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https://git.anonymousland.org/anonymousland/synapse-product.git
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397 lines
13 KiB
Python
397 lines
13 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 import unwrapFirstError
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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, 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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event_and_groups = yield defer.gatherResults(
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[
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self._get_state_group_for_event(
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room_id, event_id,
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).addCallback(lambda group, event_id: (event_id, group), event_id)
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for event_id in event_ids
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError)
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groups = set(group for _, group in event_and_groups if group)
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group_to_state = yield defer.gatherResults(
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[
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self._get_state_for_group(
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group,
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).addCallback(lambda state_dict, group: (group, state_dict), group)
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for group in groups
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError)
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defer.returnValue({
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group: state_map.values()
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for group, state_map in group_to_state
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})
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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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@cached(num_args=2, lru=True, max_entries=10000)
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def _get_state_groups_from_group(self, group, types):
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def f(txn):
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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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sql = (
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"SELECT event_id FROM state_groups_state WHERE"
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" state_group = ? %s"
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) % (where_clause,)
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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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return group, [
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r[0]
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for r in txn.fetchall()
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]
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return self.runInteraction(
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"_get_state_groups_from_group",
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f,
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)
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@cached(num_args=3, lru=True, max_entries=20000)
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def _get_state_for_event_id(self, room_id, event_id, types):
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def f(txn):
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type_and_state_sql = " OR ".join([
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"(type = ? AND state_key = ?)"
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if typ[1] is not None
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else "type = ?"
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for typ in types
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])
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sql = (
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"SELECT e.event_id, sg.state_group, sg.event_id"
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" FROM state_groups_state as sg"
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" INNER JOIN event_to_state_groups as e"
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" ON e.state_group = sg.state_group"
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" WHERE e.event_id = ? AND (%s)"
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) % (type_and_state_sql,)
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args = [event_id]
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for typ, state_key in types:
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args.extend(
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[typ, state_key] if state_key is not None else [typ]
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)
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txn.execute(sql, args)
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return event_id, [
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r[0]
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for r in txn.fetchall()
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]
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return self.runInteraction(
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"_get_state_for_event_id",
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f,
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)
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@defer.inlineCallbacks
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def get_state_for_events(self, room_id, 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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room_id (str)
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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_and_groups = yield defer.gatherResults(
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[
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self._get_state_group_for_event(
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room_id, event_id,
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).addCallback(lambda group, event_id: (event_id, group), event_id)
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for event_id in event_ids
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError)
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groups = set(group for _, group in event_and_groups)
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res = yield defer.gatherResults(
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[
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self._get_state_for_group(
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group, types
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).addCallback(lambda state_dict, group: (group, state_dict), group)
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for group in groups
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],
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consumeErrors=True,
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).addErrback(unwrapFirstError)
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group_to_state = dict(res)
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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_and_groups
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}
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defer.returnValue([
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event_to_state[event]
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for event in event_ids
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])
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@cached(num_args=2, lru=True, max_entries=100000)
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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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@defer.inlineCallbacks
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def _get_state_for_group(self, group, types=None):
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is_all, state_dict = self._state_group_cache.get(group)
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type_to_key = {}
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missing_types = set()
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if types is not None:
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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:
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missing_types.add((typ, state_key))
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if is_all and types is None:
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defer.returnValue(state_dict)
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if is_all or (types is not None and not missing_types):
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sentinel = object()
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def include(typ, state_key):
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valid_state_keys = type_to_key.get(typ, sentinel)
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if valid_state_keys is sentinel:
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return False
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if valid_state_keys is None:
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return True
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if state_key in valid_state_keys:
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return True
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return False
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defer.returnValue({
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k: v
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for k, v in state_dict.items()
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if v and include(k[0], k[1])
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})
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# Okay, so we have some missing_types, lets fetch them.
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cache_seq_num = self._state_group_cache.sequence
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_, state_ids = yield self._get_state_groups_from_group(
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group,
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frozenset(missing_types) if types else None
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)
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state_events = yield self._get_events(state_ids, get_prev_content=False)
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state_dict = {
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key: None
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for key in missing_types
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}
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state_dict.update({
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(e.type, e.state_key): e
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for e in state_events
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})
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# Update the cache
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self._state_group_cache.update(
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cache_seq_num,
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key=group,
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value=state_dict,
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full=(types is None),
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)
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defer.returnValue({
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key: value
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for key, value in state_dict.items()
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if value
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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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