Viewing file:  File.php (8.17 KB) -rw-rw-rw-
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<?php
/**
* File class
*/
if (!defined('W3TC')) {
die();
}
define('W3TC_CACHE_FILE_EXPIRE_MAX', 2592000);
w3_require_once(W3TC_INC_DIR . '/functions/file.php');
w3_require_once(W3TC_LIB_W3_DIR . '/Cache/Base.php');
/**
* Class W3_Cache_File
*/
class W3_Cache_File extends W3_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
$this->_cache_dir = w3_cache_blog_dir($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) {
// clear whole section if we operate on master cache
$this->_flush_dir = w3_cache_dir($config['section']);
} else
$this->_flush_dir = $this->_cache_dir;
}
if (isset($config['use_wp_hash']) && $config['use_wp_hash'] && function_exists('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 = '') {
$key = $this->get_item_key($key);
$sub_path = $this->_get_path($key);
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . ($group ? $group . DIRECTORY_SEPARATOR : '') . $sub_path;
$dir = dirname($path);
if (!@is_dir($dir)) {
if (!w3_mkdir_from($dir, W3TC_CACHE_DIR))
return false;
}
$fp = @fopen($path, '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 = '') {
$has_old_data = false;
$key = $this->get_item_key($key);
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . ($group ? $group . DIRECTORY_SEPARATOR : '') . $this->_get_path($key);
if (!is_readable($path))
return array(null, $has_old_data);
$fp = @fopen($path, 'rb');
if (!$fp)
return array(null, $has_old_data);
if ($this->_locking)
@flock($fp, LOCK_SH);
$expires_at = @fread($fp, 4);
$data_unserialized = null;
if ($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);
$data_unserialized = @unserialize($data);
}
}
if ($this->_locking)
@flock($fp, LOCK_UN);
@fclose($fp);
return array($data_unserialized, $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 = '') {
$key = $this->get_item_key($key);
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . ($group ? $group . DIRECTORY_SEPARATOR : '') . $this->_get_path($key);
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);
}
/**
* Key to delete, deletes .old and primary if exists.
* @param string $key
*
* @return bool
*/
function hard_delete($key) {
$key = $this->get_item_key($key);
$path = $this->_cache_dir . DIRECTORY_SEPARATOR . $this->_get_path($key);
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);
$flush_dir = $group ? $this->_cache_dir . DIRECTORY_SEPARATOR . $group . DIRECTORY_SEPARATOR : $this->_flush_dir;
w3_emptydir($flush_dir, $this->_exclude);
return true;
}
/**
* 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 = $this->_cache_dir . DIRECTORY_SEPARATOR . ($group ? $group . DIRECTORY_SEPARATOR : '') . $this->_get_path($key);
if (file_exists($path)) {
return @filemtime($path);
}
return false;
}
/**
* Returns file path for key
*
* @param string $key
* @return string
*/
function _get_path($key) {
if ($this->_use_wp_hash)
$hash = wp_hash($key);
else
$hash = md5($key);
$path = sprintf('%s/%s/%s.php', substr($hash, 0, 3), substr($hash, 3, 3), $hash);
return $path;
}
}
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