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Merge pull request #3093 from matrix-org/rav/response_cache_wrap

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Refactor ResponseCache usage
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Richard van der Hoff 2018-04-20 11:31:17 +01:00 • committed by GitHub
commit 11a67b7c9d
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6 changed files with 110 additions and 78 deletions
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22
synapse/federation/federation_server.py
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@ -30,7 +30,6 @@ import synapse.metrics
from synapse.types import get_domain_from_id
from synapse.util import async
from synapse.util.caches.response_cache import ResponseCache
from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
from synapse.util.logutils import log_function
# when processing incoming transactions, we try to handle multiple rooms in
@ -212,16 +211,17 @@ class FederationServer(FederationBase):
if not in_room:
raise AuthError(403, "Host not in room.")
result = self._state_resp_cache.get((room_id, event_id))
if not result:
with (yield self._server_linearizer.queue((origin, room_id))):
d = self._state_resp_cache.set(
(room_id, event_id),
preserve_fn(self._on_context_state_request_compute)(room_id, event_id)
)
resp = yield make_deferred_yieldable(d)
else:
resp = yield make_deferred_yieldable(result)
# we grab the linearizer to protect ourselves from servers which hammer
# us. In theory we might already have the response to this query
# in the cache so we could return it without waiting for the linearizer
# - but that's non-trivial to get right, and anyway somewhat defeats
# the point of the linearizer.
with (yield self._server_linearizer.queue((origin, room_id))):
resp = yield self._state_resp_cache.wrap(
(room_id, event_id),
self._on_context_state_request_compute,
room_id, event_id,
)
defer.returnValue((200, resp))