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Fix RewritesState bug (#1557)

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* Set RewritesState once

* Check if any new state provided

* Obey rewritesState

* Don't nuke everything the sync API knows when purging state

* Fix panic from duplicate insert

* Consistency

* Use HasState

* Remove nolint

* Clean up joined rooms on state rewrite
This commit is contained in:
Neil Alexander 2020-10-22 10:39:16 +01:00 • committed by GitHub
parent 04dc019e5e
commit 3afc623098
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 65 additions and 28 deletions
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12
roomserver/internal/input/input_latest_events.go
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@ -116,7 +116,6 @@ type latestEventsUpdater struct {
func (u *latestEventsUpdater) doUpdateLatestEvents() error {
u.lastEventIDSent = u.updater.LastEventIDSent()
u.oldStateNID = u.updater.CurrentStateSnapshotNID()
// If we are doing a regular event update then we will get the
// previous latest events to use as a part of the calculation. If
@ -125,7 +124,8 @@ func (u *latestEventsUpdater) doUpdateLatestEvents() error {
// then start with an empty set - none of the forward extremities
// that we knew about before matter anymore.
oldLatest := []types.StateAtEventAndReference{}
if !u.stateAtEvent.Overwrite {
if !u.rewritesState {
u.oldStateNID = u.updater.CurrentStateSnapshotNID()
oldLatest = u.updater.LatestEvents()
}
@ -153,7 +153,7 @@ func (u *latestEventsUpdater) doUpdateLatestEvents() error {
// Now that we know what the latest events are, it's time to get the
// latest state.
var updates []api.OutputEvent
if extremitiesChanged {
if extremitiesChanged || u.rewritesState {
if err = u.latestState(); err != nil {
return fmt.Errorf("u.latestState: %w", err)
}
@ -324,7 +324,6 @@ func (u *latestEventsUpdater) calculateLatest(
}
func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error) {
latestEventIDs := make([]string, len(u.latest))
for i := range u.latest {
latestEventIDs[i] = u.latest[i].EventID
@ -365,11 +364,6 @@ func (u *latestEventsUpdater) makeOutputNewRoomEvent() (*api.OutputEvent, error)
return nil, fmt.Errorf("failed to load add_state_events from db: %w", err)
}
}
// State is rewritten if the input room event HasState and we actually produced a delta on state events.
// Without this check, /get_missing_events which produce events with associated (but not complete) state
// will incorrectly purge the room and set it to no state. TODO: This is likely flakey, as if /gme produced
// a state conflict res which just so happens to include 2+ events we might purge the room state downstream.
ore.RewritesState = len(ore.AddsStateEventIDs) > 1
return &api.OutputEvent{
Type: api.OutputTypeNewRoomEvent,