diff options
Diffstat (limited to 'synapse/events')
| -rw-r--r-- | synapse/events/snapshot.py | 91 |
1 files changed, 65 insertions, 26 deletions
diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py index a269de5482..5f07f6fe4b 100644 --- a/synapse/events/snapshot.py +++ b/synapse/events/snapshot.py @@ -12,6 +12,8 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. +from typing import Dict, Optional, Tuple, Union + from six import iteritems import attr @@ -19,45 +21,82 @@ from frozendict import frozendict from twisted.internet import defer +from synapse.appservice import ApplicationService from synapse.logging.context import make_deferred_yieldable, run_in_background @attr.s(slots=True) class EventContext: """ + Holds information relevant to persisting an event + Attributes: - state_group (int|None): state group id, if the state has been stored - as a state group. This is usually only None if e.g. the event is - an outlier. - rejected (bool|str): A rejection reason if the event was rejected, else - False - - prev_group (int): Previously persisted state group. ``None`` for an - outlier. - delta_ids (dict[(str, str), str]): Delta from ``prev_group``. - (type, state_key) -> event_id. ``None`` for an outlier. - - app_service: FIXME - - _current_state_ids (dict[(str, str), str]|None): - The current state map including the current event. None if outlier - or we haven't fetched the state from DB yet. + rejected: A rejection reason if the event was rejected, else False + + state_group: The ID of the state group for this event. Note that state events + are persisted with a state group which includes the new event, so this is + effectively the state *after* the event in question. + + For a *rejected* state event, where the state of the rejected event is + ignored, this state_group should never make it into the + event_to_state_groups table. Indeed, inspecting this value for a rejected + state event is almost certainly incorrect. + + For an outlier, where we don't have the state at the event, this will be + None. + + prev_group: If it is known, ``state_group``'s prev_group. Note that this being + None does not necessarily mean that ``state_group`` does not have + a prev_group! + + If ``state_group`` is None (ie, the event is an outlier), ``prev_group`` + will always also be ``None``. + + Note that this *not* (necessarily) the state group associated with + ``_prev_state_ids``. + + delta_ids: If ``prev_group`` is not None, the state delta between ``prev_group`` + and ``state_group``. + + app_service: If this event is being sent by a (local) application service, that + app service. + + _current_state_ids: The room state map, including this event - ie, the state + in ``state_group``. + (type, state_key) -> event_id - _prev_state_ids (dict[(str, str), str]|None): - The current state map excluding the current event. None if outlier - or we haven't fetched the state from DB yet. + FIXME: what is this for an outlier? it seems ill-defined. It seems like + it could be either {}, or the state we were given by the remote + server, depending on $THINGS + + Note that this is a private attribute: it should be accessed via + ``get_current_state_ids``. _AsyncEventContext impl calculates this + on-demand: it will be None until that happens. + + _prev_state_ids: The room state map, excluding this event. For a non-state + event, this will be the same as _current_state_events. + + Note that it is a completely different thing to prev_group! + (type, state_key) -> event_id + + FIXME: again, what is this for an outlier? + + As with _current_state_ids, this is a private attribute. It should be + accessed via get_prev_state_ids. """ - state_group = attr.ib(default=None) - rejected = attr.ib(default=False) - prev_group = attr.ib(default=None) - delta_ids = attr.ib(default=None) - app_service = attr.ib(default=None) + rejected = attr.ib(default=False, type=Union[bool, str]) + state_group = attr.ib(default=None, type=Optional[int]) + prev_group = attr.ib(default=None, type=Optional[int]) + delta_ids = attr.ib(default=None, type=Optional[Dict[Tuple[str, str], str]]) + app_service = attr.ib(default=None, type=Optional[ApplicationService]) - _prev_state_ids = attr.ib(default=None) - _current_state_ids = attr.ib(default=None) + _current_state_ids = attr.ib( + default=None, type=Optional[Dict[Tuple[str, str], str]] + ) + _prev_state_ids = attr.ib(default=None, type=Optional[Dict[Tuple[str, str], str]]) @staticmethod def with_state( |