431 lines
11 KiB
PHP
431 lines
11 KiB
PHP
<?php
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/**
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* File Storage engine for cache. Filestorage is the slowest cache storage
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* to read and write. However, it is good for servers that don't have other storage
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* engine available, or have content which is not performance sensitive.
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*
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* You can configure a FileEngine cache, using Cache::config()
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @since CakePHP(tm) v 1.2.0.4933
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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/**
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* File Storage engine for cache. Filestorage is the slowest cache storage
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* to read and write. However, it is good for servers that don't have other storage
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* engine available, or have content which is not performance sensitive.
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*
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* You can configure a FileEngine cache, using Cache::config()
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*
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* @package Cake.Cache.Engine
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*/
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class FileEngine extends CacheEngine {
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/**
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* Instance of SplFileObject class
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*
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* @var File
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*/
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protected $_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 => true
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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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*/
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public $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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*/
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protected $_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 $settings array of setting for the engine
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* @return boolean True if the engine has been successfully initialized, false if not
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*/
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public function init($settings = array()) {
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$settings += array(
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'engine' => 'File',
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'path' => CACHE,
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'prefix' => 'cake_',
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'lock' => true,
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'serialize' => true,
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'isWindows' => false,
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'mask' => 0664
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);
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parent::init($settings);
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if (DS === '\\') {
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$this->settings['isWindows'] = true;
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}
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if (substr($this->settings['path'], -1) !== DS) {
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$this->settings['path'] .= DS;
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}
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if (!empty($this->_groupPrefix)) {
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$this->_groupPrefix = str_replace('_', DS, $this->_groupPrefix);
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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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* @param integer $expires [optional] An expires timestamp, invalidating all data before.
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* @return boolean True if garbage collection was successful, false on failure
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*/
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public function gc($expires = null) {
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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 integer $duration How long to cache the data, in seconds
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* @return boolean True if the data was successfully cached, false on failure
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*/
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public function write($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($key, true) === false) {
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return false;
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}
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$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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$expires = time() + $duration;
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$contents = $expires . $lineBreak . $data . $lineBreak;
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if ($this->settings['lock']) {
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$this->_File->flock(LOCK_EX);
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}
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$this->_File->rewind();
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$success = $this->_File->ftruncate(0) && $this->_File->fwrite($contents) && $this->_File->fflush();
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if ($this->settings['lock']) {
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$this->_File->flock(LOCK_UN);
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}
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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 $key Identifier for the data
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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*/
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public function read($key) {
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if (!$this->_init || $this->_setKey($key) === false) {
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return false;
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}
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if ($this->settings['lock']) {
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$this->_File->flock(LOCK_SH);
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}
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$this->_File->rewind();
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$time = time();
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$cachetime = intval($this->_File->current());
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if ($cachetime !== false && ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime)) {
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if ($this->settings['lock']) {
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$this->_File->flock(LOCK_UN);
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}
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return false;
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}
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$data = '';
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$this->_File->next();
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while ($this->_File->valid()) {
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$data .= $this->_File->current();
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$this->_File->next();
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}
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if ($this->settings['lock']) {
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$this->_File->flock(LOCK_UN);
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}
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$data = trim($data);
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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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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 $key Identifier for the data
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* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
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*/
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public function delete($key) {
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if ($this->_setKey($key) === false || !$this->_init) {
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return false;
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}
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$path = $this->_File->getRealPath();
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$this->_File = null;
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//@codingStandardsIgnoreStart
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return @unlink($path);
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//@codingStandardsIgnoreEnd
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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 $check Optional - only delete expired cache items
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* @return boolean True if the cache was successfully cleared, false otherwise
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*/
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public function clear($check) {
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if (!$this->_init) {
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return false;
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}
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$this->_File = null;
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$threshold = $now = false;
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if ($check) {
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$now = time();
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$threshold = $now - $this->settings['duration'];
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}
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$this->_clearDirectory($this->settings['path'], $now, $threshold);
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$directory = new RecursiveDirectoryIterator($this->settings['path']);
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$contents = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);
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$cleared = array();
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foreach ($contents as $path) {
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if ($path->isFile()) {
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continue;
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}
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$path = $path->getRealPath() . DS;
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if (!in_array($path, $cleared)) {
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$this->_clearDirectory($path, $now, $threshold);
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$cleared[] = $path;
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}
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}
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return true;
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}
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/**
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* Used to clear a directory of matching files.
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*
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* @param string $path The path to search.
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* @param integer $now The current timestamp
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* @param integer $threshold Any file not modified after this value will be deleted.
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* @return void
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*/
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protected function _clearDirectory($path, $now, $threshold) {
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$prefixLength = strlen($this->settings['prefix']);
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if (!is_dir($path)) {
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return;
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}
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$dir = dir($path);
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while (($entry = $dir->read()) !== false) {
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if (substr($entry, 0, $prefixLength) !== $this->settings['prefix']) {
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continue;
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}
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$filePath = $path . $entry;
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if (!file_exists($filePath) || is_dir($filePath)) {
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continue;
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}
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$file = new SplFileObject($path . $entry, 'r');
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if ($threshold) {
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$mtime = $file->getMTime();
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if ($mtime > $threshold) {
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continue;
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}
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$expires = (int)$file->current();
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if ($expires > $now) {
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continue;
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}
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}
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if ($file->isFile()) {
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$filePath = $file->getRealPath();
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$file = null;
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//@codingStandardsIgnoreStart
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@unlink($filePath);
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//@codingStandardsIgnoreEnd
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}
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}
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}
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/**
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* Not implemented
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*
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* @param string $key
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* @param integer $offset
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* @return void
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* @throws CacheException
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*/
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public function decrement($key, $offset = 1) {
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throw new CacheException(__d('cake_dev', 'Files cannot be atomically decremented.'));
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}
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/**
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* Not implemented
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*
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* @param string $key
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* @param integer $offset
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* @return void
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* @throws CacheException
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*/
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public function increment($key, $offset = 1) {
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throw new CacheException(__d('cake_dev', 'Files cannot be atomically incremented.'));
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}
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/**
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* Sets the current cache key this class is managing, and creates a writable SplFileObject
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* for the cache file the key is referring to.
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*
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* @param string $key The key
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* @param boolean $createKey Whether the key should be created if it doesn't exists, or not
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* @return boolean true if the cache key could be set, false otherwise
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*/
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protected function _setKey($key, $createKey = false) {
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$groups = null;
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if (!empty($this->_groupPrefix)) {
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$groups = vsprintf($this->_groupPrefix, $this->groups());
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}
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$dir = $this->settings['path'] . $groups;
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if (!is_dir($dir)) {
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mkdir($dir, 0775, true);
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}
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$path = new SplFileInfo($dir . $key);
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if (!$createKey && !$path->isFile()) {
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return false;
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}
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if (empty($this->_File) || $this->_File->getBaseName() !== $key) {
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$exists = file_exists($path->getPathname());
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try {
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$this->_File = $path->openFile('c+');
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} catch (Exception $e) {
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trigger_error($e->getMessage(), E_USER_WARNING);
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return false;
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}
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unset($path);
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if (!$exists && !chmod($this->_File->getPathname(), (int)$this->settings['mask'])) {
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trigger_error(__d(
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'cake_dev', 'Could not apply permission mask "%s" on cache file "%s"',
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array($this->_File->getPathname(), $this->settings['mask'])), E_USER_WARNING);
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}
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}
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return true;
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}
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/**
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* Determine is cache directory is writable
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*
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* @return boolean
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*/
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protected function _active() {
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$dir = new SplFileInfo($this->settings['path']);
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if (Configure::read('debug')) {
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$path = $dir->getPathname();
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if (!is_dir($path)) {
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mkdir($path, 0775, true);
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}
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}
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if ($this->_init && !($dir->isDir() && $dir->isWritable())) {
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$this->_init = false;
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trigger_error(__d('cake_dev', '%s is not writable', $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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* Generates a safe key for use with cache engine storage engines.
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*
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* @param string $key the key passed over
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* @return mixed string $key or false
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*/
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public function key($key) {
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if (empty($key)) {
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return false;
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}
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$key = Inflector::underscore(str_replace(array(DS, '/', '.', '<', '>', '?', ':', '|', '*', '"'), '_', strval($key)));
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return $key;
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}
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/**
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* Recursively deletes all files under any directory named as $group
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*
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* @return boolean success
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*/
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public function clearGroup($group) {
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$this->_File = null;
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$directoryIterator = new RecursiveDirectoryIterator($this->settings['path']);
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$contents = new RecursiveIteratorIterator($directoryIterator, RecursiveIteratorIterator::CHILD_FIRST);
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foreach ($contents as $object) {
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$containsGroup = strpos($object->getPathName(), DS . $group . DS) !== false;
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$hasPrefix = true;
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if (strlen($this->settings['prefix']) !== 0) {
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$hasPrefix = strpos($object->getBaseName(), $this->settings['prefix']) === 0;
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}
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if ($object->isFile() && $containsGroup && $hasPrefix) {
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$path = $object->getPathName();
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$object = null;
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//@codingStandardsIgnoreStart
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@unlink($path);
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//@codingStandardsIgnoreEnd
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}
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}
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return true;
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}
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}
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