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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace LambdaTwelve\OneRecord\Client; |
| 6 | |
| 7 | use Psr\Http\Client\ClientExceptionInterface; |
| 8 | use Psr\Http\Client\RequestExceptionInterface; |
| 9 | use Throwable; |
| 10 | |
| 11 | /** |
| 12 | * What a host's outbox worker does after a failed delivery. Every host needs |
| 13 | * the same classification, so it lives here: transport failures and the |
| 14 | * statuses that say "not now" (5xx, 408, 429) are retried with backoff, |
| 15 | * whether they came from the notification itself or from fetching the token |
| 16 | * for it; every other HTTP answer, refused credentials, and a request PSR-18 |
| 17 | * reports as unusable are final; anything else is a defect on the sending |
| 18 | * side and not worth a retry either. |
| 19 | * |
| 20 | * Pass whatever you caught. The SDK client wraps transport failures in a |
| 21 | * ClientException with the PSR exception as its cause, so the chain of |
| 22 | * previous exceptions is walked and the first cause that says something |
| 23 | * decides. |
| 24 | */ |
| 25 | enum DeliveryVerdict |
| 26 | { |
| 27 | case Retry; |
| 28 | case Reject; |
| 29 | |
| 30 | public static function of(Throwable $failure): self |
| 31 | { |
| 32 | for ($cause = $failure; $cause !== null; $cause = $cause->getPrevious()) { |
| 33 | if ($cause instanceof OneRecordHttpException) { |
| 34 | return self::forStatus($cause->status); |
| 35 | } |
| 36 | if ($cause instanceof TokenEndpointException) { |
| 37 | return self::forStatus($cause->status); |
| 38 | } |
| 39 | if ($cause instanceof RequestExceptionInterface) { |
| 40 | // PSR-18: the request itself is unusable; repeating it unchanged cannot help (R7-008). |
| 41 | return self::Reject; |
| 42 | } |
| 43 | if ($cause instanceof ClientExceptionInterface) { |
| 44 | // A network failure, or a client that says only "failed": transient until proven otherwise. |
| 45 | return self::Retry; |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | return self::Reject; |
| 50 | } |
| 51 | |
| 52 | private static function forStatus(int $status): self |
| 53 | { |
| 54 | return $status >= 500 || $status === 408 || $status === 429 ? self::Retry : self::Reject; |
| 55 | } |
| 56 | } |