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Diffstat (limited to 'includes/cache/LocalisationCache.php')
| -rw-r--r-- | includes/cache/LocalisationCache.php | 1288 |
1 files changed, 1288 insertions, 0 deletions
diff --git a/includes/cache/LocalisationCache.php b/includes/cache/LocalisationCache.php new file mode 100644 index 00000000..009b9507 --- /dev/null +++ b/includes/cache/LocalisationCache.php @@ -0,0 +1,1288 @@ +<?php +/** + * Cache of the contents of localisation files. + * + * 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 + */ + +define( 'MW_LC_VERSION', 2 ); + +/** + * Class for caching the contents of localisation files, Messages*.php + * and *.i18n.php. + * + * An instance of this class is available using Language::getLocalisationCache(). + * + * The values retrieved from here are merged, containing items from extension + * files, core messages files and the language fallback sequence (e.g. zh-cn -> + * zh-hans -> en ). Some common errors are corrected, for example namespace + * names with spaces instead of underscores, but heavyweight processing, such + * as grammatical transformation, is done by the caller. + */ +class LocalisationCache { + /** Configuration associative array */ + var $conf; + + /** + * True if recaching should only be done on an explicit call to recache(). + * Setting this reduces the overhead of cache freshness checking, which + * requires doing a stat() for every extension i18n file. + */ + var $manualRecache = false; + + /** + * True to treat all files as expired until they are regenerated by this object. + */ + var $forceRecache = false; + + /** + * The cache data. 3-d array, where the first key is the language code, + * the second key is the item key e.g. 'messages', and the third key is + * an item specific subkey index. Some items are not arrays and so for those + * items, there are no subkeys. + */ + var $data = array(); + + /** + * The persistent store object. An instance of LCStore. + * + * @var LCStore + */ + var $store; + + /** + * A 2-d associative array, code/key, where presence indicates that the item + * is loaded. Value arbitrary. + * + * For split items, if set, this indicates that all of the subitems have been + * loaded. + */ + var $loadedItems = array(); + + /** + * A 3-d associative array, code/key/subkey, where presence indicates that + * the subitem is loaded. Only used for the split items, i.e. messages. + */ + var $loadedSubitems = array(); + + /** + * An array where presence of a key indicates that that language has been + * initialised. Initialisation includes checking for cache expiry and doing + * any necessary updates. + */ + var $initialisedLangs = array(); + + /** + * An array mapping non-existent pseudo-languages to fallback languages. This + * is filled by initShallowFallback() when data is requested from a language + * that lacks a Messages*.php file. + */ + var $shallowFallbacks = array(); + + /** + * An array where the keys are codes that have been recached by this instance. + */ + var $recachedLangs = array(); + + /** + * All item keys + */ + static public $allKeys = array( + 'fallback', 'namespaceNames', 'bookstoreList', + 'magicWords', 'messages', 'rtl', 'capitalizeAllNouns', 'digitTransformTable', + 'separatorTransformTable', 'fallback8bitEncoding', 'linkPrefixExtension', + 'linkTrail', 'namespaceAliases', + 'dateFormats', 'datePreferences', 'datePreferenceMigrationMap', + 'defaultDateFormat', 'extraUserToggles', 'specialPageAliases', + 'imageFiles', 'preloadedMessages', 'namespaceGenderAliases', + 'digitGroupingPattern', 'pluralRules', 'compiledPluralRules', + ); + + /** + * Keys for items which consist of associative arrays, which may be merged + * by a fallback sequence. + */ + static public $mergeableMapKeys = array( 'messages', 'namespaceNames', + 'dateFormats', 'imageFiles', 'preloadedMessages' + ); + + /** + * Keys for items which are a numbered array. + */ + static public $mergeableListKeys = array( 'extraUserToggles' ); + + /** + * Keys for items which contain an array of arrays of equivalent aliases + * for each subitem. The aliases may be merged by a fallback sequence. + */ + static public $mergeableAliasListKeys = array( 'specialPageAliases' ); + + /** + * Keys for items which contain an associative array, and may be merged if + * the primary value contains the special array key "inherit". That array + * key is removed after the first merge. + */ + static public $optionalMergeKeys = array( 'bookstoreList' ); + + /** + * Keys for items that are formatted like $magicWords + */ + static public $magicWordKeys = array( 'magicWords' ); + + /** + * Keys for items where the subitems are stored in the backend separately. + */ + static public $splitKeys = array( 'messages' ); + + /** + * Keys which are loaded automatically by initLanguage() + */ + static public $preloadedKeys = array( 'dateFormats', 'namespaceNames' ); + + /** + * Associative array of cached plural rules. The key is the language code, + * the value is an array of plural rules for that language. + */ + var $pluralRules = null; + + var $mergeableKeys = null; + + /** + * Constructor. + * For constructor parameters, see the documentation in DefaultSettings.php + * for $wgLocalisationCacheConf. + * + * @param $conf Array + * @throws MWException + */ + function __construct( $conf ) { + global $wgCacheDirectory; + + $this->conf = $conf; + $storeConf = array(); + if ( !empty( $conf['storeClass'] ) ) { + $storeClass = $conf['storeClass']; + } else { + switch ( $conf['store'] ) { + case 'files': + case 'file': + $storeClass = 'LCStore_CDB'; + break; + case 'db': + $storeClass = 'LCStore_DB'; + break; + case 'accel': + $storeClass = 'LCStore_Accel'; + break; + case 'detect': + $storeClass = $wgCacheDirectory ? 'LCStore_CDB' : 'LCStore_DB'; + break; + default: + throw new MWException( + 'Please set $wgLocalisationCacheConf[\'store\'] to something sensible.' ); + } + } + + wfDebug( get_class( $this ) . ": using store $storeClass\n" ); + if ( !empty( $conf['storeDirectory'] ) ) { + $storeConf['directory'] = $conf['storeDirectory']; + } + + $this->store = new $storeClass( $storeConf ); + foreach ( array( 'manualRecache', 'forceRecache' ) as $var ) { + if ( isset( $conf[$var] ) ) { + $this->$var = $conf[$var]; + } + } + } + + /** + * Returns true if the given key is mergeable, that is, if it is an associative + * array which can be merged through a fallback sequence. + * @param $key + * @return bool + */ + public function isMergeableKey( $key ) { + if ( $this->mergeableKeys === null ) { + $this->mergeableKeys = array_flip( array_merge( + self::$mergeableMapKeys, + self::$mergeableListKeys, + self::$mergeableAliasListKeys, + self::$optionalMergeKeys, + self::$magicWordKeys + ) ); + } + return isset( $this->mergeableKeys[$key] ); + } + + /** + * Get a cache item. + * + * Warning: this may be slow for split items (messages), since it will + * need to fetch all of the subitems from the cache individually. + * @param $code + * @param $key + * @return mixed + */ + public function getItem( $code, $key ) { + if ( !isset( $this->loadedItems[$code][$key] ) ) { + wfProfileIn( __METHOD__ . '-load' ); + $this->loadItem( $code, $key ); + wfProfileOut( __METHOD__ . '-load' ); + } + + if ( $key === 'fallback' && isset( $this->shallowFallbacks[$code] ) ) { + return $this->shallowFallbacks[$code]; + } + + return $this->data[$code][$key]; + } + + /** + * Get a subitem, for instance a single message for a given language. + * @param $code + * @param $key + * @param $subkey + * @return null + */ + public function getSubitem( $code, $key, $subkey ) { + if ( !isset( $this->loadedSubitems[$code][$key][$subkey] ) && + !isset( $this->loadedItems[$code][$key] ) ) { + wfProfileIn( __METHOD__ . '-load' ); + $this->loadSubitem( $code, $key, $subkey ); + wfProfileOut( __METHOD__ . '-load' ); + } + + if ( isset( $this->data[$code][$key][$subkey] ) ) { + return $this->data[$code][$key][$subkey]; + } else { + return null; + } + } + + /** + * Get the list of subitem keys for a given item. + * + * This is faster than array_keys($lc->getItem(...)) for the items listed in + * self::$splitKeys. + * + * Will return null if the item is not found, or false if the item is not an + * array. + * @param $code + * @param $key + * @return bool|null|string + */ + public function getSubitemList( $code, $key ) { + if ( in_array( $key, self::$splitKeys ) ) { + return $this->getSubitem( $code, 'list', $key ); + } else { + $item = $this->getItem( $code, $key ); + if ( is_array( $item ) ) { + return array_keys( $item ); + } else { + return false; + } + } + } + + /** + * Load an item into the cache. + * @param $code + * @param $key + */ + protected function loadItem( $code, $key ) { + if ( !isset( $this->initialisedLangs[$code] ) ) { + $this->initLanguage( $code ); + } + + // Check to see if initLanguage() loaded it for us + if ( isset( $this->loadedItems[$code][$key] ) ) { + return; + } + + if ( isset( $this->shallowFallbacks[$code] ) ) { + $this->loadItem( $this->shallowFallbacks[$code], $key ); + return; + } + + if ( in_array( $key, self::$splitKeys ) ) { + $subkeyList = $this->getSubitem( $code, 'list', $key ); + foreach ( $subkeyList as $subkey ) { + if ( isset( $this->data[$code][$key][$subkey] ) ) { + continue; + } + $this->data[$code][$key][$subkey] = $this->getSubitem( $code, $key, $subkey ); + } + } else { + $this->data[$code][$key] = $this->store->get( $code, $key ); + } + + $this->loadedItems[$code][$key] = true; + } + + /** + * Load a subitem into the cache + * @param $code + * @param $key + * @param $subkey + * @return + */ + protected function loadSubitem( $code, $key, $subkey ) { + if ( !in_array( $key, self::$splitKeys ) ) { + $this->loadItem( $code, $key ); + return; + } + + if ( !isset( $this->initialisedLangs[$code] ) ) { + $this->initLanguage( $code ); + } + + // Check to see if initLanguage() loaded it for us + if ( isset( $this->loadedItems[$code][$key] ) || + isset( $this->loadedSubitems[$code][$key][$subkey] ) ) { + return; + } + + if ( isset( $this->shallowFallbacks[$code] ) ) { + $this->loadSubitem( $this->shallowFallbacks[$code], $key, $subkey ); + return; + } + + $value = $this->store->get( $code, "$key:$subkey" ); + $this->data[$code][$key][$subkey] = $value; + $this->loadedSubitems[$code][$key][$subkey] = true; + } + + /** + * Returns true if the cache identified by $code is missing or expired. + * @return bool + */ + public function isExpired( $code ) { + if ( $this->forceRecache && !isset( $this->recachedLangs[$code] ) ) { + wfDebug( __METHOD__ . "($code): forced reload\n" ); + return true; + } + + $deps = $this->store->get( $code, 'deps' ); + $keys = $this->store->get( $code, 'list' ); + $preload = $this->store->get( $code, 'preload' ); + // Different keys may expire separately, at least in LCStore_Accel + if ( $deps === null || $keys === null || $preload === null ) { + wfDebug( __METHOD__ . "($code): cache missing, need to make one\n" ); + return true; + } + + foreach ( $deps as $dep ) { + // Because we're unserializing stuff from cache, we + // could receive objects of classes that don't exist + // anymore (e.g. uninstalled extensions) + // When this happens, always expire the cache + if ( !$dep instanceof CacheDependency || $dep->isExpired() ) { + wfDebug( __METHOD__ . "($code): cache for $code expired due to " . + get_class( $dep ) . "\n" ); + return true; + } + } + + return false; + } + + /** + * Initialise a language in this object. Rebuild the cache if necessary. + * @param $code + * @throws MWException + */ + protected function initLanguage( $code ) { + if ( isset( $this->initialisedLangs[$code] ) ) { + return; + } + + $this->initialisedLangs[$code] = true; + + # If the code is of the wrong form for a Messages*.php file, do a shallow fallback + if ( !Language::isValidBuiltInCode( $code ) ) { + $this->initShallowFallback( $code, 'en' ); + return; + } + + # Recache the data if necessary + if ( !$this->manualRecache && $this->isExpired( $code ) ) { + if ( file_exists( Language::getMessagesFileName( $code ) ) ) { + $this->recache( $code ); + } elseif ( $code === 'en' ) { + throw new MWException( 'MessagesEn.php is missing.' ); + } else { + $this->initShallowFallback( $code, 'en' ); + } + return; + } + + # Preload some stuff + $preload = $this->getItem( $code, 'preload' ); + if ( $preload === null ) { + if ( $this->manualRecache ) { + // No Messages*.php file. Do shallow fallback to en. + if ( $code === 'en' ) { + throw new MWException( 'No localisation cache found for English. ' . + 'Please run maintenance/rebuildLocalisationCache.php.' ); + } + $this->initShallowFallback( $code, 'en' ); + return; + } else { + throw new MWException( 'Invalid or missing localisation cache.' ); + } + } + $this->data[$code] = $preload; + foreach ( $preload as $key => $item ) { + if ( in_array( $key, self::$splitKeys ) ) { + foreach ( $item as $subkey => $subitem ) { + $this->loadedSubitems[$code][$key][$subkey] = true; + } + } else { + $this->loadedItems[$code][$key] = true; + } + } + } + + /** + * Create a fallback from one language to another, without creating a + * complete persistent cache. + * @param $primaryCode + * @param $fallbackCode + */ + public function initShallowFallback( $primaryCode, $fallbackCode ) { + $this->data[$primaryCode] =& $this->data[$fallbackCode]; + $this->loadedItems[$primaryCode] =& $this->loadedItems[$fallbackCode]; + $this->loadedSubitems[$primaryCode] =& $this->loadedSubitems[$fallbackCode]; + $this->shallowFallbacks[$primaryCode] = $fallbackCode; + } + + /** + * Read a PHP file containing localisation data. + * @param $_fileName + * @param $_fileType + * @throws MWException + * @return array + */ + protected function readPHPFile( $_fileName, $_fileType ) { + // Disable APC caching + $_apcEnabled = ini_set( 'apc.cache_by_default', '0' ); + include( $_fileName ); + ini_set( 'apc.cache_by_default', $_apcEnabled ); + + if ( $_fileType == 'core' || $_fileType == 'extension' ) { + $data = compact( self::$allKeys ); + } elseif ( $_fileType == 'aliases' ) { + $data = compact( 'aliases' ); + } else { + throw new MWException( __METHOD__ . ": Invalid file type: $_fileType" ); + } + return $data; + } + + /** + * Get the compiled plural rules for a given language from the XML files. + * @since 1.20 + */ + public function getCompiledPluralRules( $code ) { + $rules = $this->getPluralRules( $code ); + if ( $rules === null ) { + return null; + } + try { + $compiledRules = CLDRPluralRuleEvaluator::compile( $rules ); + } catch( CLDRPluralRuleError $e ) { + wfDebugLog( 'l10n', $e->getMessage() . "\n" ); + return array(); + } + return $compiledRules; + } + + /** + * Get the plural rules for a given language from the XML files. + * Cached. + * @since 1.20 + */ + public function getPluralRules( $code ) { + global $IP; + + if ( $this->pluralRules === null ) { + $cldrPlural = "$IP/languages/data/plurals.xml"; + $mwPlural = "$IP/languages/data/plurals-mediawiki.xml"; + // Load CLDR plural rules + $this->loadPluralFile( $cldrPlural ); + if ( file_exists( $mwPlural ) ) { + // Override or extend + $this->loadPluralFile( $mwPlural ); + } + } + if ( !isset( $this->pluralRules[$code] ) ) { + return null; + } else { + return $this->pluralRules[$code]; + } + } + + /** + * Load a plural XML file with the given filename, compile the relevant + * rules, and save the compiled rules in a process-local cache. + */ + protected function loadPluralFile( $fileName ) { + $doc = new DOMDocument; + $doc->load( $fileName ); + $rulesets = $doc->getElementsByTagName( "pluralRules" ); + foreach ( $rulesets as $ruleset ) { + $codes = $ruleset->getAttribute( 'locales' ); + $rules = array(); + $ruleElements = $ruleset->getElementsByTagName( "pluralRule" ); + foreach ( $ruleElements as $elt ) { + $rules[] = $elt->nodeValue; + } + foreach ( explode( ' ', $codes ) as $code ) { + $this->pluralRules[$code] = $rules; + } + } + } + + /** + * Read the data from the source files for a given language, and register + * the relevant dependencies in the $deps array. If the localisation + * exists, the data array is returned, otherwise false is returned. + */ + protected function readSourceFilesAndRegisterDeps( $code, &$deps ) { + global $IP; + + $fileName = Language::getMessagesFileName( $code ); + if ( !file_exists( $fileName ) ) { + return false; + } + + $deps[] = new FileDependency( $fileName ); + $data = $this->readPHPFile( $fileName, 'core' ); + + # Load CLDR plural rules for JavaScript + $data['pluralRules'] = $this->getPluralRules( $code ); + # And for PHP + $data['compiledPluralRules'] = $this->getCompiledPluralRules( $code ); + + $deps['plurals'] = new FileDependency( "$IP/languages/data/plurals.xml" ); + $deps['plurals-mw'] = new FileDependency( "$IP/languages/data/plurals-mediawiki.xml" ); + + return $data; + } + + /** + * Merge two localisation values, a primary and a fallback, overwriting the + * primary value in place. + * @param $key + * @param $value + * @param $fallbackValue + */ + protected function mergeItem( $key, &$value, $fallbackValue ) { + if ( !is_null( $value ) ) { + if ( !is_null( $fallbackValue ) ) { + if ( in_array( $key, self::$mergeableMapKeys ) ) { + $value = $value + $fallbackValue; + } elseif ( in_array( $key, self::$mergeableListKeys ) ) { + $value = array_unique( array_merge( $fallbackValue, $value ) ); + } elseif ( in_array( $key, self::$mergeableAliasListKeys ) ) { + $value = array_merge_recursive( $value, $fallbackValue ); + } elseif ( in_array( $key, self::$optionalMergeKeys ) ) { + if ( !empty( $value['inherit'] ) ) { + $value = array_merge( $fallbackValue, $value ); + } + + if ( isset( $value['inherit'] ) ) { + unset( $value['inherit'] ); + } + } elseif ( in_array( $key, self::$magicWordKeys ) ) { + $this->mergeMagicWords( $value, $fallbackValue ); + } + } + } else { + $value = $fallbackValue; + } + } + + /** + * @param $value + * @param $fallbackValue + */ + protected function mergeMagicWords( &$value, $fallbackValue ) { + foreach ( $fallbackValue as $magicName => $fallbackInfo ) { + if ( !isset( $value[$magicName] ) ) { + $value[$magicName] = $fallbackInfo; + } else { + $oldSynonyms = array_slice( $fallbackInfo, 1 ); + $newSynonyms = array_slice( $value[$magicName], 1 ); + $synonyms = array_values( array_unique( array_merge( + $newSynonyms, $oldSynonyms ) ) ); + $value[$magicName] = array_merge( array( $fallbackInfo[0] ), $synonyms ); + } + } + } + + /** + * Given an array mapping language code to localisation value, such as is + * found in extension *.i18n.php files, iterate through a fallback sequence + * to merge the given data with an existing primary value. + * + * Returns true if any data from the extension array was used, false + * otherwise. + * @param $codeSequence + * @param $key + * @param $value + * @param $fallbackValue + * @return bool + */ + protected function mergeExtensionItem( $codeSequence, $key, &$value, $fallbackValue ) { + $used = false; + foreach ( $codeSequence as $code ) { + if ( isset( $fallbackValue[$code] ) ) { + $this->mergeItem( $key, $value, $fallbackValue[$code] ); + $used = true; + } + } + + return $used; + } + + /** + * Load localisation data for a given language for both core and extensions + * and save it to the persistent cache store and the process cache + * @param $code + * @throws MWException + */ + public function recache( $code ) { + global $wgExtensionMessagesFiles; + wfProfileIn( __METHOD__ ); + + if ( !$code ) { + throw new MWException( "Invalid language code requested" ); + } + $this->recachedLangs[$code] = true; + + # Initial values + $initialData = array_combine( + self::$allKeys, + array_fill( 0, count( self::$allKeys ), null ) ); + $coreData = $initialData; + $deps = array(); + + # Load the primary localisation from the source file + $data = $this->readSourceFilesAndRegisterDeps( $code, $deps ); + if ( $data === false ) { + wfDebug( __METHOD__ . ": no localisation file for $code, using fallback to en\n" ); + $coreData['fallback'] = 'en'; + } else { + wfDebug( __METHOD__ . ": got localisation for $code from source\n" ); + + # Merge primary localisation + foreach ( $data as $key => $value ) { + $this->mergeItem( $key, $coreData[$key], $value ); + } + + } + + # Fill in the fallback if it's not there already + if ( is_null( $coreData['fallback'] ) ) { + $coreData['fallback'] = $code === 'en' ? false : 'en'; + } + if ( $coreData['fallback'] === false ) { + $coreData['fallbackSequence'] = array(); + } else { + $coreData['fallbackSequence'] = array_map( 'trim', explode( ',', $coreData['fallback'] ) ); + $len = count( $coreData['fallbackSequence'] ); + + # Ensure that the sequence ends at en + if ( $coreData['fallbackSequence'][$len - 1] !== 'en' ) { + $coreData['fallbackSequence'][] = 'en'; + } + + # Load the fallback localisation item by item and merge it + foreach ( $coreData['fallbackSequence'] as $fbCode ) { + # Load the secondary localisation from the source file to + # avoid infinite cycles on cyclic fallbacks + $fbData = $this->readSourceFilesAndRegisterDeps( $fbCode, $deps ); + if ( $fbData === false ) { + continue; + } + + foreach ( self::$allKeys as $key ) { + if ( !isset( $fbData[$key] ) ) { + continue; + } + + if ( is_null( $coreData[$key] ) || $this->isMergeableKey( $key ) ) { + $this->mergeItem( $key, $coreData[$key], $fbData[$key] ); + } + } + } + } + + $codeSequence = array_merge( array( $code ), $coreData['fallbackSequence'] ); + + # Load the extension localisations + # This is done after the core because we know the fallback sequence now. + # But it has a higher precedence for merging so that we can support things + # like site-specific message overrides. + $allData = $initialData; + foreach ( $wgExtensionMessagesFiles as $fileName ) { + $data = $this->readPHPFile( $fileName, 'extension' ); + $used = false; + + foreach ( $data as $key => $item ) { + if ( $this->mergeExtensionItem( $codeSequence, $key, $allData[$key], $item ) ) { + $used = true; + } + } + + if ( $used ) { + $deps[] = new FileDependency( $fileName ); + } + } + + # Merge core data into extension data + foreach ( $coreData as $key => $item ) { + $this->mergeItem( $key, $allData[$key], $item ); + } + + # Add cache dependencies for any referenced globals + $deps['wgExtensionMessagesFiles'] = new GlobalDependency( 'wgExtensionMessagesFiles' ); + $deps['version'] = new ConstantDependency( 'MW_LC_VERSION' ); + + # Add dependencies to the cache entry + $allData['deps'] = $deps; + + # Replace spaces with underscores in namespace names + $allData['namespaceNames'] = str_replace( ' ', '_', $allData['namespaceNames'] ); + + # And do the same for special page aliases. $page is an array. + foreach ( $allData['specialPageAliases'] as &$page ) { + $page = str_replace( ' ', '_', $page ); + } + # Decouple the reference to prevent accidental damage + unset( $page ); + + # If there were no plural rules, return an empty array + if ( $allData['pluralRules'] === null ) { + $allData['pluralRules'] = array(); + } + if ( $allData['compiledPluralRules'] === null ) { + $allData['compiledPluralRules'] = array(); + } + + # Set the list keys + $allData['list'] = array(); + foreach ( self::$splitKeys as $key ) { + $allData['list'][$key] = array_keys( $allData[$key] ); + } + # Run hooks + wfRunHooks( 'LocalisationCacheRecache', array( $this, $code, &$allData ) ); + + if ( is_null( $allData['namespaceNames'] ) ) { + throw new MWException( __METHOD__ . ': Localisation data failed sanity check! ' . + 'Check that your languages/messages/MessagesEn.php file is intact.' ); + } + + # Set the preload key + $allData['preload'] = $this->buildPreload( $allData ); + + # Save to the process cache and register the items loaded + $this->data[$code] = $allData; + foreach ( $allData as $key => $item ) { + $this->loadedItems[$code][$key] = true; + } + + # Save to the persistent cache + $this->store->startWrite( $code ); + foreach ( $allData as $key => $value ) { + if ( in_array( $key, self::$splitKeys ) ) { + foreach ( $value as $subkey => $subvalue ) { + $this->store->set( "$key:$subkey", $subvalue ); + } + } else { + $this->store->set( $key, $value ); + } + } + $this->store->finishWrite(); + + # Clear out the MessageBlobStore + # HACK: If using a null (i.e. disabled) storage backend, we + # can't write to the MessageBlobStore either + if ( !$this->store instanceof LCStore_Null ) { + MessageBlobStore::clear(); + } + + wfProfileOut( __METHOD__ ); + } + + /** + * Build the preload item from the given pre-cache data. + * + * The preload item will be loaded automatically, improving performance + * for the commonly-requested items it contains. + * @param $data + * @return array + */ + protected function buildPreload( $data ) { + $preload = array( 'messages' => array() ); + foreach ( self::$preloadedKeys as $key ) { + $preload[$key] = $data[$key]; + } + + foreach ( $data['preloadedMessages'] as $subkey ) { + if ( isset( $data['messages'][$subkey] ) ) { + $subitem = $data['messages'][$subkey]; + } else { + $subitem = null; + } + $preload['messages'][$subkey] = $subitem; + } + + return $preload; + } + + /** + * Unload the data for a given language from the object cache. + * Reduces memory usage. + * @param $code + */ + public function unload( $code ) { + unset( $this->data[$code] ); + unset( $this->loadedItems[$code] ); + unset( $this->loadedSubitems[$code] ); + unset( $this->initialisedLangs[$code] ); + + foreach ( $this->shallowFallbacks as $shallowCode => $fbCode ) { + if ( $fbCode === $code ) { + $this->unload( $shallowCode ); + } + } + } + + /** + * Unload all data + */ + public function unloadAll() { + foreach ( $this->initialisedLangs as $lang => $unused ) { + $this->unload( $lang ); + } + } + + /** + * Disable the storage backend + */ + public function disableBackend() { + $this->store = new LCStore_Null; + $this->manualRecache = false; + } +} + +/** + * Interface for the persistence layer of LocalisationCache. + * + * The persistence layer is two-level hierarchical cache. The first level + * is the language, the second level is the item or subitem. + * + * Since the data for a whole language is rebuilt in one operation, it needs + * to have a fast and atomic method for deleting or replacing all of the + * current data for a given language. The interface reflects this bulk update + * operation. Callers writing to the cache must first call startWrite(), then + * will call set() a couple of thousand times, then will call finishWrite() + * to commit the operation. When finishWrite() is called, the cache is + * expected to delete all data previously stored for that language. + * + * The values stored are PHP variables suitable for serialize(). Implementations + * of LCStore are responsible for serializing and unserializing. + */ +interface LCStore { + /** + * Get a value. + * @param string $code Language code + * @param string $key Cache key + */ + function get( $code, $key ); + + /** + * Start a write transaction. + * @param $code Language code + */ + function startWrite( $code ); + + /** + * Finish a write transaction. + */ + function finishWrite(); + + /** + * Set a key to a given value. startWrite() must be called before this + * is called, and finishWrite() must be called afterwards. + * @param $key + * @param $value + */ + function set( $key, $value ); +} + +/** + * LCStore implementation which uses PHP accelerator to store data. + * This will work if one of XCache, WinCache or APC cacher is configured. + * (See ObjectCache.php) + */ +class LCStore_Accel implements LCStore { + var $currentLang; + var $keys; + + public function __construct() { + $this->cache = wfGetCache( CACHE_ACCEL ); + } + + public function get( $code, $key ) { + $k = wfMemcKey( 'l10n', $code, 'k', $key ); + $r = $this->cache->get( $k ); + return $r === false ? null : $r; + } + + public function startWrite( $code ) { + $k = wfMemcKey( 'l10n', $code, 'l' ); + $keys = $this->cache->get( $k ); + if ( $keys ) { + foreach ( $keys as $k ) { + $this->cache->delete( $k ); + } + } + $this->currentLang = $code; + $this->keys = array(); + } + + public function finishWrite() { + if ( $this->currentLang ) { + $k = wfMemcKey( 'l10n', $this->currentLang, 'l' ); + $this->cache->set( $k, array_keys( $this->keys ) ); + } + $this->currentLang = null; + $this->keys = array(); + } + + public function set( $key, $value ) { + if ( $this->currentLang ) { + $k = wfMemcKey( 'l10n', $this->currentLang, 'k', $key ); + $this->keys[$k] = true; + $this->cache->set( $k, $value ); + } + } +} + +/** + * LCStore implementation which uses the standard DB functions to store data. + * This will work on any MediaWiki installation. + */ +class LCStore_DB implements LCStore { + var $currentLang; + var $writesDone = false; + + /** + * @var DatabaseBase + */ + var $dbw; + var $batch; + var $readOnly = false; + + public function get( $code, $key ) { + if ( $this->writesDone ) { + $db = wfGetDB( DB_MASTER ); + } else { + $db = wfGetDB( DB_SLAVE ); + } + $row = $db->selectRow( 'l10n_cache', array( 'lc_value' ), + array( 'lc_lang' => $code, 'lc_key' => $key ), __METHOD__ ); + if ( $row ) { + return unserialize( $row->lc_value ); + } else { + return null; + } + } + + public function startWrite( $code ) { + if ( $this->readOnly ) { + return; + } + + if ( !$code ) { + throw new MWException( __METHOD__ . ": Invalid language \"$code\"" ); + } + + $this->dbw = wfGetDB( DB_MASTER ); + try { + $this->dbw->begin( __METHOD__ ); + $this->dbw->delete( 'l10n_cache', array( 'lc_lang' => $code ), __METHOD__ ); + } catch ( DBQueryError $e ) { + if ( $this->dbw->wasReadOnlyError() ) { + $this->readOnly = true; + $this->dbw->rollback( __METHOD__ ); + return; + } else { + throw $e; + } + } + + $this->currentLang = $code; + $this->batch = array(); + } + + public function finishWrite() { + if ( $this->readOnly ) { + return; + } + + if ( $this->batch ) { + $this->dbw->insert( 'l10n_cache', $this->batch, __METHOD__ ); + } + + $this->dbw->commit( __METHOD__ ); + $this->currentLang = null; + $this->dbw = null; + $this->batch = array(); + $this->writesDone = true; + } + + public function set( $key, $value ) { + if ( $this->readOnly ) { + return; + } + + if ( is_null( $this->currentLang ) ) { + throw new MWException( __CLASS__ . ': must call startWrite() before calling set()' ); + } + + $this->batch[] = array( + 'lc_lang' => $this->currentLang, + 'lc_key' => $key, + 'lc_value' => serialize( $value ) ); + + if ( count( $this->batch ) >= 100 ) { + $this->dbw->insert( 'l10n_cache', $this->batch, __METHOD__ ); + $this->batch = array(); + } + } +} + +/** + * LCStore implementation which stores data as a collection of CDB files in the + * directory given by $wgCacheDirectory. If $wgCacheDirectory is not set, this + * will throw an exception. + * + * Profiling indicates that on Linux, this implementation outperforms MySQL if + * the directory is on a local filesystem and there is ample kernel cache + * space. The performance advantage is greater when the DBA extension is + * available than it is with the PHP port. + * + * See Cdb.php and http://cr.yp.to/cdb.html + */ +class LCStore_CDB implements LCStore { + var $readers, $writer, $currentLang, $directory; + + function __construct( $conf = array() ) { + global $wgCacheDirectory; + + if ( isset( $conf['directory'] ) ) { + $this->directory = $conf['directory']; + } else { + $this->directory = $wgCacheDirectory; + } + } + + public function get( $code, $key ) { + if ( !isset( $this->readers[$code] ) ) { + $fileName = $this->getFileName( $code ); + + if ( !file_exists( $fileName ) ) { + $this->readers[$code] = false; + } else { + $this->readers[$code] = CdbReader::open( $fileName ); + } + } + + if ( !$this->readers[$code] ) { + return null; + } else { + $value = $this->readers[$code]->get( $key ); + + if ( $value === false ) { + return null; + } + return unserialize( $value ); + } + } + + public function startWrite( $code ) { + if ( !file_exists( $this->directory ) ) { + if ( !wfMkdirParents( $this->directory, null, __METHOD__ ) ) { + throw new MWException( "Unable to create the localisation store " . + "directory \"{$this->directory}\"" ); + } + } + + // Close reader to stop permission errors on write + if ( !empty( $this->readers[$code] ) ) { + $this->readers[$code]->close(); + } + + $this->writer = CdbWriter::open( $this->getFileName( $code ) ); + $this->currentLang = $code; + } + + public function finishWrite() { + // Close the writer + $this->writer->close(); + $this->writer = null; + unset( $this->readers[$this->currentLang] ); + $this->currentLang = null; + } + + public function set( $key, $value ) { + if ( is_null( $this->writer ) ) { + throw new MWException( __CLASS__ . ': must call startWrite() before calling set()' ); + } + $this->writer->set( $key, serialize( $value ) ); + } + + protected function getFileName( $code ) { + if ( strval( $code ) === '' || strpos( $code, '/' ) !== false ) { + throw new MWException( __METHOD__ . ": Invalid language \"$code\"" ); + } + return "{$this->directory}/l10n_cache-$code.cdb"; + } +} + +/** + * Null store backend, used to avoid DB errors during install + */ +class LCStore_Null implements LCStore { + public function get( $code, $key ) { + return null; + } + + public function startWrite( $code ) {} + public function finishWrite() {} + public function set( $key, $value ) {} +} + +/** + * A localisation cache optimised for loading large amounts of data for many + * languages. Used by rebuildLocalisationCache.php. + */ +class LocalisationCache_BulkLoad extends LocalisationCache { + /** + * A cache of the contents of data files. + * Core files are serialized to avoid using ~1GB of RAM during a recache. + */ + var $fileCache = array(); + + /** + * Most recently used languages. Uses the linked-list aspect of PHP hashtables + * to keep the most recently used language codes at the end of the array, and + * the language codes that are ready to be deleted at the beginning. + */ + var $mruLangs = array(); + + /** + * Maximum number of languages that may be loaded into $this->data + */ + var $maxLoadedLangs = 10; + + /** + * @param $fileName + * @param $fileType + * @return array|mixed + */ + protected function readPHPFile( $fileName, $fileType ) { + $serialize = $fileType === 'core'; + if ( !isset( $this->fileCache[$fileName][$fileType] ) ) { + $data = parent::readPHPFile( $fileName, $fileType ); + + if ( $serialize ) { + $encData = serialize( $data ); + } else { + $encData = $data; + } + + $this->fileCache[$fileName][$fileType] = $encData; + + return $data; + } elseif ( $serialize ) { + return unserialize( $this->fileCache[$fileName][$fileType] ); + } else { + return $this->fileCache[$fileName][$fileType]; + } + } + + /** + * @param $code + * @param $key + * @return mixed + */ + public function getItem( $code, $key ) { + unset( $this->mruLangs[$code] ); + $this->mruLangs[$code] = true; + return parent::getItem( $code, $key ); + } + + /** + * @param $code + * @param $key + * @param $subkey + * @return + */ + public function getSubitem( $code, $key, $subkey ) { + unset( $this->mruLangs[$code] ); + $this->mruLangs[$code] = true; + return parent::getSubitem( $code, $key, $subkey ); + } + + /** + * @param $code + */ + public function recache( $code ) { + parent::recache( $code ); + unset( $this->mruLangs[$code] ); + $this->mruLangs[$code] = true; + $this->trimCache(); + } + + /** + * @param $code + */ + public function unload( $code ) { + unset( $this->mruLangs[$code] ); + parent::unload( $code ); + } + + /** + * Unload cached languages until there are less than $this->maxLoadedLangs + */ + protected function trimCache() { + while ( count( $this->data ) > $this->maxLoadedLangs && count( $this->mruLangs ) ) { + reset( $this->mruLangs ); + $code = key( $this->mruLangs ); + wfDebug( __METHOD__ . ": unloading $code\n" ); + $this->unload( $code ); + } + } + +} |