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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2016, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 2.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* CodeIgniter File Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author EllisLab Dev Team
* @link
*/
class CI_Cache_file extends CI_Driver {
/**
* Directory in which to save cache files
*
* @var string
*/
protected $_cache_path;
/**
* Initialize file-based cache
*
* @return void
*/
public function __construct()
{
$CI =& get_instance();
$CI->load->helper('file');
$path = $CI->config->item('cache_path');
$this->_cache_path = ($path === '') ? APPPATH.'cache/' : $path;
}
// ------------------------------------------------------------------------
/**
* Fetch from cache
*
* @param string $id Cache ID
* @return mixed Data on success, FALSE on failure
*/
public function get($id)
{
$data = $this->_get($id);
return is_array($data) ? $data['data'] : FALSE;
}
// ------------------------------------------------------------------------
/**
* Save into cache
*
* @param string $id Cache ID
* @param mixed $data Data to store
* @param int $ttl Time to live in seconds
* @param bool $raw Whether to store the raw value (unused)
* @return bool TRUE on success, FALSE on failure
*/
public function save($id, $data, $ttl = 60, $raw = FALSE)
{
$contents = array(
'time' => time(),
'ttl' => $ttl,
'data' => $data
);
if (write_file($this->_cache_path.$id, serialize($contents)))
{
chmod($this->_cache_path.$id, 0640);
return TRUE;
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed unique identifier of item in cache
* @return bool true on success/false on failure
*/
public function delete($id)
{
return file_exists($this->_cache_path.$id) ? unlink($this->_cache_path.$id) : FALSE;
}
// ------------------------------------------------------------------------
/**
* Increment a raw value
*
* @param string $id Cache ID
* @param int $offset Step/value to add
* @return New value on success, FALSE on failure
*/
public function increment($id, $offset = 1)
{
$data = $this->_get($id);
if ($data === FALSE)
{
$data = array('data' => 0, 'ttl' => 60);
}
elseif ( ! is_int($data['data']))
{
return FALSE;
}
$new_value = $data['data'] + $offset;
return $this->save($id, $new_value, $data['ttl'])
? $new_value
: FALSE;
}
// ------------------------------------------------------------------------
/**
* Decrement a raw value
*
* @param string $id Cache ID
* @param int $offset Step/value to reduce by
* @return New value on success, FALSE on failure
*/
public function decrement($id, $offset = 1)
{
$data = $this->_get($id);
if ($data === FALSE)
{
$data = array('data' => 0, 'ttl' => 60);
}
elseif ( ! is_int($data['data']))
{
return FALSE;
}
$new_value = $data['data'] - $offset;
return $this->save($id, $new_value, $data['ttl'])
? $new_value
: FALSE;
}
// ------------------------------------------------------------------------
/**
* Clean the Cache
*
* @return bool false on failure/true on success
*/
public function clean()
{
return delete_files($this->_cache_path, FALSE, TRUE);
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* Not supported by file-based caching
*
* @param string user/filehits
* @return mixed FALSE
*/
public function cache_info($type = NULL)
{
return get_dir_file_info($this->_cache_path);
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed key to get cache metadata on
* @return mixed FALSE on failure, array on success.
*/
public function get_metadata($id)
{
if ( ! file_exists($this->_cache_path.$id))
{
return FALSE;
}
$data = unserialize(file_get_contents($this->_cache_path.$id));
if (is_array($data))
{
$mtime = filemtime($this->_cache_path.$id);
if ( ! isset($data['ttl']))
{
return FALSE;
}
return array(
'expire' => $mtime + $data['ttl'],
'mtime' => $mtime
);
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Is supported
*
* In the file driver, check to see that the cache directory is indeed writable
*
* @return bool
*/
public function is_supported()
{
return is_really_writable($this->_cache_path);
}
// ------------------------------------------------------------------------
/**
* Get all data
*
* Internal method to get all the relevant data about a cache item
*
* @param string $id Cache ID
* @return mixed Data array on success or FALSE on failure
*/
protected function _get($id)
{
if ( ! is_file($this->_cache_path.$id))
{
return FALSE;
}
$data = unserialize(file_get_contents($this->_cache_path.$id));
if ($data['ttl'] > 0 && time() > $data['time'] + $data['ttl'])
{
unlink($this->_cache_path.$id);
return FALSE;
}
return $data;
}
}