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Don't pull out the full state when storing state (#13274)
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3343035a06
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changelog.d/13274.misc
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1
changelog.d/13274.misc
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@ -0,0 +1 @@
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Don't pull out state in `compute_event_context` for unconflicted state.
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@ -298,12 +298,18 @@ class StateHandler:
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state_group_before_event_prev_group = entry.prev_group
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deltas_to_state_group_before_event = entry.delta_ids
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state_ids_before_event = None
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# We make sure that we have a state group assigned to the state.
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if entry.state_group is None:
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state_ids_before_event = await entry.get_state(
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self._state_storage_controller, StateFilter.all()
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)
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# store_state_group requires us to have either a previous state group
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# (with deltas) or the complete state map. So, if we don't have a
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# previous state group, load the complete state map now.
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if state_group_before_event_prev_group is None:
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state_ids_before_event = await entry.get_state(
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self._state_storage_controller, StateFilter.all()
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)
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state_group_before_event = (
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await self._state_storage_controller.store_state_group(
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event.event_id,
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@ -316,7 +322,6 @@ class StateHandler:
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entry.state_group = state_group_before_event
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else:
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state_group_before_event = entry.state_group
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state_ids_before_event = None
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#
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# now if it's not a state event, we're done
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@ -336,19 +341,20 @@ class StateHandler:
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#
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# otherwise, we'll need to create a new state group for after the event
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#
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if state_ids_before_event is None:
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state_ids_before_event = await entry.get_state(
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self._state_storage_controller, StateFilter.all()
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)
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key = (event.type, event.state_key)
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if key in state_ids_before_event:
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replaces = state_ids_before_event[key]
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if replaces != event.event_id:
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event.unsigned["replaces_state"] = replaces
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state_ids_after_event = dict(state_ids_before_event)
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state_ids_after_event[key] = event.event_id
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if state_ids_before_event is not None:
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replaces = state_ids_before_event.get(key)
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else:
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replaces_state_map = await entry.get_state(
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self._state_storage_controller, StateFilter.from_types([key])
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)
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replaces = replaces_state_map.get(key)
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if replaces and replaces != event.event_id:
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event.unsigned["replaces_state"] = replaces
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delta_ids = {key: event.event_id}
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state_group_after_event = (
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@ -357,7 +363,7 @@ class StateHandler:
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event.room_id,
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prev_group=state_group_before_event,
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delta_ids=delta_ids,
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current_state_ids=state_ids_after_event,
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current_state_ids=None,
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)
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)
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@ -346,7 +346,7 @@ class StateStorageController:
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room_id: str,
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prev_group: Optional[int],
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delta_ids: Optional[StateMap[str]],
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current_state_ids: StateMap[str],
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current_state_ids: Optional[StateMap[str]],
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) -> int:
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"""Store a new set of state, returning a newly assigned state group.
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@ -400,14 +400,17 @@ class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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room_id: str,
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prev_group: Optional[int],
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delta_ids: Optional[StateMap[str]],
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current_state_ids: StateMap[str],
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current_state_ids: Optional[StateMap[str]],
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) -> int:
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"""Store a new set of state, returning a newly assigned state group.
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At least one of `current_state_ids` and `prev_group` must be provided. Whenever
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`prev_group` is not None, `delta_ids` must also not be None.
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Args:
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event_id: The event ID for which the state was calculated
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room_id
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prev_group: A previous state group for the room, optional.
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prev_group: A previous state group for the room.
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delta_ids: The delta between state at `prev_group` and
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`current_state_ids`, if `prev_group` was given. Same format as
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`current_state_ids`.
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@ -418,10 +421,41 @@ class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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The state group ID
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"""
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def _store_state_group_txn(txn: LoggingTransaction) -> int:
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if current_state_ids is None:
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# AFAIK, this can never happen
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raise Exception("current_state_ids cannot be None")
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if prev_group is None and current_state_ids is None:
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raise Exception("current_state_ids and prev_group can't both be None")
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if prev_group is not None and delta_ids is None:
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raise Exception("delta_ids is None when prev_group is not None")
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def insert_delta_group_txn(
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txn: LoggingTransaction, prev_group: int, delta_ids: StateMap[str]
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) -> Optional[int]:
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"""Try and persist the new group as a delta.
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Requires that we have the state as a delta from a previous state group.
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Returns:
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The state group if successfully created, or None if the state
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needs to be persisted as a full state.
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"""
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is_in_db = self.db_pool.simple_select_one_onecol_txn(
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txn,
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table="state_groups",
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keyvalues={"id": prev_group},
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retcol="id",
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allow_none=True,
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)
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if not is_in_db:
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raise Exception(
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"Trying to persist state with unpersisted prev_group: %r"
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% (prev_group,)
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)
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# if the chain of state group deltas is going too long, we fall back to
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# persisting a complete state group.
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potential_hops = self._count_state_group_hops_txn(txn, prev_group)
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if potential_hops >= MAX_STATE_DELTA_HOPS:
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return None
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state_group = self._state_group_seq_gen.get_next_id_txn(txn)
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@ -431,51 +465,45 @@ class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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values={"id": state_group, "room_id": room_id, "event_id": event_id},
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)
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# We persist as a delta if we can, while also ensuring the chain
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# of deltas isn't tooo long, as otherwise read performance degrades.
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if prev_group:
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is_in_db = self.db_pool.simple_select_one_onecol_txn(
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txn,
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table="state_groups",
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keyvalues={"id": prev_group},
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retcol="id",
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allow_none=True,
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)
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if not is_in_db:
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raise Exception(
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"Trying to persist state with unpersisted prev_group: %r"
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% (prev_group,)
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)
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self.db_pool.simple_insert_txn(
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txn,
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table="state_group_edges",
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values={"state_group": state_group, "prev_state_group": prev_group},
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)
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potential_hops = self._count_state_group_hops_txn(txn, prev_group)
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if prev_group and potential_hops < MAX_STATE_DELTA_HOPS:
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assert delta_ids is not None
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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keys=("state_group", "room_id", "type", "state_key", "event_id"),
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values=[
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(state_group, room_id, key[0], key[1], state_id)
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for key, state_id in delta_ids.items()
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],
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)
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self.db_pool.simple_insert_txn(
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txn,
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table="state_group_edges",
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values={"state_group": state_group, "prev_state_group": prev_group},
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)
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return state_group
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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keys=("state_group", "room_id", "type", "state_key", "event_id"),
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values=[
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(state_group, room_id, key[0], key[1], state_id)
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for key, state_id in delta_ids.items()
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],
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)
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else:
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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keys=("state_group", "room_id", "type", "state_key", "event_id"),
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values=[
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(state_group, room_id, key[0], key[1], state_id)
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for key, state_id in current_state_ids.items()
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],
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)
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def insert_full_state_txn(
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txn: LoggingTransaction, current_state_ids: StateMap[str]
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) -> int:
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"""Persist the full state, returning the new state group."""
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state_group = self._state_group_seq_gen.get_next_id_txn(txn)
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self.db_pool.simple_insert_txn(
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txn,
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table="state_groups",
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values={"id": state_group, "room_id": room_id, "event_id": event_id},
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)
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self.db_pool.simple_insert_many_txn(
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txn,
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table="state_groups_state",
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keys=("state_group", "room_id", "type", "state_key", "event_id"),
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values=[
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(state_group, room_id, key[0], key[1], state_id)
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for key, state_id in current_state_ids.items()
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],
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)
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# Prefill the state group caches with this group.
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# It's fine to use the sequence like this as the state group map
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@ -491,7 +519,7 @@ class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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self._state_group_members_cache.update,
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self._state_group_members_cache.sequence,
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key=state_group,
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value=dict(current_member_state_ids),
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value=current_member_state_ids,
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)
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current_non_member_state_ids = {
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@ -503,13 +531,35 @@ class StateGroupDataStore(StateBackgroundUpdateStore, SQLBaseStore):
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self._state_group_cache.update,
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self._state_group_cache.sequence,
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key=state_group,
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value=dict(current_non_member_state_ids),
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value=current_non_member_state_ids,
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)
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return state_group
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if prev_group is not None:
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state_group = await self.db_pool.runInteraction(
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"store_state_group.insert_delta_group",
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insert_delta_group_txn,
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prev_group,
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delta_ids,
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)
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if state_group is not None:
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return state_group
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# We're going to persist the state as a complete group rather than
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# a delta, so first we need to ensure we have loaded the state map
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# from the database.
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if current_state_ids is None:
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assert prev_group is not None
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assert delta_ids is not None
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groups = await self._get_state_for_groups([prev_group])
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current_state_ids = dict(groups[prev_group])
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current_state_ids.update(delta_ids)
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return await self.db_pool.runInteraction(
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"store_state_group", _store_state_group_txn
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"store_state_group.insert_full_state",
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insert_full_state_txn,
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current_state_ids,
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)
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async def purge_unreferenced_state_groups(
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@ -709,7 +709,7 @@ class RoomsCreateTestCase(RoomBase):
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self.assertEqual(200, channel.code, channel.result)
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self.assertTrue("room_id" in channel.json_body)
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assert channel.resource_usage is not None
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self.assertEqual(32, channel.resource_usage.db_txn_count)
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self.assertEqual(36, channel.resource_usage.db_txn_count)
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def test_post_room_initial_state(self) -> None:
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# POST with initial_state config key, expect new room id
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@ -722,7 +722,7 @@ class RoomsCreateTestCase(RoomBase):
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self.assertEqual(200, channel.code, channel.result)
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self.assertTrue("room_id" in channel.json_body)
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assert channel.resource_usage is not None
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self.assertEqual(35, channel.resource_usage.db_txn_count)
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self.assertEqual(40, channel.resource_usage.db_txn_count)
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def test_post_room_visibility_key(self) -> None:
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# POST with visibility config key, expect new room id
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@ -99,6 +99,10 @@ class _DummyStore:
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state_group = self._next_group
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self._next_group += 1
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if current_state_ids is None:
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current_state_ids = dict(self._group_to_state[prev_group])
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current_state_ids.update(delta_ids)
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self._group_to_state[state_group] = dict(current_state_ids)
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return state_group
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