jdev - 2022-01-28

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14:42:44 pep. Can somebody crash course getting disco info from accounts in roster? Caps are sent in the directed presence and it's up to the client to iq/get the resource if it wants to know? (also valid for my own other resources?)
14:43:31 Kev Correct. Get caps in presence, check against caps cache, if missing disco client, check and shove result in cache.
14:43:54 pep. ta
14:46:48 pep. What about people not in the roster? I can disco their barejid but I'm not given a fulljid unless they specifically put it in @from?
14:47:32 Zash @from on a directed presence? that'll always have their full jid there
14:47:56 jonas’ @from on any type="available" presence you receive, actually
14:48:02 pep. Do I get a directed presence from somebody not in my roster?
14:48:12 jonas’ only if they explicitly send it to you
14:48:25 pep. Do clients do that?
14:48:32 jonas’ probably not
14:48:44 pep. Ok
14:48:45 jonas’ fulljids are also found in the @from of IQs and messages though
14:49:24 pep. So if I don't get a directed presence I'm likely not getting their device capabilities
14:49:30 jonas’ correct
14:49:38 jonas’ s/likely/at all/
14:49:41 pep. Ok
14:49:53 jonas’ you'll also never notice when a device goes offline or when their capabilities change
14:50:37 Zash if you got directed presence? then the server should send you unavailable when they go offline
14:50:51 jonas’ Zash, "if I don't get a directed presence"
14:51:29 Zash ah
14:51:34 Zash well then you are in the dark
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15:27:05 goffi pep.: you can't disco bare jid if you're not in the roster (see my recent email on standard@ about that).
15:27:36 rubi > s/likely/at all/ > I'm at all not getting :P
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15:35:52 doge How do you usually go about parsing the xmpp stream? You can't just use regular DOM with it can you. Are you supposed to use SAX? But I never understood how people use SAX for anything but the simplest of documents, and from reading XEPs xmpp's structure seems to be far from simple. Any patterns/suggestions?
15:36:09 jonas’ SAX, and it's not that tricky actually
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15:36:45 jonas’ so in aioxmpp, I structure the XML events directly into python objects representing the stanzas, according to the schema declared by the library and the application.
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15:36:47 moparisthebest you *can* use a regular DOM parser, with some hax
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15:36:59 jonas’ but there's also a mode where stanzas are written into a DOM
15:37:38 jonas’ if you have a DOM thing which you can feed with SAX events (lxml has that, for instance; but it can also very easily be built from scratch if you have a DOM manipulation library), then you can use the SAX events to create an individual DOM for each stanza
15:37:45 jonas’ if you're into the pain of using DOM
15:37:45 moparisthebest regardless of parser the biggest thing to be aware of is needing to disable 90% of the things XML can do to just get to the subset XMPP uses
15:37:53 jonas’ oh yes, ^
15:38:03 jonas’ otherwise, happy billion laughs
15:38:52 moparisthebest depends what you are doing too, I guess a client can probably get by not worrying about it and trusting their server to sanitize for them but meh
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15:44:03 Kev I typically read with a stream parser, and then construct a pseudo-dom from it.
15:44:26 Zash Pretty much how Prosody works too
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15:53:48 doge Either way seems to take lots of code
15:54:01 doge Especially "directly from sax" approach, looking at aioxmpp source
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15:54:43 jonas’ the direct from sax magic is in aioxmpp/xso and aioxmpp/xml.py, everything else is then just schemas (which are really useful no matter which approach) and business logic
15:54:49 jonas’ https://hg.prosody.im/trunk/file/tip/util/xml.lua this is a simple schema-less sax->dom approach
15:55:05 jonas’ plus the DOM implementation in https://hg.prosody.im/trunk/file/tip/util/stanza.lua
15:55:10 jonas’ wouldn't say that this is "a lot of code" :)
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15:55:28 jonas’ (considering the amount of business logic involved with xmpp in general)
15:55:29 Zash https://hg.prosody.im/trunk/file/tip/util/xmppstream.lua is the one actually used for parsing xmpp
15:55:38 jonas’ oh yeah, I meant to link that
15:55:42 Zash has some session related logic in there tho
15:55:43 jonas’ my history failed me
15:56:05 MattJ The extra stuff in xmppstream is mostly about stanza size accounting, and associating streams with XMPP sessions
15:56:25 MattJ The DOM-building part is the same as util.xml in the first link (at least, it is since a couple of weeks ago... :) )
15:57:00 MattJ and yes, it's quite straightforward and I've written equivalent code a bunch of times in a bunch of languages and environments
15:57:16 MattJ It's definitely my preferred way of doing things
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16:41:39 pep. goffi: right, thanks
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