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Prefer /state_ids when missing state across federation (#1008)
* Prefer /state_ids when missing state across federation * Linting * Better logging
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9d15312ef6
commit
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@ -54,7 +54,7 @@ func (c *RoomserverProducer) SendEvents(
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// SendEventWithState writes an event with KindNew to the roomserver input log
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// with the state at the event as KindOutlier before it.
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func (c *RoomserverProducer) SendEventWithState(
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ctx context.Context, state gomatrixserverlib.RespState, event gomatrixserverlib.HeaderedEvent,
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ctx context.Context, state *gomatrixserverlib.RespState, event gomatrixserverlib.HeaderedEvent,
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) error {
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outliers, err := state.Events()
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if err != nil {
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@ -26,6 +26,7 @@ import (
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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"github.com/sirupsen/logrus"
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)
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// Send implements /_matrix/federation/v1/send/{txnID}
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@ -297,22 +298,27 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event, roomVer
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// However not all version of synapse support /state_ids so you may
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// need to fallback to /state.
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// TODO: Attempt to fill in the gap using /get_missing_events
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// TODO: Attempt to fetch the state using /state_ids and /events
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state, err := t.federation.LookupState(t.context, t.Origin, e.RoomID(), e.EventID(), roomVersion)
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// Attempt to fetch the missing state using /state_ids and /events
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var respState *gomatrixserverlib.RespState
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var err error
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respState, err = t.lookupMissingStateViaStateIDs(e, roomVersion)
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if err != nil {
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return err
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}
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// Check that the returned state is valid.
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if err := state.Check(t.context, t.keys); err != nil {
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return err
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// Fallback to /state
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util.GetLogger(t.context).WithError(err).Warn("processEventWithMissingState failed to /state_ids, falling back to /state")
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respState, err = t.lookupMissingStateViaState(e, roomVersion)
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if err != nil {
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return err
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}
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}
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// Check that the event is allowed by the state.
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retryAllowedState:
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if err := checkAllowedByState(e, state.StateEvents); err != nil {
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if err := checkAllowedByState(e, respState.StateEvents); err != nil {
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switch missing := err.(type) {
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case gomatrixserverlib.MissingAuthEventError:
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// An auth event was missing so let's look up that event over federation
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for _, s := range state.StateEvents {
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for _, s := range respState.StateEvents {
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if s.EventID() != missing.AuthEventID {
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continue
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}
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@ -329,5 +335,113 @@ retryAllowedState:
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}
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// pass the event along with the state to the roomserver
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return t.producer.SendEventWithState(t.context, state, e.Headered(roomVersion))
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return t.producer.SendEventWithState(t.context, respState, e.Headered(roomVersion))
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}
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func (t *txnReq) lookupMissingStateViaState(e gomatrixserverlib.Event, roomVersion gomatrixserverlib.RoomVersion) (
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respState *gomatrixserverlib.RespState, err error) {
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state, err := t.federation.LookupState(t.context, t.Origin, e.RoomID(), e.EventID(), roomVersion)
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if err != nil {
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return nil, err
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}
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// Check that the returned state is valid.
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if err := state.Check(t.context, t.keys); err != nil {
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return nil, err
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}
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return &state, nil
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}
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func (t *txnReq) lookupMissingStateViaStateIDs(e gomatrixserverlib.Event, roomVersion gomatrixserverlib.RoomVersion) (
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*gomatrixserverlib.RespState, error) {
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// fetch all the state events we do know about: the current state
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queryReq := api.QueryLatestEventsAndStateRequest{
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RoomID: e.RoomID(),
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StateToFetch: nil, // fetch all state
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}
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var queryRes api.QueryLatestEventsAndStateResponse
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if err := t.rsAPI.QueryLatestEventsAndState(t.context, &queryReq, &queryRes); err != nil {
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return nil, err
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}
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if !queryRes.RoomExists {
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return nil, fmt.Errorf("room %s doesn't exist", e.RoomID())
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}
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// allow indexing of current state by event ID
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haveEventMap := make(map[string]*gomatrixserverlib.HeaderedEvent, len(queryRes.StateEvents))
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for i := range queryRes.StateEvents {
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haveEventMap[queryRes.StateEvents[i].EventID()] = &queryRes.StateEvents[i]
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}
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// fetch the state event IDs at the time of the event
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stateIDs, err := t.federation.LookupStateIDs(t.context, t.Origin, e.RoomID(), e.EventID())
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if err != nil {
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return nil, err
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}
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// work out which auth/state IDs are missing
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wantIDs := append(stateIDs.StateEventIDs, stateIDs.AuthEventIDs...)
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missing := make(map[string]bool)
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for _, sid := range wantIDs {
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if _, ok := haveEventMap[sid]; !ok {
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missing[sid] = true
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}
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}
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util.GetLogger(t.context).WithFields(logrus.Fields{
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"missing": len(missing),
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"event_id": e.EventID(),
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"room_id": e.RoomID(),
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"already_have": len(queryRes.StateEvents),
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"total_state": len(stateIDs.StateEventIDs),
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"total_auth_events": len(stateIDs.AuthEventIDs),
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}).Info("Fetching missing state at event")
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for missingEventID := range missing {
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txn, err := t.federation.GetEvent(t.context, t.Origin, missingEventID)
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if err != nil {
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util.GetLogger(t.context).WithError(err).WithField("event_id", missingEventID).Warn("failed to get missing /event for event ID")
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return nil, err
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}
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for _, pdu := range txn.PDUs {
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event, err := gomatrixserverlib.NewEventFromUntrustedJSON(pdu, roomVersion)
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if err != nil {
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util.GetLogger(t.context).WithError(err).Warnf("Transaction: Failed to parse event JSON of event %q", event.EventID())
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return nil, unmarshalError{err}
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}
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if err := gomatrixserverlib.VerifyAllEventSignatures(t.context, []gomatrixserverlib.Event{event}, t.keys); err != nil {
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util.GetLogger(t.context).WithError(err).Warnf("Transaction: Couldn't validate signature of event %q", event.EventID())
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return nil, verifySigError{event.EventID(), err}
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}
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h := event.Headered(roomVersion)
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haveEventMap[event.EventID()] = &h
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}
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}
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return t.createRespStateFromStateIDs(stateIDs, haveEventMap)
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}
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func (t *txnReq) createRespStateFromStateIDs(stateIDs gomatrixserverlib.RespStateIDs, haveEventMap map[string]*gomatrixserverlib.HeaderedEvent) (
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*gomatrixserverlib.RespState, error) {
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// create a RespState response using the response to /state_ids as a guide
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respState := gomatrixserverlib.RespState{
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AuthEvents: make([]gomatrixserverlib.Event, len(stateIDs.AuthEventIDs)),
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StateEvents: make([]gomatrixserverlib.Event, len(stateIDs.StateEventIDs)),
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}
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for i := range stateIDs.StateEventIDs {
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ev, ok := haveEventMap[stateIDs.StateEventIDs[i]]
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if !ok {
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return nil, fmt.Errorf("missing state event %s", stateIDs.StateEventIDs[i])
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}
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respState.StateEvents[i] = ev.Unwrap()
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}
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for i := range stateIDs.AuthEventIDs {
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ev, ok := haveEventMap[stateIDs.AuthEventIDs[i]]
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if !ok {
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return nil, fmt.Errorf("missing auth event %s", stateIDs.AuthEventIDs[i])
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}
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respState.AuthEvents[i] = ev.Unwrap()
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}
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// Check that the returned state is valid.
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if err := respState.Check(t.context, t.keys); err != nil {
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return nil, err
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}
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return &respState, nil
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}
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@ -29,7 +29,7 @@ type QueryLatestEventsAndStateRequest struct {
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// The room ID to query the latest events for.
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RoomID string `json:"room_id"`
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// The state key tuples to fetch from the room current state.
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// If this list is empty or nil then no state events are returned.
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// If this list is empty or nil then *ALL* current state events are returned.
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StateToFetch []gomatrixserverlib.StateKeyTuple `json:"state_to_fetch"`
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}
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