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<?php |
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namespace pastuhov\yii2redismutex; |
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use Yii; |
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use yii\mutex\Mutex; |
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use yii\redis\Connection; |
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use yii\di\Instance; |
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/** |
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* Redis mutex. |
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* |
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* @link http://redis.io/topics/distlock |
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* @see Mutex |
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*/ |
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class RedisMutex extends Mutex |
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{ |
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/** |
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* @var \yii\redis\Connection |
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*/ |
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public $redis; |
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/** |
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* Expire time, in seconds. |
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* |
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* @var int |
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*/ |
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public $expireTime = 3; |
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/** |
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* @inheritdoc |
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* |
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* @throws \yii\base\InvalidConfigException |
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*/ |
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public function init() |
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{ |
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parent::init(); |
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$this->redis = Instance::ensure($this->redis, Connection::className()); |
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} |
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/** |
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* Acquires lock by given name. |
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* |
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* @param string $name of the lock to be acquired. |
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* @param integer $timeout to wait for lock to become released. |
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* |
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* @return boolean acquiring result. |
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*/ |
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protected function acquireLock ($name, $timeout = 0) |
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{ |
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$redis = $this->getConnection(); |
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$lockValue = $this->getLockValue(); |
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$params = [ |
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3 |
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$name, // Key name |
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$lockValue, // Key value |
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'NX', // Set if Not eXists |
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'EX', // Expire time |
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$this->expireTime // Seconds |
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]; |
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$response = $redis->executeCommand('SET', $params); |
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if ($response === true) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Releases lock by given name. |
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* |
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* @param string $name of the lock to be released. |
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* |
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* @return boolean release result. |
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*/ |
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protected function releaseLock ($name) |
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{ |
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$redis = $this->getConnection(); |
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$lockValue = $this->getLockValue(); |
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$script = ' |
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if redis.call("get",KEYS[1]) == ARGV[1] |
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then |
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return redis.call("del",KEYS[1]) |
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else |
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return 0 |
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end |
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'; |
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$params = [ |
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$script, // Lua script |
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1, // the number of arguments that follows the script (starting from the third argument) |
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$name, // Key name |
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$lockValue // Key value |
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]; |
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$redis->executeCommand('EVAL', $params); |
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} |
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/** |
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* @return \yii\redis\Connection |
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*/ |
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3 |
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protected function getConnection() |
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{ |
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return $this->redis; |
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} |
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/** |
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* @var float|false |
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*/ |
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private $_lockValue = false; |
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113
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/** |
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* @return float|mixed |
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*/ |
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3 |
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public function getLockValue() |
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{ |
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3 |
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if ($this->_lockValue === false) { |
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3 |
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$this->_lockValue = microtime(true); |
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2 |
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} |
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3 |
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return $this->_lockValue; |
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} |
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} |
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pastuhov /
yii2-redis-mutex
