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<?php |
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namespace Tourstream\RedisLockStrategy; |
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/*************************************************************** |
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* Copyright notice |
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* |
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* (c) 2017 Alexander Miehe ([email protected]) |
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* All rights reserved |
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* |
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* You may not remove or change the name of the author above. See: |
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* http://www.gnu.org/licenses/gpl-faq.html#IWantCredit |
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* |
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* This script is part of the Typo3 project. The Typo3 project is |
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* free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* The GNU General Public License can be found at |
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* http://www.gnu.org/copyleft/gpl.html. |
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* A copy is found in the LICENSE and distributed with these scripts. |
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* |
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* |
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* This script is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* This copyright notice MUST APPEAR in all copies of the script! |
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***************************************************************/ |
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use TYPO3\CMS\Core\Locking\Exception; |
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use TYPO3\CMS\Core\Locking\LockingStrategyInterface; |
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/** |
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* @author Alexander Miehe <[email protected]> |
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*/ |
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class RedisLockStrategy implements LockingStrategyInterface |
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{ |
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/** |
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* @var \Redis |
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*/ |
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private $redis; |
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/** |
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* @var string |
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*/ |
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private $subject; |
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/** |
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* @var int |
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*/ |
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private $ttl; |
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/** |
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* @inheritdoc |
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*/ |
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public function __construct($subject) |
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{ |
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$config = null; |
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if (\array_key_exists('redis_lock', $GLOBALS['TYPO3_CONF_VARS']['SYS'])) { |
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$config = $GLOBALS['TYPO3_CONF_VARS']['SYS']['redis_lock']; |
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} |
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if (!\is_array($config)) { |
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throw new Exception('no configuration for redis lock strategy found'); |
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} |
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if (!\array_key_exists('host', $config)) { |
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throw new Exception('no host for redis lock strategy found'); |
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} |
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$port = 6379; |
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if (\array_key_exists('port', $config)) { |
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$port = (int) $config['port']; |
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} |
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if (!\array_key_exists('database', $config)) { |
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throw new Exception('no database for redis lock strategy found'); |
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} |
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$this->ttl = 360; |
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if (\array_key_exists('ttl', $config)) { |
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$this->ttl = (int) $config['ttl']; |
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} |
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$this->subject = $subject; |
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$this->redis = new \Redis(); |
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$this->redis->connect($config['host'], $port); |
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if (\array_key_exists('auth', $config)) { |
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$this->redis->auth($config['auth']); |
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} |
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$this->redis->select((int) $config['database']); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public static function getCapabilities() |
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{ |
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return self::LOCK_CAPABILITY_EXCLUSIVE | self::LOCK_CAPABILITY_NOBLOCK; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public static function getPriority() |
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{ |
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return 100; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function acquire($mode = self::LOCK_CAPABILITY_EXCLUSIVE) |
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{ |
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if ($this->isAcquired()) { |
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return true; |
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} |
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return $this->redis->set($this->subject, uniqid(), $this->ttl); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function isAcquired() |
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{ |
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return $this->redis->exists($this->subject); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function destroy() |
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{ |
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$this->release(); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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2 |
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public function release() |
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{ |
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2 |
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if (!$this->isAcquired()) { |
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return true; |
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} |
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return $this->redis->del($this->subject) === 1; |
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} |
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} |
tourstream /
typo3-redis-lock-strategy
