774 lines
21 KiB
PHP
774 lines
21 KiB
PHP
<?php
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/**
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* @file
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* @ingroup Cache
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*/
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/**
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*
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*/
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define( 'MSG_LOAD_TIMEOUT', 60);
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define( 'MSG_LOCK_TIMEOUT', 10);
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define( 'MSG_WAIT_TIMEOUT', 10);
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define( 'MSG_CACHE_VERSION', 1 );
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/**
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* Message cache
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* Performs various MediaWiki namespace-related functions
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* @ingroup Cache
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*/
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class MessageCache {
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/**
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* Process local cache of loaded messages that are defined in
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* MediaWiki namespace. First array level is a language code,
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* second level is message key and the values are either message
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* content prefixed with space, or !NONEXISTENT for negative
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* caching.
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*/
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protected $mCache;
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// Should mean that database cannot be used, but check
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protected $mDisable;
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/// Lifetime for cache, used by object caching
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protected $mExpiry;
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/**
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* Message cache has it's own parser which it uses to transform
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* messages.
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*/
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protected $mParserOptions, $mParser;
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/// Variable for tracking which variables are already loaded
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protected $mLoadedLanguages = array();
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function __construct( $memCached, $useDB, $expiry ) {
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if ( !$memCached ) {
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$memCached = wfGetCache( CACHE_NONE );
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}
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$this->mMemc = $memCached;
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$this->mDisable = !$useDB;
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$this->mExpiry = $expiry;
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}
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/**
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* ParserOptions is lazy initialised.
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*/
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function getParserOptions() {
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if ( !$this->mParserOptions ) {
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$this->mParserOptions = new ParserOptions;
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}
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return $this->mParserOptions;
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}
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/**
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* Try to load the cache from a local file.
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* Actual format of the file depends on the $wgLocalMessageCacheSerialized
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* setting.
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*
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* @param $hash String: the hash of contents, to check validity.
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* @param $code Mixed: Optional language code, see documenation of load().
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* @return false on failure.
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*/
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function loadFromLocal( $hash, $code ) {
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global $wgCacheDirectory, $wgLocalMessageCacheSerialized;
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$filename = "$wgCacheDirectory/messages-" . wfWikiID() . "-$code";
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# Check file existence
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wfSuppressWarnings();
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$file = fopen( $filename, 'r' );
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wfRestoreWarnings();
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if ( !$file ) {
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return false; // No cache file
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}
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if ( $wgLocalMessageCacheSerialized ) {
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// Check to see if the file has the hash specified
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$localHash = fread( $file, 32 );
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if ( $hash === $localHash ) {
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// All good, get the rest of it
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$serialized = '';
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while ( !feof( $file ) ) {
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$serialized .= fread( $file, 100000 );
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}
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fclose( $file );
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return $this->setCache( unserialize( $serialized ), $code );
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} else {
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fclose( $file );
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return false; // Wrong hash
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}
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} else {
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$localHash=substr(fread($file,40),8);
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fclose($file);
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if ($hash!=$localHash) {
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return false; // Wrong hash
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}
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# Require overwrites the member variable or just shadows it?
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require( $filename );
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return $this->setCache( $this->mCache, $code );
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}
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}
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/**
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* Save the cache to a local file.
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*/
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function saveToLocal( $serialized, $hash, $code ) {
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global $wgCacheDirectory;
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$filename = "$wgCacheDirectory/messages-" . wfWikiID() . "-$code";
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wfMkdirParents( $wgCacheDirectory ); // might fail
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wfSuppressWarnings();
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$file = fopen( $filename, 'w' );
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wfRestoreWarnings();
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if ( !$file ) {
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wfDebug( "Unable to open local cache file for writing\n" );
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return;
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}
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fwrite( $file, $hash . $serialized );
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fclose( $file );
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@chmod( $filename, 0666 );
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}
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function saveToScript( $array, $hash, $code ) {
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global $wgCacheDirectory;
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$filename = "$wgCacheDirectory/messages-" . wfWikiID() . "-$code";
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$tempFilename = $filename . '.tmp';
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wfMkdirParents( $wgCacheDirectory ); // might fail
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wfSuppressWarnings();
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$file = fopen( $tempFilename, 'w');
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wfRestoreWarnings();
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if ( !$file ) {
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wfDebug( "Unable to open local cache file for writing\n" );
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return;
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}
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fwrite($file,"<?php\n//$hash\n\n \$this->mCache = array(");
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foreach ($array as $key => $message) {
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$key = $this->escapeForScript($key);
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$messages = $this->escapeForScript($message);
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fwrite($file, "'$key' => '$message',\n");
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}
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fwrite($file,");\n?>");
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fclose($file);
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rename($tempFilename, $filename);
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}
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function escapeForScript($string) {
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$string = str_replace( '\\', '\\\\', $string );
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$string = str_replace( '\'', '\\\'', $string );
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return $string;
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}
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/**
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* Set the cache to $cache, if it is valid. Otherwise set the cache to false.
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*/
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function setCache( $cache, $code ) {
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if ( isset( $cache['VERSION'] ) && $cache['VERSION'] == MSG_CACHE_VERSION ) {
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$this->mCache[$code] = $cache;
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return true;
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} else {
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return false;
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}
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}
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/**
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* Loads messages from caches or from database in this order:
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* (1) local message cache (if $wgUseLocalMessageCache is enabled)
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* (2) memcached
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* (3) from the database.
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*
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* When succesfully loading from (2) or (3), all higher level caches are
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* updated for the newest version.
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*
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* Nothing is loaded if member variable mDisable is true, either manually
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* set by calling code or if message loading fails (is this possible?).
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*
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* Returns true if cache is already populated or it was succesfully populated,
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* or false if populating empty cache fails. Also returns true if MessageCache
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* is disabled.
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*
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* @param $code String: language to which load messages
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*/
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function load( $code = false ) {
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global $wgUseLocalMessageCache;
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if( !is_string( $code ) ) {
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# This isn't really nice, so at least make a note about it and try to
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# fall back
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wfDebug( __METHOD__ . " called without providing a language code\n" );
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$code = 'en';
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}
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# Don't do double loading...
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if ( isset($this->mLoadedLanguages[$code]) ) return true;
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# 8 lines of code just to say (once) that message cache is disabled
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if ( $this->mDisable ) {
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static $shownDisabled = false;
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if ( !$shownDisabled ) {
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wfDebug( __METHOD__ . ": disabled\n" );
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$shownDisabled = true;
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}
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return true;
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}
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# Loading code starts
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wfProfileIn( __METHOD__ );
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$success = false; # Keep track of success
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$where = array(); # Debug info, delayed to avoid spamming debug log too much
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$cacheKey = wfMemcKey( 'messages', $code ); # Key in memc for messages
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# (1) local cache
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# Hash of the contents is stored in memcache, to detect if local cache goes
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# out of date (due to update in other thread?)
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if ( $wgUseLocalMessageCache ) {
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wfProfileIn( __METHOD__ . '-fromlocal' );
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$hash = $this->mMemc->get( wfMemcKey( 'messages', $code, 'hash' ) );
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if ( $hash ) {
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$success = $this->loadFromLocal( $hash, $code );
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if ( $success ) $where[] = 'got from local cache';
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}
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wfProfileOut( __METHOD__ . '-fromlocal' );
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}
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# (2) memcache
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# Fails if nothing in cache, or in the wrong version.
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if ( !$success ) {
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wfProfileIn( __METHOD__ . '-fromcache' );
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$cache = $this->mMemc->get( $cacheKey );
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$success = $this->setCache( $cache, $code );
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if ( $success ) {
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$where[] = 'got from global cache';
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$this->saveToCaches( $cache, false, $code );
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}
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wfProfileOut( __METHOD__ . '-fromcache' );
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}
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# (3)
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# Nothing in caches... so we need create one and store it in caches
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if ( !$success ) {
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$where[] = 'cache is empty';
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$where[] = 'loading from database';
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$this->lock($cacheKey);
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# Limit the concurrency of loadFromDB to a single process
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# This prevents the site from going down when the cache expires
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$statusKey = wfMemcKey( 'messages', $code, 'status' );
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$success = $this->mMemc->add( $statusKey, 'loading', MSG_LOAD_TIMEOUT );
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if ( $success ) {
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$cache = $this->loadFromDB( $code );
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$success = $this->setCache( $cache, $code );
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}
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if ( $success ) {
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$success = $this->saveToCaches( $cache, true, $code );
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if ( $success ) {
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$this->mMemc->delete( $statusKey );
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} else {
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$this->mMemc->set( $statusKey, 'error', 60*5 );
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wfDebug( "MemCached set error in MessageCache: restart memcached server!\n" );
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}
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}
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$this->unlock($cacheKey);
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}
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if ( !$success ) {
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# Bad luck... this should not happen
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$where[] = 'loading FAILED - cache is disabled';
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$info = implode( ', ', $where );
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wfDebug( __METHOD__ . ": Loading $code... $info\n" );
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$this->mDisable = true;
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$this->mCache = false;
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} else {
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# All good, just record the success
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$info = implode( ', ', $where );
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wfDebug( __METHOD__ . ": Loading $code... $info\n" );
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$this->mLoadedLanguages[$code] = true;
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}
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wfProfileOut( __METHOD__ );
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return $success;
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}
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/**
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* Loads cacheable messages from the database. Messages bigger than
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* $wgMaxMsgCacheEntrySize are assigned a special value, and are loaded
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* on-demand from the database later.
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*
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* @param $code Optional language code, see documenation of load().
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* @return Array: Loaded messages for storing in caches.
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*/
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function loadFromDB( $code = false ) {
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wfProfileIn( __METHOD__ );
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global $wgMaxMsgCacheEntrySize, $wgContLanguageCode;
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$dbr = wfGetDB( DB_SLAVE );
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$cache = array();
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# Common conditions
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$conds = array(
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'page_is_redirect' => 0,
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'page_namespace' => NS_MEDIAWIKI,
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);
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if ( $code ) {
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# Is this fast enough. Should not matter if the filtering is done in the
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# database or in code.
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if ( $code !== $wgContLanguageCode ) {
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# Messages for particular language
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$conds[] = 'page_title' . $dbr->buildLike( $dbr->anyString(), "/$code" );
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} else {
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# Effectively disallows use of '/' character in NS_MEDIAWIKI for uses
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# other than language code.
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$conds[] = 'page_title NOT' . $dbr->buildLike( $dbr->anyString(), '/', $dbr->anyString() );
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}
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}
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# Conditions to fetch oversized pages to ignore them
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$bigConds = $conds;
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$bigConds[] = 'page_len > ' . intval( $wgMaxMsgCacheEntrySize );
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# Load titles for all oversized pages in the MediaWiki namespace
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$res = $dbr->select( 'page', 'page_title', $bigConds, __METHOD__ . "($code)-big" );
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foreach ( $res as $row ) {
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$cache[$row->page_title] = '!TOO BIG';
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}
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# Conditions to load the remaining pages with their contents
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$smallConds = $conds;
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$smallConds[] = 'page_latest=rev_id';
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$smallConds[] = 'rev_text_id=old_id';
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$smallConds[] = 'page_len <= ' . intval( $wgMaxMsgCacheEntrySize );
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$res = $dbr->select( array( 'page', 'revision', 'text' ),
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array( 'page_title', 'old_text', 'old_flags' ),
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$smallConds, __METHOD__ . "($code)-small" );
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foreach ( $res as $row ) {
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$cache[$row->page_title] = ' ' . Revision::getRevisionText( $row );
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}
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$cache['VERSION'] = MSG_CACHE_VERSION;
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wfProfileOut( __METHOD__ );
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return $cache;
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}
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/**
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* Updates cache as necessary when message page is changed
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*
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* @param $title String: name of the page changed.
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* @param $text Mixed: new contents of the page.
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*/
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public function replace( $title, $text ) {
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global $wgMaxMsgCacheEntrySize;
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wfProfileIn( __METHOD__ );
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if ( $this->mDisable ) {
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return;
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}
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list( , $code ) = $this->figureMessage( $title );
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$cacheKey = wfMemcKey( 'messages', $code );
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$this->load( $code );
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$this->lock( $cacheKey );
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$titleKey = wfMemcKey( 'messages', 'individual', $title );
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if ( $text === false ) {
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# Article was deleted
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$this->mCache[$code][$title] = '!NONEXISTENT';
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$this->mMemc->delete( $titleKey );
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} elseif ( strlen( $text ) > $wgMaxMsgCacheEntrySize ) {
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# Check for size
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$this->mCache[$code][$title] = '!TOO BIG';
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$this->mMemc->set( $titleKey, ' ' . $text, $this->mExpiry );
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} else {
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$this->mCache[$code][$title] = ' ' . $text;
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$this->mMemc->delete( $titleKey );
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}
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# Update caches
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$this->saveToCaches( $this->mCache[$code], true, $code );
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$this->unlock( $cacheKey );
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// Also delete cached sidebar... just in case it is affected
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$codes = array( $code );
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if ( $code === 'en' ) {
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// Delete all sidebars, like for example on action=purge on the
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// sidebar messages
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$codes = array_keys( Language::getLanguageNames() );
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}
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global $parserMemc;
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foreach ( $codes as $code ) {
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$sidebarKey = wfMemcKey( 'sidebar', $code );
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$parserMemc->delete( $sidebarKey );
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}
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wfRunHooks( "MessageCacheReplace", array( $title, $text ) );
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wfProfileOut( __METHOD__ );
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}
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/**
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* Shortcut to update caches.
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*
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* @param $cache Array: cached messages with a version.
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* @param $memc Bool: Wether to update or not memcache.
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* @param $code String: Language code.
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* @return False on somekind of error.
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*/
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protected function saveToCaches( $cache, $memc = true, $code = false ) {
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wfProfileIn( __METHOD__ );
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global $wgUseLocalMessageCache, $wgLocalMessageCacheSerialized;
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$cacheKey = wfMemcKey( 'messages', $code );
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if ( $memc ) {
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$success = $this->mMemc->set( $cacheKey, $cache, $this->mExpiry );
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} else {
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$success = true;
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}
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# Save to local cache
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if ( $wgUseLocalMessageCache ) {
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$serialized = serialize( $cache );
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$hash = md5( $serialized );
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$this->mMemc->set( wfMemcKey( 'messages', $code, 'hash' ), $hash, $this->mExpiry );
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if ($wgLocalMessageCacheSerialized) {
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$this->saveToLocal( $serialized, $hash, $code );
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} else {
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$this->saveToScript( $cache, $hash, $code );
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}
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}
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wfProfileOut( __METHOD__ );
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return $success;
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}
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/**
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* Represents a write lock on the messages key
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*
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* @return Boolean: success
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*/
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function lock($key) {
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$lockKey = $key . ':lock';
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for ($i=0; $i < MSG_WAIT_TIMEOUT && !$this->mMemc->add( $lockKey, 1, MSG_LOCK_TIMEOUT ); $i++ ) {
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sleep(1);
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}
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return $i >= MSG_WAIT_TIMEOUT;
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}
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function unlock($key) {
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$lockKey = $key . ':lock';
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$this->mMemc->delete( $lockKey );
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}
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/**
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* Get a message from either the content language or the user language.
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*
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* @param $key String: the message cache key
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* @param $useDB Boolean: get the message from the DB, false to use only
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* the localisation
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* @param $langcode String: code of the language to get the message for, if
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* it is a valid code create a language for that language,
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* if it is a string but not a valid code then make a basic
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* language object, if it is a false boolean then use the
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* current users language (as a fallback for the old
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* parameter functionality), or if it is a true boolean
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* then use the wikis content language (also as a
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* fallback).
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* @param $isFullKey Boolean: specifies whether $key is a two part key
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* "msg/lang".
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*/
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function get( $key, $useDB = true, $langcode = true, $isFullKey = false ) {
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global $wgContLanguageCode, $wgContLang;
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if ( !is_string( $key ) ) {
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throw new MWException( "Non-string key given" );
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}
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if ( strval( $key ) === '' ) {
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# Shortcut: the empty key is always missing
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return false;
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}
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$lang = wfGetLangObj( $langcode );
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$langcode = $lang->getCode();
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$message = false;
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# Normalise title-case input (with some inlining)
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$lckey = str_replace( ' ', '_', $key );
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if ( ord( $key ) < 128 ) {
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$lckey[0] = strtolower( $lckey[0] );
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$uckey = ucfirst( $lckey );
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} else {
|
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$lckey = $wgContLang->lcfirst( $lckey );
|
|
$uckey = $wgContLang->ucfirst( $lckey );
|
|
}
|
|
|
|
# Try the MediaWiki namespace
|
|
if( !$this->mDisable && $useDB ) {
|
|
$title = $uckey;
|
|
if(!$isFullKey && ( $langcode != $wgContLanguageCode ) ) {
|
|
$title .= '/' . $langcode;
|
|
}
|
|
$message = $this->getMsgFromNamespace( $title, $langcode );
|
|
}
|
|
|
|
# Try the array in the language object
|
|
if ( $message === false ) {
|
|
$message = $lang->getMessage( $lckey );
|
|
if ( is_null( $message ) ) {
|
|
$message = false;
|
|
}
|
|
}
|
|
|
|
# Try the array of another language
|
|
if( $message === false ) {
|
|
$parts = explode( '/', $lckey );
|
|
# We may get calls for things that are http-urls from sidebar
|
|
# Let's not load nonexistent languages for those
|
|
# They usually have more than one slash.
|
|
if ( count( $parts ) == 2 && $parts[1] !== '' ) {
|
|
$message = Language::getMessageFor( $parts[0], $parts[1] );
|
|
if ( is_null( $message ) ) {
|
|
$message = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
# Is this a custom message? Try the default language in the db...
|
|
if( ($message === false || $message === '-' ) &&
|
|
!$this->mDisable && $useDB &&
|
|
!$isFullKey && ($langcode != $wgContLanguageCode) ) {
|
|
$message = $this->getMsgFromNamespace( $uckey, $wgContLanguageCode );
|
|
}
|
|
|
|
# Final fallback
|
|
if( $message === false ) {
|
|
return false;
|
|
}
|
|
|
|
# Fix whitespace
|
|
$message = strtr( $message,
|
|
array(
|
|
# Fix for trailing whitespace, removed by textarea
|
|
' ' => ' ',
|
|
# Fix for NBSP, converted to space by firefox
|
|
' ' => "\xc2\xa0",
|
|
' ' => "\xc2\xa0",
|
|
) );
|
|
|
|
return $message;
|
|
}
|
|
|
|
/**
|
|
* Get a message from the MediaWiki namespace, with caching. The key must
|
|
* first be converted to two-part lang/msg form if necessary.
|
|
*
|
|
* @param $title String: Message cache key with initial uppercase letter.
|
|
* @param $code String: code denoting the language to try.
|
|
*/
|
|
function getMsgFromNamespace( $title, $code ) {
|
|
$type = false;
|
|
$message = false;
|
|
|
|
$this->load( $code );
|
|
if ( isset( $this->mCache[$code][$title] ) ) {
|
|
$entry = $this->mCache[$code][$title];
|
|
if ( substr( $entry, 0, 1 ) === ' ' ) {
|
|
return substr( $entry, 1 );
|
|
} elseif ( $entry === '!NONEXISTENT' ) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
# Call message hooks, in case they are defined
|
|
wfRunHooks('MessagesPreLoad', array( $title, &$message ) );
|
|
if ( $message !== false ) {
|
|
return $message;
|
|
}
|
|
|
|
# Try the individual message cache
|
|
$titleKey = wfMemcKey( 'messages', 'individual', $title );
|
|
$entry = $this->mMemc->get( $titleKey );
|
|
if ( $entry ) {
|
|
if ( substr( $entry, 0, 1 ) === ' ' ) {
|
|
$this->mCache[$code][$title] = $entry;
|
|
return substr( $entry, 1 );
|
|
} elseif ( $entry === '!NONEXISTENT' ) {
|
|
$this->mCache[$code][$title] = '!NONEXISTENT';
|
|
return false;
|
|
} else {
|
|
# Corrupt/obsolete entry, delete it
|
|
$this->mMemc->delete( $titleKey );
|
|
}
|
|
}
|
|
|
|
# Try loading it from the database
|
|
$revision = Revision::newFromTitle( Title::makeTitle( NS_MEDIAWIKI, $title ) );
|
|
if ( $revision ) {
|
|
$message = $revision->getText();
|
|
$this->mCache[$code][$title] = ' ' . $message;
|
|
$this->mMemc->set( $titleKey, ' ' . $message, $this->mExpiry );
|
|
} else {
|
|
$this->mCache[$code][$title] = '!NONEXISTENT';
|
|
$this->mMemc->set( $titleKey, '!NONEXISTENT', $this->mExpiry );
|
|
}
|
|
|
|
return $message;
|
|
}
|
|
|
|
function transform( $message, $interface = false, $language = null ) {
|
|
// Avoid creating parser if nothing to transform
|
|
if( strpos( $message, '{{' ) === false ) {
|
|
return $message;
|
|
}
|
|
|
|
global $wgParser, $wgParserConf;
|
|
if ( !$this->mParser && isset( $wgParser ) ) {
|
|
# Do some initialisation so that we don't have to do it twice
|
|
$wgParser->firstCallInit();
|
|
# Clone it and store it
|
|
$class = $wgParserConf['class'];
|
|
if ( $class == 'Parser_DiffTest' ) {
|
|
# Uncloneable
|
|
$this->mParser = new $class( $wgParserConf );
|
|
} else {
|
|
$this->mParser = clone $wgParser;
|
|
}
|
|
#wfDebug( __METHOD__ . ": following contents triggered transform: $message\n" );
|
|
}
|
|
if ( $this->mParser ) {
|
|
$popts = $this->getParserOptions();
|
|
$popts->setInterfaceMessage( $interface );
|
|
$popts->setTargetLanguage( $language );
|
|
$message = $this->mParser->transformMsg( $message, $popts );
|
|
}
|
|
return $message;
|
|
}
|
|
|
|
function disable() { $this->mDisable = true; }
|
|
function enable() { $this->mDisable = false; }
|
|
|
|
/** @deprecated */
|
|
function disableTransform(){
|
|
wfDeprecated( __METHOD__ );
|
|
}
|
|
function enableTransform() {
|
|
wfDeprecated( __METHOD__ );
|
|
}
|
|
function setTransform( $x ) {
|
|
wfDeprecated( __METHOD__ );
|
|
}
|
|
function getTransform() {
|
|
wfDeprecated( __METHOD__ );
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Clear all stored messages. Mainly used after a mass rebuild.
|
|
*/
|
|
function clear() {
|
|
$langs = Language::getLanguageNames( false );
|
|
foreach ( array_keys($langs) as $code ) {
|
|
# Global cache
|
|
$this->mMemc->delete( wfMemcKey( 'messages', $code ) );
|
|
# Invalidate all local caches
|
|
$this->mMemc->delete( wfMemcKey( 'messages', $code, 'hash' ) );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add a message to the cache
|
|
* @deprecated Use $wgExtensionMessagesFiles
|
|
*
|
|
* @param $key Mixed
|
|
* @param $value Mixed
|
|
* @param $lang String: the messages language, English by default
|
|
*/
|
|
function addMessage( $key, $value, $lang = 'en' ) {
|
|
wfDeprecated( __METHOD__ );
|
|
$lc = Language::getLocalisationCache();
|
|
$lc->addLegacyMessages( array( $lang => array( $key => $value ) ) );
|
|
}
|
|
|
|
/**
|
|
* Add an associative array of message to the cache
|
|
* @deprecated Use $wgExtensionMessagesFiles
|
|
*
|
|
* @param $messages Array: an associative array of key => values to be added
|
|
* @param $lang String: the messages language, English by default
|
|
*/
|
|
function addMessages( $messages, $lang = 'en' ) {
|
|
wfDeprecated( __METHOD__ );
|
|
$lc = Language::getLocalisationCache();
|
|
$lc->addLegacyMessages( array( $lang => $messages ) );
|
|
}
|
|
|
|
/**
|
|
* Add a 2-D array of messages by lang. Useful for extensions.
|
|
* @deprecated Use $wgExtensionMessagesFiles
|
|
*
|
|
* @param $messages Array: the array to be added
|
|
*/
|
|
function addMessagesByLang( $messages ) {
|
|
wfDeprecated( __METHOD__ );
|
|
$lc = Language::getLocalisationCache();
|
|
$lc->addLegacyMessages( $messages );
|
|
}
|
|
|
|
/**
|
|
* Set a hook for addMessagesByLang()
|
|
*/
|
|
function setExtensionMessagesHook( $callback ) {
|
|
$this->mAddMessagesHook = $callback;
|
|
}
|
|
|
|
/**
|
|
* @deprecated
|
|
*/
|
|
function loadAllMessages( $lang = false ) {
|
|
}
|
|
|
|
/**
|
|
* @deprecated
|
|
*/
|
|
function loadMessagesFile( $filename, $langcode = false ) {
|
|
}
|
|
|
|
public function figureMessage( $key ) {
|
|
global $wgContLanguageCode;
|
|
$pieces = explode( '/', $key );
|
|
if( count( $pieces ) < 2 )
|
|
return array( $key, $wgContLanguageCode );
|
|
|
|
$lang = array_pop( $pieces );
|
|
$validCodes = Language::getLanguageNames();
|
|
if( !array_key_exists( $lang, $validCodes ) )
|
|
return array( $key, $wgContLanguageCode );
|
|
|
|
$message = implode( '/', $pieces );
|
|
return array( $message, $lang );
|
|
}
|
|
|
|
}
|