Added redis cache driver

system/libraries/Cache/Cache.php

@@ -41,11 +41,12 @@ class CI_Cache extends CI_Driver_Library {
 	 *
 	 * @var array
 	 */
-	protected $valid_drivers = array(
+	protected $valid_drivers 	= array(
 		'cache_apc',
+		'cache_dummy',
 		'cache_file',
 		'cache_memcached',
-		'cache_dummy',
+		'cache_redis',
 		'cache_wincache'
 	);
 
@@ -225,4 +226,4 @@ public function is_supported($driver)
 }
 
 /* End of file Cache.php */
-/* Location: ./system/libraries/Cache/Cache.php */
+/* Location: ./system/libraries/Cache/Cache.php */

system/libraries/Cache/drivers/Cache_redis.php

@@ -0,0 +1,221 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * 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) 2006 - 2012 EllisLab, Inc.
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @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',
+		'password' => NULL,
+		'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()
+	 */
+	protected 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. ' . $e->getMessage());
+		}
+
+		if (isset($config['password']))
+		{
+			$this->_redis->auth($config['password']);
+		}
+	}
+
+}
+// End Class
+
+/* End of file Cache_redis.php */
+/* Location: ./system/libraries/Cache/drivers/Cache_redis.php */