[zeromq-dev] Adding new zmq_getsockopt() to retrieve number of subscriptions from XPUB socket

[Francesco]

Hi Bill,
ok thanks, sure. I can prepare such PR... I just wanted to get a
feedback from other maintainers... I think PRs are mostly reviewed and
merged by Luca at this point right?

Luca,
what do you think about my proposal of new getsockopt to get number of
actual subscriptions?
Example usage:

/* Retrieve number of subscriptions */
int subscriptions;
size_t subscriptions_size = sizeof (subscriptions);
rc = zmq_getsockopt (socket, ZMQ_SUBSCRIPTION_COUNT, &subscriptions,
&subscriptions_size );

// NOTE: ZMQ_SUBSCRIPTION_COUNT would be applicable only to XPUB, PUB,
XSUB, SUB socket types


Thanks,
Francesco


PS: I think it would be nice to have visibility about subscriptions
added/removed also on the socket monitor... but that's a lot of more
detailed information... I think the basic use case is just to get the
whole number of subscriptions (for debugging you often know how many
subscriptions were sent and it's useful to check if any subscription
has been dropped for some reason)



Il giorno mer 16 nov 2022 alle ore 01:32 Bill Torpey
<wallstprog at gmail.com> ha scritto:
>
> Sorry Francesco — I meant your PR, I just mixed up the names.
>
> B.
>
> > On Nov 15, 2022, at 5:01 PM, Francesco <francesco.montorsi at gmail.com> wrote:
> >
> > Hi Bill,
> >
> >> Arnaud’s PR sounds useful — more visibility can only be a good thing.
> >
> > sorry I'm missing which PR you are talking about... is there an
> > existing PR to add more visibility (I'd love that)? Or you're
> > referring to the proposal I did in my first mail?
> >
> > thanks,
> > Francesco
> >
> > Il giorno mar 15 nov 2022 alle ore 22:58 Bill Torpey
> > <wallstprog at gmail.com> ha scritto:
> >>
> >> The problem with all the socket monitor stuff is that it’s async — that makes it dangerous to act on.  It’s great for monitoring/debugging -- for real-time control not so much.
> >>
> >> Arnaud’s PR sounds useful — more visibility can only be a good thing.
> >>
> >> Bill
> >>
> >>> On Nov 15, 2022, at 10:43 AM, Arnaud Loonstra <arnaud at sphaero.org> wrote:
> >>>
> >>> On 15-11-2022 15:57, Francesco wrote:
> >>>> Hi zeromq team,
> >>>> For "observability" / debugging I think it would be really really
> >>>> useful to be able to retrieve the number of subscriptions recorded by
> >>>> the 'mtrie_t' object inside a (X)PUB socket.
> >>>> Would you accept a PR adding such option?
> >>>> Thanks,
> >>>> Francesco
> >>>
> >>> Isn't that possible through the socket monitor?
> >>>
> >>> http://api.zeromq.org/4-1:zmq-socket-monitor
> >>>
> >>> Rg,
> >>>
> >>> Arnaud
> >>> _______________________________________________
> >>> zeromq-dev mailing list
> >>> zeromq-dev at lists.zeromq.org
> >>> https://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >>
> >> _______________________________________________
> >> zeromq-dev mailing list
> >> zeromq-dev at lists.zeromq.org
> >> https://lists.zeromq.org/mailman/listinfo/zeromq-dev
> > _______________________________________________
> > zeromq-dev mailing list
> > zeromq-dev at lists.zeromq.org
> > https://lists.zeromq.org/mailman/listinfo/zeromq-dev
>
> _______________________________________________
> zeromq-dev mailing list
> zeromq-dev at lists.zeromq.org
> https://lists.zeromq.org/mailman/listinfo/zeromq-dev