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-rw-r--r--synapse/federation/transport/server/federation.py15
1 files changed, 15 insertions, 0 deletions
diff --git a/synapse/federation/transport/server/federation.py b/synapse/federation/transport/server/federation.py
index 77bfd88ad0..beadfa422b 100644
--- a/synapse/federation/transport/server/federation.py
+++ b/synapse/federation/transport/server/federation.py
@@ -36,6 +36,7 @@ from synapse.util.ratelimitutils import FederationRateLimiter
 from synapse.util.versionstring import get_version_string
 
 logger = logging.getLogger(__name__)
+issue_8631_logger = logging.getLogger("synapse.8631_debug")
 
 
 class BaseFederationServerServlet(BaseFederationServlet):
@@ -95,6 +96,20 @@ class FederationSendServlet(BaseFederationServerServlet):
                 len(transaction_data.get("edus", [])),
             )
 
+            if issue_8631_logger.isEnabledFor(logging.DEBUG):
+                DEVICE_UPDATE_EDUS = {"m.device_list_update", "m.signing_key_update"}
+                device_list_updates = [
+                    edu.content
+                    for edu in transaction_data.get("edus", [])
+                    if edu.edu_type in DEVICE_UPDATE_EDUS
+                ]
+                if device_list_updates:
+                    issue_8631_logger.debug(
+                        "received transaction [%s] including device list updates: %s",
+                        transaction_id,
+                        device_list_updates,
+                    )
+
         except Exception as e:
             logger.exception(e)
             return 400, {"error": "Invalid transaction"}