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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/) * @license https://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 2.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * CodeIgniter Memcached Caching Class * * @package CodeIgniter * @subpackage Libraries * @category Core * @author EllisLab Dev Team * @link */ class CI_Cache_memcached extends CI_Driver { /** * Holds the memcached object * * @var object */ protected $_memcached; /** * Memcached configuration * * @var array */ protected $_config = array( 'default' => array( 'host' => '127.0.0.1', 'port' => 11211, 'weight' => 1 ) ); // ------------------------------------------------------------------------ /** * Class constructor * * Setup Memcache(d) * * @return void */ public function __construct() { // Try to load memcached server info from the config file. $CI =& get_instance(); $defaults = $this->_config['default']; if ($CI->config->load('memcached', TRUE, TRUE)) { $this->_config = $CI->config->config['memcached']; } if (class_exists('Memcached', FALSE)) { $this->_memcached = new Memcached(); } elseif (class_exists('Memcache', FALSE)) { $this->_memcached = new Memcache(); } else { log_message('error', 'Cache: Failed to create Memcache(d) object; extension not loaded?'); return; } foreach ($this->_config as $cache_server) { isset($cache_server['hostname']) OR $cache_server['hostname'] = $defaults['host']; isset($cache_server['port']) OR $cache_server['port'] = $defaults['port']; isset($cache_server['weight']) OR $cache_server['weight'] = $defaults['weight']; if ($this->_memcached instanceof Memcache) { // Third parameter is persistence and defaults to TRUE. $this->_memcached->addServer( $cache_server['hostname'], $cache_server['port'], TRUE, $cache_server['weight'] ); } elseif ($this->_memcached instanceof Memcached) { $this->_memcached->addServer( $cache_server['hostname'], $cache_server['port'], $cache_server['weight'] ); } } } // ------------------------------------------------------------------------ /** * Fetch from cache * * @param string $id Cache ID * @return mixed Data on success, FALSE on failure */ public function get($id) { $data = $this->_memcached->get($id); return is_array($data) ? $data[0] : $data; } // ------------------------------------------------------------------------ /** * Save * * @param string $id Cache ID * @param mixed $data Data being cached * @param int $ttl Time to live * @param bool $raw Whether to store the raw value * @return bool TRUE on success, FALSE on failure */ public function save($id, $data, $ttl = 60, $raw = FALSE) { if ($raw !== TRUE) { $data = array($data, time(), $ttl); } if ($this->_memcached instanceof Memcached) { return $this->_memcached->set($id, $data, $ttl); } elseif ($this->_memcached instanceof Memcache) { return $this->_memcached->set($id, $data, 0, $ttl); } return FALSE; } // ------------------------------------------------------------------------ /** * Delete from Cache * * @param mixed $id key to be deleted. * @return bool true on success, false on failure */ public function delete($id) { return $this->_memcached->delete($id); } // ------------------------------------------------------------------------ /** * 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, $offset = 1) { if (($result = $this->_memcached->increment($id, $offset)) === FALSE) { return $this->_memcached->add($id, $offset) ? $offset : FALSE; } return $result; } // ------------------------------------------------------------------------ /** * 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, $offset = 1) { if (($result = $this->_memcached->decrement($id, $offset)) === FALSE) { return $this->_memcached->add($id, 0) ? 0 : FALSE; } return $result; } // ------------------------------------------------------------------------ /** * Clean the Cache * * @return bool false on failure/true on success */ public function clean() { return $this->_memcached->flush(); } // ------------------------------------------------------------------------ /** * Cache Info * * @return mixed array on success, false on failure */ public function cache_info() { return $this->_memcached->getStats(); } // ------------------------------------------------------------------------ /** * Get Cache Metadata * * @param mixed $id key to get cache metadata on * @return mixed FALSE on failure, array on success. */ public function get_metadata($id) { $stored = $this->_memcached->get($id); if (count($stored) !== 3) { return FALSE; } list($data, $time, $ttl) = $stored; return array( 'expire' => $time + $ttl, 'mtime' => $time, 'data' => $data ); } // ------------------------------------------------------------------------ /** * Is supported * * Returns FALSE if memcached is not supported on the system. * If it is, we setup the memcached object & return TRUE * * @return bool */ public function is_supported() { return (extension_loaded('memcached') OR extension_loaded('memcache')); } // ------------------------------------------------------------------------ /** * Class destructor * * Closes the connection to Memcache(d) if present. * * @return void */ public function __destruct() { if ($this->_memcached instanceof Memcache) { $this->_memcached->close(); } elseif ($this->_memcached instanceof Memcached && method_exists($this->_memcached, 'quit')) { $this->_memcached->quit(); } } }
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