270 lines
8.7 KiB
Python
270 lines
8.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from ._base import SQLBaseStore, cached, cachedInlineCallbacks
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from twisted.internet import defer
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from synapse.util.stringutils import random_string
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import logging
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logger = logging.getLogger(__name__)
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class StateStore(SQLBaseStore):
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""" Keeps track of the state at a given event.
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This is done by the concept of `state groups`. Every event is a assigned
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a state group (identified by an arbitrary string), which references a
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collection of state events. The current state of an event is then the
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collection of state events referenced by the event's state group.
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Hence, every change in the current state causes a new state group to be
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generated. However, if no change happens (e.g., if we get a message event
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with only one parent it inherits the state group from its parent.)
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There are three tables:
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* `state_groups`: Stores group name, first event with in the group and
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room id.
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* `event_to_state_groups`: Maps events to state groups.
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* `state_groups_state`: Maps state group to state events.
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"""
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@defer.inlineCallbacks
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def get_state_groups(self, event_ids):
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""" Get the state groups for the given list of event_ids
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The return value is a dict mapping group names to lists of events.
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"""
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def f(txn):
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groups = set()
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for event_id in event_ids:
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group = self._simple_select_one_onecol_txn(
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txn,
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table="event_to_state_groups",
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keyvalues={"event_id": event_id},
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retcol="state_group",
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allow_none=True,
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)
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if group:
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groups.add(group)
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res = {}
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for group in groups:
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state_ids = self._simple_select_onecol_txn(
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txn,
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table="state_groups_state",
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keyvalues={"state_group": group},
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retcol="event_id",
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)
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res[group] = state_ids
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return res
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states = yield self.runInteraction(
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"get_state_groups",
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f,
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)
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state_list = yield defer.gatherResults(
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[
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self._fetch_events_for_group(group, vals)
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for group, vals in states.items()
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],
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consumeErrors=True,
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)
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defer.returnValue(dict(state_list))
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@cached(num_args=1)
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def _fetch_events_for_group(self, key, events):
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return self._get_events(
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events, get_prev_content=False
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).addCallback(
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lambda evs: (key, evs)
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)
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def _store_state_groups_txn(self, txn, event, context):
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return self._store_mult_state_groups_txn(txn, [(event, context)])
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def _store_mult_state_groups_txn(self, txn, events_and_contexts):
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state_groups = {}
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for event, context in events_and_contexts:
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if context.current_state is None:
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continue
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if context.state_group is not None:
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state_groups[event.event_id] = context.state_group
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continue
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state_events = dict(context.current_state)
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if event.is_state():
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state_events[(event.type, event.state_key)] = event
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state_group = self._state_groups_id_gen.get_next_txn(txn)
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self._simple_insert_txn(
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txn,
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table="state_groups",
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values={
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"id": state_group,
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"room_id": event.room_id,
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"event_id": event.event_id,
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},
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)
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self._simple_insert_many_txn(
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txn,
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table="state_groups_state",
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values=[
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{
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"state_group": state_group,
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"room_id": state.room_id,
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"type": state.type,
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"state_key": state.state_key,
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"event_id": state.event_id,
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}
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for state in state_events.values()
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],
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)
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state_groups[event.event_id] = state_group
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self._simple_insert_many_txn(
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txn,
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table="event_to_state_groups",
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values=[
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{
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"state_group": state_groups[event.event_id],
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"event_id": event.event_id,
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}
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for event, context in events_and_contexts
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if context.current_state is not None
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],
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)
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@defer.inlineCallbacks
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def get_current_state(self, room_id, event_type=None, state_key=""):
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if event_type and state_key is not None:
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result = yield self.get_current_state_for_key(
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room_id, event_type, state_key
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)
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defer.returnValue(result)
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def f(txn):
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sql = (
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"SELECT event_id FROM current_state_events"
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" WHERE room_id = ? "
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)
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if event_type and state_key is not None:
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sql += " AND type = ? AND state_key = ? "
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args = (room_id, event_type, state_key)
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elif event_type:
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sql += " AND type = ?"
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args = (room_id, event_type)
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else:
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args = (room_id, )
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txn.execute(sql, args)
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results = txn.fetchall()
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return [r[0] for r in results]
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event_ids = yield self.runInteraction("get_current_state", f)
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events = yield self._get_events(event_ids, get_prev_content=False)
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defer.returnValue(events)
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@cachedInlineCallbacks(num_args=3)
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def get_current_state_for_key(self, room_id, event_type, state_key):
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def f(txn):
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sql = (
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"SELECT event_id FROM current_state_events"
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" WHERE room_id = ? AND type = ? AND state_key = ?"
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)
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args = (room_id, event_type, state_key)
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txn.execute(sql, args)
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results = txn.fetchall()
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return [r[0] for r in results]
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event_ids = yield self.runInteraction("get_current_state_for_key", f)
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events = yield self._get_events(event_ids, get_prev_content=False)
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defer.returnValue(events)
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@defer.inlineCallbacks
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def get_state_for_events(self, room_id, event_ids):
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def f(txn):
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groups = set()
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event_to_group = {}
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for event_id in event_ids:
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# TODO: Remove this loop.
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group = self._simple_select_one_onecol_txn(
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txn,
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table="event_to_state_groups",
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keyvalues={"event_id": event_id},
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retcol="state_group",
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allow_none=True,
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)
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if group:
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event_to_group[event_id] = group
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groups.add(group)
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group_to_state_ids = {}
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for group in groups:
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state_ids = self._simple_select_onecol_txn(
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txn,
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table="state_groups_state",
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keyvalues={"state_group": group},
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retcol="event_id",
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)
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group_to_state_ids[group] = state_ids
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return event_to_group, group_to_state_ids
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res = yield self.runInteraction(
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"annotate_events_with_state_groups",
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f,
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)
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event_to_group, group_to_state_ids = res
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state_list = yield defer.gatherResults(
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[
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self._fetch_events_for_group(group, vals)
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for group, vals in group_to_state_ids.items()
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],
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consumeErrors=True,
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)
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state_dict = {
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group: {
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(ev.type, ev.state_key): ev
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for ev in state
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}
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for group, state in state_list
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}
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defer.returnValue([
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state_dict.get(event_to_group.get(event, None), None)
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for event in event_ids
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])
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def _make_group_id(clock):
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return str(int(clock.time_msec())) + random_string(5)
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