def handle_send_refundtransfer(
        raiden: 'RaidenService',
        refund_transfer_event: SendRefundTransfer):
    refund_transfer_message = RefundTransfer.from_event(refund_transfer_event)
    raiden.sign(refund_transfer_message)
    raiden.send_async(
        refund_transfer_event.recipient,
        refund_transfer_message,
    )
def message_from_sendevent(send_event: SendMessageEvent) -> Message:
    if type(send_event) == SendLockedTransfer:
        assert isinstance(send_event, SendLockedTransfer), MYPY_ANNOTATION
        message = LockedTransfer.from_event(send_event)
    elif type(send_event) == SendLockedTransferLight:
        assert isinstance(send_event, SendLockedTransferLight), MYPY_ANNOTATION
        message = send_event.signed_locked_transfer
    elif type(send_event) == SendSecretReveal:
        assert isinstance(send_event, SendSecretReveal), MYPY_ANNOTATION
        message = RevealSecret.from_event(send_event)
    elif type(send_event) == SendSecretRevealLight:
        assert isinstance(send_event, SendSecretRevealLight), MYPY_ANNOTATION
        message = send_event.signed_secret_reveal
    elif type(send_event) == SendBalanceProof:
        assert isinstance(send_event, SendBalanceProof), MYPY_ANNOTATION
        message = Unlock.from_event(send_event)
    elif type(send_event) == SendBalanceProofLight:
        assert isinstance(send_event, SendBalanceProofLight), MYPY_ANNOTATION
        message = send_event.signed_balance_proof
    elif type(send_event) == SendSecretRequest:
        assert isinstance(send_event, SendSecretRequest), MYPY_ANNOTATION
        message = SecretRequest.from_event(send_event)
    elif type(send_event) == SendSecretRequestLight:
        assert isinstance(send_event, SendSecretRequestLight), MYPY_ANNOTATION
        message = send_event.signed_secret_request
    elif type(send_event) == SendRefundTransfer:
        assert isinstance(send_event, SendRefundTransfer), MYPY_ANNOTATION
        message = RefundTransfer.from_event(send_event)
    elif type(send_event) == SendLockExpired:
        assert isinstance(send_event, SendLockExpired), MYPY_ANNOTATION
        message = LockExpired.from_event(send_event)
    elif type(send_event) == SendProcessed:
        assert isinstance(send_event, SendProcessed), MYPY_ANNOTATION
        message = Processed.from_event(send_event)
    else:
        raise ValueError(f"Unknown event type {send_event}")

    return message