| 25 Sep 2020 |
 Sumner Evans | How do you handle when two mods/admins from different servers change a state event on a room in a conflicting way? Specifically thinking about MSC1951 and wondering about how conflicts in the the m.pack.metadata event gets handled. Is timestamp used to determine who wins? | 15:40:28 |
 tulir | https://matrix.org/docs/spec/rooms/v2 | 15:41:51 |
 Jonathan | In reply to @sumner:sumnerevans.com
How do you handle when two mods/admins from different servers change a state event on a room in a conflicting way? Specifically thinking about MSC1951 and wondering about how conflicts in the the m.pack.metadata event gets handled. Is timestamp used to determine who wins? reverse topological event ordering, its a bit of a mouthful, but it basically makes sure that when reconciling forks from 2 servers (this one and another one) together into one "state", it'll make sure that it happens "in order" | 15:43:08 |
| Jonathan | the specifics of this are a bit confusing, but basically; matrix sorts it out, eventually | 15:43:21 |
| 26 Sep 2020 |
|  0xC0ncord left the room. | 20:08:21 |
| 25 Sep 2020 |
| Jonathan | matrix always has a state for a room, a "state key" pointing to a specific auth event describing the content of that state, the stateres (state resolution) algorithm (since room version 2) makes sure that every server arrives to the same state, given the same DAG tree of events | 15:44:57 |
| Jonathan | https://matrix.org/docs/guides/implementing-stateres
here's an overview of how its implemented, an introduction post | 15:46:20 |
| Sumner Evans | Thanks for the info! So, effectively if there's a divergence in the DAG, it gets "zippered" together according to power level, timestamp, and event_id? | 15:53:11 |
| Jonathan | yup | 15:55:57 |
| Jonathan | usually this happens all the time, and matrix just sends a "merge" commit/node/event which just refers to the two last un-linked events in both forks | 15:56:27 |
| Jonathan | but for stateres its a bit more complex | 15:56:38 |
| Jonathan | you can see a nice illustration of this on matrix.org's homepage | 15:56:58 |
| Jonathan | (scroll down to "how does it work?") | 15:57:10 |
| Sumner Evans | Thanks for the explanation! | 16:21:48 |
| Jonathan | np ^^ | 16:27:48 |
| 26 Sep 2020 |
|  dagmar joined the room. | 07:54:07 |
|  kathleen | 09:46:27 |
|  MichaelRaskin joined the room. | 08:15:53 |
| 27 Sep 2020 |
| MichaelRaskin left the room. | 04:22:18 |
| 28 Sep 2020 |
|  Dylanger joined the room. | 10:07:15 |
 MTRNord | Hm not 100% sure if this is a spec question but cant think of a better place to ask. There isnt yet a way to use matrix as a auth provider for a third party service right? Meaning using it as something like oauth2 stuff where a Matrix HS would be used as auth provider. | 21:45:09 |
 TravisR | not yet, but it's a work in progress: https://github.com/turt2live/matrix-oauth | 21:46:36 |
| TravisR | the idea behind that project is after it's been prototyped on its own then it can be made into an MSC | 21:46:54 |
| MTRNord | TravisR: ah cool :) Does that one need to run on HS side or on the project side? 🤔 Basicly I want to use it to easily add Admins to a small thingy around matrix to have a auth around a admin page. | 21:49:30 |
| TravisR | it runs in the middle somewhere, where someone (which may be the project) runs the thing and it magically works | 21:51:13 |
| MTRNord | * TravisR: ah cool :) Does that one need to run on HS side or on the project side? 🤔 Basicly I want to use it to easily add Admins to a small thingy around matrix to have a auth around a admin page. | 21:51:25 |
| MTRNord | ah thats awesome :D that simplifies loads of stuff on my side. Lets see if I can integrate that easily in my project :) | 21:52:09 |
| 29 Sep 2020 |
|  Typo Kign left the room. | 09:01:01 |
 mscbot | [MSC2788] "MSC2788: Room version 6 as the default room version" has now entered final comment period!: https://github.com/matrix-org/matrix-doc/pull/2788 | 18:10:35 |
 KB1RD | MSC1772 says that group membership is determined by peeking into the rooms. How does this work if the group and rooms are invite only? | 22:17:59 |
