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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Cosray\Queue; |
| 6 | |
| 7 | use Celema\Quma\Connection; |
| 8 | use Closure; |
| 9 | use PDO; |
| 10 | use Pdo\Pgsql; |
| 11 | |
| 12 | /** |
| 13 | * Waits for jobs to be pushed. Pushing a job notifies the `cosray_jobs` |
| 14 | * channel once its transaction commits; the listener receives it on a |
| 15 | * connection of its own, opened on first use. |
| 16 | * |
| 17 | * @internal |
| 18 | */ |
| 19 | final class Listener |
| 20 | { |
| 21 | public const string CHANNEL = 'cosray_jobs'; |
| 22 | |
| 23 | private ?Pgsql $pdo = null; |
| 24 | |
| 25 | /** @param Closure(): Pgsql $connect */ |
| 26 | public function __construct( |
| 27 | private readonly Closure $connect, |
| 28 | ) {} |
| 29 | |
| 30 | public static function fromConnection(Connection $connection): self |
| 31 | { |
| 32 | $config = $connection->config; |
| 33 | |
| 34 | return new self(static fn(): Pgsql => new Pgsql( |
| 35 | $config->dsn, |
| 36 | $config->pdo->username, |
| 37 | $config->pdo->password, |
| 38 | $config->pdo->effectiveOptions($config->driver), |
| 39 | )); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Waits until a job is pushed or the time is up, and returns whether |
| 44 | * one was pushed. A signal ends the wait early. |
| 45 | */ |
| 46 | public function wait(float $seconds): bool |
| 47 | { |
| 48 | $pdo = $this->pdo ?? $this->listen(); |
| 49 | $this->pdo = $pdo; |
| 50 | |
| 51 | if ($pdo->getNotify(PDO::FETCH_ASSOC, max(0, (int) ceil($seconds * 1000))) === false) { |
| 52 | return false; |
| 53 | } |
| 54 | |
| 55 | // One wake-up serves every job pushed meanwhile. |
| 56 | do { |
| 57 | $more = $pdo->getNotify(PDO::FETCH_ASSOC); |
| 58 | } while ($more !== false); |
| 59 | |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | private function listen(): Pgsql |
| 64 | { |
| 65 | $pdo = ($this->connect)(); |
| 66 | $pdo->exec('LISTEN ' . self::CHANNEL); |
| 67 | |
| 68 | return $pdo; |
| 69 | } |
| 70 | } |