# Copyright 2022 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import (
TYPE_CHECKING,
Any,
Awaitable,
Callable,
Collection,
Dict,
Iterable,
List,
Mapping,
Optional,
Tuple,
)
from synapse.api.constants import EventTypes
from synapse.events import EventBase
from synapse.logging.opentracing import tag_args, trace
from synapse.storage.roommember import ProfileInfo
from synapse.storage.state import StateFilter
from synapse.storage.util.partial_state_events_tracker import (
PartialCurrentStateTracker,
PartialStateEventsTracker,
)
from synapse.types import MutableStateMap, StateMap
from synapse.util.cancellation import cancellable
if TYPE_CHECKING:
from synapse.server import HomeServer
from synapse.storage.databases import Databases
logger = logging.getLogger(__name__)
class StateStorageController:
"""High level interface to fetching state for an event, or the current state
in a room.
"""
def __init__(self, hs: "HomeServer", stores: "Databases"):
self._is_mine_id = hs.is_mine_id
self.stores = stores
self._partial_state_events_tracker = PartialStateEventsTracker(stores.main)
self._partial_state_room_tracker = PartialCurrentStateTracker(stores.main)
def notify_event_un_partial_stated(self, event_id: str) -> None:
self._partial_state_events_tracker.notify_un_partial_stated(event_id)
def notify_room_un_partial_stated(self, room_id: str) -> None:
"""Notify that the room no longer has any partial state.
Must be called after `DataStore.clear_partial_state_room`
"""
self._partial_state_room_tracker.notify_un_partial_stated(room_id)
async def get_state_group_delta(
self, state_group: int
) -> Tuple[Optional[int], Optional[StateMap[str]]]:
"""Given a state group try to return a previous group and a delta between
the old and the new.
Args:
state_group: The state group used to retrieve state deltas.
Returns:
A tuple of the previous group and a state map of the event IDs which
make up the delta between the old and new state groups.
"""
state_group_delta = await self.stores.state.get_state_group_delta(state_group)
return state_group_delta.prev_group, state_group_delta.delta_ids
async def get_state_groups_ids(
self, _room_id: str, event_ids: Collection[str], await_full_state: bool = True
) -> Dict[int, MutableStateMap[str]]:
"""Get the event IDs of all the state for the state groups for the given events
Args:
_room_id: id of the room for these events
event_ids: ids of the events
await_full_state: if `True`, will block if we do not yet have complete
state at these events.
Returns:
dict of state_group_id -> (dict of (type, state_key) -> event id)
Raises:
RuntimeError if we don't have a state group for one or more of the events
(ie they are outliers or unknown)
"""
if not event_ids:
return {}
event_to_groups = await self.get_state_group_for_events(
event_ids, await_full_state=await_full_state
)
groups = set(event_to_groups.values())
group_to_state = await self.stores.state._get_state_for_groups(groups)
return group_to_state
async def get_state_ids_for_group(
self, state_group: int, state_filter: Optional[StateFilter] = None
) -> StateMap[str]:
"""Get the event IDs of all the state in the given state group
Args:
state_group: A state group for which we want to get the state IDs.
state_filter: specifies the type of state event to fetch from DB, example: EventTypes.JoinRules
Returns:
Resolves to a map of (type, state_key) -> event_id
"""
group_to_state = await self.get_state_for_groups((state_group,), state_filter)
return group_to_state[state_group]
async def get_state_groups(
self, room_id: str, event_ids: Collection[str]
) -> Dict[int, List[EventBase]]:
"""Get the state groups for the given list of event_ids
Args:
room_id: ID of the room for these events.
event_ids: The event IDs to retrieve state for.
Returns:
dict of state_group_id -> list of state events.
"""
if not event_ids:
return {}
group_to_ids = await self.get_state_groups_ids(room_id, event_ids)
state_event_map = await self.stores.main.get_events(
[
ev_id
for group_ids in group_to_ids.values()
for ev_id in group_ids.values()
],
get_prev_content=False,
)
return {
group: [
state_event_map[v]
for v in event_id_map.values()
if v in state_event_map
]
for group, event_id_map in group_to_ids.items()
}
def _get_state_groups_from_groups(
self, groups: List[int], state_filter: StateFilter
) -> Awaitable[Dict[int, StateMap[str]]]:
"""Returns the state groups for a given set of groups, filtering on
types of state events.
Args:
groups: list of state group IDs to query
state_filter: The state filter used to fetch state
from the database.
Returns:
Dict of state group to state map.
"""
return self.stores.state._get_state_groups_from_groups(groups, state_filter)
@trace
async def get_state_for_events(
self, event_ids: Collection[str], state_filter: Optional[StateFilter] = None
) -> Dict[str, StateMap[EventBase]]:
"""Given a list of event_ids and type tuples, return a list of state
dicts for each event.
Args:
event_ids: The events to fetch the state of.
state_filter: The state filter used to fetch state.
Returns:
A dict of (event_id) -> (type, state_key) -> [state_events]
Raises:
RuntimeError if we don't have a state group for one or more of the events
(ie they are outliers or unknown)
"""
await_full_state = True
if state_filter and not state_filter.must_await_full_state(self._is_mine_id):
await_full_state = False
event_to_groups = await self.get_state_group_for_events(
event_ids, await_full_state=await_full_state
)
groups = set(event_to_groups.values())
group_to_state = await self.stores.state._get_state_for_groups(
groups, state_filter or StateFilter.all()
)
state_event_map = await self.stores.main.get_events(
[ev_id for sd in group_to_state.values() for ev_id in sd.values()],
get_prev_content=False,
)
event_to_state = {
event_id: {
k: state_event_map[v]
for k, v in group_to_state[group].items()
if v in state_event_map
}
for event_id, group in event_to_groups.items()
}
return {event: event_to_state[event] for event in event_ids}
@trace
@tag_args
@cancellable
async def get_state_ids_for_events(
self,
event_ids: Collection[str],
state_filter: Optional[StateFilter] = None,
await_full_state: bool = True,
) -> Dict[str, StateMap[str]]:
"""
Get the state dicts corresponding to a list of events, containing the event_ids
of the state events (as opposed to the events themselves)
Args:
event_ids: events whose state should be returned
state_filter: The state filter used to fetch state from the database.
await_full_state: if `True`, will block if we do not yet have complete state
at these events and `state_filter` is not satisfied by partial state.
Defaults to `True`.
Returns:
A dict from event_id -> (type, state_key) -> event_id
Raises:
RuntimeError if we don't have a state group for one or more of the events
(ie they are outliers or unknown)
"""
if (
await_full_state
and state_filter
and not state_filter.must_await_full_state(self._is_mine_id)
):
# Full state is not required if the state filter is restrictive enough.
await_full_state = False
event_to_groups = await self.get_state_group_for_events(
event_ids, await_full_state=await_full_state
)
groups = set(event_to_groups.values())
group_to_state = await self.stores.state._get_state_for_groups(
groups, state_filter or StateFilter.all()
)
event_to_state = {
event_id: group_to_state[group]
for event_id, group in event_to_groups.items()
}
return {event: event_to_state[event] for event in event_ids}
async def get_state_for_event(
self, event_id: str, state_filter: Optional[StateFilter] = None
) -> StateMap[EventBase]:
"""
Get the state dict corresponding to a particular event
Args:
event_id: event whose state should be returned
state_filter: The state filter used to fetch state from the database.
Returns:
A dict from (type, state_key) -> state_event
Raises:
RuntimeError if we don't have a state group for the event (ie it is an
outlier or is unknown)
"""
state_map = await self.get_state_for_events(
[event_id], state_filter or StateFilter.all()
)
return state_map[event_id]
@trace
async def get_state_ids_for_event(
self,
event_id: str,
state_filter: Optional[StateFilter] = None,
await_full_state: bool = True,
) -> StateMap[str]:
"""
Get the state dict corresponding to a particular event
Args:
event_id: event whose state should be returned
state_filter: The state filter used to fetch state from the database.
await_full_state: if `True`, will block if we do not yet have complete state
at the event and `state_filter` is not satisfied by partial state.
Defaults to `True`.
Returns:
A dict from (type, state_key) -> state_event_id
Raises:
RuntimeError if we don't have a state group for the event (ie it is an
outlier or is unknown)
"""
state_map = await self.get_state_ids_for_events(
[event_id],
state_filter or StateFilter.all(),
await_full_state=await_full_state,
)
return state_map[event_id]
def get_state_for_groups(
self, groups: Iterable[int], state_filter: Optional[StateFilter] = None
) -> Awaitable[Dict[int, MutableStateMap[str]]]:
"""Gets the state at each of a list of state groups, optionally
filtering by type/state_key
Args:
groups: list of state groups for which we want to get the state.
state_filter: The state filter used to fetch state.
from the database.
Returns:
Dict of state group to state map.
"""
return self.stores.state._get_state_for_groups(
groups, state_filter or StateFilter.all()
)
@trace
@tag_args
@cancellable
async def get_state_group_for_events(
self,
event_ids: Collection[str],
await_full_state: bool = True,
) -> Mapping[str, int]:
"""Returns mapping event_id -> state_group
Args:
event_ids: events to get state groups for
await_full_state: if true, will block if we do not yet have complete
state at these events.
Raises:
RuntimeError if we don't have a state group for one or more of the events
(ie. they are outliers or unknown)
"""
if await_full_state:
await self._partial_state_events_tracker.await_full_state(event_ids)
return await self.stores.main._get_state_group_for_events(event_ids)
async def store_state_group(
self,
event_id: str,
room_id: str,
prev_group: Optional[int],
delta_ids: Optional[StateMap[str]],
current_state_ids: Optional[StateMap[str]],
) -> int:
"""Store a new set of state, returning a newly assigned state group.
Args:
event_id: The event ID for which the state was calculated.
room_id: ID of the room for which the state was calculated.
prev_group: A previous state group for the room, optional.
delta_ids: The delta between state at `prev_group` and
`current_state_ids`, if `prev_group` was given. Same format as
`current_state_ids`.
current_state_ids: The state to store. Map of (type, state_key)
to event_id.
Returns:
The state group ID
"""
return await self.stores.state.store_state_group(
event_id, room_id, prev_group, delta_ids, current_state_ids
)
@cancellable
async def get_current_state_ids(
self,
room_id: str,
state_filter: Optional[StateFilter] = None,
on_invalidate: Optional[Callable[[], None]] = None,
) -> StateMap[str]:
"""Get the current state event ids for a room based on the
current_state_events table.
If a state filter is given (that is not `StateFilter.all()`) the query
result is *not* cached.
Args:
room_id: The room to get the state IDs of. state_filter: The state
filter used to fetch state from the
database.
on_invalidate: Callback for when the `get_current_state_ids` cache
for the room gets invalidated.
Returns:
The current state of the room.
"""
if not state_filter or state_filter.must_await_full_state(self._is_mine_id):
await self._partial_state_room_tracker.await_full_state(room_id)
if state_filter and not state_filter.is_full():
return await self.stores.main.get_partial_filtered_current_state_ids(
room_id, state_filter
)
else:
return await self.stores.main.get_partial_current_state_ids(
room_id, on_invalidate=on_invalidate
)
async def get_canonical_alias_for_room(self, room_id: str) -> Optional[str]:
"""Get canonical alias for room, if any
Args:
room_id: The room ID
Returns:
The canonical alias, if any
"""
state = await self.get_current_state_ids(
room_id, StateFilter.from_types([(EventTypes.CanonicalAlias, "")])
)
event_id = state.get((EventTypes.CanonicalAlias, ""))
if not event_id:
return None
event = await self.stores.main.get_event(event_id, allow_none=True)
if not event:
return None
return event.content.get("canonical_alias")
async def get_current_state_deltas(
self, prev_stream_id: int, max_stream_id: int
) -> Tuple[int, List[Dict[str, Any]]]:
"""Fetch a list of room state changes since the given stream id
Each entry in the result contains the following fields:
- stream_id (int)
- room_id (str)
- type (str): event type
- state_key (str):
- event_id (str|None): new event_id for this state key. None if the
state has been deleted.
- prev_event_id (str|None): previous event_id for this state key. None
if it's new state.
Args:
prev_stream_id: point to get changes since (exclusive)
max_stream_id: the point that we know has been correctly persisted
- ie, an upper limit to return changes from.
Returns:
A tuple consisting of:
- the stream id which these results go up to
- list of current_state_delta_stream rows. If it is empty, we are
up to date.
"""
# FIXME(faster_joins): what do we do here?
# https://github.com/matrix-org/synapse/issues/12814
# https://github.com/matrix-org/synapse/issues/12815
# https://github.com/matrix-org/synapse/issues/13008
return await self.stores.main.get_partial_current_state_deltas(
prev_stream_id, max_stream_id
)
@trace
async def get_current_state(
self, room_id: str, state_filter: Optional[StateFilter] = None
) -> StateMap[EventBase]:
"""Same as `get_current_state_ids` but also fetches the events"""
state_map_ids = await self.get_current_state_ids(room_id, state_filter)
event_map = await self.stores.main.get_events(list(state_map_ids.values()))
state_map = {}
for key, event_id in state_map_ids.items():
event = event_map.get(event_id)
if event:
state_map[key] = event
return state_map
async def get_current_state_event(
self, room_id: str, event_type: str, state_key: str
) -> Optional[EventBase]:
"""Get the current state event for the given type/state_key."""
key = (event_type, state_key)
state_map = await self.get_current_state(
room_id, StateFilter.from_types((key,))
)
return state_map.get(key)
async def get_current_hosts_in_room(self, room_id: str) -> List[str]:
"""Get current hosts in room based on current state."""
await self._partial_state_room_tracker.await_full_state(room_id)
return await self.stores.main.get_current_hosts_in_room(room_id)
async def get_users_in_room_with_profiles(
self, room_id: str
) -> Dict[str, ProfileInfo]:
"""
Get the current users in the room with their profiles.
If the room is currently partial-stated, this will block until the room has
full state.
"""
await self._partial_state_room_tracker.await_full_state(room_id)
return await self.stores.main.get_users_in_room_with_profiles(room_id)