Cancelling a subscription

[robiwano]

It seems it's not possible to cancel a avanza.subscription_id. The following code shows this. Idea is that task is created with ensure_future, and then cancelled after ten seconds. The subscription data continues to pour in after this.

import asyncio
from avanza import Avanza, ChannelType
import signal

user = ...
passw = ...
totpSecret = ...


def callback(data):
    # Do something with the quotes data here
    print(data)


async def subscribe_to_channel(avanza: Avanza):
    await avanza.subscribe_to_id(
        ChannelType.QUOTES,
        "19002",  # OMX Stockholm 30
        callback)


def cancel_request(unused_signum, unused_frame):
    asyncio.get_event_loop().stop()


async def cancel_task(task: asyncio.Task):
    await asyncio.sleep(10.0)
    print("Cancelling task " + task.get_name())
    task.cancel()


def main():
    signal.signal(signal.SIGINT, cancel_request)

    avanza = Avanza({
        'username': user,
        'password': passw,
        'totpSecret': totpSecret
    })

    task = asyncio.ensure_future(subscribe_to_channel(avanza))
    task.set_name("Subscription")

    asyncio.ensure_future(cancel_task(task))

    asyncio.get_event_loop().run_forever()
    print("Loop stopped")


if __name__ == "__main__":
    main()

[robiwano]

Meanwhile I'll follow the suggestion to have a publish/subscribe proxy.

[ridulfo]

Hello @robiwano Did you solve the problem, and if so how? I saw that this library provides a function called _disconnect().

[robiwano]

Unfortunately not.

[vonDassendorf]

adding this function to the socket and then calling it from Avanza class with a wrapper method should do the trick:

async def __socket_unsubscribe(
        self,
        subscription_string
    ):
        await self.__send({
            'channel': '/meta/unsubscribe',
            'clientId': self._client_id,
            'subscription': subscription_string
        })

I haven't tested this yet but that is how fhqvist is doing it in his javascript wrapper.

[Qluxzz]

I'm not all that up to speed with async in Python and I haven't had time to really test it but I've created a draft with the functionality added if any of you could try it out and reiterate upon it if needed.

https://github.com/Qluxzz/avanza/pull/30