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                 if ( $x ) {
  42                         $this->context->setRequest( $x );
  43                 }
  44                 return $old;
  45         }
  46
  47         /**
  48          * @param null|OutputPage $x
  49          * @return OutputPage
  50          */
  51         public function output( OutputPage $x = null ) {
  52                 $old = $this->context->getOutput();
  53                 if ( $x ) {
  54                         $this->context->setOutput( $x );
  55                 }
  56                 return $old;
  57         }
  58
  59         /**
  60          * @param IContextSource|null $context
  61          */
  62         public function __construct( IContextSource $context = null ) {
  63                 if ( !$context ) {
  64                         $context = RequestContext::getMain();
  65                 }
  66
  67                 $this->context = $context;
  68         }
  69
  70         /**
  71          * Parse the request to get the Title object
  72          *
  73          * @return Title Title object to be $wgTitle
  74          */
  75         private function parseTitle() {
  76                 global $wgContLang;
  77
  78                 $request = $this->context->getRequest();
  79                 $curid = $request->getInt( 'curid' );
  80                 $title = $request->getVal( 'title' );
  81                 $action = $request->getVal( 'action', 'view' );
  82
  83                 if ( $request->getCheck( 'search' ) ) {
  84                         // Compatibility with old search URLs which didn't use Special:Search
  85                         // Just check for presence here, so blank requests still
  86                         // show the search page when using ugly URLs (bug 8054).
  87                         $ret = SpecialPage::getTitleFor( 'Search' );
  88                 } elseif ( $curid ) {
  89                         // URLs like this are generated by RC, because rc_title isn't always accurate
  90                         $ret = Title::newFromID( $curid );
  91                 } else {
  92                         $ret = Title::newFromURL( $title );
  93                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  94                         // in wikitext links to tell Parser to make a direct file link
  95                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  96                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  97                         }
  98                         // Check variant links so that interwiki links don't have to worry
  99                         // about the possible different language variants
 100                         if ( count( $wgContLang->getVariants() ) > 1
 101                                 && !is_null( $ret ) && $ret->getArticleID() == 0
 102                         ) {
 103                                 $wgContLang->findVariantLink( $title, $ret );
 104                         }
 105                 }
 106
 107                 // If title is not provided, always allow oldid and diff to set the title.
 108                 // If title is provided, allow oldid and diff to override the title, unless
 109                 // we are talking about a special page which might use these parameters for
 110                 // other purposes.
 111                 if ( $ret === null || !$ret->isSpecialPage() ) {
 112                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 113                         $oldid = $request->getInt( 'oldid' );
 114                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
 115                         // Allow oldid to override a changed or missing title
 116                         if ( $oldid ) {
 117                                 $rev = Revision::newFromId( $oldid );
 118                                 $ret = $rev ? $rev->getTitle() : $ret;
 119                         }
 120                 }
 121
 122                 // Use the main page as default title if nothing else has been provided
 123                 if ( $ret === null
 124                         && strval( $title ) === ''
 125                         && !$request->getCheck( 'curid' )
 126                         && $action !== 'delete'
 127                 ) {
 128                         $ret = Title::newMainPage();
 129                 }
 130
 131                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 132                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 133                 }
 134
 135                 return $ret;
 136         }
 137
 138         /**
 139          * Get the Title object that we'll be acting on, as specified in the WebRequest
 140          * @return Title
 141          */
 142         public function getTitle() {
 143                 if ( $this->context->getTitle() === null ) {
 144                         $this->context->setTitle( $this->parseTitle() );
 145                 }
 146                 return $this->context->getTitle();
 147         }
 148
 149         /**
 150          * Returns the name of the action that will be executed.
 151          *
 152          * @return string Action
 153          */
 154         public function getAction() {
 155                 static $action = null;
 156
 157                 if ( $action === null ) {
 158                         $action = Action::getActionName( $this->context );
 159                 }
 160
 161                 return $action;
 162         }
 163
 164         /**
 165          * Performs the request.
 166          * - bad titles
 167          * - read restriction
 168          * - local interwiki redirects
 169          * - redirect loop
 170          * - special pages
 171          * - normal pages
 172          *
 173          * @throws MWException|PermissionsError|BadTitleError|HttpError
 174          * @return void
 175          */
 176         private function performRequest() {
 177                 global $wgServer, $wgUsePathInfo, $wgTitle;
 178
 179                 wfProfileIn( __METHOD__ );
 180
 181                 $request = $this->context->getRequest();
 182                 $requestTitle = $title = $this->context->getTitle();
 183                 $output = $this->context->getOutput();
 184                 $user = $this->context->getUser();
 185
 186                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 187                         $output->setPrintable();
 188                 }
 189
 190                 $unused = null; // To pass it by reference
 191                 wfRunHooks( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 192
 193                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 194                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 195                         || $title->isSpecial( 'Badtitle' )
 196                 ) {
 197                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 198                         wfProfileOut( __METHOD__ );
 199                         throw new BadTitleError();
 200                 }
 201
 202                 // Check user's permissions to read this page.
 203                 // We have to check here to catch special pages etc.
 204                 // We will check again in Article::view().
 205                 $permErrors = $title->isSpecial( 'RunJobs' )
 206                         ? array() // relies on HMAC key signature alone
 207                         : $title->getUserPermissionsErrors( 'read', $user );
 208                 if ( count( $permErrors ) ) {
 209                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 210                         // $this->context->title set to the input title would allow anonymous users to
 211                         // determine whether a page exists, potentially leaking private data. In fact, the
 212                         // curid and oldid request  parameters would allow page titles to be enumerated even
 213                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 214                         // permissions error is displayed.
 215                         //
 216                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 217                         // still use $wgTitle.
 218
 219                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 220                         $this->context->setTitle( $badTitle );
 221                         $wgTitle = $badTitle;
 222
 223                         wfProfileOut( __METHOD__ );
 224                         throw new PermissionsError( 'read', $permErrors );
 225                 }
 226
 227                 $pageView = false; // was an article or special page viewed?
 228
 229                 // Interwiki redirects
 230                 if ( $title->isExternal() ) {
 231                         $rdfrom = $request->getVal( 'rdfrom' );
 232                         if ( $rdfrom ) {
 233                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 234                         } else {
 235                                 $query = $request->getValues();
 236                                 unset( $query['title'] );
 237                                 $url = $title->getFullURL( $query );
 238                         }
 239                         // Check for a redirect loop
 240                         if ( !preg_match( '/^' . preg_quote( $wgServer, '/' ) . '/', $url )
 241                                 && $title->isLocal()
 242                         ) {
 243                                 // 301 so google et al report the target as the actual url.
 244                                 $output->redirect( $url, 301 );
 245                         } else {
 246                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 247                                 wfProfileOut( __METHOD__ );
 248                                 throw new BadTitleError();
 249                         }
 250                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 251                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 252                         && ( $request->getVal( 'title' ) === null
 253                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 254                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 255                         && wfRunHooks( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 256                 ) {
 257                         if ( $title->isSpecialPage() ) {
 258                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 259                                 if ( $name ) {
 260                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 261                                 }
 262                         }
 263                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 264                         // Redirect to canonical url, make it a 301 to allow caching
 265                         if ( $targetUrl == $request->getFullRequestURL() ) {
 266                                 $message = "Redirect loop detected!\n\n" .
 267                                         "This means the wiki got confused about what page was " .
 268                                         "requested; this sometimes happens when moving a wiki " .
 269                                         "to a new server or changing the server configuration.\n\n";
 270
 271                                 if ( $wgUsePathInfo ) {
 272                                         $message .= "The wiki is trying to interpret the page " .
 273                                                 "title from the URL path portion (PATH_INFO), which " .
 274                                                 "sometimes fails depending on the web server. Try " .
 275                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 276                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 277                                                 "is correct.";
 278                                 } else {
 279                                         $message .= "Your web server was detected as possibly not " .
 280                                                 "supporting URL path components (PATH_INFO) correctly; " .
 281                                                 "check your LocalSettings.php for a customized " .
 282                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 283                                                 "to true.";
 284                                 }
 285                                 throw new HttpError( 500, $message );
 286                         } else {
 287                                 $output->setSquidMaxage( 1200 );
 288                                 $output->redirect( $targetUrl, '301' );
 289                         }
 290                 // Special pages
 291                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 292                         $pageView = true;
 293                         // Actions that need to be made when we have a special pages
 294                         SpecialPageFactory::executePath( $title, $this->context );
 295                 } else {
 296                         // ...otherwise treat it as an article view. The article
 297                         // may be a redirect to another article or URL.
 298                         $article = $this->initializeArticle();
 299                         if ( is_object( $article ) ) {
 300                                 $pageView = true;
 301                                 $this->performAction( $article, $requestTitle );
 302                         } elseif ( is_string( $article ) ) {
 303                                 $output->redirect( $article );
 304                         } else {
 305                                 wfProfileOut( __METHOD__ );
 306                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 307                                         . " returned neither an object nor a URL" );
 308                         }
 309                 }
 310
 311                 if ( $pageView ) {
 312                         // Promote user to any groups they meet the criteria for
 313                         $user->addAutopromoteOnceGroups( 'onView' );
 314                 }
 315
 316                 wfProfileOut( __METHOD__ );
 317         }
 318
 319         /**
 320          * Initialize the main Article object for "standard" actions (view, etc)
 321          * Create an Article object for the page, following redirects if needed.
 322          *
 323          * @return mixed An Article, or a string to redirect to another URL
 324          */
 325         private function initializeArticle() {
 326                 global $wgDisableHardRedirects;
 327
 328                 wfProfileIn( __METHOD__ );
 329
 330                 $title = $this->context->getTitle();
 331                 if ( $this->context->canUseWikiPage() ) {
 332                         // Try to use request context wiki page, as there
 333                         // is already data from db saved in per process
 334                         // cache there from this->getAction() call.
 335                         $page = $this->context->getWikiPage();
 336                         $article = Article::newFromWikiPage( $page, $this->context );
 337                 } else {
 338                         // This case should not happen, but just in case.
 339                         $article = Article::newFromTitle( $title, $this->context );
 340                         $this->context->setWikiPage( $article->getPage() );
 341                 }
 342
 343                 // NS_MEDIAWIKI has no redirects.
 344                 // It is also used for CSS/JS, so performance matters here...
 345                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 346                         wfProfileOut( __METHOD__ );
 347                         return $article;
 348                 }
 349
 350                 $request = $this->context->getRequest();
 351
 352                 // Namespace might change when using redirects
 353                 // Check for redirects ...
 354                 $action = $request->getVal( 'action', 'view' );
 355                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 356                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 357                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 358                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 359                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 360                         // ... and the article is not a non-redirect image page with associated file
 361                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 362                 ) {
 363                         // Give extensions a change to ignore/handle redirects as needed
 364                         $ignoreRedirect = $target = false;
 365
 366                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 367                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 368
 369                         // Follow redirects only for... redirects.
 370                         // If $target is set, then a hook wanted to redirect.
 371                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 372                                 // Is the target already set by an extension?
 373                                 $target = $target ? $target : $article->followRedirect();
 374                                 if ( is_string( $target ) ) {
 375                                         if ( !$wgDisableHardRedirects ) {
 376                                                 // we'll need to redirect
 377                                                 wfProfileOut( __METHOD__ );
 378                                                 return $target;
 379                                         }
 380                                 }
 381                                 if ( is_object( $target ) ) {
 382                                         // Rewrite environment to redirected article
 383                                         $rarticle = Article::newFromTitle( $target, $this->context );
 384                                         $rarticle->loadPageData();
 385                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 386                                                 $rarticle->setRedirectedFrom( $title );
 387                                                 $article = $rarticle;
 388                                                 $this->context->setTitle( $target );
 389                                                 $this->context->setWikiPage( $article->getPage() );
 390                                         }
 391                                 }
 392                         } else {
 393                                 $this->context->setTitle( $article->getTitle() );
 394                                 $this->context->setWikiPage( $article->getPage() );
 395                         }
 396                 }
 397
 398                 wfProfileOut( __METHOD__ );
 399                 return $article;
 400         }
 401
 402         /**
 403          * Perform one of the "standard" actions
 404          *
 405          * @param Page $page
 406          * @param Title $requestTitle The original title, before any redirects were applied
 407          */
 408         private function performAction( Page $page, Title $requestTitle ) {
 409                 global $wgUseSquid, $wgSquidMaxage;
 410
 411                 wfProfileIn( __METHOD__ );
 412
 413                 $request = $this->context->getRequest();
 414                 $output = $this->context->getOutput();
 415                 $title = $this->context->getTitle();
 416                 $user = $this->context->getUser();
 417
 418                 if ( !wfRunHooks( 'MediaWikiPerformAction',
 419                                 array( $output, $page, $title, $user, $request, $this ) )
 420                 ) {
 421                         wfProfileOut( __METHOD__ );
 422                         return;
 423                 }
 424
 425                 $act = $this->getAction();
 426
 427                 $action = Action::factory( $act, $page, $this->context );
 428
 429                 if ( $action instanceof Action ) {
 430                         # Let Squid cache things if we can purge them.
 431                         if ( $wgUseSquid &&
 432                                 in_array( $request->getFullRequestURL(), $requestTitle->getSquidURLs() )
 433                         ) {
 434                                 $output->setSquidMaxage( $wgSquidMaxage );
 435                         }
 436
 437                         $action->show();
 438                         wfProfileOut( __METHOD__ );
 439                         return;
 440                 }
 441
 442                 if ( wfRunHooks( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 443                         $output->setStatusCode( 404 );
 444                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 445                 }
 446
 447                 wfProfileOut( __METHOD__ );
 448         }
 449
 450         /**
 451          * Run the current MediaWiki instance
 452          * index.php just calls this
 453          */
 454         public function run() {
 455                 try {
 456                         $this->checkMaxLag();
 457                         try {
 458                                 $this->main();
 459                         } catch ( ErrorPageError $e ) {
 460                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 461                                 // they are not internal application faults. As with normal requests, this
 462                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 463                                 wfGetLBFactory()->commitMasterChanges();
 464                                 $e->report(); // display the GUI error
 465                         }
 466                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 467                                 fastcgi_finish_request();
 468                         }
 469                         $this->triggerJobs();
 470                         $this->restInPeace();
 471                 } catch ( Exception $e ) {
 472                         MWExceptionHandler::handle( $e );
 473                 }
 474         }
 475
 476         /**
 477          * Checks if the request should abort due to a lagged server,
 478          * for given maxlag parameter.
 479          * @return bool
 480          */
 481         private function checkMaxLag() {
 482                 global $wgShowHostnames;
 483
 484                 wfProfileIn( __METHOD__ );
 485                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 486                 if ( !is_null( $maxLag ) ) {
 487                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 488                         if ( $lag > $maxLag ) {
 489                                 $resp = $this->context->getRequest()->response();
 490                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 491                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 492                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 493                                 $resp->header( 'Content-Type: text/plain' );
 494                                 if ( $wgShowHostnames ) {
 495                                         echo "Waiting for $host: $lag seconds lagged\n";
 496                                 } else {
 497                                         echo "Waiting for a database server: $lag seconds lagged\n";
 498                                 }
 499
 500                                 wfProfileOut( __METHOD__ );
 501
 502                                 exit;
 503                         }
 504                 }
 505                 wfProfileOut( __METHOD__ );
 506                 return true;
 507         }
 508
 509         private function main() {
 510                 global $wgUseFileCache, $wgTitle, $wgUseAjax;
 511
 512                 wfProfileIn( __METHOD__ );
 513
 514                 $request = $this->context->getRequest();
 515
 516                 // Send Ajax requests to the Ajax dispatcher.
 517                 if ( $wgUseAjax && $request->getVal( 'action', 'view' ) == 'ajax' ) {
 518
 519                         // Set a dummy title, because $wgTitle == null might break things
 520                         $title = Title::makeTitle( NS_MAIN, 'AJAX' );
 521                         $this->context->setTitle( $title );
 522                         $wgTitle = $title;
 523
 524                         $dispatcher = new AjaxDispatcher();
 525                         $dispatcher->performAction();
 526                         wfProfileOut( __METHOD__ );
 527                         return;
 528                 }
 529
 530                 // Get title from request parameters,
 531                 // is set on the fly by parseTitle the first time.
 532                 $title = $this->getTitle();
 533                 $action = $this->getAction();
 534                 $wgTitle = $title;
 535
 536                 // If the user has forceHTTPS set to true, or if the user
 537                 // is in a group requiring HTTPS, or if they have the HTTPS
 538                 // preference set, redirect them to HTTPS.
 539                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 540                 // isLoggedIn() will do all sorts of weird stuff.
 541                 if (
 542                         $request->getProtocol() == 'http' &&
 543                         (
 544                                 $request->getCookie( 'forceHTTPS', '' ) ||
 545                                 // check for prefixed version for currently logged in users
 546                                 $request->getCookie( 'forceHTTPS' ) ||
 547                                 // Avoid checking the user and groups unless it's enabled.
 548                                 (
 549                                         $this->context->getUser()->isLoggedIn()
 550                                         && $this->context->getUser()->requiresHTTPS()
 551                                 )
 552                         )
 553                 ) {
 554                         $oldUrl = $request->getFullRequestURL();
 555                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 556
 557                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 558                         if ( wfRunHooks( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 559
 560                                 if ( $request->wasPosted() ) {
 561                                         // This is weird and we'd hope it almost never happens. This
 562                                         // means that a POST came in via HTTP and policy requires us
 563                                         // redirecting to HTTPS. It's likely such a request is going
 564                                         // to fail due to post data being lost, but let's try anyway
 565                                         // and just log the instance.
 566                                         //
 567                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 568                                         // to see how clients (automated & browser) behave when we do
 569                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 570                                 }
 571                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 572                                 $title = Title::newFromText( NS_MAIN, 'REDIR' );
 573                                 $this->context->setTitle( $title );
 574                                 $output = $this->context->getOutput();
 575                                 // Since we only do this redir to change proto, always send a vary header
 576                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 577                                 $output->redirect( $redirUrl );
 578                                 $output->output();
 579                                 wfProfileOut( __METHOD__ );
 580                                 return;
 581                         }
 582                 }
 583
 584                 if ( $wgUseFileCache && $title->getNamespace() >= 0 ) {
 585                         wfProfileIn( 'main-try-filecache' );
 586                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 587                                 // Try low-level file cache hit
 588                                 $cache = HTMLFileCache::newFromTitle( $title, $action );
 589                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 590                                         // Check incoming headers to see if client has this cached
 591                                         $timestamp = $cache->cacheTimestamp();
 592                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 593                                                 $cache->loadFromFileCache( $this->context );
 594                                         }
 595                                         // Do any stats increment/watchlist stuff
 596                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 597                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 598                                         // Tell OutputPage that output is taken care of
 599                                         $this->context->getOutput()->disable();
 600                                         wfProfileOut( 'main-try-filecache' );
 601                                         wfProfileOut( __METHOD__ );
 602                                         return;
 603                                 }
 604                         }
 605                         wfProfileOut( 'main-try-filecache' );
 606                 }
 607
 608                 // Actually do the work of the request and build up any output
 609                 $this->performRequest();
 610
 611                 // Either all DB and deferred updates should happen or none.
 612                 // The later should not be cancelled due to client disconnect.
 613                 ignore_user_abort( true );
 614                 // Now commit any transactions, so that unreported errors after
 615                 // output() don't roll back the whole DB transaction
 616                 wfGetLBFactory()->commitMasterChanges();
 617
 618                 // Output everything!
 619                 $this->context->getOutput()->output();
 620
 621                 wfProfileOut( __METHOD__ );
 622         }
 623
 624         /**
 625          * Ends this task peacefully
 626          */
 627         public function restInPeace() {
 628                 // Do any deferred jobs
 629                 DeferredUpdates::doUpdates( 'commit' );
 630
 631                 // Log profiling data, e.g. in the database or UDP
 632                 wfLogProfilingData();
 633
 634                 // Commit and close up!
 635                 $factory = wfGetLBFactory();
 636                 $factory->commitMasterChanges();
 637                 $factory->shutdown();
 638
 639                 wfDebug( "Request ended normally\n" );
 640         }
 641
 642         /**
 643          * Potentially open a socket and sent an HTTP request back to the server
 644          * to run a specified number of jobs. This registers a callback to cleanup
 645          * the socket once it's done.
 646          */
 647         protected function triggerJobs() {
 648                 global $wgJobRunRate, $wgServer, $wgRunJobsAsync;
 649
 650                 if ( $wgJobRunRate <= 0 || wfReadOnly() ) {
 651                         return;
 652                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 653                         return; // recursion guard
 654                 }
 655
 656                 $section = new ProfileSection( __METHOD__ );
 657
 658                 if ( $wgJobRunRate < 1 ) {
 659                         $max = mt_getrandmax();
 660                         if ( mt_rand( 0, $max ) > $max * $wgJobRunRate ) {
 661                                 return; // the higher $wgJobRunRate, the less likely we return here
 662                         }
 663                         $n = 1;
 664                 } else {
 665                         $n = intval( $wgJobRunRate );
 666                 }
 667
 668                 if ( !$wgRunJobsAsync ) {
 669                         // Fall back to running the job here while the user waits
 670                         $runner = new JobRunner();
 671                         $runner->run( array( 'maxJobs'  => $n ) );
 672                         return;
 673                 }
 674
 675                 try {
 676                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 677                                 return; // do not send request if there are probably no jobs
 678                         }
 679                 } catch ( JobQueueError $e ) {
 680                         MWExceptionHandler::logException( $e );
 681                         return; // do not make the site unavailable
 682                 }
 683
 684                 $query = array( 'title' => 'Special:RunJobs',
 685                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 686                 $query['signature'] = SpecialRunJobs::getQuerySignature( $query );
 687
 688                 $errno = $errstr = null;
 689                 $info = wfParseUrl( $wgServer );
 690                 wfSuppressWarnings();
 691                 $sock = fsockopen(
 692                         $info['host'],
 693                         isset( $info['port'] ) ? $info['port'] : 80,
 694                         $errno,
 695                         $errstr,
 696                         // If it takes more than 100ms to connect to ourselves there
 697                         // is a problem elsewhere.
 698                         0.1
 699                 );
 700                 wfRestoreWarnings();
 701                 if ( !$sock ) {
 702                         wfDebugLog( 'runJobs', "Failed to start cron API (socket error $errno): $errstr\n" );
 703                         // Fall back to running the job here while the user waits
 704                         $runner = new JobRunner();
 705                         $runner->run( array( 'maxJobs'  => $n ) );
 706                         return;
 707                 }
 708
 709                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 710                 $req = "POST $url HTTP/1.1\r\nHost: {$info['host']}\r\nConnection: Close\r\n\r\n";
 711
 712                 wfDebugLog( 'runJobs', "Running $n job(s) via '$url'\n" );
 713                 // Send a cron API request to be performed in the background.
 714                 // Give up if this takes too long to send (which should be rare).
 715                 stream_set_timeout( $sock, 1 );
 716                 $bytes = fwrite( $sock, $req );
 717                 if ( $bytes !== strlen( $req ) ) {
 718                         wfDebugLog( 'runJobs', "Failed to start cron API (socket write error)\n" );
 719                 } else {
 720                         // Do not wait for the response (the script should handle client aborts).
 721                         // Make sure that we don't close before that script reaches ignore_user_abort().
 722                         $status = fgets( $sock );
 723                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 724                                 wfDebugLog( 'runJobs', "Failed to start cron API: received '$status'\n" );
 725                         }
 726                 }
 727                 fclose( $sock );
 728         }
 729 }