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Merge pull request #4040 from matrix-org/erikj/states_res_v2_rebase 

Add v2 state resolution algorithm
This commit is contained in:
Erik Johnston 2018-10-24 11:12:12 +01:00 committed by GitHub
parent e0b9d5f0af b313b9b009
commit 3904cbf307
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 1323 additions and 61 deletions
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1
changelog.d/3786.misc Normal file
View File

@ -0,0 +1 @@
Add initial implementation of new state resolution algorithm

2
synapse/event_auth.py
View File

@ -690,7 +690,7 @@ def auth_types_for_event(event):
auth_types = []
auth_types.append((EventTypes.PowerLevels, "", ))
auth_types.append((EventTypes.Member, event.user_id, ))
auth_types.append((EventTypes.Member, event.sender, ))
auth_types.append((EventTypes.Create, "", ))
if event.type == EventTypes.Member:

30
synapse/handlers/federation.py
View File

@ -53,7 +53,7 @@ from synapse.replication.http.federation import (
ReplicationFederationSendEventsRestServlet,
)
from synapse.replication.http.membership import ReplicationUserJoinedLeftRoomRestServlet
from synapse.state import resolve_events_with_factory
from synapse.state import StateResolutionStore, resolve_events_with_store
from synapse.types import UserID, get_domain_from_id
from synapse.util import logcontext, unwrapFirstError
from synapse.util.async_helpers import Linearizer
@ -384,24 +384,24 @@ class FederationHandler(BaseHandler):
for x in remote_state:
event_map[x.event_id] = x
# Resolve any conflicting state
@defer.inlineCallbacks
def fetch(ev_ids):
fetched = yield self.store.get_events(
ev_ids, get_prev_content=False, check_redacted=False,
)
# add any events we fetch here to the `event_map` so that we
# can use them to build the state event list below.
event_map.update(fetched)
defer.returnValue(fetched)
room_version = yield self.store.get_room_version(room_id)
state_map = yield resolve_events_with_factory(
room_version, state_maps, event_map, fetch,
state_map = yield resolve_events_with_store(
room_version, state_maps, event_map,
state_res_store=StateResolutionStore(self.store),
)
# we need to give _process_received_pdu the actual state events
# We need to give _process_received_pdu the actual state events
# rather than event ids, so generate that now.
# First though we need to fetch all the events that are in
# state_map, so we can build up the state below.
evs = yield self.store.get_events(
list(state_map.values()),
get_prev_content=False,
check_redacted=False,
)
event_map.update(evs)
state = [
event_map[e] for e in six.itervalues(state_map)
]

97
synapse/state/__init__.py
View File

@ -19,13 +19,14 @@ from collections import namedtuple
from six import iteritems, itervalues
import attr
from frozendict import frozendict
from twisted.internet import defer
from synapse.api.constants import EventTypes, RoomVersions
from synapse.events.snapshot import EventContext
from synapse.state import v1
from synapse.state import v1, v2
from synapse.util.async_helpers import Linearizer
from synapse.util.caches import get_cache_factor_for
from synapse.util.caches.expiringcache import ExpiringCache
@ -372,15 +373,10 @@ class StateHandler(object):
result = yield self._state_resolution_handler.resolve_state_groups(
room_id, room_version, state_groups_ids, None,
self._state_map_factory,
state_res_store=StateResolutionStore(self.store),
)
defer.returnValue(result)
def _state_map_factory(self, ev_ids):
return self.store.get_events(
ev_ids, get_prev_content=False, check_redacted=False,
)
@defer.inlineCallbacks
def resolve_events(self, room_version, state_sets, event):
logger.info(
@ -398,10 +394,10 @@ class StateHandler(object):
}
with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_factory(
new_state = yield resolve_events_with_store(
room_version, state_set_ids,
event_map=state_map,
state_map_factory=self._state_map_factory
state_res_store=StateResolutionStore(self.store),
)
new_state = {
@ -436,7 +432,7 @@ class StateResolutionHandler(object):
@defer.inlineCallbacks
@log_function
def resolve_state_groups(
self, room_id, room_version, state_groups_ids, event_map, state_map_factory,
self, room_id, room_version, state_groups_ids, event_map, state_res_store,
):
"""Resolves conflicts between a set of state groups
@ -454,9 +450,11 @@ class StateResolutionHandler(object):
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
events will be requested via state_map_factory.
events will be requested via state_res_store.
If None, all events will be fetched via state_map_factory.
If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore)
Returns:
Deferred[_StateCacheEntry]: resolved state
@ -480,10 +478,10 @@ class StateResolutionHandler(object):
# start by assuming we won't have any conflicted state, and build up the new
# state map by iterating through the state groups. If we discover a conflict,
# we give up and instead use `resolve_events_with_factory`.
# we give up and instead use `resolve_events_with_store`.
#
# XXX: is this actually worthwhile, or should we just let
# resolve_events_with_factory do it?
# resolve_events_with_store do it?
new_state = {}
conflicted_state = False
for st in itervalues(state_groups_ids):
@ -498,11 +496,11 @@ class StateResolutionHandler(object):
if conflicted_state:
logger.info("Resolving conflicted state for %r", room_id)
with Measure(self.clock, "state._resolve_events"):
new_state = yield resolve_events_with_factory(
new_state = yield resolve_events_with_store(
room_version,
list(itervalues(state_groups_ids)),
event_map=event_map,
state_map_factory=state_map_factory,
state_res_store=state_res_store,
)
# if the new state matches any of the input state groups, we can
@ -583,7 +581,7 @@ def _make_state_cache_entry(
)
def resolve_events_with_factory(room_version, state_sets, event_map, state_map_factory):
def resolve_events_with_store(room_version, state_sets, event_map, state_res_store):
"""
Args:
room_version(str): Version of the room
@ -599,17 +597,19 @@ def resolve_events_with_factory(room_version, state_sets, event_map, state_map_f
If None, all events will be fetched via state_map_factory.
state_map_factory(func): will be called
with a list of event_ids that are needed, and should return with
a Deferred of dict of event_id to event.
state_res_store (StateResolutionStore)
Returns
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
"""
if room_version in (RoomVersions.V1, RoomVersions.VDH_TEST,):
return v1.resolve_events_with_factory(
state_sets, event_map, state_map_factory,
if room_version == RoomVersions.V1:
return v1.resolve_events_with_store(
state_sets, event_map, state_res_store.get_events,
)
elif room_version == RoomVersions.VDH_TEST:
return v2.resolve_events_with_store(
state_sets, event_map, state_res_store,
)
else:
# This should only happen if we added a version but forgot to add it to
@ -617,3 +617,54 @@ def resolve_events_with_factory(room_version, state_sets, event_map, state_map_f
raise Exception(
"No state resolution algorithm defined for version %r" % (room_version,)
)
@attr.s
class StateResolutionStore(object):
"""Interface that allows state resolution algorithms to access the database
in well defined way.
Args:
store (DataStore)
"""
store = attr.ib()
def get_events(self, event_ids, allow_rejected=False):
"""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.
Returns:
Deferred[dict[str, FrozenEvent]]: Dict from event_id to event.
"""
return self.store.get_events(
event_ids,
check_redacted=False,
get_prev_content=False,
allow_rejected=allow_rejected,
)
def get_auth_chain(self, event_ids):
"""Gets the full auth chain for a set of events (including rejected
events).
Includes the given event IDs in the result.
Note that:
1. All events must be state events.
2. For v1 rooms this may not have the full auth chain in the
presence of rejected events
Args:
event_ids (list): The event IDs of the events to fetch the auth
chain for. Must be state events.
Returns:
Deferred[list[str]]: List of event IDs of the auth chain.
"""
return self.store.get_auth_chain_ids(event_ids, include_given=True)

2
synapse/state/v1.py
View File

@ -31,7 +31,7 @@ POWER_KEY = (EventTypes.PowerLevels, "")
@defer.inlineCallbacks
def resolve_events_with_factory(state_sets, event_map, state_map_factory):
def resolve_events_with_store(state_sets, event_map, state_map_factory):
"""
Args:
state_sets(list): List of dicts of (type, state_key) -> event_id,

544
synapse/state/v2.py Normal file
View File

@ -0,0 +1,544 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import heapq
import itertools
import logging
from six import iteritems, itervalues
from twisted.internet import defer
from synapse import event_auth
from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError
logger = logging.getLogger(__name__)
@defer.inlineCallbacks
def resolve_events_with_store(state_sets, event_map, state_res_store):
"""Resolves the state using the v2 state resolution algorithm
Args:
state_sets(list): List of dicts of (type, state_key) -> event_id,
which are the different state groups to resolve.
event_map(dict[str,FrozenEvent]|None):
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
events will be requested via state_res_store.
If None, all events will be fetched via state_res_store.
state_res_store (StateResolutionStore)
Returns
Deferred[dict[(str, str), str]]:
a map from (type, state_key) to event_id.
"""
logger.debug("Computing conflicted state")
# First split up the un/conflicted state
unconflicted_state, conflicted_state = _seperate(state_sets)
if not conflicted_state:
defer.returnValue(unconflicted_state)
logger.debug("%d conflicted state entries", len(conflicted_state))
logger.debug("Calculating auth chain difference")
# Also fetch all auth events that appear in only some of the state sets'
# auth chains.
auth_diff = yield _get_auth_chain_difference(
state_sets, event_map, state_res_store,
)
full_conflicted_set = set(itertools.chain(
itertools.chain.from_iterable(itervalues(conflicted_state)),
auth_diff,
))
events = yield state_res_store.get_events([
eid for eid in full_conflicted_set
if eid not in event_map
], allow_rejected=True)
event_map.update(events)
full_conflicted_set = set(eid for eid in full_conflicted_set if eid in event_map)
logger.debug("%d full_conflicted_set entries", len(full_conflicted_set))
# Get and sort all the power events (kicks/bans/etc)
power_events = (
eid for eid in full_conflicted_set
if _is_power_event(event_map[eid])
)
sorted_power_events = yield _reverse_topological_power_sort(
power_events,
event_map,
state_res_store,
full_conflicted_set,
)
logger.debug("sorted %d power events", len(sorted_power_events))
# Now sequentially auth each one
resolved_state = yield _iterative_auth_checks(
sorted_power_events, unconflicted_state, event_map,
state_res_store,
)
logger.debug("resolved power events")
# OK, so we've now resolved the power events. Now sort the remaining
# events using the mainline of the resolved power level.
leftover_events = [
ev_id
for ev_id in full_conflicted_set
if ev_id not in sorted_power_events
]
logger.debug("sorting %d remaining events", len(leftover_events))
pl = resolved_state.get((EventTypes.PowerLevels, ""), None)
leftover_events = yield _mainline_sort(
leftover_events, pl, event_map, state_res_store,
)
logger.debug("resolving remaining events")
resolved_state = yield _iterative_auth_checks(
leftover_events, resolved_state, event_map,
state_res_store,
)
logger.debug("resolved")
# We make sure that unconflicted state always still applies.
resolved_state.update(unconflicted_state)
logger.debug("done")
defer.returnValue(resolved_state)
@defer.inlineCallbacks
def _get_power_level_for_sender(event_id, event_map, state_res_store):
"""Return the power level of the sender of the given event according to
their auth events.
Args:
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
Returns:
Deferred[int]
"""
event = yield _get_event(event_id, event_map, state_res_store)
pl = None
for aid, _ in event.auth_events:
aev = yield _get_event(aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
pl = aev
break
if pl is None:
# Couldn't find power level. Check if they're the creator of the room
for aid, _ in event.auth_events:
aev = yield _get_event(aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.Create, ""):
if aev.content.get("creator") == event.sender:
defer.returnValue(100)
break
defer.returnValue(0)
level = pl.content.get("users", {}).get(event.sender)
if level is None:
level = pl.content.get("users_default", 0)
if level is None:
defer.returnValue(0)
else:
defer.returnValue(int(level))
@defer.inlineCallbacks
def _get_auth_chain_difference(state_sets, event_map, state_res_store):
"""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)
Returns:
Deferred[set[str]]: Set of event IDs
"""
common = set(itervalues(state_sets[0])).intersection(
*(itervalues(s) for s in state_sets[1:])
)
auth_sets = []
for state_set in state_sets:
auth_ids = set(
eid
for key, eid in iteritems(state_set)
if (key[0] in (
EventTypes.Member,
EventTypes.ThirdPartyInvite,
) or key in (
(EventTypes.PowerLevels, ''),
(EventTypes.Create, ''),
(EventTypes.JoinRules, ''),
)) and eid not in common
)
auth_chain = yield state_res_store.get_auth_chain(auth_ids)
auth_ids.update(auth_chain)
auth_sets.append(auth_ids)
intersection = set(auth_sets[0]).intersection(*auth_sets[1:])
union = set().union(*auth_sets)
defer.returnValue(union - intersection)
def _seperate(state_sets):
"""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)
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
"""
unconflicted_state = {}
conflicted_state = {}
for key in set(itertools.chain.from_iterable(state_sets)):
event_ids = set(state_set.get(key) for state_set in state_sets)
if len(event_ids) == 1:
unconflicted_state[key] = event_ids.pop()
else:
event_ids.discard(None)
conflicted_state[key] = event_ids
return unconflicted_state, conflicted_state
def _is_power_event(event):
"""Return whether or not the event is a "power event", as defined by the
v2 state resolution algorithm
Args:
event (FrozenEvent)
Returns:
boolean
"""
if (event.type, event.state_key) in (
(EventTypes.PowerLevels, ""),
(EventTypes.JoinRules, ""),
(EventTypes.Create, ""),
):
return True
if event.type == EventTypes.Member:
if event.membership in ('leave', 'ban'):
return event.sender != event.state_key
return False
@defer.inlineCallbacks
def _add_event_and_auth_chain_to_graph(graph, event_id, event_map,
state_res_store, auth_diff):
"""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
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.
"""
state = [event_id]
while state:
eid = state.pop()
graph.setdefault(eid, set())
event = yield _get_event(eid, event_map, state_res_store)
for aid, _ in event.auth_events:
if aid in auth_diff:
if aid not in graph:
state.append(aid)
graph.setdefault(eid, set()).add(aid)
@defer.inlineCallbacks
def _reverse_topological_power_sort(event_ids, event_map, state_res_store, auth_diff):
"""Returns a list of the event_ids sorted by reverse topological ordering,
and then by power level and origin_server_ts
Args:
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.
Returns:
Deferred[list[str]]: The sorted list
"""
graph = {}
for event_id in event_ids:
yield _add_event_and_auth_chain_to_graph(
graph, event_id, event_map, state_res_store, auth_diff,
)
event_to_pl = {}
for event_id in graph:
pl = yield _get_power_level_for_sender(event_id, event_map, state_res_store)
event_to_pl[event_id] = pl
def _get_power_order(event_id):
ev = event_map[event_id]
pl = event_to_pl[event_id]
return -pl, ev.origin_server_ts, event_id
# Note: graph is modified during the sort
it = lexicographical_topological_sort(
graph,
key=_get_power_order,
)
sorted_events = list(it)
defer.returnValue(sorted_events)
@defer.inlineCallbacks
def _iterative_auth_checks(event_ids, base_state, event_map, state_res_store):
"""Sequentially apply auth checks to each event in given list, updating the
state as it goes along.
Args:
event_ids (list[str]): Ordered list of events to apply auth checks to
base_state (dict[tuple[str, str], str]): The set of state to start with
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
Returns:
Deferred[dict[tuple[str, str], str]]: Returns the final updated state
"""
resolved_state = base_state.copy()
for event_id in event_ids:
event = event_map[event_id]
auth_events = {}
for aid, _ in event.auth_events:
ev = yield _get_event(aid, event_map, state_res_store)
if ev.rejected_reason is None:
auth_events[(ev.type, ev.state_key)] = ev
for key in event_auth.auth_types_for_event(event):
if key in resolved_state:
ev_id = resolved_state[key]
ev = yield _get_event(ev_id, event_map, state_res_store)
if ev.rejected_reason is None:
auth_events[key] = event_map[ev_id]
try:
event_auth.check(
event, auth_events,
do_sig_check=False,
do_size_check=False
)
resolved_state[(event.type, event.state_key)] = event_id
except AuthError:
pass
defer.returnValue(resolved_state)
@defer.inlineCallbacks
def _mainline_sort(event_ids, resolved_power_event_id, event_map,
state_res_store):
"""Returns a sorted list of event_ids sorted by mainline ordering based on
the given event resolved_power_event_id
Args:
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)
Returns:
Deferred[list[str]]: The sorted list
"""
mainline = []
pl = resolved_power_event_id
while pl:
mainline.append(pl)
pl_ev = yield _get_event(pl, event_map, state_res_store)
auth_events = pl_ev.auth_events
pl = None
for aid, _ in auth_events:
ev = yield _get_event(aid, event_map, state_res_store)
if (ev.type, ev.state_key) == (EventTypes.PowerLevels, ""):
pl = aid
break
mainline_map = {ev_id: i + 1 for i, ev_id in enumerate(reversed(mainline))}
event_ids = list(event_ids)
order_map = {}
for ev_id in event_ids:
depth = yield _get_mainline_depth_for_event(
event_map[ev_id], mainline_map,
event_map, state_res_store,
)
order_map[ev_id] = (depth, event_map[ev_id].origin_server_ts, ev_id)
event_ids.sort(key=lambda ev_id: order_map[ev_id])
defer.returnValue(event_ids)
@defer.inlineCallbacks
def _get_mainline_depth_for_event(event, mainline_map, event_map, state_res_store):
"""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)
Returns:
Deferred[int]
"""
# We do an iterative search, replacing `event with the power level in its
# auth events (if any)
while event:
depth = mainline_map.get(event.event_id)
if depth is not None:
defer.returnValue(depth)
auth_events = event.auth_events
event = None
for aid, _ in auth_events:
aev = yield _get_event(aid, event_map, state_res_store)
if (aev.type, aev.state_key) == (EventTypes.PowerLevels, ""):
event = aev
break
# Didn't find a power level auth event, so we just return 0
defer.returnValue(0)
@defer.inlineCallbacks
def _get_event(event_id, event_map, state_res_store):
"""Helper function to look up event in event_map, falling back to looking
it up in the store
Args:
event_id (str)
event_map (dict[str,FrozenEvent])
state_res_store (StateResolutionStore)
Returns:
Deferred[FrozenEvent]
"""
if event_id not in event_map:
events = yield state_res_store.get_events([event_id], allow_rejected=True)
event_map.update(events)
defer.returnValue(event_map[event_id])
def lexicographical_topological_sort(graph, key):
"""Performs a lexicographic reverse topological sort on the graph.
This returns a reverse topological sort (i.e. if node A references B then B
appears before A in the sort), with ties broken lexicographically based on
return value of the `key` function.
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
Yields:
str: 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 = {}
# Lists of nodes with zero out degree. Is actually a tuple of
# `(key(node), node)` so that sorting does the right thing
zero_outdegree = []
for node, edges in iteritems(graph):
if len(edges) == 0:
zero_outdegree.append((key(node), node))
reverse_graph.setdefault(node, set())
for edge in edges:
reverse_graph.setdefault(edge, set()).add(node)
# heapq is a built in implementation of a sorted queue.
heapq.heapify(zero_outdegree)
while zero_outdegree:
_, node = heapq.heappop(zero_outdegree)
for parent in reverse_graph[node]:
out = outdegree_map[parent]
out.discard(node)
if len(out) == 0:
heapq.heappush(zero_outdegree, (key(parent), parent))
yield node

45
synapse/storage/events.py
View File

@ -34,6 +34,7 @@ from synapse.api.errors import SynapseError
from synapse.events import EventBase # noqa: F401
from synapse.events.snapshot import EventContext # noqa: F401
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.state import StateResolutionStore
from synapse.storage.background_updates import BackgroundUpdateStore
from synapse.storage.event_federation import EventFederationStore
from synapse.storage.events_worker import EventsWorkerStore
@ -731,11 +732,6 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
# Ok, we need to defer to the state handler to resolve our state sets.
def get_events(ev_ids):
return self.get_events(
ev_ids, get_prev_content=False, check_redacted=False,
)
state_groups = {
sg: state_groups_map[sg] for sg in new_state_groups
}
@ -745,7 +741,8 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
logger.debug("calling resolve_state_groups from preserve_events")
res = yield self._state_resolution_handler.resolve_state_groups(
room_id, room_version, state_groups, events_map, get_events
room_id, room_version, state_groups, events_map,
state_res_store=StateResolutionStore(self)
)
defer.returnValue((res.state, None))
@ -854,6 +851,27 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
# Insert into event_to_state_groups.
self._store_event_state_mappings_txn(txn, events_and_contexts)
# We want to store event_auth mappings for rejected events, as they're
# used in state res v2.
# This is only necessary if the rejected event appears in an accepted
# event's auth chain, but its easier for now just to store them (and
# it doesn't take much storage compared to storing the entire event
# anyway).
self._simple_insert_many_txn(
txn,
table="event_auth",
values=[
{
"event_id": event.event_id,
"room_id": event.room_id,
"auth_id": auth_id,
}
for event, _ in events_and_contexts
for auth_id, _ in event.auth_events
if event.is_state()
],
)
# _store_rejected_events_txn filters out any events which were
# rejected, and returns the filtered list.
events_and_contexts = self._store_rejected_events_txn(
@ -1329,21 +1347,6 @@ class EventsStore(EventFederationStore, EventsWorkerStore, BackgroundUpdateStore
txn, event.room_id, event.redacts
)
self._simple_insert_many_txn(
txn,
table="event_auth",
values=[
{
"event_id": event.event_id,
"room_id": event.room_id,
"auth_id": auth_id,
}
for event, _ in events_and_contexts
for auth_id, _ in event.auth_events
if event.is_state()
],
)
# Update the event_forward_extremities, event_backward_extremities and
# event_edges tables.
self._handle_mult_prev_events(

0
tests/state/__init__.py Normal file
View File

663
tests/state/test_v2.py Normal file
View File

@ -0,0 +1,663 @@
# -*- coding: utf-8 -*-
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
from six.moves import zip
import attr
from synapse.api.constants import EventTypes, JoinRules, Membership
from synapse.event_auth import auth_types_for_event
from synapse.events import FrozenEvent
from synapse.state.v2 import lexicographical_topological_sort, resolve_events_with_store
from synapse.types import EventID
from tests import unittest
ALICE = "@alice:example.com"
BOB = "@bob:example.com"
CHARLIE = "@charlie:example.com"
EVELYN = "@evelyn:example.com"
ZARA = "@zara:example.com"
ROOM_ID = "!test:example.com"
MEMBERSHIP_CONTENT_JOIN = {"membership": Membership.JOIN}
MEMBERSHIP_CONTENT_BAN = {"membership": Membership.BAN}
ORIGIN_SERVER_TS = 0
class FakeEvent(object):
"""A fake event we use as a convenience.
NOTE: Again as a convenience we use "node_ids" rather than event_ids to
refer to events. The event_id has node_id as localpart and example.com
as domain.
"""
def __init__(self, id, sender, type, state_key, content):
self.node_id = id
self.event_id = EventID(id, "example.com").to_string()
self.sender = sender
self.type = type
self.state_key = state_key
self.content = content
def to_event(self, auth_events, prev_events):
"""Given the auth_events and prev_events, convert to a Frozen Event
Args:
auth_events (list[str]): list of event_ids
prev_events (list[str]): list of event_ids
Returns:
FrozenEvent
"""
global ORIGIN_SERVER_TS
ts = ORIGIN_SERVER_TS
ORIGIN_SERVER_TS = ORIGIN_SERVER_TS + 1
event_dict = {
"auth_events": [(a, {}) for a in auth_events],
"prev_events": [(p, {}) for p in prev_events],
"event_id": self.node_id,
"sender": self.sender,
"type": self.type,
"content": self.content,
"origin_server_ts": ts,
"room_id": ROOM_ID,
}
if self.state_key is not None:
event_dict["state_key"] = self.state_key
return FrozenEvent(event_dict)
# All graphs start with this set of events
INITIAL_EVENTS = [
FakeEvent(
id="CREATE",
sender=ALICE,
type=EventTypes.Create,
state_key="",
content={"creator": ALICE},
),
FakeEvent(
id="IMA",
sender=ALICE,
type=EventTypes.Member,
state_key=ALICE,
content=MEMBERSHIP_CONTENT_JOIN,
),
FakeEvent(
id="IPOWER",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key="",
content={"users": {ALICE: 100}},
),
FakeEvent(
id="IJR",
sender=ALICE,
type=EventTypes.JoinRules,
state_key="",
content={"join_rule": JoinRules.PUBLIC},
),
FakeEvent(
id="IMB",
sender=BOB,
type=EventTypes.Member,
state_key=BOB,
content=MEMBERSHIP_CONTENT_JOIN,
),
FakeEvent(
id="IMC",
sender=CHARLIE,
type=EventTypes.Member,
state_key=CHARLIE,
content=MEMBERSHIP_CONTENT_JOIN,
),
FakeEvent(
id="IMZ",
sender=ZARA,
type=EventTypes.Member,
state_key=ZARA,
content=MEMBERSHIP_CONTENT_JOIN,
),
FakeEvent(
id="START",
sender=ZARA,
type=EventTypes.Message,
state_key=None,
content={},
),
FakeEvent(
id="END",
sender=ZARA,
type=EventTypes.Message,
state_key=None,
content={},
),
]
INITIAL_EDGES = [
"START", "IMZ", "IMC", "IMB", "IJR", "IPOWER", "IMA", "CREATE",
]
class StateTestCase(unittest.TestCase):
def test_ban_vs_pl(self):
events = [
FakeEvent(
id="PA",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key="",
content={
"users": {
ALICE: 100,
BOB: 50,
}
},
),
FakeEvent(
id="MA",
sender=ALICE,
type=EventTypes.Member,
state_key=ALICE,
content={"membership": Membership.JOIN},
),
FakeEvent(
id="MB",
sender=ALICE,
type=EventTypes.Member,
state_key=BOB,
content={"membership": Membership.BAN},
),
FakeEvent(
id="PB",
sender=BOB,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
]
edges = [
["END", "MB", "MA", "PA", "START"],
["END", "PB", "PA"],
]
expected_state_ids = ["PA", "MA", "MB"]
self.do_check(events, edges, expected_state_ids)
def test_join_rule_evasion(self):
events = [
FakeEvent(
id="JR",
sender=ALICE,
type=EventTypes.JoinRules,
state_key="",
content={"join_rules": JoinRules.PRIVATE},
),
FakeEvent(
id="ME",
sender=EVELYN,
type=EventTypes.Member,
state_key=EVELYN,
content={"membership": Membership.JOIN},
),
]
edges = [
["END", "JR", "START"],
["END", "ME", "START"],
]
expected_state_ids = ["JR"]
self.do_check(events, edges, expected_state_ids)
def test_offtopic_pl(self):
events = [
FakeEvent(
id="PA",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key="",
content={
"users": {
ALICE: 100,
BOB: 50,
}
},
),
FakeEvent(
id="PB",
sender=BOB,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
CHARLIE: 50,
},
},
),
FakeEvent(
id="PC",
sender=CHARLIE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
CHARLIE: 0,
},
},
),
]
edges = [
["END", "PC", "PB", "PA", "START"],
["END", "PA"],
]
expected_state_ids = ["PC"]
self.do_check(events, edges, expected_state_ids)
def test_topic_basic(self):
events = [
FakeEvent(
id="T1",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="PA1",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
FakeEvent(
id="T2",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="PA2",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 0,
},
},
),
FakeEvent(
id="PB",
sender=BOB,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
FakeEvent(
id="T3",
sender=BOB,
type=EventTypes.Topic,
state_key="",
content={},
),
]
edges = [
["END", "PA2", "T2", "PA1", "T1", "START"],
["END", "T3", "PB", "PA1"],
]
expected_state_ids = ["PA2", "T2"]
self.do_check(events, edges, expected_state_ids)
def test_topic_reset(self):
events = [
FakeEvent(
id="T1",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="PA",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
FakeEvent(
id="T2",
sender=BOB,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="MB",
sender=ALICE,
type=EventTypes.Member,
state_key=BOB,
content={"membership": Membership.BAN},
),
]
edges = [
["END", "MB", "T2", "PA", "T1", "START"],
["END", "T1"],
]
expected_state_ids = ["T1", "MB", "PA"]
self.do_check(events, edges, expected_state_ids)
def test_topic(self):
events = [
FakeEvent(
id="T1",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="PA1",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
FakeEvent(
id="T2",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="PA2",
sender=ALICE,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 0,
},
},
),
FakeEvent(
id="PB",
sender=BOB,
type=EventTypes.PowerLevels,
state_key='',
content={
"users": {
ALICE: 100,
BOB: 50,
},
},
),
FakeEvent(
id="T3",
sender=BOB,
type=EventTypes.Topic,
state_key="",
content={},
),
FakeEvent(
id="MZ1",
sender=ZARA,
type=EventTypes.Message,
state_key=None,
content={},
),
FakeEvent(
id="T4",
sender=ALICE,
type=EventTypes.Topic,
state_key="",
content={},
),
]
edges = [
["END", "T4", "MZ1", "PA2", "T2", "PA1", "T1", "START"],
["END", "MZ1", "T3", "PB", "PA1"],
]
expected_state_ids = ["T4", "PA2"]
self.do_check(events, edges, expected_state_ids)
def do_check(self, events, edges, expected_state_ids):
"""Take a list of events and edges and calculate the state of the
graph at END, and asserts it matches `expected_state_ids`
Args:
events (list[FakeEvent])
edges (list[list[str]]): A list of chains of event edges, e.g.
`[[A, B, C]]` are edges A->B and B->C.
expected_state_ids (list[str]): The expected state at END, (excluding
the keys that haven't changed since START).
"""
# We want to sort the events into topological order for processing.
graph = {}
# node_id -> FakeEvent
fake_event_map = {}
for ev in itertools.chain(INITIAL_EVENTS, events):
graph[ev.node_id] = set()
fake_event_map[ev.node_id] = ev
for a, b in pairwise(INITIAL_EDGES):
graph[a].add(b)
for edge_list in edges:
for a, b in pairwise(edge_list):
graph[a].add(b)
# event_id -> FrozenEvent
event_map = {}
# node_id -> state
state_at_event = {}
# We copy the map as the sort consumes the graph
graph_copy = {k: set(v) for k, v in graph.items()}
for node_id in lexicographical_topological_sort(graph_copy, key=lambda e: e):
fake_event = fake_event_map[node_id]
event_id = fake_event.event_id
prev_events = list(graph[node_id])
if len(prev_events) == 0:
state_before = {}
elif len(prev_events) == 1:
state_before = dict(state_at_event[prev_events[0]])
else:
state_d = resolve_events_with_store(
[state_at_event[n] for n in prev_events],
event_map=event_map,
state_res_store=TestStateResolutionStore(event_map),
)
self.assertTrue(state_d.called)
state_before = state_d.result
state_after = dict(state_before)
if fake_event.state_key is not None:
state_after[(fake_event.type, fake_event.state_key)] = event_id
auth_types = set(auth_types_for_event(fake_event))
auth_events = []
for key in auth_types:
if key in state_before:
auth_events.append(state_before[key])
event = fake_event.to_event(auth_events, prev_events)
state_at_event[node_id] = state_after
event_map[event_id] = event
expected_state = {}
for node_id in expected_state_ids:
# expected_state_ids are node IDs rather than event IDs,
# so we have to convert
event_id = EventID(node_id, "example.com").to_string()
event = event_map[event_id]
key = (event.type, event.state_key)
expected_state[key] = event_id
start_state = state_at_event["START"]
end_state = {
key: value
for key, value in state_at_event["END"].items()
if key in expected_state or start_state.get(key) != value
}
self.assertEqual(expected_state, end_state)
class LexicographicalTestCase(unittest.TestCase):
def test_simple(self):
graph = {
"l": {"o"},
"m": {"n", "o"},
"n": {"o"},
"o": set(),
"p": {"o"},
}
res = list(lexicographical_topological_sort(graph, key=lambda x: x))
self.assertEqual(["o", "l", "n", "m", "p"], res)
def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2, s3), ..."
a, b = itertools.tee(iterable)
next(b, None)
return zip(a, b)
@attr.s
class TestStateResolutionStore(object):
event_map = attr.ib()
def get_events(self, event_ids, allow_rejected=False):
"""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.
Returns:
Deferred[dict[str, FrozenEvent]]: Dict from event_id to event.
"""
return {
eid: self.event_map[eid]
for eid in event_ids
if eid in self.event_map
}
def get_auth_chain(self, event_ids):
"""Gets the full auth chain for a set of events (including rejected
events).
Includes the given event IDs in the result.
Note that:
1. All events must be state events.
2. For v1 rooms this may not have the full auth chain in the
presence of rejected events
Args:
event_ids (list): The event IDs of the events to fetch the auth
chain for. Must be state events.
Returns:
Deferred[list[str]]: List of event IDs of the auth chain.
"""
# Simple DFS for auth chain
result = set()
stack = list(event_ids)
while stack:
event_id = stack.pop()
if event_id in result:
continue
result.add(event_id)
event = self.event_map[event_id]
for aid, _ in event.auth_events:
stack.append(aid)
return list(result)