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Refactor state group lookup to reduce DB hits (#4011)

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Currently when fetching state groups from the data store we make two
hits two the database: once for members and once for non-members (unless
request is filtered to one or the other). This adds needless load to the
datbase, so this PR refactors the lookup to make only a single database
hit.
This commit is contained in:
Erik Johnston 2018-10-25 17:49:55 +01:00 • committed by GitHub
parent e5da60d75d
commit cb53ce9d64
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11 changed files with 717 additions and 488 deletions
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20
synapse/handlers/message.py
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@ -35,6 +35,7 @@ from synapse.crypto.event_signing import add_hashes_and_signatures
from synapse.events.utils import serialize_event
from synapse.events.validator import EventValidator
from synapse.replication.http.send_event import ReplicationSendEventRestServlet
from synapse.storage.state import StateFilter
from synapse.types import RoomAlias, UserID
from synapse.util.async_helpers import Linearizer
from synapse.util.frozenutils import frozendict_json_encoder
@ -80,7 +81,7 @@ class MessageHandler(object):
elif membership == Membership.LEAVE:
key = (event_type, state_key)
room_state = yield self.store.get_state_for_events(
[membership_event_id], [key]
[membership_event_id], StateFilter.from_types([key])
)
data = room_state[membership_event_id].get(key)
@ -88,7 +89,7 @@ class MessageHandler(object):
@defer.inlineCallbacks
def get_state_events(
self, user_id, room_id, types=None, filtered_types=None,
self, user_id, room_id, state_filter=StateFilter.all(),
at_token=None, is_guest=False,
):
"""Retrieve all state events for a given room. If the user is
@ -100,13 +101,8 @@ class MessageHandler(object):
Args:
user_id(str): The user requesting state events.
room_id(str): The room ID to get all state events from.
types(list[(str, str|None)]|None): List of (type, state_key) tuples
which are used to filter the state fetched. If `state_key` is None,
all events are returned of the given type.
May be None, which matches any key.
filtered_types(list[str]|None): Only apply filtering via `types` to this
list of event types. Other types of events are returned unfiltered.
If None, `types` filtering is applied to all events.
state_filter (StateFilter): The state filter used to fetch state
from the database.
at_token(StreamToken|None): the stream token of the at which we are requesting
the stats. If the user is not allowed to view the state as of that
stream token, we raise a 403 SynapseError. If None, returns the current
@ -139,7 +135,7 @@ class MessageHandler(object):
event = last_events[0]
if visible_events:
room_state = yield self.store.get_state_for_events(
[event.event_id], types, filtered_types=filtered_types,
[event.event_id], state_filter=state_filter,
)
room_state = room_state[event.event_id]
else:
@ -158,12 +154,12 @@ class MessageHandler(object):
if membership == Membership.JOIN:
state_ids = yield self.store.get_filtered_current_state_ids(
room_id, types, filtered_types=filtered_types,
room_id, state_filter=state_filter,
)
room_state = yield self.store.get_events(state_ids.values())
elif membership == Membership.LEAVE:
room_state = yield self.store.get_state_for_events(
[membership_event_id], types, filtered_types=filtered_types,
[membership_event_id], state_filter=state_filter,
)
room_state = room_state[membership_event_id]