364 行
8.3 KiB
PHP
364 行
8.3 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 - 2019, 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. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://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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'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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'database' => 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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* del()/delete() method name depending on phpRedis version
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*
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* @var string
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*/
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protected static $_delete_name;
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/**
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* sRem()/sRemove() method name depending on phpRedis version
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*
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* @var string
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*/
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protected static $_sRemove_name;
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// ------------------------------------------------------------------------
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/**
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* Class constructor
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*
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* Setup Redis
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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 void
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* @see Redis::connect()
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*/
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public function __construct()
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{
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if ( ! $this->is_supported())
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{
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log_message('error', 'Cache: Failed to create Redis object; extension not loaded?');
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return;
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}
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if ( ! isset(static::$_delete_name, static::$_sRemove_name))
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{
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if (version_compare(phpversion('redis'), '5', '>='))
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{
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static::$_delete_name = 'del';
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static::$_sRemove_name = 'sRem';
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}
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else
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{
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static::$_delete_name = 'delete';
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static::$_sRemove_name = 'sRemove';
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}
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}
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$CI =& get_instance();
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if ($CI->config->load('redis', TRUE, TRUE))
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{
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$config = array_merge(self::$_default_config, $CI->config->item('redis'));
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}
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else
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{
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$config = self::$_default_config;
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}
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$this->_redis = new Redis();
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try
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{
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if ( ! $this->_redis->connect($config['host'], ($config['host'][0] === '/' ? 0 : $config['port']), $config['timeout']))
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{
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log_message('error', 'Cache: Redis connection failed. Check your configuration.');
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}
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if (isset($config['password']) && ! $this->_redis->auth($config['password']))
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{
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log_message('error', 'Cache: Redis authentication failed.');
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}
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if (isset($config['database']) && $config['database'] > 0 && ! $this->_redis->select($config['database']))
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{
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log_message('error', 'Cache: Redis select database failed.');
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}
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}
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catch (RedisException $e)
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{
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log_message('error', 'Cache: Redis connection refused ('.$e->getMessage().')');
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Get cache
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*
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* @param string $key Cache ID
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* @return mixed
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*/
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public function get($key)
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{
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$data = $this->_redis->hMGet($key, array('__ci_type', '__ci_value'));
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if ($value !== FALSE && $this->_redis->sIsMember('_ci_redis_serialized', $key))
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{
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return FALSE;
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}
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switch ($data['__ci_type'])
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{
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case 'array':
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case 'object':
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return unserialize($data['__ci_value']);
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case 'boolean':
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case 'integer':
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case 'double': // Yes, 'double' is returned and NOT 'float'
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case 'string':
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case 'NULL':
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return settype($data['__ci_value'], $data['__ci_type'])
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? $data['__ci_value']
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: FALSE;
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case 'resource':
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default:
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return FALSE;
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}
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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, $raw = FALSE)
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{
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switch ($data_type = gettype($data))
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{
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case 'array':
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case 'object':
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$data = serialize($data);
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break;
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case 'boolean':
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case 'integer':
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case 'double': // Yes, 'double' is returned and NOT 'float'
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case 'string':
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case 'NULL':
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break;
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case 'resource':
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default:
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return FALSE;
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}
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if ( ! $this->_redis->hMSet($id, array('__ci_type' => $data_type, '__ci_value' => $data)))
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{
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return FALSE;
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}
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else
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{
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$this->_redis->{static::$_sRemove_name}('_ci_redis_serialized', $id);
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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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* Delete from cache
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*
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* @param string $key Cache key
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* @return bool
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*/
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public function delete($key)
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{
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if ($this->_redis->{static::$_delete_name}($key) !== 1)
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{
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return FALSE;
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}
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$this->_redis->{static::$_sRemove_name}('_ci_redis_serialized', $key);
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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 $this->_redis->incrBy($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 $this->_redis->decrBy($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 $type Not supported in Redis.
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* Only included in order to offer a
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* consistent cache API.
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* @return array
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* @see Redis::info()
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*/
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public function cache_info($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 $key Cache key
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* @return array
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*/
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public function get_metadata($key)
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{
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$value = $this->get($key);
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if ($value !== FALSE)
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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' => $value
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);
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}
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return FALSE;
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}
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// ------------------------------------------------------------------------
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/**
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* Check if Redis driver is supported
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*
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* @return bool
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*/
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public function is_supported()
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{
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return extension_loaded('redis');
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}
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// ------------------------------------------------------------------------
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/**
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* Class destructor
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*
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* Closes the connection to Redis if present.
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*
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* @return void
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*/
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public function __destruct()
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{
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if ($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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