Add logging for live debugging

Author: turt2live

synapse/handlers/room_policy.py

@@ -58,24 +58,29 @@ async def is_event_allowed(self, event: EventBase) -> bool:
             event.room_id, "org.matrix.msc4284.policy", ""
         )
         if not policy_event:
+            logger.info("Allowing %s due to no policy event", event.event_id)
             return True  # no policy server == default allow
 
         policy_server = policy_event.content.get("via", "")
         if policy_server is None or not isinstance(policy_server, str):
+            logger.info("Allowing %s due to missing via", event.event_id)
             return True  # no policy server == default allow
 
         if policy_server == self._hs.hostname:
+            logger.info("Allowing %s due to self policy server", event.event_id)
             return True  # Synapse itself can't be a policy server (currently)
 
         try:
             parse_and_validate_server_name(policy_server)
         except ValueError:
+            logger.info("Allowing %s due to invalid policy server name", event.event_id)
             return True  # invalid policy server == default allow
 
         is_in_room = await self._event_auth_handler.is_host_in_room(
             event.room_id, policy_server
         )
         if not is_in_room:
+            logger.info("Allowing %s due to policy server not in room", event.event_id)
             return True  # policy server not in room == default allow
 
         # At this point, the server appears valid and is in the room, so ask it to check
@@ -84,6 +89,8 @@ async def is_event_allowed(self, event: EventBase) -> bool:
             policy_server, event
         )
         if recommendation != RECOMMENDATION_OK:
+            logger.info("Denying %s due to policy server", event.event_id)
             return False
 
+        logger.info("Allowing %s due to policy server saying so", event.event_id)
         return True  # default allow