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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 3.0.0

 * @filesource

 */

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

/**

 * 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(

		'socket_type' => 'tcp',

		'host' => '127.0.0.1',

		'password' => NULL,

		'port' => 6379,

		'timeout' => 0

	);

	/**

	 * Redis connection

	 *

	 * @var	Redis

	 */

	protected $_redis;

	/**

	 * An internal cache for storing keys of serialized values.

	 *

	 * @var	array

	 */

	protected $_serialized = array();

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

	/**

	 * Class constructor

	 *

	 * Setup Redis

	 *

	 * Loads Redis config file if present. Will halt execution

	 * if a Redis connection can't be established.

	 *

	 * @return	void

	 * @see		Redis::connect()

	 */

	public function __construct()

	{

		if ( ! $this->is_supported())

		{

			log_message('error', 'Cache: Failed to create Redis object; extension not loaded?');

			return;

		}

		$CI =& get_instance();

		if ($CI->config->load('redis', TRUE, TRUE))

		{

			$config = array_merge(self::$_default_config, $CI->config->item('redis'));

		}

		else

		{

			$config = self::$_default_config;

		}

		$this->_redis = new Redis();

		try

		{

			if ($config['socket_type'] === 'unix')

			{

				$success = $this->_redis->connect($config['socket']);

			}

			else // tcp socket

			{

				$success = $this->_redis->connect($config['host'], $config['port'], $config['timeout']);

			}

			if ( ! $success)

			{

				log_message('error', 'Cache: Redis connection failed. Check your configuration.');

			}

			if (isset($config['password']) && ! $this->_redis->auth($config['password']))

			{

				log_message('error', 'Cache: Redis authentication failed.');

			}

		}

		catch (RedisException $e)

		{

			log_message('error', 'Cache: Redis connection refused ('.$e->getMessage().')');

		}

		// Initialize the index of serialized values.

		$serialized = $this->_redis->sMembers('_ci_redis_serialized');

		empty($serialized) OR $this->_serialized = array_flip($serialized);

	}

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

	/**

	 * Get cache

	 *

	 * @param	string	$key	Cache ID

	 * @return	mixed

	 */

	public function get($key)

	{

		$value = $this->_redis->get($key);

		if ($value !== FALSE && isset($this->_serialized[$key]))

		{

			return unserialize($value);

		}

		return $value;

	}

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

	/**

	 * Save cache

	 *

	 * @param	string	$id	Cache ID

	 * @param	mixed	$data	Data to save

	 * @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)

	{

		if (is_array($data) OR is_object($data))

		{

			if ( ! $this->_redis->sIsMember('_ci_redis_serialized', $id) && ! $this->_redis->sAdd('_ci_redis_serialized', $id))

			{

				return FALSE;

			}

			isset($this->_serialized[$id]) OR $this->_serialized[$id] = TRUE;

			$data = serialize($data);

		}

		elseif (isset($this->_serialized[$id]))

		{

			$this->_serialized[$id] = NULL;

			$this->_redis->sRemove('_ci_redis_serialized', $id);

		}

		return $this->_redis->set($id, $data, $ttl);

	}

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

	/**

	 * Delete from cache

	 *

	 * @param	string	$key	Cache key

	 * @return	bool

	 */

	public function delete($key)

	{

		if ($this->_redis->delete($key) !== 1)

		{

			return FALSE;

		}

		if (isset($this->_serialized[$key]))

		{

			$this->_serialized[$key] = NULL;

			$this->_redis->sRemove('_ci_redis_serialized', $key);

		}

		return TRUE;

	}

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

	/**

	 * 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)

	{

		return $this->_redis->incr($id, $offset);

	}

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

	/**

	 * 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)

	{

		return $this->_redis->decr($id, $offset);

	}

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

	/**

	 * Clean cache

	 *

	 * @return	bool

	 * @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 !== FALSE)

		{

			return array(

				'expire' => time() + $this->_redis->ttl($key),

				'data' => $value

			);

		}

		return FALSE;

	}

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

	/**

	 * Check if Redis driver is supported

	 *

	 * @return	bool

	 */

	public function is_supported()

	{

		return extension_loaded('redis');

	}

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

	/**

	 * Class destructor

	 *

	 * Closes the connection to Redis if present.

	 *

	 * @return	void

	 */

	public function __destruct()

	{

		if ($this->_redis)

		{

			$this->_redis->close();

		}

	}

}