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Handle TimelineBatch being limited and empty.

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This hopefully addresses #5407 by gracefully handling an empty but
limited TimelineBatch. We also add some logging to figure out how this
is happening.
This commit is contained in:
Erik Johnston 2019-08-06 12:55:36 +01:00
parent 8ed9e63432
commit 6881f21f3e
1 changed files with 37 additions and 6 deletions
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31
synapse/handlers/sync.py
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@ -781,9 +781,17 @@ class SyncHandler(object):
lazy_load_members=lazy_load_members,
)
elif batch.limited:
if batch:
state_at_timeline_start = yield self.store.get_state_ids_for_event(
batch.events[0].event_id, state_filter=state_filter
)
else:
# Its not clear how we get here, but empirically we do
# (#5407). Logging has been added elsewhere to try and
# figure out where this state comes from.
state_at_timeline_start = yield self.get_state_at(
room_id, stream_position=now_token, state_filter=state_filter
)
# for now, we disable LL for gappy syncs - see
# https://github.com/vector-im/riot-web/issues/7211#issuecomment-419976346
@ -803,9 +811,17 @@ class SyncHandler(object):
room_id, stream_position=since_token, state_filter=state_filter
)
if batch:
current_state_ids = yield self.store.get_state_ids_for_event(
batch.events[-1].event_id, state_filter=state_filter
)
else:
# Its not clear how we get here, but empirically we do
# (#5407). Logging has been added elsewhere to try and
# figure out where this state comes from.
current_state_ids = yield self.get_state_at(
room_id, stream_position=now_token, state_filter=state_filter
)
state_ids = _calculate_state(
timeline_contains=timeline_state,
@ -1755,6 +1771,21 @@ class SyncHandler(object):
newly_joined_room=newly_joined,
)
if not batch and batch.limited:
# This resulted in #5407, which is weird, so lets log! We do it
# here as we have the maximum amount of information.
user_id = sync_result_builder.sync_config.user.to_string()
logger.info(
"Issue #5407: Found limited batch with no events. user %s, room %s,"
" sync_config %s, newly_joined %s, events %s, batch %s.",
user_id,
room_id,
sync_config,
newly_joined,
events,
batch,
)
if newly_joined:
# debug for https://github.com/matrix-org/synapse/issues/4422
issue4422_logger.debug(