graphdb: pass context to GraphSession

routing/graph.go

@@ -32,7 +32,8 @@ type GraphSessionFactory interface {
 	// GraphSession will provide the call-back with access to a
 	// graphdb.NodeTraverser instance which can be used to perform queries
 	// against the channel graph.
-	GraphSession(cb func(graph graphdb.NodeTraverser) error,
+	GraphSession(ctx context.Context,
+		cb func(graph graphdb.NodeTraverser) error,
 		reset func()) error
 }