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dendrite/roomserver
Till 4ccf6d6f67
Cache ACLs regexes (#3336)
Since #3334 didn't change much on d.m.org, this is another attempt to
speed up startup.

Given moderation bots like Mjolnir/Draupnir are in many rooms with quite
often the same or similar ACLs, caching the compiled regexes _should_
reduce the startup time.

Using a pointer to the `*regexp.Regex` ensures we only store _one_
instance of a regex in memory, instead of potentially storing it hundred
of times. This should reduce memory consumption on servers with many
rooms with ACLs drastically. (5.1MB vs 1.7MB with this change on my
server with 8 ACL'd rooms [3 using the same ACLs])

[skip ci]
2024-02-28 20:58:56 +01:00
..
acls Cache ACLs regexes (#3336) 2024-02-28 20:58:56 +01:00
api Fix /createRoom and /invite containing displayname/avatarURL of inviter (#3326) 2024-02-13 19:28:52 +01:00
auth Update gmsl to use new validated RoomID on PDUs (#3200) 2023-09-15 14:39:06 +00:00
internal Speed up start up time by batch querying ACL events (#3334) 2024-02-21 14:10:22 +01:00
producers Speed up start up time by batch querying ACL events (#3334) 2024-02-21 14:10:22 +01:00
state Check event is not rejected (#3243) 2023-10-25 09:47:21 +02:00
storage Speed up start up time by batch querying ACL events (#3334) 2024-02-21 14:10:22 +01:00
types de-MSC-ifying space summaries (MSC2946) (#3134) 2023-07-20 15:06:05 +01:00
version Add config key for default room version (#3171) 2023-08-08 14:20:05 +01:00
README.md use go module for dependencies (#594) 2019-05-21 21:56:55 +01:00
roomserver.go de-MSC-ifying space summaries (MSC2946) (#3134) 2023-07-20 15:06:05 +01:00
roomserver_test.go Use AckExplicitPolicy instead of AckAllPolicy (#3288) 2023-12-19 08:25:47 +01:00

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