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