Use synchronous contexts, limit time to fetch missing events

roomserver/internal/input/input.go

@@ -126,7 +126,7 @@ func (r *Inputer) InputRoomEvents(
 			inputRoomEvent := e
 			inbox, _ := r.workers.LoadOrStore(inputRoomEvent.Event.RoomID(), &phony.Inbox{})
 			inbox.(*phony.Inbox).Act(nil, func() {
-				err := r.processRoomEvent(context.TODO(), &inputRoomEvent)
+				err := r.processRoomEvent(ctx, &inputRoomEvent)
 				if err != nil {
 					sentry.CaptureException(err)
 				} else {
@@ -142,6 +142,7 @@ func (r *Inputer) InputRoomEvents(
 		for i := 0; i < len(request.InputRoomEvents); i++ {
 			select {
 			case <-ctx.Done():
+				response.ErrMsg = context.DeadlineExceeded.Error()
 				return
 			case err := <-responses:
 				if err != nil {

roomserver/internal/input/input_events.go

@@ -84,7 +84,7 @@ func (r *Inputer) processRoomEvent(
 	})
 
 	if input.Origin == "" {
-		input.Origin = event.Origin()
+		//	input.Origin = event.Origin()
 	}
 
 	logger.Println("XXX: Processing event")
@@ -131,17 +131,18 @@ func (r *Inputer) processRoomEvent(
 			return fmt.Errorf("r.FSAPI.QueryJoinedHostServerNamesInRoom: %w", err)
 		}
 	}
+	if input.Origin != "" {
+		serverRes.ServerNames = append([]gomatrixserverlib.ServerName{input.Origin}, serverRes.ServerNames...)
+	}
 
 	// 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{}
-	logger.Println("Starting to check for missing auth events")
 	if err = r.checkForMissingAuthEvents(ctx, logger, input.Event, &authEvents, knownEvents, serverRes.ServerNames); err != nil {
 		return fmt.Errorf("r.checkForMissingAuthEvents: %w", err)
 	}
-	logger.Println("Checked for missing auth events")
 
 	// 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.
@@ -172,6 +173,7 @@ func (r *Inputer) processRoomEvent(
 	}
 
 	if input.Kind != api.KindOutlier && len(missingRes.MissingPrevEventIDs) > 0 {
+		if len(serverRes.ServerNames) > 0 {
 			missingState := missingStateReq{
 				origin:     input.Origin,
 				inputer:    r,
@@ -180,7 +182,7 @@ func (r *Inputer) processRoomEvent(
 				federation: r.FSAPI,
 				keys:       r.KeyRing,
 				roomsMu:    internal.NewMutexByRoom(),
-			servers:    []gomatrixserverlib.ServerName{input.Origin},
+				servers:    serverRes.ServerNames,
 				hadEvents:  map[string]bool{},
 				haveEvents: map[string]*gomatrixserverlib.HeaderedEvent{},
 			}
@@ -188,6 +190,10 @@ func (r *Inputer) processRoomEvent(
 				isRejected = true
 				rejectionErr = fmt.Errorf("missingState.processEventWithMissingState: %w", err)
 			}
+		} else {
+			isRejected = true
+			rejectionErr = fmt.Errorf("missing prev events and no other servers to ask")
+		}
 	}
 
 	// Store the event.

roomserver/internal/input/input_missing.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"sync"
+	"time"
 
 	fedapi "github.com/matrix-org/dendrite/federationapi/api"
 	"github.com/matrix-org/dendrite/internal"
@@ -369,9 +370,10 @@ func (t *missingStateReq) getMissingEvents(ctx context.Context, e *gomatrixserve
 
 	var missingResp *gomatrixserverlib.RespMissingEvents
 	for _, server := range t.servers {
-		logger.Infof("Trying server %q for missing events", server)
 		var m gomatrixserverlib.RespMissingEvents
-		if m, err = t.federation.LookupMissingEvents(ctx, server, e.RoomID(), gomatrixserverlib.MissingEvents{
+		rctx, cancel := context.WithTimeout(ctx, time.Second*30)
+		defer cancel()
+		if m, err = t.federation.LookupMissingEvents(rctx, server, e.RoomID(), gomatrixserverlib.MissingEvents{
 			Limit: 20,
 			// The latest event IDs that the sender already has. These are skipped when retrieving the previous events of latest_events.
 			EarliestEvents: latestEvents,