Merge CodeIgniter 3 support

1 files changed, 328 insertions, 0 deletions

diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
new file mode 100644
index 000000000..ac67be077
--- /dev/null
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -0,0 +1,328 @@
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, 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 - 2017, 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();
+		}
+	}
+}