Apache でディスクキャッシュを削除する方法をまとめて解説してみた

<VirtualHost *:80>
	...
	ServerName www.example.com
	...
	DocumentRoot /var/www/html
	...
	<IfModule mod_disk_cache.c>
		...
		CacheDirLevels 2
		CacheDirLength 1
		...
		CacheDefaultExpire 3600
		CacheMaxExpire 7200
		...
	</IfModule>
 
</VirtualHost>

<VirtualHost *:80>
	...
	ServerName www.example.com
	...
	DocumentRoot /var/www/html
	...
	<IfModule mod_disk_cache.c>
		...
		CacheDirLevels 2
		CacheDirLength 1
		...
		CacheRoot /tmp/cache
		...
	</IfModule>
 
</VirtualHost>

$ rm -fR /tmp/cache/*

<VirtualHost *:80>
	...
	ServerName www.example.com
	...
	DocumentRoot /var/www/html
	...
	<IfModule mod_disk_cache.c>
		...
		CacheDirLevels 2
		CacheDirLength 1
		...
		CacheRoot /tmp/cache
		...
	</IfModule>
 
</VirtualHost>

$ find /tmp/cache -type f -name "*.header"   -exec grep -l "http://example.com:80/?Expires:"  {} \; | sed -e s/\.header/\.\*/g | xargs rm -f

<?php
 
if($argc>=4){
	//	chek of parameters
	$params = array(
		'-c' => array( 'pattern' => '/-c=([^\s]*)/i', 'required' => true ,'valindex' => 1 ),
		'-l' => array( 'pattern' => '/-l=([^\s]*)/i', 'required' => true ,'valindex' => 1),
		'-u' => array( 'pattern' => '/-u=([^\s]*)/i', 'required' => true ,'valindex' => 1),
		'-d' => array( 'pattern' => '/-d/i' , 'required' => false ,'valindex' => 0),
	);
	for($ni=1;$ni<$argc;$ni++){
		foreach($params as $pkey => $param){
			$output = array();
			if(preg_match ( $param['pattern'], $argv[$ni],$output)){
				$params[$pkey]['val'] = $output[$param['valindex']];
				break;
			}
		}
	}
	foreach($params as $pkey => $param){
		if($param['required'] && empty($param['val'])){
			echo 'error : do not input "'.$pkey.'" paramater.'."\n";
			return;
		}
	}
 
	//	set of parameters
	$cach_path = $params['-c']['val'];
	$file_key_org  = $params['-u']['val'];
	$file_key  = md5($params['-u']['val']);
	$level_keys= preg_split("/:/", $params['-l']['val']);
	$debug = !empty($params['-d']['val']);
 
	//	convert apache
	$digest = array();
	$enc_table =	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_@";
 
	$hex_v = '';
	for($n=0,$k=0;$n<16;$n++,$k+=2){
		$hex_v = substr($file_key,$k,2);
		sscanf($hex_v, "%x", $digest[$n]);
	}
 
	$tmp = array();
	for ($i = 0, $k = 0; $i < 15; $i += 3) {
		$x = ($digest[$i] << 16) | ($digest[$i + 1] << 8) | $digest[$i + 2];
		$tmp[$k++] = $enc_table[$x >> 18];
		$tmp[$k++] = $enc_table[($x >> 12) & 0x3f];
		$tmp[$k++] = $enc_table[($x >> 6) & 0x3f];
		$tmp[$k++] = $enc_table[$x & 0x3f];
	}
 
	$x = $digest[15];
	$tmp[$k++] = $enc_table[$x >> 2];
	$tmp[$k++] = $enc_table[($x << 4) & 0x3f];
 
	$file_key_c = implode("",$tmp);
 
	if(substr($cach_path,-1,1)==DIRECTORY_SEPARATOR){
		$cach_file = substr($cach_path,0,-1);
	} else {
		$cach_file = $cach_path;
	}
	$offset = 0;
	foreach($level_keys as $level){
		$ilevel = intval($level);
		$cach_file .=  DIRECTORY_SEPARATOR.substr($file_key_c,$offset,$ilevel);
		$offset += $ilevel;
	}
	if($offset>0){
		$file_key_c = substr($file_key_c,$offset);
	}
 
	//	create cache file name.
	$success = false;
	$cach_file_d  =  $cach_file;
	$cach_file   .=  DIRECTORY_SEPARATOR.$file_key_c.'.header';
	$cach_file_d .=  DIRECTORY_SEPARATOR.$file_key_c.'.data';
	$cach_file_exist =  file_exists($cach_file);
	if($cach_file_exist){
		$file_content = file_get_contents($cach_file);
		if(strpos($file_content,$file_key_org )!==false){
			//	sure file, remove the cache
			if(!$debug) {
				@unlink($cach_file_d);
				$success = unlink($cach_file);
			} else {
				$success = true;
 
			}
		}
	}
	if($success) {
		echo 'Removed:'.$cach_file."\n";
		echo 'Removed:'.$cach_file_d."\n";
	} else {
		echo 'Can not removed'.($cach_file_exist ? '(Error):':'(not Found):').$cach_file."\n";
	}
 
	if($debug) {
		// debug informations.
		echo "parameters:\n";
		foreach($params as $pkey => $param){
			echo '  "'.$pkey.'":'.$param['val']."\n";
		}
		echo "Cach file(Header):".$cach_file."\n";
		echo "Cach file(Data)  :".$cach_file_d."\n";
		echo "Cach file exist ? ".($cach_file_exist ? '(Error):':'(not Found):')."\n";
	}
 
} else {
	//	show usage
	echo 'Usage : php '.basename(__FILE__).' -c=%cache path% -l=%level% -u=%url% [-d]'."\n";
	echo ' ex.) '."\n";
	echo '   php '.basename(__FILE__).' -c=/var/cache/httpd -l=1:2 -u=http://example.com:80/sample.html?'."\n";
	echo '   "-d" options is debug mode. debug mode will not remove cache file.'."\n";
}
 
 
?>

$ php rm_cache.php -c=/tmp/cache -l=1:1 -u=http://exmaple.com:80/?
Removed:/tmp/cache/K/J/yoYNk2uot3Lia4URvdmw.header
Removed:/tmp/cache/K/J/yoYNk2uot3Lia4URvdmw.data