def mock_receive(self, path: str, sender: str, payload: dict):
buf_req = Request(path,
None,
sender,
self._hostname,
payload)
buf_req.set_callback_method(self._get_mock_response_function())
self.receive(buf_req)
class RestServerRequestManager:
_request: Request
_response: Optional[Request]
def __init__(self, hostname: str, path: str, payload: dict,
auth: Optional[AuthContainer]):
self._response = None
self._create_incoming_request(hostname, path, payload, auth)
def __del__(self):
pass
def _create_incoming_request(self, hostname: str, path: str, payload: dict,
auth: Optional[AuthContainer]):
session_id = random.randint(0, 30000)
sender = f"rest_client_{session_id}"
self._request = Request(path=path,
session_id=session_id,
sender=sender,
receiver=hostname,
payload=payload)
if auth is not None:
self._request.set_auth(auth)
self._request.set_callback_method(self._get_response_function())
def _get_response_function(self) -> response_callback_type:
def respond(req: Request, payload: dict, path: Optional[str]):
if req.get_session_id() != self._request.get_session_id():
raise IllegalResponseException(
f"Session IDs {req.get_session_id()} and "
f"{self._request.get_session_id()} are not matching")
if path is not None:
res_path = path
else:
res_path = req.get_path()
self._response = Request(path=res_path,
session_id=req.get_session_id(),
sender=self._request.get_receiver(),
receiver=req.get_sender(),
payload=payload)
return respond
def get_request(self) -> Request:
return self._request
def await_response(self, timeout: int = 2) -> Request:
start_time = datetime.now()
while self._response is None:
time.sleep(0.1)
now = datetime.now()
if now > (start_time + timedelta(seconds=timeout)):
break
if self._response is None:
raise NoResponseReceivedError(self._request.get_path())
return self._response
def _handle_split_request(self,
received_request: Request) -> Optional[Request]:
req_payload = received_request.get_payload()
id_str = str(received_request.get_session_id())
p_index = req_payload["package_index"]
split_payload = req_payload["split_payload"]
if p_index == 0:
if "last_index" in req_payload:
l_index = req_payload["last_index"]
buf_json = {
"start_req": received_request,
"last_index": l_index,
"payload_bits": []
}
for i in range(l_index + 1):
buf_json["payload_bits"].append(None)
buf_json["payload_bits"][0] = split_payload
self._part_data[id_str] = buf_json
else:
self._logger.error(
"Received first block of split request without last_index")
else:
if id_str in self._part_data:
req_data = self._part_data[id_str]
req_data["payload_bits"][p_index] = split_payload
if p_index >= req_data["last_index"] - 1:
# TODO: Split requests should be recognized whether the last package is received last or not
end_data = ""
for str_data in req_data["payload_bits"]:
if str_data is None:
self._logger.error(
"Detected missing data block in split request")
break
end_data += str_data
try:
end_data = end_data.replace("$*$", '"')
json_data = json.loads(end_data)
first_req: Request = req_data["start_req"]
out_req = Request(first_req.get_path(),
first_req.get_session_id(),
first_req.get_sender(),
first_req.get_receiver(), json_data)
out_req.set_callback_method(first_req.get_callback())
del self._part_data[id_str]
return out_req
except json.decoder.JSONDecodeError:
self._logger.error("Received illegal payload")
else:
self._logger.error(
"Received a followup-block with no entry in storage")
return None
def buf_callback(client, userdata, message):
"""Callback to attach to mqtt object, mqtt_res_queue gets catched in closure"""
topic = message.topic
try:
json_str = message.payload.decode("utf-8")
except UnicodeDecodeError:
self._logger.warning("Couldn't format json string")
return
try:
body = json.loads(json_str)
except json.decoder.JSONDecodeError:
self._logger.warning(
"Couldn't decode json: '{}'".format(json_str))
return
try:
self._validator.validate(body, REQ_VALIDATION_SCHEME_NAME)
except ValidationError:
self._logger.warning(
"Could not decode Request, Schema Validation failed.")
topic_without_channel = topic[len(self._channel):].strip("/")
try:
inc_req = Request(topic_without_channel,
body["session_id"],
body["sender"],
body["receiver"],
body["payload"],
connection_type=f"MQTT")
inc_req.set_auth(MqttAuthContainer())
inc_req.set_callback_method(self._respond_to)
self._add_req_to_queue(inc_req)
except ValueError:
self._logger.error("Error creating Request")
