Refactor state module
We split out the actual state resolution algorithm to prepare for having multiple versions.
This commit is contained in:
Erik Johnston
parent
0ad98e38d0
commit
119451dcd1
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@ -1,5 +1,6 @@
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# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector 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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@ -13,20 +14,16 @@
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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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import hashlib
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import logging
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from collections import namedtuple
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from six import iteritems, iterkeys, itervalues
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from six import iteritems, itervalues
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from frozendict import frozendict
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from twisted.internet import defer
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from synapse import event_auth
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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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@ -34,6 +31,8 @@ from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.logutils import log_function
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from synapse.util.metrics import Measure
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from .v1 import resolve_events_with_factory, resolve_events_with_state_map
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logger = logging.getLogger(__name__)
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@ -573,294 +572,3 @@ def _make_state_cache_entry(
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prev_group=prev_group,
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delta_ids=delta_ids,
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)
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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.encode('ascii')).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), str]:
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a map from (type, state_key) to event_id.
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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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Args:
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state_sets(iterable[dict[(str, str), str]]):
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List of dicts of (type, state_key) -> event_id, which are the
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different state groups to resolve.
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Returns:
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(dict[(str, str), str], dict[(str, str), set[str]]):
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A tuple of (unconflicted_state, conflicted_state), where:
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unconflicted_state is a dict mapping (type, state_key)->event_id
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for unconflicted state keys.
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conflicted_state is a dict mapping (type, state_key) to a set of
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event ids for conflicted state keys.
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"""
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state_set_iterator = iter(state_sets)
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unconflicted_state = dict(next(state_set_iterator))
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conflicted_state = {}
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for state_set in state_set_iterator:
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for key, value in iteritems(state_set):
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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, event_map, 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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event_map(dict[str,FrozenEvent]|None):
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a dict from event_id to event, for any events that we happen to
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have in flight (eg, those currently being persisted). This will be
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used as a starting point fof finding the state we need; any missing
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events will be requested via state_map_factory.
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If None, all events will be fetched via state_map_factory.
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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), str]]:
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a map from (type, state_key) to event_id.
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"""
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if len(state_sets) == 1:
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defer.returnValue(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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needed_events = set(
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event_id
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for event_ids in itervalues(conflicted_state)
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for event_id in event_ids
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)
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if event_map is not None:
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needed_events -= set(iterkeys(event_map))
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logger.info("Asking for %d conflicted events", len(needed_events))
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# dict[str, FrozenEvent]: a map from state event id to event. Only includes
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# the state events which are in conflict (and those in event_map)
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state_map = yield state_map_factory(needed_events)
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if event_map is not None:
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state_map.update(event_map)
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# get the ids of the auth events which allow us to authenticate the
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# conflicted state, picking only from the unconflicting state.
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#
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# dict[(str, str), str]: a map from state key to event id
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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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new_needed_events = set(itervalues(auth_events))
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new_needed_events -= needed_events
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if event_map is not None:
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new_needed_events -= set(iterkeys(event_map))
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logger.info("Asking for %d auth events", len(new_needed_events))
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state_map_new = yield state_map_factory(new_needed_events)
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state_map.update(state_map_new)
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defer.returnValue(_resolve_with_state(
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unconflicted_state, conflicted_state, auth_events, state_map
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))
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def _create_auth_events_from_maps(unconflicted_state, conflicted_state, state_map):
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auth_events = {}
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for event_ids in itervalues(conflicted_state):
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for event_id in event_ids:
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if event_id in state_map:
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keys = event_auth.auth_types_for_event(state_map[event_id])
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for key in keys:
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if key not in auth_events:
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event_id = unconflicted_state.get(key, None)
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if event_id:
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auth_events[key] = event_id
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return auth_events
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def _resolve_with_state(unconflicted_state_ids, conflicted_state_ids, auth_event_ids,
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state_map):
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conflicted_state = {}
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for key, event_ids in iteritems(conflicted_state_ids):
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events = [state_map[ev_id] for ev_id in event_ids if ev_id in state_map]
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if len(events) > 1:
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conflicted_state[key] = events
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elif len(events) == 1:
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unconflicted_state_ids[key] = events[0].event_id
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auth_events = {
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key: state_map[ev_id]
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for key, ev_id in iteritems(auth_event_ids)
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if ev_id in state_map
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}
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try:
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resolved_state = _resolve_state_events(
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conflicted_state, auth_events
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)
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except Exception:
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logger.exception("Failed to resolve state")
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raise
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new_state = unconflicted_state_ids
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for key, event in iteritems(resolved_state):
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new_state[key] = event.event_id
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return new_state
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def _resolve_state_events(conflicted_state, auth_events):
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""" This is where we actually decide which of the conflicted state to
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use.
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We resolve conflicts in the following order:
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1. power levels
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2. join rules
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3. memberships
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4. other events.
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"""
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resolved_state = {}
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if POWER_KEY in conflicted_state:
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events = conflicted_state[POWER_KEY]
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logger.debug("Resolving conflicted power levels %r", events)
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resolved_state[POWER_KEY] = _resolve_auth_events(
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events, auth_events)
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auth_events.update(resolved_state)
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for key, events in iteritems(conflicted_state):
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if key[0] == EventTypes.JoinRules:
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logger.debug("Resolving conflicted join rules %r", events)
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resolved_state[key] = _resolve_auth_events(
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events,
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auth_events
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)
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auth_events.update(resolved_state)
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for key, events in iteritems(conflicted_state):
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if key[0] == EventTypes.Member:
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logger.debug("Resolving conflicted member lists %r", events)
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resolved_state[key] = _resolve_auth_events(
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events,
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auth_events
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)
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auth_events.update(resolved_state)
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for key, events in iteritems(conflicted_state):
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if key not in resolved_state:
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logger.debug("Resolving conflicted state %r:%r", key, events)
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resolved_state[key] = _resolve_normal_events(
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events, auth_events
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)
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return resolved_state
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def _resolve_auth_events(events, auth_events):
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reverse = [i for i in reversed(_ordered_events(events))]
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auth_keys = set(
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key
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for event in events
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for key in event_auth.auth_types_for_event(event)
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)
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new_auth_events = {}
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for key in auth_keys:
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auth_event = auth_events.get(key, None)
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if auth_event:
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new_auth_events[key] = auth_event
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auth_events = new_auth_events
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prev_event = reverse[0]
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for event in reverse[1:]:
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auth_events[(prev_event.type, prev_event.state_key)] = prev_event
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try:
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# The signatures have already been checked at this point
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event_auth.check(event, auth_events, do_sig_check=False, do_size_check=False)
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prev_event = event
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except AuthError:
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return prev_event
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return event
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def _resolve_normal_events(events, auth_events):
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for event in _ordered_events(events):
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try:
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# The signatures have already been checked at this point
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event_auth.check(event, auth_events, do_sig_check=False, do_size_check=False)
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return event
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except AuthError:
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pass
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# Use the last event (the one with the least depth) if they all fail
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# the auth check.
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return event
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@ -0,0 +1,321 @@
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# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector 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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import hashlib
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import logging
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from six import iteritems, iterkeys, itervalues
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from twisted.internet import defer
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from synapse import event_auth
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from synapse.api.constants import EventTypes
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from synapse.api.errors import AuthError
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logger = logging.getLogger(__name__)
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POWER_KEY = (EventTypes.PowerLevels, "")
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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), str]:
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a map from (type, state_key) to event_id.
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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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@defer.inlineCallbacks
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def resolve_events_with_factory(state_sets, event_map, 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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event_map(dict[str,FrozenEvent]|None):
|
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a dict from event_id to event, for any events that we happen to
|
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have in flight (eg, those currently being persisted). This will be
|
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used as a starting point fof finding the state we need; any missing
|
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events will be requested via state_map_factory.
|
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|
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If None, all events will be fetched via state_map_factory.
|
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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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|
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Returns
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Deferred[dict[(str, str), str]]:
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a map from (type, state_key) to event_id.
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"""
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if len(state_sets) == 1:
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defer.returnValue(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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needed_events = set(
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event_id
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for event_ids in itervalues(conflicted_state)
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for event_id in event_ids
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)
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if event_map is not None:
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needed_events -= set(iterkeys(event_map))
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logger.info("Asking for %d conflicted events", len(needed_events))
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# dict[str, FrozenEvent]: a map from state event id to event. Only includes
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# the state events which are in conflict (and those in event_map)
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state_map = yield state_map_factory(needed_events)
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if event_map is not None:
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state_map.update(event_map)
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# get the ids of the auth events which allow us to authenticate the
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# conflicted state, picking only from the unconflicting state.
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#
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# dict[(str, str), str]: a map from state key to event id
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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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new_needed_events = set(itervalues(auth_events))
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new_needed_events -= needed_events
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if event_map is not None:
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new_needed_events -= set(iterkeys(event_map))
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logger.info("Asking for %d auth events", len(new_needed_events))
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state_map_new = yield state_map_factory(new_needed_events)
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state_map.update(state_map_new)
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defer.returnValue(_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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Args:
|
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state_sets(iterable[dict[(str, str), str]]):
|
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List of dicts of (type, state_key) -> event_id, which are the
|
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different state groups to resolve.
|
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|
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Returns:
|
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(dict[(str, str), str], dict[(str, str), set[str]]):
|
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A tuple of (unconflicted_state, conflicted_state), where:
|
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|
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unconflicted_state is a dict mapping (type, state_key)->event_id
|
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for unconflicted state keys.
|
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|
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conflicted_state is a dict mapping (type, state_key) to a set of
|
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event ids for conflicted state keys.
|
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"""
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state_set_iterator = iter(state_sets)
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unconflicted_state = dict(next(state_set_iterator))
|
||||
conflicted_state = {}
|
||||
|
||||
for state_set in state_set_iterator:
|
||||
for key, value in iteritems(state_set):
|
||||
# Check if there is an unconflicted entry for the state key.
|
||||
unconflicted_value = unconflicted_state.get(key)
|
||||
if unconflicted_value is None:
|
||||
# There isn't an unconflicted entry so check if there is a
|
||||
# conflicted entry.
|
||||
ls = conflicted_state.get(key)
|
||||
if ls is None:
|
||||
# There wasn't a conflicted entry so haven't seen this key before.
|
||||
# Therefore it isn't conflicted yet.
|
||||
unconflicted_state[key] = value
|
||||
else:
|
||||
# This key is already conflicted, add our value to the conflict set.
|
||||
ls.add(value)
|
||||
elif unconflicted_value != value:
|
||||
# If the unconflicted value is not the same as our value then we
|
||||
# have a new conflict. So move the key from the unconflicted_state
|
||||
# to the conflicted state.
|
||||
conflicted_state[key] = {value, unconflicted_value}
|
||||
unconflicted_state.pop(key, None)
|
||||
|
||||
return unconflicted_state, conflicted_state
|
||||
|
||||
|
||||
def _create_auth_events_from_maps(unconflicted_state, conflicted_state, state_map):
|
||||
auth_events = {}
|
||||
for event_ids in itervalues(conflicted_state):
|
||||
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_ids, auth_event_ids,
|
||||
state_map):
|
||||
conflicted_state = {}
|
||||
for key, event_ids in iteritems(conflicted_state_ids):
|
||||
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 iteritems(auth_event_ids)
|
||||
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 iteritems(resolved_state):
|
||||
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 iteritems(conflicted_state):
|
||||
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 iteritems(conflicted_state):
|
||||
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 iteritems(conflicted_state):
|
||||
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
|
||||
|
||||
|
||||
def _ordered_events(events):
|
||||
def key_func(e):
|
||||
return -int(e.depth), hashlib.sha1(e.event_id.encode('ascii')).hexdigest()
|
||||
|
||||
return sorted(events, key=key_func)
|
||||
Loading…
Reference in New Issue