mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Gadgets
synced 2024-11-28 01:00:02 +00:00
295 lines
8.2 KiB
PHP
295 lines
8.2 KiB
PHP
<?php
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namespace MediaWiki\Extension\Gadgets;
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use InvalidArgumentException;
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use MediaWiki\Linker\LinkTarget;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\Revision\SlotRecord;
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use MediaWiki\Title\Title;
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use ObjectCache;
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use TextContent;
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use WANObjectCache;
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use Wikimedia\Rdbms\Database;
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/**
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* Gadgets repo powered by MediaWiki:Gadgets-definition
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*/
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class MediaWikiGadgetsDefinitionRepo extends GadgetRepo {
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private const CACHE_VERSION = 4;
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/** @var array|null */
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private $definitions;
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/** @var string */
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protected $titlePrefix = 'MediaWiki:Gadget-';
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/**
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* @param string $id
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* @throws InvalidArgumentException
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* @return Gadget
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*/
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public function getGadget( string $id ): Gadget {
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$gadgets = $this->loadGadgets();
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if ( !isset( $gadgets[$id] ) ) {
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throw new InvalidArgumentException( "No gadget registered for '$id'" );
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}
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return new Gadget( $gadgets[$id] );
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}
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public function getGadgetIds(): array {
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$gadgets = $this->loadGadgets();
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if ( $gadgets ) {
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return array_keys( $gadgets );
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}
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return [];
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}
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public function handlePageUpdate( LinkTarget $target ): void {
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if ( $target->getNamespace() === NS_MEDIAWIKI && $target->getText() === 'Gadgets-definition' ) {
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$this->purgeDefinitionCache();
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}
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}
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/**
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* Purge the definitions cache, for example when MediaWiki:Gadgets-definition is edited.
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*/
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private function purgeDefinitionCache(): void {
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$wanCache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$srvCache = ObjectCache::getLocalServerInstance( 'hash' );
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$key = $this->makeDefinitionCacheKey( $wanCache );
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$wanCache->delete( $key );
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$srvCache->delete( $key );
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$this->definitions = null;
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}
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/**
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* @param WANObjectCache $cache
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* @return string
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*/
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private function makeDefinitionCacheKey( WANObjectCache $cache ) {
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return $cache->makeKey(
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'gadgets-definition',
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Gadget::GADGET_CLASS_VERSION,
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self::CACHE_VERSION
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);
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}
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/**
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* Get list of gadgets.
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*
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* @return array[] List of Gadget objects
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*/
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protected function loadGadgets(): array {
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if ( defined( 'MW_PHPUNIT_TEST' ) && MediaWikiServices::getInstance()->isStorageDisabled() ) {
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// Bail out immediately if storage is disabled. This should never happen in normal operations, but can
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// happen a lot in tests: this method is called from the UserGetDefaultOptions hook handler, so any test
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// that uses UserOptionsLookup will end up reaching this code, which is problematic if the test is not
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// in the Database group (T155147).
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return [];
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}
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// From back to front:
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//
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// 3. wan cache (e.g. memcached)
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// This improves end-user latency and reduces database load.
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// It is purged when the data changes.
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//
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// 2. server cache (e.g. APCu).
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// Very short blind TTL, mainly to avoid high memcached I/O.
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//
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// 1. process cache. Faster repeat calls.
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if ( $this->definitions === null ) {
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$wanCache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$srvCache = ObjectCache::getLocalServerInstance( 'hash' );
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$key = $this->makeDefinitionCacheKey( $wanCache );
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$this->definitions = $srvCache->getWithSetCallback(
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$key,
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// between 7 and 15 seconds to avoid memcached/lockTSE stampede (T203786)
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mt_rand( 7, 15 ),
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function () use ( $wanCache, $key ) {
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return $wanCache->getWithSetCallback(
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$key,
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// 1 day
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Gadget::CACHE_TTL,
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function ( $old, &$ttl, &$setOpts ) {
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// Reduce caching of known-stale data (T157210)
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$setOpts += Database::getCacheSetOptions( wfGetDB( DB_REPLICA ) );
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return $this->fetchStructuredList();
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},
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[
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'version' => 2,
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// Avoid database stampede
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'lockTSE' => 300,
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]
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);
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}
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);
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}
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return $this->definitions;
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}
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/**
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* Fetch list of gadgets and returns it as associative array of sections with gadgets
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* e.g. [ $name => $gadget1, etc. ]
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* @param string|null $forceNewText Injected text of MediaWiki:gadgets-definition [optional]
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* @return array[]
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*/
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public function fetchStructuredList( $forceNewText = null ) {
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if ( $forceNewText === null ) {
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// T157210: avoid using wfMessage() to avoid staleness due to cache layering
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$title = Title::makeTitle( NS_MEDIAWIKI, 'Gadgets-definition' );
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$revRecord = MediaWikiServices::getInstance()
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->getRevisionLookup()
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->getRevisionByTitle( $title );
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if ( !$revRecord
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|| !$revRecord->getContent( SlotRecord::MAIN )
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|| $revRecord->getContent( SlotRecord::MAIN )->isEmpty()
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) {
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return [];
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}
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$content = $revRecord->getContent( SlotRecord::MAIN );
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$g = ( $content instanceof TextContent ) ? $content->getText() : '';
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} else {
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$g = $forceNewText;
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}
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$gadgets = $this->listFromDefinition( $g );
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$source = $forceNewText !== null ? 'input text' : 'MediaWiki:Gadgets-definition';
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wfDebug( __METHOD__ . ": $source parsed, cache entry should be updated\n" );
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return $gadgets;
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}
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/**
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* Generates a structured list of Gadget objects from a definition
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*
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* @param string $definition
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* @return array[] List of Gadget objects indexed by the gadget's name.
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*/
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private function listFromDefinition( $definition ): array {
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$definition = preg_replace( '/<!--.*?-->/s', '', $definition );
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$lines = preg_split( '/(\r\n|\r|\n)+/', $definition );
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$gadgets = [];
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$section = '';
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foreach ( $lines as $line ) {
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$m = [];
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if ( preg_match( '/^==+ *([^*:\s|]+?)\s*==+\s*$/', $line, $m ) ) {
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$section = $m[1];
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} else {
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$gadget = $this->newFromDefinition( $line, $section );
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if ( $gadget ) {
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$gadgets[$gadget->getName()] = $gadget->toArray();
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}
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}
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}
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return $gadgets;
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}
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/**
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* Creates an instance of this class from definition in MediaWiki:Gadgets-definition
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* @param string $definition Gadget definition
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* @param string $category
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* @return Gadget|false Instance of Gadget class or false if $definition is invalid
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*/
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public function newFromDefinition( $definition, $category ) {
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$m = [];
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if ( !preg_match(
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'/^\*+ *([a-zA-Z](?:[-_:.\w ]*[a-zA-Z0-9])?)(\s*\[.*?\])?\s*((\|[^|]*)+)\s*$/',
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$definition,
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$m
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) ) {
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return false;
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}
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// NOTE: the gadget name is used as part of the name of a form field,
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// and must follow the rules defined in https://www.w3.org/TR/html4/types.html#type-cdata
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// Also, title-normalization applies.
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$info = [ 'category' => $category ];
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$info['name'] = trim( str_replace( ' ', '_', $m[1] ) );
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// If the name is too long, then RL will throw an exception when
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// we try to register the module
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if ( !Gadget::isValidGadgetID( $info['name'] ) ) {
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return false;
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}
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$info['definition'] = $definition;
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$options = trim( $m[2], ' []' );
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foreach ( preg_split( '/\s*\|\s*/', $options, -1, PREG_SPLIT_NO_EMPTY ) as $option ) {
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$arr = preg_split( '/\s*=\s*/', $option, 2 );
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$option = $arr[0];
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if ( isset( $arr[1] ) ) {
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$params = explode( ',', $arr[1] );
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$params = array_map( 'trim', $params );
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} else {
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$params = [];
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}
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switch ( $option ) {
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case 'ResourceLoader':
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$info['resourceLoaded'] = true;
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break;
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case 'requiresES6':
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$info['requiresES6'] = true;
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break;
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case 'dependencies':
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$info['dependencies'] = $params;
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break;
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case 'peers':
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$info['peers'] = $params;
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break;
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case 'rights':
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$info['requiredRights'] = $params;
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break;
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case 'hidden':
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$info['hidden'] = true;
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break;
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case 'actions':
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$info['requiredActions'] = $params;
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break;
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case 'skins':
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$info['requiredSkins'] = $params;
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break;
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case 'default':
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$info['onByDefault'] = true;
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break;
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case 'package':
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$info['package'] = true;
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break;
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case 'targets':
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$info['targets'] = $params;
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break;
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case 'type':
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// Single value, not a list
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$info['type'] = $params[0] ?? '';
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break;
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case 'supportsUrlLoad':
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$val = $params[0] ?? '';
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$info['supportsUrlLoad'] = $val !== 'false';
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break;
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}
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}
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foreach ( preg_split( '/\s*\|\s*/', $m[3], -1, PREG_SPLIT_NO_EMPTY ) as $page ) {
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$page = $this->titlePrefix . $page;
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if ( preg_match( '/\.json$/', $page ) ) {
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$info['datas'][] = $page;
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} elseif ( preg_match( '/\.js/', $page ) ) {
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$info['scripts'][] = $page;
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} elseif ( preg_match( '/\.css/', $page ) ) {
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$info['styles'][] = $page;
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}
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}
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return new Gadget( $info );
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}
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}
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