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Diffstat (limited to '')
| -rw-r--r-- | synapse/handlers/federation.py | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py index 310db3fb46..1296e22af6 100644 --- a/synapse/handlers/federation.py +++ b/synapse/handlers/federation.py @@ -542,9 +542,16 @@ class FederationHandler(BaseHandler): def backfill(self, dest, room_id, limit, extremities): """ Trigger a backfill request to `dest` for the given `room_id` - This will attempt to get more events from the remote. This may return - be successfull and still return no events if the other side has no new - events to offer. + This will attempt to get more events from the remote. If the other side + has no new events to offer, this will return an empty list. + + As the events are received, we check their signatures, and also do some + sanity-checking on them. If any of the backfilled events are invalid, + this method throws a SynapseError. + + TODO: make this more useful to distinguish failures of the remote + server from invalid events (there is probably no point in trying to + re-fetch invalid events from every other HS in the room.) """ if dest == self.server_name: raise SynapseError(400, "Can't backfill from self.") @@ -556,6 +563,8 @@ class FederationHandler(BaseHandler): extremities=extremities, ) + # do some sanity-checking of the received events, before we go and + # do state resolution across 1000 events. for ev in events: self._sanity_check_event(ev) |