Re: django channels group subscriptions

You should only use the documented, public groups API - anything else will vary based on the backend you use. You will, indeed, need your own expiration logic and backend for this process stuff - an easy entry point would be one of:

- A database row per process with a timestamp bumped using keepalive-style calls

- A redis key per process with an expiry bumped using keepalive-style calls

This will probably be the most reliable thing as keepalive means that even if you miss a disconnect event, it'll shut down eventually (the tradeoff being that you might miss several keepalives and then shut it down early)

Andrew

On Thu, Jun 1, 2017 at 9:26 PM, Brian May <brian@microcomaustralia.com.au> wrote:

On Friday, 2 June 2017 14:08:40 UTC+10, Andrew Godwin wrote:

I don't have any direct examples to hand - and this sort of thing does come all the time, but much like Django is not in the business of including a full CMS, Channels can't add lots of high-level features without really narrowing the usage - it's a general framework for you to build something on.

I am not sure I can how how to do this expiration myself.

inmemory.ChannelLayer has a _clean_expired() method that looks like it will look for all outgoing messages that haven't been sent before expiring. However it looks like my application, being a layer on top of groups doesn't have access to any of this information.

So maybe I need to put some sort of keep alive mechanism in place, and completely ignore this existing expiration mechanism?

Thanks

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