Function future_set_exception_unless_cancelled

tornado/concurrent.py:199–218

Set the given ``exc`` as the `Future`'s exception. If the Future is already canceled, logs the exception instead. If this logging is not desired, the caller should explicitly check the state of the Future and call ``Future.set_exception`` instead of this wrapper. Avoids ``async

(
    future: "Union[futures.Future[_T], Future[_T]]", exc: BaseException
)

def future_set_exception_unless_cancelled(
    future: "Union[futures.Future[_T], Future[_T]]", exc: BaseException
) -> None:
    """Set the given ``exc`` as the `Future`'s exception.

    If the Future is already canceled, logs the exception instead. If
    this logging is not desired, the caller should explicitly check
    the state of the Future and call ``Future.set_exception`` instead of
    this wrapper.

    Avoids ``asyncio.InvalidStateError`` when calling ``set_exception()`` on
    a cancelled `asyncio.Future`.

    .. versionadded:: 6.0

    """
    if not future.cancelled():
        future.set_exception(exc)
    else:
        app_log.error("Exception after Future was cancelled", exc_info=exc)


def future_set_exc_info(