includes/LocalisationCache.php

   1 <?php
   2
   3 define( 'MW_LC_VERSION', 2 );
   4
   5 /**
   6  * Class for caching the contents of localisation files, Messages*.php
   7  * and *.i18n.php.
   8  *
   9  * An instance of this class is available using Language::getLocalisationCache().
  10  *
  11  * The values retrieved from here are merged, containing items from extension
  12  * files, core messages files and the language fallback sequence (e.g. zh-cn ->
  13  * zh-hans -> en ). Some common errors are corrected, for example namespace
  14  * names with spaces instead of underscores, but heavyweight processing, such
  15  * as grammatical transformation, is done by the caller.
  16  */
  17 class LocalisationCache {
  18         /** Configuration associative array */
  19         var $conf;
  20
  21         /**
  22          * True if recaching should only be done on an explicit call to recache().
  23          * Setting this reduces the overhead of cache freshness checking, which
  24          * requires doing a stat() for every extension i18n file.
  25          */
  26         var $manualRecache = false;
  27
  28         /**
  29          * True to treat all files as expired until they are regenerated by this object.
  30          */
  31         var $forceRecache = false;
  32
  33         /**
  34          * The cache data. 3-d array, where the first key is the language code,
  35          * the second key is the item key e.g. 'messages', and the third key is
  36          * an item specific subkey index. Some items are not arrays and so for those
  37          * items, there are no subkeys.
  38          */
  39         var $data = array();
  40
  41         /**
  42          * The persistent store object. An instance of LCStore.
  43          *
  44          * @var LCStore
  45          */
  46         var $store;
  47
  48         /**
  49          * A 2-d associative array, code/key, where presence indicates that the item
  50          * is loaded. Value arbitrary.
  51          *
  52          * For split items, if set, this indicates that all of the subitems have been
  53          * loaded.
  54          */
  55         var $loadedItems = array();
  56
  57         /**
  58          * A 3-d associative array, code/key/subkey, where presence indicates that
  59          * the subitem is loaded. Only used for the split items, i.e. messages.
  60          */
  61         var $loadedSubitems = array();
  62
  63         /**
  64          * An array where presence of a key indicates that that language has been
  65          * initialised. Initialisation includes checking for cache expiry and doing
  66          * any necessary updates.
  67          */
  68         var $initialisedLangs = array();
  69
  70         /**
  71          * An array mapping non-existent pseudo-languages to fallback languages. This
  72          * is filled by initShallowFallback() when data is requested from a language
  73          * that lacks a Messages*.php file.
  74          */
  75         var $shallowFallbacks = array();
  76
  77         /**
  78          * An array where the keys are codes that have been recached by this instance.
  79          */
  80         var $recachedLangs = array();
  81
  82         /**
  83          * All item keys
  84          */
  85         static public $allKeys = array(
  86                 'fallback', 'namespaceNames', 'bookstoreList',
  87                 'magicWords', 'messages', 'rtl', 'capitalizeAllNouns', 'digitTransformTable',
  88                 'separatorTransformTable', 'fallback8bitEncoding', 'linkPrefixExtension',
  89                 'linkTrail', 'namespaceAliases',
  90                 'dateFormats', 'datePreferences', 'datePreferenceMigrationMap',
  91                 'defaultDateFormat', 'extraUserToggles', 'specialPageAliases',
  92                 'imageFiles', 'preloadedMessages', 'namespaceGenderAliases',
  93                 'digitGroupingPattern'
  94         );
  95
  96         /**
  97          * Keys for items which consist of associative arrays, which may be merged
  98          * by a fallback sequence.
  99          */
 100         static public $mergeableMapKeys = array( 'messages', 'namespaceNames',
 101                 'dateFormats', 'imageFiles', 'preloadedMessages',
 102         );
 103
 104         /**
 105          * Keys for items which are a numbered array.
 106          */
 107         static public $mergeableListKeys = array( 'extraUserToggles' );
 108
 109         /**
 110          * Keys for items which contain an array of arrays of equivalent aliases
 111          * for each subitem. The aliases may be merged by a fallback sequence.
 112          */
 113         static public $mergeableAliasListKeys = array( 'specialPageAliases' );
 114
 115         /**
 116          * Keys for items which contain an associative array, and may be merged if
 117          * the primary value contains the special array key "inherit". That array
 118          * key is removed after the first merge.
 119          */
 120         static public $optionalMergeKeys = array( 'bookstoreList' );
 121
 122         /**
 123          * Keys for items that are formatted like $magicWords
 124          */
 125         static public $magicWordKeys = array( 'magicWords' );
 126
 127         /**
 128          * Keys for items where the subitems are stored in the backend separately.
 129          */
 130         static public $splitKeys = array( 'messages' );
 131
 132         /**
 133          * Keys which are loaded automatically by initLanguage()
 134          */
 135         static public $preloadedKeys = array( 'dateFormats', 'namespaceNames' );
 136
 137         var $mergeableKeys = null;
 138
 139         /**
 140          * Constructor.
 141          * For constructor parameters, see the documentation in DefaultSettings.php
 142          * for $wgLocalisationCacheConf.
 143          *
 144          * @param $conf Array
 145          */
 146         function __construct( $conf ) {
 147                 global $wgCacheDirectory;
 148
 149                 $this->conf = $conf;
 150                 $storeConf = array();
 151                 if ( !empty( $conf['storeClass'] ) ) {
 152                         $storeClass = $conf['storeClass'];
 153                 } else {
 154                         switch ( $conf['store'] ) {
 155                                 case 'files':
 156                                 case 'file':
 157                                         $storeClass = 'LCStore_CDB';
 158                                         break;
 159                                 case 'db':
 160                                         $storeClass = 'LCStore_DB';
 161                                         break;
 162                                 case 'accel':
 163                                         $storeClass = 'LCStore_Accel';
 164                                         break;
 165                                 case 'detect':
 166                                         $storeClass = $wgCacheDirectory ? 'LCStore_CDB' : 'LCStore_DB';
 167                                         break;
 168                                 default:
 169                                         throw new MWException(
 170                                                 'Please set $wgLocalisationCacheConf[\'store\'] to something sensible.' );
 171                         }
 172                 }
 173
 174                 wfDebug( get_class( $this ) . ": using store $storeClass\n" );
 175                 if ( !empty( $conf['storeDirectory'] ) ) {
 176                         $storeConf['directory'] = $conf['storeDirectory'];
 177                 }
 178
 179                 $this->store = new $storeClass( $storeConf );
 180                 foreach ( array( 'manualRecache', 'forceRecache' ) as $var ) {
 181                         if ( isset( $conf[$var] ) ) {
 182                                 $this->$var = $conf[$var];
 183                         }
 184                 }
 185         }
 186
 187         /**
 188          * Returns true if the given key is mergeable, that is, if it is an associative
 189          * array which can be merged through a fallback sequence.
 190          * @param $key
 191          * @return bool
 192          */
 193         public function isMergeableKey( $key ) {
 194                 if ( $this->mergeableKeys === null ) {
 195                         $this->mergeableKeys = array_flip( array_merge(
 196                                 self::$mergeableMapKeys,
 197                                 self::$mergeableListKeys,
 198                                 self::$mergeableAliasListKeys,
 199                                 self::$optionalMergeKeys,
 200                                 self::$magicWordKeys
 201                         ) );
 202                 }
 203                 return isset( $this->mergeableKeys[$key] );
 204         }
 205
 206         /**
 207          * Get a cache item.
 208          *
 209          * Warning: this may be slow for split items (messages), since it will
 210          * need to fetch all of the subitems from the cache individually.
 211          * @param $code
 212          * @param $key
 213          * @return mixed
 214          */
 215         public function getItem( $code, $key ) {
 216                 if ( !isset( $this->loadedItems[$code][$key] ) ) {
 217                         wfProfileIn( __METHOD__.'-load' );
 218                         $this->loadItem( $code, $key );
 219                         wfProfileOut( __METHOD__.'-load' );
 220                 }
 221
 222                 if ( $key === 'fallback' && isset( $this->shallowFallbacks[$code] ) ) {
 223                         return $this->shallowFallbacks[$code];
 224                 }
 225
 226                 return $this->data[$code][$key];
 227         }
 228
 229         /**
 230          * Get a subitem, for instance a single message for a given language.
 231          * @param $code
 232          * @param $key
 233          * @param $subkey
 234          * @return null
 235          */
 236         public function getSubitem( $code, $key, $subkey ) {
 237                 if ( !isset( $this->loadedSubitems[$code][$key][$subkey] ) &&
 238                          !isset( $this->loadedItems[$code][$key] ) ) {
 239                         wfProfileIn( __METHOD__.'-load' );
 240                         $this->loadSubitem( $code, $key, $subkey );
 241                         wfProfileOut( __METHOD__.'-load' );
 242                 }
 243
 244                 if ( isset( $this->data[$code][$key][$subkey] ) ) {
 245                         return $this->data[$code][$key][$subkey];
 246                 } else {
 247                         return null;
 248                 }
 249         }
 250
 251         /**
 252          * Get the list of subitem keys for a given item.
 253          *
 254          * This is faster than array_keys($lc->getItem(...)) for the items listed in
 255          * self::$splitKeys.
 256          *
 257          * Will return null if the item is not found, or false if the item is not an
 258          * array.
 259          * @param $code
 260          * @param $key
 261          * @return bool|null|string
 262          */
 263         public function getSubitemList( $code, $key ) {
 264                 if ( in_array( $key, self::$splitKeys ) ) {
 265                         return $this->getSubitem( $code, 'list', $key );
 266                 } else {
 267                         $item = $this->getItem( $code, $key );
 268                         if ( is_array( $item ) ) {
 269                                 return array_keys( $item );
 270                         } else {
 271                                 return false;
 272                         }
 273                 }
 274         }
 275
 276         /**
 277          * Load an item into the cache.
 278          * @param $code
 279          * @param $key
 280          */
 281         protected function loadItem( $code, $key ) {
 282                 if ( !isset( $this->initialisedLangs[$code] ) ) {
 283                         $this->initLanguage( $code );
 284                 }
 285
 286                 // Check to see if initLanguage() loaded it for us
 287                 if ( isset( $this->loadedItems[$code][$key] ) ) {
 288                         return;
 289                 }
 290
 291                 if ( isset( $this->shallowFallbacks[$code] ) ) {
 292                         $this->loadItem( $this->shallowFallbacks[$code], $key );
 293                         return;
 294                 }
 295
 296                 if ( in_array( $key, self::$splitKeys ) ) {
 297                         $subkeyList = $this->getSubitem( $code, 'list', $key );
 298                         foreach ( $subkeyList as $subkey ) {
 299                                 if ( isset( $this->data[$code][$key][$subkey] ) ) {
 300                                         continue;
 301                                 }
 302                                 $this->data[$code][$key][$subkey] = $this->getSubitem( $code, $key, $subkey );
 303                         }
 304                 } else {
 305                         $this->data[$code][$key] = $this->store->get( $code, $key );
 306                 }
 307
 308                 $this->loadedItems[$code][$key] = true;
 309         }
 310
 311         /**
 312          * Load a subitem into the cache
 313          * @param $code
 314          * @param $key
 315          * @param $subkey
 316          * @return
 317          */
 318         protected function loadSubitem( $code, $key, $subkey ) {
 319                 if ( !in_array( $key, self::$splitKeys ) ) {
 320                         $this->loadItem( $code, $key );
 321                         return;
 322                 }
 323
 324                 if ( !isset( $this->initialisedLangs[$code] ) ) {
 325                         $this->initLanguage( $code );
 326                 }
 327
 328                 // Check to see if initLanguage() loaded it for us
 329                 if ( isset( $this->loadedItems[$code][$key] ) ||
 330                          isset( $this->loadedSubitems[$code][$key][$subkey] ) ) {
 331                         return;
 332                 }
 333
 334                 if ( isset( $this->shallowFallbacks[$code] ) ) {
 335                         $this->loadSubitem( $this->shallowFallbacks[$code], $key, $subkey );
 336                         return;
 337                 }
 338
 339                 $value = $this->store->get( $code, "$key:$subkey" );
 340                 $this->data[$code][$key][$subkey] = $value;
 341                 $this->loadedSubitems[$code][$key][$subkey] = true;
 342         }
 343
 344         /**
 345          * Returns true if the cache identified by $code is missing or expired.
 346          */
 347         public function isExpired( $code ) {
 348                 if ( $this->forceRecache && !isset( $this->recachedLangs[$code] ) ) {
 349                         wfDebug( __METHOD__."($code): forced reload\n" );
 350                         return true;
 351                 }
 352
 353                 $deps = $this->store->get( $code, 'deps' );
 354                 $keys = $this->store->get( $code, 'list', 'messages' );
 355                 $preload = $this->store->get( $code, 'preload' );
 356                 // Different keys may expire separately, at least in LCStore_Accel
 357                 if ( $deps === null || $keys === null || $preload === null ) {
 358                         wfDebug( __METHOD__."($code): cache missing, need to make one\n" );
 359                         return true;
 360                 }
 361
 362                 foreach ( $deps as $dep ) {
 363                         // Because we're unserializing stuff from cache, we
 364                         // could receive objects of classes that don't exist
 365                         // anymore (e.g. uninstalled extensions)
 366                         // When this happens, always expire the cache
 367                         if ( !$dep instanceof CacheDependency || $dep->isExpired() ) {
 368                                 wfDebug( __METHOD__."($code): cache for $code expired due to " .
 369                                         get_class( $dep ) . "\n" );
 370                                 return true;
 371                         }
 372                 }
 373
 374                 return false;
 375         }
 376
 377         /**
 378          * Initialise a language in this object. Rebuild the cache if necessary.
 379          * @param $code
 380          */
 381         protected function initLanguage( $code ) {
 382                 if ( isset( $this->initialisedLangs[$code] ) ) {
 383                         return;
 384                 }
 385
 386                 $this->initialisedLangs[$code] = true;
 387
 388                 # If the code is of the wrong form for a Messages*.php file, do a shallow fallback
 389                 if ( !Language::isValidBuiltInCode( $code ) ) {
 390                         $this->initShallowFallback( $code, 'en' );
 391                         return;
 392                 }
 393
 394                 # Recache the data if necessary
 395                 if ( !$this->manualRecache && $this->isExpired( $code ) ) {
 396                         if ( file_exists( Language::getMessagesFileName( $code ) ) ) {
 397                                 $this->recache( $code );
 398                         } elseif ( $code === 'en' ) {
 399                                 throw new MWException( 'MessagesEn.php is missing.' );
 400                         } else {
 401                                 $this->initShallowFallback( $code, 'en' );
 402                         }
 403                         return;
 404                 }
 405
 406                 # Preload some stuff
 407                 $preload = $this->getItem( $code, 'preload' );
 408                 if ( $preload === null ) {
 409                         if ( $this->manualRecache ) {
 410                                 // No Messages*.php file. Do shallow fallback to en.
 411                                 if ( $code === 'en' ) {
 412                                         throw new MWException( 'No localisation cache found for English. ' .
 413                                                 'Please run maintenance/rebuildLocalisationCache.php.' );
 414                                 }
 415                                 $this->initShallowFallback( $code, 'en' );
 416                                 return;
 417                         } else {
 418                                 throw new MWException( 'Invalid or missing localisation cache.' );
 419                         }
 420                 }
 421                 $this->data[$code] = $preload;
 422                 foreach ( $preload as $key => $item ) {
 423                         if ( in_array( $key, self::$splitKeys ) ) {
 424                                 foreach ( $item as $subkey => $subitem ) {
 425                                         $this->loadedSubitems[$code][$key][$subkey] = true;
 426                                 }
 427                         } else {
 428                                 $this->loadedItems[$code][$key] = true;
 429                         }
 430                 }
 431         }
 432
 433         /**
 434          * Create a fallback from one language to another, without creating a
 435          * complete persistent cache.
 436          * @param $primaryCode
 437          * @param $fallbackCode
 438          */
 439         public function initShallowFallback( $primaryCode, $fallbackCode ) {
 440                 $this->data[$primaryCode] =& $this->data[$fallbackCode];
 441                 $this->loadedItems[$primaryCode] =& $this->loadedItems[$fallbackCode];
 442                 $this->loadedSubitems[$primaryCode] =& $this->loadedSubitems[$fallbackCode];
 443                 $this->shallowFallbacks[$primaryCode] = $fallbackCode;
 444         }
 445
 446         /**
 447          * Read a PHP file containing localisation data.
 448          * @param $_fileName
 449          * @param $_fileType
 450          * @return array
 451          */
 452         protected function readPHPFile( $_fileName, $_fileType ) {
 453                 // Disable APC caching
 454                 $_apcEnabled = ini_set( 'apc.cache_by_default', '0' );
 455                 include( $_fileName );
 456                 ini_set( 'apc.cache_by_default', $_apcEnabled );
 457
 458                 if ( $_fileType == 'core' || $_fileType == 'extension' ) {
 459                         $data = compact( self::$allKeys );
 460                 } elseif ( $_fileType == 'aliases' ) {
 461                         $data = compact( 'aliases' );
 462                 } else {
 463                         throw new MWException( __METHOD__.": Invalid file type: $_fileType" );
 464                 }
 465
 466                 return $data;
 467         }
 468
 469         /**
 470          * Merge two localisation values, a primary and a fallback, overwriting the
 471          * primary value in place.
 472          * @param $key
 473          * @param $value
 474          * @param $fallbackValue
 475          */
 476         protected function mergeItem( $key, &$value, $fallbackValue ) {
 477                 if ( !is_null( $value ) ) {
 478                         if ( !is_null( $fallbackValue ) ) {
 479                                 if ( in_array( $key, self::$mergeableMapKeys ) ) {
 480                                         $value = $value + $fallbackValue;
 481                                 } elseif ( in_array( $key, self::$mergeableListKeys ) ) {
 482                                         $value = array_unique( array_merge( $fallbackValue, $value ) );
 483                                 } elseif ( in_array( $key, self::$mergeableAliasListKeys ) ) {
 484                                         $value = array_merge_recursive( $value, $fallbackValue );
 485                                 } elseif ( in_array( $key, self::$optionalMergeKeys ) ) {
 486                                         if ( !empty( $value['inherit'] ) )  {
 487                                                 $value = array_merge( $fallbackValue, $value );
 488                                         }
 489
 490                                         if ( isset( $value['inherit'] ) ) {
 491                                                 unset( $value['inherit'] );
 492                                         }
 493                                 } elseif ( in_array( $key, self::$magicWordKeys ) ) {
 494                                         $this->mergeMagicWords( $value, $fallbackValue );
 495                                 }
 496                         }
 497                 } else {
 498                         $value = $fallbackValue;
 499                 }
 500         }
 501
 502         /**
 503          * @param $value
 504          * @param $fallbackValue
 505          */
 506         protected function mergeMagicWords( &$value, $fallbackValue ) {
 507                 foreach ( $fallbackValue as $magicName => $fallbackInfo ) {
 508                         if ( !isset( $value[$magicName] ) ) {
 509                                 $value[$magicName] = $fallbackInfo;
 510                         } else {
 511                                 $oldSynonyms = array_slice( $fallbackInfo, 1 );
 512                                 $newSynonyms = array_slice( $value[$magicName], 1 );
 513                                 $synonyms = array_values( array_unique( array_merge(
 514                                         $newSynonyms, $oldSynonyms ) ) );
 515                                 $value[$magicName] = array_merge( array( $fallbackInfo[0] ), $synonyms );
 516                         }
 517                 }
 518         }
 519
 520         /**
 521          * Given an array mapping language code to localisation value, such as is
 522          * found in extension *.i18n.php files, iterate through a fallback sequence
 523          * to merge the given data with an existing primary value.
 524          *
 525          * Returns true if any data from the extension array was used, false
 526          * otherwise.
 527          * @param $codeSequence
 528          * @param $key
 529          * @param $value
 530          * @param $fallbackValue
 531          * @return bool
 532          */
 533         protected function mergeExtensionItem( $codeSequence, $key, &$value, $fallbackValue ) {
 534                 $used = false;
 535                 foreach ( $codeSequence as $code ) {
 536                         if ( isset( $fallbackValue[$code] ) ) {
 537                                 $this->mergeItem( $key, $value, $fallbackValue[$code] );
 538                                 $used = true;
 539                         }
 540                 }
 541
 542                 return $used;
 543         }
 544
 545         /**
 546          * Load localisation data for a given language for both core and extensions
 547          * and save it to the persistent cache store and the process cache
 548          * @param $code
 549          */
 550         public function recache( $code ) {
 551                 global $wgExtensionMessagesFiles;
 552                 wfProfileIn( __METHOD__ );
 553
 554                 if ( !$code ) {
 555                         throw new MWException( "Invalid language code requested" );
 556                 }
 557                 $this->recachedLangs[$code] = true;
 558
 559                 # Initial values
 560                 $initialData = array_combine(
 561                         self::$allKeys,
 562                         array_fill( 0, count( self::$allKeys ), null ) );
 563                 $coreData = $initialData;
 564                 $deps = array();
 565
 566                 # Load the primary localisation from the source file
 567                 $fileName = Language::getMessagesFileName( $code );
 568                 if ( !file_exists( $fileName ) ) {
 569                         wfDebug( __METHOD__.": no localisation file for $code, using fallback to en\n" );
 570                         $coreData['fallback'] = 'en';
 571                 } else {
 572                         $deps[] = new FileDependency( $fileName );
 573                         $data = $this->readPHPFile( $fileName, 'core' );
 574                         wfDebug( __METHOD__.": got localisation for $code from source\n" );
 575
 576                         # Merge primary localisation
 577                         foreach ( $data as $key => $value ) {
 578                                 $this->mergeItem( $key, $coreData[$key], $value );
 579                         }
 580
 581                 }
 582
 583                 # Fill in the fallback if it's not there already
 584                 if ( is_null( $coreData['fallback'] ) ) {
 585                         $coreData['fallback'] = $code === 'en' ? false : 'en';
 586                 }
 587
 588                 if ( $coreData['fallback'] === false ) {
 589                         $coreData['fallbackSequence'] = array();
 590                 } else {
 591                         $coreData['fallbackSequence'] = array_map( 'trim', explode( ',', $coreData['fallback'] ) );
 592                         $len = count( $coreData['fallbackSequence'] );
 593
 594                         # Ensure that the sequence ends at en
 595                         if ( $coreData['fallbackSequence'][$len - 1] !== 'en' ) {
 596                                 $coreData['fallbackSequence'][] = 'en';
 597                         }
 598
 599                         # Load the fallback localisation item by item and merge it
 600                         foreach ( $coreData['fallbackSequence'] as $fbCode ) {
 601                                 # Load the secondary localisation from the source file to
 602                                 # avoid infinite cycles on cyclic fallbacks
 603                                 $fbFilename = Language::getMessagesFileName( $fbCode );
 604
 605                                 if ( !file_exists( $fbFilename ) ) {
 606                                         continue;
 607                                 }
 608
 609                                 $deps[] = new FileDependency( $fbFilename );
 610                                 $fbData = $this->readPHPFile( $fbFilename, 'core' );
 611
 612                                 foreach ( self::$allKeys as $key ) {
 613                                         if ( !isset( $fbData[$key] ) ) {
 614                                                 continue;
 615                                         }
 616
 617                                         if ( is_null( $coreData[$key] ) || $this->isMergeableKey( $key ) ) {
 618                                                 $this->mergeItem( $key, $coreData[$key], $fbData[$key] );
 619                                         }
 620                                 }
 621                         }
 622                 }
 623
 624                 $codeSequence = array_merge( array( $code ), $coreData['fallbackSequence'] );
 625
 626                 # Load the extension localisations
 627                 # This is done after the core because we know the fallback sequence now.
 628                 # But it has a higher precedence for merging so that we can support things
 629                 # like site-specific message overrides.
 630                 $allData = $initialData;
 631                 foreach ( $wgExtensionMessagesFiles as $fileName ) {
 632                         $data = $this->readPHPFile( $fileName, 'extension' );
 633                         $used = false;
 634
 635                         foreach ( $data as $key => $item ) {
 636                                 if( $this->mergeExtensionItem( $codeSequence, $key, $allData[$key], $item ) ) {
 637                                         $used = true;
 638                                 }
 639                         }
 640
 641                         if ( $used ) {
 642                                 $deps[] = new FileDependency( $fileName );
 643                         }
 644                 }
 645
 646                 # Merge core data into extension data
 647                 foreach ( $coreData as $key => $item ) {
 648                         $this->mergeItem( $key, $allData[$key], $item );
 649                 }
 650
 651                 # Add cache dependencies for any referenced globals
 652                 $deps['wgExtensionMessagesFiles'] = new GlobalDependency( 'wgExtensionMessagesFiles' );
 653                 $deps['version'] = new ConstantDependency( 'MW_LC_VERSION' );
 654
 655                 # Add dependencies to the cache entry
 656                 $allData['deps'] = $deps;
 657
 658                 # Replace spaces with underscores in namespace names
 659                 $allData['namespaceNames'] = str_replace( ' ', '_', $allData['namespaceNames'] );
 660
 661                 # And do the same for special page aliases. $page is an array.
 662                 foreach ( $allData['specialPageAliases'] as &$page ) {
 663                         $page = str_replace( ' ', '_', $page );
 664                 }
 665                 # Decouple the reference to prevent accidental damage
 666                 unset($page);
 667
 668                 # Set the list keys
 669                 $allData['list'] = array();
 670                 foreach ( self::$splitKeys as $key ) {
 671                         $allData['list'][$key] = array_keys( $allData[$key] );
 672                 }
 673
 674                 # Run hooks
 675                 wfRunHooks( 'LocalisationCacheRecache', array( $this, $code, &$allData ) );
 676
 677                 if ( is_null( $allData['namespaceNames'] ) ) {
 678                         throw new MWException( __METHOD__.': Localisation data failed sanity check! ' .
 679                                 'Check that your languages/messages/MessagesEn.php file is intact.' );
 680                 }
 681
 682                 # Set the preload key
 683                 $allData['preload'] = $this->buildPreload( $allData );
 684
 685                 # Save to the process cache and register the items loaded
 686                 $this->data[$code] = $allData;
 687                 foreach ( $allData as $key => $item ) {
 688                         $this->loadedItems[$code][$key] = true;
 689                 }
 690
 691                 # Save to the persistent cache
 692                 $this->store->startWrite( $code );
 693                 foreach ( $allData as $key => $value ) {
 694                         if ( in_array( $key, self::$splitKeys ) ) {
 695                                 foreach ( $value as $subkey => $subvalue ) {
 696                                         $this->store->set( "$key:$subkey", $subvalue );
 697                                 }
 698                         } else {
 699                                 $this->store->set( $key, $value );
 700                         }
 701                 }
 702                 $this->store->finishWrite();
 703
 704                 # Clear out the MessageBlobStore
 705                 # HACK: If using a null (i.e. disabled) storage backend, we
 706                 # can't write to the MessageBlobStore either
 707                 if ( !$this->store instanceof LCStore_Null ) {
 708                         MessageBlobStore::clear();
 709                 }
 710
 711                 wfProfileOut( __METHOD__ );
 712         }
 713
 714         /**
 715          * Build the preload item from the given pre-cache data.
 716          *
 717          * The preload item will be loaded automatically, improving performance
 718          * for the commonly-requested items it contains.
 719          * @param $data
 720          * @return array
 721          */
 722         protected function buildPreload( $data ) {
 723                 $preload = array( 'messages' => array() );
 724                 foreach ( self::$preloadedKeys as $key ) {
 725                         $preload[$key] = $data[$key];
 726                 }
 727
 728                 foreach ( $data['preloadedMessages'] as $subkey ) {
 729                         if ( isset( $data['messages'][$subkey] ) ) {
 730                                 $subitem = $data['messages'][$subkey];
 731                         } else {
 732                                 $subitem = null;
 733                         }
 734                         $preload['messages'][$subkey] = $subitem;
 735                 }
 736
 737                 return $preload;
 738         }
 739
 740         /**
 741          * Unload the data for a given language from the object cache.
 742          * Reduces memory usage.
 743          * @param $code
 744          */
 745         public function unload( $code ) {
 746                 unset( $this->data[$code] );
 747                 unset( $this->loadedItems[$code] );
 748                 unset( $this->loadedSubitems[$code] );
 749                 unset( $this->initialisedLangs[$code] );
 750
 751                 foreach ( $this->shallowFallbacks as $shallowCode => $fbCode ) {
 752                         if ( $fbCode === $code ) {
 753                                 $this->unload( $shallowCode );
 754                         }
 755                 }
 756         }
 757
 758         /**
 759          * Unload all data
 760          */
 761         public function unloadAll() {
 762                 foreach ( $this->initialisedLangs as $lang => $unused ) {
 763                         $this->unload( $lang );
 764                 }
 765         }
 766
 767         /**
 768          * Disable the storage backend
 769          */
 770         public function disableBackend() {
 771                 $this->store = new LCStore_Null;
 772                 $this->manualRecache = false;
 773         }
 774 }
 775
 776 /**
 777  * Interface for the persistence layer of LocalisationCache.
 778  *
 779  * The persistence layer is two-level hierarchical cache. The first level
 780  * is the language, the second level is the item or subitem.
 781  *
 782  * Since the data for a whole language is rebuilt in one operation, it needs
 783  * to have a fast and atomic method for deleting or replacing all of the
 784  * current data for a given language. The interface reflects this bulk update
 785  * operation. Callers writing to the cache must first call startWrite(), then
 786  * will call set() a couple of thousand times, then will call finishWrite()
 787  * to commit the operation. When finishWrite() is called, the cache is
 788  * expected to delete all data previously stored for that language.
 789  *
 790  * The values stored are PHP variables suitable for serialize(). Implementations
 791  * of LCStore are responsible for serializing and unserializing.
 792  */
 793 interface LCStore {
 794         /**
 795          * Get a value.
 796          * @param $code Language code
 797          * @param $key Cache key
 798          */
 799         function get( $code, $key );
 800
 801         /**
 802          * Start a write transaction.
 803          * @param $code Language code
 804          */
 805         function startWrite( $code );
 806
 807         /**
 808          * Finish a write transaction.
 809          */
 810         function finishWrite();
 811
 812         /**
 813          * Set a key to a given value. startWrite() must be called before this
 814          * is called, and finishWrite() must be called afterwards.
 815          * @param $key
 816          * @param $value
 817          */
 818         function set( $key, $value );
 819 }
 820
 821 /**
 822  * LCStore implementation which uses PHP accelerator to store data.
 823  * This will work if one of XCache, WinCache or APC cacher is configured.
 824  * (See ObjectCache.php)
 825  */
 826 class LCStore_Accel implements LCStore {
 827         var $currentLang;
 828         var $keys;
 829
 830         public function __construct() {
 831                 $this->cache = wfGetCache( CACHE_ACCEL );
 832         }
 833
 834         public function get( $code, $key ) {
 835                 $k = wfMemcKey( 'l10n', $code, 'k', $key );
 836                 $r = $this->cache->get( $k );
 837                 return $r === false ? null : $r;
 838         }
 839
 840         public function startWrite( $code ) {
 841                 $k = wfMemcKey( 'l10n', $code, 'l' );
 842                 $keys = $this->cache->get( $k );
 843                 if ( $keys ) {
 844                         foreach ( $keys as $k ) {
 845                                 $this->cache->delete( $k );
 846                         }
 847                 }
 848                 $this->currentLang = $code;
 849                 $this->keys = array();
 850         }
 851
 852         public function finishWrite() {
 853                 if ( $this->currentLang ) {
 854                         $k = wfMemcKey( 'l10n', $this->currentLang, 'l' );
 855                         $this->cache->set( $k, array_keys( $this->keys ) );
 856                 }
 857                 $this->currentLang = null;
 858                 $this->keys = array();
 859         }
 860
 861         public function set( $key, $value ) {
 862                 if ( $this->currentLang ) {
 863                         $k = wfMemcKey( 'l10n', $this->currentLang, 'k', $key );
 864                         $this->keys[$k] = true;
 865                         $this->cache->set( $k, $value );
 866                 }
 867         }
 868 }
 869
 870 /**
 871  * LCStore implementation which uses the standard DB functions to store data.
 872  * This will work on any MediaWiki installation.
 873  */
 874 class LCStore_DB implements LCStore {
 875         var $currentLang;
 876         var $writesDone = false;
 877
 878         /**
 879          * @var DatabaseBase
 880          */
 881         var $dbw;
 882         var $batch;
 883         var $readOnly = false;
 884
 885         public function get( $code, $key ) {
 886                 if ( $this->writesDone ) {
 887                         $db = wfGetDB( DB_MASTER );
 888                 } else {
 889                         $db = wfGetDB( DB_SLAVE );
 890                 }
 891                 $row = $db->selectRow( 'l10n_cache', array( 'lc_value' ),
 892                         array( 'lc_lang' => $code, 'lc_key' => $key ), __METHOD__ );
 893                 if ( $row ) {
 894                         return unserialize( $row->lc_value );
 895                 } else {
 896                         return null;
 897                 }
 898         }
 899
 900         public function startWrite( $code ) {
 901                 if ( $this->readOnly ) {
 902                         return;
 903                 }
 904
 905                 if ( !$code ) {
 906                         throw new MWException( __METHOD__.": Invalid language \"$code\"" );
 907                 }
 908
 909                 $this->dbw = wfGetDB( DB_MASTER );
 910                 try {
 911                         $this->dbw->begin();
 912                         $this->dbw->delete( 'l10n_cache', array( 'lc_lang' => $code ), __METHOD__ );
 913                 } catch ( DBQueryError $e ) {
 914                         if ( $this->dbw->wasReadOnlyError() ) {
 915                                 $this->readOnly = true;
 916                                 $this->dbw->rollback();
 917                                 $this->dbw->ignoreErrors( false );
 918                                 return;
 919                         } else {
 920                                 throw $e;
 921                         }
 922                 }
 923
 924                 $this->currentLang = $code;
 925                 $this->batch = array();
 926         }
 927
 928         public function finishWrite() {
 929                 if ( $this->readOnly ) {
 930                         return;
 931                 }
 932
 933                 if ( $this->batch ) {
 934                         $this->dbw->insert( 'l10n_cache', $this->batch, __METHOD__ );
 935                 }
 936
 937                 $this->dbw->commit();
 938                 $this->currentLang = null;
 939                 $this->dbw = null;
 940                 $this->batch = array();
 941                 $this->writesDone = true;
 942         }
 943
 944         public function set( $key, $value ) {
 945                 if ( $this->readOnly ) {
 946                         return;
 947                 }
 948
 949                 if ( is_null( $this->currentLang ) ) {
 950                         throw new MWException( __CLASS__.': must call startWrite() before calling set()' );
 951                 }
 952
 953                 $this->batch[] = array(
 954                         'lc_lang' => $this->currentLang,
 955                         'lc_key' => $key,
 956                         'lc_value' => serialize( $value ) );
 957
 958                 if ( count( $this->batch ) >= 100 ) {
 959                         $this->dbw->insert( 'l10n_cache', $this->batch, __METHOD__ );
 960                         $this->batch = array();
 961                 }
 962         }
 963 }
 964
 965 /**
 966  * LCStore implementation which stores data as a collection of CDB files in the
 967  * directory given by $wgCacheDirectory. If $wgCacheDirectory is not set, this
 968  * will throw an exception.
 969  *
 970  * Profiling indicates that on Linux, this implementation outperforms MySQL if
 971  * the directory is on a local filesystem and there is ample kernel cache
 972  * space. The performance advantage is greater when the DBA extension is
 973  * available than it is with the PHP port.
 974  *
 975  * See Cdb.php and http://cr.yp.to/cdb.html
 976  */
 977 class LCStore_CDB implements LCStore {
 978         var $readers, $writer, $currentLang, $directory;
 979
 980         function __construct( $conf = array() ) {
 981                 global $wgCacheDirectory;
 982
 983                 if ( isset( $conf['directory'] ) ) {
 984                         $this->directory = $conf['directory'];
 985                 } else {
 986                         $this->directory = $wgCacheDirectory;
 987                 }
 988         }
 989
 990         public function get( $code, $key ) {
 991                 if ( !isset( $this->readers[$code] ) ) {
 992                         $fileName = $this->getFileName( $code );
 993
 994                         if ( !file_exists( $fileName ) ) {
 995                                 $this->readers[$code] = false;
 996                         } else {
 997                                 $this->readers[$code] = CdbReader::open( $fileName );
 998                         }
 999                 }
1000
1001                 if ( !$this->readers[$code] ) {
1002                         return null;
1003                 } else {
1004                         $value = $this->readers[$code]->get( $key );
1005
1006                         if ( $value === false ) {
1007                                 return null;
1008                         }
1009                         return unserialize( $value );
1010                 }
1011         }
1012
1013         public function startWrite( $code ) {
1014                 if ( !file_exists( $this->directory ) ) {
1015                         if ( !wfMkdirParents( $this->directory, null, __METHOD__ ) ) {
1016                                 throw new MWException( "Unable to create the localisation store " .
1017                                         "directory \"{$this->directory}\"" );
1018                         }
1019                 }
1020
1021                 // Close reader to stop permission errors on write
1022                 if( !empty($this->readers[$code]) ) {
1023                         $this->readers[$code]->close();
1024                 }
1025
1026                 $this->writer = CdbWriter::open( $this->getFileName( $code ) );
1027                 $this->currentLang = $code;
1028         }
1029
1030         public function finishWrite() {
1031                 // Close the writer
1032                 $this->writer->close();
1033                 $this->writer = null;
1034                 unset( $this->readers[$this->currentLang] );
1035                 $this->currentLang = null;
1036         }
1037
1038         public function set( $key, $value ) {
1039                 if ( is_null( $this->writer ) ) {
1040                         throw new MWException( __CLASS__.': must call startWrite() before calling set()' );
1041                 }
1042                 $this->writer->set( $key, serialize( $value ) );
1043         }
1044
1045         protected function getFileName( $code ) {
1046                 if ( !$code || strpos( $code, '/' ) !== false ) {
1047                         throw new MWException( __METHOD__.": Invalid language \"$code\"" );
1048                 }
1049                 return "{$this->directory}/l10n_cache-$code.cdb";
1050         }
1051 }
1052
1053 /**
1054  * Null store backend, used to avoid DB errors during install
1055  */
1056 class LCStore_Null implements LCStore {
1057         public function get( $code, $key ) {
1058                 return null;
1059         }
1060
1061         public function startWrite( $code ) {}
1062         public function finishWrite() {}
1063         public function set( $key, $value ) {}
1064 }
1065
1066 /**
1067  * A localisation cache optimised for loading large amounts of data for many
1068  * languages. Used by rebuildLocalisationCache.php.
1069  */
1070 class LocalisationCache_BulkLoad extends LocalisationCache {
1071         /**
1072          * A cache of the contents of data files.
1073          * Core files are serialized to avoid using ~1GB of RAM during a recache.
1074          */
1075         var $fileCache = array();
1076
1077         /**
1078          * Most recently used languages. Uses the linked-list aspect of PHP hashtables
1079          * to keep the most recently used language codes at the end of the array, and
1080          * the language codes that are ready to be deleted at the beginning.
1081          */
1082         var $mruLangs = array();
1083
1084         /**
1085          * Maximum number of languages that may be loaded into $this->data
1086          */
1087         var $maxLoadedLangs = 10;
1088
1089         /**
1090          * @param $fileName
1091          * @param $fileType
1092          * @return array|mixed
1093          */
1094         protected function readPHPFile( $fileName, $fileType ) {
1095                 $serialize = $fileType === 'core';
1096                 if ( !isset( $this->fileCache[$fileName][$fileType] ) ) {
1097                         $data = parent::readPHPFile( $fileName, $fileType );
1098
1099                         if ( $serialize ) {
1100                                 $encData = serialize( $data );
1101                         } else {
1102                                 $encData = $data;
1103                         }
1104
1105                         $this->fileCache[$fileName][$fileType] = $encData;
1106
1107                         return $data;
1108                 } elseif ( $serialize ) {
1109                         return unserialize( $this->fileCache[$fileName][$fileType] );
1110                 } else {
1111                         return $this->fileCache[$fileName][$fileType];
1112                 }
1113         }
1114
1115         /**
1116          * @param $code
1117          * @param $key
1118          * @return mixed
1119          */
1120         public function getItem( $code, $key ) {
1121                 unset( $this->mruLangs[$code] );
1122                 $this->mruLangs[$code] = true;
1123                 return parent::getItem( $code, $key );
1124         }
1125
1126         /**
1127          * @param $code
1128          * @param $key
1129          * @param $subkey
1130          * @return
1131          */
1132         public function getSubitem( $code, $key, $subkey ) {
1133                 unset( $this->mruLangs[$code] );
1134                 $this->mruLangs[$code] = true;
1135                 return parent::getSubitem( $code, $key, $subkey );
1136         }
1137
1138         /**
1139          * @param $code
1140          */
1141         public function recache( $code ) {
1142                 parent::recache( $code );
1143                 unset( $this->mruLangs[$code] );
1144                 $this->mruLangs[$code] = true;
1145                 $this->trimCache();
1146         }
1147
1148         /**
1149          * @param $code
1150          */
1151         public function unload( $code ) {
1152                 unset( $this->mruLangs[$code] );
1153                 parent::unload( $code );
1154         }
1155
1156         /**
1157          * Unload cached languages until there are less than $this->maxLoadedLangs
1158          */
1159         protected function trimCache() {
1160                 while ( count( $this->data ) > $this->maxLoadedLangs && count( $this->mruLangs ) ) {
1161                         reset( $this->mruLangs );
1162                         $code = key( $this->mruLangs );
1163                         wfDebug( __METHOD__.": unloading $code\n" );
1164                         $this->unload( $code );
1165                 }
1166         }
1167 }