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Diffstat (limited to 'synapse/replication/slave/storage/events.py')
| -rw-r--r-- | synapse/replication/slave/storage/events.py | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/synapse/replication/slave/storage/events.py b/synapse/replication/slave/storage/events.py new file mode 100644 index 0000000000..680dc89536 --- /dev/null +++ b/synapse/replication/slave/storage/events.py @@ -0,0 +1,199 @@ +# -*- coding: utf-8 -*- +# Copyright 2016 OpenMarket 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. +from ._base import BaseSlavedStore +from ._slaved_id_tracker import SlavedIdTracker + +from synapse.api.constants import EventTypes +from synapse.events import FrozenEvent +from synapse.storage import DataStore +from synapse.storage.room import RoomStore +from synapse.storage.roommember import RoomMemberStore +from synapse.storage.event_federation import EventFederationStore +from synapse.storage.state import StateStore +from synapse.util.caches.stream_change_cache import StreamChangeCache + +import ujson as json + +# 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(BaseSlavedStore): + + def __init__(self, db_conn, hs): + super(SlavedEventStore, self).__init__(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 + ) + events_max = self._stream_id_gen.get_current_token() + event_cache_prefill, min_event_val = self._get_cache_dict( + db_conn, "events", + entity_column="room_id", + stream_column="stream_ordering", + max_value=events_max, + ) + self._events_stream_cache = StreamChangeCache( + "EventsRoomStreamChangeCache", min_event_val, + prefilled_cache=event_cache_prefill, + ) + + # Cached functions can't be accessed through a class instance so we need + # to reach inside the __dict__ to extract them. + get_room_name_and_aliases = RoomStore.__dict__["get_room_name_and_aliases"] + get_rooms_for_user = RoomMemberStore.__dict__["get_rooms_for_user"] + get_users_in_room = RoomMemberStore.__dict__["get_users_in_room"] + get_latest_event_ids_in_room = EventFederationStore.__dict__[ + "get_latest_event_ids_in_room" + ] + _get_current_state_for_key = StateStore.__dict__[ + "_get_current_state_for_key" + ] + + get_current_state = DataStore.get_current_state.__func__ + get_current_state_for_key = DataStore.get_current_state_for_key.__func__ + get_rooms_for_user_where_membership_is = ( + DataStore.get_rooms_for_user_where_membership_is.__func__ + ) + get_membership_changes_for_user = ( + DataStore.get_membership_changes_for_user.__func__ + ) + get_room_events_max_id = DataStore.get_room_events_max_id.__func__ + get_room_events_stream_for_room = ( + DataStore.get_room_events_stream_for_room.__func__ + ) + _set_before_and_after = DataStore._set_before_and_after + + _get_events = DataStore._get_events.__func__ + _get_events_from_cache = DataStore._get_events_from_cache.__func__ + + _invalidate_get_event_cache = DataStore._invalidate_get_event_cache.__func__ + _parse_events_txn = DataStore._parse_events_txn.__func__ + _get_events_txn = DataStore._get_events_txn.__func__ + _fetch_events_txn = DataStore._fetch_events_txn.__func__ + _fetch_event_rows = DataStore._fetch_event_rows.__func__ + _get_event_from_row_txn = DataStore._get_event_from_row_txn.__func__ + _get_rooms_for_user_where_membership_is_txn = ( + DataStore._get_rooms_for_user_where_membership_is_txn.__func__ + ) + _get_members_rows_txn = DataStore._get_members_rows_txn.__func__ + + def stream_positions(self): + result = super(SlavedEventStore, self).stream_positions() + result["events"] = self._stream_id_gen.get_current_token() + result["backfilled"] = self._backfill_id_gen.get_current_token() + return result + + def process_replication(self, result): + state_resets = set( + r[0] for r in result.get("state_resets", {"rows": []})["rows"] + ) + + stream = result.get("events") + if stream: + self._stream_id_gen.advance(stream["position"]) + for row in stream["rows"]: + self._process_replication_row( + row, backfilled=False, state_resets=state_resets + ) + + stream = result.get("backfill") + if stream: + self._backfill_id_gen.advance(stream["position"]) + for row in stream["rows"]: + self._process_replication_row( + row, backfilled=True, state_resets=state_resets + ) + + stream = result.get("forward_ex_outliers") + if stream: + for row in stream["rows"]: + event_id = row[1] + self._invalidate_get_event_cache(event_id) + + stream = result.get("backward_ex_outliers") + if stream: + for row in stream["rows"]: + event_id = row[1] + self._invalidate_get_event_cache(event_id) + + return super(SlavedEventStore, self).process_replication(result) + + def _process_replication_row(self, row, backfilled, state_resets): + position = row[0] + internal = json.loads(row[1]) + event_json = json.loads(row[2]) + + event = FrozenEvent(event_json, internal_metadata_dict=internal) + self._invalidate_caches_for_event( + event, backfilled, reset_state=position in state_resets + ) + + def _invalidate_caches_for_event(self, event, backfilled, reset_state): + if reset_state: + self._get_current_state_for_key.invalidate_all() + self.get_rooms_for_user.invalidate_all() + self.get_users_in_room.invalidate((event.room_id,)) + # self.get_joined_hosts_for_room.invalidate((event.room_id,)) + self.get_room_name_and_aliases.invalidate((event.room_id,)) + + self._invalidate_get_event_cache(event.event_id) + + if not backfilled: + self._events_stream_cache.entity_has_changed( + event.room_id, event.internal_metadata.stream_ordering + ) + + # self.get_unread_event_push_actions_by_room_for_user.invalidate_many( + # (event.room_id,) + # ) + + if event.type == EventTypes.Redaction: + self._invalidate_get_event_cache(event.redacts) + + if event.type == EventTypes.Member: + self.get_rooms_for_user.invalidate((event.state_key,)) + # self.get_joined_hosts_for_room.invalidate((event.room_id,)) + self.get_users_in_room.invalidate((event.room_id,)) + # self._membership_stream_cache.entity_has_changed( + # event.state_key, event.internal_metadata.stream_ordering + # ) + + if not event.is_state(): + return + + if backfilled: + return + + if (not event.internal_metadata.is_invite_from_remote() + and event.internal_metadata.is_outlier()): + return + + self._get_current_state_for_key.invalidate(( + event.room_id, event.type, event.state_key + )) + + if event.type in [EventTypes.Name, EventTypes.Aliases]: + self.get_room_name_and_aliases.invalidate( + (event.room_id,) + ) + pass |