[jdev] MUC Presence: force history even if already joined

[Dave Cridland]

On 26 Mar 2014 20:59, "Waqas Hussain" <waqas20 at gmail.com> wrote:
>
> On Wed, Mar 26, 2014 at 2:05 PM, Dave Cridland <dave at cridland.net> wrote:
> >
> > On 26 Mar 2014 17:49, "Daniel Dormont" <dan at greywallsoftware.com> wrote:
> >> I have a use case where I would like to send a presence to a MUC that
> >> I may have already joined and, even if I have, I want it to send me
> >> the message history no matter what. Is there a way to do that or would
> >> it require a protocol extension of some sort?
> >
> > Yes and no.
> >
> > Technically speaking, simply sending presence to a MUC and joining (thus
> > getting the history and participants) are not the same thing. Sending a
> > proper MUC join (with the <x/> and the history control optionally
inside it)
> > to M-Link[*] will, therefore, give you the history you asked for, and
all
> > the occupant presence, even if you're already in the room.
> >
> > I find this *extremely* useful - which is why I did things that way. A
> > use-case for this is where an S2S link is down when you reconnect your
C2S,
> > or the server crashes, or ... - all arguably edge cases, but they're
solved
> > very nicely this way.
> >
> > Other servers don't do this, though - I think they should.
> >
> > If you wanted to avoid the occupant presence, you'd want an extension
which
> > signalled this in much the same way that the history controls work.
> >
> > Dave.
> > --
> > * - Note that I left Isode over a year ago and so may well be out of
date.
> >
>
> Prosody was (AFAIK) the first server to do this. We specifically
> checked for <x xmlns=muc>, and assumed it was a MUC join, even if the
> user was already in the room. It worked wonderfully, but we had to
> comment that out because of Gtalk resending directed presence every
> few minutes.
>

Yeah, I decided at the time correct  behaviour over flakey links was more
important than supporting buggy servers.

I suppose it could have been made an option, in retrospect, but I did
really appreciate the support on internet servers too.

> Did Google ever fix that? Or do Gtalk users joining M-Link chatrooms
> get history sent over and over? We never removed the code from Prosody
> in the hope that Google would fix their behavior and we would reenable
> the feature.
>

I've no idea. I know it was quite irritating for a while use a Google
account with an M-Link chatroom.

> --
> Waqas Hussain
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