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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.
import logging
from typing import Dict, Optional
import six
from synapse.storage.data_stores.main.cache import (
CURRENT_STATE_CACHE_NAME,
CacheInvalidationWorkerStore,
)
from synapse.storage.database import Database
from synapse.storage.engines import PostgresEngine
from ._slaved_id_tracker import SlavedIdTracker
logger = logging.getLogger(__name__)
def __func__(inp):
if six.PY3:
return inp
else:
return inp.__func__
class BaseSlavedStore(CacheInvalidationWorkerStore):
def __init__(self, database: Database, db_conn, hs):
super(BaseSlavedStore, self).__init__(database, db_conn, hs)
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = SlavedIdTracker(
db_conn, "cache_invalidation_stream", "stream_id"
) # type: Optional[SlavedIdTracker]
else:
self._cache_id_gen = None
self.hs = hs
def stream_positions(self) -> Dict[str, int]:
"""
Get the current positions of all the streams this store wants to subscribe to
Returns:
map from stream name to the most recent update we have for
that stream (ie, the point we want to start replicating from)
"""
pos = {}
if self._cache_id_gen:
pos["caches"] = self._cache_id_gen.get_current_token()
return pos
def get_cache_stream_token(self):
if self._cache_id_gen:
return self._cache_id_gen.get_current_token()
else:
return 0
def process_replication_rows(self, stream_name, token, rows):
if stream_name == "caches":
if self._cache_id_gen:
self._cache_id_gen.advance(token)
for row in rows:
if row.cache_func == CURRENT_STATE_CACHE_NAME:
if row.keys is None:
raise Exception(
"Can't send an 'invalidate all' for current state cache"
)
room_id = row.keys[0]
members_changed = set(row.keys[1:])
self._invalidate_state_caches(room_id, members_changed)
else:
self._attempt_to_invalidate_cache(row.cache_func, row.keys)
def _invalidate_cache_and_stream(self, txn, cache_func, keys):
txn.call_after(cache_func.invalidate, keys)
txn.call_after(self._send_invalidation_poke, cache_func, keys)
def _send_invalidation_poke(self, cache_func, keys):
self.hs.get_tcp_replication().send_invalidate_cache(cache_func, keys)
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