Running into uvloop issues with Database queries from Rasa-X? - amazon-neptune

Question

I'm trying to make a simple query to my amazon neptune database, from Rasa-x.
Here is the code from my actions.py:
class ActionQueryDietary(Action):
def name(self) -> Text:
return "action_query_dietary"
def run(self, dispatcher: CollectingDispatcher, tracker: Tracker, domain: Dict[Text, Any]) -> List[Dict[Text, Any]]:
available = False
restaurant = "XXXX"
dietaryQuestion=tracker.get_slot('dietaryQuestion')
g, remoteConn = kb.openConnection()
dietary = kb.getDietary(g, restaurant, dietaryQuestion)
if(dietary=="Yes"):
available = True
if(available==True):
dispatcher.utter_message(text="According to our knowledge base, {} is on the menu").format(dietaryQuestion)
else:
dispatcher.utter_message(text="Sorry, according to our knowledge base, we don't have this option on the menu")
kb.closeConnection(remoteConn)
return []
and here is the code from knowledgebase.py:
def getDietary(g, restaurant, dietary):
properties = queryRestaurantProperties(g, restaurant)
result = properties[dietary]
print(result)
return result
but any query to the knowledgebase results in this error:
2020-10-22T18:01:22.347345241Z File "/opt/venv/lib/python3.7/site-packages/sanic/app.py", line 973, in handle_request
2020-10-22T18:01:22.347351643Z response = await response
2020-10-22T18:01:22.347357446Z File "/app/rasa_sdk/endpoint.py", line 102, in webhook
2020-10-22T18:01:22.347363522Z result = await executor.run(action_call)
2020-10-22T18:01:22.347369398Z File "/app/rasa_sdk/executor.py", line 392, in run
2020-10-22T18:01:22.347375473Z events = action(dispatcher, tracker, domain)
2020-10-22T18:01:22.347381348Z File "/app/actions/actions.py", line 33, in run
2020-10-22T18:01:22.347387063Z dietary = kb.getDietary(g, restaurant, dietaryQuestion)
2020-10-22T18:01:22.347392835Z File "/app/actions/knowledgebase.py", line 117, in getDietary
2020-10-22T18:01:22.347399112Z properties = queryRestaurantProperties(g, restaurant)
2020-10-22T18:01:22.347405111Z File "/app/actions/knowledgebase.py", line 86, in queryRestaurantProperties
2020-10-22T18:01:22.347411869Z result = g.V().has('name', restaurant).valueMap().next()
2020-10-22T18:01:22.347418048Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/process/traversal.py", line 89, in next
2020-10-22T18:01:22.347424293Z return self.__next__()
2020-10-22T18:01:22.347430069Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/process/traversal.py", line 48, in __next__
2020-10-22T18:01:22.347436333Z self.traversal_strategies.apply_strategies(self)
2020-10-22T18:01:22.347441940Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/process/traversal.py", line 573, in apply_strategies
2020-10-22T18:01:22.347447667Z traversal_strategy.apply(traversal)
2020-10-22T18:01:22.347453031Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/remote_connection.py", line 149, in apply
2020-10-22T18:01:22.347459352Z remote_traversal = self.remote_connection.submit(traversal.bytecode)
2020-10-22T18:01:22.347465069Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/driver_remote_connection.py", line 55, in submit
2020-10-22T18:01:22.347486749Z result_set = self._client.submit(bytecode)
2020-10-22T18:01:22.347493788Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/client.py", line 127, in submit
2020-10-22T18:01:22.347499424Z return self.submitAsync(message, bindings=bindings).result()
2020-10-22T18:01:22.347505093Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/client.py", line 146, in submitAsync
2020-10-22T18:01:22.347511092Z return conn.write(message)
2020-10-22T18:01:22.347516610Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/connection.py", line 55, in write
2020-10-22T18:01:22.347522673Z self.connect()
2020-10-22T18:01:22.347529987Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/connection.py", line 45, in connect
2020-10-22T18:01:22.347536097Z self._transport.connect(self._url, self._headers)
2020-10-22T18:01:22.347542222Z File "/opt/venv/lib/python3.7/site-packages/gremlin_python/driver/tornado/transport.py", line 36, in connect
2020-10-22T18:01:22.347547822Z lambda: websocket.websocket_connect(url))
2020-10-22T18:01:22.347553477Z File "/opt/venv/lib/python3.7/site-packages/tornado/ioloop.py", line 571, in run_sync
2020-10-22T18:01:22.347559295Z self.start()
2020-10-22T18:01:22.347564864Z File "/opt/venv/lib/python3.7/site-packages/tornado/platform/asyncio.py", line 132, in start
2020-10-22T18:01:22.347570978Z self.asyncio_loop.run_forever()
2020-10-22T18:01:22.347576693Z File "uvloop/loop.pyx", line 1351, in uvloop.loop.Loop.run_forever
2020-10-22T18:01:22.347582342Z File "uvloop/loop.pyx", line 484, in uvloop.loop.Loop._run
2020-10-22T18:01:22.347588222Z RuntimeError: Cannot run the event loop while another loop is running
I tried using nest_asyncio.apply, but that resulted in this error:
ValueError: Can't patch loop of type <class 'uvloop.Loop'>
which according to the docs is just a rule.
So I don't really know how to proceed?

Answer 1

Adding my comment above as an answer. In some cases it is necessary to downlevel the version of Tornado being used. There are some issues that you can sometimes run into if the event loop is already running when someone else tries to create it. For now, down leveling to Tornado 4.5.1 with Gremlin Python should resolve any issues.