From 1e8be299b1c0f6385fb0536a6983147bd8ac029e Mon Sep 17 00:00:00 2001
From: Anton Lindqvist <anton@qvister.se>
Date: Sat, 21 Jan 2012 12:25:08 +0100
Subject: Added redis cache driver.

---
 system/libraries/Cache/drivers/Cache_redis.php | 217 +++++++++++++++++++++++++
 1 file changed, 217 insertions(+)
 create mode 100644 system/libraries/Cache/drivers/Cache_redis.php

(limited to 'system/libraries/Cache/drivers/Cache_redis.php')

diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
new file mode 100644
index 000000000..9eb7a8d4e
--- /dev/null
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -0,0 +1,217 @@
+<?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
+	 *
+	 * @access private
+	 * @static
+	 * @var array
+	 */
+	private static $_default_config = array(
+		'host' => '127.0.0.1',
+		'port' => 6379,
+		'timeout' => 0
+	);
+
+	/**
+	 * Redis connection
+	 *
+	 * @access private
+	 * @var Redis
+	 */
+	private $_redis;
+
+	/**
+	 * Class destructor
+	 *
+	 * Closes the connection to Redis if present.
+	 *
+	 * @access public
+	 * @return void
+	 */
+	public function __destruct()
+	{
+		if ($this->_redis)
+        {
+			$this->_redis->close();
+		}
+	}
+
+	/**
+	 * Get cache
+	 *
+	 * @access public
+	 * @param string $key Cache key identifier
+	 * @return mixed
+	 */
+	public function get($key)
+	{
+		return $this->_redis->get($key);
+	}
+
+	/**
+	 * Save cache
+	 *
+	 * @access public
+	 * @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
+	 *
+	 * @access public
+	 * @param string $key Cache key
+	 * @return boolean
+	 */
+	public function delete($key)
+	{
+		return ($this->_redis->delete($key) === 1);
+	}
+
+	/**
+	 * Clean cache
+	 *
+	 * @access public
+	 * @return boolean
+	 * @see Redis::flushDB()
+	 */
+	public function clean()
+	{
+		return $this->_redis->flushDB();
+	}
+
+	/**
+	 * Get cache driver info
+	 *
+	 * @access public
+	 * @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
+	 *
+	 * @access public
+	 * @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
+	 *
+	 * @access public
+	 * @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.
+	 *
+	 * @access private
+	 * @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 */
\ No newline at end of file
-- 
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