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dendrite/roomserver
Neil Alexander c85bc3434f
Optimise QuerySharedUsers so that we can only work on local users (#2766)
Otherwise the sync API key change consumer wastes a lot of time trying
to wake up the notifiers for non-local users.
2022-10-05 12:47:53 +01:00
..
acls Pass pointers to events — reloaded (#1583) 2020-11-16 15:44:53 +00:00
api Optimise QuerySharedUsers so that we can only work on local users (#2766) 2022-10-05 12:47:53 +01:00
auth Pass pointers to events — reloaded (#1583) 2020-11-16 15:44:53 +00:00
internal Optimise QuerySharedUsers so that we can only work on local users (#2766) 2022-10-05 12:47:53 +01:00
inthttp Restore the room version cache in the roomserver internal API HTTP client 2022-08-11 17:34:09 +01:00
producers Add RoomEventType nats.Header to avoid unneeded unmarshalling (#2765) 2022-10-05 12:12:42 +02:00
state Tweak LoadMembershipAtEvent behaviour when state not known (#2716) 2022-09-13 12:52:09 +01:00
storage Optimise QuerySharedUsers so that we can only work on local users (#2766) 2022-10-05 12:47:53 +01:00
types Various roominfo tweaks (#2607) 2022-08-02 12:27:15 +01:00
version Set default room version to 9 2022-08-11 16:31:44 +01:00
README.md use go module for dependencies (#594) 2019-05-21 21:56:55 +01:00
roomserver.go Fix QuerySharedUsers for the SyncAPI keychange consumer (#2554) 2022-07-05 14:50:56 +02:00
roomserver_test.go Fix QuerySharedUsers for the SyncAPI keychange consumer (#2554) 2022-07-05 14:50:56 +02:00

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 |
+---------------+-------------------+------------------+----------+