diff options
Diffstat (limited to 'synapse/federation/federation_server.py')
| -rw-r--r-- | synapse/federation/federation_server.py | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index fa61dd8c10..a90d99c4d6 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -63,6 +63,7 @@ from synapse.federation.federation_base import ( ) from synapse.federation.persistence import TransactionActions from synapse.federation.units import Edu, Transaction +from synapse.handlers.worker_lock import DELETE_ROOM_LOCK_NAME from synapse.http.servlet import assert_params_in_dict from synapse.logging.context import ( make_deferred_yieldable, @@ -137,6 +138,7 @@ class FederationServer(FederationBase): self._event_auth_handler = hs.get_event_auth_handler() self._room_member_handler = hs.get_room_member_handler() self._e2e_keys_handler = hs.get_e2e_keys_handler() + self._worker_lock_handler = hs.get_worker_locks_handler() self._state_storage_controller = hs.get_storage_controllers().state @@ -1236,9 +1238,18 @@ class FederationServer(FederationBase): logger.info("handling received PDU in room %s: %s", room_id, event) try: with nested_logging_context(event.event_id): - await self._federation_event_handler.on_receive_pdu( - origin, event - ) + # We're taking out a lock within a lock, which could + # lead to deadlocks if we're not careful. However, it is + # safe on this occasion as we only ever take a write + # lock when deleting a room, which we would never do + # while holding the `_INBOUND_EVENT_HANDLING_LOCK_NAME` + # lock. + async with self._worker_lock_handler.acquire_read_write_lock( + DELETE_ROOM_LOCK_NAME, room_id, write=False + ): + await self._federation_event_handler.on_receive_pdu( + origin, event + ) except FederationError as e: # XXX: Ideally we'd inform the remote we failed to process # the event, but we can't return an error in the transaction |