multi: let ForEachNodeChannel take a reset param

routing/localchans/manager.go

@@ -42,7 +42,7 @@ type Manager struct {
 	// channels. The ChannelEdgePolicy parameter may be nil.
 	ForAllOutgoingChannels func(ctx context.Context,
 		cb func(*models.ChannelEdgeInfo,
-			*models.ChannelEdgePolicy) error) error
+			*models.ChannelEdgePolicy) error, reset func()) error
 
 	// FetchChannel is used to query local channel parameters. Optionally an
 	// existing db tx can be supplied.
@@ -152,7 +152,14 @@ func (r *Manager) UpdatePolicy(ctx context.Context,
 	// Next, we'll loop over all the outgoing channels the router knows of.
 	// If we have a filter then we'll only collect those channels, otherwise
 	// we'll collect them all.
-	err := r.ForAllOutgoingChannels(ctx, processChan)
+	err := r.ForAllOutgoingChannels(
+		ctx, processChan,
+		func() {
+			failedUpdates = nil
+			edgesToUpdate = nil
+			clear(policiesToUpdate)
+		},
+	)
 	if err != nil {
 		return nil, err
 	}

routing/localchans/manager_test.go

@@ -125,7 +125,7 @@ func TestManager(t *testing.T) {
 
 	forAllOutgoingChannels := func(_ context.Context,
 		cb func(*models.ChannelEdgeInfo,
-			*models.ChannelEdgePolicy) error) error {
+			*models.ChannelEdgePolicy) error, _ func()) error {
 
 		for _, c := range channelSet {
 			if err := cb(c.edgeInfo, &currentPolicy); err != nil {