graph/db: thread context through ForEachNodeDirectedChannel

routing/mock_graph_test.go

@@ -166,8 +166,9 @@ func (m *mockGraph) addChannel(id uint64, node1id, node2id byte,
 // forEachNodeChannel calls the callback for every channel of the given node.
 //
 // NOTE: Part of the Graph interface.
-func (m *mockGraph) ForEachNodeDirectedChannel(nodePub route.Vertex,
-	cb func(channel *graphdb.DirectedChannel) error, _ func()) error {
+func (m *mockGraph) ForEachNodeDirectedChannel(_ context.Context,
+	nodePub route.Vertex, cb func(channel *graphdb.DirectedChannel) error,
+	_ func()) error {
 
 	// Look up the mock node.
 	node, ok := m.nodes[nodePub]