def execute_route(self, meta_data, request_pdu):
""" Execute configured route based on requests meta data and request
PDU.
:param meta_data: A dict with meta data. It must at least contain
key 'unit_id'.
:param request_pdu: A bytearray containing request PDU.
:return: A bytearry containing reponse PDU.
"""
try:
function = create_function_from_request_pdu(request_pdu)
results =\
function.execute(meta_data['unit_id'], self.server.route_map)
try:
# ReadFunction's use results of callbacks to build response
# PDU...
return function.create_response_pdu(results)
except TypeError:
# ...other functions don't.
return function.create_response_pdu()
except ModbusError as e:
function_code = get_function_code_from_request_pdu(request_pdu)
return pack_exception_pdu(function_code, e.error_code)
except Exception as e:
log.exception('Could not handle request: {0}.'.format(e))
function_code = get_function_code_from_request_pdu(request_pdu)
return pack_exception_pdu(function_code,
ServerDeviceFailureError.error_code)
def execute_route(self, meta_data, request_pdu):
""" Execute configured route based on requests meta data and request
PDU.
:param meta_data: A dict with meta data. It must at least contain
key 'unit_id'.
:param request_pdu: A bytearray containing request PDU.
:return: A bytearry containing reponse PDU.
"""
try:
function = create_function_from_request_pdu(request_pdu)
results =\
function.execute(meta_data['unit_id'], self.route_map)
try:
# ReadFunction's use results of callbacks to build response
# PDU...
return function.create_response_pdu(results)
except TypeError:
# ...other functions don't.
return function.create_response_pdu()
except ModbusError as e:
function_code = get_function_code_from_request_pdu(request_pdu)
return pack_exception_pdu(function_code, e.error_code)
except Exception as e:
log.exception('Could not handle request: {0}.'.format(e))
function_code = get_function_code_from_request_pdu(request_pdu)
return pack_exception_pdu(function_code,
ServerDeviceFailureError.error_code)
def test_create_function_from_request_pdu_raising_illegal_function_error():
""" Calling function with PDU containing invalid function code should result
in an IllegalFunctionError.
"""
with pytest.raises(IllegalFunctionError):
create_function_from_request_pdu(b'\x00')
def test_create_function_from_request_pdu(pdu, cls):
assert isinstance(create_function_from_request_pdu(pdu), cls)
def test_create_function_from_request_pdu_raising_illegal_function_error():
""" Calling function with PDU containing invalid function code should result
in an IllegalFunctionError.
"""
with pytest.raises(IllegalFunctionError):
create_function_from_request_pdu(b'\x00')
def test_create_function_from_request_pdu(pdu, cls):
assert isinstance(create_function_from_request_pdu(pdu), cls)
