<?php
/**
* This file is part of the PHP Video Toolkit v2 package.
*
* @author Oliver Lillie (aka buggedcom) <publicmail@buggedcom.co.uk>
* @license Dual licensed under MIT and GPLv2
* @copyright Copyright (c) 2008-2014 Oliver Lillie <http://www.buggedcom.co.uk>
* @package PHPVideoToolkit V2
* @version 2.1.7-beta
* @uses ffmpeg http://ffmpeg.sourceforge.net/
*/
namespace PHPVideoToolkit;
/**
* PHPVideoToolkit's caching driver for storing the cache inside the specified temp directory.
*
* @author Oliver Lillie
*/
class Cache_InTempDirectory extends CacheAbstract
{
/**
* Determines if this caching driver is available on the current system.
*
* @access public
* @author Oliver Lillie
* @return boolean Returns true if the driver is available, false otherwise.
*/
public function isAvailable()
{
$dir = $this->_config->temp_directory;
if(is_dir($dir) === false)
{
return false;
}
if(is_writable($dir) === false)
{
return false;
}
$cache_dir = $dir.'/'.$this->_key_prefix.'_cache';
if(is_dir($cache_dir) === false && mkdir($cache_dir, 0770) === false)
{
return false;
}
return true;
}
/**
* Creates the file path prefix for a cache file based off the given key.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return string Returns the generated file path prefix.
*/
protected function _getFilePathPrefix($key)
{
$dir = $this->_config->temp_directory;
return $dir.'/'.$this->_key_prefix.'_cache/'.md5($key).'_';
}
/**
* Returns the file path for the given key. Returning the most recent version and clearing old cache keys.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return string Returns the found file path for the given cache key.
*/
protected function _getFile($key)
{
$file_prefix = $this->_getFilePathPrefix($key);
$matches = glob($file_prefix.'*');
if(empty($matches) === false)
{
natsort($matches);
$cur_time = time();
$oldest = 0;
foreach ($matches as $path)
{
$name = basename($path);
$parts = explode('_', $name);
if($parts[1] < $cur_time)
{
@unlink($path);
}
else if($parts[1] > $oldest)
{
$oldest = $parts[1];
}
}
if($oldest > 0)
{
return $file_prefix.$oldest;
}
}
return null;
}
/**
* Returns the unserialized contents for the given cache key if the file exists.
* Otherwise returns null.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return mixed Returns null if the key does not exist, otherwise returns a mixed value depending on what has been stored.
*/
protected function _get($key)
{
$file = $this->_getFile($key);
if(is_file($file) === true)
{
$data = file_get_contents($file);
return unserialize($data);
}
return null;
}
/**
* Determines if the cache for the given key exists.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return boolean Returns true if the key cache exists, otherwise false.
*/
protected function _isMiss($key)
{
return !is_file($this->_getFile($key));
}
/**
* Sets data to the given cache key with an optional expiration date.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @param mixed $value The data to be stored by the cache driver.
* @param mixed $expiration Integer timestamp if the data is too expire, otherwise null as the cache defaults to expire in 1 hour.
* @return boolean Returns true if the cache was saved to file.
*/
protected function _set($key, $value, $expiration=null)
{
if($expiration === null)
{
$expiration = 3600;
}
$file = $this->_getFilePathPrefix($key).(time()+$expiration);
$result = file_put_contents($file, serialize($value), LOCK_EX);
@chmod($filename, 0660);
return $result;
}
}
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