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Try to spot state deletions when they happen (#2489)

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Neil Alexander 2022-05-25 16:40:31 +01:00 committed by GitHub
parent ff53398635
commit 6940c7c7dd
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4 changed files with 12 additions and 16 deletions
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4
roomserver/internal/input/input_events.go
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@ -535,8 +535,6 @@ func (r *Inputer) calculateAndSetState(
roomState := state.NewStateResolution(updater, roomInfo) roomState := state.NewStateResolution(updater, roomInfo)
if input.HasState { if input.HasState {
stateAtEvent.Overwrite = true
// We've been told what the state at the event is so we don't need to calculate it. // We've been told what the state at the event is so we don't need to calculate it.
// Check that those state events are in the database and store the state. // Check that those state events are in the database and store the state.
var entries []types.StateEntry var entries []types.StateEntry
@ -549,8 +547,6 @@ func (r *Inputer) calculateAndSetState(
return fmt.Errorf("updater.AddState: %w", err) return fmt.Errorf("updater.AddState: %w", err)
} }
} else { } else {
stateAtEvent.Overwrite = false
// We haven't been told what the state at the event is so we need to calculate it from the prev_events // We haven't been told what the state at the event is so we need to calculate it from the prev_events
if stateAtEvent.BeforeStateSnapshotNID, err = roomState.CalculateAndStoreStateBeforeEvent(ctx, event, isRejected); err != nil { if stateAtEvent.BeforeStateSnapshotNID, err = roomState.CalculateAndStoreStateBeforeEvent(ctx, event, isRejected); err != nil {
return fmt.Errorf("roomState.CalculateAndStoreStateBeforeEvent: %w", err) return fmt.Errorf("roomState.CalculateAndStoreStateBeforeEvent: %w", err)

19
roomserver/internal/input/input_latest_events.go
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@ -27,6 +27,7 @@ import (
"github.com/matrix-org/dendrite/roomserver/types" "github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib" "github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util" "github.com/matrix-org/util"
"github.com/sirupsen/logrus"
) )
// updateLatestEvents updates the list of latest events for this room in the database and writes the // updateLatestEvents updates the list of latest events for this room in the database and writes the
@ -258,13 +259,6 @@ func (u *latestEventsUpdater) latestState() error {
return fmt.Errorf("roomState.CalculateAndStoreStateAfterEvents: %w", err) return fmt.Errorf("roomState.CalculateAndStoreStateAfterEvents: %w", err)
} }
// If we are overwriting the state then we should make sure that we
// don't send anything out over federation again, it will very likely
// be a repeat.
if u.stateAtEvent.Overwrite {
u.sendAsServer = ""
}
// Now that we have a new state snapshot based on the latest events, // Now that we have a new state snapshot based on the latest events,
// we can compare that new snapshot to the previous one and see what // we can compare that new snapshot to the previous one and see what
// has changed. This gives us one list of removed state events and // has changed. This gives us one list of removed state events and
@ -277,6 +271,17 @@ func (u *latestEventsUpdater) latestState() error {
return fmt.Errorf("roomState.DifferenceBetweenStateSnapshots: %w", err) return fmt.Errorf("roomState.DifferenceBetweenStateSnapshots: %w", err)
} }
if removed := len(u.removed) - len(u.added); removed > 0 {
logrus.WithFields(logrus.Fields{
"event_id": u.event.EventID(),
"room_id": u.event.RoomID(),
"old_state_nid": u.oldStateNID,
"new_state_nid": u.newStateNID,
"old_latest": u.oldLatest,
"new_latest": u.latest,
}).Errorf("Unexpected state deletion (removing %d events)", removed)
}
// Also work out the state before the event removes and the event // Also work out the state before the event removes and the event
// adds. // adds.
u.stateBeforeEventRemoves, u.stateBeforeEventAdds, err = roomState.DifferenceBetweeenStateSnapshots( u.stateBeforeEventRemoves, u.stateBeforeEventAdds, err = roomState.DifferenceBetweeenStateSnapshots(

1
roomserver/storage/tables/events_table_test.go
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@ -85,7 +85,6 @@ func Test_EventsTable(t *testing.T) {
assert.NoError(t, err) assert.NoError(t, err)
} }
stateAtEvent := types.StateAtEvent{ stateAtEvent := types.StateAtEvent{
Overwrite: false,
BeforeStateSnapshotNID: types.StateSnapshotNID(stateSnapshot), BeforeStateSnapshotNID: types.StateSnapshotNID(stateSnapshot),
IsRejected: false, IsRejected: false,
StateEntry: types.StateEntry{ StateEntry: types.StateEntry{

4
roomserver/types/types.go
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@ -173,10 +173,6 @@ func DeduplicateStateEntries(a []StateEntry) []StateEntry {
// StateAtEvent is the state before and after a matrix event. // StateAtEvent is the state before and after a matrix event.
type StateAtEvent struct { type StateAtEvent struct {
// Should this state overwrite the latest events and memberships of the room?
// This might be necessary when rejoining a federated room after a period of
// absence, as our state and latest events will be out of date.
Overwrite bool
// The state before the event. // The state before the event.
BeforeStateSnapshotNID StateSnapshotNID BeforeStateSnapshotNID StateSnapshotNID
// True if this StateEntry is rejected. State resolution should then treat this // True if this StateEntry is rejected. State resolution should then treat this