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<?php |
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/** |
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* @link https://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license https://www.yiiframework.com/license/ |
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*/ |
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namespace yii\mutex; |
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use yii\base\InvalidConfigException; |
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use yii\db\Expression; |
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/** |
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* MysqlMutex implements mutex "lock" mechanism via MySQL locks. |
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* |
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* Application configuration example: |
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* |
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* ``` |
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* [ |
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* 'components' => [ |
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* 'db' => [ |
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* 'class' => 'yii\db\Connection', |
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* 'dsn' => 'mysql:host=127.0.0.1;dbname=demo', |
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* ] |
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* 'mutex' => [ |
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* 'class' => 'yii\mutex\MysqlMutex', |
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* ], |
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* ], |
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* ] |
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* ``` |
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* |
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* @see Mutex |
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* |
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* @author resurtm <[email protected]> |
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* @since 2.0 |
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*/ |
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class MysqlMutex extends DbMutex |
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{ |
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/** |
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* @var Expression|string|null prefix value. If null (by default) then connection's current database name is used. |
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* @since 2.0.47 |
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*/ |
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public $keyPrefix = null; |
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/** |
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* Initializes MySQL specific mutex component implementation. |
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* @throws InvalidConfigException if [[db]] is not MySQL connection. |
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*/ |
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public function init() |
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{ |
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parent::init(); |
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if ($this->db->driverName !== 'mysql') { |
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throw new InvalidConfigException('In order to use MysqlMutex connection must be configured to use MySQL database.'); |
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} |
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if ($this->keyPrefix === null) { |
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$this->keyPrefix = new Expression('DATABASE()'); |
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} |
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} |
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/** |
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* Acquires lock by given name. |
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* @param string $name of the lock to be acquired. |
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* @param int $timeout time (in seconds) to wait for lock to become released. |
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* @return bool acquiring result. |
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* @see https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_get-lock |
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*/ |
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protected function acquireLock($name, $timeout = 0) |
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{ |
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return $this->db->useMaster(function ($db) use ($name, $timeout) { |
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/** @var \yii\db\Connection $db */ |
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$nameData = $this->prepareName(); |
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return (bool)$db->createCommand( |
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'SELECT GET_LOCK(' . $nameData[0] . ', :timeout), :prefix', |
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array_merge( |
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[':name' => $this->hashLockName($name), ':timeout' => $timeout, ':prefix' => $this->keyPrefix], |
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$nameData[1] |
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) |
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)->queryScalar(); |
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}); |
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} |
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/** |
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* Releases lock by given name. |
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* @param string $name of the lock to be released. |
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* @return bool release result. |
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* @see https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_release-lock |
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*/ |
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protected function releaseLock($name) |
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{ |
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return $this->db->useMaster(function ($db) use ($name) { |
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/** @var \yii\db\Connection $db */ |
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$nameData = $this->prepareName(); |
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return (bool)$db->createCommand( |
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'SELECT RELEASE_LOCK(' . $nameData[0] . '), :prefix', |
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array_merge( |
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[':name' => $this->hashLockName($name), ':prefix' => $this->keyPrefix], |
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$nameData[1] |
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) |
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)->queryScalar(); |
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}); |
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} |
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/** |
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* Prepare lock name |
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* @return array expression and params |
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* @since 2.0.48 |
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*/ |
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protected function prepareName() |
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{ |
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$params = []; |
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$expression = "SUBSTRING(CONCAT(:prefix, :name), 1, 64)"; |
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if ($this->keyPrefix instanceof Expression) { |
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$expression = strtr($expression, [':prefix' => $this->keyPrefix->expression]); |
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$params = $this->keyPrefix->params; |
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} |
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return [$expression, $params]; |
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} |
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/** |
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* Generate hash for lock name to avoid exceeding lock name length limit. |
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* |
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* @param string $name |
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* @return string |
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* @since 2.0.16 |
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* @see https://github.com/yiisoft/yii2/pull/16836 |
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*/ |
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protected function hashLockName($name) |
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{ |
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return sha1($name); |
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} |
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} |
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rob006 /
yii2-dev
