqueue', $output );
 647                                         }
 648                                 } while ( --$n && $job );
 649                         } catch ( MWException $e ) {
 650                                 // We don't want exceptions thrown during job execution to
 651                                 // be reported to the user since the output is already sent.
 652                                 // Instead we just log them.
 653                                 wfDebugLog( 'exception', $e->getLogMessage() );
 654                         }
 655                 }
 656         }
 657 }