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JobRunner.php
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1 <?php
32 
39 class JobRunner implements LoggerAwareInterface {
41  protected $config;
43  protected $debug;
44 
48  protected $logger;
49 
50  const MAX_ALLOWED_LAG = 3; // abort if more than this much DB lag is present
51  const LAG_CHECK_PERIOD = 1.0; // check replica DB lag this many seconds
52  const ERROR_BACKOFF_TTL = 1; // seconds to back off a queue due to errors
53  const READONLY_BACKOFF_TTL = 30; // seconds to back off a queue due to read-only errors
54 
58  public function setDebugHandler( $debug ) {
59  $this->debug = $debug;
60  }
61 
66  public function setLogger( LoggerInterface $logger ) {
67  $this->logger = $logger;
68  }
69 
73  public function __construct( LoggerInterface $logger = null ) {
74  if ( $logger === null ) {
75  $logger = LoggerFactory::getInstance( 'runJobs' );
76  }
77  $this->setLogger( $logger );
78  $this->config = MediaWikiServices::getInstance()->getMainConfig();
79  }
80 
105  public function run( array $options ) {
106  $jobClasses = $this->config->get( 'JobClasses' );
107  $profilerLimits = $this->config->get( 'TrxProfilerLimits' );
108 
109  $response = [ 'jobs' => [], 'reached' => 'none-ready' ];
110 
111  $type = $options['type'] ?? false;
112  $maxJobs = $options['maxJobs'] ?? false;
113  $maxTime = $options['maxTime'] ?? false;
114  $noThrottle = isset( $options['throttle'] ) && !$options['throttle'];
115 
116  // Bail if job type is invalid
117  if ( $type !== false && !isset( $jobClasses[$type] ) ) {
118  $response['reached'] = 'none-possible';
119  return $response;
120  }
121 
122  // Bail out if DB is in read-only mode
123  if ( wfReadOnly() ) {
124  $response['reached'] = 'read-only';
125  return $response;
126  }
127 
128  $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
129  if ( $lbFactory->hasTransactionRound() ) {
130  throw new LogicException( __METHOD__ . ' called with an active transaction round.' );
131  }
132  // Bail out if there is too much DB lag.
133  // This check should not block as we want to try other wiki queues.
134  list( , $maxLag ) = $lbFactory->getMainLB()->getMaxLag();
135  if ( $maxLag >= self::MAX_ALLOWED_LAG ) {
136  $response['reached'] = 'replica-lag-limit';
137  return $response;
138  }
139 
140  // Catch huge single updates that lead to replica DB lag
141  $trxProfiler = Profiler::instance()->getTransactionProfiler();
142  $trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
143  $trxProfiler->setExpectations( $profilerLimits['JobRunner'], __METHOD__ );
144 
145  // Some jobs types should not run until a certain timestamp
146  $backoffs = []; // map of (type => UNIX expiry)
147  $backoffDeltas = []; // map of (type => seconds)
148  $wait = 'wait'; // block to read backoffs the first time
149 
150  $group = JobQueueGroup::singleton();
151  $stats = MediaWikiServices::getInstance()->getStatsdDataFactory();
152  $jobsPopped = 0;
153  $timeMsTotal = 0;
154  $startTime = microtime( true ); // time since jobs started running
155  $lastCheckTime = 1; // timestamp of last replica DB check
156  do {
157  // Sync the persistent backoffs with concurrent runners
158  $backoffs = $this->syncBackoffDeltas( $backoffs, $backoffDeltas, $wait );
159  $blacklist = $noThrottle ? [] : array_keys( $backoffs );
160  $wait = 'nowait'; // less important now
161 
162  if ( $type === false ) {
163  $job = $group->pop(
166  $blacklist
167  );
168  } elseif ( in_array( $type, $blacklist ) ) {
169  $job = false; // requested queue in backoff state
170  } else {
171  $job = $group->pop( $type ); // job from a single queue
172  }
173 
174  if ( $job ) { // found a job
175  ++$jobsPopped;
176  $popTime = time();
177  $jType = $job->getType();
178 
179  WebRequest::overrideRequestId( $job->getRequestId() );
180 
181  // Back off of certain jobs for a while (for throttling and for errors)
182  $ttw = $this->getBackoffTimeToWait( $job );
183  if ( $ttw > 0 ) {
184  // Always add the delta for other runners in case the time running the
185  // job negated the backoff for each individually but not collectively.
186  $backoffDeltas[$jType] = isset( $backoffDeltas[$jType] )
187  ? $backoffDeltas[$jType] + $ttw
188  : $ttw;
189  $backoffs = $this->syncBackoffDeltas( $backoffs, $backoffDeltas, $wait );
190  }
191 
192  $info = $this->executeJob( $job, $lbFactory, $stats, $popTime );
193  if ( $info['status'] !== false || !$job->allowRetries() ) {
194  $group->ack( $job ); // succeeded or job cannot be retried
195  }
196 
197  // Back off of certain jobs for a while (for throttling and for errors)
198  if ( $info['status'] === false && mt_rand( 0, 49 ) == 0 ) {
199  $ttw = max( $ttw, $this->getErrorBackoffTTL( $info['error'] ) );
200  $backoffDeltas[$jType] = isset( $backoffDeltas[$jType] )
201  ? $backoffDeltas[$jType] + $ttw
202  : $ttw;
203  }
204 
205  $response['jobs'][] = [
206  'type' => $jType,
207  'status' => ( $info['status'] === false ) ? 'failed' : 'ok',
208  'error' => $info['error'],
209  'time' => $info['timeMs']
210  ];
211  $timeMsTotal += $info['timeMs'];
212 
213  // Break out if we hit the job count or wall time limits...
214  if ( $maxJobs && $jobsPopped >= $maxJobs ) {
215  $response['reached'] = 'job-limit';
216  break;
217  } elseif ( $maxTime && ( microtime( true ) - $startTime ) > $maxTime ) {
218  $response['reached'] = 'time-limit';
219  break;
220  }
221 
222  // Don't let any of the main DB replica DBs get backed up.
223  // This only waits for so long before exiting and letting
224  // other wikis in the farm (on different masters) get a chance.
225  $timePassed = microtime( true ) - $lastCheckTime;
226  if ( $timePassed >= self::LAG_CHECK_PERIOD || $timePassed < 0 ) {
227  $success = $lbFactory->waitForReplication( [
228  'ifWritesSince' => $lastCheckTime,
229  'timeout' => self::MAX_ALLOWED_LAG,
230  ] );
231  if ( !$success ) {
232  $response['reached'] = 'replica-lag-limit';
233  break;
234  }
235  $lastCheckTime = microtime( true );
236  }
237 
238  // Bail if near-OOM instead of in a job
239  if ( !$this->checkMemoryOK() ) {
240  $response['reached'] = 'memory-limit';
241  break;
242  }
243  }
244  } while ( $job ); // stop when there are no jobs
245 
246  // Sync the persistent backoffs for the next runJobs.php pass
247  if ( $backoffDeltas ) {
248  $this->syncBackoffDeltas( $backoffs, $backoffDeltas, 'wait' );
249  }
250 
251  $response['backoffs'] = $backoffs;
252  $response['elapsed'] = $timeMsTotal;
253 
254  return $response;
255  }
256 
261  private function getErrorBackoffTTL( $error ) {
262  return strpos( $error, 'DBReadOnlyError' ) !== false
263  ? self::READONLY_BACKOFF_TTL
264  : self::ERROR_BACKOFF_TTL;
265  }
266 
274  private function executeJob( RunnableJob $job, LBFactory $lbFactory, $stats, $popTime ) {
275  $jType = $job->getType();
276  $msg = $job->toString() . " STARTING";
277  $this->logger->debug( $msg, [
278  'job_type' => $job->getType(),
279  ] );
280  $this->debugCallback( $msg );
281 
282  // Clear out title cache data from prior snapshots
283  // (e.g. from before JobRunner was invoked in this process)
284  MediaWikiServices::getInstance()->getLinkCache()->clear();
285 
286  // Run the job...
287  $rssStart = $this->getMaxRssKb();
288  $jobStartTime = microtime( true );
289  try {
290  $fnameTrxOwner = get_class( $job ) . '::run'; // give run() outer scope
291  // Flush any pending changes left over from an implicit transaction round
292  if ( $job->hasExecutionFlag( $job::JOB_NO_EXPLICIT_TRX_ROUND ) ) {
293  $lbFactory->commitMasterChanges( $fnameTrxOwner ); // new implicit round
294  } else {
295  $lbFactory->beginMasterChanges( $fnameTrxOwner ); // new explicit round
296  }
297  // Clear any stale REPEATABLE-READ snapshots from replica DB connections
298  $lbFactory->flushReplicaSnapshots( $fnameTrxOwner );
299  $status = $job->run();
300  $error = $job->getLastError();
301  // Commit all pending changes from this job
302  $this->commitMasterChanges( $lbFactory, $job, $fnameTrxOwner );
303  // Run any deferred update tasks; doUpdates() manages transactions itself
305  } catch ( Exception $e ) {
307  $status = false;
308  $error = get_class( $e ) . ': ' . $e->getMessage();
309  }
310  // Always attempt to call teardown() even if Job throws exception.
311  try {
312  $job->teardown( $status );
313  } catch ( Exception $e ) {
315  }
316 
317  $timeMs = intval( ( microtime( true ) - $jobStartTime ) * 1000 );
318  $rssEnd = $this->getMaxRssKb();
319 
320  // Record how long jobs wait before getting popped
321  $readyTs = $job->getReadyTimestamp();
322  if ( $readyTs ) {
323  $pickupDelay = max( 0, $popTime - $readyTs );
324  $stats->timing( 'jobqueue.pickup_delay.all', 1000 * $pickupDelay );
325  $stats->timing( "jobqueue.pickup_delay.$jType", 1000 * $pickupDelay );
326  }
327  // Record root job age for jobs being run
328  $rootTimestamp = $job->getRootJobParams()['rootJobTimestamp'];
329  if ( $rootTimestamp ) {
330  $age = max( 0, $popTime - wfTimestamp( TS_UNIX, $rootTimestamp ) );
331  $stats->timing( "jobqueue.pickup_root_age.$jType", 1000 * $age );
332  }
333  // Track the execution time for jobs
334  $stats->timing( "jobqueue.run.$jType", $timeMs );
335  // Track RSS increases for jobs (in case of memory leaks)
336  if ( $rssStart && $rssEnd ) {
337  $stats->updateCount( "jobqueue.rss_delta.$jType", $rssEnd - $rssStart );
338  }
339 
340  if ( $status === false ) {
341  $msg = $job->toString() . " t={job_duration} error={job_error}";
342  $this->logger->error( $msg, [
343  'job_type' => $job->getType(),
344  'job_duration' => $timeMs,
345  'job_error' => $error,
346  ] );
347 
348  $msg = $job->toString() . " t=$timeMs error={$error}";
349  $this->debugCallback( $msg );
350  } else {
351  $msg = $job->toString() . " t={job_duration} good";
352  $this->logger->info( $msg, [
353  'job_type' => $job->getType(),
354  'job_duration' => $timeMs,
355  ] );
356 
357  $msg = $job->toString() . " t=$timeMs good";
358  $this->debugCallback( $msg );
359  }
360 
361  return [ 'status' => $status, 'error' => $error, 'timeMs' => $timeMs ];
362  }
363 
367  private function getMaxRssKb() {
368  $info = wfGetRusage() ?: [];
369  // see https://linux.die.net/man/2/getrusage
370  return isset( $info['ru_maxrss'] ) ? (int)$info['ru_maxrss'] : null;
371  }
372 
378  private function getBackoffTimeToWait( RunnableJob $job ) {
379  $throttling = $this->config->get( 'JobBackoffThrottling' );
380 
381  if ( !isset( $throttling[$job->getType()] ) || $job instanceof DuplicateJob ) {
382  return 0; // not throttled
383  }
384 
385  $itemsPerSecond = $throttling[$job->getType()];
386  if ( $itemsPerSecond <= 0 ) {
387  return 0; // not throttled
388  }
389 
390  $seconds = 0;
391  if ( $job->workItemCount() > 0 ) {
392  $exactSeconds = $job->workItemCount() / $itemsPerSecond;
393  // use randomized rounding
394  $seconds = floor( $exactSeconds );
395  $remainder = $exactSeconds - $seconds;
396  $seconds += ( mt_rand() / mt_getrandmax() < $remainder ) ? 1 : 0;
397  }
398 
399  return (int)$seconds;
400  }
401 
410  private function loadBackoffs( array $backoffs, $mode = 'wait' ) {
411  $file = wfTempDir() . '/mw-runJobs-backoffs.json';
412  if ( is_file( $file ) ) {
413  $noblock = ( $mode === 'nowait' ) ? LOCK_NB : 0;
414  $handle = fopen( $file, 'rb' );
415  if ( !flock( $handle, LOCK_SH | $noblock ) ) {
416  fclose( $handle );
417  return $backoffs; // don't wait on lock
418  }
419  $content = stream_get_contents( $handle );
420  flock( $handle, LOCK_UN );
421  fclose( $handle );
422  $ctime = microtime( true );
423  $cBackoffs = json_decode( $content, true ) ?: [];
424  foreach ( $cBackoffs as $type => $timestamp ) {
425  if ( $timestamp < $ctime ) {
426  unset( $cBackoffs[$type] );
427  }
428  }
429  } else {
430  $cBackoffs = [];
431  }
432 
433  return $cBackoffs;
434  }
435 
447  private function syncBackoffDeltas( array $backoffs, array &$deltas, $mode = 'wait' ) {
448  if ( !$deltas ) {
449  return $this->loadBackoffs( $backoffs, $mode );
450  }
451 
452  $noblock = ( $mode === 'nowait' ) ? LOCK_NB : 0;
453  $file = wfTempDir() . '/mw-runJobs-backoffs.json';
454  $handle = fopen( $file, 'wb+' );
455  if ( !flock( $handle, LOCK_EX | $noblock ) ) {
456  fclose( $handle );
457  return $backoffs; // don't wait on lock
458  }
459  $ctime = microtime( true );
460  $content = stream_get_contents( $handle );
461  $cBackoffs = json_decode( $content, true ) ?: [];
462  foreach ( $deltas as $type => $seconds ) {
463  $cBackoffs[$type] = isset( $cBackoffs[$type] ) && $cBackoffs[$type] >= $ctime
464  ? $cBackoffs[$type] + $seconds
465  : $ctime + $seconds;
466  }
467  foreach ( $cBackoffs as $type => $timestamp ) {
468  if ( $timestamp < $ctime ) {
469  unset( $cBackoffs[$type] );
470  }
471  }
472  ftruncate( $handle, 0 );
473  fwrite( $handle, json_encode( $cBackoffs ) );
474  flock( $handle, LOCK_UN );
475  fclose( $handle );
476 
477  $deltas = [];
478 
479  return $cBackoffs;
480  }
481 
487  private function checkMemoryOK() {
488  static $maxBytes = null;
489  if ( $maxBytes === null ) {
490  $m = [];
491  if ( preg_match( '!^(\d+)(k|m|g|)$!i', ini_get( 'memory_limit' ), $m ) ) {
492  list( , $num, $unit ) = $m;
493  $conv = [ 'g' => 1073741824, 'm' => 1048576, 'k' => 1024, '' => 1 ];
494  $maxBytes = $num * $conv[strtolower( $unit )];
495  } else {
496  $maxBytes = 0;
497  }
498  }
499  $usedBytes = memory_get_usage();
500  if ( $maxBytes && $usedBytes >= 0.95 * $maxBytes ) {
501  $msg = "Detected excessive memory usage ({used_bytes}/{max_bytes}).";
502  $this->logger->error( $msg, [
503  'used_bytes' => $usedBytes,
504  'max_bytes' => $maxBytes,
505  ] );
506 
507  $msg = "Detected excessive memory usage ($usedBytes/$maxBytes).";
508  $this->debugCallback( $msg );
509 
510  return false;
511  }
512 
513  return true;
514  }
515 
520  private function debugCallback( $msg ) {
521  if ( $this->debug ) {
522  call_user_func_array( $this->debug, [ wfTimestamp( TS_DB ) . " $msg\n" ] );
523  }
524  }
525 
537  private function commitMasterChanges( LBFactory $lbFactory, RunnableJob $job, $fnameTrxOwner ) {
538  $syncThreshold = $this->config->get( 'JobSerialCommitThreshold' );
539 
540  $time = false;
541  $lb = $lbFactory->getMainLB();
542  if ( $syncThreshold !== false && $lb->hasStreamingReplicaServers() ) {
543  // Generally, there is one master connection to the local DB
544  $dbwSerial = $lb->getAnyOpenConnection( $lb->getWriterIndex() );
545  // We need natively blocking fast locks
546  if ( $dbwSerial && $dbwSerial->namedLocksEnqueue() ) {
547  $time = $dbwSerial->pendingWriteQueryDuration( $dbwSerial::ESTIMATE_DB_APPLY );
548  if ( $time < $syncThreshold ) {
549  $dbwSerial = false;
550  }
551  } else {
552  $dbwSerial = false;
553  }
554  } else {
555  // There are no replica DBs or writes are all to foreign DB (we don't handle that)
556  $dbwSerial = false;
557  }
558 
559  if ( !$dbwSerial ) {
560  $lbFactory->commitMasterChanges(
561  $fnameTrxOwner,
562  // Abort if any transaction was too big
563  [ 'maxWriteDuration' => $this->config->get( 'MaxJobDBWriteDuration' ) ]
564  );
565 
566  return;
567  }
568 
569  $ms = intval( 1000 * $time );
570 
571  $msg = $job->toString() . " COMMIT ENQUEUED [{job_commit_write_ms}ms of writes]";
572  $this->logger->info( $msg, [
573  'job_type' => $job->getType(),
574  'job_commit_write_ms' => $ms,
575  ] );
576 
577  $msg = $job->toString() . " COMMIT ENQUEUED [{$ms}ms of writes]";
578  $this->debugCallback( $msg );
579 
580  // Wait for an exclusive lock to commit
581  if ( !$dbwSerial->lock( 'jobrunner-serial-commit', $fnameTrxOwner, 30 ) ) {
582  // This will trigger a rollback in the main loop
583  throw new DBError( $dbwSerial, "Timed out waiting on commit queue." );
584  }
585  $unlocker = new ScopedCallback( function () use ( $dbwSerial, $fnameTrxOwner ) {
586  $dbwSerial->unlock( 'jobrunner-serial-commit', $fnameTrxOwner );
587  } );
588 
589  // Wait for the replica DBs to catch up
590  $pos = $lb->getMasterPos();
591  if ( $pos ) {
592  $lb->waitForAll( $pos );
593  }
594 
595  // Actually commit the DB master changes
596  $lbFactory->commitMasterChanges(
597  $fnameTrxOwner,
598  // Abort if any transaction was too big
599  [ 'maxWriteDuration' => $this->config->get( 'MaxJobDBWriteDuration' ) ]
600  );
601  ScopedCallback::consume( $unlocker );
602  }
603 }
deferred txt A few of the database updates required by various functions here can be deferred until after the result page is displayed to the user For updating the view updating the linked to tables after a etc PHP does not yet have any way to tell the server to actually return and disconnect while still running these but it might have such a feature in the future We handle these by creating a deferred update object and putting those objects on a global list
Definition: deferred.txt:11
flushReplicaSnapshots( $fname=__METHOD__)
Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshot.
Definition: LBFactory.php:235
$success
processing should stop and the error should be shown to the user * false
Definition: hooks.txt:193
An interface for generating database load balancers.
Definition: LBFactory.php:40
callable null $debug
Debug output handler.
Definition: JobRunner.php:43
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
if(PHP_SAPI !='cli-server') if(!isset( $_SERVER['SCRIPT_FILENAME'])) $file
Definition: router.php:42
div flags Integer display flags(NO_ACTION_LINK, NO_EXTRA_USER_LINKS) 'LogException' returning false will NOT prevent logging $e
Definition: hooks.txt:2158
wfGetRusage()
Get system resource usage of current request context.
const LAG_CHECK_PERIOD
Definition: JobRunner.php:51
setLogger(LoggerInterface $logger)
Definition: JobRunner.php:66
static instance()
Singleton.
Definition: Profiler.php:62
loadBackoffs(array $backoffs, $mode='wait')
Get the previous backoff expiries from persistent storage On I/O or lock acquisition failure this ret...
Definition: JobRunner.php:410
Config $config
Definition: JobRunner.php:41
const MAX_ALLOWED_LAG
Definition: JobRunner.php:50
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency MediaWikiServices
Definition: injection.txt:23
static rollbackMasterChangesAndLog( $e)
Roll back any open database transactions and log the stack trace of the exception.
this hook is for auditing only $response
Definition: hooks.txt:773
see documentation in includes Linker php for Linker::makeImageLink & $time
Definition: hooks.txt:1792
commitMasterChanges( $fname=__METHOD__, array $options=[])
Commit changes and clear view snapshots on all master connections.
Definition: LBFactory.php:266
No-op job that does nothing.
setDebugHandler( $debug)
Definition: JobRunner.php:58
run()
Run the job.
Status::newGood()` to allow deletion, and then `return false` from the hook function. Ensure you consume the 'ChangeTagAfterDelete' hook to carry out custom deletion actions. $tag:name of the tag $user:user initiating the action & $status:Status object. See above. 'ChangeTagsListActive':Allows you to nominate which of the tags your extension uses are in active use. & $tags:list of all active tags. Append to this array. 'ChangeTagsAfterUpdateTags':Called after tags have been updated with the ChangeTags::updateTags function. Params:$addedTags:tags effectively added in the update $removedTags:tags effectively removed in the update $prevTags:tags that were present prior to the update $rc_id:recentchanges table id $rev_id:revision table id $log_id:logging table id $params:tag params $rc:RecentChange being tagged when the tagging accompanies the action, or null $user:User who performed the tagging when the tagging is subsequent to the action, or null 'ChangeTagsAllowedAdd':Called when checking if a user can add tags to a change. & $allowedTags:List of all the tags the user is allowed to add. Any tags the user wants to add( $addTags) that are not in this array will cause it to fail. You may add or remove tags to this array as required. $addTags:List of tags user intends to add. $user:User who is adding the tags. 'ChangeUserGroups':Called before user groups are changed. $performer:The User who will perform the change $user:The User whose groups will be changed & $add:The groups that will be added & $remove:The groups that will be removed 'Collation::factory':Called if $wgCategoryCollation is an unknown collation. $collationName:Name of the collation in question & $collationObject:Null. Replace with a subclass of the Collation class that implements the collation given in $collationName. 'ConfirmEmailComplete':Called after a user 's email has been confirmed successfully. $user:user(object) whose email is being confirmed 'ContentAlterParserOutput':Modify parser output for a given content object. Called by Content::getParserOutput after parsing has finished. Can be used for changes that depend on the result of the parsing but have to be done before LinksUpdate is called(such as adding tracking categories based on the rendered HTML). $content:The Content to render $title:Title of the page, as context $parserOutput:ParserOutput to manipulate 'ContentGetParserOutput':Customize parser output for a given content object, called by AbstractContent::getParserOutput. May be used to override the normal model-specific rendering of page content. $content:The Content to render $title:Title of the page, as context $revId:The revision ID, as context $options:ParserOptions for rendering. To avoid confusing the parser cache, the output can only depend on parameters provided to this hook function, not on global state. $generateHtml:boolean, indicating whether full HTML should be generated. If false, generation of HTML may be skipped, but other information should still be present in the ParserOutput object. & $output:ParserOutput, to manipulate or replace 'ContentHandlerDefaultModelFor':Called when the default content model is determined for a given title. May be used to assign a different model for that title. $title:the Title in question & $model:the model name. Use with CONTENT_MODEL_XXX constants. 'ContentHandlerForModelID':Called when a ContentHandler is requested for a given content model name, but no entry for that model exists in $wgContentHandlers. Note:if your extension implements additional models via this hook, please use GetContentModels hook to make them known to core. $modeName:the requested content model name & $handler:set this to a ContentHandler object, if desired. 'ContentModelCanBeUsedOn':Called to determine whether that content model can be used on a given page. This is especially useful to prevent some content models to be used in some special location. $contentModel:ID of the content model in question $title:the Title in question. & $ok:Output parameter, whether it is OK to use $contentModel on $title. Handler functions that modify $ok should generally return false to prevent further hooks from further modifying $ok. 'ContribsPager::getQueryInfo':Before the contributions query is about to run & $pager:Pager object for contributions & $queryInfo:The query for the contribs Pager 'ContribsPager::reallyDoQuery':Called before really executing the query for My Contributions & $data:an array of results of all contribs queries $pager:The ContribsPager object hooked into $offset:Index offset, inclusive $limit:Exact query limit $descending:Query direction, false for ascending, true for descending 'ContributionsLineEnding':Called before a contributions HTML line is finished $page:SpecialPage object for contributions & $ret:the HTML line $row:the DB row for this line & $classes:the classes to add to the surrounding< li > & $attribs:associative array of other HTML attributes for the< li > element. Currently only data attributes reserved to MediaWiki are allowed(see Sanitizer::isReservedDataAttribute). 'ContributionsToolLinks':Change tool links above Special:Contributions $id:User identifier $title:User page title & $tools:Array of tool links $specialPage:SpecialPage instance for context and services. Can be either SpecialContributions or DeletedContributionsPage. Extensions should type hint against a generic SpecialPage though. 'ConvertContent':Called by AbstractContent::convert when a conversion to another content model is requested. Handler functions that modify $result should generally return false to disable further attempts at conversion. $content:The Content object to be converted. $toModel:The ID of the content model to convert to. $lossy:boolean indicating whether lossy conversion is allowed. & $result:Output parameter, in case the handler function wants to provide a converted Content object. Note that $result->getContentModel() must return $toModel. 'ContentSecurityPolicyDefaultSource':Modify the allowed CSP load sources. This affects all directives except for the script directive. If you want to add a script source, see ContentSecurityPolicyScriptSource hook. & $defaultSrc:Array of Content-Security-Policy allowed sources $policyConfig:Current configuration for the Content-Security-Policy header $mode:ContentSecurityPolicy::REPORT_ONLY_MODE or ContentSecurityPolicy::FULL_MODE depending on type of header 'ContentSecurityPolicyDirectives':Modify the content security policy directives. Use this only if ContentSecurityPolicyDefaultSource and ContentSecurityPolicyScriptSource do not meet your needs. & $directives:Array of CSP directives $policyConfig:Current configuration for the CSP header $mode:ContentSecurityPolicy::REPORT_ONLY_MODE or ContentSecurityPolicy::FULL_MODE depending on type of header 'ContentSecurityPolicyScriptSource':Modify the allowed CSP script sources. Note that you also have to use ContentSecurityPolicyDefaultSource if you want non-script sources to be loaded from whatever you add. & $scriptSrc:Array of CSP directives $policyConfig:Current configuration for the CSP header $mode:ContentSecurityPolicy::REPORT_ONLY_MODE or ContentSecurityPolicy::FULL_MODE depending on type of header 'CustomEditor':When invoking the page editor Return true to allow the normal editor to be used, or false if implementing a custom editor, e.g. for a special namespace, etc. $article:Article being edited $user:User performing the edit 'DeletedContribsPager::reallyDoQuery':Called before really executing the query for Special:DeletedContributions Similar to ContribsPager::reallyDoQuery & $data:an array of results of all contribs queries $pager:The DeletedContribsPager object hooked into $offset:Index offset, inclusive $limit:Exact query limit $descending:Query direction, false for ascending, true for descending 'DeletedContributionsLineEnding':Called before a DeletedContributions HTML line is finished. Similar to ContributionsLineEnding $page:SpecialPage object for DeletedContributions & $ret:the HTML line $row:the DB row for this line & $classes:the classes to add to the surrounding< li > & $attribs:associative array of other HTML attributes for the< li > element. Currently only data attributes reserved to MediaWiki are allowed(see Sanitizer::isReservedDataAttribute). 'DeleteUnknownPreferences':Called by the cleanupPreferences.php maintenance script to build a WHERE clause with which to delete preferences that are not known about. This hook is used by extensions that have dynamically-named preferences that should not be deleted in the usual cleanup process. For example, the Gadgets extension creates preferences prefixed with 'gadget-', and so anything with that prefix is excluded from the deletion. &where:An array that will be passed as the $cond parameter to IDatabase::select() to determine what will be deleted from the user_properties table. $db:The IDatabase object, useful for accessing $db->buildLike() etc. 'DifferenceEngineAfterLoadNewText':called in DifferenceEngine::loadNewText() after the new revision 's content has been loaded into the class member variable $differenceEngine->mNewContent but before returning true from this function. $differenceEngine:DifferenceEngine object 'DifferenceEngineLoadTextAfterNewContentIsLoaded':called in DifferenceEngine::loadText() after the new revision 's content has been loaded into the class member variable $differenceEngine->mNewContent but before checking if the variable 's value is null. This hook can be used to inject content into said class member variable. $differenceEngine:DifferenceEngine object 'DifferenceEngineMarkPatrolledLink':Allows extensions to change the "mark as patrolled" link which is shown both on the diff header as well as on the bottom of a page, usually wrapped in a span element which has class="patrollink". $differenceEngine:DifferenceEngine object & $markAsPatrolledLink:The "mark as patrolled" link HTML(string) $rcid:Recent change ID(rc_id) for this change(int) 'DifferenceEngineMarkPatrolledRCID':Allows extensions to possibly change the rcid parameter. For example the rcid might be set to zero due to the user being the same as the performer of the change but an extension might still want to show it under certain conditions. & $rcid:rc_id(int) of the change or 0 $differenceEngine:DifferenceEngine object $change:RecentChange object $user:User object representing the current user 'DifferenceEngineNewHeader':Allows extensions to change the $newHeader variable, which contains information about the new revision, such as the revision 's author, whether the revision was marked as a minor edit or not, etc. $differenceEngine:DifferenceEngine object & $newHeader:The string containing the various #mw-diff-otitle[1-5] divs, which include things like revision author info, revision comment, RevisionDelete link and more $formattedRevisionTools:Array containing revision tools, some of which may have been injected with the DiffRevisionTools hook $nextlink:String containing the link to the next revision(if any) $status
Definition: hooks.txt:1250
wfTimestamp( $outputtype=TS_UNIX, $ts=0)
Get a timestamp string in one of various formats.
getErrorBackoffTTL( $error)
Definition: JobRunner.php:261
wfReadOnly()
Check whether the wiki is in read-only mode.
wfTempDir()
Tries to get the system directory for temporary files.
run(array $options)
Run jobs of the specified number/type for the specified time.
Definition: JobRunner.php:105
const READONLY_BACKOFF_TTL
Definition: JobRunner.php:53
$wait
static logException( $e, $catcher=self::CAUGHT_BY_OTHER)
Log an exception to the exception log (if enabled).
null means default in associative array with keys and values unescaped Should be merged with default with a value of false meaning to suppress the attribute in associative array with keys and values unescaped & $options
Definition: hooks.txt:1983
hasExecutionFlag( $flag)
this hook is for auditing only or null if authentication failed before getting that far or null if we can t even determine that When $user is not null
Definition: hooks.txt:773
Job that has a run() method and metadata accessors for JobQueue::pop() and JobQueue::ack() ...
Definition: RunnableJob.php:35
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
Definition: distributors.txt:9
executeJob(RunnableJob $job, LBFactory $lbFactory, $stats, $popTime)
Definition: JobRunner.php:274
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
static doUpdates( $mode='run', $stage=self::ALL)
Do any deferred updates and clear the list.
Job queue runner utility methods.
Definition: JobRunner.php:39
static overrideRequestId( $id)
Override the unique request ID.
Definition: WebRequest.php:302
const ERROR_BACKOFF_TTL
Definition: JobRunner.php:52
if(count( $args)< 1) $job
commitMasterChanges(LBFactory $lbFactory, RunnableJob $job, $fnameTrxOwner)
Issue a commit on all masters who are currently in a transaction and have made changes to the databas...
Definition: JobRunner.php:537
getBackoffTimeToWait(RunnableJob $job)
Definition: JobRunner.php:378
MediaWiki Logger LoggerFactory implements a PSR [0] compatible message logging system Named Psr Log LoggerInterface instances can be obtained from the MediaWiki Logger LoggerFactory::getInstance() static method. MediaWiki\Logger\LoggerFactory expects a class implementing the MediaWiki\Logger\Spi interface to act as a factory for new Psr\Log\LoggerInterface instances. The "Spi" in MediaWiki\Logger\Spi stands for "service provider interface". An SPI is an API intended to be implemented or extended by a third party. This software design pattern is intended to enable framework extension and replaceable components. It is specifically used in the MediaWiki\Logger\LoggerFactory service to allow alternate PSR-3 logging implementations to be easily integrated with MediaWiki. The service provider interface allows the backend logging library to be implemented in multiple ways. The $wgMWLoggerDefaultSpi global provides the classname of the default MediaWiki\Logger\Spi implementation to be loaded at runtime. This can either be the name of a class implementing the MediaWiki\Logger\Spi with a zero argument const ructor or a callable that will return an MediaWiki\Logger\Spi instance. Alternately the MediaWiki\Logger\LoggerFactory MediaWiki Logger LoggerFactory
Definition: logger.txt:5
static singleton( $domain=false)
beginMasterChanges( $fname=__METHOD__)
Flush any master transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set)
Definition: LBFactory.php:251
checkMemoryOK()
Make sure that this script is not too close to the memory usage limit.
Definition: JobRunner.php:487
getMainLB( $domain=false)
$content
Definition: pageupdater.txt:72
syncBackoffDeltas(array $backoffs, array &$deltas, $mode='wait')
Merge the current backoff expiries from persistent storage.
Definition: JobRunner.php:447
debugCallback( $msg)
Log the job message.
Definition: JobRunner.php:520
Database error base class.
Definition: DBError.php:30
__construct(LoggerInterface $logger=null)
Definition: JobRunner.php:73