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Fix a bug whereby backfilling could leak events across rooms (#1043)

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* Fix a bug whereby backfilling could leak events across rooms

Caused by a faulty SQL query. With tests now.

* comment
This commit is contained in:
Kegsay 2020-05-15 16:27:34 +01:00 committed by GitHub
parent 5f6f8adaa5
commit 8db60c90bb
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 57 additions and 8 deletions
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8
syncapi/storage/postgres/output_room_events_topology_table.go
View file

@ -48,17 +48,17 @@ const insertEventInTopologySQL = "" +
const selectEventIDsInRangeASCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND" +
" WHERE room_id = $1 AND (" +
"(topological_position > $2 AND topological_position < $3) OR" +
"(topological_position = $4 AND stream_position <= $5)" +
" ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
") ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
const selectEventIDsInRangeDESCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND" +
" WHERE room_id = $1 AND (" +
"(topological_position > $2 AND topological_position < $3) OR" +
"(topological_position = $4 AND stream_position <= $5)" +
" ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
") ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
const selectPositionInTopologySQL = "" +
"SELECT topological_position, stream_position FROM syncapi_output_room_events_topology" +

8
syncapi/storage/sqlite3/output_room_events_topology_table.go
View file

@ -45,17 +45,17 @@ const insertEventInTopologySQL = "" +
const selectEventIDsInRangeASCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND" +
" WHERE room_id = $1 AND (" +
"(topological_position > $2 AND topological_position < $3) OR" +
"(topological_position = $4 AND stream_position <= $5)" +
" ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
") ORDER BY topological_position ASC, stream_position ASC LIMIT $6"
const selectEventIDsInRangeDESCSQL = "" +
"SELECT event_id FROM syncapi_output_room_events_topology" +
" WHERE room_id = $1 AND" +
" WHERE room_id = $1 AND (" +
"(topological_position > $2 AND topological_position < $3) OR" +
"(topological_position = $4 AND stream_position <= $5)" +
" ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
") ORDER BY topological_position DESC, stream_position DESC LIMIT $6"
const selectPositionInTopologySQL = "" +
"SELECT topological_position, stream_position FROM syncapi_output_room_events_topology" +

49
syncapi/storage/storage_test.go
View file

@ -405,6 +405,55 @@ func TestGetEventsInRangeWithEventsSameDepth(t *testing.T) {
}
}
// The purpose of this test is to make sure that the query to pull out events is honouring the room ID correctly.
// It works by creating two rooms with the same events in them, then selecting events by topological range.
// Specifically, we know that events with the same depth but lower stream positions are selected, and it's possible
// that this check isn't using the room ID if the brackets are wrong in the SQL query.
func TestGetEventsInTopologicalRangeMultiRoom(t *testing.T) {
t.Parallel()
db := MustCreateDatabase(t)
makeEvents := func(roomID string) (events []gomatrixserverlib.HeaderedEvent) {
events = append(events, MustCreateEvent(t, roomID, nil, &gomatrixserverlib.EventBuilder{
Content: []byte(fmt.Sprintf(`{"room_version":"4","creator":"%s"}`, testUserIDA)),
Type: "m.room.create",
StateKey: &emptyStateKey,
Sender: testUserIDA,
Depth: int64(len(events) + 1),
}))
events = append(events, MustCreateEvent(t, roomID, []gomatrixserverlib.HeaderedEvent{events[len(events)-1]}, &gomatrixserverlib.EventBuilder{
Content: []byte(fmt.Sprintf(`{"membership":"join"}`)),
Type: "m.room.member",
StateKey: &testUserIDA,
Sender: testUserIDA,
Depth: int64(len(events) + 1),
}))
return
}
roomA := "!room_a:" + string(testOrigin)
roomB := "!room_b:" + string(testOrigin)
eventsA := makeEvents(roomA)
eventsB := makeEvents(roomB)
MustWriteEvents(t, db, eventsA)
MustWriteEvents(t, db, eventsB)
from, err := db.MaxTopologicalPosition(ctx, roomB)
if err != nil {
t.Fatalf("failed to get MaxTopologicalPosition: %s", err)
}
// head towards the beginning of time
to := types.NewTopologyToken(0, 0)
// Query using room B as room A was inserted first and hence A will have lower stream positions but identical depths,
// allowing this bug to surface.
paginatedEvents, err := db.GetEventsInTopologicalRange(ctx, &from, &to, roomB, 5, true)
if err != nil {
t.Fatalf("GetEventsInRange returned an error: %s", err)
}
gots := gomatrixserverlib.HeaderedToClientEvents(db.StreamEventsToEvents(&testUserDeviceA, paginatedEvents), gomatrixserverlib.FormatAll)
assertEventsEqual(t, "", true, gots, reversed(eventsB))
}
// The purpose of this test is to make sure that events are returned in the right *order* when they have been inserted in a manner similar to
// how any kind of backfill operation will insert the events. This test inserts the SimpleRoom events in a manner similar to how backfill over
// federation would: