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)
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 mock_response_function(req: Request, payload: dict, path: str):
if path is None:
buf_path = req.get_path()
else:
buf_path = path
out_req = Request(path=buf_path,
session_id=req.get_session_id(),
sender=req.get_receiver(),
receiver=req.get_sender(),
payload=payload)
self._last_response = out_req
def _respond_to(self,
req: Request,
payload: dict,
path: Optional[str] = None):
if path:
out_path = path
else:
out_path = req.get_path()
receiver = req.get_sender()
out_req = Request(out_path, req.get_session_id(), self._host_name,
receiver, payload)
self._send(out_req)
def wait_for_responses(self,
out_req: Request,
timeout: int = 5,
max_resp_count: Optional[int] = 1) -> list[Request]:
if not self._keep_queue:
self._request_queue = Queue()
else:
self._keep_queue = False
responses: list[Request] = []
timeout_time = datetime.now() + timedelta(seconds=timeout)
while timeout and datetime.now() < timeout_time:
if max_resp_count and len(
responses
) >= max_resp_count: # return responses if enough are collected
return responses
if not self._request_queue.empty():
res: Request = self._request_queue.get()
if res.get_session_id() == out_req.get_session_id(
) and out_req.get_sender() != res.get_sender():
responses.append(res)
return responses
def send_request_split(self,
path: str,
receiver: str,
payload: dict,
part_max_size: int = 30,
timeout: Optional[int] = None) -> Optional[Request]:
"""
Sends a request to all attached networks.
The request will be split into individual parts with a maximum length.
:param path: Path to send the request on
:param receiver: Receiver for the Request
:param payload: Payload to be send
:param part_max_size: Maximum size in bytes for each individual payload chunk
:param timeout: Maximum timeout to wait for an answer
:return: The response if there is any
"""
if timeout is None:
timeout = self._default_timeout
req = Request(path, None, self._hostname, receiver, payload)
session_id = req.get_session_id()
path = req.get_path()
sender = req.get_sender()
receiver = req.get_receiver()
payload_str = json.dumps(req.get_payload())
# Make string ready to be contained in json itself
payload_str = payload_str.replace('"', "$*$")
payload_len = len(payload_str)
parts = []
start = 0
package_index = 0
while start < payload_len:
end = start + part_max_size
payload_part = payload_str[start:(
end if end < payload_len else payload_len)]
parts.append(payload_part)
start = end
last_index = len(parts)
for payload_part in parts:
out_dict = {
"package_index": package_index,
"split_payload": payload_part
}
if package_index == 0:
out_dict["last_index"] = last_index
out_req = Request(path, session_id, sender, receiver, out_dict)
if package_index == last_index - 1:
responses = self._send_request_obj(out_req, timeout, 1)
if not responses:
return None
return responses[0]
else:
self._send_request_obj(out_req, 0, 0)
package_index += 1
sleep(0.1)
return None
