Reinstate linearizer for federation_server.on_context_state_request
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@ -211,11 +211,17 @@ class FederationServer(FederationBase):
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if not in_room:
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raise AuthError(403, "Host not in room.")
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resp = yield self._state_resp_cache.wrap(
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(room_id, event_id),
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self._on_context_state_request_compute,
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room_id, event_id,
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)
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# we grab the linearizer to protect ourselves from servers which hammer
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# us. In theory we might already have the response to this query
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# in the cache so we could return it without waiting for the linearizer
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# - but that's non-trivial to get right, and anyway somewhat defeats
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# the point of the linearizer.
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with (yield self._server_linearizer.queue((origin, room_id))):
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resp = yield self._state_resp_cache.wrap(
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(room_id, event_id),
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self._on_context_state_request_compute,
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room_id, event_id,
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)
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defer.returnValue((200, resp))
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