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Update some docstrings and comments

This commit is contained in:
Richard van der Hoff 2019-11-08 12:18:20 +00:00
parent 772d414975
commit f8407975e7
1 changed files with 31 additions and 8 deletions
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39
synapse/handlers/federation.py
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@ -2040,8 +2040,10 @@ class FederationHandler(BaseHandler):
auth_events (dict[(str, str)->synapse.events.EventBase]):
Map from (event_type, state_key) to event
What we expect the event's auth_events to be, based on the event's
position in the dag. I think? maybe??
Normally, our calculated auth_events based on the state of the room
at the event's position in the DAG, though occasionally (eg if the
event is an outlier), may be the auth events claimed by the remote
server.
Also NB that this function adds entries to it.
Returns:
@ -2091,25 +2093,35 @@ class FederationHandler(BaseHandler):
origin (str):
event (synapse.events.EventBase):
context (synapse.events.snapshot.EventContext):
auth_events (dict[(str, str)->synapse.events.EventBase]):
Map from (event_type, state_key) to event
Normally, our calculated auth_events based on the state of the room
at the event's position in the DAG, though occasionally (eg if the
event is an outlier), may be the auth events claimed by the remote
server.
Also NB that this function adds entries to it.
Returns:
defer.Deferred[EventContext]: updated context
"""
event_auth_events = set(event.auth_event_ids())
# if the event's auth_events refers to events which are not in our
# calculated auth_events, we need to fetch those events from somewhere.
#
# we start by fetching them from the store, and then try calling /event_auth/.
# missing_auth is the set of the event's auth_events which we don't yet have
# in auth_events.
missing_auth = event_auth_events.difference(
e.event_id for e in auth_events.values()
)
# if we have missing events, we need to fetch those events from somewhere.
#
# we start by checking if they are in the store, and then try calling /event_auth/.
if missing_auth:
# TODO: can we use store.have_seen_events here instead?
have_events = yield self.store.get_seen_events_with_rejections(missing_auth)
logger.debug("Got events %s from store", have_events)
logger.debug("Found events %s in the store", have_events)
missing_auth.difference_update(have_events.keys())
else:
have_events = {}
@ -2164,15 +2176,23 @@ class FederationHandler(BaseHandler):
event.auth_event_ids()
)
except Exception:
# FIXME:
logger.exception("Failed to get auth chain")
if event.internal_metadata.is_outlier():
# XXX: given that, for an outlier, we'll be working with the
# event's *claimed* auth events rather than those we calculated:
# (a) is there any point in this test, since different_auth below will
# obviously be empty
# (b) alternatively, why don't we do it earlier?
logger.info("Skipping auth_event fetch for outlier")
return context
# FIXME: Assumes we have and stored all the state for all the
# prev_events
#
# FIXME: what does the fixme above mean? where do prev_events come into
# it, why do we care about the state for those events, and what does "have and
# stored" mean? Seems erik wrote it in c1d860870b
different_auth = event_auth_events.difference(
e.event_id for e in auth_events.values()
)
@ -2186,6 +2206,9 @@ class FederationHandler(BaseHandler):
different_auth,
)
# now we state-resolve between our own idea of the auth events, and the remote's
# idea of them.
room_version = yield self.store.get_room_version(event.room_id)
different_events = yield make_deferred_yieldable(