134 lines
5.1 KiB
Python
134 lines
5.1 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2019 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# 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 itertools
|
|
import logging
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse.storage._base import SQLBaseStore
|
|
from synapse.storage.engines import PostgresEngine
|
|
from synapse.util import batch_iter
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
# This is a special cache name we use to batch multiple invalidations of caches
|
|
# based on the current state when notifying workers over replication.
|
|
CURRENT_STATE_CACHE_NAME = "cs_cache_fake"
|
|
|
|
|
|
class CacheInvalidationStore(SQLBaseStore):
|
|
def _invalidate_cache_and_stream(self, txn, cache_func, keys):
|
|
"""Invalidates the cache and adds it to the cache stream so slaves
|
|
will know to invalidate their caches.
|
|
|
|
This should only be used to invalidate caches where slaves won't
|
|
otherwise know from other replication streams that the cache should
|
|
be invalidated.
|
|
"""
|
|
txn.call_after(cache_func.invalidate, keys)
|
|
self._send_invalidation_to_replication(txn, cache_func.__name__, keys)
|
|
|
|
def _invalidate_state_caches_and_stream(self, txn, room_id, members_changed):
|
|
"""Special case invalidation of caches based on current state.
|
|
|
|
We special case this so that we can batch the cache invalidations into a
|
|
single replication poke.
|
|
|
|
Args:
|
|
txn
|
|
room_id (str): Room where state changed
|
|
members_changed (iterable[str]): The user_ids of members that have changed
|
|
"""
|
|
txn.call_after(self._invalidate_state_caches, room_id, members_changed)
|
|
|
|
if members_changed:
|
|
# We need to be careful that the size of the `members_changed` list
|
|
# isn't so large that it causes problems sending over replication, so we
|
|
# send them in chunks.
|
|
# Max line length is 16K, and max user ID length is 255, so 50 should
|
|
# be safe.
|
|
for chunk in batch_iter(members_changed, 50):
|
|
keys = itertools.chain([room_id], chunk)
|
|
self._send_invalidation_to_replication(
|
|
txn, CURRENT_STATE_CACHE_NAME, keys
|
|
)
|
|
else:
|
|
# if no members changed, we still need to invalidate the other caches.
|
|
self._send_invalidation_to_replication(
|
|
txn, CURRENT_STATE_CACHE_NAME, [room_id]
|
|
)
|
|
|
|
def _send_invalidation_to_replication(self, txn, cache_name, keys):
|
|
"""Notifies replication that given cache has been invalidated.
|
|
|
|
Note that this does *not* invalidate the cache locally.
|
|
|
|
Args:
|
|
txn
|
|
cache_name (str)
|
|
keys (iterable[str])
|
|
"""
|
|
|
|
if isinstance(self.database_engine, PostgresEngine):
|
|
# get_next() returns a context manager which is designed to wrap
|
|
# the transaction. However, we want to only get an ID when we want
|
|
# to use it, here, so we need to call __enter__ manually, and have
|
|
# __exit__ called after the transaction finishes.
|
|
ctx = self._cache_id_gen.get_next()
|
|
stream_id = ctx.__enter__()
|
|
txn.call_on_exception(ctx.__exit__, None, None, None)
|
|
txn.call_after(ctx.__exit__, None, None, None)
|
|
txn.call_after(self.hs.get_notifier().on_new_replication_data)
|
|
|
|
self.db.simple_insert_txn(
|
|
txn,
|
|
table="cache_invalidation_stream",
|
|
values={
|
|
"stream_id": stream_id,
|
|
"cache_func": cache_name,
|
|
"keys": list(keys),
|
|
"invalidation_ts": self.clock.time_msec(),
|
|
},
|
|
)
|
|
|
|
def get_all_updated_caches(self, last_id, current_id, limit):
|
|
if last_id == current_id:
|
|
return defer.succeed([])
|
|
|
|
def get_all_updated_caches_txn(txn):
|
|
# We purposefully don't bound by the current token, as we want to
|
|
# send across cache invalidations as quickly as possible. Cache
|
|
# invalidations are idempotent, so duplicates are fine.
|
|
sql = (
|
|
"SELECT stream_id, cache_func, keys, invalidation_ts"
|
|
" FROM cache_invalidation_stream"
|
|
" WHERE stream_id > ? ORDER BY stream_id ASC LIMIT ?"
|
|
)
|
|
txn.execute(sql, (last_id, limit))
|
|
return txn.fetchall()
|
|
|
|
return self.db.runInteraction(
|
|
"get_all_updated_caches", get_all_updated_caches_txn
|
|
)
|
|
|
|
def get_cache_stream_token(self):
|
|
if self._cache_id_gen:
|
|
return self._cache_id_gen.get_current_token()
|
|
else:
|
|
return 0
|