AlkantarClanX12
Your IP : 52.14.209.100
<?php
namespace W3TC;
/**
* class Cache_File
*/
class Cache_File extends Cache_Base {
/**
* Path to cache dir
*
* @var string
*/
protected $_cache_dir = '';
/**
* Directory to flush
*
* @var string
*/
protected $_flush_dir = '';
/**
* Exclude files
*
* @var array
*/
protected $_exclude = array();
/**
* Flush time limit
*
* @var int
*/
protected $_flush_timelimit = 0;
/**
* File locking
*
* @var boolean
*/
protected $_locking = false;
/**
* If path should be generated based on wp_hash
*
* @var bool
*/
protected $_use_wp_hash = false;
/**
* Constructor
*
* @param array $config
*/
function __construct( $config = array() ) {
parent::__construct( $config );
if ( isset( $config['cache_dir'] ) )
$this->_cache_dir = trim( $config['cache_dir'] );
else
$this->_cache_dir = Util_Environment::cache_blog_dir( $config['section'], $config['blog_id'] );
$this->_exclude = isset( $config['exclude'] ) ? (array) $config['exclude'] : array();
$this->_flush_timelimit = isset( $config['flush_timelimit'] ) ? (int) $config['flush_timelimit'] : 180;
$this->_locking = isset( $config['locking'] ) ? (boolean) $config['locking'] : false;
if ( isset( $config['flush_dir'] ) )
$this->_flush_dir = $config['flush_dir'];
else {
if ( $config['blog_id'] <= 0 && !isset( $config['cache_dir'] ) ) {
// clear whole section if we operate on master cache
// and in a mode when cache_dir not strictly specified
$this->_flush_dir = Util_Environment::cache_dir( $config['section'] );
} else
$this->_flush_dir = $this->_cache_dir;
}
if ( isset( $config['use_wp_hash'] ) && $config['use_wp_hash'] )
$this->_use_wp_hash = true;
}
/**
* Adds data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function add( $key, &$var, $expire = 0, $group = '' ) {
if ( $this->get( $key, $group ) === false ) {
return $this->set( $key, $var, $expire, $group );
}
return false;
}
/**
* Sets data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function set( $key, $var, $expire = 0, $group = '' ) {
$fp = $this->fopen_write( $key, $group, 'wb' );
if ( !$fp )
return false;
if ( $this->_locking )
@flock( $fp, LOCK_EX );
if ( $expire <= 0 || $expire > W3TC_CACHE_FILE_EXPIRE_MAX )
$expire = W3TC_CACHE_FILE_EXPIRE_MAX;
$expires_at = time() + $expire;
@fputs( $fp, pack( 'L', $expires_at ) );
@fputs( $fp, '<?php exit; ?>' );
@fputs( $fp, @serialize( $var ) );
@fclose( $fp );
if ( $this->_locking )
@flock( $fp, LOCK_UN );
return true;
}
/**
* Returns data
*
* @param string $key
* @param string $group Used to differentiate between groups of cache values
* @return mixed
*/
function get_with_old( $key, $group = '' ) {
list( $data, $has_old_data ) = $this->_get_with_old_raw( $key, $group );
if ( !empty( $data ) )
$data_unserialized = @unserialize( $data );
else
$data_unserialized = $data;
return array( $data_unserialized, $has_old_data );
}
private function _get_with_old_raw( $key, $group = '' ) {
$has_old_data = false;
$storage_key = $this->get_item_key( $key );
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . $this->_get_path( $storage_key, $group );
if ( !is_readable( $path ) )
return array( null, $has_old_data );
$fp = @fopen( $path, 'rb' );
if ( ! $fp || 4 > filesize( $path ) ) {
return array( null, $has_old_data );
}
if ( $this->_locking )
@flock( $fp, LOCK_SH );
$expires_at = @fread( $fp, 4 );
$data = null;
if ( $expires_at !== false ) {
list( , $expires_at ) = @unpack( 'L', $expires_at );
if ( time() > $expires_at ) {
if ( $this->_use_expired_data ) {
// update expiration so other threads will use old data
$fp2 = @fopen( $path, 'cb' );
if ( $fp2 ) {
@fputs( $fp2, pack( 'L', time() + 30 ) );
@fclose( $fp2 );
}
$has_old_data = true;
}
} else {
$data = '';
while ( !@feof( $fp ) ) {
$data .= @fread( $fp, 4096 );
}
$data = substr( $data, 14 );
}
}
if ( $this->_locking )
@flock( $fp, LOCK_UN );
@fclose( $fp );
return array( $data, $has_old_data );
}
/**
* Replaces data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function replace( $key, &$var, $expire = 0, $group = '' ) {
if ( $this->get( $key, $group ) !== false ) {
return $this->set( $key, $var, $expire, $group );
}
return false;
}
/**
* Deletes data
*
* @param string $key
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function delete( $key, $group = '' ) {
$storage_key = $this->get_item_key( $key );
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . $this->_get_path( $storage_key, $group );
if ( !file_exists( $path ) )
return true;
if ( $this->_use_expired_data ) {
$fp = @fopen( $path, 'cb' );
if ( $fp ) {
if ( $this->_locking )
@flock( $fp, LOCK_EX );
@fputs( $fp, pack( 'L', 0 ) ); // make it expired
@fclose( $fp );
if ( $this->_locking )
@flock( $fp, LOCK_UN );
return true;
}
}
return @unlink( $path );
}
/**
* Deletes _old and primary if exists.
*
* @param string $key
*
* @return bool
*/
function hard_delete( $key, $group = '' ) {
$key = $this->get_item_key( $key );
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . $this->_get_path( $key, $group );
return @unlink( $path );
}
/**
* Flushes all data
*
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function flush( $group = '' ) {
@set_time_limit( $this->_flush_timelimit );
if ( 'sitemaps' === $group ) {
$config = Dispatcher::config();
$sitemap_regex = $config->get_string( 'pgcache.purge.sitemap_regex' );
$this->_flush_based_on_regex( $sitemap_regex );
} else {
$flush_dir = $group ?
$this->_cache_dir . DIRECTORY_SEPARATOR . $group .
DIRECTORY_SEPARATOR :
$this->_flush_dir;
Util_File::emptydir( $flush_dir, $this->_exclude );
}
return true;
}
/**
* Gets a key extension for "ahead generation" mode.
* Used by AlwaysCached functionality to regenerate content
*
* @param string $group Used to differentiate between groups of cache values.
*
* @return array
*/
public function get_ahead_generation_extension( $group ) {
return array(
'before_time' => time(),
);
}
/**
* Flushes group with before condition
*
* @param string $group Used to differentiate between groups of cache values.
* @param array $extension Used to set a condition what version to flush.
*
* @return void
*/
public function flush_group_after_ahead_generation( $group, $extension ) {
$dir = $this->_flush_dir;
$extension['before_time'];
}
/**
* Returns modification time of cache file
*
* @param integer $key
* @param string $group Used to differentiate between groups of cache values
* @return boolean|string
*/
function mtime( $key, $group = '' ) {
$path =
$this->_cache_dir . DIRECTORY_SEPARATOR . $this->_get_path( $key, $group );
if ( file_exists( $path ) ) {
return @filemtime( $path );
}
return false;
}
/**
* Returns file path for key
*
* @param string $key
* @return string
*/
function _get_path( $key, $group = '' ) {
if ( $this->_use_wp_hash && function_exists( 'wp_hash' ) )
$hash = wp_hash( $key );
else
$hash = md5( $key );
return ( $group ? $group . DIRECTORY_SEPARATOR : '' ) . sprintf( '%s/%s/%s.php', substr( $hash, 0, 3 ), substr( $hash, 3, 3 ), $hash );
}
public function get_stats_size( $timeout_time ) {
$size = array(
'bytes' => 0,
'items' => 0,
'timeout_occurred' => false
);
$size = $this->dirsize( $this->_cache_dir, $size, $timeout_time );
return $size;
}
private function dirsize( $path, $size, $timeout_time ) {
$dir = @opendir( $path );
if ( $dir ) {
while ( !$size['timeout_occurred'] && ( $entry = @readdir( $dir ) ) !== false ) {
if ( $entry == '.' || $entry == '..' ) {
continue;
}
$full_path = $path . DIRECTORY_SEPARATOR . $entry;
if ( @is_dir( $full_path ) ) {
$size = $this->dirsize( $full_path, $size, $timeout_time );
} else {
$size['bytes'] += @filesize( $full_path );
// dont check time() for each file, quite expensive
$size['items']++;
if ( $size['items'] % 1000 == 0 )
$size['timeout_occurred'] |= ( time() > $timeout_time );
}
}
@closedir( $dir );
}
return $size;
}
/**
* Used to replace as atomically as possible known value to new one
*/
public function set_if_maybe_equals( $key, $old_value, $new_value ) {
// cant guarantee atomic action here, filelocks fail often
$value = $this->get( $key );
if ( isset( $old_value['content'] ) &&
$value['content'] != $old_value['content'] )
return false;
return $this->set( $key, $new_value );
}
/**
* Use key as a counter and add integet value to it
*/
public function counter_add( $key, $value ) {
if ( $value == 0 )
return true;
$fp = $this->fopen_write( $key, '', 'a' );
if ( !$fp )
return false;
// use "x" to store increment, since it's most often case
// and it will save 50% of size if only increments are used
if ( $value == 1 )
@fputs( $fp, 'x' );
else
@fputs( $fp, ' ' . (int)$value );
@fclose( $fp );
return true;
}
/**
* Use key as a counter and add integet value to it
*/
public function counter_set( $key, $value ) {
$fp = $this->fopen_write( $key, '', 'wb' );
if ( !$fp )
return false;
$expire = W3TC_CACHE_FILE_EXPIRE_MAX;
$expires_at = time() + $expire;
@fputs( $fp, pack( 'L', $expires_at ) );
@fputs( $fp, '<?php exit; ?>' );
@fputs( $fp, (int)$value );
@fclose( $fp );
return true;
}
/**
* Get counter's value
*/
public function counter_get( $key ) {
list( $value, $old_data ) = $this->_get_with_old_raw( $key );
if ( empty( $value ) )
return 0;
$original_length = strlen( $value );
$cut_value = str_replace( 'x', '', $value );
$count = $original_length - strlen( $cut_value );
// values more than 1 are stored as <space>value
$a = explode( ' ', $cut_value );
foreach ( $a as $counter_value )
$count += (int)$counter_value;
return $count;
}
private function fopen_write( $key, $group, $mode ) {
$storage_key = $this->get_item_key( $key );
$sub_path = $this->_get_path( $storage_key, $group );
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . $sub_path;
$dir = dirname( $path );
if ( !@is_dir( $dir ) ) {
if ( !Util_File::mkdir_from( $dir, dirname( W3TC_CACHE_DIR ) ) )
return false;
}
$fp = @fopen( $path, $mode );
return $fp;
}
/**
* Flush cache based on regex
*
* @since 2.7.1
*
* @param string $regex
*/
private function _flush_based_on_regex( $regex ) {
if ( Util_Environment::is_wpmu() && ! Util_Environment::is_wpmu_subdomain() ) {
$domain = get_home_url();
$parsed = parse_url( $domain );
$host = $parsed['host'];
$path = isset( $parsed['path'] ) ? '/' . trim( $parsed['path'], '/' ) : '';
$flush_dir = W3TC_CACHE_PAGE_ENHANCED_DIR . DIRECTORY_SEPARATOR . $host . $path;
} else {
$flush_dir = W3TC_CACHE_PAGE_ENHANCED_DIR . DIRECTORY_SEPARATOR . Util_Environment::host();
}
$dir = @opendir( $flush_dir );
if ( $dir ) {
while ( ( $entry = @readdir( $dir ) ) !== false ) {
if ( '.' === $entry || '..' === $entry ) {
continue;
}
if ( preg_match( '~' . $regex . '~', basename( $entry ) ) ) {
Util_File::rmdir( $flush_dir . DIRECTORY_SEPARATOR . $entry );
}
}
@closedir( $dir );
}
}
}