graph/db: let ForEachNodeCached take a context

autopilot/graph.go

@@ -219,7 +219,7 @@ func (nc dbNodeCached) ForEachChannel(ctx context.Context,
 func (dc *databaseChannelGraphCached) ForEachNode(ctx context.Context,
 	cb func(context.Context, Node) error) error {
 
-	return dc.db.ForEachNodeCached(func(n route.Vertex,
+	return dc.db.ForEachNodeCached(ctx, func(n route.Vertex,
 		channels map[uint64]*graphdb.DirectedChannel) error {
 
 		if len(channels) > 0 {

autopilot/interface.go

@@ -234,6 +234,6 @@ type GraphSource interface {
 	// channel graph cache if one is available. It is less consistent than
 	// ForEachNode since any further calls are made across multiple
 	// transactions.
-	ForEachNodeCached(cb func(node route.Vertex,
+	ForEachNodeCached(ctx context.Context, cb func(node route.Vertex,
 		chans map[uint64]*graphdb.DirectedChannel) error) error
 }