def handle_message_lockedtransfer(raiden: RaidenService,
message: LockedTransfer) -> None:
secrethash = message.lock.secrethash
# We must check if the secret was registered against the latest block,
# even if the block is forked away and the transaction that registers
# the secret is removed from the blockchain. The rationale here is that
# someone else does know the secret, regardless of the chain state, so
# the node must not use it to start a payment.
#
# For this particular case, it's preferable to use `latest` instead of
# having a specific block_hash, because it's preferable to know if the secret`
# was ever known, rather than having a consistent view of the blockchain.
registered = raiden.default_secret_registry.is_secret_registered(
secrethash=secrethash, block_identifier="latest")
if registered:
log.warning(
f"Ignoring received locked transfer with secrethash {pex(secrethash)} "
f"since it is already registered in the secret registry")
return
# TODO marcosmartinez7: unimplemented mediated transfer for light clients
is_handled_light_client = LightClientService.is_handled_lc(
to_checksum_address(message.recipient), raiden.wal)
if message.target == raiden.address:
raiden.target_mediated_transfer(message)
elif is_handled_light_client:
raiden.target_mediated_transfer_light(message)
else:
raiden.mediate_mediated_transfer(message)
