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 use MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * The MediaWiki class is the helper class for the index.php entry point.
  27  */
  28 class MediaWiki {
  29         /**
  30          * @var IContextSource
  31          */
  32         private $context;
  33
  34         /**
  35          * @var Config
  36          */
  37         private $config;
  38
  39         /**
  40          * @param IContextSource|null $context
  41          */
  42         public function __construct( IContextSource $context = null ) {
  43                 if ( !$context ) {
  44                         $context = RequestContext::getMain();
  45                 }
  46
  47                 $this->context = $context;
  48                 $this->config = $context->getConfig();
  49         }
  50
  51         /**
  52          * Parse the request to get the Title object
  53          *
  54          * @return Title Title object to be $wgTitle
  55          */
  56         private function parseTitle() {
  57                 global $wgContLang;
  58
  59                 $request = $this->context->getRequest();
  60                 $curid = $request->getInt( 'curid' );
  61                 $title = $request->getVal( 'title' );
  62                 $action = $request->getVal( 'action' );
  63
  64                 if ( $request->getCheck( 'search' ) ) {
  65                         // Compatibility with old search URLs which didn't use Special:Search
  66                         // Just check for presence here, so blank requests still
  67                         // show the search page when using ugly URLs (bug 8054).
  68                         $ret = SpecialPage::getTitleFor( 'Search' );
  69                 } elseif ( $curid ) {
  70                         // URLs like this are generated by RC, because rc_title isn't always accurate
  71                         $ret = Title::newFromID( $curid );
  72                 } else {
  73                         $ret = Title::newFromURL( $title );
  74                         // Alias NS_MEDIA page URLs to NS_FILE...we only use NS_MEDIA
  75                         // in wikitext links to tell Parser to make a direct file link
  76                         if ( !is_null( $ret ) && $ret->getNamespace() == NS_MEDIA ) {
  77                                 $ret = Title::makeTitle( NS_FILE, $ret->getDBkey() );
  78                         }
  79                         // Check variant links so that interwiki links don't have to worry
  80                         // about the possible different language variants
  81                         if ( count( $wgContLang->getVariants() ) > 1
  82                                 && !is_null( $ret ) && $ret->getArticleID() == 0
  83                         ) {
  84                                 $wgContLang->findVariantLink( $title, $ret );
  85                         }
  86                 }
  87
  88                 // If title is not provided, always allow oldid and diff to set the title.
  89                 // If title is provided, allow oldid and diff to override the title, unless
  90                 // we are talking about a special page which might use these parameters for
  91                 // other purposes.
  92                 if ( $ret === null || !$ret->isSpecialPage() ) {
  93                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
  94                         $oldid = $request->getInt( 'oldid' );
  95                         $oldid = $oldid ? $oldid : $request->getInt( 'diff' );
  96                         // Allow oldid to override a changed or missing title
  97                         if ( $oldid ) {
  98                                 $rev = Revision::newFromId( $oldid );
  99                                 $ret = $rev ? $rev->getTitle() : $ret;
 100                         }
 101                 }
 102
 103                 // Use the main page as default title if nothing else has been provided
 104                 if ( $ret === null
 105                         && strval( $title ) === ''
 106                         && !$request->getCheck( 'curid' )
 107                         && $action !== 'delete'
 108                 ) {
 109                         $ret = Title::newMainPage();
 110                 }
 111
 112                 if ( $ret === null || ( $ret->getDBkey() == '' && !$ret->isExternal() ) ) {
 113                         $ret = SpecialPage::getTitleFor( 'Badtitle' );
 114                 }
 115
 116                 return $ret;
 117         }
 118
 119         /**
 120          * Get the Title object that we'll be acting on, as specified in the WebRequest
 121          * @return Title
 122          */
 123         public function getTitle() {
 124                 if ( !$this->context->hasTitle() ) {
 125                         $this->context->setTitle( $this->parseTitle() );
 126                 }
 127                 return $this->context->getTitle();
 128         }
 129
 130         /**
 131          * Returns the name of the action that will be executed.
 132          *
 133          * @return string Action
 134          */
 135         public function getAction() {
 136                 static $action = null;
 137
 138                 if ( $action === null ) {
 139                         $action = Action::getActionName( $this->context );
 140                 }
 141
 142                 return $action;
 143         }
 144
 145         /**
 146          * Performs the request.
 147          * - bad titles
 148          * - read restriction
 149          * - local interwiki redirects
 150          * - redirect loop
 151          * - special pages
 152          * - normal pages
 153          *
 154          * @throws MWException|PermissionsError|BadTitleError|HttpError
 155          * @return void
 156          */
 157         private function performRequest() {
 158                 global $wgTitle;
 159
 160                 $request = $this->context->getRequest();
 161                 $requestTitle = $title = $this->context->getTitle();
 162                 $output = $this->context->getOutput();
 163                 $user = $this->context->getUser();
 164
 165                 if ( $request->getVal( 'printable' ) === 'yes' ) {
 166                         $output->setPrintable();
 167                 }
 168
 169                 $unused = null; // To pass it by reference
 170                 Hooks::run( 'BeforeInitialize', array( &$title, &$unused, &$output, &$user, $request, $this ) );
 171
 172                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 173                 if ( is_null( $title ) || ( $title->getDBkey() == '' && !$title->isExternal() )
 174                         || $title->isSpecial( 'Badtitle' )
 175                 ) {
 176                         $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 177                         throw new BadTitleError();
 178                 }
 179
 180                 // Check user's permissions to read this page.
 181                 // We have to check here to catch special pages etc.
 182                 // We will check again in Article::view().
 183                 $permErrors = $title->isSpecial( 'RunJobs' )
 184                         ? array() // relies on HMAC key signature alone
 185                         : $title->getUserPermissionsErrors( 'read', $user );
 186                 if ( count( $permErrors ) ) {
 187                         // Bug 32276: allowing the skin to generate output with $wgTitle or
 188                         // $this->context->title set to the input title would allow anonymous users to
 189                         // determine whether a page exists, potentially leaking private data. In fact, the
 190                         // curid and oldid request  parameters would allow page titles to be enumerated even
 191                         // when they are not guessable. So we reset the title to Special:Badtitle before the
 192                         // permissions error is displayed.
 193                         //
 194                         // The skin mostly uses $this->context->getTitle() these days, but some extensions
 195                         // still use $wgTitle.
 196
 197                         $badTitle = SpecialPage::getTitleFor( 'Badtitle' );
 198                         $this->context->setTitle( $badTitle );
 199                         $wgTitle = $badTitle;
 200
 201                         throw new PermissionsError( 'read', $permErrors );
 202                 }
 203
 204                 // Interwiki redirects
 205                 if ( $title->isExternal() ) {
 206                         $rdfrom = $request->getVal( 'rdfrom' );
 207                         if ( $rdfrom ) {
 208                                 $url = $title->getFullURL( array( 'rdfrom' => $rdfrom ) );
 209                         } else {
 210                                 $query = $request->getValues();
 211                                 unset( $query['title'] );
 212                                 $url = $title->getFullURL( $query );
 213                         }
 214                         // Check for a redirect loop
 215                         if ( !preg_match( '/^' . preg_quote( $this->config->get( 'Server' ), '/' ) . '/', $url )
 216                                 && $title->isLocal()
 217                         ) {
 218                                 // 301 so google et al report the target as the actual url.
 219                                 $output->redirect( $url, 301 );
 220                         } else {
 221                                 $this->context->setTitle( SpecialPage::getTitleFor( 'Badtitle' ) );
 222                                 throw new BadTitleError();
 223                         }
 224                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 225                 } elseif ( $request->getVal( 'action', 'view' ) == 'view' && !$request->wasPosted()
 226                         && ( $request->getVal( 'title' ) === null
 227                                 || $title->getPrefixedDBkey() != $request->getVal( 'title' ) )
 228                         && !count( $request->getValueNames( array( 'action', 'title' ) ) )
 229                         && Hooks::run( 'TestCanonicalRedirect', array( $request, $title, $output ) )
 230                 ) {
 231                         if ( $title->isSpecialPage() ) {
 232                                 list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 233                                 if ( $name ) {
 234                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 235                                 }
 236                         }
 237                         $targetUrl = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
 238                         // Redirect to canonical url, make it a 301 to allow caching
 239                         if ( $targetUrl == $request->getFullRequestURL() ) {
 240                                 $message = "Redirect loop detected!\n\n" .
 241                                         "This means the wiki got confused about what page was " .
 242                                         "requested; this sometimes happens when moving a wiki " .
 243                                         "to a new server or changing the server configuration.\n\n";
 244
 245                                 if ( $this->config->get( 'UsePathInfo' ) ) {
 246                                         $message .= "The wiki is trying to interpret the page " .
 247                                                 "title from the URL path portion (PATH_INFO), which " .
 248                                                 "sometimes fails depending on the web server. Try " .
 249                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 250                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 251                                                 "is correct.";
 252                                 } else {
 253                                         $message .= "Your web server was detected as possibly not " .
 254                                                 "supporting URL path components (PATH_INFO) correctly; " .
 255                                                 "check your LocalSettings.php for a customized " .
 256                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 257                                                 "to true.";
 258                                 }
 259                                 throw new HttpError( 500, $message );
 260                         } else {
 261                                 $output->setSquidMaxage( 1200 );
 262                                 $output->redirect( $targetUrl, '301' );
 263                         }
 264                 // Special pages
 265                 } elseif ( NS_SPECIAL == $title->getNamespace() ) {
 266                         // Actions that need to be made when we have a special pages
 267                         SpecialPageFactory::executePath( $title, $this->context );
 268                 } else {
 269                         // ...otherwise treat it as an article view. The article
 270                         // may be a redirect to another article or URL.
 271                         $article = $this->initializeArticle();
 272                         if ( is_object( $article ) ) {
 273                                 $this->performAction( $article, $requestTitle );
 274                         } elseif ( is_string( $article ) ) {
 275                                 $output->redirect( $article );
 276                         } else {
 277                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle()"
 278                                         . " returned neither an object nor a URL" );
 279                         }
 280                 }
 281         }
 282
 283         /**
 284          * Initialize the main Article object for "standard" actions (view, etc)
 285          * Create an Article object for the page, following redirects if needed.
 286          *
 287          * @return mixed An Article, or a string to redirect to another URL
 288          */
 289         private function initializeArticle() {
 290
 291                 $title = $this->context->getTitle();
 292                 if ( $this->context->canUseWikiPage() ) {
 293                         // Try to use request context wiki page, as there
 294                         // is already data from db saved in per process
 295                         // cache there from this->getAction() call.
 296                         $page = $this->context->getWikiPage();
 297                         $article = Article::newFromWikiPage( $page, $this->context );
 298                 } else {
 299                         // This case should not happen, but just in case.
 300                         $article = Article::newFromTitle( $title, $this->context );
 301                         $this->context->setWikiPage( $article->getPage() );
 302                 }
 303
 304                 // NS_MEDIAWIKI has no redirects.
 305                 // It is also used for CSS/JS, so performance matters here...
 306                 if ( $title->getNamespace() == NS_MEDIAWIKI ) {
 307                         return $article;
 308                 }
 309
 310                 $request = $this->context->getRequest();
 311
 312                 // Namespace might change when using redirects
 313                 // Check for redirects ...
 314                 $action = $request->getVal( 'action', 'view' );
 315                 $file = ( $title->getNamespace() == NS_FILE ) ? $article->getFile() : null;
 316                 if ( ( $action == 'view' || $action == 'render' ) // ... for actions that show content
 317                         && !$request->getVal( 'oldid' ) // ... and are not old revisions
 318                         && !$request->getVal( 'diff' ) // ... and not when showing diff
 319                         && $request->getVal( 'redirect' ) != 'no' // ... unless explicitly told not to
 320                         // ... and the article is not a non-redirect image page with associated file
 321                         && !( is_object( $file ) && $file->exists() && !$file->getRedirected() )
 322                 ) {
 323                         // Give extensions a change to ignore/handle redirects as needed
 324                         $ignoreRedirect = $target = false;
 325
 326                         Hooks::run( 'InitializeArticleMaybeRedirect',
 327                                 array( &$title, &$request, &$ignoreRedirect, &$target, &$article ) );
 328
 329                         // Follow redirects only for... redirects.
 330                         // If $target is set, then a hook wanted to redirect.
 331                         if ( !$ignoreRedirect && ( $target || $article->isRedirect() ) ) {
 332                                 // Is the target already set by an extension?
 333                                 $target = $target ? $target : $article->followRedirect();
 334                                 if ( is_string( $target ) ) {
 335                                         if ( !$this->config->get( 'DisableHardRedirects' ) ) {
 336                                                 // we'll need to redirect
 337                                                 return $target;
 338                                         }
 339                                 }
 340                                 if ( is_object( $target ) ) {
 341                                         // Rewrite environment to redirected article
 342                                         $rarticle = Article::newFromTitle( $target, $this->context );
 343                                         $rarticle->loadPageData();
 344                                         if ( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 345                                                 $rarticle->setRedirectedFrom( $title );
 346                                                 $article = $rarticle;
 347                                                 $this->context->setTitle( $target );
 348                                                 $this->context->setWikiPage( $article->getPage() );
 349                                         }
 350                                 }
 351                         } else {
 352                                 $this->context->setTitle( $article->getTitle() );
 353                                 $this->context->setWikiPage( $article->getPage() );
 354                         }
 355                 }
 356
 357                 return $article;
 358         }
 359
 360         /**
 361          * Perform one of the "standard" actions
 362          *
 363          * @param Page $page
 364          * @param Title $requestTitle The original title, before any redirects were applied
 365          */
 366         private function performAction( Page $page, Title $requestTitle ) {
 367
 368                 $request = $this->context->getRequest();
 369                 $output = $this->context->getOutput();
 370                 $title = $this->context->getTitle();
 371                 $user = $this->context->getUser();
 372
 373                 if ( !Hooks::run( 'MediaWikiPerformAction',
 374                                 array( $output, $page, $title, $user, $request, $this ) )
 375                 ) {
 376                         return;
 377                 }
 378
 379                 $act = $this->getAction();
 380
 381                 $action = Action::factory( $act, $page, $this->context );
 382
 383                 if ( $action instanceof Action ) {
 384                         # Let Squid cache things if we can purge them.
 385                         if ( $this->config->get( 'UseSquid' ) &&
 386                                 in_array(
 387                                         // Use PROTO_INTERNAL because that's what getSquidURLs() uses
 388                                         wfExpandUrl( $request->getRequestURL(), PROTO_INTERNAL ),
 389                                         $requestTitle->getSquidURLs()
 390                                 )
 391                         ) {
 392                                 $output->setSquidMaxage( $this->config->get( 'SquidMaxage' ) );
 393                         }
 394
 395                         $action->show();
 396                         return;
 397                 }
 398
 399                 if ( Hooks::run( 'UnknownAction', array( $request->getVal( 'action', 'view' ), $page ) ) ) {
 400                         $output->setStatusCode( 404 );
 401                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 402                 }
 403
 404         }
 405
 406         /**
 407          * Run the current MediaWiki instance
 408          * index.php just calls this
 409          */
 410         public function run() {
 411                 try {
 412                         $this->checkMaxLag();
 413                         try {
 414                                 $this->main();
 415                         } catch ( ErrorPageError $e ) {
 416                                 // Bug 62091: while exceptions are convenient to bubble up GUI errors,
 417                                 // they are not internal application faults. As with normal requests, this
 418                                 // should commit, print the output, do deferred updates, jobs, and profiling.
 419                                 wfGetLBFactory()->commitMasterChanges();
 420                                 $e->report(); // display the GUI error
 421                         }
 422                         if ( function_exists( 'fastcgi_finish_request' ) ) {
 423                                 fastcgi_finish_request();
 424                         }
 425                         $this->triggerJobs();
 426                         $this->restInPeace();
 427                 } catch ( Exception $e ) {
 428                         MWExceptionHandler::handleException( $e );
 429                 }
 430         }
 431
 432         /**
 433          * Checks if the request should abort due to a lagged server,
 434          * for given maxlag parameter.
 435          * @return bool
 436          */
 437         private function checkMaxLag() {
 438                 $maxLag = $this->context->getRequest()->getVal( 'maxlag' );
 439                 if ( !is_null( $maxLag ) ) {
 440                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 441                         if ( $lag > $maxLag ) {
 442                                 $resp = $this->context->getRequest()->response();
 443                                 $resp->header( 'HTTP/1.1 503 Service Unavailable' );
 444                                 $resp->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 445                                 $resp->header( 'X-Database-Lag: ' . intval( $lag ) );
 446                                 $resp->header( 'Content-Type: text/plain' );
 447                                 if ( $this->config->get( 'ShowHostnames' ) ) {
 448                                         echo "Waiting for $host: $lag seconds lagged\n";
 449                                 } else {
 450                                         echo "Waiting for a database server: $lag seconds lagged\n";
 451                                 }
 452
 453                                 exit;
 454                         }
 455                 }
 456                 return true;
 457         }
 458
 459         private function main() {
 460                 global $wgTitle;
 461
 462                 $request = $this->context->getRequest();
 463
 464                 // Send Ajax requests to the Ajax dispatcher.
 465                 if ( $this->config->get( 'UseAjax' ) && $request->getVal( 'action' ) === 'ajax' ) {
 466                         // Set a dummy title, because $wgTitle == null might break things
 467                         $title = Title::makeTitle( NS_SPECIAL, 'Badtitle/performing an AJAX call in '
 468                                 . __METHOD__
 469                         );
 470                         $this->context->setTitle( $title );
 471                         $wgTitle = $title;
 472
 473                         $dispatcher = new AjaxDispatcher( $this->config );
 474                         $dispatcher->performAction( $this->context->getUser() );
 475                         return;
 476                 }
 477
 478                 // Get title from request parameters,
 479                 // is set on the fly by parseTitle the first time.
 480                 $title = $this->getTitle();
 481                 $action = $this->getAction();
 482                 $wgTitle = $title;
 483
 484                 $trxProfiler = Profiler::instance()->getTransactionProfiler();
 485                 $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
 486
 487                 // Aside from rollback, master queries should not happen on GET requests.
 488                 // Periodic or "in passing" updates on GET should use the job queue.
 489                 if ( !$request->wasPosted()
 490                         && in_array( $action, array( 'view', 'edit', 'history' ) )
 491                 ) {
 492                         $trxProfiler->setExpectation( 'masterConns', 0, __METHOD__ );
 493                         $trxProfiler->setExpectation( 'writes', 0, __METHOD__ );
 494                 } else {
 495                         $trxProfiler->setExpectation( 'maxAffected', 500, __METHOD__ );
 496                 }
 497
 498                 // If the user has forceHTTPS set to true, or if the user
 499                 // is in a group requiring HTTPS, or if they have the HTTPS
 500                 // preference set, redirect them to HTTPS.
 501                 // Note: Do this after $wgTitle is setup, otherwise the hooks run from
 502                 // isLoggedIn() will do all sorts of weird stuff.
 503                 if (
 504                         $request->getProtocol() == 'http' &&
 505                         (
 506                                 $request->getCookie( 'forceHTTPS', '' ) ||
 507                                 // check for prefixed version for currently logged in users
 508                                 $request->getCookie( 'forceHTTPS' ) ||
 509                                 // Avoid checking the user and groups unless it's enabled.
 510                                 (
 511                                         $this->context->getUser()->isLoggedIn()
 512                                         && $this->context->getUser()->requiresHTTPS()
 513                                 )
 514                         )
 515                 ) {
 516                         $oldUrl = $request->getFullRequestURL();
 517                         $redirUrl = preg_replace( '#^http://#', 'https://', $oldUrl );
 518
 519                         // ATTENTION: This hook is likely to be removed soon due to overall design of the system.
 520                         if ( Hooks::run( 'BeforeHttpsRedirect', array( $this->context, &$redirUrl ) ) ) {
 521
 522                                 if ( $request->wasPosted() ) {
 523                                         // This is weird and we'd hope it almost never happens. This
 524                                         // means that a POST came in via HTTP and policy requires us
 525                                         // redirecting to HTTPS. It's likely such a request is going
 526                                         // to fail due to post data being lost, but let's try anyway
 527                                         // and just log the instance.
 528                                         //
 529                                         // @todo FIXME: See if we could issue a 307 or 308 here, need
 530                                         // to see how clients (automated & browser) behave when we do
 531                                         wfDebugLog( 'RedirectedPosts', "Redirected from HTTP to HTTPS: $oldUrl" );
 532                                 }
 533                                 // Setup dummy Title, otherwise OutputPage::redirect will fail
 534                                 $title = Title::newFromText( 'REDIR', NS_MAIN );
 535                                 $this->context->setTitle( $title );
 536                                 $output = $this->context->getOutput();
 537                                 // Since we only do this redir to change proto, always send a vary header
 538                                 $output->addVaryHeader( 'X-Forwarded-Proto' );
 539                                 $output->redirect( $redirUrl );
 540                                 $output->output();
 541                                 return;
 542                         }
 543                 }
 544
 545                 if ( $this->config->get( 'UseFileCache' ) && $title->getNamespace() >= 0 ) {
 546                         if ( HTMLFileCache::useFileCache( $this->context ) ) {
 547                                 // Try low-level file cache hit
 548                                 $cache = new HTMLFileCache( $title, $action );
 549                                 if ( $cache->isCacheGood( /* Assume up to date */ ) ) {
 550                                         // Check incoming headers to see if client has this cached
 551                                         $timestamp = $cache->cacheTimestamp();
 552                                         if ( !$this->context->getOutput()->checkLastModified( $timestamp ) ) {
 553                                                 $cache->loadFromFileCache( $this->context );
 554                                         }
 555                                         // Do any stats increment/watchlist stuff
 556                                         // Assume we're viewing the latest revision (this should always be the case with file cache)
 557                                         $this->context->getWikiPage()->doViewUpdates( $this->context->getUser() );
 558                                         // Tell OutputPage that output is taken care of
 559                                         $this->context->getOutput()->disable();
 560                                         return;
 561                                 }
 562                         }
 563                 }
 564
 565                 // Actually do the work of the request and build up any output
 566                 $this->performRequest();
 567
 568                 // Either all DB and deferred updates should happen or none.
 569                 // The later should not be cancelled due to client disconnect.
 570                 ignore_user_abort( true );
 571                 // Now commit any transactions, so that unreported errors after
 572                 // output() don't roll back the whole DB transaction
 573                 wfGetLBFactory()->commitMasterChanges();
 574
 575                 // Output everything!
 576                 $this->context->getOutput()->output();
 577
 578         }
 579
 580         /**
 581          * Ends this task peacefully
 582          */
 583         public function restInPeace() {
 584                 // Ignore things like master queries/connections on GET requests
 585                 // as long as they are in deferred updates (which catch errors).
 586                 Profiler::instance()->getTransactionProfiler()->resetExpectations();
 587
 588                 // Do any deferred jobs
 589                 DeferredUpdates::doUpdates( 'commit' );
 590
 591                 // Log profiling data, e.g. in the database or UDP
 592                 wfLogProfilingData();
 593
 594                 // Commit and close up!
 595                 $factory = wfGetLBFactory();
 596                 $factory->commitMasterChanges();
 597                 $factory->shutdown();
 598
 599                 wfDebug( "Request ended normally\n" );
 600         }
 601
 602         /**
 603          * Potentially open a socket and sent an HTTP request back to the server
 604          * to run a specified number of jobs. This registers a callback to cleanup
 605          * the socket once it's done.
 606          */
 607         protected function triggerJobs() {
 608                 $jobRunRate = $this->config->get( 'JobRunRate' );
 609                 if ( $jobRunRate <= 0 || wfReadOnly() ) {
 610                         return;
 611                 } elseif ( $this->getTitle()->isSpecial( 'RunJobs' ) ) {
 612                         return; // recursion guard
 613                 }
 614
 615                 if ( $jobRunRate < 1 ) {
 616                         $max = mt_getrandmax();
 617                         if ( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 618                                 return; // the higher the job run rate, the less likely we return here
 619                         }
 620                         $n = 1;
 621                 } else {
 622                         $n = intval( $jobRunRate );
 623                 }
 624
 625                 $runJobsLogger = LoggerFactory::getInstance( 'runJobs' );
 626
 627                 if ( !$this->config->get( 'RunJobsAsync' ) ) {
 628                         // Fall back to running the job here while the user waits
 629                         $runner = new JobRunner( $runJobsLogger );
 630                         $runner->run( array( 'maxJobs'  => $n ) );
 631                         return;
 632                 }
 633
 634                 try {
 635                         if ( !JobQueueGroup::singleton()->queuesHaveJobs( JobQueueGroup::TYPE_DEFAULT ) ) {
 636                                 return; // do not send request if there are probably no jobs
 637                         }
 638                 } catch ( JobQueueError $e ) {
 639                         MWExceptionHandler::logException( $e );
 640                         return; // do not make the site unavailable
 641                 }
 642
 643                 $query = array( 'title' => 'Special:RunJobs',
 644                         'tasks' => 'jobs', 'maxjobs' => $n, 'sigexpiry' => time() + 5 );
 645                 $query['signature'] = SpecialRunJobs::getQuerySignature(
 646                         $query, $this->config->get( 'SecretKey' ) );
 647
 648                 $errno = $errstr = null;
 649                 $info = wfParseUrl( $this->config->get( 'Server' ) );
 650                 wfSuppressWarnings();
 651                 $sock = fsockopen(
 652                         $info['host'],
 653                         isset( $info['port'] ) ? $info['port'] : 80,
 654                         $errno,
 655                         $errstr,
 656                         // If it takes more than 100ms to connect to ourselves there
 657                         // is a problem elsewhere.
 658                         0.1
 659                 );
 660                 wfRestoreWarnings();
 661                 if ( !$sock ) {
 662                         $runJobsLogger->error( "Failed to start cron API (socket error $errno): $errstr" );
 663                         // Fall back to running the job here while the user waits
 664                         $runner = new JobRunner( $runJobsLogger );
 665                         $runner->run( array( 'maxJobs'  => $n ) );
 666                         return;
 667                 }
 668
 669                 $url = wfAppendQuery( wfScript( 'index' ), $query );
 670                 $req = (
 671                         "POST $url HTTP/1.1\r\n" .
 672                         "Host: {$info['host']}\r\n" .
 673                         "Connection: Close\r\n" .
 674                         "Content-Length: 0\r\n\r\n"
 675                 );
 676
 677                 $runJobsLogger->info( "Running $n job(s) via '$url'" );
 678                 // Send a cron API request to be performed in the background.
 679                 // Give up if this takes too long to send (which should be rare).
 680                 stream_set_timeout( $sock, 1 );
 681                 $bytes = fwrite( $sock, $req );
 682                 if ( $bytes !== strlen( $req ) ) {
 683                         $runJobsLogger->error( "Failed to start cron API (socket write error)" );
 684                 } else {
 685                         // Do not wait for the response (the script should handle client aborts).
 686                         // Make sure that we don't close before that script reaches ignore_user_abort().
 687                         $status = fgets( $sock );
 688                         if ( !preg_match( '#^HTTP/\d\.\d 202 #', $status ) ) {
 689                                 $runJobsLogger->error( "Failed to start cron API: received '$status'" );
 690                         }
 691                 }
 692                 fclose( $sock );
 693         }
 694 }