173 lines
6.5 KiB
Python
173 lines
6.5 KiB
Python
# -*- coding: utf-8 -*-
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# 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 Any, Iterable, Optional, Tuple
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from twisted.internet import defer
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.engines import PostgresEngine
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from synapse.util.iterutils import batch_iter
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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 CacheInvalidationStore(SQLBaseStore):
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async def invalidate_cache_and_stream(self, cache_name: str, keys: Tuple[Any, ...]):
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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.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(self, txn, cache_func, keys):
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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(self, txn, cache_func):
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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(self, txn, room_id, members_changed):
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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 (str): Room where state changed
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members_changed (iterable[str]): 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, cache_name: str, keys: Optional[Iterable[Any]]
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):
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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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ctx = self._cache_id_gen.get_next()
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stream_id = ctx.__enter__()
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txn.call_on_exception(ctx.__exit__, None, None, None)
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txn.call_after(ctx.__exit__, None, None, None)
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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.simple_insert_txn(
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txn,
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table="cache_invalidation_stream",
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values={
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"stream_id": stream_id,
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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_all_updated_caches(self, last_id, current_id, limit):
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if last_id == current_id:
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return defer.succeed([])
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def get_all_updated_caches_txn(txn):
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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"
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" WHERE stream_id > ? ORDER BY stream_id ASC LIMIT ?"
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)
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txn.execute(sql, (last_id, limit))
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return txn.fetchall()
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return self.db.runInteraction(
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"get_all_updated_caches", get_all_updated_caches_txn
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)
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def get_cache_stream_token(self):
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if self._cache_id_gen:
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return self._cache_id_gen.get_current_token()
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else:
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return 0
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