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Refactor ResponseCache usage

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Adds a `.wrap` method to ResponseCache which wraps up the boilerplate of a
(get, set) pair, and then use it throughout the codebase.

This will be largely non-functional, but does include the following functional
changes:

* federation_server.on_context_state_request: drops use of _server_linearizer
  which looked redundant and could cause incorrect cache misses by yielding
  between the get and the set.
* RoomListHandler.get_remote_public_room_list(): fixes logcontext leaks
* the wrap function includes some logging. I'm hoping this won't be too noisy
  on production.
This commit is contained in:
Richard van der Hoff 2018-04-12 12:08:59 +01:00
parent d5c74b9f6c
commit b78395b7fe
6 changed files with 86 additions and 66 deletions
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8
synapse/appservice/api.py
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@ -18,7 +18,6 @@ from synapse.api.constants import ThirdPartyEntityKind
from synapse.api.errors import CodeMessageException
from synapse.http.client import SimpleHttpClient
from synapse.events.utils import serialize_event
from synapse.util.logcontext import preserve_fn, make_deferred_yieldable
from synapse.util.caches.response_cache import ResponseCache
from synapse.types import ThirdPartyInstanceID
@ -194,12 +193,7 @@ class ApplicationServiceApi(SimpleHttpClient):
defer.returnValue(None)
key = (service.id, protocol)
result = self.protocol_meta_cache.get(key)
if not result:
result = self.protocol_meta_cache.set(
key, preserve_fn(_get)()
)
return make_deferred_yieldable(result)
return self.protocol_meta_cache.wrap(key, _get)
@defer.inlineCallbacks
def push_bulk(self, service, events, txn_id=None):