Skip federation processing for events from bridged senders

Author: Fizzadar

synapse/federation/sender/__init__.py

@@ -379,6 +379,10 @@ async def handle_event(event: EventBase) -> None:
                         logger.debug("Not sending remote-origin event %s", event)
                         return
 
+                    # Beeper hack: don't bother handling federation for bridged events
+                    if event.sender.startswith("@_"):
+                        return
+
                     # We also want to not send out-of-band membership events.
                     #
                     # OOB memberships are used in three (and a half) situations:

synapse/handlers/message.py

@@ -1430,6 +1430,11 @@ async def cache_joined_hosts_for_event(
         if not self._external_cache.is_enabled():
             return
 
+        # Beeper hack: we don't need joined hosts for bridged events because
+        # we don't federate them.
+        if event.sender.startswith("@_"):
+            return
+
         # If external cache is enabled we should always have this.
         assert self._external_cache_joined_hosts_updates is not None