Stop backpaginating when events not visible

This commit is contained in:
Erik Johnston 2019-02-20 16:54:35 +00:00
parent 82fca11fc1
commit 71b625d808
3 changed files with 78 additions and 5 deletions

View file

@ -830,6 +830,37 @@ class FederationHandler(BaseHandler):
logger.debug("Not backfilling as no extremeties found.")
return
# We only want to paginate if we can actually see the events we'll get,
# as otherwise we'll just spend a lot of resources to get redacted
# events.
#
# We do this by filtering all the extremities and seeing if any remain.
# Given we don't have the extremity events themselves, we need to
# actually check the events that references them.
#
# TODO: Filter the list of extremities if we do do a backfill
# TODO: Correctly handle the case where we are allowed to see the
# forward event but not the extremity, e.g. in the case of initial
# join of the server.
forward_events = yield self.store.get_forward_events(
list(extremities),
)
extremities_events = yield self.store.get_events(
forward_events,
check_redacted=False,
get_prev_content=False,
)
filtered_extremities = yield filter_events_for_server(
self.store, self.server_name, list(extremities_events.values()),
redact=False,
)
if not filtered_extremities:
defer.returnValue(False)
# Check if we reached a point where we should start backfilling.
sorted_extremeties_tuple = sorted(
extremities.items(),

View file

@ -442,6 +442,28 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore,
event_results.reverse()
return event_results
@defer.inlineCallbacks
def get_forward_events(self, event_ids):
"""Fetch all events that have the given events as a prev event
Args:
event_ids (iterable[str])
Returns:
Deferred[list[str]]
"""
rows = yield self._simple_select_many_batch(
table="event_edges",
column="prev_event_id",
iterable=event_ids,
retcols=("event_id",),
desc="get_forward_events"
)
defer.returnValue([
row["event_id"] for row in rows
])
class EventFederationStore(EventFederationWorkerStore):
""" Responsible for storing and serving up the various graphs associated

View file

@ -216,7 +216,20 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
@defer.inlineCallbacks
def filter_events_for_server(store, server_name, events):
def filter_events_for_server(store, server_name, events, redact=True):
"""Filter a list of events based on whether given server is allowed to
see them.
Args:
store (DataStore)
server_name (str)
events (iterable[FrozenEvent])
redact (bool): Whether to return a redacted version of the event, or
to filter them out entirely.
Returns
Deferred[list[FrozenEvent]]
"""
# Whatever else we do, we need to check for senders which have requested
# erasure of their data.
erased_senders = yield store.are_users_erased(
@ -231,7 +244,10 @@ def filter_events_for_server(store, server_name, events):
"Sender of %s has been erased, redacting",
event.event_id,
)
if redact:
return prune_event(event)
else:
return None
# state will be None if we decided we didn't need to filter by
# room membership.
@ -265,7 +281,10 @@ def filter_events_for_server(store, server_name, events):
return event
else:
# server has no users in the room: redact
if redact:
return prune_event(event)
else:
return None
return event
@ -361,7 +380,8 @@ def filter_events_for_server(store, server_name, events):
for e_id, key_to_eid in iteritems(event_to_state_ids)
}
defer.returnValue([
to_return = (
redact_disallowed(e, event_to_state[e.event_id])
for e in events
])
)
defer.returnValue([e for e in to_return if e is not None])