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dendrite/roomserver/internal/input/input_events.go
Neil Alexander 4c2a10f1a6
Handle state before, send history visibility in output (#2532)
* Check state before event

* Tweaks

* Refactor a bit, include in output events

* Don't waste time if soft failed either

* Tweak control flow, comments, use GMSL history visibility type
2022-06-13 15:11:10 +01:00

686 lines
25 KiB
Go

// Copyright 2017 Vector Creations Ltd
// Copyright 2018 New Vector Ltd
// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package input
import (
"bytes"
"context"
"fmt"
"time"
fedapi "github.com/matrix-org/dendrite/federationapi/api"
"github.com/matrix-org/dendrite/internal"
"github.com/matrix-org/dendrite/internal/eventutil"
"github.com/matrix-org/dendrite/internal/hooks"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/internal/helpers"
"github.com/matrix-org/dendrite/roomserver/state"
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
)
// TODO: Does this value make sense?
const MaximumMissingProcessingTime = time.Minute * 2
var processRoomEventDuration = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "dendrite",
Subsystem: "roomserver",
Name: "processroomevent_duration_millis",
Help: "How long it takes the roomserver to process an event",
Buckets: []float64{ // milliseconds
5, 10, 25, 50, 75, 100, 250, 500,
1000, 2000, 3000, 4000, 5000, 6000,
7000, 8000, 9000, 10000, 15000, 20000,
},
},
[]string{"room_id"},
)
// processRoomEvent can only be called once at a time
//
// TODO(#375): This should be rewritten to allow concurrent calls. The
// difficulty is in ensuring that we correctly annotate events with the correct
// state deltas when sending to kafka streams
// TODO: Break up function - we should probably do transaction ID checks before calling this.
// nolint:gocyclo
func (r *Inputer) processRoomEvent(
ctx context.Context,
input *api.InputRoomEvent,
) error {
select {
case <-ctx.Done():
// Before we do anything, make sure the context hasn't expired for this pending task.
// If it has then we'll give up straight away — it's probably a synchronous input
// request and the caller has already given up, but the inbox task was still queued.
return context.DeadlineExceeded
default:
}
span, ctx := opentracing.StartSpanFromContext(ctx, "processRoomEvent")
span.SetTag("room_id", input.Event.RoomID())
span.SetTag("event_id", input.Event.EventID())
defer span.Finish()
// Measure how long it takes to process this event.
started := time.Now()
defer func() {
timetaken := time.Since(started)
processRoomEventDuration.With(prometheus.Labels{
"room_id": input.Event.RoomID(),
}).Observe(float64(timetaken.Milliseconds()))
}()
// Parse and validate the event JSON
headered := input.Event
event := headered.Unwrap()
logger := util.GetLogger(ctx).WithFields(logrus.Fields{
"event_id": event.EventID(),
"room_id": event.RoomID(),
"kind": input.Kind,
"origin": input.Origin,
"type": event.Type(),
})
if input.HasState {
logger = logger.WithFields(logrus.Fields{
"has_state": input.HasState,
"state_ids": len(input.StateEventIDs),
})
}
// if we have already got this event then do not process it again, if the input kind is an outlier.
// Outliers contain no extra information which may warrant a re-processing.
if input.Kind == api.KindOutlier {
evs, err2 := r.DB.EventsFromIDs(ctx, []string{event.EventID()})
if err2 == nil && len(evs) == 1 {
// check hash matches if we're on early room versions where the event ID was a random string
idFormat, err2 := headered.RoomVersion.EventIDFormat()
if err2 == nil {
switch idFormat {
case gomatrixserverlib.EventIDFormatV1:
if bytes.Equal(event.EventReference().EventSHA256, evs[0].EventReference().EventSHA256) {
logger.Debugf("Already processed event; ignoring")
return nil
}
default:
logger.Debugf("Already processed event; ignoring")
return nil
}
}
}
}
// Don't waste time processing the event if the room doesn't exist.
// A room entry locally will only be created in response to a create
// event.
roomInfo, rerr := r.DB.RoomInfo(ctx, event.RoomID())
if rerr != nil {
return fmt.Errorf("r.DB.RoomInfo: %w", rerr)
}
isCreateEvent := event.Type() == gomatrixserverlib.MRoomCreate && event.StateKeyEquals("")
if roomInfo == nil && !isCreateEvent {
return fmt.Errorf("room %s does not exist for event %s", event.RoomID(), event.EventID())
}
var missingAuth, missingPrev bool
serverRes := &fedapi.QueryJoinedHostServerNamesInRoomResponse{}
if !isCreateEvent {
missingAuthIDs, missingPrevIDs, err := r.DB.MissingAuthPrevEvents(ctx, event)
if err != nil {
return fmt.Errorf("updater.MissingAuthPrevEvents: %w", err)
}
missingAuth = len(missingAuthIDs) > 0
missingPrev = !input.HasState && len(missingPrevIDs) > 0
}
if missingAuth || missingPrev {
serverReq := &fedapi.QueryJoinedHostServerNamesInRoomRequest{
RoomID: event.RoomID(),
ExcludeSelf: true,
}
if err := r.FSAPI.QueryJoinedHostServerNamesInRoom(ctx, serverReq, serverRes); err != nil {
return fmt.Errorf("r.FSAPI.QueryJoinedHostServerNamesInRoom: %w", err)
}
// Sort all of the servers into a map so that we can randomise
// their order. Then make sure that the input origin and the
// event origin are first on the list.
servers := map[gomatrixserverlib.ServerName]struct{}{}
for _, server := range serverRes.ServerNames {
servers[server] = struct{}{}
}
serverRes.ServerNames = serverRes.ServerNames[:0]
if input.Origin != "" {
serverRes.ServerNames = append(serverRes.ServerNames, input.Origin)
delete(servers, input.Origin)
}
if origin := event.Origin(); origin != input.Origin {
serverRes.ServerNames = append(serverRes.ServerNames, origin)
delete(servers, origin)
}
for server := range servers {
serverRes.ServerNames = append(serverRes.ServerNames, server)
delete(servers, server)
}
}
// First of all, check that the auth events of the event are known.
// If they aren't then we will ask the federation API for them.
isRejected := false
authEvents := gomatrixserverlib.NewAuthEvents(nil)
knownEvents := map[string]*types.Event{}
if err := r.fetchAuthEvents(ctx, logger, headered, &authEvents, knownEvents, serverRes.ServerNames); err != nil {
return fmt.Errorf("r.fetchAuthEvents: %w", err)
}
// Check if the event is allowed by its auth events. If it isn't then
// we consider the event to be "rejected" — it will still be persisted.
var rejectionErr error
if rejectionErr = gomatrixserverlib.Allowed(event, &authEvents); rejectionErr != nil {
isRejected = true
logger.WithError(rejectionErr).Warnf("Event %s not allowed by auth events", event.EventID())
}
// Accumulate the auth event NIDs.
authEventIDs := event.AuthEventIDs()
authEventNIDs := make([]types.EventNID, 0, len(authEventIDs))
for _, authEventID := range authEventIDs {
if _, ok := knownEvents[authEventID]; !ok {
// Unknown auth events only really matter if the event actually failed
// auth. If it passed auth then we can assume that everything that was
// known was sufficient, even if extraneous auth events were specified
// but weren't found.
if isRejected {
if event.StateKey() != nil {
return fmt.Errorf(
"missing auth event %s for state event %s (type %q, state key %q)",
authEventID, event.EventID(), event.Type(), *event.StateKey(),
)
} else {
return fmt.Errorf(
"missing auth event %s for timeline event %s (type %q)",
authEventID, event.EventID(), event.Type(),
)
}
}
} else {
authEventNIDs = append(authEventNIDs, knownEvents[authEventID].EventNID)
}
}
var softfail bool
if input.Kind == api.KindNew {
// Check that the event passes authentication checks based on the
// current room state.
var err error
softfail, err = helpers.CheckForSoftFail(ctx, r.DB, headered, input.StateEventIDs)
if err != nil {
logger.WithError(err).Warn("Error authing soft-failed event")
}
}
// At this point we are checking whether we know all of the prev events, and
// if we know the state before the prev events. This is necessary before we
// try to do `calculateAndSetState` on the event later, otherwise it will fail
// with missing event NIDs. If there's anything missing then we'll go and fetch
// the prev events and state from the federation. Note that we only do this if
// we weren't already told what the state before the event should be — if the
// HasState option was set and a state set was provided (as is the case in a
// typical federated room join) then we won't bother trying to fetch prev events
// because we may not be allowed to see them and we have no choice but to trust
// the state event IDs provided to us in the join instead.
if missingPrev && input.Kind == api.KindNew {
// Don't do this for KindOld events, otherwise old events that we fetch
// to satisfy missing prev events/state will end up recursively calling
// processRoomEvent.
if len(serverRes.ServerNames) > 0 {
missingState := missingStateReq{
origin: input.Origin,
inputer: r,
db: r.DB,
roomInfo: roomInfo,
federation: r.FSAPI,
keys: r.KeyRing,
roomsMu: internal.NewMutexByRoom(),
servers: serverRes.ServerNames,
hadEvents: map[string]bool{},
haveEvents: map[string]*gomatrixserverlib.Event{},
}
if stateSnapshot, err := missingState.processEventWithMissingState(ctx, event, headered.RoomVersion); err != nil {
// Something went wrong with retrieving the missing state, so we can't
// really do anything with the event other than reject it at this point.
isRejected = true
rejectionErr = fmt.Errorf("missingState.processEventWithMissingState: %w", err)
} else if stateSnapshot != nil {
// We retrieved some state and we ended up having to call /state_ids for
// the new event in question (probably because closing the gap by using
// /get_missing_events didn't do what we hoped) so we'll instead overwrite
// the state snapshot with the newly resolved state.
missingPrev = false
input.HasState = true
input.StateEventIDs = make([]string, 0, len(stateSnapshot.StateEvents))
for _, e := range stateSnapshot.StateEvents {
input.StateEventIDs = append(input.StateEventIDs, e.EventID())
}
} else {
// We retrieved some state and it would appear that rolling forward the
// state did everything we needed it to do, so we can just resolve the
// state for the event in the normal way.
missingPrev = false
}
} else {
// We're missing prev events or state for the event, but for some reason
// we don't know any servers to ask. In this case we can't do anything but
// reject the event and hope that it gets unrejected later.
isRejected = true
rejectionErr = fmt.Errorf("missing prev events and no other servers to ask")
}
}
// Get the state before the event so that we can work out if the event was
// allowed at the time, and also to get the history visibility. We won't
// bother doing this if the event was already rejected as it just ends up
// burning CPU time.
historyVisibility := gomatrixserverlib.HistoryVisibilityJoined // Default to restrictive.
if rejectionErr == nil && !isRejected && !softfail {
var err error
historyVisibility, rejectionErr, err = r.processStateBefore(ctx, input, missingPrev)
if err != nil {
return fmt.Errorf("r.processStateBefore: %w", err)
}
if rejectionErr != nil {
isRejected = true
}
}
// Store the event.
_, _, stateAtEvent, redactionEvent, redactedEventID, err := r.DB.StoreEvent(ctx, event, authEventNIDs, isRejected || softfail)
if err != nil {
return fmt.Errorf("updater.StoreEvent: %w", err)
}
// if storing this event results in it being redacted then do so.
if !isRejected && redactedEventID == event.EventID() {
r, rerr := eventutil.RedactEvent(redactionEvent, event)
if rerr != nil {
return fmt.Errorf("eventutil.RedactEvent: %w", rerr)
}
event = r
}
// For outliers we can stop after we've stored the event itself as it
// doesn't have any associated state to store and we don't need to
// notify anyone about it.
if input.Kind == api.KindOutlier {
logger.Debug("Stored outlier")
hooks.Run(hooks.KindNewEventPersisted, headered)
return nil
}
// Request the room info again — it's possible that the room has been
// created by now if it didn't exist already.
roomInfo, err = r.DB.RoomInfo(ctx, event.RoomID())
if err != nil {
return fmt.Errorf("updater.RoomInfo: %w", err)
}
if roomInfo == nil {
return fmt.Errorf("updater.RoomInfo missing for room %s", event.RoomID())
}
if input.HasState || (!missingPrev && stateAtEvent.BeforeStateSnapshotNID == 0) {
// We haven't calculated a state for this event yet.
// Lets calculate one.
err = r.calculateAndSetState(ctx, input, roomInfo, &stateAtEvent, event, isRejected)
if err != nil {
return fmt.Errorf("r.calculateAndSetState: %w", err)
}
}
// We stop here if the event is rejected: We've stored it but won't update forward extremities or notify anyone about it.
if isRejected || softfail {
logger.WithError(rejectionErr).WithFields(logrus.Fields{
"soft_fail": softfail,
"missing_prev": missingPrev,
}).Warn("Stored rejected event")
if rejectionErr != nil {
return types.RejectedError(rejectionErr.Error())
}
return nil
}
switch input.Kind {
case api.KindNew:
if err = r.updateLatestEvents(
ctx, // context
roomInfo, // room info for the room being updated
stateAtEvent, // state at event (below)
event, // event
input.SendAsServer, // send as server
input.TransactionID, // transaction ID
input.HasState, // rewrites state?
historyVisibility, // the history visibility before the event
); err != nil {
return fmt.Errorf("r.updateLatestEvents: %w", err)
}
case api.KindOld:
err = r.WriteOutputEvents(event.RoomID(), []api.OutputEvent{
{
Type: api.OutputTypeOldRoomEvent,
OldRoomEvent: &api.OutputOldRoomEvent{
Event: headered,
HistoryVisibility: historyVisibility,
},
},
})
if err != nil {
return fmt.Errorf("r.WriteOutputEvents (old): %w", err)
}
}
// processing this event resulted in an event (which may not be the one we're processing)
// being redacted. We are guaranteed to have both sides (the redaction/redacted event),
// so notify downstream components to redact this event - they should have it if they've
// been tracking our output log.
if redactedEventID != "" {
err = r.WriteOutputEvents(event.RoomID(), []api.OutputEvent{
{
Type: api.OutputTypeRedactedEvent,
RedactedEvent: &api.OutputRedactedEvent{
RedactedEventID: redactedEventID,
RedactedBecause: redactionEvent.Headered(headered.RoomVersion),
},
},
})
if err != nil {
return fmt.Errorf("r.WriteOutputEvents (redactions): %w", err)
}
}
// Everything was OK — the latest events updater didn't error and
// we've sent output events. Finally, generate a hook call.
hooks.Run(hooks.KindNewEventPersisted, headered)
return nil
}
// processStateBefore works out what the state is before the event and
// then checks the event auths against the state at the time. It also
// tries to determine what the history visibility was of the event at
// the time, so that it can be sent in the output event to downstream
// components.
// nolint:nakedret
func (r *Inputer) processStateBefore(
ctx context.Context,
input *api.InputRoomEvent,
missingPrev bool,
) (historyVisibility gomatrixserverlib.HistoryVisibility, rejectionErr error, err error) {
historyVisibility = gomatrixserverlib.HistoryVisibilityJoined // Default to restrictive.
event := input.Event.Unwrap()
isCreateEvent := event.Type() == gomatrixserverlib.MRoomCreate && event.StateKeyEquals("")
var stateBeforeEvent []*gomatrixserverlib.Event
switch {
case isCreateEvent:
// There's no state before a create event so there is nothing
// else to do.
return
case input.HasState:
// If we're overriding the state then we need to go and retrieve
// them from the database. It's a hard error if they are missing.
stateEvents, err := r.DB.EventsFromIDs(ctx, input.StateEventIDs)
if err != nil {
return "", nil, fmt.Errorf("r.DB.EventsFromIDs: %w", err)
}
stateBeforeEvent = make([]*gomatrixserverlib.Event, 0, len(stateEvents))
for _, entry := range stateEvents {
stateBeforeEvent = append(stateBeforeEvent, entry.Event)
}
case missingPrev:
// We don't know all of the prev events, so we can't work out
// the state before the event. Reject it in that case.
rejectionErr = fmt.Errorf("event %q has missing prev events", event.EventID())
return
case len(event.PrevEventIDs()) == 0:
// There should be prev events since it's not a create event.
// A non-create event that claims to have no prev events is
// invalid, so reject it.
rejectionErr = fmt.Errorf("event %q must have prev events", event.EventID())
return
default:
// For all non-create events, there must be prev events, so we'll
// ask the query API for the relevant tuples needed for auth. We
// will include the history visibility here even though we don't
// actually need it for auth, because we want to send it in the
// output events.
tuplesNeeded := gomatrixserverlib.StateNeededForAuth([]*gomatrixserverlib.Event{event}).Tuples()
tuplesNeeded = append(tuplesNeeded, gomatrixserverlib.StateKeyTuple{
EventType: gomatrixserverlib.MRoomHistoryVisibility,
StateKey: "",
})
stateBeforeReq := &api.QueryStateAfterEventsRequest{
RoomID: event.RoomID(),
PrevEventIDs: event.PrevEventIDs(),
StateToFetch: tuplesNeeded,
}
stateBeforeRes := &api.QueryStateAfterEventsResponse{}
if err := r.Queryer.QueryStateAfterEvents(ctx, stateBeforeReq, stateBeforeRes); err != nil {
return "", nil, fmt.Errorf("r.Queryer.QueryStateAfterEvents: %w", err)
}
switch {
case !stateBeforeRes.RoomExists:
rejectionErr = fmt.Errorf("room %q does not exist", event.RoomID())
return
case !stateBeforeRes.PrevEventsExist:
rejectionErr = fmt.Errorf("prev events of %q are not known", event.EventID())
return
default:
stateBeforeEvent = gomatrixserverlib.UnwrapEventHeaders(stateBeforeRes.StateEvents)
}
}
// At this point, stateBeforeEvent should be populated either by
// the supplied state in the input request, or from the prev events.
// Check whether the event is allowed or not.
stateBeforeAuth := gomatrixserverlib.NewAuthEvents(stateBeforeEvent)
if rejectionErr = gomatrixserverlib.Allowed(event, &stateBeforeAuth); rejectionErr != nil {
return
}
// Work out what the history visibility was at the time of the
// event.
for _, event := range stateBeforeEvent {
if event.Type() != gomatrixserverlib.MRoomHistoryVisibility || !event.StateKeyEquals("") {
continue
}
if hisVis, err := event.HistoryVisibility(); err == nil {
historyVisibility = hisVis
break
}
}
return
}
// fetchAuthEvents will check to see if any of the
// auth events specified by the given event are unknown. If they are
// then we will go off and request them from the federation and then
// store them in the database. By the time this function ends, either
// we've failed to retrieve the auth chain altogether (in which case
// an error is returned) or we've successfully retrieved them all and
// they are now in the database.
func (r *Inputer) fetchAuthEvents(
ctx context.Context,
logger *logrus.Entry,
event *gomatrixserverlib.HeaderedEvent,
auth *gomatrixserverlib.AuthEvents,
known map[string]*types.Event,
servers []gomatrixserverlib.ServerName,
) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "fetchAuthEvents")
defer span.Finish()
unknown := map[string]struct{}{}
authEventIDs := event.AuthEventIDs()
if len(authEventIDs) == 0 {
return nil
}
for _, authEventID := range authEventIDs {
authEvents, err := r.DB.EventsFromIDs(ctx, []string{authEventID})
if err != nil || len(authEvents) == 0 || authEvents[0].Event == nil {
unknown[authEventID] = struct{}{}
continue
}
ev := authEvents[0]
known[authEventID] = &ev // don't take the pointer of the iterated event
if err = auth.AddEvent(ev.Event); err != nil {
return fmt.Errorf("auth.AddEvent: %w", err)
}
}
// If there are no missing auth events then there is nothing more
// to do — we've loaded everything that we need.
if len(unknown) == 0 {
return nil
}
var err error
var res gomatrixserverlib.RespEventAuth
var found bool
for _, serverName := range servers {
// Request the entire auth chain for the event in question. This should
// contain all of the auth events — including ones that we already know —
// so we'll need to filter through those in the next section.
res, err = r.FSAPI.GetEventAuth(ctx, serverName, event.RoomVersion, event.RoomID(), event.EventID())
if err != nil {
logger.WithError(err).Warnf("Failed to get event auth from federation for %q: %s", event.EventID(), err)
continue
}
found = true
break
}
if !found {
return fmt.Errorf("no servers provided event auth for event ID %q, tried servers %v", event.EventID(), servers)
}
// Reuse these to reduce allocations.
authEventNIDs := make([]types.EventNID, 0, 5)
isRejected := false
nextAuthEvent:
for _, authEvent := range gomatrixserverlib.ReverseTopologicalOrdering(
res.AuthEvents.UntrustedEvents(event.RoomVersion),
gomatrixserverlib.TopologicalOrderByAuthEvents,
) {
// If we already know about this event from the database then we don't
// need to store it again or do anything further with it, so just skip
// over it rather than wasting cycles.
if ev, ok := known[authEvent.EventID()]; ok && ev != nil {
continue nextAuthEvent
}
// Check the signatures of the event. If this fails then we'll simply
// skip it, because gomatrixserverlib.Allowed() will notice a problem
// if a critical event is missing anyway.
if err := authEvent.VerifyEventSignatures(ctx, r.FSAPI.KeyRing()); err != nil {
continue nextAuthEvent
}
// In order to store the new auth event, we need to know its auth chain
// as NIDs for the `auth_event_nids` column. Let's see if we can find those.
authEventNIDs = authEventNIDs[:0]
for _, eventID := range authEvent.AuthEventIDs() {
knownEvent, ok := known[eventID]
if !ok {
continue nextAuthEvent
}
authEventNIDs = append(authEventNIDs, knownEvent.EventNID)
}
// Check if the auth event should be rejected.
err := gomatrixserverlib.Allowed(authEvent, auth)
if isRejected = err != nil; isRejected {
logger.WithError(err).Warnf("Auth event %s rejected", authEvent.EventID())
}
// Finally, store the event in the database.
eventNID, _, _, _, _, err := r.DB.StoreEvent(ctx, authEvent, authEventNIDs, isRejected)
if err != nil {
return fmt.Errorf("updater.StoreEvent: %w", err)
}
// Let's take a note of the fact that we now know about this event for
// authenticating future events.
if !isRejected {
if err := auth.AddEvent(authEvent); err != nil {
return fmt.Errorf("auth.AddEvent: %w", err)
}
}
// Now we know about this event, it was stored and the signatures were OK.
known[authEvent.EventID()] = &types.Event{
EventNID: eventNID,
Event: authEvent,
}
}
return nil
}
func (r *Inputer) calculateAndSetState(
ctx context.Context,
input *api.InputRoomEvent,
roomInfo *types.RoomInfo,
stateAtEvent *types.StateAtEvent,
event *gomatrixserverlib.Event,
isRejected bool,
) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "calculateAndSetState")
defer span.Finish()
var succeeded bool
updater, err := r.DB.GetRoomUpdater(ctx, roomInfo)
if err != nil {
return fmt.Errorf("r.DB.GetRoomUpdater: %w", err)
}
defer sqlutil.EndTransactionWithCheck(updater, &succeeded, &err)
roomState := state.NewStateResolution(updater, roomInfo)
if input.HasState {
// 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.
var entries []types.StateEntry
if entries, err = r.DB.StateEntriesForEventIDs(ctx, input.StateEventIDs); err != nil {
return fmt.Errorf("updater.StateEntriesForEventIDs: %w", err)
}
entries = types.DeduplicateStateEntries(entries)
if stateAtEvent.BeforeStateSnapshotNID, err = updater.AddState(ctx, roomInfo.RoomNID, nil, entries); err != nil {
return fmt.Errorf("updater.AddState: %w", err)
}
} else {
// 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 {
return fmt.Errorf("roomState.CalculateAndStoreStateBeforeEvent: %w", err)
}
}
err = updater.SetState(ctx, stateAtEvent.EventNID, stateAtEvent.BeforeStateSnapshotNID)
if err != nil {
return fmt.Errorf("r.DB.SetState: %w", err)
}
succeeded = true
return nil
}