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https://github.com/element-hq/synapse
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81c06bec20
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956f20ef74
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@ -123,8 +123,6 @@ class CurrentStateDeltaMembership:
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room_id: The room ID of the membership event.
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membership: The membership state of the user in the room
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sender: The person who sent the membership event
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state_reset: Whether the membership in the room was changed without a
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corresponding event (state reset).
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"""
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event_id: Optional[str]
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@ -133,7 +131,6 @@ class CurrentStateDeltaMembership:
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room_id: str
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membership: str
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sender: Optional[str]
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state_reset: bool
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def generate_pagination_where_clause(
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@ -849,15 +846,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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min_from_id = from_key.stream
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max_to_id = to_key.get_max_stream_pos()
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args: List[Any] = [
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EventTypes.Member,
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user_id,
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user_id,
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min_from_id,
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max_to_id,
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EventTypes.Member,
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user_id,
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]
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args: List[Any] = [min_from_id, max_to_id, user_id, EventTypes.Member]
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# TODO: It would be good to assert that the `from_token`/`to_token` is >=
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# the first row in `current_state_delta_stream` for the rooms we're
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@ -870,44 +859,38 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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# `stream_ordering` is unique across the Synapse instance so this should
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# work fine.
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#
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# We `COALESCE` the `stream_ordering` because we prefer the source of truth
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# from the `events` table. This gives slightly more accurate results when
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# available since `current_state_delta_stream` only tracks that the current
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# state is at this stream position (not what stream position the state event
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# was added) and uses the *minimum* stream position for batches of events.
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# We `COALESCE` the `instance_name` and `stream_ordering` because we prefer
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# the source of truth from the events table. This gives slightly more
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# accurate results when available since `current_state_delta_stream` only
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# tracks that the current state is at this stream position (not what stream
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# position the state event was added) and batches events at the same
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# `stream_id` in certain cases.
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#
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# The extra `LEFT JOIN` by stream position are only needed to tell a state
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# reset from the server leaving the room. Both cases have `event_id = null`
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# but if we can find a corresponding event at that stream position, then we
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# know it was just the server leaving the room.
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# TODO: We need to add indexes for `current_state_delta_stream.event_id` and
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# `current_state_delta_stream.state_key`/`current_state_delta_stream.type`
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# for this to be efficient.
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sql = """
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SELECT
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COALESCE(e.event_id, e_by_stream.event_id) AS event_id,
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e.event_id,
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s.prev_event_id,
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s.room_id,
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s.instance_name,
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COALESCE(e.stream_ordering, e_by_stream.stream_ordering, s.stream_id) AS stream_ordering,
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COALESCE(m.membership, m_by_stream.membership) AS membership,
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COALESCE(e.sender, e_by_stream.sender) AS sender,
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m_prev.membership AS prev_membership
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COALESCE(e.instance_name, s.instance_name),
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COALESCE(e.stream_ordering, s.stream_id),
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m.membership,
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e.sender
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FROM current_state_delta_stream AS s
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LEFT JOIN events AS e ON e.event_id = s.event_id
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LEFT JOIN room_memberships AS m ON m.event_id = s.event_id
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LEFT JOIN room_memberships AS m_prev ON s.prev_event_id = m_prev.event_id
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LEFT JOIN events AS e_by_stream ON e_by_stream.stream_ordering = s.stream_id
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AND e_by_stream.type = ?
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AND e_by_stream.state_key = ?
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LEFT JOIN room_memberships AS m_by_stream ON m_by_stream.event_stream_ordering = s.stream_id
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AND m_by_stream.user_id = ?
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WHERE s.stream_id > ? AND s.stream_id <= ?
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AND s.type = ?
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AND s.state_key = ?
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AND s.type = ?
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ORDER BY s.stream_id ASC
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"""
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txn.execute(sql, args)
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membership_changes: List[CurrentStateDeltaMembership] = []
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membership_change_map: Dict[str, CurrentStateDeltaMembership] = {}
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for (
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event_id,
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prev_event_id,
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@ -916,7 +899,6 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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stream_ordering,
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membership,
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sender,
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prev_membership,
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) in txn:
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assert room_id is not None
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assert instance_name is not None
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@ -932,17 +914,21 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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# `event_id = null` for all current state. This means we might
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# already have a row for the leave event and then another for the
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# same leave where the `event_id=null` but the `prev_event_id` is
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# pointing back at the earlier leave event. We don't want to report
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# the leave, if we already have a leave event.
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if event_id is None and prev_membership == Membership.LEAVE:
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# pointing back at the earlier leave event. Since we're assuming the
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# `event_id = null` row is a `leave` and we don't want duplicate
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# membership changes in our results, let's get rid of those
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# (deduplicate) (see `test_server_left_after_us_room`).
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if event_id is None:
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already_tracked_membership_change = membership_change_map.get(
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prev_event_id
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)
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if (
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already_tracked_membership_change is not None
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and already_tracked_membership_change.membership
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== Membership.LEAVE
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):
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continue
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# We can detect a state reset if there was a membership change
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# without a corresponding event.
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state_reset = False
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if event_id is None and membership != prev_membership:
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state_reset = True
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membership_change = CurrentStateDeltaMembership(
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event_id=event_id,
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event_pos=PersistedEventPosition(
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@ -955,10 +941,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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membership if membership is not None else Membership.LEAVE
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),
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sender=sender,
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state_reset=state_reset,
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)
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membership_changes.append(membership_change)
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if event_id:
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membership_change_map[event_id] = membership_change
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return membership_changes
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@ -615,7 +615,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user1_id,
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state_reset=False,
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)
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],
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)
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@ -717,7 +716,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user1_id,
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state_reset=False,
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),
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CurrentStateDeltaMembership(
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event_id=leave_response1["event_id"],
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@ -726,7 +724,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="leave",
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sender=user1_id,
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state_reset=False,
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),
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],
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)
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@ -788,9 +785,9 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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def test_we_cause_server_left_room(self) -> None:
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"""
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Test that when probing over part of the DAG where the user leaves the room
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causing the server to leave the room (because we were the last local user in the
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room), we still see the join and leave changes.
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Test that when probing over part of the DAG where we leave the room causing the
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server to leave the room (because we were the last local user in the room), we
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still see the join and leave changes.
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This is to make sure we play nicely with this behavior: When the server leaves a
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room, it will insert new rows with `event_id = null` into the
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@ -885,16 +882,14 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user1_id,
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state_reset=False,
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),
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CurrentStateDeltaMembership(
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event_id=leave_response1["event_id"],
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event_id=None, # leave_response1["event_id"],
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event_pos=leave_pos1,
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prev_event_id=join_response1["event_id"],
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room_id=room_id1,
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membership="leave",
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sender=user1_id,
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state_reset=False,
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sender=None, # user1_id,
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),
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],
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)
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@ -1009,7 +1004,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user3_id,
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state_reset=False,
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),
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],
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)
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@ -1025,7 +1019,7 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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user2_tok = self.login(user2_id, "pass")
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room_id1 = self.helper.create_room_as(user2_id, tok=user2_tok)
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join_response1 = self.helper.join(room_id1, user1_id, tok=user1_tok)
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self.helper.join(room_id1, user1_id, tok=user1_tok)
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before_reset_token = self.event_sources.get_current_token()
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@ -1062,7 +1056,8 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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"type": EventTypes.Member,
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"state_key": user1_id,
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"event_id": None,
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"prev_event_id": join_response1["event_id"],
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# FIXME: I'm not sure if a state reset should have a prev_event_id
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"prev_event_id": None,
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"instance_name": dummy_state_pos.instance_name,
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},
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desc="state reset user in current_state_delta_stream",
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@ -1093,11 +1088,10 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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CurrentStateDeltaMembership(
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event_id=None,
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event_pos=dummy_state_pos,
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prev_event_id=join_response1["event_id"],
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prev_event_id=None,
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room_id=room_id1,
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membership="leave",
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sender=None, # user1_id,
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state_reset=True,
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),
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],
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)
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@ -1148,7 +1142,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user1_id,
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state_reset=False,
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),
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CurrentStateDeltaMembership(
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event_id=join_response2["event_id"],
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@ -1157,7 +1150,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id2,
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membership="join",
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sender=user1_id,
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state_reset=False,
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),
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],
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)
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@ -1184,7 +1176,6 @@ class GetCurrentStateDeltaMembershipChangesForUserTestCase(HomeserverTestCase):
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room_id=room_id1,
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membership="join",
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sender=user1_id,
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state_reset=False,
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)
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],
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)
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@ -1378,7 +1369,6 @@ class GetCurrentStateDeltaMembershipChangesForUserFederationTestCase(
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room_id=intially_unjoined_room_id,
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membership="join",
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sender=user1_id,
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state_reset=False,
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),
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],
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)
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