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<?php
/**
* File Storage engine for cache. Filestorage is the slowest cache storage
* to read and write. However, it is good for servers that don't have other storage
* engine available, or have content which is not performance sensitive.
*
* You can configure a FileEngine cache, using Cache::config()
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 1.2.0.4933
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
/**
* File Storage engine for cache. Filestorage is the slowest cache storage
* to read and write. However, it is good for servers that don't have other storage
* engine available, or have content which is not performance sensitive.
*
* You can configure a FileEngine cache, using Cache::config()
*
* @package Cake.Cache.Engine
*/
class FileEngine extends CacheEngine {
/**
* Instance of SplFileObject class
*
* @var File
*/
protected $_File = null;
/**
* Settings
*
* - path = absolute path to cache directory, default => CACHE
* - prefix = string prefix for filename, default => cake_
* - lock = enable file locking on write, default => false
* - serialize = serialize the data, default => true
*
* @var array
* @see CacheEngine::__defaults
*/
public $settings = array();
/**
* True unless FileEngine::__active(); fails
*
* @var boolean
*/
protected $_init = true;
/**
* Initialize the Cache Engine
*
* Called automatically by the cache frontend
* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
*
* @param array $settings array of setting for the engine
* @return boolean True if the engine has been successfully initialized, false if not
*/
public function init($settings = array()) {
$settings += array(
'engine' => 'File',
'path' => CACHE,
'prefix' => 'cake_',
'lock' => true,
'serialize' => true,
'isWindows' => false,
'mask' => 0664
);
parent::init($settings);
if (DS === '\\') {
$this->settings['isWindows'] = true;
}
if (substr($this->settings['path'], -1) !== DS) {
$this->settings['path'] .= DS;
}
if (!empty($this->_groupPrefix)) {
$this->_groupPrefix = str_replace('_', DS, $this->_groupPrefix);
}
return $this->_active();
}
/**
* Garbage collection. Permanently remove all expired and deleted data
*
* @param integer $expires [optional] An expires timestamp, invalidating all data before.
* @return boolean True if garbage collection was successful, false on failure
*/
public function gc($expires = null) {
return $this->clear(true);
}
/**
* Write data for key into cache
*
* @param string $key Identifier for the data
* @param mixed $data Data to be cached
* @param integer $duration How long to cache the data, in seconds
* @return boolean True if the data was successfully cached, false on failure
*/
public function write($key, $data, $duration) {
if ($data === '' || !$this->_init) {
return false;
}
if ($this->_setKey($key, true) === false) {
return false;
}
$lineBreak = "\n";
if ($this->settings['isWindows']) {
$lineBreak = "\r\n";
}
if (!empty($this->settings['serialize'])) {
if ($this->settings['isWindows']) {
$data = str_replace('\\', '\\\\\\\\', serialize($data));
} else {
$data = serialize($data);
}
}
$expires = time() + $duration;
$contents = $expires . $lineBreak . $data . $lineBreak;
if ($this->settings['lock']) {
$this->_File->flock(LOCK_EX);
}
$this->_File->rewind();
$success = $this->_File->ftruncate(0) && $this->_File->fwrite($contents) && $this->_File->fflush();
if ($this->settings['lock']) {
$this->_File->flock(LOCK_UN);
}
return $success;
}
/**
* Read a key from the cache
*
* @param string $key Identifier for the data
* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
*/
public function read($key) {
if (!$this->_init || $this->_setKey($key) === false) {
return false;
}
if ($this->settings['lock']) {
$this->_File->flock(LOCK_SH);
}
$this->_File->rewind();
$time = time();
$cachetime = intval($this->_File->current());
if ($cachetime !== false && ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime)) {
if ($this->settings['lock']) {
$this->_File->flock(LOCK_UN);
}
return false;
}
$data = '';
$this->_File->next();
while ($this->_File->valid()) {
$data .= $this->_File->current();
$this->_File->next();
}
if ($this->settings['lock']) {
$this->_File->flock(LOCK_UN);
}
$data = trim($data);
if ($data !== '' && !empty($this->settings['serialize'])) {
if ($this->settings['isWindows']) {
$data = str_replace('\\\\\\\\', '\\', $data);
}
$data = unserialize((string)$data);
}
return $data;
}
/**
* Delete a key from the cache
*
* @param string $key Identifier for the data
* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
*/
public function delete($key) {
if ($this->_setKey($key) === false || !$this->_init) {
return false;
}
$path = $this->_File->getRealPath();
$this->_File = null;
return @unlink($path);
}
/**
* Delete all values from the cache
*
* @param boolean $check Optional - only delete expired cache items
* @return boolean True if the cache was successfully cleared, false otherwise
*/
public function clear($check) {
if (!$this->_init) {
return false;
}
$this->_File = null;
$threshold = $now = false;
if ($check) {
$now = time();
$threshold = $now - $this->settings['duration'];
}
$this->_clearDirectory($this->settings['path'], $now, $threshold);
$directory = new RecursiveDirectoryIterator($this->settings['path']);
$contents = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::SELF_FIRST);
$cleared = array();
foreach ($contents as $path) {
if ($path->isFile()) {
continue;
}
$path = $path->getRealPath() . DS;
if (!in_array($path, $cleared)) {
$this->_clearDirectory($path, $now, $threshold);
$cleared[] = $path;
}
}
return true;
}
/**
* Used to clear a directory of matching files.
*
* @param string $path The path to search.
* @param integer $now The current timestamp
* @param integer $threshold Any file not modified after this value will be deleted.
* @return void
*/
protected function _clearDirectory($path, $now, $threshold) {
$prefixLength = strlen($this->settings['prefix']);
if (!is_dir($path)) {
return;
}
$dir = dir($path);
while (($entry = $dir->read()) !== false) {
if (substr($entry, 0, $prefixLength) !== $this->settings['prefix']) {
continue;
}
$filePath = $path . $entry;
if (!file_exists($filePath) || is_dir($filePath)) {
continue;
}
$file = new SplFileObject($path . $entry, 'r');
if ($threshold) {
$mtime = $file->getMTime();
if ($mtime > $threshold) {
continue;
}
$expires = (int)$file->current();
if ($expires > $now) {
continue;
}
}
if ($file->isFile()) {
$_path = $file->getRealPath();
$file = null;
@unlink($_path);
}
}
}
/**
* Not implemented
*
* @param string $key
* @param integer $offset
* @return void
* @throws CacheException
*/
public function decrement($key, $offset = 1) {
throw new CacheException(__d('cake_dev', 'Files cannot be atomically decremented.'));
}
/**
* Not implemented
*
* @param string $key
* @param integer $offset
* @return void
* @throws CacheException
*/
public function increment($key, $offset = 1) {
throw new CacheException(__d('cake_dev', 'Files cannot be atomically incremented.'));
}
/**
* Sets the current cache key this class is managing, and creates a writable SplFileObject
* for the cache file the key is referring to.
*
* @param string $key The key
* @param boolean $createKey Whether the key should be created if it doesn't exists, or not
* @return boolean true if the cache key could be set, false otherwise
*/
protected function _setKey($key, $createKey = false) {
$groups = null;
if (!empty($this->_groupPrefix)) {
$groups = vsprintf($this->_groupPrefix, $this->groups());
}
$dir = $this->settings['path'] . $groups;
if (!is_dir($dir)) {
mkdir($dir, 0775, true);
}
$path = new SplFileInfo($dir . $key);
if (!$createKey && !$path->isFile()) {
return false;
}
if (empty($this->_File) || $this->_File->getBaseName() !== $key) {
$exists = file_exists($path->getPathname());
try {
$this->_File = $path->openFile('c+');
} catch (Exception $e) {
trigger_error($e->getMessage(), E_USER_WARNING);
return false;
}
unset($path);
if (!$exists && !chmod($this->_File->getPathname(), (int)$this->settings['mask'])) {
trigger_error(__d(
'cake_dev', 'Could not apply permission mask "%s" on cache file "%s"',
array($this->_File->getPathname(), $this->settings['mask'])), E_USER_WARNING);
}
}
return true;
}
/**
* Determine is cache directory is writable
*
* @return boolean
*/
protected function _active() {
$dir = new SplFileInfo($this->settings['path']);
if (Configure::read('debug')) {
$path = $dir->getPathname();
if (!is_dir($path)) {
mkdir($path, 0775, true);
}
}
if ($this->_init && !($dir->isDir() && $dir->isWritable())) {
$this->_init = false;
trigger_error(__d('cake_dev', '%s is not writable', $this->settings['path']), E_USER_WARNING);
return false;
}
return true;
}
/**
* Generates a safe key for use with cache engine storage engines.
*
* @param string $key the key passed over
* @return mixed string $key or false
*/
public function key($key) {
if (empty($key)) {
return false;
}
$key = Inflector::underscore(str_replace(array(DS, '/', '.', '<', '>', '?', ':', '|', '*', '"'), '_', strval($key)));
return $key;
}
/**
* Recursively deletes all files under any directory named as $group
*
* @return boolean success
*/
public function clearGroup($group) {
$this->_File = null;
$directoryIterator = new RecursiveDirectoryIterator($this->settings['path']);
$contents = new RecursiveIteratorIterator($directoryIterator, RecursiveIteratorIterator::CHILD_FIRST);
foreach ($contents as $object) {
$containsGroup = strpos($object->getPathName(), DS . $group . DS) !== false;
$hasPrefix = strpos($object->getBaseName(), $this->settings['prefix']) === 0;
if ($object->isFile() && $containsGroup && $hasPrefix) {
@unlink($object->getPathName());
}
}
return true;
}
}
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