151 lines
3.6 KiB
PHP
151 lines
3.6 KiB
PHP
<?
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# Handles talking to the file cache, putting stuff in and taking it back out.
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# Mostly called from Article.php, also from DatabaseFunctions.php for the
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# emergency abort/fallback to cache.
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# Global options that affect this module:
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# $wgCachePages
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# $wgCacheEpoch
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# $wgUseFileCache
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# $wgFileCacheDirectory
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# $wgUseGzip
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include_once( "Title.php" );
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class CacheManager {
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var $mTitle, $mFileCache;
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function CacheManager( &$title ) {
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$this->mTitle =& $title;
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$this->mFileCache = "";
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}
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function fileCacheName() {
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global $wgFileCacheDirectory, $wgLang;
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if( !$this->mFileCache ) {
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$hash = md5( $key = $this->mTitle->getDbkey() );
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if( $this->mTitle->getNamespace() )
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$key = $wgLang->getNsText( $this->mTitle->getNamespace() ) . ":" . $key;
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$key = str_replace( ".", "%2E", urlencode( $key ) );
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$hash1 = substr( $hash, 0, 1 );
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$hash2 = substr( $hash, 0, 2 );
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$this->mFileCache = "{$wgFileCacheDirectory}/{$hash1}/{$hash2}/{$key}.html";
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if($this->useGzip())
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$this->mFileCache .= ".gz";
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wfDebug( " fileCacheName() - {$this->mFileCache}\n" );
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}
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return $this->mFileCache;
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}
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function isFileCached() {
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return file_exists( $this->fileCacheName() );
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}
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function fileCacheTime() {
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return wfUnix2Timestamp( filemtime( $this->fileCacheName() ) );
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}
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function isFileCacheGood( $timestamp ) {
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global $wgCacheEpoch;
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if( !$this->isFileCached() ) return false;
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$cachetime = $this->fileCacheTime();
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$good = (( $timestamp <= $cachetime ) &&
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( $wgCacheEpoch <= $cachetime ));
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wfDebug(" isFileCacheGood() - cachetime $cachetime, touched {$timestamp} epoch {$wgCacheEpoch}, good $good\n");
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return $good;
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}
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function useGzip() {
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global $wgUseGzip;
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return $wgUseGzip;
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}
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/* In handy string packages */
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function fetchRawText() {
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return file_get_contents( $this->fileCacheName() );
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}
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function fetchPageText() {
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if( $this->useGzip() ) {
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/* Why is there no gzfile_get_contents() or gzdecode()? */
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return implode( "", gzfile( $this->fileCacheName() ) );
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} else {
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return $this->fetchRawText();
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}
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}
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/* Working directory to/from output */
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function loadFromFileCache() {
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global $wgOut;
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wfDebug(" loadFromFileCache()\n");
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$filename=$this->fileCacheName();
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$wgOut->sendCacheControl();
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if( $this->useGzip() ) {
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if( wfClientAcceptsGzip() ) {
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header( "Content-Encoding: gzip" );
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} else {
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/* Send uncompressed */
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readgzfile( $filename );
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return;
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}
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}
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readfile( $filename );
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}
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function checkCacheDirs() {
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$filename = $this->fileCacheName();
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$mydir2=substr($filename,0,strrpos($filename,"/")); # subdirectory level 2
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$mydir1=substr($mydir2,0,strrpos($mydir2,"/")); # subdirectory level 1
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if(!file_exists($mydir1)) { mkdir($mydir1,0775); } # create if necessary
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if(!file_exists($mydir2)) { mkdir($mydir2,0775); }
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}
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function saveToFileCache( $text ) {
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if(strcmp($text,"") == 0) return "";
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wfDebug(" saveToFileCache()\n", false);
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$this->checkCacheDirs();
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$f = fopen( $this->fileCacheName(), "w" );
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if($f) {
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$now = wfTimestampNow();
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if( $this->useGzip() ) {
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$rawtext = str_replace( "</html>",
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"<!-- Cached/compressed $now -->\n</html>",
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$text );
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$text = gzencode( $rawtext );
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} else {
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$text = str_replace( "</html>",
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"<!-- Cached $now -->\n</html>",
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$text );
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}
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fwrite( $f, $text );
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fclose( $f );
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if( $this->useGzip() ) {
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if( wfClientAcceptsGzip() ) {
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header( "Content-Encoding: gzip" );
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return $text;
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} else {
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return $rawtext;
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}
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} else {
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return $text;
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}
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}
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return $text;
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}
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}
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?>
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