76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2016 OpenMarket Ltd
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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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from synapse.storage._base import SQLBaseStore
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from synapse.storage.engines import PostgresEngine
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from twisted.internet import defer
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from ._slaved_id_tracker import SlavedIdTracker
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import logging
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logger = logging.getLogger(__name__)
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class BaseSlavedStore(SQLBaseStore):
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def __init__(self, db_conn, hs):
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super(BaseSlavedStore, self).__init__(hs)
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if isinstance(self.database_engine, PostgresEngine):
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self._cache_id_gen = SlavedIdTracker(
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db_conn, "cache_invalidation_stream", "stream_id",
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)
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else:
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self._cache_id_gen = None
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self.expire_cache_url = hs.config.worker_replication_url + "/expire_cache"
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self.http_client = hs.get_simple_http_client()
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def stream_positions(self):
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pos = {}
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if self._cache_id_gen:
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pos["caches"] = self._cache_id_gen.get_current_token()
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return pos
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def process_replication(self, result):
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stream = result.get("caches")
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if stream:
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for row in stream["rows"]:
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(
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position, cache_func, keys, invalidation_ts,
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) = row
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try:
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getattr(self, cache_func).invalidate(tuple(keys))
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except AttributeError:
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logger.info("Got unexpected cache_func: %r", cache_func)
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self._cache_id_gen.advance(int(stream["position"]))
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return defer.succeed(None)
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def _invalidate_cache_and_stream(self, txn, cache_func, keys):
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txn.call_after(cache_func.invalidate, keys)
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txn.call_after(self._send_invalidation_poke, cache_func, keys)
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@defer.inlineCallbacks
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def _send_invalidation_poke(self, cache_func, keys):
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try:
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yield self.http_client.post_json_get_json(self.expire_cache_url, {
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"invalidate": [{
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"name": cache_func.__name__,
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"keys": list(keys),
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}]
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})
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except:
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logger.exception("Failed to poke on expire_cache")
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