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