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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Mutex; |
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use PDO; |
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use RuntimeException; |
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/** |
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* PgsqlMutex implements mutex "lock" mechanism via PgSQL locks. |
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*/ |
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final class PgsqlMutex 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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private bool $released = false; |
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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 = $connection; |
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$driverName = $connection->getAttribute(PDO::ATTR_DRIVER_NAME); |
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if ($driverName !== 'pgsql') { |
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throw new \InvalidArgumentException( |
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'Connection must be configured to use PgSQL database. Got ' . $driverName . '.' |
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); |
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} |
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} |
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public function __destruct() |
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{ |
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if (!$this->released) { |
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$this->release(); |
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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 http://www.postgresql.org/docs/9.0/static/functions-admin.html |
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*/ |
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public function acquire(int $timeout = 0): bool |
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{ |
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[$key1, $key2] = $this->getKeysFromName($this->name); |
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return $this->retryAcquire($timeout, function () use ($key1, $key2) { |
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$statement = $this->connection->prepare('SELECT pg_try_advisory_lock(:key1, :key2)'); |
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$statement->bindValue(':key1', $key1); |
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$statement->bindValue(':key2', $key2); |
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$statement->execute(); |
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if ($statement->fetchColumn()) { |
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$this->released = false; |
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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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/** |
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* {@inheritdoc} |
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* |
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* @see http://www.postgresql.org/docs/9.0/static/functions-admin.html |
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*/ |
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public function release(): void |
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{ |
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[$key1, $key2] = $this->getKeysFromName($this->name); |
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$statement = $this->connection->prepare('SELECT pg_advisory_unlock(:key1, :key2)'); |
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$statement->bindValue(':key1', $key1); |
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$statement->bindValue(':key2', $key2); |
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$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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$this->released = true; |
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} |
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/** |
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* Converts a string into two 16 bit integer keys using the SHA1 hash function. |
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* |
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* @param string $name |
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* |
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* @return array contains two 16 bit integer keys |
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*/ |
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private function getKeysFromName(string $name): array |
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{ |
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return array_values(unpack('n2', sha1($name, true))); |
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} |
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} |
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yiisoft /
mutex-pdo-pgsql
