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-rw-r--r--synapse/federation/federation_base.py22
1 files changed, 22 insertions, 0 deletions
diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py
index 2522bf78fc..4269a98db2 100644
--- a/synapse/federation/federation_base.py
+++ b/synapse/federation/federation_base.py
@@ -23,6 +23,7 @@ from synapse.crypto.keyring import Keyring
 from synapse.events import EventBase, make_event_from_dict
 from synapse.events.utils import prune_event, validate_canonicaljson
 from synapse.http.servlet import assert_params_in_dict
+from synapse.logging.opentracing import log_kv, trace
 from synapse.types import JsonDict, get_domain_from_id
 
 if TYPE_CHECKING:
@@ -55,6 +56,7 @@ class FederationBase:
         self._clock = hs.get_clock()
         self._storage_controllers = hs.get_storage_controllers()
 
+    @trace
     async def _check_sigs_and_hash(
         self, room_version: RoomVersion, pdu: EventBase
     ) -> EventBase:
@@ -97,17 +99,36 @@ class FederationBase:
                     "Event %s seems to have been redacted; using our redacted copy",
                     pdu.event_id,
                 )
+                log_kv(
+                    {
+                        "message": "Event seems to have been redacted; using our redacted copy",
+                        "event_id": pdu.event_id,
+                    }
+                )
             else:
                 logger.warning(
                     "Event %s content has been tampered, redacting",
                     pdu.event_id,
                 )
+                log_kv(
+                    {
+                        "message": "Event content has been tampered, redacting",
+                        "event_id": pdu.event_id,
+                    }
+                )
             return redacted_event
 
         spam_check = await self.spam_checker.check_event_for_spam(pdu)
 
         if spam_check != self.spam_checker.NOT_SPAM:
             logger.warning("Event contains spam, soft-failing %s", pdu.event_id)
+            log_kv(
+                {
+                    "message": "Event contains spam, redacting (to save disk space) "
+                    "as well as soft-failing (to stop using the event in prev_events)",
+                    "event_id": pdu.event_id,
+                }
+            )
             # we redact (to save disk space) as well as soft-failing (to stop
             # using the event in prev_events).
             redacted_event = prune_event(pdu)
@@ -117,6 +138,7 @@ class FederationBase:
         return pdu
 
 
+@trace
 async def _check_sigs_on_pdu(
     keyring: Keyring, room_version: RoomVersion, pdu: EventBase
 ) -> None: