357 lines
14 KiB
Python
357 lines
14 KiB
Python
# Copyright 2019 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import itertools
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import logging
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from typing import TYPE_CHECKING, Any, Collection, Iterable, List, Optional, Tuple
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from synapse.api.constants import EventTypes
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from synapse.replication.tcp.streams import BackfillStream, CachesStream
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from synapse.replication.tcp.streams.events import (
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EventsStream,
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EventsStreamCurrentStateRow,
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EventsStreamEventRow,
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EventsStreamRow,
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)
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import (
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DatabasePool,
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LoggingDatabaseConnection,
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LoggingTransaction,
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)
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from synapse.storage.engines import PostgresEngine
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from synapse.util.caches.descriptors import _CachedFunction
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from synapse.util.iterutils import batch_iter
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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# This is a special cache name we use to batch multiple invalidations of caches
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# based on the current state when notifying workers over replication.
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CURRENT_STATE_CACHE_NAME = "cs_cache_fake"
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class CacheInvalidationWorkerStore(SQLBaseStore):
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def __init__(
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self,
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database: DatabasePool,
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db_conn: LoggingDatabaseConnection,
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hs: "HomeServer",
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):
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super().__init__(database, db_conn, hs)
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self._instance_name = hs.get_instance_name()
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self.db_pool.updates.register_background_index_update(
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update_name="cache_invalidation_index_by_instance",
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index_name="cache_invalidation_stream_by_instance_instance_index",
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table="cache_invalidation_stream_by_instance",
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columns=("instance_name", "stream_id"),
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psql_only=True, # The table is only on postgres DBs.
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)
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async def get_all_updated_caches(
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self, instance_name: str, last_id: int, current_id: int, limit: int
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) -> Tuple[List[Tuple[int, tuple]], int, bool]:
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"""Get updates for caches replication stream.
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Args:
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instance_name: The writer we want to fetch updates from. Unused
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here since there is only ever one writer.
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last_id: The token to fetch updates from. Exclusive.
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current_id: The token to fetch updates up to. Inclusive.
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limit: The requested limit for the number of rows to return. The
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function may return more or fewer rows.
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Returns:
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A tuple consisting of: the updates, a token to use to fetch
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subsequent updates, and whether we returned fewer rows than exists
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between the requested tokens due to the limit.
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The token returned can be used in a subsequent call to this
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function to get further updatees.
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The updates are a list of 2-tuples of stream ID and the row data
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"""
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if last_id == current_id:
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return [], current_id, False
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def get_all_updated_caches_txn(
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txn: LoggingTransaction,
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) -> Tuple[List[Tuple[int, tuple]], int, bool]:
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# We purposefully don't bound by the current token, as we want to
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# send across cache invalidations as quickly as possible. Cache
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# invalidations are idempotent, so duplicates are fine.
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sql = """
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SELECT stream_id, cache_func, keys, invalidation_ts
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FROM cache_invalidation_stream_by_instance
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WHERE stream_id > ? AND instance_name = ?
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ORDER BY stream_id ASC
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LIMIT ?
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"""
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txn.execute(sql, (last_id, instance_name, limit))
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updates = [(row[0], row[1:]) for row in txn]
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limited = False
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upto_token = current_id
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if len(updates) >= limit:
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upto_token = updates[-1][0]
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limited = True
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return updates, upto_token, limited
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return await self.db_pool.runInteraction(
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"get_all_updated_caches", get_all_updated_caches_txn
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)
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def process_replication_rows(
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self, stream_name: str, instance_name: str, token: int, rows: Iterable[Any]
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) -> None:
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if stream_name == EventsStream.NAME:
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for row in rows:
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self._process_event_stream_row(token, row)
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elif stream_name == BackfillStream.NAME:
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for row in rows:
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self._invalidate_caches_for_event(
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-token,
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row.event_id,
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row.room_id,
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row.type,
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row.state_key,
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row.redacts,
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row.relates_to,
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backfilled=True,
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)
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elif stream_name == CachesStream.NAME:
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if self._cache_id_gen:
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self._cache_id_gen.advance(instance_name, token)
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for row in rows:
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if row.cache_func == CURRENT_STATE_CACHE_NAME:
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if row.keys is None:
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raise Exception(
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"Can't send an 'invalidate all' for current state cache"
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)
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room_id = row.keys[0]
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members_changed = set(row.keys[1:])
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self._invalidate_state_caches(room_id, members_changed)
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else:
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self._attempt_to_invalidate_cache(row.cache_func, row.keys)
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super().process_replication_rows(stream_name, instance_name, token, rows)
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def _process_event_stream_row(self, token: int, row: EventsStreamRow) -> None:
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data = row.data
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if row.type == EventsStreamEventRow.TypeId:
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assert isinstance(data, EventsStreamEventRow)
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self._invalidate_caches_for_event(
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token,
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data.event_id,
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data.room_id,
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data.type,
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data.state_key,
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data.redacts,
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data.relates_to,
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backfilled=False,
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)
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elif row.type == EventsStreamCurrentStateRow.TypeId:
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assert isinstance(data, EventsStreamCurrentStateRow)
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self._curr_state_delta_stream_cache.entity_has_changed(data.room_id, token)
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if data.type == EventTypes.Member:
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self.get_rooms_for_user_with_stream_ordering.invalidate(
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(data.state_key,)
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)
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else:
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raise Exception("Unknown events stream row type %s" % (row.type,))
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def _invalidate_caches_for_event(
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self,
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stream_ordering: int,
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event_id: str,
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room_id: str,
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etype: str,
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state_key: Optional[str],
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redacts: Optional[str],
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relates_to: Optional[str],
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backfilled: bool,
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) -> None:
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# This invalidates any local in-memory cached event objects, the original
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# process triggering the invalidation is responsible for clearing any external
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# cached objects.
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self._invalidate_local_get_event_cache(event_id)
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self.have_seen_event.invalidate((room_id, event_id))
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self.get_latest_event_ids_in_room.invalidate((room_id,))
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self.get_unread_event_push_actions_by_room_for_user.invalidate((room_id,))
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# The `_get_membership_from_event_id` is immutable, except for the
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# case where we look up an event *before* persisting it.
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self._get_membership_from_event_id.invalidate((event_id,))
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if not backfilled:
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self._events_stream_cache.entity_has_changed(room_id, stream_ordering)
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if redacts:
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self._invalidate_local_get_event_cache(redacts)
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# Caches which might leak edits must be invalidated for the event being
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# redacted.
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self.get_relations_for_event.invalidate((redacts,))
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self.get_applicable_edit.invalidate((redacts,))
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if etype == EventTypes.Member:
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self._membership_stream_cache.entity_has_changed(state_key, stream_ordering)
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self.get_invited_rooms_for_local_user.invalidate((state_key,))
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if relates_to:
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self.get_relations_for_event.invalidate((relates_to,))
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self.get_aggregation_groups_for_event.invalidate((relates_to,))
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self.get_applicable_edit.invalidate((relates_to,))
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self.get_thread_summary.invalidate((relates_to,))
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self.get_thread_participated.invalidate((relates_to,))
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async def invalidate_cache_and_stream(
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self, cache_name: str, keys: Tuple[Any, ...]
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) -> None:
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"""Invalidates the cache and adds it to the cache stream so slaves
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will know to invalidate their caches.
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This should only be used to invalidate caches where slaves won't
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otherwise know from other replication streams that the cache should
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be invalidated.
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"""
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cache_func = getattr(self, cache_name, None)
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if not cache_func:
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return
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cache_func.invalidate(keys)
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await self.db_pool.runInteraction(
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"invalidate_cache_and_stream",
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self._send_invalidation_to_replication,
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cache_func.__name__,
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keys,
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)
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def _invalidate_cache_and_stream(
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self,
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txn: LoggingTransaction,
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cache_func: _CachedFunction,
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keys: Tuple[Any, ...],
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) -> None:
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"""Invalidates the cache and adds it to the cache stream so slaves
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will know to invalidate their caches.
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This should only be used to invalidate caches where slaves won't
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otherwise know from other replication streams that the cache should
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be invalidated.
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"""
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txn.call_after(cache_func.invalidate, keys)
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self._send_invalidation_to_replication(txn, cache_func.__name__, keys)
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def _invalidate_all_cache_and_stream(
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self, txn: LoggingTransaction, cache_func: _CachedFunction
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) -> None:
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"""Invalidates the entire cache and adds it to the cache stream so slaves
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will know to invalidate their caches.
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"""
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txn.call_after(cache_func.invalidate_all)
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self._send_invalidation_to_replication(txn, cache_func.__name__, None)
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def _invalidate_state_caches_and_stream(
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self, txn: LoggingTransaction, room_id: str, members_changed: Collection[str]
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) -> None:
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"""Special case invalidation of caches based on current state.
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We special case this so that we can batch the cache invalidations into a
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single replication poke.
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Args:
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txn
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room_id: Room where state changed
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members_changed: The user_ids of members that have changed
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"""
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txn.call_after(self._invalidate_state_caches, room_id, members_changed)
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if members_changed:
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# We need to be careful that the size of the `members_changed` list
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# isn't so large that it causes problems sending over replication, so we
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# send them in chunks.
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# Max line length is 16K, and max user ID length is 255, so 50 should
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# be safe.
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for chunk in batch_iter(members_changed, 50):
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keys = itertools.chain([room_id], chunk)
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self._send_invalidation_to_replication(
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txn, CURRENT_STATE_CACHE_NAME, keys
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)
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else:
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# if no members changed, we still need to invalidate the other caches.
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self._send_invalidation_to_replication(
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txn, CURRENT_STATE_CACHE_NAME, [room_id]
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)
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def _send_invalidation_to_replication(
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self, txn: LoggingTransaction, cache_name: str, keys: Optional[Iterable[Any]]
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) -> None:
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"""Notifies replication that given cache has been invalidated.
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Note that this does *not* invalidate the cache locally.
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Args:
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txn
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cache_name
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keys: Entry to invalidate. If None will invalidate all.
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"""
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if cache_name == CURRENT_STATE_CACHE_NAME and keys is None:
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raise Exception(
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"Can't stream invalidate all with magic current state cache"
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)
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if isinstance(self.database_engine, PostgresEngine):
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# get_next() returns a context manager which is designed to wrap
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# the transaction. However, we want to only get an ID when we want
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# to use it, here, so we need to call __enter__ manually, and have
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# __exit__ called after the transaction finishes.
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stream_id = self._cache_id_gen.get_next_txn(txn)
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txn.call_after(self.hs.get_notifier().on_new_replication_data)
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if keys is not None:
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keys = list(keys)
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self.db_pool.simple_insert_txn(
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txn,
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table="cache_invalidation_stream_by_instance",
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values={
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"stream_id": stream_id,
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"instance_name": self._instance_name,
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"cache_func": cache_name,
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"keys": keys,
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"invalidation_ts": self._clock.time_msec(),
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},
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)
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def get_cache_stream_token_for_writer(self, instance_name: str) -> int:
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if self._cache_id_gen:
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return self._cache_id_gen.get_current_token_for_writer(instance_name)
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else:
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return 0
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