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375 lines
9.3 KiB
375 lines
9.3 KiB
<?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 - 2017, 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 - 2017, 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 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 Session Memcached Driver
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Sessions
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* @author Andrey Andreev
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* @link https://codeigniter.com/user_guide/libraries/sessions.html
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*/
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class CI_Session_memcached_driver extends CI_Session_driver implements SessionHandlerInterface {
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/**
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* Memcached instance
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*
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* @var Memcached
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*/
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protected $_memcached;
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/**
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* Key prefix
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*
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* @var string
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*/
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protected $_key_prefix = 'ci_session:';
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/**
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* Lock key
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*
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* @var string
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*/
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protected $_lock_key;
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// ------------------------------------------------------------------------
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/**
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* Class constructor
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*
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* @param array $params Configuration parameters
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* @return void
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*/
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public function __construct(&$params)
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{
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parent::__construct($params);
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if (empty($this->_config['save_path']))
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{
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log_message('error', 'Session: No Memcached save path configured.');
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}
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if ($this->_config['match_ip'] === TRUE)
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{
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$this->_key_prefix .= $_SERVER['REMOTE_ADDR'].':';
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}
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}
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// ------------------------------------------------------------------------
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/**
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* Open
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*
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* Sanitizes save_path and initializes connections.
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*
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* @param string $save_path Server path(s)
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* @param string $name Session cookie name, unused
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* @return bool
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*/
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public function open($save_path, $name)
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{
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$this->_memcached = new Memcached();
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$this->_memcached->setOption(Memcached::OPT_BINARY_PROTOCOL, TRUE); // required for touch() usage
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$server_list = array();
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foreach ($this->_memcached->getServerList() as $server)
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{
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$server_list[] = $server['host'].':'.$server['port'];
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}
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if ( ! preg_match_all('#,?([^,:]+)\:(\d{1,5})(?:\:(\d+))?#', $this->_config['save_path'], $matches, PREG_SET_ORDER))
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{
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$this->_memcached = NULL;
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log_message('error', 'Session: Invalid Memcached save path format: '.$this->_config['save_path']);
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return $this->_fail();
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}
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foreach ($matches as $match)
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{
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// If Memcached already has this server (or if the port is invalid), skip it
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if (in_array($match[1].':'.$match[2], $server_list, TRUE))
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{
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log_message('debug', 'Session: Memcached server pool already has '.$match[1].':'.$match[2]);
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continue;
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}
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if ( ! $this->_memcached->addServer($match[1], $match[2], isset($match[3]) ? $match[3] : 0))
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{
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log_message('error', 'Could not add '.$match[1].':'.$match[2].' to Memcached server pool.');
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}
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else
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{
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$server_list[] = $match[1].':'.$match[2];
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}
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}
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if (empty($server_list))
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{
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log_message('error', 'Session: Memcached server pool is empty.');
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return $this->_fail();
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}
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return $this->_success;
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}
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// ------------------------------------------------------------------------
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/**
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* Read
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*
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* Reads session data and acquires a lock
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*
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* @param string $session_id Session ID
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* @return string Serialized session data
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*/
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public function read($session_id)
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{
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if (isset($this->_memcached) && $this->_get_lock($session_id))
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{
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// Needed by write() to detect session_regenerate_id() calls
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$this->_session_id = $session_id;
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$session_data = (string) $this->_memcached->get($this->_key_prefix.$session_id);
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$this->_fingerprint = md5($session_data);
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return $session_data;
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}
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return $this->_fail();
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}
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// ------------------------------------------------------------------------
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/**
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* Write
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*
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* Writes (create / update) session data
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*
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* @param string $session_id Session ID
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* @param string $session_data Serialized session data
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* @return bool
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*/
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public function write($session_id, $session_data)
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{
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if ( ! isset($this->_memcached, $this->_lock_key))
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{
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return $this->_fail();
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}
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// Was the ID regenerated?
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elseif ($session_id !== $this->_session_id)
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{
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if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id))
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{
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return $this->_fail();
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}
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$this->_fingerprint = md5('');
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$this->_session_id = $session_id;
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}
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$key = $this->_key_prefix.$session_id;
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$this->_memcached->replace($this->_lock_key, time(), 300);
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if ($this->_fingerprint !== ($fingerprint = md5($session_data)))
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{
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if ($this->_memcached->set($key, $session_data, $this->_config['expiration']))
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{
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$this->_fingerprint = $fingerprint;
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return $this->_success;
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}
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return $this->_fail();
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}
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elseif (
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$this->_memcached->touch($key, $this->_config['expiration'])
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OR ($this->_memcached->getResultCode() === Memcached::RES_NOTFOUND && $this->_memcached->set($key, $session_data, $this->_config['expiration']))
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)
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{
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return $this->_success;
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}
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return $this->_fail();
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}
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// ------------------------------------------------------------------------
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/**
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* Close
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*
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* Releases locks and closes connection.
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*
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* @return bool
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*/
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public function close()
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{
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if (isset($this->_memcached))
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{
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$this->_release_lock();
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if ( ! $this->_memcached->quit())
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{
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return $this->_fail();
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}
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$this->_memcached = NULL;
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return $this->_success;
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}
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return $this->_fail();
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}
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// ------------------------------------------------------------------------
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/**
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* Destroy
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*
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* Destroys the current session.
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*
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* @param string $session_id Session ID
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* @return bool
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*/
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public function destroy($session_id)
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{
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if (isset($this->_memcached, $this->_lock_key))
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{
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$this->_memcached->delete($this->_key_prefix.$session_id);
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$this->_cookie_destroy();
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return $this->_success;
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}
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return $this->_fail();
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}
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// ------------------------------------------------------------------------
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/**
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* Garbage Collector
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*
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* Deletes expired sessions
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*
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* @param int $maxlifetime Maximum lifetime of sessions
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* @return bool
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*/
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public function gc($maxlifetime)
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{
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// Not necessary, Memcached takes care of that.
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return $this->_success;
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}
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// ------------------------------------------------------------------------
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/**
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* Get lock
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*
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* Acquires an (emulated) lock.
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*
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* @param string $session_id Session ID
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* @return bool
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*/
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protected function _get_lock($session_id)
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{
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// PHP 7 reuses the SessionHandler object on regeneration,
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// so we need to check here if the lock key is for the
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// correct session ID.
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if ($this->_lock_key === $this->_key_prefix.$session_id.':lock')
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{
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if ( ! $this->_memcached->replace($this->_lock_key, time(), 300))
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{
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return ($this->_memcached->getResultCode() === Memcached::RES_NOTFOUND)
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? $this->_memcached->set($this->_lock_key, time(), 300)
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: FALSE;
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}
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}
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// 30 attempts to obtain a lock, in case another request already has it
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$lock_key = $this->_key_prefix.$session_id.':lock';
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$attempt = 0;
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do
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{
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if ($this->_memcached->get($lock_key))
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{
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sleep(1);
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continue;
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}
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if ( ! $this->_memcached->set($lock_key, time(), 300))
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{
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log_message('error', 'Session: Error while trying to obtain lock for '.$this->_key_prefix.$session_id);
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return FALSE;
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}
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$this->_lock_key = $lock_key;
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break;
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}
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while (++$attempt < 30);
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if ($attempt === 30)
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{
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log_message('error', 'Session: Unable to obtain lock for '.$this->_key_prefix.$session_id.' after 30 attempts, aborting.');
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return FALSE;
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}
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$this->_lock = TRUE;
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return TRUE;
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}
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// ------------------------------------------------------------------------
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/**
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* Release lock
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*
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* Releases a previously acquired lock
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*
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* @return bool
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*/
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protected function _release_lock()
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{
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if (isset($this->_memcached, $this->_lock_key) && $this->_lock)
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{
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if ( ! $this->_memcached->delete($this->_lock_key) && $this->_memcached->getResultCode() !== Memcached::RES_NOTFOUND)
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{
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log_message('error', 'Session: Error while trying to free lock for '.$this->_lock_key);
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return FALSE;
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}
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$this->_lock_key = NULL;
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$this->_lock = FALSE;
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}
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return TRUE;
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}
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}
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