def handle_transferrefundcancelroute(
payment_state: InitiatorPaymentState,
state_change: ReceiveTransferRefundCancelRoute,
channelidentifiers_to_channels: typing.ChannelMap,
pseudo_random_generator: random.Random,
block_number: typing.BlockNumber,
) -> TransitionResult:
channel_identifier = payment_state.initiator.channel_identifier
channel_state = channelidentifiers_to_channels[channel_identifier]
refund_transfer = state_change.transfer
original_transfer = payment_state.initiator.transfer
is_valid_lock = (
refund_transfer.lock.secrethash == original_transfer.lock.secrethash
and refund_transfer.lock.amount == original_transfer.lock.amount and
refund_transfer.lock.expiration == original_transfer.lock.expiration)
is_valid_refund = channel.refund_transfer_matches_received(
refund_transfer,
original_transfer,
)
events = list()
if is_valid_lock and is_valid_refund:
is_valid, channel_events, _ = channel.handle_receive_refundtransfercancelroute(
channel_state,
refund_transfer,
)
events.extend(channel_events)
if is_valid:
old_description = payment_state.initiator.transfer_description
transfer_description = TransferDescriptionWithSecretState(
old_description.payment_network_identifier,
old_description.payment_identifier,
old_description.amount,
old_description.token_network_identifier,
old_description.initiator,
old_description.target,
state_change.secret,
)
payment_state.initiator.transfer_description = transfer_description
sub_iteration = handle_cancelroute(
payment_state,
state_change,
channelidentifiers_to_channels,
pseudo_random_generator,
block_number,
)
events.extend(sub_iteration.events)
if sub_iteration.new_state is None:
payment_state = None
iteration = TransitionResult(payment_state, events)
return iteration
def handle_transferrefundcancelroute(
payment_state: InitiatorPaymentState,
state_change: ReceiveTransferRefundCancelRoute,
channelidentifiers_to_channels: ChannelMap,
pseudo_random_generator: random.Random,
block_number: BlockNumber,
) -> TransitionResult[InitiatorPaymentState]:
initiator_state = payment_state.initiator_transfers.get(
state_change.transfer.lock.secrethash)
if not initiator_state:
return TransitionResult(payment_state, list())
channel_identifier = initiator_state.channel_identifier
channel_state = channelidentifiers_to_channels.get(channel_identifier)
if not channel_state:
return TransitionResult(payment_state, list())
refund_transfer = state_change.transfer
original_transfer = initiator_state.transfer
is_valid_lock = (
refund_transfer.lock.secrethash == original_transfer.lock.secrethash
and refund_transfer.lock.amount == original_transfer.lock.amount and
refund_transfer.lock.expiration == original_transfer.lock.expiration)
is_valid_refund = channel.refund_transfer_matches_transfer(
refund_transfer, original_transfer)
events = list()
if not is_valid_lock or not is_valid_refund:
return TransitionResult(payment_state, list())
is_valid, channel_events, _ = channel.handle_receive_refundtransfercancelroute(
channel_state, refund_transfer)
events.extend(channel_events)
if not is_valid:
return TransitionResult(payment_state, list())
route_failed_event = EventRouteFailed(
secrethash=original_transfer.lock.secrethash)
events.append(route_failed_event)
old_description = initiator_state.transfer_description
transfer_description = TransferDescriptionWithSecretState(
payment_network_identifier=old_description.payment_network_identifier,
payment_identifier=old_description.payment_identifier,
amount=old_description.amount,
token_network_identifier=old_description.token_network_identifier,
allocated_fee=old_description.allocated_fee,
initiator=old_description.initiator,
target=old_description.target,
secret=state_change.secret,
)
sub_iteration = maybe_try_new_route(
payment_state=payment_state,
initiator_state=initiator_state,
transfer_description=transfer_description,
available_routes=state_change.routes,
channelidentifiers_to_channels=channelidentifiers_to_channels,
pseudo_random_generator=pseudo_random_generator,
block_number=block_number,
)
events.extend(sub_iteration.events)
iteration = TransitionResult(payment_state, events)
return iteration
def handle_transferrefundcancelroute(
payment_state: InitiatorPaymentState,
state_change: ReceiveTransferRefundCancelRoute,
channelidentifiers_to_channels: initiator.ChannelMap,
pseudo_random_generator: random.Random,
block_number: typing.BlockNumber,
) -> TransitionResult:
channel_identifier = payment_state.initiator.channel_identifier
channel_state = channelidentifiers_to_channels[channel_identifier]
refund_transfer = state_change.transfer
original_transfer = payment_state.initiator.transfer
if channel_state.close_transaction:
closed_block_number = channel_state.close_transaction.finished_block_number
else:
closed_block_number = None
# This is overcommiting, since the initiator knows the secret it doesn't
# need to wait for reveal_timeout blocks.
timeout_blocks = mediator.get_timeout_blocks(
channel_state.settle_timeout,
closed_block_number,
original_transfer.lock.expiration,
block_number,
)
lock_timeout = timeout_blocks - channel_state.reveal_timeout
maximum_expiration = lock_timeout + block_number
is_valid_lock = (
refund_transfer.lock.secrethash == original_transfer.lock.secrethash and
refund_transfer.lock.amount == original_transfer.lock.amount and
refund_transfer.lock.expiration <= maximum_expiration
)
is_valid_refund = channel.refund_transfer_matches_received(
refund_transfer,
original_transfer,
)
events = list()
if is_valid_lock and is_valid_refund:
is_valid, channel_events, _ = channel.handle_receive_refundtransfercancelroute(
channel_state,
refund_transfer,
)
events.extend(channel_events)
if is_valid:
old_description = payment_state.initiator.transfer_description
transfer_description = TransferDescriptionWithSecretState(
old_description.payment_identifier,
old_description.amount,
old_description.token_network_identifier,
old_description.initiator,
old_description.target,
state_change.secret,
)
payment_state.initiator.transfer_description = transfer_description
sub_iteration = handle_cancelroute(
payment_state,
state_change,
channelidentifiers_to_channels,
pseudo_random_generator,
block_number,
)
events.extend(sub_iteration.events)
if sub_iteration.new_state is None:
payment_state = None
iteration = TransitionResult(payment_state, events)
return iteration
def handle_transferrefundcancelroute(
payment_state: InitiatorPaymentState,
state_change: ReceiveTransferRefundCancelRoute,
channelidentifiers_to_channels: initiator.ChannelMap,
pseudo_random_generator: random.Random,
block_number: typing.BlockNumber,
) -> TransitionResult:
channel_identifier = payment_state.initiator.channel_identifier
channel_state = channelidentifiers_to_channels[channel_identifier]
refund_transfer = state_change.transfer
original_transfer = payment_state.initiator.transfer
maximum_expiration = original_transfer.lock.expiration - channel_state.reveal_timeout
if channel_state.close_transaction:
closed_block_number = channel_state.close_transaction.finished_block_number
else:
closed_block_number = None
# This is overcommiting, since the initiator knows the secret it doesn't
# need to wait for reveal_timeout blocks.
timeout_blocks = mediator.get_timeout_blocks(
channel_state.settle_timeout,
closed_block_number,
original_transfer.lock.expiration,
block_number,
)
lock_timeout = timeout_blocks - channel_state.reveal_timeout
maximum_expiration = lock_timeout + block_number
is_valid_lock = (
refund_transfer.lock.secrethash == original_transfer.lock.secrethash
and refund_transfer.lock.amount == original_transfer.lock.amount
and refund_transfer.lock.expiration <= maximum_expiration)
is_valid_refund = mediator.is_valid_refund(
original_transfer,
refund_transfer,
)
events = list()
if is_valid_lock and is_valid_refund:
is_valid, channel_events, _ = channel.handle_receive_refundtransfercancelroute(
channel_state,
refund_transfer,
)
events.extend(channel_events)
if is_valid:
old_description = payment_state.initiator.transfer_description
transfer_description = TransferDescriptionWithSecretState(
old_description.payment_identifier,
old_description.amount,
old_description.token_network_identifier,
old_description.initiator,
old_description.target,
state_change.secret,
)
payment_state.initiator.transfer_description = transfer_description
sub_iteration = handle_cancelroute(
payment_state,
state_change,
channelidentifiers_to_channels,
pseudo_random_generator,
block_number,
)
events.extend(sub_iteration.events)
if sub_iteration.new_state is None:
payment_state = None
iteration = TransitionResult(payment_state, events)
return iteration
def handle_transferrefundcancelroute(
payment_state: InitiatorPaymentState,
state_change: ReceiveTransferRefundCancelRoute,
channelidentifiers_to_channels: ChannelMap,
pseudo_random_generator: random.Random,
block_number: BlockNumber,
) -> TransitionResult:
channel_identifier = payment_state.initiator.channel_identifier
channel_state = channelidentifiers_to_channels[channel_identifier]
refund_transfer = state_change.transfer
original_transfer = payment_state.initiator.transfer
is_valid_lock = (
refund_transfer.lock.secrethash == original_transfer.lock.secrethash and
refund_transfer.lock.amount == original_transfer.lock.amount and
refund_transfer.lock.expiration == original_transfer.lock.expiration
)
is_valid_refund = channel.refund_transfer_matches_received(
refund_transfer,
original_transfer,
)
events = list()
if is_valid_lock and is_valid_refund:
is_valid, channel_events, _ = channel.handle_receive_refundtransfercancelroute(
channel_state,
refund_transfer,
)
events.extend(channel_events)
if is_valid:
old_description = payment_state.initiator.transfer_description
transfer_description = TransferDescriptionWithSecretState(
old_description.payment_network_identifier,
old_description.payment_identifier,
old_description.amount,
old_description.token_network_identifier,
old_description.initiator,
old_description.target,
state_change.secret,
)
payment_state.initiator.transfer_description = transfer_description
sub_iteration = handle_cancelroute(
payment_state,
state_change,
channelidentifiers_to_channels,
pseudo_random_generator,
block_number,
)
events.extend(sub_iteration.events)
if sub_iteration.new_state is None:
payment_state = None
iteration = TransitionResult(payment_state, events)
return iteration