mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Gadgets
synced 2024-12-04 19:58:18 +00:00
281 lines
7.9 KiB
PHP
281 lines
7.9 KiB
PHP
<?php
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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 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 = 2;
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/** @var array|false|null */
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private $definitionCache;
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/**
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* @param string $id
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*
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* @return Gadget
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* @throws InvalidArgumentException
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*/
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public function getGadget( $id ) {
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$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 $gadgets[$id];
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}
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public function getGadgetIds() {
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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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} else {
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return [];
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}
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}
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public function handlePageUpdate( LinkTarget $target ) {
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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 if MediaWiki:Gadgets-definition
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* was edited.
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*/
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private function purgeDefinitionCache() {
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$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$cache->touchCheckKey( $this->getDefinitionCacheKey() );
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}
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/**
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* @return string
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*/
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private function getDefinitionCacheKey() {
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$cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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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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* Loads list of gadgets and returns it as associative array of sections with gadgets
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* e.g. [ 'sectionnname1' => [ $gadget1, $gadget2 ],
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* 'sectionnname2' => [ $gadget3 ] ];
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* @return array|false Gadget array or false on failure
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*/
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protected function loadGadgets() {
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if ( $this->definitionCache !== null ) {
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return $this->definitionCache; // process cache hit
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}
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// Ideally $t1Cache is APC, and $wanCache is memcached
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$t1Cache = ObjectCache::getLocalServerInstance( 'hash' );
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$wanCache = MediaWikiServices::getInstance()->getMainWANObjectCache();
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$key = $this->getDefinitionCacheKey();
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// (a) Check the tier 1 cache
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$value = $t1Cache->get( $key );
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// Randomize logical APC expiry to avoid stampedes
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// somewhere between 7.0 and 15.0 (seconds)
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$cutoffAge = mt_rand( 7000000, 15000000 ) / 1000000;
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// Check if it passes a blind TTL check (avoids I/O)
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if ( $value && ( microtime( true ) - $value['time'] ) < $cutoffAge ) {
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$this->definitionCache = $value['gadgets']; // process cache
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return $this->definitionCache;
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}
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// Cache generated after the "check" time should be up-to-date
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$ckTime = $wanCache->getCheckKeyTime( $key ) + WANObjectCache::HOLDOFF_TTL;
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if ( $value && $value['time'] > $ckTime ) {
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$this->definitionCache = $value['gadgets']; // process cache
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return $this->definitionCache;
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}
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// (b) Fetch value from WAN cache or regenerate if needed.
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// This is hit occasionally and more so when the list changes.
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$us = $this;
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$value = $wanCache->getWithSetCallback(
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$key,
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Gadget::CACHE_TTL,
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function ( $old, &$ttl, &$setOpts ) use ( $us ) {
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$setOpts += Database::getCacheSetOptions( wfGetDB( DB_REPLICA ) );
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$now = microtime( true );
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$gadgets = $us->fetchStructuredList();
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if ( $gadgets === false ) {
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$ttl = WANObjectCache::TTL_UNCACHEABLE;
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}
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return [ 'gadgets' => $gadgets, 'time' => $now ];
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},
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[ 'checkKeys' => [ $key ], 'lockTSE' => 300 ]
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);
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// Update the tier 1 cache as needed
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if ( $value['gadgets'] !== false && $value['time'] > $ckTime ) {
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// Set a modest TTL to keep the WAN key in cache
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$t1Cache->set( $key, $value, mt_rand( 300, 600 ) );
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}
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$this->definitionCache = $value['gadgets'];
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return $this->definitionCache;
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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|false
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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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|| $revRecord->getContent( SlotRecord::MAIN )->isEmpty()
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) {
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return false; // don't cache
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}
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$g = $revRecord->getContent( SlotRecord::MAIN )->getNativeData();
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} else {
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$g = $forceNewText;
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}
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$gadgets = $this->listFromDefinition( $g );
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if ( !count( $gadgets ) ) {
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return false; // don't cache; Bug 37228
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}
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$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 Gadget[] List of Gadget objects indexed by the gadget's name.
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*/
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private function listFromDefinition( $definition ) {
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$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;
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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\d ]*[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 MWException 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 '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 '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 '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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}
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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 = "MediaWiki:Gadget-$page";
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if ( 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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