273 lines
6.5 KiB
PHP
273 lines
6.5 KiB
PHP
<?php
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/**
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* File Storage engine for cache
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*
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs.cache
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* @since CakePHP(tm) v 1.2.0.4933
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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if (!class_exists('File')) {
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require LIBS . 'file.php';
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}
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/**
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* File Storage engine for cache
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*
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* @todo use the File and Folder classes (if it's not a too big performance hit)
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* @package cake
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* @subpackage cake.cake.libs.cache
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*/
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class FileEngine extends CacheEngine {
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/**
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* Instance of File class
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*
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* @var File
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* @access protected
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*/
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var $_File = null;
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/**
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* Settings
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*
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* - path = absolute path to cache directory, default => CACHE
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* - prefix = string prefix for filename, default => cake_
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* - lock = enable file locking on write, default => false
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* - serialize = serialize the data, default => true
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*
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* @var array
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* @see CacheEngine::__defaults
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* @access public
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*/
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var $settings = array();
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/**
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* True unless FileEngine::__active(); fails
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*
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* @var boolean
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* @access protected
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*/
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var $_init = true;
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/**
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* Initialize the Cache Engine
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*
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* Called automatically by the cache frontend
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* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
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*
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* @param array $setting array of setting for the engine
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* @return boolean True if the engine has been successfully initialized, false if not
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* @access public
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*/
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function init($settings = array()) {
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parent::init(array_merge(
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array(
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'engine' => 'File', 'path' => CACHE, 'prefix'=> 'cake_', 'lock'=> false,
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'serialize'=> true, 'isWindows' => false
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),
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$settings
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));
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if (!isset($this->_File)) {
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$this->_File =& new File($this->settings['path'] . DS . 'cake');
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}
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if (DIRECTORY_SEPARATOR === '\\') {
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$this->settings['isWindows'] = true;
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}
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$path = $this->_File->Folder->cd($this->settings['path']);
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if ($path) {
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$this->settings['path'] = $path;
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}
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return $this->__active();
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}
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/**
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* Garbage collection. Permanently remove all expired and deleted data
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*
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* @return boolean True if garbage collection was succesful, false on failure
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* @access public
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*/
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function gc() {
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return $this->clear(true);
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}
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/**
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* Write data for key into cache
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*
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* @param string $key Identifier for the data
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* @param mixed $data Data to be cached
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* @param mixed $duration How long to cache the data, in seconds
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* @return boolean True if the data was succesfully cached, false on failure
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* @access public
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*/
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function write($key, &$data, $duration) {
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if ($data === '' || !$this->_init) {
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return false;
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}
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if ($this->_setKey($key) === false) {
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return false;
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}
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$lineBreak = "\n";
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if ($this->settings['isWindows']) {
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$lineBreak = "\r\n";
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}
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if (!empty($this->settings['serialize'])) {
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if ($this->settings['isWindows']) {
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$data = str_replace('\\', '\\\\\\\\', serialize($data));
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} else {
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$data = serialize($data);
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}
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}
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if ($this->settings['lock']) {
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$this->_File->lock = true;
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}
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$expires = time() + $duration;
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$contents = $expires . $lineBreak . $data . $lineBreak;
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$success = $this->_File->write($contents);
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$this->_File->close();
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return $success;
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}
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/**
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* Read a key from the cache
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*
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* @param string $key Identifier for the data
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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* @access public
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*/
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function read($key) {
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if ($this->_setKey($key) === false || !$this->_init || !$this->_File->exists()) {
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return false;
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}
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if ($this->settings['lock']) {
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$this->_File->lock = true;
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}
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$time = time();
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$cachetime = intval($this->_File->read(11));
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if ($cachetime !== false && ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime)) {
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$this->_File->close();
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return false;
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}
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$data = $this->_File->read(true);
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if ($data !== '' && !empty($this->settings['serialize'])) {
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if ($this->settings['isWindows']) {
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$data = str_replace('\\\\\\\\', '\\', $data);
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}
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$data = unserialize((string)$data);
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}
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$this->_File->close();
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return $data;
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}
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/**
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* Delete a key from the cache
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*
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* @param string $key Identifier for the data
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* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
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* @access public
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*/
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function delete($key) {
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if ($this->_setKey($key) === false || !$this->_init) {
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return false;
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}
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return $this->_File->delete();
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}
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/**
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* Delete all values from the cache
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*
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* @param boolean $check Optional - only delete expired cache items
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* @return boolean True if the cache was succesfully cleared, false otherwise
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* @access public
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*/
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function clear($check) {
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if (!$this->_init) {
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return false;
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}
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$dir = dir($this->settings['path']);
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if ($check) {
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$now = time();
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$threshold = $now - $this->settings['duration'];
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}
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$prefixLength = strlen($this->settings['prefix']);
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while (($entry = $dir->read()) !== false) {
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if (substr($entry, 0, $prefixLength) !== $this->settings['prefix']) {
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continue;
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}
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if ($this->_setKey($entry) === false) {
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continue;
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}
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if ($check) {
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$mtime = $this->_File->lastChange();
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if ($mtime === false || $mtime > $threshold) {
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continue;
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}
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$expires = $this->_File->read(11);
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$this->_File->close();
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if ($expires > $now) {
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continue;
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}
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}
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$this->_File->delete();
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}
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$dir->close();
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return true;
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}
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/**
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* Get absolute file for a given key
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*
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* @param string $key The key
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* @return mixed Absolute cache file for the given key or false if erroneous
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* @access private
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*/
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function _setKey($key) {
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$this->_File->Folder->cd($this->settings['path']);
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if ($key !== $this->_File->name) {
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$this->_File->name = $key;
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$this->_File->path = null;
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}
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if (!$this->_File->Folder->inPath($this->_File->pwd(), true)) {
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return false;
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}
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}
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/**
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* Determine is cache directory is writable
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*
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* @return boolean
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* @access private
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*/
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function __active() {
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if ($this->_init && !is_writable($this->settings['path'])) {
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$this->_init = false;
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trigger_error(sprintf(__('%s is not writable', true), $this->settings['path']), E_USER_WARNING);
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return false;
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}
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return true;
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}
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}
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