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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 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
* @license https://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 Memcached Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author EllisLab Dev Team
* @link
*/
class CI_Cache_memcached extends CI_Driver {
/**
* Holds the memcached object
*
* @var object
*/
protected $_memcached;
/**
* Memcached configuration
*
* @var array
*/
protected $_config = array(
'default' => array(
'host' => '127.0.0.1',
'port' => 11211,
'weight' => 1
)
);
// ------------------------------------------------------------------------
/**
* Class constructor
*
* Setup Memcache(d)
*
* @return void
*/
public function __construct()
{
// Try to load memcached server info from the config file.
$CI =& get_instance();
$defaults = $this->_config['default'];
if ($CI->config->load('memcached', TRUE, TRUE))
{
$this->_config = $CI->config->config['memcached'];
}
if (class_exists('Memcached', FALSE))
{
$this->_memcached = new Memcached();
}
elseif (class_exists('Memcache', FALSE))
{
$this->_memcached = new Memcache();
}
else
{
log_message('error', 'Cache: Failed to create Memcache(d) object; extension not loaded?');
return;
}
foreach ($this->_config as $cache_server)
{
isset($cache_server['hostname']) OR $cache_server['hostname'] = $defaults['host'];
isset($cache_server['port']) OR $cache_server['port'] = $defaults['port'];
isset($cache_server['weight']) OR $cache_server['weight'] = $defaults['weight'];
if ($this->_memcached instanceof Memcache)
{
// Third parameter is persistence and defaults to TRUE.
$this->_memcached->addServer(
$cache_server['hostname'],
$cache_server['port'],
TRUE,
$cache_server['weight']
);
}
elseif ($this->_memcached instanceof Memcached)
{
$this->_memcached->addServer(
$cache_server['hostname'],
$cache_server['port'],
$cache_server['weight']
);
}
}
}
// ------------------------------------------------------------------------
/**
* Fetch from cache
*
* @param string $id Cache ID
* @return mixed Data on success, FALSE on failure
*/
public function get($id)
{
$data = $this->_memcached->get($id);
return is_array($data) ? $data[0] : $data;
}
// ------------------------------------------------------------------------
/**
* Save
*
* @param string $id Cache ID
* @param mixed $data Data being cached
* @param int $ttl Time to live
* @param bool $raw Whether to store the raw value
* @return bool TRUE on success, FALSE on failure
*/
public function save($id, $data, $ttl = 60, $raw = FALSE)
{
if ($raw !== TRUE)
{
$data = array($data, time(), $ttl);
}
if ($this->_memcached instanceof Memcached)
{
return $this->_memcached->set($id, $data, $ttl);
}
elseif ($this->_memcached instanceof Memcache)
{
return $this->_memcached->set($id, $data, 0, $ttl);
}
return FALSE;
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed $id key to be deleted.
* @return bool true on success, false on failure
*/
public function delete($id)
{
return $this->_memcached->delete($id);
}
// ------------------------------------------------------------------------
/**
* Increment a raw value
*
* @param string $id Cache ID
* @param int $offset Step/value to add
* @return mixed New value on success or FALSE on failure
*/
public function increment($id, $offset = 1)
{
if (($result = $this->_memcached->increment($id, $offset)) === FALSE)
{
return $this->_memcached->add($id, $offset) ? $offset : FALSE;
}
return $result;
}
// ------------------------------------------------------------------------
/**
* Decrement a raw value
*
* @param string $id Cache ID
* @param int $offset Step/value to reduce by
* @return mixed New value on success or FALSE on failure
*/
public function decrement($id, $offset = 1)
{
if (($result = $this->_memcached->decrement($id, $offset)) === FALSE)
{
return $this->_memcached->add($id, 0) ? 0 : FALSE;
}
return $result;
}
// ------------------------------------------------------------------------
/**
* Clean the Cache
*
* @return bool false on failure/true on success
*/
public function clean()
{
return $this->_memcached->flush();
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* @return mixed array on success, false on failure
*/
public function cache_info()
{
return $this->_memcached->getStats();
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed $id key to get cache metadata on
* @return mixed FALSE on failure, array on success.
*/
public function get_metadata($id)
{
$stored = $this->_memcached->get($id);
if (count($stored) !== 3)
{
return FALSE;
}
list($data, $time, $ttl) = $stored;
return array(
'expire' => $time + $ttl,
'mtime' => $time,
'data' => $data
);
}
// ------------------------------------------------------------------------
/**
* Is supported
*
* Returns FALSE if memcached is not supported on the system.
* If it is, we setup the memcached object & return TRUE
*
* @return bool
*/
public function is_supported()
{
return (extension_loaded('memcached') OR extension_loaded('memcache'));
}
// ------------------------------------------------------------------------
/**
* Class destructor
*
* Closes the connection to Memcache(d) if present.
*
* @return void
*/
public function __destruct()
{
if ($this->_memcached instanceof Memcache)
{
$this->_memcached->close();
}
elseif ($this->_memcached instanceof Memcached && method_exists($this->_memcached, 'quit'))
{
$this->_memcached->quit();
}
}
}