Current File : //www/varak.net/wiki.varak.net/includes/MediaWikiServices.php
<?php
namespace MediaWiki;
use ActorMigration;
use CommentStore;
use Config;
use ConfigFactory;
use CryptHKDF;
use CryptRand;
use EventRelayerGroup;
use GenderCache;
use GlobalVarConfig;
use Hooks;
use IBufferingStatsdDataFactory;
use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface;
use MediaWiki\Http\HttpRequestFactory;
use MediaWiki\Preferences\PreferencesFactory;
use MediaWiki\Shell\CommandFactory;
use MediaWiki\Revision\RevisionRenderer;
use MediaWiki\Special\SpecialPageFactory;
use MediaWiki\Storage\BlobStore;
use MediaWiki\Storage\BlobStoreFactory;
use MediaWiki\Storage\NameTableStore;
use MediaWiki\Storage\NameTableStoreFactory;
use MediaWiki\Revision\RevisionFactory;
use MediaWiki\Revision\RevisionLookup;
use MediaWiki\Revision\RevisionStore;
use OldRevisionImporter;
use MediaWiki\Revision\RevisionStoreFactory;
use UploadRevisionImporter;
use Wikimedia\Rdbms\LBFactory;
use LinkCache;
use Wikimedia\Rdbms\LoadBalancer;
use MediaHandlerFactory;
use MediaWiki\Config\ConfigRepository;
use MediaWiki\Linker\LinkRenderer;
use MediaWiki\Linker\LinkRendererFactory;
use MediaWiki\Services\SalvageableService;
use MediaWiki\Services\ServiceContainer;
use MediaWiki\Services\NoSuchServiceException;
use MWException;
use MimeAnalyzer;
use ObjectCache;
use Parser;
use ParserCache;
use ParserFactory;
use PasswordFactory;
use ProxyLookup;
use SearchEngine;
use SearchEngineConfig;
use SearchEngineFactory;
use SiteLookup;
use SiteStore;
use WatchedItemStoreInterface;
use WatchedItemQueryService;
use SkinFactory;
use TitleFormatter;
use TitleParser;
use VirtualRESTServiceClient;
use MediaWiki\Interwiki\InterwikiLookup;
use MagicWordFactory;
/**
* Service locator for MediaWiki core services.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*
* @since 1.27
*/
/**
* MediaWikiServices is the service locator for the application scope of MediaWiki.
* Its implemented as a simple configurable DI container.
* MediaWikiServices acts as a top level factory/registry for top level services, and builds
* the network of service objects that defines MediaWiki's application logic.
* It acts as an entry point to MediaWiki's dependency injection mechanism.
*
* Services are defined in the "wiring" array passed to the constructor,
* or by calling defineService().
*
* @see docs/injection.txt for an overview of using dependency injection in the
* MediaWiki code base.
*/
class MediaWikiServices extends ServiceContainer {
/**
* @var MediaWikiServices|null
*/
private static $instance = null;
/**
* Returns the global default instance of the top level service locator.
*
* @since 1.27
*
* The default instance is initialized using the service instantiator functions
* defined in ServiceWiring.php.
*
* @note This should only be called by static functions! The instance returned here
* should not be passed around! Objects that need access to a service should have
* that service injected into the constructor, never a service locator!
*
* @return MediaWikiServices
*/
public static function getInstance() {
if ( self::$instance === null ) {
// NOTE: constructing GlobalVarConfig here is not particularly pretty,
// but some information from the global scope has to be injected here,
// even if it's just a file name or database credentials to load
// configuration from.
$bootstrapConfig = new GlobalVarConfig();
self::$instance = self::newInstance( $bootstrapConfig, 'load' );
}
return self::$instance;
}
/**
* Replaces the global MediaWikiServices instance.
*
* @since 1.28
*
* @note This is for use in PHPUnit tests only!
*
* @throws MWException if called outside of PHPUnit tests.
*
* @param MediaWikiServices $services The new MediaWikiServices object.
*
* @return MediaWikiServices The old MediaWikiServices object, so it can be restored later.
*/
public static function forceGlobalInstance( MediaWikiServices $services ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
throw new MWException( __METHOD__ . ' must not be used outside unit tests.' );
}
$old = self::getInstance();
self::$instance = $services;
return $old;
}
/**
* Creates a new instance of MediaWikiServices and sets it as the global default
* instance. getInstance() will return a different MediaWikiServices object
* after every call to resetGlobalInstance().
*
* @since 1.28
*
* @warning This should not be used during normal operation. It is intended for use
* when the configuration has changed significantly since bootstrap time, e.g.
* during the installation process or during testing.
*
* @warning Calling resetGlobalInstance() may leave the application in an inconsistent
* state. Calling this is only safe under the ASSUMPTION that NO REFERENCE to
* any of the services managed by MediaWikiServices exist. If any service objects
* managed by the old MediaWikiServices instance remain in use, they may INTERFERE
* with the operation of the services managed by the new MediaWikiServices.
* Operating with a mix of services created by the old and the new
* MediaWikiServices instance may lead to INCONSISTENCIES and even DATA LOSS!
* Any class implementing LAZY LOADING is especially prone to this problem,
* since instances would typically retain a reference to a storage layer service.
*
* @see forceGlobalInstance()
* @see resetGlobalInstance()
* @see resetBetweenTest()
*
* @param Config|null $bootstrapConfig The Config object to be registered as the
* 'BootstrapConfig' service. This has to contain at least the information
* needed to set up the 'ConfigFactory' service. If not given, the bootstrap
* config of the old instance of MediaWikiServices will be re-used. If there
* was no previous instance, a new GlobalVarConfig object will be used to
* bootstrap the services.
*
* @param string $quick Set this to "quick" to allow expensive resources to be re-used.
* See SalvageableService for details.
*
* @throws MWException If called after MW_SERVICE_BOOTSTRAP_COMPLETE has been defined in
* Setup.php (unless MW_PHPUNIT_TEST or MEDIAWIKI_INSTALL or RUN_MAINTENANCE_IF_MAIN
* is defined).
*/
public static function resetGlobalInstance( Config $bootstrapConfig = null, $quick = '' ) {
if ( self::$instance === null ) {
// no global instance yet, nothing to reset
return;
}
self::failIfResetNotAllowed( __METHOD__ );
if ( $bootstrapConfig === null ) {
$bootstrapConfig = self::$instance->getBootstrapConfig();
}
$oldInstance = self::$instance;
self::$instance = self::newInstance( $bootstrapConfig, 'load' );
self::$instance->importWiring( $oldInstance, [ 'BootstrapConfig' ] );
if ( $quick === 'quick' ) {
self::$instance->salvage( $oldInstance );
} else {
$oldInstance->destroy();
}
}
/**
* Salvages the state of any salvageable service instances in $other.
*
* @note $other will have been destroyed when salvage() returns.
*
* @param MediaWikiServices $other
*/
private function salvage( self $other ) {
foreach ( $this->getServiceNames() as $name ) {
// The service could be new in the new instance and not registered in the
// other instance (e.g. an extension that was loaded after the instantiation of
// the other instance. Skip this service in this case. See T143974
try {
$oldService = $other->peekService( $name );
} catch ( NoSuchServiceException $e ) {
continue;
}
if ( $oldService instanceof SalvageableService ) {
/** @var SalvageableService $newService */
$newService = $this->getService( $name );
$newService->salvage( $oldService );
}
}
$other->destroy();
}
/**
* Creates a new MediaWikiServices instance and initializes it according to the
* given $bootstrapConfig. In particular, all wiring files defined in the
* ServiceWiringFiles setting are loaded, and the MediaWikiServices hook is called.
*
* @param Config|null $bootstrapConfig The Config object to be registered as the
* 'BootstrapConfig' service.
*
* @param string $loadWiring set this to 'load' to load the wiring files specified
* in the 'ServiceWiringFiles' setting in $bootstrapConfig.
*
* @return MediaWikiServices
* @throws MWException
* @throws \FatalError
*/
private static function newInstance( Config $bootstrapConfig, $loadWiring = '' ) {
$instance = new self( $bootstrapConfig );
// Load the default wiring from the specified files.
if ( $loadWiring === 'load' ) {
$wiringFiles = $bootstrapConfig->get( 'ServiceWiringFiles' );
$instance->loadWiringFiles( $wiringFiles );
}
// Provide a traditional hook point to allow extensions to configure services.
Hooks::run( 'MediaWikiServices', [ $instance ] );
return $instance;
}
/**
* Disables all storage layer services. After calling this, any attempt to access the
* storage layer will result in an error. Use resetGlobalInstance() to restore normal
* operation.
*
* @since 1.28
*
* @warning This is intended for extreme situations only and should never be used
* while serving normal web requests. Legitimate use cases for this method include
* the installation process. Test fixtures may also use this, if the fixture relies
* on globalState.
*
* @see resetGlobalInstance()
* @see resetChildProcessServices()
*/
public static function disableStorageBackend() {
// TODO: also disable some Caches, JobQueues, etc
$destroy = [ 'DBLoadBalancer', 'DBLoadBalancerFactory' ];
$services = self::getInstance();
foreach ( $destroy as $name ) {
$services->disableService( $name );
}
ObjectCache::clear();
}
/**
* Resets any services that may have become stale after a child process
* returns from after pcntl_fork(). It's also safe, but generally unnecessary,
* to call this method from the parent process.
*
* @since 1.28
*
* @note This is intended for use in the context of process forking only!
*
* @see resetGlobalInstance()
* @see disableStorageBackend()
*/
public static function resetChildProcessServices() {
// NOTE: for now, just reset everything. Since we don't know the interdependencies
// between services, we can't do this more selectively at this time.
self::resetGlobalInstance();
// Child, reseed because there is no bug in PHP:
// https://bugs.php.net/bug.php?id=42465
mt_srand( getmypid() );
}
/**
* Resets the given service for testing purposes.
*
* @since 1.28
*
* @warning This is generally unsafe! Other services may still retain references
* to the stale service instance, leading to failures and inconsistencies. Subclasses
* may use this method to reset specific services under specific instances, but
* it should not be exposed to application logic.
*
* @note With proper dependency injection used throughout the codebase, this method
* should not be needed. It is provided to allow tests that pollute global service
* instances to clean up.
*
* @param string $name
* @param bool $destroy Whether the service instance should be destroyed if it exists.
* When set to false, any existing service instance will effectively be detached
* from the container.
*
* @throws MWException if called outside of PHPUnit tests.
*/
public function resetServiceForTesting( $name, $destroy = true ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) && !defined( 'MW_PARSER_TEST' ) ) {
throw new MWException( 'resetServiceForTesting() must not be used outside unit tests.' );
}
$this->resetService( $name, $destroy );
}
/**
* Convenience method that throws an exception unless it is called during a phase in which
* resetting of global services is allowed. In general, services should not be reset
* individually, since that may introduce inconsistencies.
*
* @since 1.28
*
* This method will throw an exception if:
*
* - self::$resetInProgress is false (to allow all services to be reset together
* via resetGlobalInstance)
* - and MEDIAWIKI_INSTALL is not defined (to allow services to be reset during installation)
* - and MW_PHPUNIT_TEST is not defined (to allow services to be reset during testing)
*
* This method is intended to be used to safeguard against accidentally resetting
* global service instances that are not yet managed by MediaWikiServices. It is
* defined here in the MediaWikiServices services class to have a central place
* for managing service bootstrapping and resetting.
*
* @param string $method the name of the caller method, as given by __METHOD__.
*
* @throws MWException if called outside bootstrap mode.
*
* @see resetGlobalInstance()
* @see forceGlobalInstance()
* @see disableStorageBackend()
*/
public static function failIfResetNotAllowed( $method ) {
if ( !defined( 'MW_PHPUNIT_TEST' )
&& !defined( 'MW_PARSER_TEST' )
&& !defined( 'MEDIAWIKI_INSTALL' )
&& !defined( 'RUN_MAINTENANCE_IF_MAIN' )
&& defined( 'MW_SERVICE_BOOTSTRAP_COMPLETE' )
) {
throw new MWException( $method . ' may only be called during bootstrapping and unit tests!' );
}
}
/**
* @param Config $config The Config object to be registered as the 'BootstrapConfig' service.
* This has to contain at least the information needed to set up the 'ConfigFactory'
* service.
*/
public function __construct( Config $config ) {
parent::__construct();
// Register the given Config object as the bootstrap config service.
$this->defineService( 'BootstrapConfig', function () use ( $config ) {
return $config;
} );
}
// CONVENIENCE GETTERS ////////////////////////////////////////////////////
/**
* @since 1.31
* @return ActorMigration
*/
public function getActorMigration() {
return $this->getService( 'ActorMigration' );
}
/**
* @since 1.31
* @return BlobStore
*/
public function getBlobStore() {
return $this->getService( '_SqlBlobStore' );
}
/**
* @since 1.31
* @return BlobStoreFactory
*/
public function getBlobStoreFactory() {
return $this->getService( 'BlobStoreFactory' );
}
/**
* Returns the Config object containing the bootstrap configuration.
* Bootstrap configuration would typically include database credentials
* and other information that may be needed before the ConfigFactory
* service can be instantiated.
*
* @note This should only be used during bootstrapping, in particular
* when creating the MainConfig service. Application logic should
* use getMainConfig() to get a Config instances.
*
* @since 1.27
* @return Config
*/
public function getBootstrapConfig() {
return $this->getService( 'BootstrapConfig' );
}
/**
* @since 1.32
* @return NameTableStore
*/
public function getChangeTagDefStore() {
return $this->getService( 'NameTableStoreFactory' )->getChangeTagDef();
}
/**
* @since 1.31
* @return CommentStore
*/
public function getCommentStore() {
return $this->getService( 'CommentStore' );
}
/**
* @since 1.27
* @return ConfigFactory
*/
public function getConfigFactory() {
return $this->getService( 'ConfigFactory' );
}
/**
* @since 1.32
* @return ConfigRepository
*/
public function getConfigRepository() {
return $this->getService( 'ConfigRepository' );
}
/**
* @since 1.29
* @return \ConfiguredReadOnlyMode
*/
public function getConfiguredReadOnlyMode() {
return $this->getService( 'ConfiguredReadOnlyMode' );
}
/**
* @since 1.32
* @return \Language
*/
public function getContentLanguage() {
return $this->getService( 'ContentLanguage' );
}
/**
* @since 1.31
* @return NameTableStore
*/
public function getContentModelStore() {
return $this->getService( 'NameTableStoreFactory' )->getContentModels();
}
/**
* @since 1.28
* @return CryptHKDF
*/
public function getCryptHKDF() {
return $this->getService( 'CryptHKDF' );
}
/**
* @since 1.28
* @deprecated since 1.32, use random_bytes()/random_int()
* @return CryptRand
*/
public function getCryptRand() {
return $this->getService( 'CryptRand' );
}
/**
* @since 1.28
* @return LoadBalancer The main DB load balancer for the local wiki.
*/
public function getDBLoadBalancer() {
return $this->getService( 'DBLoadBalancer' );
}
/**
* @since 1.28
* @return LBFactory
*/
public function getDBLoadBalancerFactory() {
return $this->getService( 'DBLoadBalancerFactory' );
}
/**
* @since 1.27
* @return EventRelayerGroup
*/
public function getEventRelayerGroup() {
return $this->getService( 'EventRelayerGroup' );
}
/**
* @since 1.31
* @return \ExternalStoreFactory
*/
public function getExternalStoreFactory() {
return $this->getService( 'ExternalStoreFactory' );
}
/**
* @since 1.28
* @return GenderCache
*/
public function getGenderCache() {
return $this->getService( 'GenderCache' );
}
/**
* @since 1.31
* @return HttpRequestFactory
*/
public function getHttpRequestFactory() {
return $this->getService( 'HttpRequestFactory' );
}
/**
* @since 1.28
* @return InterwikiLookup
*/
public function getInterwikiLookup() {
return $this->getService( 'InterwikiLookup' );
}
/**
* @since 1.28
* @return LinkCache
*/
public function getLinkCache() {
return $this->getService( 'LinkCache' );
}
/**
* LinkRenderer instance that can be used
* if no custom options are needed
*
* @since 1.28
* @return LinkRenderer
*/
public function getLinkRenderer() {
return $this->getService( 'LinkRenderer' );
}
/**
* @since 1.28
* @return LinkRendererFactory
*/
public function getLinkRendererFactory() {
return $this->getService( 'LinkRendererFactory' );
}
/**
* @since 1.28
* @return \BagOStuff
*/
public function getLocalServerObjectCache() {
return $this->getService( 'LocalServerObjectCache' );
}
/**
* @since 1.32
* @return MagicWordFactory
*/
public function getMagicWordFactory() {
return $this->getService( 'MagicWordFactory' );
}
/**
* Returns the Config object that provides configuration for MediaWiki core.
* This may or may not be the same object that is returned by getBootstrapConfig().
*
* @since 1.27
* @return Config
*/
public function getMainConfig() {
return $this->getService( 'MainConfig' );
}
/**
* @since 1.28
* @return \BagOStuff
*/
public function getMainObjectStash() {
return $this->getService( 'MainObjectStash' );
}
/**
* @since 1.28
* @return \WANObjectCache
*/
public function getMainWANObjectCache() {
return $this->getService( 'MainWANObjectCache' );
}
/**
* @since 1.28
* @return MediaHandlerFactory
*/
public function getMediaHandlerFactory() {
return $this->getService( 'MediaHandlerFactory' );
}
/**
* @since 1.28
* @return MimeAnalyzer
*/
public function getMimeAnalyzer() {
return $this->getService( 'MimeAnalyzer' );
}
/**
* @since 1.32
* @return NameTableStoreFactory
*/
public function getNameTableStoreFactory() {
return $this->getService( 'NameTableStoreFactory' );
}
/**
* @return OldRevisionImporter
*/
public function getOldRevisionImporter() {
return $this->getService( 'OldRevisionImporter' );
}
/**
* @since 1.29
* @return Parser
*/
public function getParser() {
return $this->getService( 'Parser' );
}
/**
* @since 1.30
* @return ParserCache
*/
public function getParserCache() {
return $this->getService( 'ParserCache' );
}
/**
* @since 1.32
* @return ParserFactory
*/
public function getParserFactory() {
return $this->getService( 'ParserFactory' );
}
/**
* @since 1.32
* @return PasswordFactory
*/
public function getPasswordFactory() {
return $this->getService( 'PasswordFactory' );
}
/**
* @since 1.32
* @return StatsdDataFactoryInterface
*/
public function getPerDbNameStatsdDataFactory() {
return $this->getService( 'PerDbNameStatsdDataFactory' );
}
/**
* @since 1.31
* @return PreferencesFactory
*/
public function getPreferencesFactory() {
return $this->getService( 'PreferencesFactory' );
}
/**
* @since 1.28
* @return ProxyLookup
*/
public function getProxyLookup() {
return $this->getService( 'ProxyLookup' );
}
/**
* @since 1.29
* @return \ReadOnlyMode
*/
public function getReadOnlyMode() {
return $this->getService( 'ReadOnlyMode' );
}
/**
* @since 1.31
* @return RevisionFactory
*/
public function getRevisionFactory() {
return $this->getService( 'RevisionFactory' );
}
/**
* @since 1.31
* @return RevisionLookup
*/
public function getRevisionLookup() {
return $this->getService( 'RevisionLookup' );
}
/**
* @since 1.32
* @return RevisionRenderer
*/
public function getRevisionRenderer() {
return $this->getService( 'RevisionRenderer' );
}
/**
* @since 1.31
* @return RevisionStore
*/
public function getRevisionStore() {
return $this->getService( 'RevisionStore' );
}
/**
* @since 1.32
* @return RevisionStoreFactory
*/
public function getRevisionStoreFactory() {
return $this->getService( 'RevisionStoreFactory' );
}
/**
* @since 1.27
* @return SearchEngine
*/
public function newSearchEngine() {
// New engine object every time, since they keep state
return $this->getService( 'SearchEngineFactory' )->create();
}
/**
* @since 1.27
* @return SearchEngineConfig
*/
public function getSearchEngineConfig() {
return $this->getService( 'SearchEngineConfig' );
}
/**
* @since 1.27
* @return SearchEngineFactory
*/
public function getSearchEngineFactory() {
return $this->getService( 'SearchEngineFactory' );
}
/**
* @since 1.30
* @return CommandFactory
*/
public function getShellCommandFactory() {
return $this->getService( 'ShellCommandFactory' );
}
/**
* @since 1.27
* @return SiteLookup
*/
public function getSiteLookup() {
return $this->getService( 'SiteLookup' );
}
/**
* @since 1.27
* @return SiteStore
*/
public function getSiteStore() {
return $this->getService( 'SiteStore' );
}
/**
* @since 1.27
* @return SkinFactory
*/
public function getSkinFactory() {
return $this->getService( 'SkinFactory' );
}
/**
* @since 1.31
* @return NameTableStore
*/
public function getSlotRoleStore() {
return $this->getService( 'NameTableStoreFactory' )->getSlotRoles();
}
/**
* @since 1.32
* @return SpecialPageFactory
*/
public function getSpecialPageFactory() : SpecialPageFactory {
return $this->getService( 'SpecialPageFactory' );
}
/**
* @since 1.27
* @return IBufferingStatsdDataFactory
*/
public function getStatsdDataFactory() {
return $this->getService( 'StatsdDataFactory' );
}
/**
* @since 1.28
* @return TitleFormatter
*/
public function getTitleFormatter() {
return $this->getService( 'TitleFormatter' );
}
/**
* @since 1.28
* @return TitleParser
*/
public function getTitleParser() {
return $this->getService( 'TitleParser' );
}
/**
* @since 1.32
* @return UploadRevisionImporter
*/
public function getUploadRevisionImporter() {
return $this->getService( 'UploadRevisionImporter' );
}
/**
* @since 1.28
* @return VirtualRESTServiceClient
*/
public function getVirtualRESTServiceClient() {
return $this->getService( 'VirtualRESTServiceClient' );
}
/**
* @since 1.28
* @return WatchedItemQueryService
*/
public function getWatchedItemQueryService() {
return $this->getService( 'WatchedItemQueryService' );
}
/**
* @since 1.28
* @return WatchedItemStoreInterface
*/
public function getWatchedItemStore() {
return $this->getService( 'WatchedItemStore' );
}
/**
* @since 1.31
* @return \OldRevisionImporter
*/
public function getWikiRevisionOldRevisionImporter() {
return $this->getService( 'OldRevisionImporter' );
}
/**
* @since 1.31
* @return \OldRevisionImporter
*/
public function getWikiRevisionOldRevisionImporterNoUpdates() {
return $this->getService( 'WikiRevisionOldRevisionImporterNoUpdates' );
}
/**
* @since 1.31
* @return \UploadRevisionImporter
*/
public function getWikiRevisionUploadImporter() {
return $this->getService( 'UploadRevisionImporter' );
}
}
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