On Fri, May 18, 2018 at 10:28:00PM -0700, sahadev sahu wrote:
> Hello,
>
> I am implementing a websocket application for live data feed updates to
> each client according to their watchlist in every 5 second. Here I am
> explaining my requirement:
>
>1. Once user register with my application, he can view list of currency
>pairs e.g (ETH, BTC etc)
>2. From that list, user can add one or more pairs into his watchlist.
>3. And based on user's watchlist, user should get only that data through
>"Channel" which is in his watchlist in every 5 second
>
> Possible approach as per me:
>
>1. Should i create multiple channel for each user ? or
>2. Is there possibility to create multiple events in single channel to
>handle each user separately to send different feeds to each user
>
> Note: Every feed will fetch its results from another exchange website, then
> the end user will get that feed into their watchlist. How can i run my
> script continuously for each user seprately
>
>
> Please kindly suggest, what is the right approach to implement this kind of
> situation.
Here's one way to do it. Each channel should be associated with
a group[1]. There should be one group per User[2] associated via a
database model[3](called UserWebsocketGroup). Then you can poll the
exchange website using a background task[4] that goes something like this:
def poll_exchange_site():
user_websocket_groups = UserWebsocketGroup.objects.all()
for user_websocket_group in user_websocket_groups:
currency_pairs = user_websocket_group.user.currency_pairs.all()
for pair in currency_pairs:
pair_values = get_pair_values_from_exchange(pair)
user_websocket_group.group.send({pair: pair_values})
time.sleep(5)
poll_exchange_website()
[1] http://channels.readthedocs.io/en/latest/topics/channel_layers.html#groups
[2] https://docs.djangoproject.com/en/2.0/ref/contrib/auth/#user-model
[3] https://docs.djangoproject.com/en/2.0/topics/db/models/
[4] http://channels.readthedocs.io/en/latest/topics/worker.html#
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