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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from synapse.api.constants import EventTypes
from synapse.replication.tcp.streams.events import (
EventsStreamCurrentStateRow,
EventsStreamEventRow,
)
from synapse.storage.data_stores.main.event_federation import EventFederationWorkerStore
from synapse.storage.data_stores.main.event_push_actions import (
EventPushActionsWorkerStore,
)
from synapse.storage.data_stores.main.events_worker import EventsWorkerStore
from synapse.storage.data_stores.main.relations import RelationsWorkerStore
from synapse.storage.data_stores.main.roommember import RoomMemberWorkerStore
from synapse.storage.data_stores.main.signatures import SignatureWorkerStore
from synapse.storage.data_stores.main.state import StateGroupWorkerStore
from synapse.storage.data_stores.main.stream import StreamWorkerStore
from synapse.storage.data_stores.main.user_erasure_store import UserErasureWorkerStore
from ._base import BaseSlavedStore
from ._slaved_id_tracker import SlavedIdTracker
logger = logging.getLogger(__name__)
# So, um, we want to borrow a load of functions intended for reading from
# a DataStore, but we don't want to take functions that either write to the
# DataStore or are cached and don't have cache invalidation logic.
#
# Rather than write duplicate versions of those functions, or lift them to
# a common base class, we going to grab the underlying __func__ object from
# the method descriptor on the DataStore and chuck them into our class.
class SlavedEventStore(
EventFederationWorkerStore,
RoomMemberWorkerStore,
EventPushActionsWorkerStore,
StreamWorkerStore,
StateGroupWorkerStore,
EventsWorkerStore,
SignatureWorkerStore,
UserErasureWorkerStore,
RelationsWorkerStore,
BaseSlavedStore,
):
def __init__(self, db_conn, hs):
self._stream_id_gen = SlavedIdTracker(db_conn, "events", "stream_ordering")
self._backfill_id_gen = SlavedIdTracker(
db_conn, "events", "stream_ordering", step=-1
)
super(SlavedEventStore, self).__init__(db_conn, hs)
# Cached functions can't be accessed through a class instance so we need
# to reach inside the __dict__ to extract them.
def get_room_max_stream_ordering(self):
return self._stream_id_gen.get_current_token()
def get_room_min_stream_ordering(self):
return self._backfill_id_gen.get_current_token()
def stream_positions(self):
result = super(SlavedEventStore, self).stream_positions()
result["events"] = self._stream_id_gen.get_current_token()
result["backfill"] = -self._backfill_id_gen.get_current_token()
return result
def process_replication_rows(self, stream_name, token, rows):
if stream_name == "events":
self._stream_id_gen.advance(token)
for row in rows:
self._process_event_stream_row(token, row)
elif stream_name == "backfill":
self._backfill_id_gen.advance(-token)
for row in rows:
self.invalidate_caches_for_event(
-token,
row.event_id,
row.room_id,
row.type,
row.state_key,
row.redacts,
row.relates_to,
backfilled=True,
)
return super(SlavedEventStore, self).process_replication_rows(
stream_name, token, rows
)
def _process_event_stream_row(self, token, row):
data = row.data
if row.type == EventsStreamEventRow.TypeId:
self.invalidate_caches_for_event(
token,
data.event_id,
data.room_id,
data.type,
data.state_key,
data.redacts,
data.relates_to,
backfilled=False,
)
elif row.type == EventsStreamCurrentStateRow.TypeId:
if data.type == EventTypes.Member:
self.get_rooms_for_user_with_stream_ordering.invalidate(
(data.state_key,)
)
else:
raise Exception("Unknown events stream row type %s" % (row.type,))
def invalidate_caches_for_event(
self,
stream_ordering,
event_id,
room_id,
etype,
state_key,
redacts,
relates_to,
backfilled,
):
self._invalidate_get_event_cache(event_id)
self.get_latest_event_ids_in_room.invalidate((room_id,))
self.get_unread_event_push_actions_by_room_for_user.invalidate_many((room_id,))
if not backfilled:
self._events_stream_cache.entity_has_changed(room_id, stream_ordering)
if redacts:
self._invalidate_get_event_cache(redacts)
if etype == EventTypes.Member:
self._membership_stream_cache.entity_has_changed(state_key, stream_ordering)
self.get_invited_rooms_for_user.invalidate((state_key,))
if relates_to:
self.get_relations_for_event.invalidate_many((relates_to,))
self.get_aggregation_groups_for_event.invalidate_many((relates_to,))
self.get_applicable_edit.invalidate((relates_to,))
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