includes/MediaWiki.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          * @todo Fold $output, etc, into this
  31          * @var IContextSource
  32          */
  33         private $context;
  34
  35         /**
  36          * @param null|WebRequest $x
  37          * @return WebRequest
  38          */
  39         public function request( WebRequest $x = null ) {
  40                 $old = $this->context->getRequest();
  41                 $this->context->setRequest( $x );
  42                 return $old;
  43         }
  44
  45         /**
  46          * @param null|OutputPage $x
  47          * @return OutputPage
  48          */
  49         public function output( OutputPage $x = null ) {
  50                 $old = $this->context->getOutput();
  51                 $this->context->setOutput( $x );
  52                 return $old;
  53         }
  54
  55         /**
  56          * @param IContextSource|null $context
  57          */
  58         public function __construct( IContextSource $context = null ) {
  59                 if ( !$context ) {
  60                         $context = RequestContext::getMain();
  61                 }
  62
  63                 $this->context = $context;
  64         }
  65
  66         /**
  67          * Parse the request to get the Title object
  68          *
  69          * @return Title Title object to be $wgTitle
  70          */
  71         private function parseTitle() {
  72                 global $wgContLang;
  73
  74                 $request = $this->context->getRequest();
  75                 $curid = $request->getInt( 'curid' );
  76                 $title = $request->getVal( 'title' );
  77                 $action = $request->getVal( 'action', 'view' );
  78
  79                 if ( $request->getCheck( 'search' ) ) {
  80                         // Compatibility with old search URLs which didn't use Special:Search
  81                         // Just check for presence here, so blank requests still
  82                         // show the search page when using ugly URLs (bug 8054).
  83                         $ret = SpecialPage::getTitleFor( 'Search' );
  84                 } elseif ( $curid ) {
  85                         // URLs like this are generated by RC, because rc_title isn't always accurate
  86                         $ret = Title::newFromID( $curid );
  87                 } else {
  88                         $ret = Title::newFromURL( $title );
  89                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  90                         // in wikitext links to tell Parser to make a direct file link
  91                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  92                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  93                         }
  94                         // Check variant links so that interwiki links don't have to worry
  95                         // about the possible different language variants
  96                         if ( count( $wgContLang->getVariants() ) > 1
  97                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  98                         ) {
  99                                 $wgContLang->findVariantLink( $title, $ret );
 100                         }
 101                 }
 102
 103                 // If title is not provided, always allow oldid and diff to set the title.
 104                 // If title is provided, allow oldid and diff to override the title, unless
 105                 // we are talking about a special page which might use these parameters for
 106                 // other purposes.
 107                 if ( $ret === null || !$ret->isSpecialPage() ) {
 108                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 109                         $oldid = $request->getInt( 'oldid' );
 110                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 111                         // Allow oldid to override a changed or missing title
 112                         if ( $oldid ) {
 113                                 $rev = Revision::newFromId( $oldid );
 114                                 $ret = $rev ? $rev->getTitle() : $ret;
 115                         }
 116                 }
 117
 118                 // Use the main page as default title if nothing else has been provided
 119                 if ( $ret === null
 120                         && strval( $title ) === ''
 121                         && !$request->getCheck( 'curid' )
 122                         && $action !== 'delete'
 123                 ) {
 124                         $ret = Title::newMainPage();
 125                 }
 126
 127                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 128                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 129                 }
 130
 131                 return $ret;
 132         }
 133
 134         /**
 135          * Get the Title object that we'll be acting on, as specified in the WebRequest
 136          * @return Title
 137          */
 138         public function getTitle() {
 139                 if ( $this->context->getTitle() === null ) {
 140                         $this->context->setTitle( $this->parseTitle() );
 141                 }
 142                 return $this->context->getTitle();
 143         }
 144
 145         /**
 146          * Returns the name of the action that will be executed.
 147          *
 148          * @return string Action
 149          */
 150         public function getAction() {
 151                 static $action = null;
 152
 153                 if ( $action === null ) {
 154                         $action = Action::getActionName( $this->context );
 155                 }
 156
 157                 return $action;
 158         }
 159
 160         /**
 161          * Performs the request.
 162          * - bad titles
 163          * - read restriction
 164          * - local interwiki redirects
 165          * - redirect loop
 166          * - special pages
 167          * - normal pages
 168          *
 169          * @throws MWException|PermissionsError|BadTitleError|HttpError
 170          * @return void
 171          */
 172         private function performRequest() {
 173                 global $wgServer, $wgUsePathInfo, $wgTitle;
 174
 175                 wfProfileIn( __METHOD__ );
 176
 177                 $request = $this->context->getRequest();
 178                 $requestTitle = $title = $this->context->getTitle();
 179                 $output = $this->context->getOutput();
 180                 $user = $this->context->getUser();
 181
 182                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 183                         $output->setPrintable();
 184                 }
 185
 186                 $unused = null; // To pass it by reference
 187                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 188
 189                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 190                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 191                         || $title->isSpecial( 'Badtitle' )
 192                 ) {
 193                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 194                         wfProfileOut( __METHOD__ );
 195                         throw new BadTitleError();
 196                 }
 197
 198                 // Check user's permissions to read this page.
 199                 // We have to check here to catch special pages etc.
 200                 // We will check again in Article::view().
 201                 $permErrors = $title->isSpecial( 'RunJobs' )
 202                         ? array() // relies on HMAC key signature alone
 203                         : $title->getUserPermissionsErrors( 'read', $user );
 204                 if ( count( $permErrors ) ) {
 205                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 206                         // $this->context->title set to the input title would allow anonymous users to
 207                         // determine whether a page exists, potentially leaking private data. In fact, the
 208                         // curid and oldid request  parameters would allow page titles to be enumerated even
 209                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 210                         // permissions error is displayed.
 211                         //
 212                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 213                         // still use $wgTitle.
 214
 215                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 216                         $this->context->setTitle( $badTitle );
 217                         $wgTitle = $badTitle;
 218
 219                         wfProfileOut( __METHOD__ );
 220                         throw new PermissionsError( 'read', $permErrors );
 221                 }
 222
 223                 $pageView = false; // was an article or special page viewed?
 224
 225                 // Interwiki redirects
 226                 if ( $title->isExternal() ) {
 227                         $rdfrom = $request->getVal( 'rdfrom' );
 228                         if ( $rdfrom ) {
 229                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 230                         } else {
 231                                 $query = $request->getValues();
 232                                 unset( $query['title'] );
 233                                 $url = $title->getFullURL( $query );
 234                         }
 235                         // Check for a redirect loop
 236                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 237                                 && $title->isLocal()
 238                         ) {
 239                                 // 301 so google et al report the target as the actual url.
 240                                 $output->redirect( $url, 301 );
 241                         } else {
 242                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 243                                 wfProfileOut( __METHOD__ );
 244                                 throw new BadTitleError();
 245                         }
 246                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 247                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 248                         && ( $request->getVal( 'title' ) === null
 249                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 250                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 251                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 252                 ) {
 253                         if ( $title->isSpecialPage() ) {
 254                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 255                                 if ( $name ) {
 256                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 257                                 }
 258                         }
 259                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 260                         // Redirect to canonical url, make it a 301 to allow caching
 261                         if ( $targetUrl == $request->getFullRequestURL() ) {
 262                                 $message = "Redirect loop detected!\n\n" .
 263                                         "This means the wiki got confused about what page was " .
 264                                         "requested; this sometimes happens when moving a wiki " .
 265                                         "to a new server or changing the server configuration.\n\n";
 266
 267                                 if ( $wgUsePathInfo ) {
 268                                         $message .= "The wiki is trying to interpret the page " .
 269                                                 "title from the URL path portion (PATH_INFO), which " .
 270                                                 "sometimes fails depending on the web server. Try " .
 271                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 272                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 273                                                 "is correct.";
 274                                 } else {
 275                                         $message .= "Your web server was detected as possibly not " .
 276                                                 "supporting URL path components (PATH_INFO) correctly; " .
 277                                                 "check your LocalSettings.php for a customized " .
 278                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 279                                                 "to true.";
 280                                 }
 281                                 throw new HttpError( 500, $message );
 282                         } else {
 283                                 $output->setSquidMaxage( 1200 );
 284                                 $output->redirect( $targetUrl, '301' );
 285                         }
 286                 // Special pages
 287                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 288                         $pageView = true;
 289                         // Actions that need to be made when we have a special pages
 290                         SpecialPageFactory::executePath( $title, $this->context );
 291                 } else {
 292                         // ...otherwise treat it as an article view. The article
 293                         // may be a redirect to another article or URL.
 294                         $article = $this->initializeArticle();
 295                         if ( is_object( $article ) ) {
 296                                 $pageView = true;
 297                                 $this->performAction( $article, $requestTitle );
 298                         } elseif ( is_string( $article ) ) {
 299                                 $output->redirect( $article );
 300                         } else {
 301                                 wfProfileOut( __METHOD__ );
 302                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 303                                         . " returned neither an object nor a URL" );
 304                         }
 305                 }
 306
 307                 if ( $pageView ) {
 308                         // Promote user to any groups they meet the criteria for
 309                         $user->addAutopromoteOnceGroups( 'onView' );
 310                 }
 311
 312                 wfProfileOut( __METHOD__ );
 313         }
 314
 315         /**
 316          * Initialize the main Article object for "standard" actions (view, etc)
 317          * Create an Article object for the page, following redirects if needed.
 318          *
 319          * @return mixed An Article, or a string to redirect to another URL
 320          */
 321         private function initializeArticle() {
 322                 global $wgDisableHardRedirects;
 323
 324                 wfProfileIn( __METHOD__ );
 325
 326                 $title = $this->context->getTitle();
 327                 if ( $this->context->canUseWikiPage() ) {
 328                         // Try to use request context wiki page, as there
 329                         // is already data from db saved in per process
 330                         // cache there from this->getAction() call.
 331                         $page = $this->context->getWikiPage();
 332                         $article = Article::newFromWikiPage( $page, $this->context );
 333                 } else {
 334                         // This case should not happen, but just in case.
 335                         $article = Article::newFromTitle( $title, $this->context );
 336                         $this->context->setWikiPage( $article->getPage() );
 337                 }
 338
 339                 // NS_MEDIAWIKI has no redirects.
 340                 // It is also used for CSS/JS, so performance matters here...
 341                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 342                         wfProfileOut( __METHOD__ );
 343                         return $article;
 344                 }
 345
 346                 $request = $this->context->getRequest();
 347
 348                 // Namespace might change when using redirects
 349                 // Check for redirects ...
 350                 $action = $request->getVal( 'action', 'view' );
 351                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 352                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 353                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 354                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 355                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 356                         // ... and the article is not a non-redirect image page with associated file
 357                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 358                 ) {
 359                         // Give extensions a change to ignore/handle redirects as needed
 360                         $ignoreRedirect = $target = false;
 361
 362                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 363                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 364
 365                         // Follow redirects only for... redirects.
 366                         // If $target is set, then a hook wanted to redirect.
 367                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 368                                 // Is the target already set by an extension?
 369                                 $target = $target ? $target : $article->followRedirect();
 370                                 if ( is_string( $target ) ) {
 371                                         if ( !$wgDisableHardRedirects ) {
 372                                                 // we'll need to redirect
 373                                                 wfProfileOut( __METHOD__ );
 374                                                 return $target;
 375                                         }
 376                                 }
 377                                 if ( is_object( $target ) ) {
 378                                         // Rewrite environment to redirected article
 379                                         $rarticle = Article::newFromTitle( $target, $this->context );
 380                                         $rarticle->loadPageData();
 381                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 382                                                 $rarticle->setRedirectedFrom( $title );
 383                                                 $article = $rarticle;
 384                                                 $this->context->setTitle( $target );
 385                                                 $this->context->setWikiPage( $article->getPage() );
 386                                         }
 387                                 }
 388                         } else {
 389                                 $this->context->setTitle( $article->getTitle() );
 390                                 $this->context->setWikiPage( $article->getPage() );
 391                         }
 392                 }
 393
 394                 wfProfileOut( __METHOD__ );
 395                 return $article;
 396         }
 397
 398         /**
 399          * Perform one of the "standard" actions
 400          *
 401          * @param Page $page
 402          * @param Title $requestTitle The original title, before any redirects were applied
 403          */
 404         private function performAction( Page $page, Title $requestTitle ) {
 405                 global $wgUseSquid, $wgSquidMaxage;
 406
 407                 wfProfileIn( __METHOD__ );
 408
 409                 $request = $this->context->getRequest();
 410                 $output = $this->context->getOutput();
 411                 $title = $this->context->getTitle();
 412                 $user = $this->context->getUser();
 413
 414                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 415                                 array( $output, $page, $title, $user, $request, $this ) )
 416                 ) {
 417                         wfProfileOut( __METHOD__ );
 418                         return;
 419                 }
 420
 421                 $act = $this->getAction();
 422
 423                 $action = Action::factory( $act, $page, $this->context );
 424
 425                 if ( $action instanceof Action ) {
 426                         # Let Squid cache things if we can purge them.
 427                         if ( $wgUseSquid &&
 428                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 429                         ) {
 430                                 $output->setSquidMaxage( $wgSquidMaxage );
 431                         }
 432
 433                         $action->show();
 434                         wfProfileOut( __METHOD__ );
 435                         return;
 436                 }
 437
 438                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 439                         $output->setStatusCode( 404 );
 440                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 441                 }
 442
 443                 wfProfileOut( __METHOD__ );
 444         }
 445
 446         /**
 447          * Run the current MediaWiki instance
 448          * index.php just calls this
 449          */
 450         public function run() {
 451                 try {
 452                         $this->checkMaxLag();
 453                         try {
 454                                 $this->main();
 455                         } catch ( ErrorPageError $e ) {
 456                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 457                                 // they are not internal application faults. As with normal requests, this
 458                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 459                                 wfGetLBFactory()->commitMasterChanges();
 460                                 $e->report(); // display the GUI error
 461                         }
 462                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 463                                 fastcgi_finish_request();
 464                         }
 465                         $this->triggerJobs();
 466                         $this->restInPeace();
 467                 } catch ( Exception $e ) {
 468                         MWExceptionHandler::handle( $e );
 469                 }
 470         }
 471
 472         /**
 473          * Checks if the request should abort due to a lagged server,
 474          * for given maxlag parameter.
 475          * @return bool
 476          */
 477         private function checkMaxLag() {
 478                 global $wgShowHostnames;
 479
 480                 wfProfileIn( __METHOD__ );
 481                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 482                 if ( !is_null( $maxLag ) ) {
 483                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 484                         if ( $lag > $maxLag ) {
 485                                 $resp = $this->context->getRequest()->response();
 486                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 487                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 488                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 489                                 $resp->header( 'Content-Type: text/plain' );
 490                                 if ( $wgShowHostnames ) {
 491                                         echo "Waiting for $host: $lag seconds lagged\n";
 492                                 } else {
 493                                         echo "Waiting for a database server: $lag seconds lagged\n";
 494                                 }
 495
 496                                 wfProfileOut( __METHOD__ );
 497
 498                                 exit;
 499                         }
 500                 }
 501                 wfProfileOut( __METHOD__ );
 502                 return true;
 503         }
 504
 505         private function main() {
 506                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 507
 508                 wfProfileIn( __METHOD__ );
 509
 510                 $request = $this->context->getRequest();
 511
 512                 // Send Ajax requests to the Ajax dispatcher.
 513                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 514
 515                         // Set a dummy title, because $wgTitle == null might break things
 516                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 517                         $this->context->setTitle( $title );
 518                         $wgTitle = $title;
 519
 520                         $dispatcher = new AjaxDispatcher();
 521                         $dispatcher->performAction();
 522                         wfProfileOut( __METHOD__ );
 523                         return;
 524                 }
 525
 526                 // Get title from request parameters,
 527                 // is set on the fly by parseTitle the first time.
 528                 $title = $this->getTitle();
 529                 $action = $this->getAction();
 530                 $wgTitle = $title;
 531
 532                 // If the user has forceHTTPS set to true, or if the user
 533                 // is in a group requiring HTTPS, or if they have the HTTPS
 534                 // preference set, redirect them to HTTPS.
 535                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 536                 // isLoggedIn() will do all sorts of weird stuff.
 537                 if (
 538                         $request->getProtocol() == 'http' &&
 539                         (
 540                                 $request->getCookie( 'forceHTTPS', '' ) ||
 541                                 // check for prefixed version for currently logged in users
 542                                 $request->getCookie( 'forceHTTPS' ) ||
 543                                 // Avoid checking the user and groups unless it's enabled.
 544                                 (
 545                                         $this->context->getUser()->isLoggedIn()
 546                                         && $this->context->getUser()->requiresHTTPS()
 547                                 )
 548                         )
 549                 ) {
 550                         $oldUrl = $request->getFullRequestURL();
 551                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 552
 553                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 554                         if ( wfRunHooks( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 555
 556                                 if ( $request->wasPosted() ) {
 557                                         // This is weird and we'd hope it almost never happens. This
 558                                         // means that a POST came in via HTTP and policy requires us
 559                                         // redirecting to HTTPS. It's likely such a request is going
 560                                         // to fail due to post data being lost, but let's try anyway
 561                                         // and just log the instance.
 562                                         //
 563                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 564                                         // to see how clients (automated & browser) behave when we do
 565                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 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
 580                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 581                         wfProfileIn( 'main-try-filecache' );
 582                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 583                                 // Try low-level file cache hit
 584                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 585                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 586                                         // Check incoming headers to see if client has this cached
 587                                         $timestamp = $cache->cacheTimestamp();
 588                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 589                                                 $cache->loadFromFileCache( $this->context );
 590                                         }
 591                                         // Do any stats increment/watchlist stuff
 592                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 593                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 594                                         // Tell OutputPage that output is taken care of
 595                                         $this->context->getOutput()->disable();
 596                                         wfProfileOut( 'main-try-filecache' );
 597                                         wfProfileOut( __METHOD__ );
 598                                         return;
 599                                 }
 600                         }
 601                         wfProfileOut( 'main-try-filecache' );
 602                 }
 603
 604                 // Actually do the work of the request and build up any output
 605                 $this->performRequest();
 606
 607                 // Either all DB and deferred updates should happen or none.
 608                 // The later should not be cancelled due to client disconnect.
 609                 ignore_user_abort( true );
 610                 // Now commit any transactions, so that unreported errors after
 611                 // output() don't roll back the whole DB transaction
 612                 wfGetLBFactory()->commitMasterChanges();
 613
 614                 // Output everything!
 615                 $this->context->getOutput()->output();
 616
 617                 wfProfileOut( __METHOD__ );
 618         }
 619
 620         /**
 621          * Ends this task peacefully
 622          */
 623         public function restInPeace() {
 624                 // Do any deferred jobs
 625                 DeferredUpdates::doUpdates( 'commit' );
 626
 627                 // Log profiling data, e.g. in the database or UDP
 628                 wfLogProfilingData();
 629
 630                 // Commit and close up!
 631                 $factory = wfGetLBFactory();
 632                 $factory->commitMasterChanges();
 633                 $factory->shutdown();
 634
 635                 wfDebug( "Request ended normally\n" );
 636         }
 637
 638         /**
 639          * Potentially open a socket and sent an HTTP request back to the server
 640          * to run a specified number of jobs. This registers a callback to cleanup
 641          * the socket once it's done.
 642          */
 643         protected function triggerJobs() {
 644                 global $wgJobRunRate, $wgServer, $wgRunJobsAsync;
 645
 646                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 647                         return;
 648                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 649                         return; // recursion guard
 650                 }
 651
 652                 $section = new ProfileSection( __METHOD__ );
 653
 654                 if ( $wgJobRunRate < 1 ) {
 655                         $max = mt_getrandmax();
 656                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 657                                 return; // the higher $wgJobRunRate, the less likely we return here
 658                         }
 659                         $n = 1;
 660                 } else {
 661                         $n = intval( $wgJobRunRate );
 662                 }
 663
 664                 if ( !$wgRunJobsAsync ) {
 665                         // Fall back to running the job here while the user waits
 666                         $runner = new JobRunner();
 667                         $runner->run( array( 'maxJobs'  => $n ) );
 668                         return;
 669                 }
 670
 671                 try {
 672                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 673                                 return; // do not send request if there are probably no jobs
 674                         }
 675                 } catch ( JobQueueError $e ) {
 676                         MWExceptionHandler::logException( $e );
 677                         return; // do not make the site unavailable
 678                 }
 679
 680                 $query = array( 'title' => 'Special:RunJobs',
 681                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 682                 $query['signature'] = SpecialRunJobs::getQuerySignature( $query );
 683
 684                 $errno = $errstr = null;
 685                 $info = wfParseUrl( $wgServer );
 686                 wfSuppressWarnings();
 687                 $sock = fsockopen(
 688                         $info['host'],
 689                         isset( $info['port'] ) ? $info['port'] : 80,
 690                         $errno,
 691                         $errstr,
 692                         // If it takes more than 100ms to connect to ourselves there
 693                         // is a problem elsewhere.
 694                         0.1
 695                 );
 696                 wfRestoreWarnings();
 697                 if ( !$sock ) {
 698                         wfDebugLog( 'runJobs', "Failed to start cron API (socket error $errno): $errstr\n" );
 699                         // Fall back to running the job here while the user waits
 700                         $runner = new JobRunner();
 701                         $runner->run( array( 'maxJobs'  => $n ) );
 702                         return;
 703                 }
 704
 705                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 706                 $req = "POST $url HTTP/1.1\r\nHost: {$info['host']}\r\nConnection: Close\r\n\r\n";
 707
 708                 wfDebugLog( 'runJobs', "Running $n job(s) via '$url'\n" );
 709                 // Send a cron API request to be performed in the background.
 710                 // Give up if this takes too long to send (which should be rare).
 711                 stream_set_timeout( $sock, 1 );
 712                 $bytes = fwrite( $sock, $req );
 713                 if ( $bytes !== strlen( $req ) ) {
 714                         wfDebugLog( 'runJobs', "Failed to start cron API (socket write error)\n" );
 715                 } else {
 716                         // Do not wait for the response (the script should handle client aborts).
 717                         // Make sure that we don't close before that script reaches ignore_user_abort().
 718                         $status = fgets( $sock );
 719                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 720                                 wfDebugLog( 'runJobs', "Failed to start cron API: received '$status'\n" );
 721                         }
 722                 }
 723                 fclose( $sock );
 724         }
 725 }