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Fix concurrent map reads/writes on t.hadEvents (#1902)
* Fix concurrent map reads/writes on t.hadEvents * Add hadEvent function
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@ -232,7 +232,8 @@ type txnReq struct {
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// something that can tell us about which servers are in a room right now
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servers federationAPI.ServersInRoomProvider
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// a list of events from the auth and prev events which we already had
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hadEvents map[string]bool
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hadEvents map[string]bool
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hadEventsMutex sync.Mutex
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// local cache of events for auth checks, etc - this may include events
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// which the roomserver is unaware of.
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haveEvents map[string]*gomatrixserverlib.HeaderedEvent
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@ -240,6 +241,12 @@ type txnReq struct {
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work string // metrics
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}
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func (t *txnReq) hadEvent(eventID string, had bool) {
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t.hadEventsMutex.Lock()
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defer t.hadEventsMutex.Unlock()
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t.hadEvents[eventID] = had
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}
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// A subset of FederationClient functionality that txn requires. Useful for testing.
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type txnFederationClient interface {
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LookupState(ctx context.Context, s gomatrixserverlib.ServerName, roomID string, eventID string, roomVersion gomatrixserverlib.RoomVersion) (
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@ -595,10 +602,10 @@ func (t *txnReq) processEvent(ctx context.Context, e *gomatrixserverlib.Event) e
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// Prepare a map of all the events we already had before this point, so
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// that we don't send them to the roomserver again.
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for _, eventID := range append(e.AuthEventIDs(), e.PrevEventIDs()...) {
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t.hadEvents[eventID] = true
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t.hadEvent(eventID, true)
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}
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for _, eventID := range append(stateResp.MissingAuthEventIDs, stateResp.MissingPrevEventIDs...) {
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t.hadEvents[eventID] = false
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t.hadEvent(eventID, false)
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}
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if len(stateResp.MissingAuthEventIDs) > 0 {
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@ -673,7 +680,7 @@ withNextEvent:
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); err != nil {
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return fmt.Errorf("api.SendEvents: %w", err)
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}
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t.hadEvents[ev.EventID()] = true // if the roomserver didn't know about the event before, it does now
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t.hadEvent(ev.EventID(), true) // if the roomserver didn't know about the event before, it does now
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t.cacheAndReturn(ev.Headered(stateResp.RoomVersion))
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delete(missingAuthEvents, missingAuthEventID)
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continue withNextEvent
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@ -801,14 +808,23 @@ func (t *txnReq) processEventWithMissingState(
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// First of all, send the backward extremity into the roomserver with the
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// newly resolved state. This marks the "oldest" point in the backfill and
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// sets the baseline state for any new events after this.
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// sets the baseline state for any new events after this. We'll make a
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// copy of the hadEvents map so that it can be taken downstream without
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// worrying about concurrent map reads/writes, since t.hadEvents is meant
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// to be protected by a mutex.
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hadEvents := map[string]bool{}
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t.hadEventsMutex.Lock()
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for k, v := range t.hadEvents {
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hadEvents[k] = v
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}
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t.hadEventsMutex.Unlock()
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err = api.SendEventWithState(
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context.Background(),
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t.rsAPI,
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api.KindOld,
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resolvedState,
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backwardsExtremity.Headered(roomVersion),
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t.hadEvents,
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hadEvents,
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)
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if err != nil {
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return fmt.Errorf("api.SendEventWithState: %w", err)
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@ -904,7 +920,7 @@ func (t *txnReq) lookupStateAfterEventLocally(ctx context.Context, roomID, event
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// set the event from the haveEvents cache - this means we will share pointers with other prev_event branches for this
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// processEvent request, which is better for memory.
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stateEvents[i] = t.cacheAndReturn(ev)
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t.hadEvents[ev.EventID()] = true
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t.hadEvent(ev.EventID(), true)
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}
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// we should never access res.StateEvents again so we delete it here to make GC faster
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res.StateEvents = nil
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@ -939,7 +955,7 @@ func (t *txnReq) lookupStateAfterEventLocally(ctx context.Context, roomID, event
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}
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for i, ev := range queryRes.Events {
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authEvents = append(authEvents, t.cacheAndReturn(queryRes.Events[i]).Unwrap())
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t.hadEvents[ev.EventID()] = true
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t.hadEvent(ev.EventID(), true)
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}
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queryRes.Events = nil
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}
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@ -1016,7 +1032,7 @@ func (t *txnReq) getMissingEvents(ctx context.Context, e *gomatrixserverlib.Even
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latestEvents := make([]string, len(res.LatestEvents))
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for i, ev := range res.LatestEvents {
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latestEvents[i] = res.LatestEvents[i].EventID
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t.hadEvents[ev.EventID] = true
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t.hadEvent(ev.EventID, true)
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}
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var missingResp *gomatrixserverlib.RespMissingEvents
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@ -1152,7 +1168,7 @@ func (t *txnReq) lookupMissingStateViaStateIDs(ctx context.Context, roomID, even
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}
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for i, ev := range queryRes.Events {
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queryRes.Events[i] = t.cacheAndReturn(queryRes.Events[i])
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t.hadEvents[ev.EventID()] = true
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t.hadEvent(ev.EventID(), true)
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evID := queryRes.Events[i].EventID()
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if missing[evID] {
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delete(missing, evID)
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