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Fix bug in sliding sync when using old DB. (#17398)

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We don't necessarily have `instance_name` for old events (before we
support multiple event persisters). We treat those as if the
`instance_name` was "master".

---------

Co-authored-by: Eric Eastwood <eric.eastwood@beta.gouv.fr>
This commit is contained in:
Erik Johnston 2024-07-08 20:30:23 +01:00 committed by GitHub
parent 3fef535ff2
commit 8cdd2d214e
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8 changed files with 33 additions and 212 deletions
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1
changelog.d/17398.bugfix Normal file
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@ -0,0 +1 @@
Fix bug in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint when using an old database.

6
synapse/storage/_base.py
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@ -119,9 +119,6 @@ class SQLBaseStore(metaclass=ABCMeta):
self._attempt_to_invalidate_cache(
"get_user_in_room_with_profile", (room_id, user_id)
)
self._attempt_to_invalidate_cache(
"get_rooms_for_user_with_stream_ordering", (user_id,)
)
self._attempt_to_invalidate_cache("get_rooms_for_user", (user_id,))
# Purge other caches based on room state.
@ -148,9 +145,6 @@ class SQLBaseStore(metaclass=ABCMeta):
self._attempt_to_invalidate_cache("get_local_users_in_room", (room_id,))
self._attempt_to_invalidate_cache("does_pair_of_users_share_a_room", None)
self._attempt_to_invalidate_cache("get_user_in_room_with_profile", None)
self._attempt_to_invalidate_cache(
"get_rooms_for_user_with_stream_ordering", None
)
self._attempt_to_invalidate_cache("get_rooms_for_user", None)
self._attempt_to_invalidate_cache("get_room_summary", (room_id,))

10
synapse/storage/databases/main/cache.py
View file

@ -268,16 +268,12 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
self._curr_state_delta_stream_cache.entity_has_changed(data.room_id, token) # type: ignore[attr-defined]
if data.type == EventTypes.Member:
self.get_rooms_for_user_with_stream_ordering.invalidate( # type: ignore[attr-defined]
(data.state_key,)
)
self.get_rooms_for_user.invalidate((data.state_key,)) # type: ignore[attr-defined]
elif row.type == EventsStreamAllStateRow.TypeId:
assert isinstance(data, EventsStreamAllStateRow)
# Similar to the above, but the entire caches are invalidated. This is
# unfortunate for the membership caches, but should recover quickly.
self._curr_state_delta_stream_cache.entity_has_changed(data.room_id, token) # type: ignore[attr-defined]
self.get_rooms_for_user_with_stream_ordering.invalidate_all() # type: ignore[attr-defined]
self.get_rooms_for_user.invalidate_all() # type: ignore[attr-defined]
else:
raise Exception("Unknown events stream row type %s" % (row.type,))
@ -334,9 +330,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
self._attempt_to_invalidate_cache(
"get_invited_rooms_for_local_user", (state_key,)
)
self._attempt_to_invalidate_cache(
"get_rooms_for_user_with_stream_ordering", (state_key,)
)
self._attempt_to_invalidate_cache("get_rooms_for_user", (state_key,))
self._attempt_to_invalidate_cache(
@ -399,9 +392,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
self._attempt_to_invalidate_cache("get_thread_id", None)
self._attempt_to_invalidate_cache("get_thread_id_for_receipts", None)
self._attempt_to_invalidate_cache("get_invited_rooms_for_local_user", None)
self._attempt_to_invalidate_cache(
"get_rooms_for_user_with_stream_ordering", None
)
self._attempt_to_invalidate_cache("get_rooms_for_user", None)
self._attempt_to_invalidate_cache("did_forget", None)
self._attempt_to_invalidate_cache("get_forgotten_rooms_for_user", None)

3
synapse/storage/databases/main/events_worker.py
View file

@ -1457,7 +1457,8 @@ class EventsWorkerStore(SQLBaseStore):
event_dict[event_id] = _EventRow(
event_id=event_id,
stream_ordering=row[1],
instance_name=row[2],
# If instance_name is null we default to "master"
instance_name=row[2] or "master",
internal_metadata=row[3],
json=row[4],
format_version=row[5],

67
synapse/storage/databases/main/roommember.py
View file

@ -50,12 +50,7 @@ from synapse.storage.database import (
from synapse.storage.databases.main.cache import CacheInvalidationWorkerStore
from synapse.storage.databases.main.events_worker import EventsWorkerStore
from synapse.storage.engines import Sqlite3Engine
from synapse.storage.roommember import (
GetRoomsForUserWithStreamOrdering,
MemberSummary,
ProfileInfo,
RoomsForUser,
)
from synapse.storage.roommember import MemberSummary, ProfileInfo, RoomsForUser
from synapse.types import (
JsonDict,
PersistedEventPosition,
@ -494,7 +489,11 @@ class RoomMemberWorkerStore(EventsWorkerStore, CacheInvalidationWorkerStore):
sender=sender,
membership=membership,
event_id=event_id,
event_pos=PersistedEventPosition(instance_name, stream_ordering),
event_pos=PersistedEventPosition(
# If instance_name is null we default to "master"
instance_name or "master",
stream_ordering,
),
room_version_id=room_version,
)
for room_id, sender, membership, event_id, instance_name, stream_ordering, room_version in txn
@ -606,53 +605,6 @@ class RoomMemberWorkerStore(EventsWorkerStore, CacheInvalidationWorkerStore):
return results
@cached(max_entries=500000, iterable=True)
async def get_rooms_for_user_with_stream_ordering(
self, user_id: str
) -> FrozenSet[GetRoomsForUserWithStreamOrdering]:
"""Returns a set of room_ids the user is currently joined to.
If a remote user only returns rooms this server is currently
participating in.
Args:
user_id
Returns:
Returns the rooms the user is in currently, along with the stream
ordering of the most recent join for that user and room, along with
the room version of the room.
"""
return await self.db_pool.runInteraction(
"get_rooms_for_user_with_stream_ordering",
self._get_rooms_for_user_with_stream_ordering_txn,
user_id,
)
def _get_rooms_for_user_with_stream_ordering_txn(
self, txn: LoggingTransaction, user_id: str
) -> FrozenSet[GetRoomsForUserWithStreamOrdering]:
# We use `current_state_events` here and not `local_current_membership`
# as a) this gets called with remote users and b) this only gets called
# for rooms the server is participating in.
sql = """
SELECT room_id, e.instance_name, e.stream_ordering
FROM current_state_events AS c
INNER JOIN events AS e USING (room_id, event_id)
WHERE
c.type = 'm.room.member'
AND c.state_key = ?
AND c.membership = ?
"""
txn.execute(sql, (user_id, Membership.JOIN))
return frozenset(
GetRoomsForUserWithStreamOrdering(
room_id, PersistedEventPosition(instance, stream_id)
)
for room_id, instance, stream_id in txn
)
async def get_users_server_still_shares_room_with(
self, user_ids: Collection[str]
) -> Set[str]:
@ -701,13 +653,6 @@ class RoomMemberWorkerStore(EventsWorkerStore, CacheInvalidationWorkerStore):
If a remote user only returns rooms this server is currently
participating in.
"""
rooms = self.get_rooms_for_user_with_stream_ordering.cache.get_immediate(
(user_id,),
None,
update_metrics=False,
)
if rooms:
return frozenset(r.room_id for r in rooms)
room_ids = await self.db_pool.simple_select_onecol(
table="current_state_events",

33
synapse/storage/databases/main/stream.py
View file

@ -371,7 +371,7 @@ def _make_generic_sql_bound(
def _filter_results(
lower_token: Optional[RoomStreamToken],
upper_token: Optional[RoomStreamToken],
instance_name: str,
instance_name: Optional[str],
topological_ordering: int,
stream_ordering: int,
) -> bool:
@ -384,8 +384,14 @@ def _filter_results(
position maps, which we handle by fetching more than necessary from the DB
and then filtering (rather than attempting to construct a complicated SQL
query).
The `instance_name` arg is optional to handle historic rows, and is
interpreted as if it was "master".
"""
if instance_name is None:
instance_name = "master"
event_historical_tuple = (
topological_ordering,
stream_ordering,
@ -420,7 +426,7 @@ def _filter_results(
def _filter_results_by_stream(
lower_token: Optional[RoomStreamToken],
upper_token: Optional[RoomStreamToken],
instance_name: str,
instance_name: Optional[str],
stream_ordering: int,
) -> bool:
"""
@ -436,7 +442,14 @@ def _filter_results_by_stream(
position maps, which we handle by fetching more than necessary from the DB
and then filtering (rather than attempting to construct a complicated SQL
query).
The `instance_name` arg is optional to handle historic rows, and is
interpreted as if it was "master".
"""
if instance_name is None:
instance_name = "master"
if lower_token:
assert lower_token.topological is None
@ -912,7 +925,6 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
prev_sender,
) in txn:
assert room_id is not None
assert instance_name is not None
assert stream_ordering is not None
if _filter_results_by_stream(
@ -936,7 +948,8 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
# Event
event_id=event_id,
event_pos=PersistedEventPosition(
instance_name=instance_name,
# If instance_name is null we default to "master"
instance_name=instance_name or "master",
stream=stream_ordering,
),
# When `s.event_id = null`, we won't be able to get respective
@ -952,13 +965,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
prev_event_id=prev_event_id,
prev_event_pos=(
PersistedEventPosition(
instance_name=prev_instance_name,
# If instance_name is null we default to "master"
instance_name=prev_instance_name or "master",
stream=prev_stream_ordering,
)
if (
prev_instance_name is not None
and prev_stream_ordering is not None
)
if (prev_stream_ordering is not None)
else None
),
prev_membership=prev_membership,
@ -1270,7 +1281,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
stream_ordering=stream_ordering,
):
return event_id, PersistedEventPosition(
instance_name, stream_ordering
# If instance_name is null we default to "master"
instance_name or "master",
stream_ordering,
)
return None

1
tests/handlers/test_sync.py
View file

@ -210,7 +210,6 @@ class SyncTestCase(tests.unittest.HomeserverTestCase):
)
# Blow away caches (supported room versions can only change due to a restart).
self.store.get_rooms_for_user_with_stream_ordering.invalidate_all()
self.store.get_rooms_for_user.invalidate_all()
self.store._get_event_cache.clear()
self.store._event_ref.clear()

124
tests/replication/storage/test_events.py
View file

@ -30,19 +30,16 @@ from synapse.api.constants import ReceiptTypes
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase, make_event_from_dict
from synapse.events.snapshot import EventContext
from synapse.handlers.room import RoomEventSource
from synapse.server import HomeServer
from synapse.storage.databases.main.event_push_actions import (
NotifCounts,
RoomNotifCounts,
)
from synapse.storage.databases.main.events_worker import EventsWorkerStore
from synapse.storage.roommember import GetRoomsForUserWithStreamOrdering, RoomsForUser
from synapse.storage.roommember import RoomsForUser
from synapse.types import PersistedEventPosition
from synapse.util import Clock
from tests.server import FakeTransport
from ._base import BaseWorkerStoreTestCase
USER_ID = "@feeling:test"
@ -221,125 +218,6 @@ class EventsWorkerStoreTestCase(BaseWorkerStoreTestCase):
),
)
def test_get_rooms_for_user_with_stream_ordering(self) -> None:
"""Check that the cache on get_rooms_for_user_with_stream_ordering is invalidated
by rows in the events stream
"""
self.persist(type="m.room.create", key="", creator=USER_ID)
self.persist(type="m.room.member", key=USER_ID, membership="join")
self.replicate()
self.check("get_rooms_for_user_with_stream_ordering", (USER_ID_2,), set())
j2 = self.persist(
type="m.room.member", sender=USER_ID_2, key=USER_ID_2, membership="join"
)
assert j2.internal_metadata.instance_name is not None
assert j2.internal_metadata.stream_ordering is not None
self.replicate()
expected_pos = PersistedEventPosition(
j2.internal_metadata.instance_name, j2.internal_metadata.stream_ordering
)
self.check(
"get_rooms_for_user_with_stream_ordering",
(USER_ID_2,),
{GetRoomsForUserWithStreamOrdering(ROOM_ID, expected_pos)},
)
def test_get_rooms_for_user_with_stream_ordering_with_multi_event_persist(
self,
) -> None:
"""Check that current_state invalidation happens correctly with multiple events
in the persistence batch.
This test attempts to reproduce a race condition between the event persistence
loop and a worker-based Sync handler.
The problem occurred when the master persisted several events in one batch. It
only updates the current_state at the end of each batch, so the obvious thing
to do is then to issue a current_state_delta stream update corresponding to the
last stream_id in the batch.
However, that raises the possibility that a worker will see the replication
notification for a join event before the current_state caches are invalidated.
The test involves:
* creating a join and a message event for a user, and persisting them in the
same batch
* controlling the replication stream so that updates are sent gradually
* between each bunch of replication updates, check that we see a consistent
snapshot of the state.
"""
self.persist(type="m.room.create", key="", creator=USER_ID)
self.persist(type="m.room.member", key=USER_ID, membership="join")
self.replicate()
self.check("get_rooms_for_user_with_stream_ordering", (USER_ID_2,), set())
# limit the replication rate
repl_transport = self._server_transport
assert isinstance(repl_transport, FakeTransport)
repl_transport.autoflush = False
# build the join and message events and persist them in the same batch.
logger.info("----- build test events ------")
j2, j2ctx = self.build_event(
type="m.room.member", sender=USER_ID_2, key=USER_ID_2, membership="join"
)
msg, msgctx = self.build_event()
self.get_success(self.persistance.persist_events([(j2, j2ctx), (msg, msgctx)]))
self.replicate()
assert j2.internal_metadata.instance_name is not None
assert j2.internal_metadata.stream_ordering is not None
event_source = RoomEventSource(self.hs)
event_source.store = self.worker_store
current_token = event_source.get_current_key()
# gradually stream out the replication
while repl_transport.buffer:
logger.info("------ flush ------")
repl_transport.flush(30)
self.pump(0)
prev_token = current_token
current_token = event_source.get_current_key()
# attempt to replicate the behaviour of the sync handler.
#
# First, we get a list of the rooms we are joined to
joined_rooms = self.get_success(
self.worker_store.get_rooms_for_user_with_stream_ordering(USER_ID_2)
)
# Then, we get a list of the events since the last sync
membership_changes = self.get_success(
self.worker_store.get_membership_changes_for_user(
USER_ID_2, prev_token, current_token
)
)
logger.info(
"%s->%s: joined_rooms=%r membership_changes=%r",
prev_token,
current_token,
joined_rooms,
membership_changes,
)
# the membership change is only any use to us if the room is in the
# joined_rooms list.
if membership_changes:
expected_pos = PersistedEventPosition(
j2.internal_metadata.instance_name,
j2.internal_metadata.stream_ordering,
)
self.assertEqual(
joined_rooms,
{GetRoomsForUserWithStreamOrdering(ROOM_ID, expected_pos)},
)
event_id = 0
def persist(self, backfill: bool = False, **kwargs: Any) -> EventBase: