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https://git.anonymousland.org/anonymousland/synapse-product.git
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![Richard van der Hoff](/assets/img/avatar_default.png)
this param doesn't seem to be used, and is a bit pointless anyway because it can easily be replicated by the caller. It is also horrible, because it changes the return type of the method.
669 lines
23 KiB
Python
669 lines
23 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse import event_auth
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from synapse.util.logutils import log_function
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.metrics import Measure
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from synapse.api.constants import EventTypes
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from synapse.api.errors import AuthError
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from synapse.events.snapshot import EventContext
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from synapse.util.async import Linearizer
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from synapse.util.caches import CACHE_SIZE_FACTOR
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from collections import namedtuple
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from frozendict import frozendict
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import logging
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import hashlib
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logger = logging.getLogger(__name__)
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KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
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SIZE_OF_CACHE = int(100000 * CACHE_SIZE_FACTOR)
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EVICTION_TIMEOUT_SECONDS = 60 * 60
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_NEXT_STATE_ID = 1
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POWER_KEY = (EventTypes.PowerLevels, "")
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def _gen_state_id():
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global _NEXT_STATE_ID
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s = "X%d" % (_NEXT_STATE_ID,)
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_NEXT_STATE_ID += 1
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return s
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class _StateCacheEntry(object):
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__slots__ = ["state", "state_group", "state_id", "prev_group", "delta_ids"]
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def __init__(self, state, state_group, prev_group=None, delta_ids=None):
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self.state = frozendict(state)
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self.state_group = state_group
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self.prev_group = prev_group
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self.delta_ids = frozendict(delta_ids) if delta_ids is not None else None
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# The `state_id` is a unique ID we generate that can be used as ID for
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# this collection of state. Usually this would be the same as the
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# state group, but on worker instances we can't generate a new state
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# group each time we resolve state, so we generate a separate one that
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# isn't persisted and is used solely for caches.
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# `state_id` is either a state_group (and so an int) or a string. This
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# ensures we don't accidentally persist a state_id as a stateg_group
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if state_group:
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self.state_id = state_group
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else:
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self.state_id = _gen_state_id()
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def __len__(self):
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return len(self.state)
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class StateHandler(object):
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""" Responsible for doing state conflict resolution.
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"""
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def __init__(self, hs):
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self.clock = hs.get_clock()
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self.store = hs.get_datastore()
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self.hs = hs
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# dict of set of event_ids -> _StateCacheEntry.
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self._state_cache = None
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self.resolve_linearizer = Linearizer(name="state_resolve_lock")
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def start_caching(self):
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logger.debug("start_caching")
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self._state_cache = ExpiringCache(
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cache_name="state_cache",
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clock=self.clock,
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max_len=SIZE_OF_CACHE,
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expiry_ms=EVICTION_TIMEOUT_SECONDS * 1000,
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iterable=True,
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reset_expiry_on_get=True,
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)
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self._state_cache.start()
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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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latest_event_ids=None):
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""" Retrieves the current state for the room. This is done by
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calling `get_latest_events_in_room` to get the leading edges of the
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event graph and then resolving any of the state conflicts.
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This is equivalent to getting the state of an event that were to send
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next before receiving any new events.
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If `event_type` is specified, then the method returns only the one
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event (or None) with that `event_type` and `state_key`.
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Returns:
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map from (type, state_key) to event
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"""
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if not latest_event_ids:
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latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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logger.debug("calling resolve_state_groups from get_current_state")
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ret = yield self.resolve_state_groups(room_id, latest_event_ids)
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state = ret.state
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if event_type:
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event_id = state.get((event_type, state_key))
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event = None
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if event_id:
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event = yield self.store.get_event(event_id, allow_none=True)
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defer.returnValue(event)
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return
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state_map = yield self.store.get_events(state.values(), get_prev_content=False)
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state = {
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key: state_map[e_id] for key, e_id in state.items() if e_id in state_map
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}
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defer.returnValue(state)
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@defer.inlineCallbacks
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def get_current_state_ids(self, room_id, latest_event_ids=None):
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if not latest_event_ids:
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latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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logger.debug("calling resolve_state_groups from get_current_state_ids")
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ret = yield self.resolve_state_groups(room_id, latest_event_ids)
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state = ret.state
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defer.returnValue(state)
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@defer.inlineCallbacks
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def get_current_user_in_room(self, room_id, latest_event_ids=None):
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if not latest_event_ids:
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latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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logger.debug("calling resolve_state_groups from get_current_user_in_room")
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entry = yield self.resolve_state_groups(room_id, latest_event_ids)
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joined_users = yield self.store.get_joined_users_from_state(room_id, entry)
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defer.returnValue(joined_users)
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@defer.inlineCallbacks
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def get_current_hosts_in_room(self, room_id, latest_event_ids=None):
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if not latest_event_ids:
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latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
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logger.debug("calling resolve_state_groups from get_current_hosts_in_room")
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entry = yield self.resolve_state_groups(room_id, latest_event_ids)
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joined_hosts = yield self.store.get_joined_hosts(room_id, entry)
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defer.returnValue(joined_hosts)
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@defer.inlineCallbacks
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def compute_event_context(self, event, old_state=None):
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"""Build an EventContext structure for the event.
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Args:
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event (synapse.events.EventBase):
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Returns:
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synapse.events.snapshot.EventContext:
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"""
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if event.internal_metadata.is_outlier():
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# If this is an outlier, then we know it shouldn't have any current
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# state. Certainly store.get_current_state won't return any, and
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# persisting the event won't store the state group.
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context = EventContext()
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if old_state:
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context.prev_state_ids = {
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(s.type, s.state_key): s.event_id for s in old_state
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}
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if event.is_state():
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context.current_state_ids = dict(context.prev_state_ids)
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key = (event.type, event.state_key)
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context.current_state_ids[key] = event.event_id
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else:
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context.current_state_ids = context.prev_state_ids
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else:
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context.current_state_ids = {}
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context.prev_state_ids = {}
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context.prev_state_events = []
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context.state_group = self.store.get_next_state_group()
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defer.returnValue(context)
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if old_state:
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context = EventContext()
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context.prev_state_ids = {
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(s.type, s.state_key): s.event_id for s in old_state
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}
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context.state_group = self.store.get_next_state_group()
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if event.is_state():
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key = (event.type, event.state_key)
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if key in context.prev_state_ids:
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replaces = context.prev_state_ids[key]
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if replaces != event.event_id: # Paranoia check
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event.unsigned["replaces_state"] = replaces
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context.current_state_ids = dict(context.prev_state_ids)
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context.current_state_ids[key] = event.event_id
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else:
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context.current_state_ids = context.prev_state_ids
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context.prev_state_events = []
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defer.returnValue(context)
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logger.debug("calling resolve_state_groups from compute_event_context")
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entry = yield self.resolve_state_groups(
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event.room_id, [e for e, _ in event.prev_events],
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)
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curr_state = entry.state
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context = EventContext()
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context.prev_state_ids = curr_state
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if event.is_state():
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context.state_group = self.store.get_next_state_group()
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key = (event.type, event.state_key)
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if key in context.prev_state_ids:
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replaces = context.prev_state_ids[key]
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event.unsigned["replaces_state"] = replaces
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context.current_state_ids = dict(context.prev_state_ids)
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context.current_state_ids[key] = event.event_id
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if entry.state_group:
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context.prev_group = entry.state_group
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context.delta_ids = {
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key: event.event_id
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}
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elif entry.prev_group:
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context.prev_group = entry.prev_group
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context.delta_ids = dict(entry.delta_ids)
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context.delta_ids[key] = event.event_id
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else:
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if entry.state_group is None:
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entry.state_group = self.store.get_next_state_group()
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entry.state_id = entry.state_group
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context.state_group = entry.state_group
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context.current_state_ids = context.prev_state_ids
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context.prev_group = entry.prev_group
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context.delta_ids = entry.delta_ids
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context.prev_state_events = []
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defer.returnValue(context)
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@defer.inlineCallbacks
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@log_function
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def resolve_state_groups(self, room_id, event_ids):
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""" Given a list of event_ids this method fetches the state at each
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event, resolves conflicts between them and returns them.
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Returns:
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a Deferred tuple of (`state_group`, `state`, `prev_state`).
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`state_group` is the name of a state group if one and only one is
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involved. `state` is a map from (type, state_key) to event, and
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`prev_state` is a list of event ids.
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"""
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logger.debug("resolve_state_groups event_ids %s", event_ids)
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# map from state group id to the state in that state group (where
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# 'state' is a map from state key to event id)
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# dict[int, dict[(str, str), str]]
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state_groups_ids = yield self.store.get_state_groups_ids(
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room_id, event_ids
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)
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logger.debug(
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"resolve_state_groups state_groups %s",
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state_groups_ids.keys()
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)
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group_names = frozenset(state_groups_ids.keys())
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if len(group_names) == 1:
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name, state_list = state_groups_ids.items().pop()
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prev_group, delta_ids = yield self.store.get_state_group_delta(name)
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defer.returnValue(_StateCacheEntry(
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state=state_list,
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state_group=name,
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prev_group=prev_group,
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delta_ids=delta_ids,
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))
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with (yield self.resolve_linearizer.queue(group_names)):
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if self._state_cache is not None:
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cache = self._state_cache.get(group_names, None)
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if cache:
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defer.returnValue(cache)
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logger.info(
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"Resolving state for %s with %d groups", room_id, len(state_groups_ids)
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)
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# build a map from state key to the event_ids which set that state.
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# dict[(str, str), set[str])
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state = {}
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for st in state_groups_ids.values():
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for key, e_id in st.items():
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state.setdefault(key, set()).add(e_id)
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# build a map from state key to the event_ids which set that state,
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# including only those where there are state keys in conflict.
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conflicted_state = {
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k: list(v)
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for k, v in state.items()
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if len(v) > 1
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}
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if conflicted_state:
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logger.info("Resolving conflicted state for %r", room_id)
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with Measure(self.clock, "state._resolve_events"):
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new_state = yield resolve_events_with_factory(
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state_groups_ids.values(),
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state_map_factory=lambda ev_ids: self.store.get_events(
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ev_ids, get_prev_content=False, check_redacted=False,
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),
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)
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else:
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new_state = {
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key: e_ids.pop() for key, e_ids in state.items()
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}
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state_group = None
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new_state_event_ids = frozenset(new_state.values())
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for sg, events in state_groups_ids.items():
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if new_state_event_ids == frozenset(e_id for e_id in events):
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state_group = sg
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break
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# TODO: We want to create a state group for this set of events, to
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# increase cache hits, but we need to make sure that it doesn't
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# end up as a prev_group without being added to the database
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prev_group = None
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delta_ids = None
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for old_group, old_ids in state_groups_ids.iteritems():
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if not set(new_state) - set(old_ids):
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n_delta_ids = {
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k: v
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for k, v in new_state.iteritems()
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if old_ids.get(k) != v
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}
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if not delta_ids or len(n_delta_ids) < len(delta_ids):
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prev_group = old_group
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delta_ids = n_delta_ids
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cache = _StateCacheEntry(
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state=new_state,
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state_group=state_group,
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prev_group=prev_group,
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delta_ids=delta_ids,
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)
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if self._state_cache is not None:
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self._state_cache[group_names] = cache
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defer.returnValue(cache)
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def resolve_events(self, state_sets, event):
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logger.info(
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"Resolving state for %s with %d groups", event.room_id, len(state_sets)
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)
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state_set_ids = [{
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(ev.type, ev.state_key): ev.event_id
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for ev in st
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} for st in state_sets]
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state_map = {
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ev.event_id: ev
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for st in state_sets
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for ev in st
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}
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with Measure(self.clock, "state._resolve_events"):
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new_state = resolve_events_with_state_map(state_set_ids, state_map)
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new_state = {
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key: state_map[ev_id] for key, ev_id in new_state.items()
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}
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return new_state
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def _ordered_events(events):
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def key_func(e):
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return -int(e.depth), hashlib.sha1(e.event_id).hexdigest()
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return sorted(events, key=key_func)
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def resolve_events_with_state_map(state_sets, state_map):
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"""
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Args:
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state_sets(list): List of dicts of (type, state_key) -> event_id,
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which are the different state groups to resolve.
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state_map(dict): a dict from event_id to event, for all events in
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state_sets.
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Returns
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dict[(str, str), synapse.events.FrozenEvent]:
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a map from (type, state_key) to event.
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"""
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if len(state_sets) == 1:
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return state_sets[0]
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unconflicted_state, conflicted_state = _seperate(
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state_sets,
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)
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auth_events = _create_auth_events_from_maps(
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unconflicted_state, conflicted_state, state_map
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)
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return _resolve_with_state(
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unconflicted_state, conflicted_state, auth_events, state_map
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)
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def _seperate(state_sets):
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"""Takes the state_sets and figures out which keys are conflicted and
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which aren't. i.e., which have multiple different event_ids associated
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with them in different state sets.
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"""
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unconflicted_state = dict(state_sets[0])
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conflicted_state = {}
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for state_set in state_sets[1:]:
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for key, value in state_set.iteritems():
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# Check if there is an unconflicted entry for the state key.
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unconflicted_value = unconflicted_state.get(key)
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if unconflicted_value is None:
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# There isn't an unconflicted entry so check if there is a
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# conflicted entry.
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ls = conflicted_state.get(key)
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if ls is None:
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# There wasn't a conflicted entry so haven't seen this key before.
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# Therefore it isn't conflicted yet.
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unconflicted_state[key] = value
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else:
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# This key is already conflicted, add our value to the conflict set.
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ls.add(value)
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elif unconflicted_value != value:
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# If the unconflicted value is not the same as our value then we
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# have a new conflict. So move the key from the unconflicted_state
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# to the conflicted state.
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conflicted_state[key] = {value, unconflicted_value}
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unconflicted_state.pop(key, None)
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return unconflicted_state, conflicted_state
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@defer.inlineCallbacks
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def resolve_events_with_factory(state_sets, state_map_factory):
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"""
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Args:
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state_sets(list): List of dicts of (type, state_key) -> event_id,
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which are the different state groups to resolve.
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state_map_factory(func): will be called
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with a list of event_ids that are needed, and should return with
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a Deferred of dict of event_id to event.
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Returns
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Deferred[dict[(str, str), synapse.events.FrozenEvent]]:
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a map from (type, state_key) to event.
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"""
|
|
if len(state_sets) == 1:
|
|
defer.returnValue(state_sets[0])
|
|
|
|
unconflicted_state, conflicted_state = _seperate(
|
|
state_sets,
|
|
)
|
|
|
|
needed_events = set(
|
|
event_id
|
|
for event_ids in conflicted_state.itervalues()
|
|
for event_id in event_ids
|
|
)
|
|
|
|
logger.info("Asking for %d conflicted events", len(needed_events))
|
|
|
|
# dict[str, FrozenEvent]: a map from state event id to event. Only includes
|
|
# the state events which are in conflict.
|
|
state_map = yield state_map_factory(needed_events)
|
|
|
|
# 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
|
|
)
|
|
|
|
new_needed_events = set(auth_events.itervalues())
|
|
new_needed_events -= needed_events
|
|
|
|
logger.info("Asking for %d auth events", len(new_needed_events))
|
|
|
|
state_map_new = yield state_map_factory(new_needed_events)
|
|
state_map.update(state_map_new)
|
|
|
|
defer.returnValue(_resolve_with_state(
|
|
unconflicted_state, conflicted_state, auth_events, state_map
|
|
))
|
|
|
|
|
|
def _create_auth_events_from_maps(unconflicted_state, conflicted_state, state_map):
|
|
auth_events = {}
|
|
for event_ids in conflicted_state.itervalues():
|
|
for event_id in event_ids:
|
|
if event_id in state_map:
|
|
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
|
|
return auth_events
|
|
|
|
|
|
def _resolve_with_state(unconflicted_state_ids, conflicted_state_ds, auth_event_ids,
|
|
state_map):
|
|
conflicted_state = {}
|
|
for key, event_ids in conflicted_state_ds.iteritems():
|
|
events = [state_map[ev_id] for ev_id in event_ids if ev_id in state_map]
|
|
if len(events) > 1:
|
|
conflicted_state[key] = events
|
|
elif len(events) == 1:
|
|
unconflicted_state_ids[key] = events[0].event_id
|
|
|
|
auth_events = {
|
|
key: state_map[ev_id]
|
|
for key, ev_id in auth_event_ids.items()
|
|
if ev_id in state_map
|
|
}
|
|
|
|
try:
|
|
resolved_state = _resolve_state_events(
|
|
conflicted_state, auth_events
|
|
)
|
|
except Exception:
|
|
logger.exception("Failed to resolve state")
|
|
raise
|
|
|
|
new_state = unconflicted_state_ids
|
|
for key, event in resolved_state.iteritems():
|
|
new_state[key] = event.event_id
|
|
|
|
return new_state
|
|
|
|
|
|
def _resolve_state_events(conflicted_state, auth_events):
|
|
""" This is where we actually decide which of the conflicted state to
|
|
use.
|
|
|
|
We resolve conflicts in the following order:
|
|
1. power levels
|
|
2. join rules
|
|
3. memberships
|
|
4. other events.
|
|
"""
|
|
resolved_state = {}
|
|
if POWER_KEY in conflicted_state:
|
|
events = conflicted_state[POWER_KEY]
|
|
logger.debug("Resolving conflicted power levels %r", events)
|
|
resolved_state[POWER_KEY] = _resolve_auth_events(
|
|
events, auth_events)
|
|
|
|
auth_events.update(resolved_state)
|
|
|
|
for key, events in conflicted_state.items():
|
|
if key[0] == EventTypes.JoinRules:
|
|
logger.debug("Resolving conflicted join rules %r", events)
|
|
resolved_state[key] = _resolve_auth_events(
|
|
events,
|
|
auth_events
|
|
)
|
|
|
|
auth_events.update(resolved_state)
|
|
|
|
for key, events in conflicted_state.items():
|
|
if key[0] == EventTypes.Member:
|
|
logger.debug("Resolving conflicted member lists %r", events)
|
|
resolved_state[key] = _resolve_auth_events(
|
|
events,
|
|
auth_events
|
|
)
|
|
|
|
auth_events.update(resolved_state)
|
|
|
|
for key, events in conflicted_state.items():
|
|
if key not in resolved_state:
|
|
logger.debug("Resolving conflicted state %r:%r", key, events)
|
|
resolved_state[key] = _resolve_normal_events(
|
|
events, auth_events
|
|
)
|
|
|
|
return resolved_state
|
|
|
|
|
|
def _resolve_auth_events(events, auth_events):
|
|
reverse = [i for i in reversed(_ordered_events(events))]
|
|
|
|
auth_keys = set(
|
|
key
|
|
for event in events
|
|
for key in event_auth.auth_types_for_event(event)
|
|
)
|
|
|
|
new_auth_events = {}
|
|
for key in auth_keys:
|
|
auth_event = auth_events.get(key, None)
|
|
if auth_event:
|
|
new_auth_events[key] = auth_event
|
|
|
|
auth_events = new_auth_events
|
|
|
|
prev_event = reverse[0]
|
|
for event in reverse[1:]:
|
|
auth_events[(prev_event.type, prev_event.state_key)] = prev_event
|
|
try:
|
|
# The signatures have already been checked at this point
|
|
event_auth.check(event, auth_events, do_sig_check=False, do_size_check=False)
|
|
prev_event = event
|
|
except AuthError:
|
|
return prev_event
|
|
|
|
return event
|
|
|
|
|
|
def _resolve_normal_events(events, auth_events):
|
|
for event in _ordered_events(events):
|
|
try:
|
|
# The signatures have already been checked at this point
|
|
event_auth.check(event, auth_events, do_sig_check=False, do_size_check=False)
|
|
return event
|
|
except AuthError:
|
|
pass
|
|
|
|
# Use the last event (the one with the least depth) if they all fail
|
|
# the auth check.
|
|
return event
|