mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-27 07:29:26 -05:00
125 lines
4.0 KiB
Python
125 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014, 2015 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# 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 ._base import SQLBaseStore
|
|
|
|
import logging
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class StateStore(SQLBaseStore):
|
|
""" Keeps track of the state at a given event.
|
|
|
|
This is done by the concept of `state groups`. Every event is a assigned
|
|
a state group (identified by an arbitrary string), which references a
|
|
collection of state events. The current state of an event is then the
|
|
collection of state events referenced by the event's state group.
|
|
|
|
Hence, every change in the current state causes a new state group to be
|
|
generated. However, if no change happens (e.g., if we get a message event
|
|
with only one parent it inherits the state group from its parent.)
|
|
|
|
There are three tables:
|
|
* `state_groups`: Stores group name, first event with in the group and
|
|
room id.
|
|
* `event_to_state_groups`: Maps events to state groups.
|
|
* `state_groups_state`: Maps state group to state events.
|
|
"""
|
|
|
|
def get_state_groups(self, event_ids):
|
|
""" Get the state groups for the given list of event_ids
|
|
|
|
The return value is a dict mapping group names to lists of events.
|
|
"""
|
|
|
|
def f(txn):
|
|
groups = set()
|
|
for event_id in event_ids:
|
|
group = self._simple_select_one_onecol_txn(
|
|
txn,
|
|
table="event_to_state_groups",
|
|
keyvalues={"event_id": event_id},
|
|
retcol="state_group",
|
|
allow_none=True,
|
|
)
|
|
if group:
|
|
groups.add(group)
|
|
|
|
res = {}
|
|
for group in groups:
|
|
state_ids = self._simple_select_onecol_txn(
|
|
txn,
|
|
table="state_groups_state",
|
|
keyvalues={"state_group": group},
|
|
retcol="event_id",
|
|
)
|
|
|
|
state = self._get_events_txn(txn, state_ids)
|
|
|
|
res[group] = state
|
|
|
|
return res
|
|
|
|
return self.runInteraction(
|
|
"get_state_groups",
|
|
f,
|
|
)
|
|
|
|
def _store_state_groups_txn(self, txn, event, context):
|
|
if context.current_state is None:
|
|
return
|
|
|
|
state_events = context.current_state
|
|
|
|
if event.is_state():
|
|
state_events[(event.type, event.state_key)] = event
|
|
|
|
state_group = context.state_group
|
|
if not state_group:
|
|
state_group = self._simple_insert_txn(
|
|
txn,
|
|
table="state_groups",
|
|
values={
|
|
"room_id": event.room_id,
|
|
"event_id": event.event_id,
|
|
},
|
|
or_ignore=True,
|
|
)
|
|
|
|
for state in state_events.values():
|
|
self._simple_insert_txn(
|
|
txn,
|
|
table="state_groups_state",
|
|
values={
|
|
"state_group": state_group,
|
|
"room_id": state.room_id,
|
|
"type": state.type,
|
|
"state_key": state.state_key,
|
|
"event_id": state.event_id,
|
|
},
|
|
or_ignore=True,
|
|
)
|
|
|
|
self._simple_insert_txn(
|
|
txn,
|
|
table="event_to_state_groups",
|
|
values={
|
|
"state_group": state_group,
|
|
"event_id": event.event_id,
|
|
},
|
|
or_replace=True,
|
|
)
|