Remove cached wrap on _get_joined_users_from_context method (#13569)

The method doesn't actually do any data fetching and the method that
does, `_get_joined_profile_from_event_id`, has its own cache.

Signed off by Nick @ Beeper (@Fizzadar).
This commit is contained in:
Nick Mills-Barrett 2022-08-31 12:19:39 +01:00 committed by GitHub
parent 7bc110a19e
commit 42b11d5565
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3 changed files with 41 additions and 86 deletions

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@ -0,0 +1 @@
Remove redundant `_get_joined_users_from_context` cache. Contributed by Nick @ Beeper (@fizzadar).

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@ -232,7 +232,7 @@ class StateHandler:
logger.debug("calling resolve_state_groups from get_current_user_ids_in_room")
entry = await self.resolve_state_groups_for_events(room_id, latest_event_ids)
state = await entry.get_state(self._state_storage_controller, StateFilter.all())
return await self.store.get_joined_user_ids_from_state(room_id, state, entry)
return await self.store.get_joined_user_ids_from_state(room_id, state)
async def get_hosts_in_room_at_events(
self, room_id: str, event_ids: Collection[str]

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@ -31,7 +31,6 @@ from typing import (
import attr
from synapse.api.constants import EventTypes, Membership
from synapse.events import EventBase
from synapse.metrics import LaterGauge
from synapse.metrics.background_process_metrics import (
run_as_background_process,
@ -883,96 +882,51 @@ class RoomMemberWorkerStore(EventsWorkerStore):
return shared_room_ids or frozenset()
async def get_joined_user_ids_from_state(
self, room_id: str, state: StateMap[str], state_entry: "_StateCacheEntry"
self, room_id: str, state: StateMap[str]
) -> Set[str]:
state_group: Union[object, int] = state_entry.state_group
if not state_group:
# If state_group is None it means it has yet to be assigned a
# state group, i.e. we need to make sure that calls with a state_group
# of None don't hit previous cached calls with a None state_group.
# To do this we set the state_group to a new object as object() != object()
state_group = object()
"""
For a given set of state IDs, get a set of user IDs in the room.
assert state_group is not None
with Measure(self._clock, "get_joined_users_from_state"):
return await self._get_joined_user_ids_from_context(
room_id, state_group, state, context=state_entry
This method checks the local event cache, before calling
`_get_user_ids_from_membership_event_ids` for any uncached events.
"""
with Measure(self._clock, "get_joined_user_ids_from_state"):
users_in_room = set()
member_event_ids = [
e_id for key, e_id in state.items() if key[0] == EventTypes.Member
]
# We check if we have any of the member event ids in the event cache
# before we ask the DB
# We don't update the event cache hit ratio as it completely throws off
# the hit ratio counts. After all, we don't populate the cache if we
# miss it here
event_map = self._get_events_from_local_cache(
member_event_ids, update_metrics=False
)
@cached(num_args=2, iterable=True, max_entries=100000)
async def _get_joined_user_ids_from_context(
self,
room_id: str,
state_group: Union[object, int],
current_state_ids: StateMap[str],
event: Optional[EventBase] = None,
context: Optional["_StateCacheEntry"] = None,
) -> Set[str]:
# We don't use `state_group`, it's there so that we can cache based
# on it. However, it's important that it's never None, since two current_states
# with a state_group of None are likely to be different.
assert state_group is not None
missing_member_event_ids = []
for event_id in member_event_ids:
ev_entry = event_map.get(event_id)
if ev_entry and not ev_entry.event.rejected_reason:
if ev_entry.event.membership == Membership.JOIN:
users_in_room.add(ev_entry.event.state_key)
else:
missing_member_event_ids.append(event_id)
users_in_room = set()
member_event_ids = [
e_id
for key, e_id in current_state_ids.items()
if key[0] == EventTypes.Member
]
if context is not None:
# If we have a context with a delta from a previous state group,
# check if we also have the result from the previous group in cache.
# If we do then we can reuse that result and simply update it with
# any membership changes in `delta_ids`
if context.prev_group and context.delta_ids:
prev_res = self._get_joined_user_ids_from_context.cache.get_immediate(
(room_id, context.prev_group), None
if missing_member_event_ids:
event_to_memberships = (
await self._get_user_ids_from_membership_event_ids(
missing_member_event_ids
)
)
users_in_room.update(
user_id for user_id in event_to_memberships.values() if user_id
)
if prev_res and isinstance(prev_res, set):
users_in_room = prev_res
member_event_ids = [
e_id
for key, e_id in context.delta_ids.items()
if key[0] == EventTypes.Member
]
for etype, state_key in context.delta_ids:
if etype == EventTypes.Member:
users_in_room.discard(state_key)
# We check if we have any of the member event ids in the event cache
# before we ask the DB
# We don't update the event cache hit ratio as it completely throws off
# the hit ratio counts. After all, we don't populate the cache if we
# miss it here
event_map = self._get_events_from_local_cache(
member_event_ids, update_metrics=False
)
missing_member_event_ids = []
for event_id in member_event_ids:
ev_entry = event_map.get(event_id)
if ev_entry and not ev_entry.event.rejected_reason:
if ev_entry.event.membership == Membership.JOIN:
users_in_room.add(ev_entry.event.state_key)
else:
missing_member_event_ids.append(event_id)
if missing_member_event_ids:
event_to_memberships = await self._get_user_ids_from_membership_event_ids(
missing_member_event_ids
)
users_in_room.update(
user_id for user_id in event_to_memberships.values() if user_id
)
if event is not None and event.type == EventTypes.Member:
if event.membership == Membership.JOIN:
if event.event_id in member_event_ids:
users_in_room.add(event.state_key)
return users_in_room
return users_in_room
@cached(
max_entries=10000,
@ -1205,7 +1159,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
# The cache doesn't match the state group or prev state group,
# so we calculate the result from first principles.
joined_user_ids = await self.get_joined_user_ids_from_state(
room_id, state, state_entry
room_id, state
)
cache.hosts_to_joined_users = {}