def _generate_payment_channel_state_service_client(self):
grpc_channel = self._base_grpc_channel
with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
state_service_pb2_grpc = importlib.import_module(
"state_service_pb2_grpc")
return state_service_pb2_grpc.PaymentChannelStateServiceStub(
grpc_channel)
def _get_current_channel_state(self):
stub = self.payment_channel_state_service_client
current_block_number = self.web3.eth.getBlock("latest").number
message = web3.Web3.soliditySha3(["string","address","uint256","uint256"], ["__get_channel_state",web3.Web3.toChecksumAddress(self.mpe_contract.contract.address),self.channel_id,current_block_number])
signature = self.web3.eth.account.signHash(defunct_hash_message(message), self.account.signer_private_key).signature
with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
state_service_pb2 = importlib.import_module("state_service_pb2")
request = state_service_pb2.ChannelStateRequest(channel_id=web3.Web3.toBytes(self.channel_id), signature=bytes(signature),current_block=current_block_number)
response = stub.GetChannelState(request)
return int.from_bytes(response.current_nonce, byteorder="big"), int.from_bytes(response.current_signed_amount, byteorder="big")
def is_free_call_available(self, email, token_for_free_call, token_expiry_date_block, signature,
current_block_number, daemon_endpoint):
try:
with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
state_service_pb2 = importlib.import_module("state_service_pb2")
with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
state_service_pb2_grpc = importlib.import_module("state_service_pb2_grpc")
request = state_service_pb2.FreeCallStateRequest()
request.user_id = email
request.token_for_free_call = token_for_free_call
request.token_expiry_date_block = token_expiry_date_block
request.signature = signature
request.current_block = current_block_number
endpoint_object = urlparse(daemon_endpoint)
if endpoint_object.port is not None:
channel_endpoint = endpoint_object.hostname + ":" + str(endpoint_object.port)
else:
channel_endpoint = endpoint_object.hostname
if endpoint_object.scheme == "http":
channel = grpc.insecure_channel(channel_endpoint)
elif endpoint_object.scheme == "https":
channel = grpc.secure_channel(channel_endpoint, grpc.ssl_channel_credentials())
else:
raise ValueError('Unsupported scheme in service metadata ("{}")'.format(endpoint_object.scheme))
stub = state_service_pb2_grpc.FreeCallStateServiceStub(channel)
response = stub.GetFreeCallsAvailable(request)
if response.free_calls_available > 0:
return True
return False
except Exception as e:
return False
def _get_current_channel_state(self):
stub = self.payment_channel_state_service_client
message = web3.Web3.soliditySha3(["uint256"], [self.channel_id])
signature = self.web3.eth.account.signHash(
defunct_hash_message(message),
self.account.signer_private_key).signature
with add_to_path(str(RESOURCES_PATH.joinpath("proto"))):
state_service_pb2 = importlib.import_module("state_service_pb2")
request = state_service_pb2.ChannelStateRequest(
channel_id=web3.Web3.toBytes(self.channel_id),
signature=bytes(signature))
response = stub.GetChannelState(request)
return int.from_bytes(response.current_nonce,
byteorder="big"), int.from_bytes(
response.current_signed_amount,
byteorder="big")