MediaWiki  1.30.0
MySqlLockManager.php
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1 <?php
2 
5 
20  protected $lockTypeMap = [
21  self::LOCK_SH => self::LOCK_SH,
22  self::LOCK_UW => self::LOCK_SH,
23  self::LOCK_EX => self::LOCK_EX
24  ];
25 
26  public function __construct( array $config ) {
27  parent::__construct( $config );
28 
29  $this->session = substr( $this->session, 0, 31 ); // fit to field
30  }
31 
32  protected function initConnection( $lockDb, IDatabase $db ) {
33  # Let this transaction see lock rows from other transactions
34  $db->query( "SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;" );
35  # Do everything in a transaction as it all gets rolled back eventually
36  $db->startAtomic( __CLASS__ );
37  }
38 
49  protected function doGetLocksOnServer( $lockSrv, array $paths, $type ) {
51 
52  $db = $this->getConnection( $lockSrv ); // checked in isServerUp()
53 
54  $keys = []; // list of hash keys for the paths
55  $data = []; // list of rows to insert
56  $checkEXKeys = []; // list of hash keys that this has no EX lock on
57  # Build up values for INSERT clause
58  foreach ( $paths as $path ) {
59  $key = $this->sha1Base36Absolute( $path );
60  $keys[] = $key;
61  $data[] = [ 'fls_key' => $key, 'fls_session' => $this->session ];
62  if ( !isset( $this->locksHeld[$path][self::LOCK_EX] ) ) {
63  $checkEXKeys[] = $key; // this has no EX lock on $key itself
64  }
65  }
66 
67  # Block new writers (both EX and SH locks leave entries here)...
68  $db->insert( 'filelocks_shared', $data, __METHOD__, [ 'IGNORE' ] );
69  # Actually do the locking queries...
70  if ( $type == self::LOCK_SH ) { // reader locks
71  # Bail if there are any existing writers...
72  if ( count( $checkEXKeys ) ) {
73  $blocked = $db->selectField(
74  'filelocks_exclusive',
75  '1',
76  [ 'fle_key' => $checkEXKeys ],
77  __METHOD__
78  );
79  } else {
80  $blocked = false;
81  }
82  # Other prospective writers that haven't yet updated filelocks_exclusive
83  # will recheck filelocks_shared after doing so and bail due to this entry.
84  } else { // writer locks
85  $encSession = $db->addQuotes( $this->session );
86  # Bail if there are any existing writers...
87  # This may detect readers, but the safe check for them is below.
88  # Note: if two writers come at the same time, both bail :)
89  $blocked = $db->selectField(
90  'filelocks_shared',
91  '1',
92  [ 'fls_key' => $keys, "fls_session != $encSession" ],
93  __METHOD__
94  );
95  if ( !$blocked ) {
96  # Build up values for INSERT clause
97  $data = [];
98  foreach ( $keys as $key ) {
99  $data[] = [ 'fle_key' => $key ];
100  }
101  # Block new readers/writers...
102  $db->insert( 'filelocks_exclusive', $data, __METHOD__ );
103  # Bail if there are any existing readers...
104  $blocked = $db->selectField(
105  'filelocks_shared',
106  '1',
107  [ 'fls_key' => $keys, "fls_session != $encSession" ],
108  __METHOD__
109  );
110  }
111  }
112 
113  if ( $blocked ) {
114  foreach ( $paths as $path ) {
115  $status->fatal( 'lockmanager-fail-acquirelock', $path );
116  }
117  }
118 
119  return $status;
120  }
121 
126  protected function releaseAllLocks() {
128 
129  foreach ( $this->conns as $lockDb => $db ) {
130  if ( $db->trxLevel() ) { // in transaction
131  try {
132  $db->rollback( __METHOD__ ); // finish transaction and kill any rows
133  } catch ( DBError $e ) {
134  $status->fatal( 'lockmanager-fail-db-release', $lockDb );
135  }
136  }
137  }
138 
139  return $status;
140  }
141 }
MySqlLockManager\__construct
__construct(array $config)
Construct a new instance from configuration.
Definition: MySqlLockManager.php:26
Wikimedia\Rdbms\IDatabase\query
query( $sql, $fname=__METHOD__, $tempIgnore=false)
Run an SQL query and return the result.
LockManager\LOCK_SH
const LOCK_SH
Lock types; stronger locks have higher values.
Definition: LockManager.php:67
captcha-old.count
count
Definition: captcha-old.py:249
$status
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. '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 'DatabaseOraclePostInit':Called after initialising an Oracle database $db:the DatabaseOracle object '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). '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:1245
use
as see the revision history and available at free of to any person obtaining a copy of this software and associated documentation to deal in the Software without including without limitation the rights to use
Definition: MIT-LICENSE.txt:10
MySqlLockManager\releaseAllLocks
releaseAllLocks()
Definition: MySqlLockManager.php:126
Wikimedia\Rdbms\DBError
Database error base class.
Definition: DBError.php:30
php
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
Wikimedia\Rdbms\IDatabase
Basic database interface for live and lazy-loaded relation database handles.
Definition: IDatabase.php:40
LockManager\sha1Base36Absolute
sha1Base36Absolute( $path)
Get the base 36 SHA-1 of a string, padded to 31 digits.
Definition: LockManager.php:177
MySqlLockManager\initConnection
initConnection( $lockDb, IDatabase $db)
Do additional initialization for new lock DB connection.
Definition: MySqlLockManager.php:32
$e
div flags Integer display flags(NO_ACTION_LINK, NO_EXTRA_USER_LINKS) 'LogException' returning false will NOT prevent logging $e
Definition: hooks.txt:2141
MySqlLockManager\doGetLocksOnServer
doGetLocksOnServer( $lockSrv, array $paths, $type)
Get a connection to a lock DB and acquire locks on $paths.
Definition: MySqlLockManager.php:49
StatusValue\newGood
static newGood( $value=null)
Factory function for good results.
Definition: StatusValue.php:81
LockManager\$session
string $session
Random 32-char hex number.
Definition: LockManager.php:64
MySqlLockManager\$lockTypeMap
array $lockTypeMap
Mapping of lock types to the type actually used.
Definition: MySqlLockManager.php:20
MySqlLockManager
MySQL version of DBLockManager that supports shared locks.
Definition: MySqlLockManager.php:18
$path
$path
Definition: NoLocalSettings.php:26
as
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
$keys
$keys
Definition: testCompression.php:65
DBLockManager\getConnection
getConnection( $lockDb)
Get (or reuse) a connection to a lock DB.
Definition: DBLockManager.php:147
DBLockManager
Version of LockManager based on using named/row DB locks.
Definition: DBLockManager.php:42
LockManager\LOCK_EX
const LOCK_EX
Definition: LockManager.php:69
array
the array() calling protocol came about after MediaWiki 1.4rc1.
Wikimedia\Rdbms\IDatabase\startAtomic
startAtomic( $fname=__METHOD__)
Begin an atomic section of statements.
$type
$type
Definition: testCompression.php:48