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Merge pull request #3541 from matrix-org/rav/optimize_filter_events_for_server

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Refactor and optimze filter_events_for_server
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Richard van der Hoff 2018-07-17 14:01:39 +01:00 committed by GitHub
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4 changed files with 409 additions and 138 deletions
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1
changelog.d/3541.feature Normal file
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@ -0,0 +1 @@
Optimisation to make handling incoming federation requests more efficient.

144
synapse/handlers/federation.py
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@ -43,7 +43,6 @@ from synapse.crypto.event_signing import (
add_hashes_and_signatures,
compute_event_signature,
)
from synapse.events.utils import prune_event
from synapse.events.validator import EventValidator
from synapse.state import resolve_events_with_factory
from synapse.types import UserID, get_domain_from_id
@ -52,8 +51,8 @@ from synapse.util.async import Linearizer
from synapse.util.distributor import user_joined_room
from synapse.util.frozenutils import unfreeze
from synapse.util.logutils import log_function
from synapse.util.metrics import measure_func
from synapse.util.retryutils import NotRetryingDestination
from synapse.visibility import filter_events_for_server
from ._base import BaseHandler
@ -501,137 +500,6 @@ class FederationHandler(BaseHandler):
user = UserID.from_string(event.state_key)
yield user_joined_room(self.distributor, user, event.room_id)
@measure_func("_filter_events_for_server")
@defer.inlineCallbacks
def _filter_events_for_server(self, server_name, room_id, events):
"""Filter the given events for the given server, redacting those the
server can't see.
Assumes the server is currently in the room.
Returns
list[FrozenEvent]
"""
# First lets check to see if all the events have a history visibility
# of "shared" or "world_readable". If thats the case then we don't
# need to check membership (as we know the server is in the room).
event_to_state_ids = yield self.store.get_state_ids_for_events(
frozenset(e.event_id for e in events),
types=(
(EventTypes.RoomHistoryVisibility, ""),
)
)
visibility_ids = set()
for sids in event_to_state_ids.itervalues():
hist = sids.get((EventTypes.RoomHistoryVisibility, ""))
if hist:
visibility_ids.add(hist)
# If we failed to find any history visibility events then the default
# is "shared" visiblity.
if not visibility_ids:
defer.returnValue(events)
event_map = yield self.store.get_events(visibility_ids)
all_open = all(
e.content.get("history_visibility") in (None, "shared", "world_readable")
for e in event_map.itervalues()
)
if all_open:
defer.returnValue(events)
# Ok, so we're dealing with events that have non-trivial visibility
# rules, so we need to also get the memberships of the room.
event_to_state_ids = yield self.store.get_state_ids_for_events(
frozenset(e.event_id for e in events),
types=(
(EventTypes.RoomHistoryVisibility, ""),
(EventTypes.Member, None),
)
)
# We only want to pull out member events that correspond to the
# server's domain.
def check_match(id):
try:
return server_name == get_domain_from_id(id)
except Exception:
return False
# Parses mapping `event_id -> (type, state_key) -> state event_id`
# to get all state ids that we're interested in.
event_map = yield self.store.get_events([
e_id
for key_to_eid in list(event_to_state_ids.values())
for key, e_id in key_to_eid.items()
if key[0] != EventTypes.Member or check_match(key[1])
])
event_to_state = {
e_id: {
key: event_map[inner_e_id]
for key, inner_e_id in key_to_eid.iteritems()
if inner_e_id in event_map
}
for e_id, key_to_eid in event_to_state_ids.iteritems()
}
erased_senders = yield self.store.are_users_erased(
e.sender for e in events,
)
def redact_disallowed(event, state):
# if the sender has been gdpr17ed, always return a redacted
# copy of the event.
if erased_senders[event.sender]:
logger.info(
"Sender of %s has been erased, redacting",
event.event_id,
)
return prune_event(event)
if not state:
return event
history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
if history:
visibility = history.content.get("history_visibility", "shared")
if visibility in ["invited", "joined"]:
# We now loop through all state events looking for
# membership states for the requesting server to determine
# if the server is either in the room or has been invited
# into the room.
for ev in state.itervalues():
if ev.type != EventTypes.Member:
continue
try:
domain = get_domain_from_id(ev.state_key)
except Exception:
continue
if domain != server_name:
continue
memtype = ev.membership
if memtype == Membership.JOIN:
return event
elif memtype == Membership.INVITE:
if visibility == "invited":
return event
else:
return prune_event(event)
return event
defer.returnValue([
redact_disallowed(e, event_to_state[e.event_id])
for e in events
])
@log_function
@defer.inlineCallbacks
def backfill(self, dest, room_id, limit, extremities):
@ -1558,7 +1426,7 @@ class FederationHandler(BaseHandler):
limit
)
events = yield self._filter_events_for_server(origin, room_id, events)
events = yield filter_events_for_server(self.store, origin, events)
defer.returnValue(events)
@ -1605,8 +1473,8 @@ class FederationHandler(BaseHandler):
if not in_room:
raise AuthError(403, "Host not in room.")
events = yield self._filter_events_for_server(
origin, event.room_id, [event]
events = yield filter_events_for_server(
self.store, origin, [event],
)
event = events[0]
defer.returnValue(event)
@ -1896,8 +1764,8 @@ class FederationHandler(BaseHandler):
min_depth=min_depth,
)
missing_events = yield self._filter_events_for_server(
origin, room_id, missing_events,
missing_events = yield filter_events_for_server(
self.store, origin, missing_events,
)
defer.returnValue(missing_events)

141
synapse/visibility.py
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@ -16,10 +16,13 @@ import itertools
import logging
import operator
import six
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.events.utils import prune_event
from synapse.types import get_domain_from_id
from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
logger = logging.getLogger(__name__)
@ -225,3 +228,141 @@ def filter_events_for_client(store, user_id, events, is_peeking=False,
# we turn it into a list before returning it.
defer.returnValue(list(filtered_events))
@defer.inlineCallbacks
def filter_events_for_server(store, server_name, events):
# First lets check to see if all the events have a history visibility
# of "shared" or "world_readable". If thats the case then we don't
# need to check membership (as we know the server is in the room).
event_to_state_ids = yield store.get_state_ids_for_events(
frozenset(e.event_id for e in events),
types=(
(EventTypes.RoomHistoryVisibility, ""),
)
)
visibility_ids = set()
for sids in event_to_state_ids.itervalues():
hist = sids.get((EventTypes.RoomHistoryVisibility, ""))
if hist:
visibility_ids.add(hist)
# If we failed to find any history visibility events then the default
# is "shared" visiblity.
if not visibility_ids:
defer.returnValue(events)
event_map = yield store.get_events(visibility_ids)
all_open = all(
e.content.get("history_visibility") in (None, "shared", "world_readable")
for e in event_map.itervalues()
)
if all_open:
defer.returnValue(events)
# Ok, so we're dealing with events that have non-trivial visibility
# rules, so we need to also get the memberships of the room.
# first, for each event we're wanting to return, get the event_ids
# of the history vis and membership state at those events.
event_to_state_ids = yield store.get_state_ids_for_events(
frozenset(e.event_id for e in events),
types=(
(EventTypes.RoomHistoryVisibility, ""),
(EventTypes.Member, None),
)
)
# We only want to pull out member events that correspond to the
# server's domain.
#
# event_to_state_ids contains lots of duplicates, so it turns out to be
# cheaper to build a complete set of unique
# ((type, state_key), event_id) tuples, and then filter out the ones we
# don't want.
#
state_key_to_event_id_set = {
e
for key_to_eid in six.itervalues(event_to_state_ids)
for e in key_to_eid.items()
}
def include(typ, state_key):
if typ != EventTypes.Member:
return True
# we avoid using get_domain_from_id here for efficiency.
idx = state_key.find(":")
if idx == -1:
return False
return state_key[idx + 1:] == server_name
event_map = yield store.get_events([
e_id
for key, e_id in state_key_to_event_id_set
if include(key[0], key[1])
])
event_to_state = {
e_id: {
key: event_map[inner_e_id]
for key, inner_e_id in key_to_eid.iteritems()
if inner_e_id in event_map
}
for e_id, key_to_eid in event_to_state_ids.iteritems()
}
erased_senders = yield store.are_users_erased(
e.sender for e in events,
)
def redact_disallowed(event, state):
# if the sender has been gdpr17ed, always return a redacted
# copy of the event.
if erased_senders[event.sender]:
logger.info(
"Sender of %s has been erased, redacting",
event.event_id,
)
return prune_event(event)
if not state:
return event
history = state.get((EventTypes.RoomHistoryVisibility, ''), None)
if history:
visibility = history.content.get("history_visibility", "shared")
if visibility in ["invited", "joined"]:
# We now loop through all state events looking for
# membership states for the requesting server to determine
# if the server is either in the room or has been invited
# into the room.
for ev in state.itervalues():
if ev.type != EventTypes.Member:
continue
try:
domain = get_domain_from_id(ev.state_key)
except Exception:
continue
if domain != server_name:
continue
memtype = ev.membership
if memtype == Membership.JOIN:
return event
elif memtype == Membership.INVITE:
if visibility == "invited":
return event
else:
# server has no users in the room: redact
return prune_event(event)
return event
defer.returnValue([
redact_disallowed(e, event_to_state[e.event_id])
for e in events
])

261
tests/test_visibility.py Normal file
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@ -0,0 +1,261 @@
# -*- 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 logging
from twisted.internet import defer
from twisted.internet.defer import succeed
from synapse.events import FrozenEvent
from synapse.visibility import filter_events_for_server
import tests.unittest
from tests.utils import setup_test_homeserver
logger = logging.getLogger(__name__)
TEST_ROOM_ID = "!TEST:ROOM"
class FilterEventsForServerTestCase(tests.unittest.TestCase):
@defer.inlineCallbacks
def setUp(self):
self.hs = yield setup_test_homeserver()
self.event_creation_handler = self.hs.get_event_creation_handler()
self.event_builder_factory = self.hs.get_event_builder_factory()
self.store = self.hs.get_datastore()
@defer.inlineCallbacks
def test_filtering(self):
#
# The events to be filtered consist of 10 membership events (it doesn't
# really matter if they are joins or leaves, so let's make them joins).
# One of those membership events is going to be for a user on the
# server we are filtering for (so we can check the filtering is doing
# the right thing).
#
# before we do that, we persist some other events to act as state.
self.inject_visibility("@admin:hs", "joined")
for i in range(0, 10):
yield self.inject_room_member("@resident%i:hs" % i)
events_to_filter = []
for i in range(0, 10):
user = "@user%i:%s" % (
i, "test_server" if i == 5 else "other_server"
)
evt = yield self.inject_room_member(user, extra_content={"a": "b"})
events_to_filter.append(evt)
filtered = yield filter_events_for_server(
self.store, "test_server", events_to_filter,
)
# the result should be 5 redacted events, and 5 unredacted events.
for i in range(0, 5):
self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
self.assertNotIn("a", filtered[i].content)
for i in range(5, 10):
self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
self.assertEqual(filtered[i].content["a"], "b")
@defer.inlineCallbacks
def inject_visibility(self, user_id, visibility):
content = {"history_visibility": visibility}
builder = self.event_builder_factory.new({
"type": "m.room.history_visibility",
"sender": user_id,
"state_key": "",
"room_id": TEST_ROOM_ID,
"content": content,
})
event, context = yield self.event_creation_handler.create_new_client_event(
builder
)
yield self.hs.get_datastore().persist_event(event, context)
defer.returnValue(event)
@defer.inlineCallbacks
def inject_room_member(self, user_id, membership="join", extra_content={}):
content = {"membership": membership}
content.update(extra_content)
builder = self.event_builder_factory.new({
"type": "m.room.member",
"sender": user_id,
"state_key": user_id,
"room_id": TEST_ROOM_ID,
"content": content,
})
event, context = yield self.event_creation_handler.create_new_client_event(
builder
)
yield self.hs.get_datastore().persist_event(event, context)
defer.returnValue(event)
@defer.inlineCallbacks
def test_large_room(self):
# see what happens when we have a large room with hundreds of thousands
# of membership events
# As above, the events to be filtered consist of 10 membership events,
# where one of them is for a user on the server we are filtering for.
import cProfile
import pstats
import time
# we stub out the store, because building up all that state the normal
# way is very slow.
test_store = _TestStore()
# our initial state is 100000 membership events and one
# history_visibility event.
room_state = []
history_visibility_evt = FrozenEvent({
"event_id": "$history_vis",
"type": "m.room.history_visibility",
"sender": "@resident_user_0:test.com",
"state_key": "",
"room_id": TEST_ROOM_ID,
"content": {"history_visibility": "joined"},
})
room_state.append(history_visibility_evt)
test_store.add_event(history_visibility_evt)
for i in range(0, 100000):
user = "@resident_user_%i:test.com" % (i, )
evt = FrozenEvent({
"event_id": "$res_event_%i" % (i, ),
"type": "m.room.member",
"state_key": user,
"sender": user,
"room_id": TEST_ROOM_ID,
"content": {
"membership": "join",
"extra": "zzz,"
},
})
room_state.append(evt)
test_store.add_event(evt)
events_to_filter = []
for i in range(0, 10):
user = "@user%i:%s" % (
i, "test_server" if i == 5 else "other_server"
)
evt = FrozenEvent({
"event_id": "$evt%i" % (i, ),
"type": "m.room.member",
"state_key": user,
"sender": user,
"room_id": TEST_ROOM_ID,
"content": {
"membership": "join",
"extra": "zzz",
},
})
events_to_filter.append(evt)
room_state.append(evt)
test_store.add_event(evt)
test_store.set_state_ids_for_event(evt, {
(e.type, e.state_key): e.event_id for e in room_state
})
pr = cProfile.Profile()
pr.enable()
logger.info("Starting filtering")
start = time.time()
filtered = yield filter_events_for_server(
test_store, "test_server", events_to_filter,
)
logger.info("Filtering took %f seconds", time.time() - start)
pr.disable()
with open("filter_events_for_server.profile", "w+") as f:
ps = pstats.Stats(pr, stream=f).sort_stats('cumulative')
ps.print_stats()
# the result should be 5 redacted events, and 5 unredacted events.
for i in range(0, 5):
self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
self.assertNotIn("extra", filtered[i].content)
for i in range(5, 10):
self.assertEqual(events_to_filter[i].event_id, filtered[i].event_id)
self.assertEqual(filtered[i].content["extra"], "zzz")
test_large_room.skip = "Disabled by default because it's slow"
class _TestStore(object):
"""Implements a few methods of the DataStore, so that we can test
filter_events_for_server
"""
def __init__(self):
# data for get_events: a map from event_id to event
self.events = {}
# data for get_state_ids_for_events mock: a map from event_id to
# a map from (type_state_key) -> event_id for the state at that
# event
self.state_ids_for_events = {}
def add_event(self, event):
self.events[event.event_id] = event
def set_state_ids_for_event(self, event, state):
self.state_ids_for_events[event.event_id] = state
def get_state_ids_for_events(self, events, types):
res = {}
include_memberships = False
for (type, state_key) in types:
if type == "m.room.history_visibility":
continue
if type != "m.room.member" or state_key is not None:
raise RuntimeError(
"Unimplemented: get_state_ids with type (%s, %s)" %
(type, state_key),
)
include_memberships = True
if include_memberships:
for event_id in events:
res[event_id] = self.state_ids_for_events[event_id]
else:
k = ("m.room.history_visibility", "")
for event_id in events:
hve = self.state_ids_for_events[event_id][k]
res[event_id] = {k: hve}
return succeed(res)
def get_events(self, events):
return succeed({
event_id: self.events[event_id] for event_id in events
})
def are_users_erased(self, users):
return succeed({u: False for u in users})