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# -*- 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.roommember import RoomMemberStore
from synapse.storage.event_federation import EventFederationStore
from synapse.storage.event_push_actions import EventPushActionsStore
from synapse.storage.state import StateStore
from synapse.storage.stream import StreamStore
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,
)
self._membership_stream_cache = StreamChangeCache(
"MembershipStreamChangeCache", events_max,
)
# Cached functions can't be accessed through a class instance so we need
# to reach inside the __dict__ to extract them.
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_invited_rooms_for_user = RoomMemberStore.__dict__[
"get_invited_rooms_for_user"
]
get_unread_event_push_actions_by_room_for_user = (
EventPushActionsStore.__dict__["get_unread_event_push_actions_by_room_for_user"]
)
_get_state_group_for_events = (
StateStore.__dict__["_get_state_group_for_events"]
)
_get_state_group_for_event = (
StateStore.__dict__["_get_state_group_for_event"]
)
_get_state_groups_from_groups = (
StateStore.__dict__["_get_state_groups_from_groups"]
)
_get_state_groups_from_groups_txn = (
DataStore._get_state_groups_from_groups_txn.__func__
)
_get_state_group_from_group = (
StateStore.__dict__["_get_state_group_from_group"]
)
get_recent_event_ids_for_room = (
StreamStore.__dict__["get_recent_event_ids_for_room"]
)
get_unread_push_actions_for_user_in_range_for_http = (
DataStore.get_unread_push_actions_for_user_in_range_for_http.__func__
)
get_unread_push_actions_for_user_in_range_for_email = (
DataStore.get_unread_push_actions_for_user_in_range_for_email.__func__
)
get_push_action_users_in_range = (
DataStore.get_push_action_users_in_range.__func__
)
get_event = DataStore.get_event.__func__
get_events = DataStore.get_events.__func__
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__
)
get_events_around = DataStore.get_events_around.__func__
get_state_for_event = DataStore.get_state_for_event.__func__
get_state_for_events = DataStore.get_state_for_events.__func__
get_state_groups = DataStore.get_state_groups.__func__
get_state_groups_ids = DataStore.get_state_groups_ids.__func__
get_state_ids_for_event = DataStore.get_state_ids_for_event.__func__
get_state_ids_for_events = DataStore.get_state_ids_for_events.__func__
get_joined_users_from_state = DataStore.get_joined_users_from_state.__func__
get_joined_users_from_context = DataStore.get_joined_users_from_context.__func__
_get_joined_users_from_context = (
RoomMemberStore.__dict__["_get_joined_users_from_context"]
)
get_recent_events_for_room = DataStore.get_recent_events_for_room.__func__
get_room_events_stream_for_rooms = (
DataStore.get_room_events_stream_for_rooms.__func__
)
is_host_joined = DataStore.is_host_joined.__func__
_is_host_joined = RoomMemberStore.__dict__["_is_host_joined"]
get_stream_token_for_event = DataStore.get_stream_token_for_event.__func__
_set_before_and_after = staticmethod(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__
_enqueue_events = DataStore._enqueue_events.__func__
_do_fetch = DataStore._do_fetch.__func__
_fetch_event_rows = DataStore._fetch_event_rows.__func__
_get_event_from_row = DataStore._get_event_from_row.__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__
_get_state_for_groups = DataStore._get_state_for_groups.__func__
_get_all_state_from_cache = DataStore._get_all_state_from_cache.__func__
_get_events_around_txn = DataStore._get_events_around_txn.__func__
_get_some_state_from_cache = DataStore._get_some_state_from_cache.__func__
get_backfill_events = DataStore.get_backfill_events.__func__
_get_backfill_events = DataStore._get_backfill_events.__func__
get_missing_events = DataStore.get_missing_events.__func__
_get_missing_events = DataStore._get_missing_events.__func__
get_auth_chain = DataStore.get_auth_chain.__func__
get_auth_chain_ids = DataStore.get_auth_chain_ids.__func__
_get_auth_chain_ids_txn = DataStore._get_auth_chain_ids_txn.__func__
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(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(int(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(-int(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:
self._stream_id_gen.advance(int(stream["position"]))
for row in stream["rows"]:
event_id = row[1]
self._invalidate_get_event_cache(event_id)
stream = result.get("backward_ex_outliers")
if stream:
self._backfill_id_gen.advance(-int(stream["position"]))
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._invalidate_get_event_cache(event.event_id)
self.get_latest_event_ids_in_room.invalidate((event.room_id,))
self.get_unread_event_push_actions_by_room_for_user.invalidate_many(
(event.room_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_users_in_room.invalidate((event.room_id,))
self._membership_stream_cache.entity_has_changed(
event.state_key, event.internal_metadata.stream_ordering
)
self.get_invited_rooms_for_user.invalidate((event.state_key,))
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
))
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