mirror of
https://git.anonymousland.org/anonymousland/synapse.git
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635 lines
23 KiB
Python
635 lines
23 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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
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from synapse.util.caches.descriptors import cached, cachedList
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from synapse.util.caches import intern_string
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from synapse.storage.engines import PostgresEngine
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from twisted.internet import defer
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import logging
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logger = logging.getLogger(__name__)
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MAX_STATE_DELTA_HOPS = 100
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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_ids(self, room_id, event_ids):
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if not event_ids:
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defer.returnValue({})
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event_to_groups = yield self._get_state_group_for_events(
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event_ids,
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)
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groups = set(event_to_groups.values())
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group_to_state = yield self._get_state_for_groups(groups)
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defer.returnValue(group_to_state)
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@defer.inlineCallbacks
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def get_state_groups(self, room_id, 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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if not event_ids:
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defer.returnValue({})
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group_to_ids = yield self.get_state_groups_ids(room_id, event_ids)
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state_event_map = yield self.get_events(
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[
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ev_id for group_ids in group_to_ids.values()
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for ev_id in group_ids.values()
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],
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get_prev_content=False
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)
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defer.returnValue({
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group: [
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state_event_map[v] for v in event_id_map.values() if v in state_event_map
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]
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for group, event_id_map in group_to_ids.items()
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})
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def _have_persisted_state_group_txn(self, txn, state_group):
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txn.execute(
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"SELECT count(*) FROM state_groups WHERE id = ?",
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(state_group,)
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)
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row = txn.fetchone()
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return row and row[0]
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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 event.internal_metadata.is_outlier():
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continue
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if context.current_state_ids is None:
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continue
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state_groups[event.event_id] = context.state_group
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if self._have_persisted_state_group_txn(txn, context.state_group):
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continue
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state_event_ids = dict(context.current_state_ids)
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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": context.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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if context.prev_group:
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potential_hops = self._count_state_group_hops_txn(
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txn, context.prev_group
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)
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if potential_hops < MAX_STATE_DELTA_HOPS:
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self._simple_insert_txn(
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txn,
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table="state_group_edges",
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values={
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"state_group": context.state_group,
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"prev_state_group": context.prev_group,
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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": context.state_group,
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"room_id": event.room_id,
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"type": key[0],
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"state_key": key[1],
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"event_id": state_id,
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}
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for key, state_id in context.delta_ids.items()
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],
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)
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else:
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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": context.state_group,
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"room_id": event.room_id,
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"type": key[0],
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"state_key": key[1],
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"event_id": state_id,
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}
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for key, state_id in context.current_state_ids.items()
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],
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)
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else:
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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": context.state_group,
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"room_id": event.room_id,
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"type": key[0],
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"state_key": key[1],
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"event_id": state_id,
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}
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for key, state_id in state_event_ids.items()
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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="event_to_state_groups",
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values=[
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{
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"state_group": state_group_id,
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"event_id": event_id,
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}
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for event_id, state_group_id in state_groups.items()
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],
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)
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def _count_state_group_hops_txn(self, txn, state_group):
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if isinstance(self.database_engine, PostgresEngine):
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sql = ("""
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WITH RECURSIVE state(state_group) AS (
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VALUES(?::bigint)
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UNION ALL
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SELECT prev_state_group FROM state_group_edges e, state s
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WHERE s.state_group = e.state_group
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)
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SELECT count(*) FROM state;
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""")
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txn.execute(sql, (state_group,))
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row = txn.fetchone()
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if row and row[0]:
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return row[0]
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else:
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return 0
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else:
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next_group = state_group
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count = 0
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while next_group:
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next_group = self._simple_select_one_onecol_txn(
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txn,
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table="state_group_edges",
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keyvalues={"state_group": next_group},
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retcol="prev_state_group",
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allow_none=True,
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)
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if next_group:
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count += 1
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return count
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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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@defer.inlineCallbacks
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def get_current_state_for_key(self, room_id, event_type, state_key):
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event_ids = yield self._get_current_state_for_key(room_id, event_type, state_key)
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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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@cached(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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return self.runInteraction("get_current_state_for_key", f)
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@cached(num_args=2, max_entries=1000)
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def _get_state_group_from_group(self, group, types):
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raise NotImplementedError()
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@cachedList(cached_method_name="_get_state_group_from_group",
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list_name="groups", num_args=2, inlineCallbacks=True)
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def _get_state_groups_from_groups(self, groups, types):
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"""Returns dictionary state_group -> (dict of (type, state_key) -> event id)
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"""
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def f(txn, groups):
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if types is not None:
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where_clause = "AND (%s)" % (
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" OR ".join(["(type = ? AND state_key = ?)"] * len(types)),
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)
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else:
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where_clause = ""
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results = {group: {} for group in groups}
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if isinstance(self.database_engine, PostgresEngine):
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sql = ("""
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WITH RECURSIVE state(state_group) AS (
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VALUES(?::bigint)
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UNION ALL
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SELECT prev_state_group FROM state_group_edges e, state s
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WHERE s.state_group = e.state_group
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)
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SELECT type, state_key, event_id FROM state_groups_state
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WHERE ROW(type, state_key, state_group) IN (
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SELECT type, state_key, max(state_group) FROM state
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INNER JOIN state_groups_state USING (state_group)
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GROUP BY type, state_key
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)
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%s;
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""") % (where_clause,)
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for group in groups:
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args = [group]
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if types is not None:
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args.extend([i for typ in types for i in typ])
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txn.execute(sql, args)
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rows = self.cursor_to_dict(txn)
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for row in rows:
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key = (row["type"], row["state_key"])
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results[group][key] = row["event_id"]
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else:
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for group in groups:
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group_tree = [group]
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next_group = group
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while next_group:
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next_group = self._simple_select_one_onecol_txn(
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txn,
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table="state_group_edges",
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keyvalues={"state_group": next_group},
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retcol="prev_state_group",
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allow_none=True,
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)
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if next_group:
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group_tree.append(next_group)
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sql = ("""
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SELECT type, state_key, event_id FROM state_groups_state
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INNER JOIN (
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SELECT type, state_key, max(state_group) as state_group
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FROM state_groups_state
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WHERE state_group IN (%s) %s
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GROUP BY type, state_key
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) USING (type, state_key, state_group);
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""") % (",".join("?" for _ in group_tree), where_clause,)
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args = list(group_tree)
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if types is not None:
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args.extend([i for typ in types for i in typ])
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txn.execute(sql, args)
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rows = self.cursor_to_dict(txn)
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for row in rows:
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key = (row["type"], row["state_key"])
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results[group][key] = row["event_id"]
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return results
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results = {}
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chunks = [groups[i:i + 100] for i in xrange(0, len(groups), 100)]
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for chunk in chunks:
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res = yield self.runInteraction(
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"_get_state_groups_from_groups",
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f, chunk
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)
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results.update(res)
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defer.returnValue(results)
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@defer.inlineCallbacks
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def get_state_for_events(self, event_ids, types):
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"""Given a list of event_ids and type tuples, return a list of state
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dicts for each event. The state dicts will only have the type/state_keys
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that are in the `types` list.
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Args:
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event_ids (list)
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types (list): List of (type, state_key) tuples which are used to
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filter the state fetched. `state_key` may be None, which matches
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any `state_key`
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Returns:
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deferred: A list of dicts corresponding to the event_ids given.
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The dicts are mappings from (type, state_key) -> state_events
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"""
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event_to_groups = yield self._get_state_group_for_events(
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event_ids,
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)
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groups = set(event_to_groups.values())
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group_to_state = yield self._get_state_for_groups(groups, types)
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state_event_map = yield self.get_events(
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[ev_id for sd in group_to_state.values() for ev_id in sd.values()],
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get_prev_content=False
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)
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event_to_state = {
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event_id: {
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k: state_event_map[v]
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for k, v in group_to_state[group].items()
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if v in state_event_map
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}
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for event_id, group in event_to_groups.items()
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}
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defer.returnValue({event: event_to_state[event] for event in event_ids})
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@defer.inlineCallbacks
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def get_state_ids_for_events(self, event_ids, types):
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event_to_groups = yield self._get_state_group_for_events(
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event_ids,
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)
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groups = set(event_to_groups.values())
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group_to_state = yield self._get_state_for_groups(groups, types)
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event_to_state = {
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event_id: group_to_state[group]
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for event_id, group in event_to_groups.items()
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}
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defer.returnValue({event: event_to_state[event] for event in event_ids})
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@defer.inlineCallbacks
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def get_state_for_event(self, event_id, types=None):
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"""
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Get the state dict corresponding to a particular event
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Args:
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event_id(str): event whose state should be returned
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types(list[(str, str)]|None): List of (type, state_key) tuples
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which are used to filter the state fetched. May be None, which
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matches any key
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Returns:
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A deferred dict from (type, state_key) -> state_event
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"""
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state_map = yield self.get_state_for_events([event_id], types)
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defer.returnValue(state_map[event_id])
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@defer.inlineCallbacks
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def get_state_ids_for_event(self, event_id, types=None):
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"""
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Get the state dict corresponding to a particular event
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Args:
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event_id(str): event whose state should be returned
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types(list[(str, str)]|None): List of (type, state_key) tuples
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which are used to filter the state fetched. May be None, which
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matches any key
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Returns:
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A deferred dict from (type, state_key) -> state_event
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"""
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state_map = yield self.get_state_ids_for_events([event_id], types)
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defer.returnValue(state_map[event_id])
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@cached(num_args=2, max_entries=10000)
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def _get_state_group_for_event(self, room_id, event_id):
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return self._simple_select_one_onecol(
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table="event_to_state_groups",
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keyvalues={
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"event_id": event_id,
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},
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retcol="state_group",
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allow_none=True,
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desc="_get_state_group_for_event",
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)
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@cachedList(cached_method_name="_get_state_group_for_event",
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list_name="event_ids", num_args=1, inlineCallbacks=True)
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def _get_state_group_for_events(self, event_ids):
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"""Returns mapping event_id -> state_group
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"""
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rows = yield self._simple_select_many_batch(
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table="event_to_state_groups",
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column="event_id",
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iterable=event_ids,
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keyvalues={},
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retcols=("event_id", "state_group",),
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desc="_get_state_group_for_events",
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)
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defer.returnValue({row["event_id"]: row["state_group"] for row in rows})
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def _get_some_state_from_cache(self, group, types):
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"""Checks if group is in cache. See `_get_state_for_groups`
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Returns 3-tuple (`state_dict`, `missing_types`, `got_all`).
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`missing_types` is the list of types that aren't in the cache for that
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group. `got_all` is a bool indicating if we successfully retrieved all
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requests state from the cache, if False we need to query the DB for the
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missing state.
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Args:
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group: The state group to lookup
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types (list): List of 2-tuples of the form (`type`, `state_key`),
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where a `state_key` of `None` matches all state_keys for the
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`type`.
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"""
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is_all, state_dict_ids = self._state_group_cache.get(group)
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type_to_key = {}
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missing_types = set()
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for typ, state_key in types:
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if state_key is None:
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type_to_key[typ] = None
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missing_types.add((typ, state_key))
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else:
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if type_to_key.get(typ, object()) is not None:
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type_to_key.setdefault(typ, set()).add(state_key)
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|
|
|
if (typ, state_key) not in state_dict_ids:
|
|
missing_types.add((typ, state_key))
|
|
|
|
sentinel = object()
|
|
|
|
def include(typ, state_key):
|
|
valid_state_keys = type_to_key.get(typ, sentinel)
|
|
if valid_state_keys is sentinel:
|
|
return False
|
|
if valid_state_keys is None:
|
|
return True
|
|
if state_key in valid_state_keys:
|
|
return True
|
|
return False
|
|
|
|
got_all = not (missing_types or types is None)
|
|
|
|
return {
|
|
k: v for k, v in state_dict_ids.items()
|
|
if include(k[0], k[1])
|
|
}, missing_types, got_all
|
|
|
|
def _get_all_state_from_cache(self, group):
|
|
"""Checks if group is in cache. See `_get_state_for_groups`
|
|
|
|
Returns 2-tuple (`state_dict`, `got_all`). `got_all` is a bool
|
|
indicating if we successfully retrieved all requests state from the
|
|
cache, if False we need to query the DB for the missing state.
|
|
|
|
Args:
|
|
group: The state group to lookup
|
|
"""
|
|
is_all, state_dict_ids = self._state_group_cache.get(group)
|
|
|
|
return state_dict_ids, is_all
|
|
|
|
@defer.inlineCallbacks
|
|
def _get_state_for_groups(self, groups, types=None):
|
|
"""Given list of groups returns dict of group -> list of state events
|
|
with matching types. `types` is a list of `(type, state_key)`, where
|
|
a `state_key` of None matches all state_keys. If `types` is None then
|
|
all events are returned.
|
|
"""
|
|
if types:
|
|
types = frozenset(types)
|
|
results = {}
|
|
missing_groups = []
|
|
if types is not None:
|
|
for group in set(groups):
|
|
state_dict_ids, missing_types, got_all = self._get_some_state_from_cache(
|
|
group, types
|
|
)
|
|
results[group] = state_dict_ids
|
|
|
|
if not got_all:
|
|
missing_groups.append(group)
|
|
else:
|
|
for group in set(groups):
|
|
state_dict_ids, got_all = self._get_all_state_from_cache(
|
|
group
|
|
)
|
|
|
|
results[group] = state_dict_ids
|
|
|
|
if not got_all:
|
|
missing_groups.append(group)
|
|
|
|
if missing_groups:
|
|
# Okay, so we have some missing_types, lets fetch them.
|
|
cache_seq_num = self._state_group_cache.sequence
|
|
|
|
group_to_state_dict = yield self._get_state_groups_from_groups(
|
|
missing_groups, types
|
|
)
|
|
|
|
# Now we want to update the cache with all the things we fetched
|
|
# from the database.
|
|
for group, group_state_dict in group_to_state_dict.items():
|
|
if types:
|
|
# We delibrately put key -> None mappings into the cache to
|
|
# cache absence of the key, on the assumption that if we've
|
|
# explicitly asked for some types then we will probably ask
|
|
# for them again.
|
|
state_dict = {
|
|
(intern_string(etype), intern_string(state_key)): None
|
|
for (etype, state_key) in types
|
|
}
|
|
state_dict.update(results[group])
|
|
results[group] = state_dict
|
|
else:
|
|
state_dict = results[group]
|
|
|
|
state_dict.update(group_state_dict)
|
|
|
|
self._state_group_cache.update(
|
|
cache_seq_num,
|
|
key=group,
|
|
value=state_dict,
|
|
full=(types is None),
|
|
)
|
|
|
|
# Remove all the entries with None values. The None values were just
|
|
# used for bookkeeping in the cache.
|
|
for group, state_dict in results.items():
|
|
results[group] = {
|
|
key: event_id
|
|
for key, event_id in state_dict.items()
|
|
if event_id
|
|
}
|
|
|
|
defer.returnValue(results)
|
|
|
|
def get_next_state_group(self):
|
|
return self._state_groups_id_gen.get_next()
|