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Add comments and paranoia

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This commit is contained in:
Erik Johnston 2019-02-25 10:02:12 +00:00
parent 7b288826b7
commit 9342cc6ab1
1 changed files with 23 additions and 2 deletions
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25
synapse/handlers/federation.py
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@ -770,6 +770,18 @@ class FederationHandler(BaseHandler):
set(auth_events.keys()) | set(state_events.keys())
)
# We now have a chunk of events plus associated state and auth chain to
# persist. We do the persistence in two steps:
# 1. Auth events and state get persisted as outliers, plus the
# backward extremities get persisted (as non-outliers).
# 2. The rest of the events in the chunk get persisted one by one, as
# each one depends on the previous event for its state.
#
# The important thing is that events in the chunk get persisted as
# non-outliers, including when those events are also in the state or
# auth chain. Caution must therefore be taken to ensure that they are
# not accidentally marked as outliers.
ev_infos = []
for a in auth_events.values():
# We only want to persist auth events as outliers that we haven't
@ -789,13 +801,18 @@ class FederationHandler(BaseHandler):
})
for e_id in events_to_state:
# For paranoia we ensure that these events are marked as
# non-outliers
ev = event_map[e_id]
ev.internal_metadata.outlier = False
ev_infos.append({
"event": event_map[e_id],
"event": ev,
"state": events_to_state[e_id],
"auth_events": {
(auth_events[a_id].type, auth_events[a_id].state_key):
auth_events[a_id]
for a_id in event_map[e_id].auth_event_ids()
for a_id in ev.auth_event_ids()
if a_id in auth_events
}
})
@ -811,6 +828,10 @@ class FederationHandler(BaseHandler):
if event in events_to_state:
continue
# For paranoia we ensure that these events are marked as
# non-outliers
event.internal_metadata.outlier = False
# We store these one at a time since each event depends on the
# previous to work out the state.
# TODO: We can probably do something more clever here.