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Update docstrings to explain the impact of partial state (#13750)

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Update the docstrings for `get_users_in_room` and
`get_current_hosts_in_room` to explain the impact of partial state.

Signed-off-by: Sean Quah <seanq@matrix.org>
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Sean Quah 2022-09-08 15:55:29 +01:00 committed by GitHub
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2 changed files with 17 additions and 1 deletions
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changelog.d/13750.misc Normal file
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@ -0,0 +1 @@
Update the docstrings for `get_users_in_room` and `get_current_hosts_in_room` to explain the impact of partial state.

17
synapse/storage/databases/main/roommember.py
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@ -192,8 +192,15 @@ class RoomMemberWorkerStore(EventsWorkerStore):
(aka. with the lowest depth). This is done to match the sort in
`get_current_hosts_in_room()` and so we can re-use the cache but it's
not horrible to have here either.
"""
Uses `m.room.member`s in the room state at the current forward extremities to
determine which users are in the room.
Will return inaccurate results for rooms with partial state, since the state for
the forward extremities of those rooms will exclude most members. We may also
calculate room state incorrectly for such rooms and believe that a member is or
is not in the room when the opposite is true.
"""
return await self.db_pool.runInteraction(
"get_users_in_room", self.get_users_in_room_txn, room_id
)
@ -1022,6 +1029,14 @@ class RoomMemberWorkerStore(EventsWorkerStore):
longest is good because they're most likely to have anything we ask
about.
Uses `m.room.member`s in the room state at the current forward extremities to
determine which hosts are in the room.
Will return inaccurate results for rooms with partial state, since the state for
the forward extremities of those rooms will exclude most members. We may also
calculate room state incorrectly for such rooms and believe that a host is or
is not in the room when the opposite is true.
Returns:
Returns a list of servers sorted by longest in the room first. (aka.
sorted by join with the lowest depth first).