336 lines
7.5 KiB
PHP
336 lines
7.5 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2015, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link http://codeigniter.com
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* @since Version 3.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* CodeIgniter Redis Caching Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Core
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* @author Anton Lindqvist <anton@qvister.se>
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* @link
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*/
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class CI_Cache_redis extends CI_Driver
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{
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/**
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* Default config
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*
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* @static
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* @var array
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*/
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protected static $_default_config = array(
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'socket_type' => 'tcp',
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'host' => '127.0.0.1',
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'password' => NULL,
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'port' => 6379,
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'timeout' => 0
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);
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/**
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* Redis connection
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*
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* @var Redis
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*/
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protected $_redis;
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/**
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* An internal cache for storing keys of serialized values.
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*
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* @var array
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*/
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protected $_serialized = array();
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// ------------------------------------------------------------------------
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/**
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* Get cache
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*
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* @param string Cache ID
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* @return mixed
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*/
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public function get($key)
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{
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$value = $this->_redis->get($key);
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if ($value !== FALSE && isset($this->_serialized[$key]))
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{
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return unserialize($value);
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}
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return $value;
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}
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// ------------------------------------------------------------------------
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/**
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* Save cache
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*
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* @param string $id Cache ID
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* @param mixed $data Data to save
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* @param int $ttl Time to live in seconds
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* @param bool $raw Whether to store the raw value (unused)
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* @return bool TRUE on success, FALSE on failure
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*/
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public function save($id, $data, $ttl = 60, $raw = FALSE)
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{
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if (is_array($data) OR is_object($data))
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{
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if ( ! $this->_redis->sIsMember('_ci_redis_serialized', $id) && ! $this->_redis->sAdd('_ci_redis_serialized', $id))
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{
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return FALSE;
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}
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isset($this->_serialized[$id]) OR $this->_serialized[$id] = TRUE;
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$data = serialize($data);
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}
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elseif (isset($this->_serialized[$id]))
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{
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$this->_serialized[$id] = NULL;
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$this->_redis->sRemove('_ci_redis_serialized', $id);
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}
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return ($ttl)
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? $this->_redis->setex($id, $ttl, $data)
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: $this->_redis->set($id, $data);
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}
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// ------------------------------------------------------------------------
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/**
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* Delete from cache
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*
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* @param string Cache key
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* @return bool
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*/
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public function delete($key)
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{
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if ($this->_redis->delete($key) !== 1)
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{
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return FALSE;
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}
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if (isset($this->_serialized[$key]))
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{
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$this->_serialized[$key] = NULL;
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$this->_redis->sRemove('_ci_redis_serialized', $key);
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}
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return TRUE;
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}
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// ------------------------------------------------------------------------
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/**
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* Increment a raw value
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*
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* @param string $id Cache ID
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* @param int $offset Step/value to add
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* @return mixed New value on success or FALSE on failure
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*/
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public function increment($id, $offset = 1)
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{
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return $this->_redis->incr($id, $offset);
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}
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// ------------------------------------------------------------------------
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/**
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* Decrement a raw value
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*
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* @param string $id Cache ID
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* @param int $offset Step/value to reduce by
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* @return mixed New value on success or FALSE on failure
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*/
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public function decrement($id, $offset = 1)
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{
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return $this->_redis->decr($id, $offset);
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}
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// ------------------------------------------------------------------------
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/**
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* Clean cache
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*
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* @return bool
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* @see Redis::flushDB()
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*/
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public function clean()
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{
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return $this->_redis->flushDB();
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}
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// ------------------------------------------------------------------------
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/**
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* Get cache driver info
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*
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* @param string Not supported in Redis.
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* Only included in order to offer a
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* consistent cache API.
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* @return array
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* @see Redis::info()
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*/
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public function cache_info($type = NULL)
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{
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return $this->_redis->info();
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}
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// ------------------------------------------------------------------------
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/**
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* Get cache metadata
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*
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* @param string Cache key
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* @return array
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*/
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public function get_metadata($key)
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{
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$value = $this->get($key);
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if ($value)
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{
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return array(
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'expire' => time() + $this->_redis->ttl($key),
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'data' => $value
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);
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}
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return FALSE;
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}
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// ------------------------------------------------------------------------
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/**
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* Check if Redis driver is supported
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*
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* @return bool
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*/
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public function is_supported()
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{
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if ( ! extension_loaded('redis'))
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{
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log_message('debug', 'The Redis extension must be loaded to use Redis cache.');
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return FALSE;
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}
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return $this->_setup_redis();
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}
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// ------------------------------------------------------------------------
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/**
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* Setup Redis config and connection
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*
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* Loads Redis config file if present. Will halt execution
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* if a Redis connection can't be established.
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*
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* @return bool
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* @see Redis::connect()
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*/
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protected function _setup_redis()
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{
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$config = array();
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$CI =& get_instance();
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if ($CI->config->load('redis', TRUE, TRUE))
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{
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$config += $CI->config->item('redis');
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}
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$config = array_merge(self::$_default_config, $config);
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$this->_redis = new Redis();
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try
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{
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if ($config['socket_type'] === 'unix')
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{
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$success = $this->_redis->connect($config['socket']);
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}
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else // tcp socket
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{
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$success = $this->_redis->connect($config['host'], $config['port'], $config['timeout']);
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}
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if ( ! $success)
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{
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log_message('debug', 'Cache: Redis connection refused. Check the config.');
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return FALSE;
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}
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}
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catch (RedisException $e)
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{
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log_message('debug', 'Cache: Redis connection refused ('.$e->getMessage().')');
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return FALSE;
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}
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if (isset($config['password']))
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{
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$this->_redis->auth($config['password']);
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}
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// Initialize the index of serialized values.
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$serialized = $this->_redis->sMembers('_ci_redis_serialized');
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if ( ! empty($serialized))
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{
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$this->_serialized = array_flip($serialized);
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}
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return TRUE;
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}
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// ------------------------------------------------------------------------
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/**
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* Class destructor
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*
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* Closes the connection to Redis if present.
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*
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* @return void
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*/
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public function __destruct()
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{
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if ($this->_redis)
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{
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$this->_redis->close();
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}
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}
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}
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