dendrite/roomserver
Neil Alexander 09d3bab838
Metric fixes
Squashed commit of the following:

commit c6eb4d8bbf80320ec2b6d416c77659b0343e5e47
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jul 19 16:52:57 2021 +0100

    Fix bug

commit d420966d9ac44936728960a8d38602662b58f1c3
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jul 19 16:46:12 2021 +0100

    Update metric

commit 0ad6e37846e2ebbbd0e33a38274094bd15b8f11b
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Mon Jul 19 16:30:14 2021 +0100

    Fix observe for calculateStateDurations
2021-07-19 17:20:55 +01:00
..
acls Pass pointers to events — reloaded (#1583) 2020-11-16 15:44:53 +00:00
api Add more optimised code path for checking if we're in a room (#1909) 2021-07-09 16:36:45 +01:00
auth Pass pointers to events — reloaded (#1583) 2020-11-16 15:44:53 +00:00
internal bugfix: retire invites even when we cannot talk to the remote server to make/send_leave (#1918) 2021-07-14 10:39:17 +01:00
inthttp Peeking over federation via MSC2444 (#1391) 2021-01-22 14:55:08 +00:00
state Metric fixes 2021-07-19 17:20:55 +01:00
storage Add more optimised code path for checking if we're in a room (#1909) 2021-07-09 16:36:45 +01:00
types State storage refactor (#1839) 2021-04-26 13:25:57 +01:00
version Set default room version to v6 (#1438) 2020-09-25 12:59:57 +01:00
README.md use go module for dependencies (#594) 2019-05-21 21:56:55 +01:00
roomserver_test.go Top-level setup package (#1605) 2020-12-02 17:41:00 +00:00
roomserver.go Top-level setup package (#1605) 2020-12-02 17:41:00 +00:00

RoomServer

RoomServer Internals

Numeric IDs

To save space matrix string identifiers are mapped to local numeric IDs. The numeric IDs are more efficient to manipulate and use less space to store. The numeric IDs are never exposed in the API the room server exposes. The numeric IDs are converted to string IDs before they leave the room server. The numeric ID for a string ID is never 0 to avoid being confused with go's default zero value. Zero is used to indicate that there was no corresponding string ID. Well-known event types and event state keys are preassigned numeric IDs.

State Snapshot Storage

The room server stores the state of the matrix room at each event. For efficiency the state is stored as blocks of 3-tuples of numeric IDs for the event type, event state key and event ID. For further efficiency the state snapshots are stored as the combination of up to 64 these blocks. This allows blocks of the room state to be reused in multiple snapshots.

The resulting database tables look something like this:

+-------------------------------------------------------------------+
| Events                                                            |
+---------+-------------------+------------------+------------------+
| EventNID| EventTypeNID      | EventStateKeyNID | StateSnapshotNID |
+---------+-------------------+------------------+------------------+
|       1 | m.room.create   1 | ""             1 | <nil>          0 |
|       2 | m.room.member   2 | "@user:foo"    2 | <nil>          0 |
|       3 | m.room.member   2 | "@user:bar"    3 | {1,2}          1 |
|       4 | m.room.message  3 | <nil>          0 | {1,2,3}        2 |
|       5 | m.room.member   2 | "@user:foo"    2 | {1,2,3}        2 |
|       6 | m.room.message  3 | <nil>          0 | {1,3,6}        3 |
+---------+-------------------+------------------+------------------+

+----------------------------------------+
| State Snapshots                        |
+-----------------------+----------------+
| EventStateSnapshotNID | StateBlockNIDs |
+-----------------------+----------------|
|                     1 |           {1}  |
|                     2 |         {1,2}  |
|                     3 |       {1,2,3}  |
+-----------------------+----------------+

+-----------------------------------------------------------------+
| State Blocks                                                    |
+---------------+-------------------+------------------+----------+
| StateBlockNID | EventTypeNID      | EventStateKeyNID | EventNID |
+---------------+-------------------+------------------+----------+
|             1 | m.room.create   1 | ""             1 |        1 |
|             1 | m.room.member   2 | "@user:foo"    2 |        2 |
|             2 | m.room.member   2 | "@user:bar"    3 |        3 |
|             3 | m.room.member   2 | "@user:foo"    2 |        6 |
+---------------+-------------------+------------------+----------+