from infrastructure.http_retry import TransientHttpError


class EpcApiError(Exception):
    """Base for all EPC client errors."""


class EpcNotFoundError(EpcApiError):
    """Raised when the API returns 404."""


class EpcRateLimitError(EpcApiError, TransientHttpError):
    """Raised when the API returns 429. A ``TransientHttpError`` so the shared
    ``call_with_retry`` retries it (honouring ``Retry-After``), while remaining an
    ``EpcApiError`` for callers that catch the EPC hierarchy."""