325 行
7.7 KiB
PHP
325 行
7.7 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 2.0
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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 Memcached 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 EllisLab Dev Team
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* @link
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*/
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class CI_Cache_memcached extends CI_Driver {
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/**
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* Holds the memcached object
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*
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* @var object
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*/
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protected $_memcached;
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/**
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* Memcached configuration
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*
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* @var array
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*/
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protected $_config = array(
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'default' => array(
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'host' => '127.0.0.1',
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'port' => 11211,
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'weight' => 1
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)
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);
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// ------------------------------------------------------------------------
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/**
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* Class constructor
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*
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* Setup Memcache(d)
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*
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* @return void
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*/
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public function __construct()
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{
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// Try to load memcached server info from the config file.
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$CI =& get_instance();
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$defaults = $this->_config['default'];
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if ($CI->config->load('memcached', TRUE, TRUE))
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{
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$this->_config = $CI->config->config['memcached'];
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}
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if (class_exists('Memcached', FALSE))
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{
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$this->_memcached = new Memcached();
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}
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elseif (class_exists('Memcache', FALSE))
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{
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$this->_memcached = new Memcache();
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}
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else
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{
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log_message('error', 'Cache: Failed to create Memcache(d) object; extension not loaded?');
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return;
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}
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foreach ($this->_config as $cache_name => $cache_server)
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{
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if ( ! isset($cache_server['hostname']))
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{
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log_message('debug', 'Cache: Memcache(d) configuration "'.$cache_name.'" doesn\'t include a hostname; ignoring.');
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continue;
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}
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elseif ($cache_server['hostname'][0] === '/')
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{
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$cache_server['port'] = 0;
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}
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elseif (empty($cache_server['port']))
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{
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$cache_server['port'] = $defaults['port'];
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}
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isset($cache_server['weight']) OR $cache_server['weight'] = $defaults['weight'];
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if ($this->_memcached instanceof Memcache)
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{
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// Third parameter is persistence and defaults to TRUE.
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$this->_memcached->addServer(
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$cache_server['hostname'],
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$cache_server['port'],
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TRUE,
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$cache_server['weight']
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);
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}
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elseif ($this->_memcached instanceof Memcached)
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{
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$this->_memcached->addServer(
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$cache_server['hostname'],
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$cache_server['port'],
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$cache_server['weight']
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);
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}
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Fetch from cache
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*
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* @param string $id Cache ID
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* @return mixed Data on success, FALSE on failure
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*/
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public function get($id)
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{
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$data = $this->_memcached->get($id);
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return is_array($data) ? $data[0] : $data;
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}
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// ------------------------------------------------------------------------
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/**
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* Save
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*
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* @param string $id Cache ID
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* @param mixed $data Data being cached
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* @param int $ttl Time to live
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* @param bool $raw Whether to store the raw value
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* @return bool TRUE on success, FALSE on failure
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*/
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public function save($id, $data, $ttl = 60, $raw = FALSE)
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{
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if ($raw !== TRUE)
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{
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$data = array($data, time(), $ttl);
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}
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if ($this->_memcached instanceof Memcached)
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{
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return $this->_memcached->set($id, $data, $ttl);
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}
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elseif ($this->_memcached instanceof Memcache)
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{
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return $this->_memcached->set($id, $data, 0, $ttl);
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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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* Delete from Cache
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*
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* @param mixed $id key to be deleted.
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* @return bool true on success, false on failure
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*/
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public function delete($id)
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{
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return $this->_memcached->delete($id);
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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, $offset = 1)
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{
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if (($result = $this->_memcached->increment($id, $offset)) === FALSE)
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{
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return $this->_memcached->add($id, $offset) ? $offset : FALSE;
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}
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return $result;
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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, $offset = 1)
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{
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if (($result = $this->_memcached->decrement($id, $offset)) === FALSE)
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{
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return $this->_memcached->add($id, 0) ? 0 : FALSE;
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}
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return $result;
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}
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// ------------------------------------------------------------------------
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/**
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* Clean the Cache
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*
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* @return bool false on failure/true on success
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*/
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public function clean()
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{
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return $this->_memcached->flush();
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}
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// ------------------------------------------------------------------------
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/**
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* Cache Info
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*
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* @return mixed array on success, false on failure
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*/
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public function cache_info()
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{
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return $this->_memcached->getStats();
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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 mixed $id key to get cache metadata on
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* @return mixed FALSE on failure, array on success.
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*/
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public function get_metadata($id)
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{
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$stored = $this->_memcached->get($id);
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if (count($stored) !== 3)
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{
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return FALSE;
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}
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list($data, $time, $ttl) = $stored;
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return array(
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'expire' => $time + $ttl,
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'mtime' => $time,
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'data' => $data
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);
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}
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// ------------------------------------------------------------------------
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/**
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* Is supported
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*
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* Returns FALSE if memcached is not supported on the system.
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* If it is, we setup the memcached object & return TRUE
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*
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* @return bool
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*/
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public function is_supported()
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{
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return (extension_loaded('memcached') OR extension_loaded('memcache'));
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}
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// ------------------------------------------------------------------------
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/**
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* Class destructor
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*
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* Closes the connection to Memcache(d) if present.
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*
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* @return void
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*/
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public function __destruct()
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{
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if ($this->_memcached instanceof Memcache)
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{
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$this->_memcached->close();
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}
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elseif ($this->_memcached instanceof Memcached && method_exists($this->_memcached, 'quit'))
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{
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$this->_memcached->quit();
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}
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}
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}
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