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Faster joins: don't stall when a user joins during a fast join (#14606)

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Fixes #12801.
Complement tests are at
https://github.com/matrix-org/complement/pull/567.

Avoid blocking on full state when handling a subsequent join into a
partial state room.

Also always perform a remote join into partial state rooms, since we do
not know whether the joining user has been banned and want to avoid
leaking history to banned users.

Signed-off-by: Mathieu Velten <mathieuv@matrix.org>
Co-authored-by: Sean Quah <seanq@matrix.org>
Co-authored-by: David Robertson <davidr@element.io>
This commit is contained in:
Mathieu Velten 2023-02-11 00:31:05 +01:00 • committed by GitHub
parent d0c713cc85
commit 6cddf24e36
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12 changed files with 196 additions and 94 deletions
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16
synapse/handlers/event_auth.py
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@ -202,7 +202,7 @@ class EventAuthHandler:
state_ids: StateMap[str],
room_version: RoomVersion,
user_id: str,
prev_member_event: Optional[EventBase],
prev_membership: Optional[str],
) -> None:
"""
Check whether a user can join a room without an invite due to restricted join rules.
@ -214,15 +214,14 @@ class EventAuthHandler:
state_ids: The state of the room as it currently is.
room_version: The room version of the room being joined.
user_id: The user joining the room.
prev_member_event: The current membership event for this user.
prev_membership: The current membership state for this user. `None` if the
user has never joined the room (equivalent to "leave").
Raises:
AuthError if the user cannot join the room.
"""
# If the member is invited or currently joined, then nothing to do.
if prev_member_event and (
prev_member_event.membership in (Membership.JOIN, Membership.INVITE)
):
if prev_membership in (Membership.JOIN, Membership.INVITE):
return
# This is not a room with a restricted join rule, so we don't need to do the
@ -255,13 +254,14 @@ class EventAuthHandler:
)
async def has_restricted_join_rules(
self, state_ids: StateMap[str], room_version: RoomVersion
self, partial_state_ids: StateMap[str], room_version: RoomVersion
) -> bool:
"""
Return if the room has the proper join rules set for access via rooms.
Args:
state_ids: The state of the room as it currently is.
state_ids: The state of the room as it currently is. May be full or partial
state.
room_version: The room version of the room to query.
Returns:
@ -272,7 +272,7 @@ class EventAuthHandler:
return False
# If there's no join rule, then it defaults to invite (so this doesn't apply).
join_rules_event_id = state_ids.get((EventTypes.JoinRules, ""), None)
join_rules_event_id = partial_state_ids.get((EventTypes.JoinRules, ""), None)
if not join_rules_event_id:
return False