diff options
Diffstat (limited to 'synapse/federation/federation_server.py')
| -rw-r--r-- | synapse/federation/federation_server.py | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index 682721cec7..247ddc89d5 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -31,9 +31,10 @@ 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 +from six import iteritems + # when processing incoming transactions, we try to handle multiple rooms in # parallel, up to this limit. TRANSACTION_CONCURRENCY_LIMIT = 10 @@ -213,16 +214,17 @@ 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)) @@ -426,9 +428,9 @@ class FederationServer(FederationBase): "Claimed one-time-keys: %s", ",".join(( "%s for %s:%s" % (key_id, user_id, device_id) - for user_id, user_keys in json_result.iteritems() - for device_id, device_keys in user_keys.iteritems() - for key_id, _ in device_keys.iteritems() + for user_id, user_keys in iteritems(json_result) + for device_id, device_keys in iteritems(user_keys) + for key_id, _ in iteritems(device_keys) )), ) |