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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2006 - 2011 EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 2.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter Redis Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author Anton Lindqvist <anton@qvister.se>
* @link
*/
class CI_Cache_redis extends CI_Driver
{
/**
* Default config
*
* @static
* @var array
*/
protected static $_default_config = array(
'host' => '127.0.0.1',
'port' => 6379,
'timeout' => 0
);
/**
* Redis connection
*
* @var Redis
*/
protected $_redis;
/**
* Class destructor
*
* Closes the connection to Redis if present.
*
* @return void
*/
public function __destruct()
{
if ($this->_redis)
{
$this->_redis->close();
}
}
/**
* Get cache
*
* @param string $key Cache key identifier
* @return mixed
*/
public function get($key)
{
return $this->_redis->get($key);
}
/**
* Save cache
*
* @param string $key Cache key identifier
* @param mixed $value Data to save
* @param integer $ttl Time to live
* @return boolean
*/
public function save($key, $value, $ttl = NULL)
{
return ($ttl)
? $this->_redis->setex($key, $ttl, $value)
: $this->_redis->set($key, $value);
}
/**
* Delete from cache
*
* @param string $key Cache key
* @return boolean
*/
public function delete($key)
{
return ($this->_redis->delete($key) === 1);
}
/**
* Clean cache
*
* @return boolean
* @see Redis::flushDB()
*/
public function clean()
{
return $this->_redis->flushDB();
}
/**
* Get cache driver info
*
* @param string $type Not supported in Redis. Only included in order to offer a
* consistent cache API.
* @return array
* @see Redis::info()
*/
public function cache_info($type = NULL)
{
return $this->_redis->info();
}
/**
* Get cache metadata
*
* @param string $key Cache key
* @return array
*/
public function get_metadata($key)
{
$value = $this->get($key);
if ($value)
{
return array(
'expire' => time() + $this->_redis->ttl($key),
'data' => $value
);
}
}
/**
* Check if Redis driver is supported
*
* @return boolean
*/
public function is_supported()
{
if (extension_loaded('redis'))
{
$this->_setup_redis();
return TRUE;
}
else
{
log_message('error', 'The Redis extension must be loaded to use Redis cache.');
return FALSE;
}
}
/**
* Setup Redis config and connection
*
* Loads Redis config file if present. Will halt execution if a Redis connection
* can't be established.
*
* @return void
* @see Redis::connect()
*/
private function _setup_redis()
{
$config = array();
$CI =& get_instance();
if ($CI->config->load('redis', TRUE, TRUE))
{
$config += $CI->config->item('redis');
}
$config = array_merge(self::$_default_config, $config);
$this->_redis = new Redis();
try
{
$this->_redis->connect($config['host'], $config['port'], $config['timeout']);
}
catch (RedisException $e)
{
show_error('Redis connection refused. ' . $e->getMessage());
}
}
}
// End Class
/* End of file Cache_redis.php */
/* Location: ./system/libraries/Cache/drivers/Cache_redis.php */
|
