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-rw-r--r--synapse/handlers/federation.py28
1 files changed, 15 insertions, 13 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 328f8f4842..fe3092b14b 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -26,7 +26,9 @@ from synapse.api.errors import (
 from synapse.api.constants import EventTypes, Membership, RejectedReason
 from synapse.events.validator import EventValidator
 from synapse.util import unwrapFirstError
-from synapse.util.logcontext import PreserveLoggingContext, preserve_fn
+from synapse.util.logcontext import (
+    PreserveLoggingContext, preserve_fn, preserve_context_over_deferred
+)
 from synapse.util.logutils import log_function
 from synapse.util.async import run_on_reactor
 from synapse.util.frozenutils import unfreeze
@@ -361,9 +363,9 @@ class FederationHandler(BaseHandler):
                     missing_auth - failed_to_fetch
                 )
 
-                results = yield defer.gatherResults(
+                results = yield preserve_context_over_deferred(defer.gatherResults(
                     [
-                        self.replication_layer.get_pdu(
+                        preserve_fn(self.replication_layer.get_pdu)(
                             [dest],
                             event_id,
                             outlier=True,
@@ -372,7 +374,7 @@ class FederationHandler(BaseHandler):
                         for event_id in missing_auth - failed_to_fetch
                     ],
                     consumeErrors=True
-                ).addErrback(unwrapFirstError)
+                )).addErrback(unwrapFirstError)
                 auth_events.update({a.event_id: a for a in results})
                 required_auth.update(
                     a_id for event in results for a_id, _ in event.auth_events
@@ -552,10 +554,10 @@ class FederationHandler(BaseHandler):
 
         event_ids = list(extremities.keys())
 
-        states = yield defer.gatherResults([
-            self.state_handler.resolve_state_groups(room_id, [e])
+        states = yield preserve_context_over_deferred(defer.gatherResults([
+            preserve_fn(self.state_handler.resolve_state_groups)(room_id, [e])
             for e in event_ids
-        ])
+        ]))
         states = dict(zip(event_ids, [s[1] for s in states]))
 
         for e_id, _ in sorted_extremeties_tuple:
@@ -1166,9 +1168,9 @@ class FederationHandler(BaseHandler):
         a bunch of outliers, but not a chunk of individual events that depend
         on each other for state calculations.
         """
-        contexts = yield defer.gatherResults(
+        contexts = yield preserve_context_over_deferred(defer.gatherResults(
             [
-                self._prep_event(
+                preserve_fn(self._prep_event)(
                     origin,
                     ev_info["event"],
                     state=ev_info.get("state"),
@@ -1176,7 +1178,7 @@ class FederationHandler(BaseHandler):
                 )
                 for ev_info in event_infos
             ]
-        )
+        ))
 
         yield self.store.persist_events(
             [
@@ -1460,9 +1462,9 @@ class FederationHandler(BaseHandler):
             # Do auth conflict res.
             logger.info("Different auth: %s", different_auth)
 
-            different_events = yield defer.gatherResults(
+            different_events = yield preserve_context_over_deferred(defer.gatherResults(
                 [
-                    self.store.get_event(
+                    preserve_fn(self.store.get_event)(
                         d,
                         allow_none=True,
                         allow_rejected=False,
@@ -1471,7 +1473,7 @@ class FederationHandler(BaseHandler):
                     if d in have_events and not have_events[d]
                 ],
                 consumeErrors=True
-            ).addErrback(unwrapFirstError)
+            )).addErrback(unwrapFirstError)
 
             if different_events:
                 local_view = dict(auth_events)