651 lines
22 KiB
Python
651 lines
22 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket 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.
|
|
|
|
|
|
from twisted.internet import defer
|
|
|
|
from synapse import event_auth
|
|
from synapse.util.logutils import log_function
|
|
from synapse.util.caches.expiringcache import ExpiringCache
|
|
from synapse.util.metrics import Measure
|
|
from synapse.api.constants import EventTypes
|
|
from synapse.api.errors import AuthError
|
|
from synapse.events.snapshot import EventContext
|
|
from synapse.util.async import Linearizer
|
|
|
|
from collections import namedtuple
|
|
from frozendict import frozendict
|
|
|
|
import logging
|
|
import hashlib
|
|
import os
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
KeyStateTuple = namedtuple("KeyStateTuple", ("context", "type", "state_key"))
|
|
|
|
|
|
CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
|
|
|
|
|
|
SIZE_OF_CACHE = int(100000 * CACHE_SIZE_FACTOR)
|
|
EVICTION_TIMEOUT_SECONDS = 60 * 60
|
|
|
|
|
|
_NEXT_STATE_ID = 1
|
|
|
|
POWER_KEY = (EventTypes.PowerLevels, "")
|
|
|
|
|
|
def _gen_state_id():
|
|
global _NEXT_STATE_ID
|
|
s = "X%d" % (_NEXT_STATE_ID,)
|
|
_NEXT_STATE_ID += 1
|
|
return s
|
|
|
|
|
|
class _StateCacheEntry(object):
|
|
__slots__ = ["state", "state_group", "state_id", "prev_group", "delta_ids"]
|
|
|
|
def __init__(self, state, state_group, prev_group=None, delta_ids=None):
|
|
self.state = frozendict(state)
|
|
self.state_group = state_group
|
|
|
|
self.prev_group = prev_group
|
|
self.delta_ids = frozendict(delta_ids) if delta_ids is not None else None
|
|
|
|
# The `state_id` is a unique ID we generate that can be used as ID for
|
|
# this collection of state. Usually this would be the same as the
|
|
# state group, but on worker instances we can't generate a new state
|
|
# group each time we resolve state, so we generate a separate one that
|
|
# isn't persisted and is used solely for caches.
|
|
# `state_id` is either a state_group (and so an int) or a string. This
|
|
# ensures we don't accidentally persist a state_id as a stateg_group
|
|
if state_group:
|
|
self.state_id = state_group
|
|
else:
|
|
self.state_id = _gen_state_id()
|
|
|
|
def __len__(self):
|
|
return len(self.state)
|
|
|
|
|
|
class StateHandler(object):
|
|
""" Responsible for doing state conflict resolution.
|
|
"""
|
|
|
|
def __init__(self, hs):
|
|
self.clock = hs.get_clock()
|
|
self.store = hs.get_datastore()
|
|
self.hs = hs
|
|
|
|
# dict of set of event_ids -> _StateCacheEntry.
|
|
self._state_cache = None
|
|
self.resolve_linearizer = Linearizer(name="state_resolve_lock")
|
|
|
|
def start_caching(self):
|
|
logger.debug("start_caching")
|
|
|
|
self._state_cache = ExpiringCache(
|
|
cache_name="state_cache",
|
|
clock=self.clock,
|
|
max_len=SIZE_OF_CACHE,
|
|
expiry_ms=EVICTION_TIMEOUT_SECONDS * 1000,
|
|
iterable=True,
|
|
reset_expiry_on_get=True,
|
|
)
|
|
|
|
self._state_cache.start()
|
|
|
|
@defer.inlineCallbacks
|
|
def get_current_state(self, room_id, event_type=None, state_key="",
|
|
latest_event_ids=None):
|
|
""" Retrieves the current state for the room. This is done by
|
|
calling `get_latest_events_in_room` to get the leading edges of the
|
|
event graph and then resolving any of the state conflicts.
|
|
|
|
This is equivalent to getting the state of an event that were to send
|
|
next before receiving any new events.
|
|
|
|
If `event_type` is specified, then the method returns only the one
|
|
event (or None) with that `event_type` and `state_key`.
|
|
|
|
Returns:
|
|
map from (type, state_key) to event
|
|
"""
|
|
if not latest_event_ids:
|
|
latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
|
|
|
|
logger.debug("calling resolve_state_groups from get_current_state")
|
|
ret = yield self.resolve_state_groups(room_id, latest_event_ids)
|
|
state = ret.state
|
|
|
|
if event_type:
|
|
event_id = state.get((event_type, state_key))
|
|
event = None
|
|
if event_id:
|
|
event = yield self.store.get_event(event_id, allow_none=True)
|
|
defer.returnValue(event)
|
|
return
|
|
|
|
state_map = yield self.store.get_events(state.values(), get_prev_content=False)
|
|
state = {
|
|
key: state_map[e_id] for key, e_id in state.items() if e_id in state_map
|
|
}
|
|
|
|
defer.returnValue(state)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_current_state_ids(self, room_id, event_type=None, state_key="",
|
|
latest_event_ids=None):
|
|
if not latest_event_ids:
|
|
latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
|
|
|
|
logger.debug("calling resolve_state_groups from get_current_state_ids")
|
|
ret = yield self.resolve_state_groups(room_id, latest_event_ids)
|
|
state = ret.state
|
|
|
|
if event_type:
|
|
defer.returnValue(state.get((event_type, state_key)))
|
|
return
|
|
|
|
defer.returnValue(state)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_current_user_in_room(self, room_id, latest_event_ids=None):
|
|
if not latest_event_ids:
|
|
latest_event_ids = yield self.store.get_latest_event_ids_in_room(room_id)
|
|
logger.debug("calling resolve_state_groups from get_current_user_in_room")
|
|
entry = yield self.resolve_state_groups(room_id, latest_event_ids)
|
|
joined_users = yield self.store.get_joined_users_from_state(
|
|
room_id, entry.state_id, entry.state
|
|
)
|
|
defer.returnValue(joined_users)
|
|
|
|
@defer.inlineCallbacks
|
|
def compute_event_context(self, event, old_state=None):
|
|
""" Fills out the context with the `current state` of the graph. The
|
|
`current state` here is defined to be the state of the event graph
|
|
just before the event - i.e. it never includes `event`
|
|
|
|
If `event` has `auth_events` then this will also fill out the
|
|
`auth_events` field on `context` from the `current_state`.
|
|
|
|
Args:
|
|
event (EventBase)
|
|
Returns:
|
|
an EventContext
|
|
"""
|
|
context = EventContext()
|
|
|
|
if event.internal_metadata.is_outlier():
|
|
# If this is an outlier, then we know it shouldn't have any current
|
|
# state. Certainly store.get_current_state won't return any, and
|
|
# persisting the event won't store the state group.
|
|
if old_state:
|
|
context.prev_state_ids = {
|
|
(s.type, s.state_key): s.event_id for s in old_state
|
|
}
|
|
if event.is_state():
|
|
context.current_state_events = dict(context.prev_state_ids)
|
|
key = (event.type, event.state_key)
|
|
context.current_state_events[key] = event.event_id
|
|
else:
|
|
context.current_state_events = context.prev_state_ids
|
|
else:
|
|
context.current_state_ids = {}
|
|
context.prev_state_ids = {}
|
|
context.prev_state_events = []
|
|
context.state_group = self.store.get_next_state_group()
|
|
defer.returnValue(context)
|
|
|
|
if old_state:
|
|
context.prev_state_ids = {
|
|
(s.type, s.state_key): s.event_id for s in old_state
|
|
}
|
|
context.state_group = self.store.get_next_state_group()
|
|
|
|
if event.is_state():
|
|
key = (event.type, event.state_key)
|
|
if key in context.prev_state_ids:
|
|
replaces = context.prev_state_ids[key]
|
|
if replaces != event.event_id: # Paranoia check
|
|
event.unsigned["replaces_state"] = replaces
|
|
context.current_state_ids = dict(context.prev_state_ids)
|
|
context.current_state_ids[key] = event.event_id
|
|
else:
|
|
context.current_state_ids = context.prev_state_ids
|
|
|
|
context.prev_state_events = []
|
|
defer.returnValue(context)
|
|
|
|
logger.debug("calling resolve_state_groups from compute_event_context")
|
|
if event.is_state():
|
|
entry = yield self.resolve_state_groups(
|
|
event.room_id, [e for e, _ in event.prev_events],
|
|
event_type=event.type,
|
|
state_key=event.state_key,
|
|
)
|
|
else:
|
|
entry = yield self.resolve_state_groups(
|
|
event.room_id, [e for e, _ in event.prev_events],
|
|
)
|
|
|
|
curr_state = entry.state
|
|
|
|
context.prev_state_ids = curr_state
|
|
if event.is_state():
|
|
context.state_group = self.store.get_next_state_group()
|
|
|
|
key = (event.type, event.state_key)
|
|
if key in context.prev_state_ids:
|
|
replaces = context.prev_state_ids[key]
|
|
event.unsigned["replaces_state"] = replaces
|
|
|
|
context.current_state_ids = dict(context.prev_state_ids)
|
|
context.current_state_ids[key] = event.event_id
|
|
|
|
context.prev_group = entry.prev_group
|
|
context.delta_ids = entry.delta_ids
|
|
if context.delta_ids is not None:
|
|
context.delta_ids = dict(context.delta_ids)
|
|
context.delta_ids[key] = event.event_id
|
|
else:
|
|
if entry.state_group is None:
|
|
entry.state_group = self.store.get_next_state_group()
|
|
entry.state_id = entry.state_group
|
|
|
|
context.state_group = entry.state_group
|
|
context.current_state_ids = context.prev_state_ids
|
|
context.prev_group = entry.prev_group
|
|
context.delta_ids = entry.delta_ids
|
|
|
|
context.prev_state_events = []
|
|
defer.returnValue(context)
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def resolve_state_groups(self, room_id, event_ids, event_type=None, state_key=""):
|
|
""" Given a list of event_ids this method fetches the state at each
|
|
event, resolves conflicts between them and returns them.
|
|
|
|
Returns:
|
|
a Deferred tuple of (`state_group`, `state`, `prev_state`).
|
|
`state_group` is the name of a state group if one and only one is
|
|
involved. `state` is a map from (type, state_key) to event, and
|
|
`prev_state` is a list of event ids.
|
|
"""
|
|
logger.debug("resolve_state_groups event_ids %s", event_ids)
|
|
|
|
state_groups_ids = yield self.store.get_state_groups_ids(
|
|
room_id, event_ids
|
|
)
|
|
|
|
logger.debug(
|
|
"resolve_state_groups state_groups %s",
|
|
state_groups_ids.keys()
|
|
)
|
|
|
|
group_names = frozenset(state_groups_ids.keys())
|
|
if len(group_names) == 1:
|
|
name, state_list = state_groups_ids.items().pop()
|
|
|
|
defer.returnValue(_StateCacheEntry(
|
|
state=state_list,
|
|
state_group=name,
|
|
prev_group=name,
|
|
delta_ids={},
|
|
))
|
|
|
|
with (yield self.resolve_linearizer.queue(group_names)):
|
|
if self._state_cache is not None:
|
|
cache = self._state_cache.get(group_names, None)
|
|
if cache:
|
|
defer.returnValue(cache)
|
|
|
|
logger.info(
|
|
"Resolving state for %s with %d groups", room_id, len(state_groups_ids)
|
|
)
|
|
|
|
state = {}
|
|
for st in state_groups_ids.values():
|
|
for key, e_id in st.items():
|
|
state.setdefault(key, set()).add(e_id)
|
|
|
|
conflicted_state = {
|
|
k: list(v)
|
|
for k, v in state.items()
|
|
if len(v) > 1
|
|
}
|
|
|
|
if conflicted_state:
|
|
logger.info("Resolving conflicted state for %r", room_id)
|
|
with Measure(self.clock, "state._resolve_events"):
|
|
new_state = yield resolve_events(
|
|
state_groups_ids.values(),
|
|
state_map_factory=lambda ev_ids: self.store.get_events(
|
|
ev_ids, get_prev_content=False, check_redacted=False,
|
|
),
|
|
)
|
|
else:
|
|
new_state = {
|
|
key: e_ids.pop() for key, e_ids in state.items()
|
|
}
|
|
|
|
state_group = None
|
|
new_state_event_ids = frozenset(new_state.values())
|
|
for sg, events in state_groups_ids.items():
|
|
if new_state_event_ids == frozenset(e_id for e_id in events):
|
|
state_group = sg
|
|
break
|
|
if state_group is None:
|
|
# Worker instances don't have access to this method, but we want
|
|
# to set the state_group on the main instance to increase cache
|
|
# hits.
|
|
if hasattr(self.store, "get_next_state_group"):
|
|
state_group = self.store.get_next_state_group()
|
|
|
|
prev_group = None
|
|
delta_ids = None
|
|
for old_group, old_ids in state_groups_ids.items():
|
|
if not set(new_state.iterkeys()) - set(old_ids.iterkeys()):
|
|
n_delta_ids = {
|
|
k: v
|
|
for k, v in new_state.items()
|
|
if old_ids.get(k) != v
|
|
}
|
|
if not delta_ids or len(n_delta_ids) < len(delta_ids):
|
|
prev_group = old_group
|
|
delta_ids = n_delta_ids
|
|
|
|
cache = _StateCacheEntry(
|
|
state=new_state,
|
|
state_group=state_group,
|
|
prev_group=prev_group,
|
|
delta_ids=delta_ids,
|
|
)
|
|
|
|
if self._state_cache is not None:
|
|
self._state_cache[group_names] = cache
|
|
|
|
defer.returnValue(cache)
|
|
|
|
def resolve_events(self, state_sets, event):
|
|
logger.info(
|
|
"Resolving state for %s with %d groups", event.room_id, len(state_sets)
|
|
)
|
|
state_set_ids = [{
|
|
(ev.type, ev.state_key): ev.event_id
|
|
for ev in st
|
|
} for st in state_sets]
|
|
|
|
state_map = {
|
|
ev.event_id: ev
|
|
for st in state_sets
|
|
for ev in st
|
|
}
|
|
|
|
with Measure(self.clock, "state._resolve_events"):
|
|
new_state = resolve_events(state_set_ids, state_map)
|
|
|
|
new_state = {
|
|
key: state_map[ev_id] for key, ev_id in new_state.items()
|
|
}
|
|
|
|
return new_state
|
|
|
|
|
|
def _ordered_events(events):
|
|
def key_func(e):
|
|
return -int(e.depth), hashlib.sha1(e.event_id).hexdigest()
|
|
|
|
return sorted(events, key=key_func)
|
|
|
|
|
|
def resolve_events(state_sets, state_map_factory):
|
|
"""
|
|
Args:
|
|
state_sets(list): List of dicts of (type, state_key) -> event_id,
|
|
which are the different state groups to resolve.
|
|
state_map_factory(dict|callable): If callable, then 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. Otherwise, should be
|
|
a dict from event_id to event of all events in state_sets.
|
|
|
|
Returns
|
|
dict[(str, str), synapse.events.FrozenEvent] is a map from
|
|
(type, state_key) to event.
|
|
"""
|
|
unconflicted_state, conflicted_state = _seperate(
|
|
state_sets,
|
|
)
|
|
|
|
if callable(state_map_factory):
|
|
return _resolve_with_state_fac(
|
|
unconflicted_state, conflicted_state, state_map_factory
|
|
)
|
|
|
|
state_map = state_map_factory
|
|
|
|
auth_events = _create_auth_events_from_maps(
|
|
unconflicted_state, conflicted_state, state_map
|
|
)
|
|
|
|
return _resolve_with_state(
|
|
unconflicted_state, conflicted_state, auth_events, state_map
|
|
)
|
|
|
|
|
|
def _seperate(state_sets):
|
|
"""Takes the state_sets and figures out which keys are conflicted and
|
|
which aren't. i.e., which have multiple different event_ids associated
|
|
with them in different state sets.
|
|
"""
|
|
unconflicted_state = dict(state_sets[0])
|
|
conflicted_state = {}
|
|
|
|
for state_set in state_sets[1:]:
|
|
for key, value in state_set.iteritems():
|
|
# 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
|
|
|
|
|
|
@defer.inlineCallbacks
|
|
def _resolve_with_state_fac(unconflicted_state, conflicted_state,
|
|
state_map_factory):
|
|
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))
|
|
|
|
state_map = yield state_map_factory(needed_events)
|
|
|
|
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:
|
|
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
|