RepoGroup.php

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<?php
class RepoGroup {
        var $localRepo;

        var $foreignRepos, $reposInitialised = false;
        var $localInfo, $foreignInfo;
        var $cache;

        protected static $instance;
        const MAX_CACHE_SIZE = 500;

        static function singleton() {
                if ( self::$instance ) {
                        return self::$instance;
                }
                global $wgLocalFileRepo, $wgForeignFileRepos;
                self::$instance = new RepoGroup( $wgLocalFileRepo, $wgForeignFileRepos );
                return self::$instance;
        }

        static function destroySingleton() {
                self::$instance = null;
        }

        static function setSingleton( $instance ) {
                self::$instance = $instance;
        }

        function __construct( $localInfo, $foreignInfo ) {
                $this->localInfo = $localInfo;
                $this->foreignInfo = $foreignInfo;
                $this->cache = array();
        }

        function findFile( $title, $options = array() ) {
                if ( !is_array( $options ) ) {
                        // MW 1.15 compat
                        $options = array( 'time' => $options );
                }
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }
                $title = File::normalizeTitle( $title );
                if ( !$title ) {
                        return false;
                }

                # Check the cache
                if ( empty( $options['ignoreRedirect'] )
                        && empty( $options['private'] )
                        && empty( $options['bypassCache'] ) )
                {
                        $time = isset( $options['time'] ) ? $options['time'] : '';
                        $dbkey = $title->getDBkey();
                        if ( isset( $this->cache[$dbkey][$time] ) ) {
                                wfDebug( __METHOD__.": got File:$dbkey from process cache\n" );
                                # Move it to the end of the list so that we can delete the LRU entry later
                                $this->pingCache( $dbkey );
                                # Return the entry
                                return $this->cache[$dbkey][$time];
                        }
                        $useCache = true;
                } else {
                        $useCache = false;
                }

                # Check the local repo
                $image = $this->localRepo->findFile( $title, $options );

                # Check the foreign repos
                if ( !$image ) {
                        foreach ( $this->foreignRepos as $repo ) {
                                $image = $repo->findFile( $title, $options );
                                if ( $image ) {
                                        break;
                                }
                        }
                }

                $image = $image ? $image : false; // type sanity
                # Cache file existence or non-existence
                if ( $useCache && ( !$image || $image->isCacheable() ) ) {
                        $this->trimCache();
                        $this->cache[$dbkey][$time] = $image;
                }

                return $image;
        }

        function findFiles( $inputItems ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }

                $items = array();
                foreach ( $inputItems as $item ) {
                        if ( !is_array( $item ) ) {
                                $item = array( 'title' => $item );
                        }
                        $item['title'] = File::normalizeTitle( $item['title'] );
                        if ( $item['title'] ) {
                                $items[$item['title']->getDBkey()] = $item;
                        }
                }

                $images = $this->localRepo->findFiles( $items );

                foreach ( $this->foreignRepos as $repo ) {
                        // Remove found files from $items
                        foreach ( $images as $name => $image ) {
                                unset( $items[$name] );
                        }

                        $images = array_merge( $images, $repo->findFiles( $items ) );
                }
                return $images;
        }

        function checkRedirect( Title $title ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }

                $redir = $this->localRepo->checkRedirect( $title );
                if( $redir ) {
                        return $redir;
                }
                foreach ( $this->foreignRepos as $repo ) {
                        $redir = $repo->checkRedirect( $title );
                        if ( $redir ) {
                                return $redir;
                        }
                }
                return false;
        }

        function findFileFromKey( $hash, $options = array() ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }

                $file = $this->localRepo->findFileFromKey( $hash, $options );
                if ( !$file ) {
                        foreach ( $this->foreignRepos as $repo ) {
                                $file = $repo->findFileFromKey( $hash, $options );
                                if ( $file ) break;
                        }
                }
                return $file;
        }

        function findBySha1( $hash ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }

                $result = $this->localRepo->findBySha1( $hash );
                foreach ( $this->foreignRepos as $repo ) {
                        $result = array_merge( $result, $repo->findBySha1( $hash ) );
                }
                usort( $result, 'File::compare' );
                return $result;
        }

        function findBySha1s( array $hashes ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }

                $result = $this->localRepo->findBySha1s( $hashes );
                foreach ( $this->foreignRepos as $repo ) {
                        $result = array_merge_recursive( $result, $repo->findBySha1s( $hashes ) );
                }
                //sort the merged (and presorted) sublist of each hash
                foreach( $result as $hash => $files ) {
                        usort( $result[$hash], 'File::compare' );
                }
                return $result;
        }

        function getRepo( $index ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }
                if ( $index === 'local' ) {
                        return $this->localRepo;
                } elseif ( isset( $this->foreignRepos[$index] ) ) {
                        return $this->foreignRepos[$index];
                } else {
                        return false;
                }
        }

        function getRepoByName( $name ) {
                if ( !$this->reposInitialised ) {
                        $this->initialiseRepos();
                }
                foreach ( $this->foreignRepos as $repo ) {
                        if ( $repo->name == $name ) {
                                return $repo;
                        }
                }
                return false;
        }

        function getLocalRepo() {
                return $this->getRepo( 'local' );
        }

        function forEachForeignRepo( $callback, $params = array() ) {
                foreach( $this->foreignRepos as $repo ) {
                        $args = array_merge( array( $repo ), $params );
                        if( call_user_func_array( $callback, $args ) ) {
                                return true;
                        }
                }
                return false;
        }

        function hasForeignRepos() {
                return (bool)$this->foreignRepos;
        }

        function initialiseRepos() {
                if ( $this->reposInitialised ) {
                        return;
                }
                $this->reposInitialised = true;

                $this->localRepo = $this->newRepo( $this->localInfo );
                $this->foreignRepos = array();
                foreach ( $this->foreignInfo as $key => $info ) {
                        $this->foreignRepos[$key] = $this->newRepo( $info );
                }
        }

        protected function newRepo( $info ) {
                $class = $info['class'];
                return new $class( $info );
        }

        function splitVirtualUrl( $url ) {
                if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
                        throw new MWException( __METHOD__.': unknown protocol' );
                }

                $bits = explode( '/', substr( $url, 9 ), 3 );
                if ( count( $bits ) != 3 ) {
                        throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
                }
                return $bits;
        }

        function getFileProps( $fileName ) {
                if ( FileRepo::isVirtualUrl( $fileName ) ) {
                        list( $repoName, /* $zone */, /* $rel */ ) = $this->splitVirtualUrl( $fileName );
                        if ( $repoName === '' ) {
                                $repoName = 'local';
                        }
                        $repo = $this->getRepo( $repoName );
                        return $repo->getFileProps( $fileName );
                } else {
                        return FSFile::getPropsFromPath( $fileName );
                }
        }

        protected function pingCache( $key ) {
                if ( isset( $this->cache[$key] ) ) {
                        $tmp = $this->cache[$key];
                        unset( $this->cache[$key] );
                        $this->cache[$key] = $tmp;
                }
        }

        protected function trimCache() {
                while ( count( $this->cache ) >= self::MAX_CACHE_SIZE ) {
                        reset( $this->cache );
                        $key = key( $this->cache );
                        wfDebug( __METHOD__.": evicting $key\n" );
                        unset( $this->cache[$key] );
                }
        }

        public function clearCache( Title $title = null ) {
                if ( $title == null ) {
                        $this->cache = array();
                } else {
                        $dbKey = $title->getDBkey();
                        if ( isset( $this->cache[$dbKey] ) ) {
                                unset( $this->cache[$dbKey] );
                        }
                }
        }
}