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<?php

/**

* CodeIgniter

*

* An open source application development framework for PHP 5.2.4 or newer

*

* NOTICE OF LICENSE

*

* Licensed under the Open Software License version 3.0

*

* This source file is subject to the Open Software License (OSL 3.0) that is

* bundled with this package in the files license.txt / license.rst. It is

* also available through the world wide web at this URL:

* http://opensource.org/licenses/OSL-3.0

* If you did not receive a copy of the license and are unable to obtain it

* through the world wide web, please send an email to

* licensing@ellislab.com so we can send you a copy immediately.

*

* @package CodeIgniter

* @author EllisLab Dev Team

* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)

* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)

* @link http://codeigniter.com

* @since Version 1.0

* @filesource

*/

defined('BASEPATH') OR exit('No direct script access allowed');

/**

* Database Cache Class

*

* @category Database

* @author EllisLab Dev Team

* @link http://codeigniter.com/user_guide/database/

*/

class CI_DB_Cache {

/**

* CI Singleton

*

* @var object

*/

public $CI;

/**

* Database object

*

* Allows passing of DB object so that multiple database connections

* and returned DB objects can be supported.

*

* @var object

*/

public $db;

// --------------------------------------------------------------------

/**

* Constructor

*

* @param object &$db

* @return void

*/

public function __construct(&$db)

{

// Assign the main CI object to $this->CI and load the file helper since we use it a lot

$this->CI =& get_instance();

$this->db =& $db;

$this->CI->load->helper('file');

$this->check_path();

}

// --------------------------------------------------------------------

/**

* Set Cache Directory Path

*

* @param string $path Path to the cache directory

* @return bool

*/

public function check_path($path = '')

{

if ($path === '')

{

if ($this->db->cachedir === '')

{

return $this->db->cache_off();

}

$path = $this->db->cachedir;

}

// Add a trailing slash to the path if needed

$path = realpath($path)

? rtrim(realpath($path), DIRECTORY_SEPARATOR).DIRECTORY_SEPARATOR

: rtrim($path, '/').'/';

if ( ! is_dir($path))

{

log_message('debug', 'DB cache path error: '.$path);

// If the path is wrong we'll turn off caching

return $this->db->cache_off();

}

if ( ! is_really_writable($path))

{

log_message('debug', 'DB cache dir not writable: '.$path);

// If the path is not really writable we'll turn off caching

return $this->db->cache_off();

}

$this->db->cachedir = $path;

return TRUE;

}

// --------------------------------------------------------------------

/**

* Retrieve a cached query

*

* The URI being requested will become the name of the cache sub-folder.

* An MD5 hash of the SQL statement will become the cache file name.

*

* @param string $sql

* @return string

*/

public function read($sql)

{

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

$filepath = $this->db->cachedir.$segment_one.'+'.$segment_two.'/'.md5($sql);

if (FALSE === ($cachedata = @file_get_contents($filepath)))

{

return FALSE;

}

return unserialize($cachedata);

}

// --------------------------------------------------------------------

/**

* Write a query to a cache file

*

* @param string $sql

* @param object $object

* @return bool

*/

public function write($sql, $object)

{

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';

$filename = md5($sql);

if ( ! is_dir($dir_path) && ! @mkdir($dir_path, 0750))

{

return FALSE;

}

if (write_file($dir_path.$filename, serialize($object)) === FALSE)

{

return FALSE;

}

chmod($dir_path.$filename, 0640);

return TRUE;

}

// --------------------------------------------------------------------

/**

* Delete cache files within a particular directory

*

* @param string $segment_one

* @param string $segment_two

* @return void

*/

public function delete($segment_one = '', $segment_two = '')

{

if ($segment_one === '')

{

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

}

if ($segment_two === '')

{

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

}

$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';

delete_files($dir_path, TRUE);

}

// --------------------------------------------------------------------

/**

* Delete all existing cache files

*

* @return void

*/

public function delete_all()

{

delete_files($this->db->cachedir, TRUE, TRUE);

}

}

/* End of file DB_cache.php */

/* Location: ./system/database/DB_cache.php */