'Cannot run the event loop while another loop is running') RuntimeError websockets?

Question

import asyncio
    import json
    import websockets
    from mongodb import *


    class WebSocketRequest:
        def __init__(self, websocket):
            self.websocket = websocket

        async def login(self):
            data = await self.websocket.recv()
            j = json.loads(data)
            for i in j:
                if i == 'email':
                    email = j[i]
                if i == "pass":
                    password = j[i]
            user = users.find_one({"email":email})
            if user == None:
                msg = 400
            else:
                msg = 200
            await websocket.send(str(msg))

        async def register(self):
            data = await self.websocket.recv()
            j = json.loads(data)
            print(j)

        async def run(self):

            loop = asyncio.new_event_loop()
            asyncio.set_event_loop(loop)
            asyncio.ensure_future(self.login())
            asyncio.ensure_future(self.register())
            loop.run_forever()

    class WebsocketServer:
        def __init__(self, localhost,port):
            self.localhost = localhost
            self.port = port


        async def hello(self, websocket, path):
            req = WebSocketRequest(websocket)
            await req.run()

        def run(self):
            print("opening")
            loop = asyncio.new_event_loop()
            asyncio.set_event_loop(loop)

            start_server = websockets.serve(self.hello, self.localhost, self.port)

            asyncio.get_event_loop().run_until_complete(start_server)
            asyncio.get_event_loop().run_forever()
    if __name__=='__main__':
        localhost, port = '127.0.0.1', 5678
        web = WebsocketServer(localhost, port)
        web.run()

I'm trying to build a chat-app server using WebSockets. I have 3 methods - login, register and chat. I check if a user login or not and redirect him to register in a front end. I am trying to run 3 methods in one script using classes. I got an error message because there 2 loops run.
What is the problem in my code?

Diaf Badreddine · Accepted Answer · 2020-05-17 04:58:05Z

8

Before your code just write those lines

!pip install nest_asyncio
import nest_asyncio
nest_asyncio.apply()

edited May 17, 2020 at 4:58

answered May 17, 2020 at 4:45

Diaf Badreddine

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sub_o · Accepted Answer · 2018-04-06 00:54:39Z

7

It might not be possible. Guido van Rossum stated before that he didn't want recursive event loops And it seems like you're creating a nested event loops

answered Apr 6, 2018 at 0:54

sub_o

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