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 ) === '' && $action !== 'delete' ) {
 121                         $ret = Title::newMainPage();
 122                 }
 123
 124                 if ( $ret === null || ( $ret->getDBkey() == '' && $ret->getInterwiki() == '' ) ) {
 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          * Create an Article object of the appropriate class for the given page.
 159          *
 160          * @deprecated in 1.18; use Article::newFromTitle() instead
 161          * @param $title Title
 162          * @param $context IContextSource
 163          * @return Article object
 164          */
 165         public static function articleFromTitle( $title, IContextSource $context ) {
 166                 wfDeprecated( __METHOD__, '1.18' );
 167                 return Article::newFromTitle( $title, $context );
 168         }
 169
 170         /**
 171          * Performs the request.
 172          * - bad titles
 173          * - read restriction
 174          * - local interwiki redirects
 175          * - redirect loop
 176          * - special pages
 177          * - normal pages
 178          *
 179          * @throws MWException|PermissionsError|BadTitleError|HttpError
 180          * @return void
 181          */
 182         private function performRequest() {
 183                 global $wgServer, $wgUsePathInfo, $wgTitle;
 184
 185                 wfProfileIn( __METHOD__ );
 186
 187                 $request = $this->context->getRequest();
 188                 $requestTitle = $title = $this->context->getTitle();
 189                 $output = $this->context->getOutput();
 190                 $user = $this->context->getUser();
 191
 192                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 193                         $output->setPrintable();
 194                 }
 195
 196                 $unused = null; // To pass it by reference
 197                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 198
 199                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 200                 if ( is_null( $title ) || ( $title->getDBkey() == '' && $title->getInterwiki() == '' ) ||
 201                         $title->isSpecial( 'Badtitle' ) )
 202                 {
 203                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 204                         wfProfileOut( __METHOD__ );
 205                         throw new BadTitleError();
 206                 }
 207
 208                 // Check user's permissions to read this page.
 209                 // We have to check here to catch special pages etc.
 210                 // We will check again in Article::view().
 211                 $permErrors = $title->getUserPermissionsErrors( 'read', $user );
 212                 if ( count( $permErrors ) ) {
 213                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 214                         // $this->context->title set to the input title would allow anonymous users to
 215                         // determine whether a page exists, potentially leaking private data. In fact, the
 216                         // curid and oldid request  parameters would allow page titles to be enumerated even
 217                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 218                         // permissions error is displayed.
 219                         //
 220                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 221                         // still use $wgTitle.
 222
 223                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 224                         $this->context->setTitle( $badTitle );
 225                         $wgTitle = $badTitle;
 226
 227                         wfProfileOut( __METHOD__ );
 228                         throw new PermissionsError( 'read', $permErrors );
 229                 }
 230
 231                 $pageView = false; // was an article or special page viewed?
 232
 233                 // Interwiki redirects
 234                 if ( $title->getInterwiki() != '' ) {
 235                         $rdfrom = $request->getVal( 'rdfrom' );
 236                         if ( $rdfrom ) {
 237                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 238                         } else {
 239                                 $query = $request->getValues();
 240                                 unset( $query['title'] );
 241                                 $url = $title->getFullURL( $query );
 242                         }
 243                         // Check for a redirect loop
 244                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 245                                 && $title->isLocal() )
 246                         {
 247                                 // 301 so google et al report the target as the actual url.
 248                                 $output->redirect( $url, 301 );
 249                         } else {
 250                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 251                                 wfProfileOut( __METHOD__ );
 252                                 throw new BadTitleError();
 253                         }
 254                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 255                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 256                         && ( $request->getVal( 'title' ) === null ||
 257                                 $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 258                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 259                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) ) )
 260                 {
 261                         if ( $title->isSpecialPage() ) {
 262                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 263                                 if ( $name ) {
 264                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 265                                 }
 266                         }
 267                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 268                         // Redirect to canonical url, make it a 301 to allow caching
 269                         if ( $targetUrl == $request->getFullRequestURL() ) {
 270                                 $message = "Redirect loop detected!\n\n" .
 271                                         "This means the wiki got confused about what page was " .
 272                                         "requested; this sometimes happens when moving a wiki " .
 273                                         "to a new server or changing the server configuration.\n\n";
 274
 275                                 if ( $wgUsePathInfo ) {
 276                                         $message .= "The wiki is trying to interpret the page " .
 277                                                 "title from the URL path portion (PATH_INFO), which " .
 278                                                 "sometimes fails depending on the web server. Try " .
 279                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 280                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 281                                                 "is correct.";
 282                                 } else {
 283                                         $message .= "Your web server was detected as possibly not " .
 284                                                 "supporting URL path components (PATH_INFO) correctly; " .
 285                                                 "check your LocalSettings.php for a customized " .
 286                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 287                                                 "to true.";
 288                                 }
 289                                 throw new HttpError( 500, $message );
 290                         } else {
 291                                 $output->setSquidMaxage( 1200 );
 292                                 $output->redirect( $targetUrl, '301' );
 293                         }
 294                 // Special pages
 295                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 296                         $pageView = true;
 297                         // Actions that need to be made when we have a special pages
 298                         SpecialPageFactory::executePath( $title, $this->context );
 299                 } else {
 300                         // ...otherwise treat it as an article view. The article
 301                         // may be a redirect to another article or URL.
 302                         $article = $this->initializeArticle();
 303                         if ( is_object( $article ) ) {
 304                                 $pageView = true;
 305                                 /**
 306                                  * $wgArticle is deprecated, do not use it.
 307                                  * @deprecated since 1.18
 308                                  */
 309                                 global $wgArticle;
 310                                 $wgArticle = new DeprecatedGlobal( 'wgArticle', $article, '1.18' );
 311
 312                                 $this->performAction( $article, $requestTitle );
 313                         } elseif ( is_string( $article ) ) {
 314                                 $output->redirect( $article );
 315                         } else {
 316                                 wfProfileOut( __METHOD__ );
 317                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 318                                         . " returned neither an object nor a URL" );
 319                         }
 320                 }
 321
 322                 if ( $pageView ) {
 323                         // Promote user to any groups they meet the criteria for
 324                         $user->addAutopromoteOnceGroups( 'onView' );
 325                 }
 326
 327                 wfProfileOut( __METHOD__ );
 328         }
 329
 330         /**
 331          * Initialize the main Article object for "standard" actions (view, etc)
 332          * Create an Article object for the page, following redirects if needed.
 333          *
 334          * @return mixed an Article, or a string to redirect to another URL
 335          */
 336         private function initializeArticle() {
 337                 global $wgDisableHardRedirects;
 338
 339                 wfProfileIn( __METHOD__ );
 340
 341                 $title = $this->context->getTitle();
 342                 if ( $this->context->canUseWikiPage() ) {
 343                         // Try to use request context wiki page, as there
 344                         // is already data from db saved in per process
 345                         // cache there from this->getAction() call.
 346                         $page = $this->context->getWikiPage();
 347                         $article = Article::newFromWikiPage( $page, $this->context );
 348                 } else {
 349                         // This case should not happen, but just in case.
 350                         $article = Article::newFromTitle( $title, $this->context );
 351                         $this->context->setWikiPage( $article->getPage() );
 352                 }
 353
 354                 // NS_MEDIAWIKI has no redirects.
 355                 // It is also used for CSS/JS, so performance matters here...
 356                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 357                         wfProfileOut( __METHOD__ );
 358                         return $article;
 359                 }
 360
 361                 $request = $this->context->getRequest();
 362
 363                 // Namespace might change when using redirects
 364                 // Check for redirects ...
 365                 $action = $request->getVal( 'action', 'view' );
 366                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 367                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 368                         && !$request->getVal( 'oldid' ) && // ... and are not old revisions
 369                         !$request->getVal( 'diff' ) && // ... and not when showing diff
 370                         $request->getVal( 'redirect' ) != 'no' && // ... unless explicitly told not to
 371                         // ... and the article is not a non-redirect image page with associated file
 372                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 373                 {
 374                         // Give extensions a change to ignore/handle redirects as needed
 375                         $ignoreRedirect = $target = false;
 376
 377                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 378                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 379
 380                         // Follow redirects only for... redirects.
 381                         // If $target is set, then a hook wanted to redirect.
 382                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 383                                 // Is the target already set by an extension?
 384                                 $target = $target ? $target : $article->followRedirect();
 385                                 if ( is_string( $target ) ) {
 386                                         if ( !$wgDisableHardRedirects ) {
 387                                                 // we'll need to redirect
 388                                                 wfProfileOut( __METHOD__ );
 389                                                 return $target;
 390                                         }
 391                                 }
 392                                 if ( is_object( $target ) ) {
 393                                         // Rewrite environment to redirected article
 394                                         $rarticle = Article::newFromTitle( $target, $this->context );
 395                                         $rarticle->loadPageData();
 396                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 397                                                 $rarticle->setRedirectedFrom( $title );
 398                                                 $article = $rarticle;
 399                                                 $this->context->setTitle( $target );
 400                                                 $this->context->setWikiPage( $article->getPage() );
 401                                         }
 402                                 }
 403                         } else {
 404                                 $this->context->setTitle( $article->getTitle() );
 405                                 $this->context->setWikiPage( $article->getPage() );
 406                         }
 407                 }
 408
 409                 wfProfileOut( __METHOD__ );
 410                 return $article;
 411         }
 412
 413         /**
 414          * Perform one of the "standard" actions
 415          *
 416          * @param $page Page
 417          * @param $requestTitle The original title, before any redirects were applied
 418          */
 419         private function performAction( Page $page, Title $requestTitle ) {
 420                 global $wgUseSquid, $wgSquidMaxage;
 421
 422                 wfProfileIn( __METHOD__ );
 423
 424                 $request = $this->context->getRequest();
 425                 $output = $this->context->getOutput();
 426                 $title = $this->context->getTitle();
 427                 $user = $this->context->getUser();
 428
 429                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 430                         array( $output, $page, $title, $user, $request, $this ) ) )
 431                 {
 432                         wfProfileOut( __METHOD__ );
 433                         return;
 434                 }
 435
 436                 $act = $this->getAction();
 437
 438                 $action = Action::factory( $act, $page, $this->context );
 439
 440                 if ( $action instanceof Action ) {
 441                         # Let Squid cache things if we can purge them.
 442                         if ( $wgUseSquid &&
 443                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 444                         ) {
 445                                 $output->setSquidMaxage( $wgSquidMaxage );
 446                         }
 447
 448                         $action->show();
 449                         wfProfileOut( __METHOD__ );
 450                         return;
 451                 }
 452
 453                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 454                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 455                 }
 456
 457                 wfProfileOut( __METHOD__ );
 458         }
 459
 460         /**
 461          * Run the current MediaWiki instance
 462          * index.php just calls this
 463          */
 464         public function run() {
 465                 try {
 466                         $this->checkMaxLag();
 467                         $this->main();
 468                         $this->restInPeace();
 469                 } catch ( Exception $e ) {
 470                         MWExceptionHandler::handle( $e );
 471                 }
 472         }
 473
 474         /**
 475          * Checks if the request should abort due to a lagged server,
 476          * for given maxlag parameter.
 477          * @return bool
 478          */
 479         private function checkMaxLag() {
 480                 global $wgShowHostnames;
 481
 482                 wfProfileIn( __METHOD__ );
 483                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 484                 if ( !is_null( $maxLag ) ) {
 485                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 486                         if ( $lag > $maxLag ) {
 487                                 $resp = $this->context->getRequest()->response();
 488                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 489                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 490                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 491                                 $resp->header( 'Content-Type: text/plain' );
 492                                 if ( $wgShowHostnames ) {
 493                                         echo "Waiting for $host: $lag seconds lagged\n";
 494                                 } else {
 495                                         echo "Waiting for a database server: $lag seconds lagged\n";
 496                                 }
 497
 498                                 wfProfileOut( __METHOD__ );
 499
 500                                 exit;
 501                         }
 502                 }
 503                 wfProfileOut( __METHOD__ );
 504                 return true;
 505         }
 506
 507         private function main() {
 508                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 509
 510                 wfProfileIn( __METHOD__ );
 511
 512                 $request = $this->context->getRequest();
 513
 514                 // Send Ajax requests to the Ajax dispatcher.
 515                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 516
 517                         // Set a dummy title, because $wgTitle == null might break things
 518                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 519                         $this->context->setTitle( $title );
 520                         $wgTitle = $title;
 521
 522                         $dispatcher = new AjaxDispatcher();
 523                         $dispatcher->performAction();
 524                         wfProfileOut( __METHOD__ );
 525                         return;
 526                 }
 527
 528                 // Get title from request parameters,
 529                 // is set on the fly by parseTitle the first time.
 530                 $title = $this->getTitle();
 531                 $action = $this->getAction();
 532                 $wgTitle = $title;
 533
 534                 // If the user has forceHTTPS set to true, or if the user
 535                 // is in a group requiring HTTPS, or if they have the HTTPS
 536                 // preference set, redirect them to HTTPS.
 537                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 538                 // isLoggedIn() will do all sorts of weird stuff.
 539                 if (
 540                         (
 541                                 $request->getCookie( 'forceHTTPS', '' ) ||
 542                                 // check for prefixed version for currently logged in users
 543                                 $request->getCookie( 'forceHTTPS' ) ||
 544                                 // Avoid checking the user and groups unless it's enabled.
 545                                 (
 546                                         $this->context->getUser()->isLoggedIn()
 547                                         && $this->context->getUser()->requiresHTTPS()
 548                                 )
 549                         ) &&
 550                         $request->detectProtocol() == 'http'
 551                 ) {
 552                         $oldUrl = $request->getFullRequestURL();
 553                         $redirUrl = str_replace( 'http://', 'https://', $oldUrl );
 554
 555                         if ( $request->wasPosted() ) {
 556                                 // This is weird and we'd hope it almost never happens. This
 557                                 // means that a POST came in via HTTP and policy requires us
 558                                 // redirecting to HTTPS. It's likely such a request is going
 559                                 // to fail due to post data being lost, but let's try anyway
 560                                 // and just log the instance.
 561                                 //
 562                                 // @todo @fixme See if we could issue a 307 or 308 here, need
 563                                 // to see how clients (automated & browser) behave when we do
 564                                 wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 565                         }
 566
 567                         // Setup dummy Title, otherwise OutputPage::redirect will fail
 568                         $title = Title::newFromText( NS_MAIN, 'REDIR' );
 569                         $this->context->setTitle( $title );
 570                         $output = $this->context->getOutput();
 571                         // Since we only do this redir to change proto, always send a vary header
 572                         $output->addVaryHeader( 'X-Forwarded-Proto' );
 573                         $output->redirect( $redirUrl );
 574                         $output->output();
 575                         wfProfileOut( __METHOD__ );
 576                         return;
 577                 }
 578
 579                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 580                         wfProfileIn( 'main-try-filecache' );
 581                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 582                                 // Try low-level file cache hit
 583                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 584                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 585                                         // Check incoming headers to see if client has this cached
 586                                         $timestamp = $cache->cacheTimestamp();
 587                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 588                                                 $cache->loadFromFileCache( $this->context );
 589                                         }
 590                                         // Do any stats increment/watchlist stuff
 591                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 592                                         // Tell OutputPage that output is taken care of
 593                                         $this->context->getOutput()->disable();
 594                                         wfProfileOut( 'main-try-filecache' );
 595                                         wfProfileOut( __METHOD__ );
 596                                         return;
 597                                 }
 598                         }
 599                         wfProfileOut( 'main-try-filecache' );
 600                 }
 601
 602                 $this->performRequest();
 603
 604                 // Now commit any transactions, so that unreported errors after
 605                 // output() don't roll back the whole DB transaction
 606                 wfGetLBFactory()->commitMasterChanges();
 607
 608                 // Output everything!
 609                 $this->context->getOutput()->output();
 610
 611                 wfProfileOut( __METHOD__ );
 612         }
 613
 614         /**
 615          * Ends this task peacefully
 616          */
 617         public function restInPeace() {
 618                 // Do any deferred jobs
 619                 DeferredUpdates::doUpdates( 'commit' );
 620
 621                 // Execute a job from the queue
 622                 $this->doJobs();
 623
 624                 // Log profiling data, e.g. in the database or UDP
 625                 wfLogProfilingData();
 626
 627                 // Commit and close up!
 628                 $factory = wfGetLBFactory();
 629                 $factory->commitMasterChanges();
 630                 $factory->shutdown();
 631
 632                 wfDebug( "Request ended normally\n" );
 633         }
 634
 635         /**
 636          * Do a job from the job queue
 637          */
 638         private function doJobs() {
 639                 global $wgJobRunRate, $wgPhpCli, $IP;
 640
 641                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 642                         return;
 643                 }
 644
 645                 if ( $wgJobRunRate < 1 ) {
 646                         $max = mt_getrandmax();
 647                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 648                                 return; // the higher $wgJobRunRate, the less likely we return here
 649                         }
 650                         $n = 1;
 651                 } else {
 652                         $n = intval( $wgJobRunRate );
 653                 }
 654
 655                 if ( !wfShellExecDisabled() && is_executable( $wgPhpCli ) ) {
 656                         // Start a background process to run some of the jobs.
 657                         // This will be asynchronous on *nix though not on Windows.
 658                         wfProfileIn( __METHOD__ . '-exec' );
 659                         $retVal = 1;
 660                         $cmd = wfShellWikiCmd( "$IP/maintenance/runJobs.php", array( '--maxjobs', $n ) );
 661                         wfShellExec( "$cmd &", $retVal );
 662                         wfProfileOut( __METHOD__ . '-exec' );
 663                 } else {
 664                         try {
 665                                 // Fallback to running the jobs here while the user waits
 666                                 $group = JobQueueGroup::singleton();
 667                                 do {
 668                                         $job = $group->pop( JobQueueGroup::USE_CACHE ); // job from any queue
 669                                         if ( $job ) {
 670                                                 $output = $job->toString() . "\n";
 671                                                 $t = - microtime( true );
 672                                                 wfProfileIn( __METHOD__ . '-' . get_class( $job ) );
 673                                                 $success = $job->run();
 674                                                 wfProfileOut( __METHOD__ . '-' . get_class( $job ) );
 675                                                 $group->ack( $job ); // done
 676                                                 $t += microtime( true );
 677                                                 $t = round( $t * 1000 );
 678                                                 if ( $success === false ) {
 679                                                         $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 680                                                 } else {
 681                                                         $output .= "Success, Time: $t ms\n";
 682                                                 }
 683                                                 wfDebugLog( 'jobqueue', $output );
 684                                         }
 685                                 } while ( --$n && $job );
 686                         } catch ( MWException $e ) {
 687                                 // We don't want exceptions thrown during job execution to
 688                                 // be reported to the user since the output is already sent.
 689                                 // Instead we just log them.
 690                                 wfDebugLog( 'exception', $e->getLogMessage() );
 691                         }
 692                 }
 693         }
 694 }