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dendrite/roomserver
Neil Alexander aebf347a79
Implement gomatrixserverlib.HeaderedEvent in roomserver Kafka output (#914)
* Use Event.Headered

* Use HeaderedEvent in roomserver kafka output

* Fix syncserver-integration-tests

* Update producers to roomserver inputs

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib

* Update gomatrixserverlib
2020-03-17 11:01:25 +00:00
..
alias Implement gomatrixserverlib.HeaderedEvent in roomserver Kafka output (#914) 2020-03-17 11:01:25 +00:00
api Implement gomatrixserverlib.HeaderedEvent in roomserver Kafka output (#914) 2020-03-17 11:01:25 +00:00
auth Replace membership and visibility values with constants (#774) 2019-08-06 15:07:36 +01:00
input Implement gomatrixserverlib.HeaderedEvent in roomserver Kafka output (#914) 2020-03-17 11:01:25 +00:00
query Implement gomatrixserverlib.HeaderedEvent in roomserver Kafka output (#914) 2020-03-17 11:01:25 +00:00
state bugfix: Fix #908 by setting the correct state after the event (#913) 2020-03-16 17:51:58 +00:00
storage Update room version descriptors, add error handling (#906) 2020-03-16 16:05:29 +00:00
types use go module for dependencies (#594) 2019-05-21 21:56:55 +01:00
version Update room version descriptors, add error handling (#906) 2020-03-16 16:05:29 +00:00
README.md use go module for dependencies (#594) 2019-05-21 21:56:55 +01:00
roomserver.go use go module for dependencies (#594) 2019-05-21 21:56:55 +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 |
+---------------+-------------------+------------------+----------+