438 lines
16 KiB
Python
438 lines
16 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 (
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cached, cachedInlineCallbacks, cachedList
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)
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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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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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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({
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group: state_map.values()
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for group, state_map in group_to_state.items()
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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()
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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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def _get_state_groups_from_groups(self, groups, types):
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"""Returns dictionary state_group -> state event ids
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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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sql = (
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"SELECT state_group, event_id FROM state_groups_state WHERE"
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" state_group IN (%s) %s" % (
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",".join("?" for _ in groups),
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where_clause,
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)
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)
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args = list(groups)
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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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results = {}
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for row in rows:
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results.setdefault(row["state_group"], []).append(row["event_id"])
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return 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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return 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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@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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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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:param str event_id: event whose state should be returned
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:param list[(str, str)]|None types: 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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:return: 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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@cached(num_args=2, lru=True, 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(cache=_get_state_group_for_event.cache, list_name="event_ids",
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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 = 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:
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missing_types.add((typ, state_key))
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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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got_all = not (missing_types or types is None)
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return {
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k: v for k, v in state_dict.items()
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if include(k[0], k[1])
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}, missing_types, got_all
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def _get_all_state_from_cache(self, group):
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"""Checks if group is in cache. See `_get_state_for_groups`
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Returns 2-tuple (`state_dict`, `got_all`). `got_all` is a bool
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indicating if we successfully retrieved all requests state from the
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cache, if False we need to query the DB for the missing state.
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Args:
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group: The state group to lookup
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"""
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is_all, state_dict = self._state_group_cache.get(group)
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return state_dict, is_all
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@defer.inlineCallbacks
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def _get_state_for_groups(self, groups, types=None):
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"""Given list of groups returns dict of group -> list of state events
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with matching types. `types` is a list of `(type, state_key)`, where
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a `state_key` of None matches all state_keys. If `types` is None then
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all events are returned.
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"""
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results = {}
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missing_groups = []
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if types is not None:
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for group in set(groups):
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state_dict, missing_types, got_all = self._get_some_state_from_cache(
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group, types
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)
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results[group] = state_dict
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if not got_all:
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missing_groups.append(group)
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else:
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for group in set(groups):
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state_dict, got_all = self._get_all_state_from_cache(
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group
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)
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results[group] = state_dict
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if not got_all:
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missing_groups.append(group)
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if not missing_groups:
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defer.returnValue({
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group: {
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type_tuple: event
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for type_tuple, event in state.items()
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if event
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}
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for group, state in results.items()
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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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group_state_dict = yield self._get_state_groups_from_groups(
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missing_groups, types
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)
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state_events = yield self._get_events(
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[e_id for l in group_state_dict.values() for e_id in l],
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get_prev_content=False
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)
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state_events = {e.event_id: e for e in state_events}
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# Now we want to update the cache with all the things we fetched
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# from the database.
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for group, state_ids in group_state_dict.items():
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if types:
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# We delibrately put key -> None mappings into the cache to
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# cache absence of the key, on the assumption that if we've
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# explicitly asked for some types then we will probably ask
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# for them again.
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state_dict = {key: None for key in types}
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state_dict.update(results[group])
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results[group] = state_dict
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else:
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state_dict = results[group]
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for event_id in state_ids:
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try:
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state_event = state_events[event_id]
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state_dict[(state_event.type, state_event.state_key)] = state_event
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except KeyError:
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# Hmm. So we do don't have that state event? Interesting.
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logger.warn(
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"Can't find state event %r for state group %r",
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event_id, group,
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)
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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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# Remove all the entries with None values. The None values were just
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# used for bookkeeping in the cache.
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for group, state_dict in results.items():
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results[group] = {
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key: event for key, event in state_dict.items() if event
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}
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defer.returnValue(results)
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