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