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<?php
w3_require_once(W3TC_INC_DIR . '/functions/file.php');
/**
* Class Minify_Cache_File
* @package Minify
*/
class Minify_Cache_File {
public function __construct($path = '', $exclude = array(), $locking = false, $flushTimeLimit = 0, $flush_path = null) {
if (!$path) {
w3_require_once(W3TC_LIB_MINIFY_DIR . '/Solar/Dir.php');
$path = rtrim(Solar_Dir::tmp(), DIRECTORY_SEPARATOR);
}
$this->_path = $path;
$this->_exclude = $exclude;
$this->_locking = $locking;
$this->_flushTimeLimit = $flushTimeLimit;
$this->_flush_path = (is_null($flush_path) ? $path : $flush_path);
if (!file_exists($this->_path .'/index.html')) {
if (!is_dir($this->_path))
w3_mkdir_from($this->_path, W3TC_CACHE_DIR);
@file_put_contents($this->_path .'/index.html', '');
}
}
/**
* Write data to cache.
*
* @param string $id cache id (e.g. a filename)
*
* @param string $data
*
* @return bool success
*/
public function store($id, $data) {
$path = $this->_path . '/' . $id;
$flag = $this->_locking ? LOCK_EX : null;
if (is_file($path)) {
@unlink($path);
}
if (!@file_put_contents($path, $data, $flag)) {
// retry with make dir
w3_mkdir_from(dirname($path), W3TC_CACHE_DIR);
if (!@file_put_contents($path, $data, $flag))
return false;
if (is_file($path . '.old')) {
@unlink($path . '.old');
}
@file_put_contents($path . '.old', $data, $flag);
}
// write control
if ($data != $this->fetch($id)) {
@unlink($path);
return false;
}
return true;
}
/**
* Get the size of a cache entry
*
* @param string $id cache id (e.g. a filename)
*
* @return int size in bytes
*/
public function getSize($id) {
$path = $this->_path . '/' . $id;
return filesize($path);
}
/**
* Does a valid cache entry exist?
*
* @param string $id cache id (e.g. a filename)
*
* @param int $srcMtime mtime of the original source file(s)
*
* @return bool exists
*/
public function isValid($id, $srcMtime) {
$path = $this->_path . '/' . $id;
return (is_file($path) && (filemtime($path) >= $srcMtime));
}
/**
* Send the cached content to output
*
* @param string $id cache id (e.g. a filename)
* @return bool
*/
public function display($id) {
$path = $this->_path . '/' . $id;
$fp = @fopen($path, 'rb');
if ($fp) {
if ($this->_locking)
@flock($fp, LOCK_SH);
@fpassthru($fp);
if ($this->_locking)
@flock($fp, LOCK_UN);
@fclose($fp);
return true;
}
return false;
}
/**
* Fetch the cached content
*
* @param string $id cache id (e.g. a filename)
*
* @return string
*/
public function fetch($id) {
$path = $this->_path . '/' . $id;
if (is_readable($path)) {
if ($this->_locking) {
$fp = @fopen($path, 'rb');
if ($fp) {
@flock($fp, LOCK_SH);
$ret = @stream_get_contents($fp);
@flock($fp, LOCK_UN);
@fclose($fp);
return $ret;
}
} else {
return @file_get_contents($path);
}
} else {
$path_old = $path . '.old';
$too_old_time = time() - 30;
$file_time = @filemtime($path_old);
if ($file_time) {
if ($file_time > $too_old_time) {
// return old data
return @file_get_contents($path_old);
}
@touch($path_old);
}
}
return false;
}
/**
* Flush cache
*
* @return bool
*/
public function flush() {
@set_time_limit($this->_flushTimeLimit);
return w3_emptydir($this->_flush_path, $this->_exclude);
}
/**
* Fetch the cache path used
*
* @return string
*/
public function getPath() {
return $this->_path;
}
private $_path = null;
private $_exclude = null;
private $_locking = null;
private $_flushTimeLimit = null;
}
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