jdev - 2023-07-22

Does an muc send recent messages to a user that just joined? I was amazed to find history in an muc I just joined even though no MAM request was sent.

atomicwatch: yes, unless you ask it not to

got it thanks

You can also ask for a certain number of messages or messages since some time

MAM allows for pagination and other optimizations, but it's never been needed just to get room history

That's the "old" history method. Most clients disable it in favour of using MAM these days.

lovetox: "can i express a tuple like (100, -1) in one database field?" -- you can pack the value yourself by shifting 'zero' up to the middle of the range for the signed part, e.g. https://dpaste.org/zJF3v

thanks theTedd will check it out

is it possible to query the last message in a mam archive?

https://xmpp.org/extensions/xep-0313.html#sect-idm46703187351248 like that?

max=1 you want only the very last single message

ah great thanks

There is also https://xmpp.org/extensions/xep-0313.html#archive-metadata if you just want the id

It's newer though, so not as widely deployed as original MAM stuff

yes thats exactly what i wanted

the question is for me though, its hard to do this without races

i join a muc, now i send the query for the state of the archiv

while this is in flight, new messages arrive

With bind2 you get this automatically pushed to you to avoid the race. You're right that we need to do same with MUC.

I've been thinking that we ought to have something in the join stanza to indicate MUC support, better than <history maxstanzas=0> that might return some actually useful MAM info

Not sure what tho and I don't think I ever got any positive response to that, so I haven't pursued it

Yeah, the archive metadata element 🙂

yeah, that would be great

i could do something like, send the iq, and when i receive a message while the IQ is in flight, i also know the end of the archive

and simply ignore the response of the IQ

i wonder if there could be races like, that iq response has a stanza-id in it, which is not yet delivered to me

like i request the metadata, and the last stanza id is a message, that i will receive after the iq response