def from_pb(cls, obj, public_key: str, crypto: Crypto) -> 'Request':
"""
Parse a string of bytes associated to a request message to the TAC controller.
:param obj: the string of bytes to be parsed.
:param public_key: the public key of the request sender.
:param crypto: the Crypto object
:raises TacError: if the string of bytes cannot be parsed as a Response from the TAC Controller.
:return: a :class:`~tac.protocol.Response` object.
"""
signed_msg = tac_pb2.TACAgent.SignedMessage()
signed_msg.ParseFromString(obj)
if crypto.is_confirmed_integrity(signed_msg.message,
signed_msg.signature, public_key):
msg = tac_pb2.TACAgent.Message()
msg.ParseFromString(signed_msg.message)
case = msg.WhichOneof("msg")
if case == "register":
return Register.from_pb(msg.register, public_key, crypto)
elif case == "unregister":
return Unregister(public_key, crypto)
elif case == "transaction":
return Transaction.from_pb(msg.transaction, public_key, crypto)
elif case == "get_state_update":
return GetStateUpdate(public_key, crypto)
else:
raise TacError("Unrecognized type of Request.")
else:
raise ValueError("Bad signature. Do not trust!")
def from_pb(cls, obj, public_key: str, crypto: Crypto) -> 'Response':
"""
Parse a string of bytes associated to a response message from the TAC controller.
:param obj: the string of bytes to be parsed.
:param public_key: the public key of the recipient.
:param crypto: the crypto module
:raises TacError: if the string of bytes cannot be parsed as a Response from the TAC Controller.
:return: a :class:`~tac.protocol.Response` object.
"""
try:
signed_msg = tac_pb2.TACAgent.SignedMessage()
signed_msg.ParseFromString(obj)
if crypto.is_confirmed_integrity(signed_msg.message,
signed_msg.signature, public_key):
msg = tac_pb2.TACController.Message()
msg.ParseFromString(signed_msg.message)
case = msg.WhichOneof("msg")
if case == "cancelled":
return Cancelled(public_key, crypto)
elif case == "game_data":
return GameData.from_pb(msg.game_data, public_key, crypto)
elif case == "tx_confirmation":
return TransactionConfirmation(
public_key, crypto, msg.tx_confirmation.transaction_id)
elif case == "state_update":
return StateUpdate.from_pb(msg.state_update, public_key,
crypto)
elif case == "error":
return Error.from_pb(msg.error, public_key, crypto)
else:
raise TacError("Unrecognized type of Response.")
else:
raise ValueError("Bad signature. Do not trust!")
except DecodeError as e:
logger.exception(str(e))
raise TacError("Error in decoding the message.")