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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 synapse.storage._base import SQLBaseStore
from synapse.storage.engines import PostgresEngine
from twisted.internet import defer
from ._slaved_id_tracker import SlavedIdTracker
import logging
logger = logging.getLogger(__name__)
class BaseSlavedStore(SQLBaseStore):
def __init__(self, db_conn, hs):
super(BaseSlavedStore, self).__init__(hs)
if isinstance(self.database_engine, PostgresEngine):
self._cache_id_gen = SlavedIdTracker(
db_conn, "cache_invalidation_stream", "stream_id",
)
else:
self._cache_id_gen = None
self.expire_cache_url = hs.config.worker_replication_url + "/expire_cache"
self.http_client = hs.get_simple_http_client()
def stream_positions(self):
pos = {}
if self._cache_id_gen:
pos["caches"] = self._cache_id_gen.get_current_token()
return pos
def process_replication(self, result):
stream = result.get("caches")
if stream:
for row in stream["rows"]:
(
position, cache_func, keys, invalidation_ts,
) = row
try:
getattr(self, cache_func).invalidate(tuple(keys))
except AttributeError:
# We probably haven't pulled in the cache in this worker,
# which is fine.
pass
self._cache_id_gen.advance(int(stream["position"]))
return defer.succeed(None)
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)
@defer.inlineCallbacks
def _send_invalidation_poke(self, cache_func, keys):
try:
yield self.http_client.post_json_get_json(self.expire_cache_url, {
"invalidate": [{
"name": cache_func.__name__,
"keys": list(keys),
}]
})
except:
logger.exception("Failed to poke on expire_cache")
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