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Add type hints for state. (#8140)

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Patrick Cloke 2020-08-24 14:25:27 -04:00 committed by GitHub
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10 changed files with 420 additions and 203 deletions
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1
changelog.d/8140.misc Normal file
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@ -0,0 +1 @@
Add type hints to `synapse.state`.

47
stubs/frozendict.pyi Normal file
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@ -0,0 +1,47 @@
# -*- coding: utf-8 -*-
# Copyright 2020 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.
# Stub for frozendict.
from typing import (
Any,
Hashable,
Iterable,
Iterator,
Mapping,
overload,
Tuple,
TypeVar,
)
_KT = TypeVar("_KT", bound=Hashable) # Key type.
_VT = TypeVar("_VT") # Value type.
class frozendict(Mapping[_KT, _VT]):
@overload
def __init__(self, **kwargs: _VT) -> None: ...
@overload
def __init__(self, __map: Mapping[_KT, _VT], **kwargs: _VT) -> None: ...
@overload
def __init__(
self, __iterable: Iterable[Tuple[_KT, _VT]], **kwargs: _VT
) -> None: ...
def __getitem__(self, key: _KT) -> _VT: ...
def __contains__(self, key: Any) -> bool: ...
def copy(self, **add_or_replace: Any) -> frozendict: ...
def __iter__(self) -> Iterator[_KT]: ...
def __len__(self) -> int: ...
def __repr__(self) -> str: ...
def __hash__(self) -> int: ...

4
synapse/federation/sender/__init__.py
View file

@ -329,10 +329,10 @@ class FederationSender(object):
room_id = receipt.room_id
# Work out which remote servers should be poked and poke them.
domains = await self.state.get_current_hosts_in_room(room_id)
domains_set = await self.state.get_current_hosts_in_room(room_id)
domains = [
d
for d in domains
for d in domains_set
if d != self.server_name
and self._federation_shard_config.should_handle(self._instance_name, d)
]

10
synapse/handlers/federation.py
View file

@ -2134,10 +2134,10 @@ class FederationHandler(BaseHandler):
)
state_sets = list(state_sets.values())
state_sets.append(state)
current_state_ids = await self.state_handler.resolve_events(
current_states = await self.state_handler.resolve_events(
room_version, state_sets, event
)
current_state_ids = {k: e.event_id for k, e in current_state_ids.items()}
current_state_ids = {k: e.event_id for k, e in current_states.items()}
else:
current_state_ids = await self.state_handler.get_current_state_ids(
event.room_id, latest_event_ids=extrem_ids
@ -2149,9 +2149,11 @@ class FederationHandler(BaseHandler):
# Now check if event pass auth against said current state
auth_types = auth_types_for_event(event)
current_state_ids = [e for k, e in current_state_ids.items() if k in auth_types]
current_state_ids_list = [
e for k, e in current_state_ids.items() if k in auth_types
]
auth_events_map = await self.store.get_events(current_state_ids)
auth_events_map = await self.store.get_events(current_state_ids_list)
current_auth_events = {
(e.type, e.state_key): e for e in auth_events_map.values()
}

6
synapse/handlers/presence.py
View file

@ -40,7 +40,7 @@ from synapse.metrics import LaterGauge
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.state import StateHandler
from synapse.storage.databases.main import DataStore
from synapse.types import JsonDict, UserID, get_domain_from_id
from synapse.types import Collection, JsonDict, UserID, get_domain_from_id
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.descriptors import cached
from synapse.util.metrics import Measure
@ -1318,7 +1318,7 @@ async def get_interested_parties(
async def get_interested_remotes(
store: DataStore, states: List[UserPresenceState], state_handler: StateHandler
) -> List[Tuple[List[str], List[UserPresenceState]]]:
) -> List[Tuple[Collection[str], List[UserPresenceState]]]:
"""Given a list of presence states figure out which remote servers
should be sent which.
@ -1334,7 +1334,7 @@ async def get_interested_remotes(
each tuple the list of UserPresenceState should be sent to each
destination
"""
hosts_and_states = []
hosts_and_states = [] # type: List[Tuple[Collection[str], List[UserPresenceState]]]
# First we look up the rooms each user is in (as well as any explicit
# subscriptions), then for each distinct room we look up the remote

20
synapse/handlers/room_member.py
View file

@ -17,7 +17,7 @@ import abc
import logging
import random
from http import HTTPStatus
from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Tuple, Union
from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple, Union
from unpaddedbase64 import encode_base64
@ -38,7 +38,15 @@ from synapse.events.builder import create_local_event_from_event_dict
from synapse.events.snapshot import EventContext
from synapse.events.validator import EventValidator
from synapse.storage.roommember import RoomsForUser
from synapse.types import Collection, JsonDict, Requester, RoomAlias, RoomID, UserID
from synapse.types import (
Collection,
JsonDict,
Requester,
RoomAlias,
RoomID,
StateMap,
UserID,
)
from synapse.util.async_helpers import Linearizer
from synapse.util.distributor import user_joined_room, user_left_room
@ -738,9 +746,7 @@ class RoomMemberHandler(object):
if prev_member_event.membership == Membership.JOIN:
await self._user_left_room(target_user, room_id)
async def _can_guest_join(
self, current_state_ids: Dict[Tuple[str, str], str]
) -> bool:
async def _can_guest_join(self, current_state_ids: StateMap[str]) -> bool:
"""
Returns whether a guest can join a room based on its current state.
"""
@ -969,9 +975,7 @@ class RoomMemberHandler(object):
)
return stream_id
async def _is_host_in_room(
self, current_state_ids: Dict[Tuple[str, str], str]
) -> bool:
async def _is_host_in_room(self, current_state_ids: StateMap[str]) -> bool:
# Have we just created the room, and is this about to be the very
# first member event?
create_event_id = current_state_ids.get(("m.room.create", ""))

186
synapse/state/__init__.py
View file

@ -16,11 +16,22 @@
import logging
from collections import namedtuple
from typing import Awaitable, Dict, Iterable, List, Optional, Set
from typing import (
Awaitable,
Dict,
Iterable,
List,
Optional,
Sequence,
Set,
Union,
overload,
)
import attr
from frozendict import frozendict
from prometheus_client import Histogram
from typing_extensions import Literal
from synapse.api.constants import EventTypes
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, StateResolutionVersions
@ -30,7 +41,7 @@ from synapse.logging.utils import log_function
from synapse.state import v1, v2
from synapse.storage.databases.main.events_worker import EventRedactBehaviour
from synapse.storage.roommember import ProfileInfo
from synapse.types import StateMap
from synapse.types import Collection, StateMap
from synapse.util import Clock
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.expiringcache import ExpiringCache
@ -68,8 +79,14 @@ def _gen_state_id():
class _StateCacheEntry(object):
__slots__ = ["state", "state_group", "state_id", "prev_group", "delta_ids"]
def __init__(self, state, state_group, prev_group=None, delta_ids=None):
# dict[(str, str), str] map from (type, state_key) to event_id
def __init__(
self,
state: StateMap[str],
state_group: Optional[int],
prev_group: Optional[int] = None,
delta_ids: Optional[StateMap[str]] = None,
):
# A map from (type, state_key) to event_id.
self.state = frozendict(state)
# the ID of a state group if one and only one is involved.
@ -107,9 +124,33 @@ class StateHandler(object):
self.hs = hs
self._state_resolution_handler = hs.get_state_resolution_handler()
@overload
async def get_current_state(
self, room_id, event_type=None, state_key="", latest_event_ids=None
):
self,
room_id: str,
event_type: Literal[None] = None,
state_key: str = "",
latest_event_ids: Optional[List[str]] = None,
) -> StateMap[EventBase]:
...
@overload
async def get_current_state(
self,
room_id: str,
event_type: str,
state_key: str = "",
latest_event_ids: Optional[List[str]] = None,
) -> Optional[EventBase]:
...
async def get_current_state(
self,
room_id: str,
event_type: Optional[str] = None,
state_key: str = "",
latest_event_ids: Optional[List[str]] = None,
) -> Union[Optional[EventBase], StateMap[EventBase]]:
"""Retrieves the current state for the room. This is done by
calling `get_latest_events_in_room` to get the leading edges of the
event graph and then resolving any of the state conflicts.
@ -117,14 +158,15 @@ class StateHandler(object):
This is equivalent to getting the state of an event that were to send
next before receiving any new events.
Returns:
If `event_type` is specified, then the method returns only the one
event (or None) with that `event_type` and `state_key`.
Returns:
map from (type, state_key) to event
Otherwise, a map from (type, state_key) to event.
"""
if not latest_event_ids:
latest_event_ids = await self.store.get_latest_event_ids_in_room(room_id)
assert latest_event_ids is not None
logger.debug("calling resolve_state_groups from get_current_state")
ret = await self.resolve_state_groups_for_events(room_id, latest_event_ids)
@ -140,34 +182,30 @@ class StateHandler(object):
state_map = await self.store.get_events(
list(state.values()), get_prev_content=False
)
state = {
return {
key: state_map[e_id] for key, e_id in state.items() if e_id in state_map
}
return state
async def get_current_state_ids(self, room_id, latest_event_ids=None):
async def get_current_state_ids(
self, room_id: str, latest_event_ids: Optional[Iterable[str]] = None
) -> StateMap[str]:
"""Get the current state, or the state at a set of events, for a room
Args:
room_id (str):
latest_event_ids (iterable[str]|None): if given, the forward
extremities to resolve. If None, we look them up from the
database (via a cache)
room_id:
latest_event_ids: if given, the forward extremities to resolve. If
None, we look them up from the database (via a cache).
Returns:
Deferred[dict[(str, str), str)]]: the state dict, mapping from
(event_type, state_key) -> event_id
the state dict, mapping from (event_type, state_key) -> event_id
"""
if not latest_event_ids:
latest_event_ids = await self.store.get_latest_event_ids_in_room(room_id)
assert latest_event_ids is not None
logger.debug("calling resolve_state_groups from get_current_state_ids")
ret = await self.resolve_state_groups_for_events(room_id, latest_event_ids)
state = ret.state
return state
return dict(ret.state)
async def get_current_users_in_room(
self, room_id: str, latest_event_ids: Optional[List[str]] = None
@ -183,32 +221,34 @@ class StateHandler(object):
"""
if not latest_event_ids:
latest_event_ids = await self.store.get_latest_event_ids_in_room(room_id)
assert latest_event_ids is not None
logger.debug("calling resolve_state_groups from get_current_users_in_room")
entry = await self.resolve_state_groups_for_events(room_id, latest_event_ids)
joined_users = await self.store.get_joined_users_from_state(room_id, entry)
return joined_users
return await self.store.get_joined_users_from_state(room_id, entry)
async def get_current_hosts_in_room(self, room_id):
async def get_current_hosts_in_room(self, room_id: str) -> Set[str]:
event_ids = await self.store.get_latest_event_ids_in_room(room_id)
return await self.get_hosts_in_room_at_events(room_id, event_ids)
async def get_hosts_in_room_at_events(self, room_id, event_ids):
async def get_hosts_in_room_at_events(
self, room_id: str, event_ids: List[str]
) -> Set[str]:
"""Get the hosts that were in a room at the given event ids
Args:
room_id (str):
event_ids (list[str]):
room_id:
event_ids:
Returns:
Deferred[list[str]]: the hosts in the room at the given events
The hosts in the room at the given events
"""
entry = await self.resolve_state_groups_for_events(room_id, event_ids)
joined_hosts = await self.store.get_joined_hosts(room_id, entry)
return joined_hosts
return await self.store.get_joined_hosts(room_id, entry)
async def compute_event_context(
self, event: EventBase, old_state: Optional[Iterable[EventBase]] = None
):
) -> EventContext:
"""Build an EventContext structure for the event.
This works out what the current state should be for the event, and
@ -221,7 +261,7 @@ class StateHandler(object):
when receiving an event from federation where we don't have the
prev events for, e.g. when backfilling.
Returns:
synapse.events.snapshot.EventContext:
The event context.
"""
if event.internal_metadata.is_outlier():
@ -275,7 +315,7 @@ class StateHandler(object):
event.room_id, event.prev_event_ids()
)
state_ids_before_event = entry.state
state_ids_before_event = dict(entry.state)
state_group_before_event = entry.state_group
state_group_before_event_prev_group = entry.prev_group
deltas_to_state_group_before_event = entry.delta_ids
@ -346,19 +386,18 @@ class StateHandler(object):
)
@measure_func()
async def resolve_state_groups_for_events(self, room_id, event_ids):
async def resolve_state_groups_for_events(
self, room_id: str, event_ids: Iterable[str]
) -> _StateCacheEntry:
""" Given a list of event_ids this method fetches the state at each
event, resolves conflicts between them and returns them.
Args:
room_id (str)
event_ids (list[str])
explicit_room_version (str|None): If set uses the the given room
version to choose the resolution algorithm. If None, then
checks the database for room version.
room_id
event_ids
Returns:
Deferred[_StateCacheEntry]: resolved state
The resolved state
"""
logger.debug("resolve_state_groups event_ids %s", event_ids)
@ -394,7 +433,12 @@ class StateHandler(object):
)
return result
async def resolve_events(self, room_version, state_sets, event):
async def resolve_events(
self,
room_version: str,
state_sets: Collection[Iterable[EventBase]],
event: EventBase,
) -> StateMap[EventBase]:
logger.info(
"Resolving state for %s with %d groups", event.room_id, len(state_sets)
)
@ -414,9 +458,7 @@ class StateHandler(object):
state_res_store=StateResolutionStore(self.store),
)
new_state = {key: state_map[ev_id] for key, ev_id in new_state.items()}
return new_state
return {key: state_map[ev_id] for key, ev_id in new_state.items()}
class StateResolutionHandler(object):
@ -444,7 +486,12 @@ class StateResolutionHandler(object):
@log_function
async def resolve_state_groups(
self, room_id, room_version, state_groups_ids, event_map, state_res_store
self,
room_id: str,
room_version: str,
state_groups_ids: Dict[int, StateMap[str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "StateResolutionStore",
):
"""Resolves conflicts between a set of state groups
@ -452,13 +499,13 @@ class StateResolutionHandler(object):
not be called for a single state group
Args:
room_id (str): room we are resolving for (used for logging and sanity checks)
room_version (str): version of the room
state_groups_ids (dict[int, dict[(str, str), str]]):
map from state group id to the state in that state group
room_id: room we are resolving for (used for logging and sanity checks)
room_version: version of the room
state_groups_ids:
A map from state group id to the state in that state group
(where 'state' is a map from state key to event id)
event_map(dict[str,FrozenEvent]|None):
event_map:
a dict from event_id to event, for any events that we happen to
have in flight (eg, those currently being persisted). This will be
used as a starting point fof finding the state we need; any missing
@ -466,10 +513,10 @@ class StateResolutionHandler(object):
If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore)
state_res_store
Returns:
_StateCacheEntry: resolved state
The resolved state
"""
logger.debug("resolve_state_groups state_groups %s", state_groups_ids.keys())
@ -530,21 +577,22 @@ class StateResolutionHandler(object):
return cache
def _make_state_cache_entry(new_state, state_groups_ids):
def _make_state_cache_entry(
new_state: StateMap[str], state_groups_ids: Dict[int, StateMap[str]]
) -> _StateCacheEntry:
"""Given a resolved state, and a set of input state groups, pick one to base
a new state group on (if any), and return an appropriately-constructed
_StateCacheEntry.
Args:
new_state (dict[(str, str), str]): resolved state map (mapping from
(type, state_key) to event_id)
new_state: resolved state map (mapping from (type, state_key) to event_id)
state_groups_ids (dict[int, dict[(str, str), str]]):
map from state group id to the state in that state group
(where 'state' is a map from state key to event id)
state_groups_ids:
map from state group id to the state in that state group (where
'state' is a map from state key to event id)
Returns:
_StateCacheEntry
The cache entry.
"""
# if the new state matches any of the input state groups, we can
# use that state group again. Otherwise we will generate a state_id
@ -585,7 +633,7 @@ def resolve_events_with_store(
clock: Clock,
room_id: str,
room_version: str,
state_sets: List[StateMap[str]],
state_sets: Sequence[StateMap[str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "StateResolutionStore",
) -> Awaitable[StateMap[str]]:
@ -633,15 +681,17 @@ class StateResolutionStore(object):
store = attr.ib()
def get_events(self, event_ids, allow_rejected=False):
def get_events(
self, event_ids: Iterable[str], allow_rejected: bool = False
) -> Awaitable[Dict[str, EventBase]]:
"""Get events from the database
Args:
event_ids (list): The event_ids of the events to fetch
allow_rejected (bool): If True return rejected events.
event_ids: The event_ids of the events to fetch
allow_rejected: If True return rejected events.
Returns:
Awaitable[dict[str, FrozenEvent]]: Dict from event_id to event.
An awaitable which resolves to a dict from event_id to event.
"""
return self.store.get_events(
@ -651,7 +701,9 @@ class StateResolutionStore(object):
allow_rejected=allow_rejected,
)
def get_auth_chain_difference(self, state_sets: List[Set[str]]):
def get_auth_chain_difference(
self, state_sets: List[Set[str]]
) -> Awaitable[Set[str]]:
"""Given sets of state events figure out the auth chain difference (as
per state res v2 algorithm).
@ -660,7 +712,7 @@ class StateResolutionStore(object):
chain.
Returns:
Deferred[Set[str]]: Set of event IDs.
An awaitable that resolves to a set of event IDs.
"""
return self.store.get_auth_chain_difference(state_sets)

77
synapse/state/v1.py
View file

@ -15,7 +15,17 @@
import hashlib
import logging
from typing import Awaitable, Callable, Dict, List, Optional
from typing import (
Awaitable,
Callable,
Dict,
Iterable,
List,
Optional,
Sequence,
Set,
Tuple,
)
from synapse import event_auth
from synapse.api.constants import EventTypes
@ -32,10 +42,10 @@ POWER_KEY = (EventTypes.PowerLevels, "")
async def resolve_events_with_store(
room_id: str,
state_sets: List[StateMap[str]],
state_sets: Sequence[StateMap[str]],
event_map: Optional[Dict[str, EventBase]],
state_map_factory: Callable[[List[str]], Awaitable],
):
state_map_factory: Callable[[Iterable[str]], Awaitable[Dict[str, EventBase]]],
) -> StateMap[str]:
"""
Args:
room_id: the room we are working in
@ -56,8 +66,7 @@ async def resolve_events_with_store(
an Awaitable that resolves to a dict of event_id to event.
Returns:
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
A map from (type, state_key) to event_id.
"""
if len(state_sets) == 1:
return state_sets[0]
@ -75,8 +84,8 @@ async def resolve_events_with_store(
"Asking for %d/%d conflicted events", len(needed_events), needed_event_count
)
# dict[str, FrozenEvent]: a map from state event id to event. Only includes
# the state events which are in conflict (and those in event_map)
# A map from state event id to event. Only includes the state events which
# are in conflict (and those in event_map).
state_map = await state_map_factory(needed_events)
if event_map is not None:
state_map.update(event_map)
@ -91,8 +100,6 @@ async def resolve_events_with_store(
# get the ids of the auth events which allow us to authenticate the
# conflicted state, picking only from the unconflicting state.
#
# dict[(str, str), str]: a map from state key to event id
auth_events = _create_auth_events_from_maps(
unconflicted_state, conflicted_state, state_map
)
@ -122,18 +129,19 @@ async def resolve_events_with_store(
)
def _seperate(state_sets):
def _seperate(
state_sets: Iterable[StateMap[str]],
) -> Tuple[StateMap[str], StateMap[Set[str]]]:
"""Takes the state_sets and figures out which keys are conflicted and
which aren't. i.e., which have multiple different event_ids associated
with them in different state sets.
Args:
state_sets(iterable[dict[(str, str), str]]):
state_sets:
List of dicts of (type, state_key) -> event_id, which are the
different state groups to resolve.
Returns:
(dict[(str, str), str], dict[(str, str), set[str]]):
A tuple of (unconflicted_state, conflicted_state), where:
unconflicted_state is a dict mapping (type, state_key)->event_id
@ -144,7 +152,7 @@ def _seperate(state_sets):
"""
state_set_iterator = iter(state_sets)
unconflicted_state = dict(next(state_set_iterator))
conflicted_state = {}
conflicted_state = {} # type: StateMap[Set[str]]
for state_set in state_set_iterator:
for key, value in state_set.items():
@ -171,7 +179,21 @@ def _seperate(state_sets):
return unconflicted_state, conflicted_state
def _create_auth_events_from_maps(unconflicted_state, conflicted_state, state_map):
def _create_auth_events_from_maps(
unconflicted_state: StateMap[str],
conflicted_state: StateMap[Set[str]],
state_map: Dict[str, EventBase],
) -> StateMap[str]:
"""
Args:
unconflicted_state: The unconflicted state map.
conflicted_state: The conflicted state map.
state_map:
Returns:
A map from state key to event id.
"""
auth_events = {}
for event_ids in conflicted_state.values():
for event_id in event_ids:
@ -179,14 +201,17 @@ def _create_auth_events_from_maps(unconflicted_state, conflicted_state, state_ma
keys = event_auth.auth_types_for_event(state_map[event_id])
for key in keys:
if key not in auth_events:
event_id = unconflicted_state.get(key, None)
if event_id:
auth_events[key] = event_id
auth_event_id = unconflicted_state.get(key, None)
if auth_event_id:
auth_events[key] = auth_event_id
return auth_events
def _resolve_with_state(
unconflicted_state_ids, conflicted_state_ids, auth_event_ids, state_map
unconflicted_state_ids: StateMap[str],
conflicted_state_ids: StateMap[Set[str]],
auth_event_ids: StateMap[str],
state_map: Dict[str, EventBase],
):
conflicted_state = {}
for key, event_ids in conflicted_state_ids.items():
@ -215,7 +240,9 @@ def _resolve_with_state(
return new_state
def _resolve_state_events(conflicted_state, auth_events):
def _resolve_state_events(
conflicted_state: StateMap[List[EventBase]], auth_events: StateMap[EventBase]
) -> StateMap[EventBase]:
""" This is where we actually decide which of the conflicted state to
use.
@ -255,7 +282,9 @@ def _resolve_state_events(conflicted_state, auth_events):
return resolved_state
def _resolve_auth_events(events, auth_events):
def _resolve_auth_events(
events: List[EventBase], auth_events: StateMap[EventBase]
) -> EventBase:
reverse = list(reversed(_ordered_events(events)))
auth_keys = {
@ -289,7 +318,9 @@ def _resolve_auth_events(events, auth_events):
return event
def _resolve_normal_events(events, auth_events):
def _resolve_normal_events(
events: List[EventBase], auth_events: StateMap[EventBase]
) -> EventBase:
for event in _ordered_events(events):
try:
# The signatures have already been checked at this point
@ -309,7 +340,7 @@ def _resolve_normal_events(events, auth_events):
return event
def _ordered_events(events):
def _ordered_events(events: Iterable[EventBase]) -> List[EventBase]:
def key_func(e):
# we have to use utf-8 rather than ascii here because it turns out we allow
# people to send us events with non-ascii event IDs :/

255
synapse/state/v2.py
View file

@ -16,7 +16,21 @@
import heapq
import itertools
import logging
from typing import Dict, List, Optional
from typing import (
Any,
Callable,
Dict,
Generator,
Iterable,
List,
Optional,
Sequence,
Set,
Tuple,
overload,
)
from typing_extensions import Literal
import synapse.state
from synapse import event_auth
@ -40,10 +54,10 @@ async def resolve_events_with_store(
clock: Clock,
room_id: str,
room_version: str,
state_sets: List[StateMap[str]],
state_sets: Sequence[StateMap[str]],
event_map: Optional[Dict[str, EventBase]],
state_res_store: "synapse.state.StateResolutionStore",
):
) -> StateMap[str]:
"""Resolves the state using the v2 state resolution algorithm
Args:
@ -63,8 +77,7 @@ async def resolve_events_with_store(
state_res_store:
Returns:
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
A map from (type, state_key) to event_id.
"""
logger.debug("Computing conflicted state")
@ -171,18 +184,23 @@ async def resolve_events_with_store(
return resolved_state
async def _get_power_level_for_sender(room_id, event_id, event_map, state_res_store):
async def _get_power_level_for_sender(
room_id: str,
event_id: str,
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
) -> int:
"""Return the power level of the sender of the given event according to
their auth events.
Args:
room_id (str)
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
room_id
event_id
event_map
state_res_store
Returns:
Deferred[int]
The power level.
"""
event = await _get_event(room_id, event_id, event_map, state_res_store)
@ -217,17 +235,21 @@ async def _get_power_level_for_sender(room_id, event_id, event_map, state_res_st
return int(level)
async def _get_auth_chain_difference(state_sets, event_map, state_res_store):
async def _get_auth_chain_difference(
state_sets: Sequence[StateMap[str]],
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
) -> Set[str]:
"""Compare the auth chains of each state set and return the set of events
that only appear in some but not all of the auth chains.
Args:
state_sets (list)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
state_sets
event_map
state_res_store
Returns:
Deferred[set[str]]: Set of event IDs
Set of event IDs
"""
difference = await state_res_store.get_auth_chain_difference(
@ -237,17 +259,19 @@ async def _get_auth_chain_difference(state_sets, event_map, state_res_store):
return difference
def _seperate(state_sets):
def _seperate(
state_sets: Iterable[StateMap[str]],
) -> Tuple[StateMap[str], StateMap[Set[str]]]:
"""Return the unconflicted and conflicted state. This is different than in
the original algorithm, as this defines a key to be conflicted if one of
the state sets doesn't have that key.
Args:
state_sets (list)
state_sets
Returns:
tuple[dict, dict]: A tuple of unconflicted and conflicted state. The
conflicted state dict is a map from type/state_key to set of event IDs
A tuple of unconflicted and conflicted state. The conflicted state dict
is a map from type/state_key to set of event IDs
"""
unconflicted_state = {}
conflicted_state = {}
@ -260,18 +284,20 @@ def _seperate(state_sets):
event_ids.discard(None)
conflicted_state[key] = event_ids
return unconflicted_state, conflicted_state
# mypy doesn't understand that discarding None above means that conflicted
# state is StateMap[Set[str]], not StateMap[Set[Optional[Str]]].
return unconflicted_state, conflicted_state # type: ignore
def _is_power_event(event):
def _is_power_event(event: EventBase) -> bool:
"""Return whether or not the event is a "power event", as defined by the
v2 state resolution algorithm
Args:
event (FrozenEvent)
event
Returns:
boolean
True if the event is a power event.
"""
if (event.type, event.state_key) in (
(EventTypes.PowerLevels, ""),
@ -288,19 +314,23 @@ def _is_power_event(event):
async def _add_event_and_auth_chain_to_graph(
graph, room_id, event_id, event_map, state_res_store, auth_diff
):
graph: Dict[str, Set[str]],
room_id: str,
event_id: str,
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
auth_diff: Set[str],
) -> None:
"""Helper function for _reverse_topological_power_sort that add the event
and its auth chain (that is in the auth diff) to the graph
Args:
graph (dict[str, set[str]]): A map from event ID to the events auth
event IDs
room_id (str): the room we are working in
event_id (str): Event to add to the graph
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
auth_diff (set[str]): Set of event IDs that are in the auth difference.
graph: A map from event ID to the events auth event IDs
room_id: the room we are working in
event_id: Event to add to the graph
event_map
state_res_store
auth_diff: Set of event IDs that are in the auth difference.
"""
state = [event_id]
@ -318,24 +348,29 @@ async def _add_event_and_auth_chain_to_graph(
async def _reverse_topological_power_sort(
clock, room_id, event_ids, event_map, state_res_store, auth_diff
):
clock: Clock,
room_id: str,
event_ids: Iterable[str],
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
auth_diff: Set[str],
) -> List[str]:
"""Returns a list of the event_ids sorted by reverse topological ordering,
and then by power level and origin_server_ts
Args:
clock (Clock)
room_id (str): the room we are working in
event_ids (list[str]): The events to sort
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
auth_diff (set[str]): Set of event IDs that are in the auth difference.
clock
room_id: the room we are working in
event_ids: The events to sort
event_map
state_res_store
auth_diff: Set of event IDs that are in the auth difference.
Returns:
Deferred[list[str]]: The sorted list
The sorted list
"""
graph = {}
graph = {} # type: Dict[str, Set[str]]
for idx, event_id in enumerate(event_ids, start=1):
await _add_event_and_auth_chain_to_graph(
graph, room_id, event_id, event_map, state_res_store, auth_diff
@ -372,22 +407,28 @@ async def _reverse_topological_power_sort(
async def _iterative_auth_checks(
clock, room_id, room_version, event_ids, base_state, event_map, state_res_store
):
clock: Clock,
room_id: str,
room_version: str,
event_ids: List[str],
base_state: StateMap[str],
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
) -> StateMap[str]:
"""Sequentially apply auth checks to each event in given list, updating the
state as it goes along.
Args:
clock (Clock)
room_id (str)
room_version (str)
event_ids (list[str]): Ordered list of events to apply auth checks to
base_state (StateMap[str]): The set of state to start with
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
clock
room_id
room_version
event_ids: Ordered list of events to apply auth checks to
base_state: The set of state to start with
event_map
state_res_store
Returns:
Deferred[StateMap[str]]: Returns the final updated state
Returns the final updated state
"""
resolved_state = base_state.copy()
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
@ -439,21 +480,26 @@ async def _iterative_auth_checks(
async def _mainline_sort(
clock, room_id, event_ids, resolved_power_event_id, event_map, state_res_store
):
clock: Clock,
room_id: str,
event_ids: List[str],
resolved_power_event_id: Optional[str],
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
) -> List[str]:
"""Returns a sorted list of event_ids sorted by mainline ordering based on
the given event resolved_power_event_id
Args:
clock (Clock)
room_id (str): room we're working in
event_ids (list[str]): Events to sort
resolved_power_event_id (str): The final resolved power level event ID
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
clock
room_id: room we're working in
event_ids: Events to sort
resolved_power_event_id: The final resolved power level event ID
event_map
state_res_store
Returns:
Deferred[list[str]]: The sorted list
The sorted list
"""
if not event_ids:
# It's possible for there to be no event IDs here to sort, so we can
@ -505,59 +551,90 @@ async def _mainline_sort(
async def _get_mainline_depth_for_event(
event, mainline_map, event_map, state_res_store
):
event: EventBase,
mainline_map: Dict[str, int],
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
) -> int:
"""Get the mainline depths for the given event based on the mainline map
Args:
event (FrozenEvent)
mainline_map (dict[str, int]): Map from event_id to mainline depth for
events in the mainline.
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
event
mainline_map: Map from event_id to mainline depth for events in the mainline.
event_map
state_res_store
Returns:
Deferred[int]
The mainline depth
"""
room_id = event.room_id
tmp_event = event # type: Optional[EventBase]
# We do an iterative search, replacing `event with the power level in its
# auth events (if any)
while event:
while tmp_event:
depth = mainline_map.get(event.event_id)
if depth is not None:
return depth
auth_events = event.auth_event_ids()
event = None
auth_events = tmp_event.auth_event_ids()
tmp_event = None
for aid in auth_events:
aev = await _get_event(
room_id, aid, event_map, state_res_store, allow_none=True
)
if aev and (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
event = aev
tmp_event = aev
break
# Didn't find a power level auth event, so we just return 0
return 0
async def _get_event(room_id, event_id, event_map, state_res_store, allow_none=False):
@overload
async def _get_event(
room_id: str,
event_id: str,
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
allow_none: Literal[False] = False,
) -> EventBase:
...
@overload
async def _get_event(
room_id: str,
event_id: str,
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
allow_none: Literal[True],
) -> Optional[EventBase]:
...
async def _get_event(
room_id: str,
event_id: str,
event_map: Dict[str, EventBase],
state_res_store: "synapse.state.StateResolutionStore",
allow_none: bool = False,
) -> Optional[EventBase]:
"""Helper function to look up event in event_map, falling back to looking
it up in the store
Args:
room_id (str)
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
allow_none (bool): if the event is not found, return None rather than raising
room_id
event_id
event_map
state_res_store
allow_none: if the event is not found, return None rather than raising
an exception
Returns:
Deferred[Optional[FrozenEvent]]
The event, or none if the event does not exist (and allow_none is True).
"""
if event_id not in event_map:
events = await state_res_store.get_events([event_id], allow_rejected=True)
@ -577,7 +654,9 @@ async def _get_event(room_id, event_id, event_map, state_res_store, allow_none=F
return event
def lexicographical_topological_sort(graph, key):
def lexicographical_topological_sort(
graph: Dict[str, Set[str]], key: Callable[[str], Any]
) -> Generator[str, None, None]:
"""Performs a lexicographic reverse topological sort on the graph.
This returns a reverse topological sort (i.e. if node A references B then B
@ -587,20 +666,20 @@ def lexicographical_topological_sort(graph, key):
NOTE: `graph` is modified during the sort.
Args:
graph (dict[str, set[str]]): A representation of the graph where each
node is a key in the dict and its value are the nodes edges.
key (func): A function that takes a node and returns a value that is
comparable and used to order nodes
graph: A representation of the graph where each node is a key in the
dict and its value are the nodes edges.
key: A function that takes a node and returns a value that is comparable
and used to order nodes
Yields:
str: The next node in the topological sort
The next node in the topological sort
"""
# Note, this is basically Kahn's algorithm except we look at nodes with no
# outgoing edges, c.f.
# https://en.wikipedia.org/wiki/Topological_sorting#Kahn's_algorithm
outdegree_map = graph
reverse_graph = {}
reverse_graph = {} # type: Dict[str, Set[str]]
# Lists of nodes with zero out degree. Is actually a tuple of
# `(key(node), node)` so that sorting does the right thing

1
tox.ini
View file

@ -209,6 +209,7 @@ commands = mypy \
synapse/server.py \
synapse/server_notices \
synapse/spam_checker_api \
synapse/state \
synapse/storage/databases/main/ui_auth.py \
synapse/storage/database.py \
synapse/storage/engines \