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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Mutex\Mysql; |
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use InvalidArgumentException; |
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use PDO; |
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use RuntimeException; |
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use Yiisoft\Mutex\MutexInterface; |
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use Yiisoft\Mutex\RetryAcquireTrait; |
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use function sha1; |
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/** |
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* MysqlMutex implements mutex "lock" mechanism via MySQL locks. |
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*/ |
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final class MysqlMutex implements MutexInterface |
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{ |
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use RetryAcquireTrait; |
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private string $name; |
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private PDO $connection; |
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/** |
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* @param string $name Mutex name. |
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* @param PDO $connection PDO connection instance to use. |
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*/ |
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public function __construct(string $name, PDO $connection) |
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{ |
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$this->name = $name; |
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$this->connection = $connection; |
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/** @var string $driverName */ |
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$driverName = $connection->getAttribute(PDO::ATTR_DRIVER_NAME); |
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if ($driverName !== 'mysql') { |
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throw new InvalidArgumentException("MySQL connection instance should be passed. Got $driverName."); |
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} |
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} |
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public function __destruct() |
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{ |
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$this->release(); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_get-lock |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_is-free-lock |
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*/ |
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public function acquire(int $timeout = 0): bool |
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{ |
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$name = $this->hashLockName(); |
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return $this->retryAcquire($timeout, function () use ($name, $timeout): bool { |
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if (!$this->isFreeLock()) { |
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return false; |
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} |
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$statement = $this->connection->prepare('SELECT GET_LOCK(:name, :timeout)'); |
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$statement->bindValue(':name', $name); |
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$statement->bindValue(':timeout', $timeout); |
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$statement->execute(); |
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return (bool) $statement->fetchColumn(); |
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}); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_release-lock |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_is-free-lock |
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*/ |
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public function release(): void |
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{ |
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if ($this->isFreeLock()) { |
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return; |
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} |
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$statement = $this->connection->prepare('SELECT RELEASE_LOCK(:name)'); |
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$statement->bindValue(':name', $this->hashLockName()); |
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$statement->execute(); |
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if (!$statement->fetchColumn()) { |
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throw new RuntimeException("Unable to release lock \"$this->name\"."); |
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} |
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} |
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/** |
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* Generates hash for the lock name to avoid exceeding lock name length limit. |
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* |
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* @return string The generated hash for the lock name. |
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* |
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* @see https://github.com/yiisoft/yii2/pull/16836 |
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*/ |
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private function hashLockName(): string |
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{ |
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return sha1($this->name); |
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} |
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/** |
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* Checks whether the lock is free to use (that is, not locked). |
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* |
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* @return bool Whether the lock is free to use. |
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* |
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* @see https://dev.mysql.com/doc/refman/8.0/en/locking-functions.html#function_is-free-lock |
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*/ |
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private function isFreeLock(): bool |
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{ |
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$statement = $this->connection->prepare('SELECT IS_FREE_LOCK(:name)'); |
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$statement->bindValue(':name', $this->hashLockName()); |
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$statement->execute(); |
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return (bool) $statement->fetchColumn(); |
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} |
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} |
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yiisoft /
mutex-pdo-mysql
