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get rid of (most of) have_events from _update_auth_events_and_context_for_auth (#6468)

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have_events was a map from event_id to rejection reason (or None) for events
which are in our local database. It was used as filter on the list of
event_ids being passed into get_events_as_list. However, since
get_events_as_list will ignore any event_ids that are unknown or rejected, we
can equivalently just leave it to get_events_as_list to do the filtering.

That means that we don't have to keep `have_events` up-to-date, and can use
`have_seen_events` instead of `get_seen_events_with_rejection` in the one place
we do need it.
This commit is contained in:
Richard van der Hoff 2019-12-04 17:27:32 +00:00 committed by GitHub
parent 3eb15c01d9
commit e203874caa
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3 changed files with 25 additions and 72 deletions
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1
changelog.d/6468.misc Normal file
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@ -0,0 +1 @@
Refactor some code in the event authentication path for clarity.

24
synapse/handlers/federation.py
View file

@ -2122,14 +2122,9 @@ class FederationHandler(BaseHandler):
#
# 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("Found events %s in the store", have_events)
missing_auth.difference_update(have_events.keys())
else:
have_events = {}
have_events.update({e.event_id: "" for e in auth_events.values()})
have_events = yield self.store.have_seen_events(missing_auth)
logger.debug("Events %s are in the store", have_events)
missing_auth.difference_update(have_events)
if missing_auth:
# If we don't have all the auth events, we need to get them.
@ -2175,9 +2170,6 @@ class FederationHandler(BaseHandler):
except AuthError:
pass
have_events = yield self.store.get_seen_events_with_rejections(
event.auth_event_ids()
)
except Exception:
logger.exception("Failed to get auth chain")
@ -2207,23 +2199,17 @@ class FederationHandler(BaseHandler):
# idea of them.
room_version = yield self.store.get_room_version(event.room_id)
different_event_ids = [
d for d in different_auth if d in have_events and not have_events[d]
]
if different_event_ids:
# XXX: currently this checks for redactions but I'm not convinced that is
# necessary?
different_events = yield self.store.get_events_as_list(different_event_ids)
different_events = yield self.store.get_events_as_list(different_auth)
local_view = dict(auth_events)
remote_view = dict(auth_events)
remote_view.update({(d.type, d.state_key): d for d in different_events})
new_state = yield self.state_handler.resolve_events(
room_version,
[list(local_view.values()), list(remote_view.values())],
event,
room_version, [list(local_view.values()), list(remote_view.values())], event
)
logger.info(

34
synapse/storage/data_stores/main/events_worker.py
View file

@ -783,40 +783,6 @@ class EventsWorkerStore(SQLBaseStore):
yield self.runInteraction("have_seen_events", have_seen_events_txn, chunk)
return results
def get_seen_events_with_rejections(self, event_ids):
"""Given a list of event ids, check if we rejected them.
Args:
event_ids (list[str])
Returns:
Deferred[dict[str, str|None):
Has an entry for each event id we already have seen. Maps to
the rejected reason string if we rejected the event, else maps
to None.
"""
if not event_ids:
return defer.succeed({})
def f(txn):
sql = (
"SELECT e.event_id, reason FROM events as e "
"LEFT JOIN rejections as r ON e.event_id = r.event_id "
"WHERE e.event_id = ?"
)
res = {}
for event_id in event_ids:
txn.execute(sql, (event_id,))
row = txn.fetchone()
if row:
_, rejected = row
res[event_id] = rejected
return res
return self.runInteraction("get_seen_events_with_rejections", f)
def _get_total_state_event_counts_txn(self, txn, room_id):
"""
See get_total_state_event_counts.