ejabberd - Thursday, June 6, 2019

ejabberd

Thursday, June 6, 2019< ^ >

zinid has set the subject to: ejabberd discussions: https://docs.ejabberd.im

Room Configuration

Room Occupants

GMT+0
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[00:22:22] <Licaon_Kter> > production servers for testing 🙂
Eheheh
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[06:26:47] <zinid> Matrix.org style
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[07:49:37] <Holger> > Unknown option 'auth_cache_lifetime', did you mean 'auth_cache_life_time'?
Yes sir!
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[07:52:54] <zinid> upcoming version will be even cooler 😁
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[15:47:05] <marevalo> !version jabberes.org
[15:47:09] <Servant> marevalo: jabberes.org is running ejabberd version 15.04.17 on unix/linux 3.13.0
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[15:49:07] <marevalo> What is the "feature" that sends a message everytime you enter a MUC it sends you a message with the subject? On that old ejabberd version....
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[15:49:51] <Holger> marevalo: The specs changed on how to interpret a message that has both a subject and a body.
[15:50:51] <Holger> marevalo: Originally the MUC spec said this is the way to set and announce the room topic.  Now it says that room topics must be set without including a body.
[15:51:38] <marevalo> Holger: so the problem is "too old server version"
[15:51:40] <Holger> marevalo: Old ejabberd implements old specs, and includes a body while trying to inform the client about the room's topic.  New client follows new spec and thinks "oh this is a message", and shows it.
[15:51:44] <Holger> marevalo: Yes.
[15:51:50] <marevalo> Holger: thanks
[15:52:33] <Holger> marevalo: Back when those old servers were more common I wrote this: https://github.com/weiss/mod_filter_muc_infos
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[15:52:49] <Holger> But I no longer use it, can't remember running into this for a long time.
[15:53:04] <Holger> (And it will no longer work with current ejabberd.)
[15:53:55] <marevalo> Wow, that was a hell of a detailed answer, thanks again
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[17:01:43] <ChaosKid42> I'm having some trouble with ejabberd 19.05 in cluster-mode with mod_muc. After returning to ejabberd 19.02 the problems are gone. Switching back and forth it seems to be a reproducable:
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[17:03:25] <ChaosKid42> When connecting to one node for the first time mod_muc seems to work all right (querying for rooms return all the rooms I'm subscribed to). When I connect to some other node the list of rooms is empty. Only when I query the first server I connected to the list of rooms is there again.
[17:03:48] <ChaosKid42> Did anybody else observe this?
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[17:06:00] <zinid> don't you mix 19.02 and 19.05 in cluster?
[17:06:34] <ChaosKid42> No. I don't think so.
[17:07:05] <zinid> there is incompatibility between the calls
[17:07:41] <ChaosKid42> Ok. I'll return to 19.05 and make sure that I don't mix them up. One minute ...
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[17:10:27] <zinid> if you start 19.05 (on all nodes) and the problem is not gone, don't stop, I'll ask you to gather some debug data (via `ejabberdctl remsh`)
[17:10:45] <zinid> `ejabberdctl debug`
[17:12:18] <ChaosKid42> Problem is not gone
[17:14:07] <zinid> run `ejabberdctl debug` on "broken" node and first run:
> ets:info(muc_online_room, size).
[17:14:35] <zinid> it shouldn't be very small and zero
[17:14:43] <zinid> *or zero
[17:14:56] <zinid> in fact if you run this on both nodes the output must be equal
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[17:17:41] <ChaosKid42> Its 5 on all nodes.
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[17:18:24] <zinid> is it expected?
[17:18:32] <ChaosKid42> 5 is the number of rooms in the table muc_room on sql server.
[17:18:43] <zinid> ah, okay, so all are loaded
[17:18:57] <zinid> are they all loaded on a single node?
[17:19:12] <zinid> you can just use `ets:tab2list(muc_online_room).`
[17:19:36] <zinid> if the pid is <0.x.y> it's local, if <some.x.y> it's on remote node
[17:19:39] <ChaosKid42> Yes. On all nodes.
[17:19:50] <ChaosKid42> Ok  let's check
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[17:20:24] <ChaosKid42> local on the first remote on the other two.
[17:21:04] <zinid> ok, so disco only works if client runs disco query from the "local" node (i.e. where the rooms are loaded), right?
[17:21:18] <ChaosKid42> Yes.
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[17:22:31] <zinid> so, from any remote node, grab the muc pid (a remote pid) and run:
> p1_fsm:sync_send_all_state_event(Pid, {get_disco_item, all, jid:make(<<"domain.tld">>), <<"en">>}}).
[17:22:58] <zinid> > p1_fsm:sync_send_all_state_event(Pid, {get_disco_item, all, jid:make(<<"domain.tld">>), <<"en">>}).
[17:23:24] <zinid> domain.tld is your server virtual host or conference domain, whatever
[17:24:11] <zinid> you can use Pid = pid(X, Y, X)
[17:24:17] <zinid> pid(X, Y, Z), sorry
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[17:25:09] <ChaosKid42> returns false
[17:25:18] <zinid> hum
[17:25:28] <zinid> why?
[17:25:31] <zinid> some ACL?
[17:26:03] <ChaosKid42> No. Shall I try that on the working node?
[17:26:22] <zinid> yes
[17:26:35] <zinid> you can use jid:make(<<"user">>, <<"domain.tld">>)
[17:26:47] <ChaosKid42> With a local pid?
[17:26:50] <zinid> to make sure a user is a member of the conference (or admin, whatever)
[17:26:51] <zinid> yes,
[17:27:01] <zinid> yes, local, they will be all local to that node 😉
[17:29:52] <ChaosKid42> I did the following on the local node:
p1_fsm:sync_send_all_state_event(pid(0,734,0), {get_disco_item, all, jid:make(<<"user">>,<<"domain.tld">>), <<"en">>}).
[17:30:02] <zinid> and?
[17:30:07] <ChaosKid42> {item,<<"test4 (private, 0)">>}
[17:30:21] <ChaosKid42> on remote I did p1_fsm:sync_send_all_state_event(pid(32007,734,0), {get_disco_item, all, jid:make(<<"user">>,<<"domain.tld">>), <<"en">>}).
[17:30:27] <ChaosKid42> Same result
[17:30:37] <zinid> so everything works fine 😀
[17:32:23] <zinid> maybe you configured `max_rooms_discoitems` on "remote" nodes?
[17:32:30] <zinid> which is very small
[17:32:42] <zinid> the default is 100
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[17:33:38] <ChaosKid42> Didn't fiddle with this option.
[17:34:01] <ChaosKid42> I can actually join the room on the remote node, but querying rooms fails.
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[17:34:45] <zinid> I don't see the bug from the code
[17:34:54] <zinid> maybe a client is setting some weird RSM?
[17:35:04] <zinid> is it the same client?
[17:35:39] <ChaosKid42> Yes. It's converse.js
[17:36:01] <ChaosKid42> And the problem is gone if I switch back to 19.02.
[17:36:07] <zinid> from remsh, try:
> mod_muc_mnesia:get_online_rooms(<<"domain.tld">>, <<"conference.domain.tld">>, undefined).
[17:36:32] <zinid> on "remote" node
[17:37:12] <ChaosKid42> Works on all nodes and returns the rooms.
[17:37:18] <zinid> weird
[17:37:47] <zinid> maybe converse receives some error from the server?
[17:38:04] <ChaosKid42> I am using default_db: sql. Is this relevant?
[17:38:08] <zinid> no
[17:38:26] <ChaosKid42> I'll check for errors...
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[17:39:06] <ChaosKid42> No errors.
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[17:39:33] <zinid> did you try another client?
[17:39:47] <ChaosKid42> No. But i will ...
[17:40:15] <zinid> I don't see the bug in mod_muc.erl code at least, we just checked all the possible cases
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[17:45:36] <zinid> wait
[17:45:43] <zinid> check system time
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[17:46:39] <zinid> also, modify request a bit: run from remote node:
> p1_fsm:sync_send_all_state_event(pid(32007,734,0), {get_disco_item, all, jid:make(<<"user">>,<<"domain.tld">>), <<"en">>}, erlang:monotonic_time(millisecond) + 100).
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[17:47:49] <zinid> argh
[17:47:51] <zinid> typo 🙂
[17:48:10] <zinid> > p1_fsm:sync_send_all_state_event(pid(32007,734,0), {get_disco_item, all, jid:make(<<"user">>,<<"domain.tld">>), <<"en">>, erlang:monotonic_time(millisecond) + 100}).
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[17:51:47] <ChaosKid42> timeout
[17:51:57] <zinid> great
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[17:52:59] <zinid> CurrentTime = erlang:monotonic_time(millisecond),
    if CurrentTime < Time ->
        {reply, Reply, StateName, StateData};
       true ->
        {next_state, StateName, StateData}
end;
[17:53:06] <zinid> this check fails on "local" node
[17:53:17] <zinid> seems like time desynchronization
[17:53:36] <jonny> Time.. What a wonderful topic in programming 🙂
[17:54:05] <zinid> ChaosKid42, the time must not lag more than 100 ms (in this case)
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[17:54:19] <ChaosKid42> Hmm. Doesn't look like it. Date returns basically the same
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[17:54:29] <zinid> 100ms
[17:54:38] <zinid> date will show you nothing
[17:54:56] <ChaosKid42> 100ms Ok. I see.
[17:55:12] <zinid> ejabberd_cluster:multicall(erlang, monotonic_time, [millisecond]).
[17:55:22] <zinid> this will return time from all nodes
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[17:56:45] <ChaosKid42> {[-576457873052,-576457880268,-576457877820],[]}
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[17:57:20] <zinid> > -576457873052 - (-576457880268).
7216
[17:57:25] <zinid> 7 seconds difference
[17:57:58] <jonny> So clustering over wan is bad right?
[17:58:14] <zinid> jonny, you will get weird side effects, yes
[17:59:12] <zinid> ChaosKid42, what about:
> ejabberd_cluster:multicall(erlang, system_time, [millisecond]).
?
[17:59:56] <ChaosKid42> {[1559843988589,1559843988406,1559843988406],[]}
[17:59:58] <zinid> jonny, actually NTP gives you only a few milliseconds difference, I don't know why there is 7! seconds difference
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[18:01:02] <ChaosKid42> Strange. The system time difference is definitely not 7 seconds.
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[18:01:49] <zinid> from the second call (system_time) we see that 2nd and 3rd node have exactly same time
[18:02:03] <zinid> and the 1st lags behind 183ms
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[18:03:03] <zinid> I wonder why there is so huge difference between system_time and monotonic_time
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[18:05:05] <zinid> that 183ms is maybe a round-trip delay
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[18:05:38] <zinid> well, I agree that the code is bad: it relies on too low timeout: only 100ms
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[18:06:31] <ChaosKid42> Strange nevertheless. And why is there no problem in 19.02?
[18:06:41] <zinid> ChaosKid42, because that's the new code 😉
[18:06:55] <zinid> introduced in 19.05
[18:07:20] <ChaosKid42> Ah. OK. I didn't mention that I use it in a docker container, did I?
[18:07:27] <jonny> Thinking of efi/bios != system time
[18:08:32] <zinid> ChaosKid42, system_time is actually correct, at least on two nodes
[18:09:23] <ChaosKid42> Reboot could help?
[18:09:47] <zinid> ChaosKid42, force ntpd to update time on all nodes maybe?
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[18:10:50] <zinid> I also don't understand the huge difference between Erlang's system_time and monotonic_time: you just started the nodes, there shouldn't be huge correction
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[18:13:03] <ChaosKid42> ejabberd_cluster:multicall(erlang, system_time, [millisecond]).
{[1559844763697,1559844763697,1559844763696],[]}
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[18:14:35] <zinid> this one is good
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[18:14:49] <ChaosKid42> Still not working though.
[18:15:00] <zinid> same with monotonic_time please
[18:15:30] <ChaosKid42> {[-576456742482,-576456749516,-576456747068],[]}
[18:16:02] <zinid> did you restart the nodes?
[18:16:08] <ChaosKid42> No
[18:16:17] <zinid> seems like the time is being corrected
[18:16:33] <zinid> no the difference is 7034ms (was 7216).
[18:16:35] <zinid> run again
[18:16:44] <zinid> *now
[18:16:47] <ChaosKid42> {[-576456664067,-576456671101,-576456668653],[]}
[18:17:12] <zinid> nah, got stuck at 7034 🙂
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[18:18:13] <zinid> probably nodes restart will help
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[18:18:41] <zinid> I will change the code to use system_time, but still not very reliable
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[18:20:01] <ChaosKid42> {[-576460706430,-576460700360,-576460703706],[]}
[18:20:04] <ChaosKid42> after restart
[18:20:34] <zinid> 6 seconds, meh
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[18:21:34] <ChaosKid42> Only restarted ejabberd. Maybe whole system?
[18:21:51] <zinid> I am not sure
[18:22:09] <zinid> I start different erlang nodes and see different erlang:time_offset() values
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[18:23:24] <zinid> seems like erlang:monotonic_time() is unreliable between nodes
[18:23:38] <zinid> and we use it a lot in ejabberd, lol
[18:25:29] <zinid> I will fix it, but you have to apply this patch
[18:25:47] <zinid> also make sure the time doesn't go far beyond 100ms between the nodes
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[18:29:39] <zinid> ChaosKid42, commited
[18:30:32] <zinid> https://github.com/processone/ejabberd/commit/80b7d50628a8f6aa152e9fe9f121e667b8450bd7
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[18:32:01] <ChaosKid42> OK. Thanks so much for helping with the problem and using so much time for it! Would it be okay if I tried it tomorrow? Because reconfiguring those docker images will take some time 🙂
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[18:32:23] <zinid> ChaosKid42, sure
[18:32:38] <zinid> let me know about results
[18:33:02] <ChaosKid42> Ok. Thanks again for your help! I will return tomorrow and see if it works for me!
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