diff --git a/synapse/appservice/api.py b/synapse/appservice/api.py
index 6893610e71..40c433d7ae 100644
--- a/synapse/appservice/api.py
+++ b/synapse/appservice/api.py
@@ -18,6 +18,7 @@ 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
@@ -192,9 +193,12 @@ class ApplicationServiceApi(SimpleHttpClient):
defer.returnValue(None)
key = (service.id, protocol)
- return self.protocol_meta_cache.get(key) or (
- self.protocol_meta_cache.set(key, _get())
- )
+ 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)
@defer.inlineCallbacks
def push_bulk(self, service, events, txn_id=None):
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index e15228e70b..a2327f24b6 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -18,6 +18,7 @@ from .federation_base import FederationBase
from .units import Transaction, Edu
from synapse.util import async
+from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
from synapse.util.logutils import log_function
from synapse.util.caches.response_cache import ResponseCache
from synapse.events import FrozenEvent
@@ -253,12 +254,13 @@ class FederationServer(FederationBase):
result = self._state_resp_cache.get((room_id, event_id))
if not result:
with (yield self._server_linearizer.queue((origin, room_id))):
- resp = yield self._state_resp_cache.set(
+ d = self._state_resp_cache.set(
(room_id, event_id),
- self._on_context_state_request_compute(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 result
+ resp = yield make_deferred_yieldable(result)
defer.returnValue((200, resp))
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index ae7c611170..5a47254b56 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -20,6 +20,7 @@ from ._base import BaseHandler
from synapse.api.constants import (
EventTypes, JoinRules,
)
+from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
from synapse.util.async import concurrently_execute
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.util.caches.response_cache import ResponseCache
@@ -81,11 +82,13 @@ class RoomListHandler(BaseHandler):
logger.info("No cached result, calculating one.")
result = self.response_cache.set(
key,
- self._get_public_room_list(
+ preserve_fn(self._get_public_room_list)(
limit, since_token, network_tuple=network_tuple
)
)
- return result
+ else:
+ logger.info("Using cached result.")
+ return make_deferred_yieldable(result)
@defer.inlineCallbacks
def _get_public_room_list(self, limit=None, since_token=None,
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 219529936f..b12988f3c9 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -15,7 +15,7 @@
from synapse.api.constants import Membership, EventTypes
from synapse.util.async import concurrently_execute
-from synapse.util.logcontext import LoggingContext
+from synapse.util.logcontext import LoggingContext, make_deferred_yieldable, preserve_fn
from synapse.util.metrics import Measure, measure_func
from synapse.util.caches.response_cache import ResponseCache
from synapse.push.clientformat import format_push_rules_for_user
@@ -184,11 +184,11 @@ class SyncHandler(object):
if not result:
result = self.response_cache.set(
sync_config.request_key,
- self._wait_for_sync_for_user(
+ preserve_fn(self._wait_for_sync_for_user)(
sync_config, since_token, timeout, full_state
)
)
- return result
+ return make_deferred_yieldable(result)
@defer.inlineCallbacks
def _wait_for_sync_for_user(self, sync_config, since_token, timeout,
diff --git a/synapse/util/caches/response_cache.py b/synapse/util/caches/response_cache.py
index df0ae099c8..00af539880 100644
--- a/synapse/util/caches/response_cache.py
+++ b/synapse/util/caches/response_cache.py
@@ -13,7 +13,6 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from synapse.util import logcontext
from synapse.util.async import ObservableDeferred
@@ -53,4 +52,4 @@ class ResponseCache(object):
return r
result.addBoth(remove)
- return logcontext.make_deferred_yieldable(result.observe())
+ return result.observe()
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