/// <summary>
/// calling graph is prepared for update contract code (check for DAG at that time)
/// </summary>
/// <param name="edges"></param>
/// <returns></returns>
/// <exception cref="FunctionMetadataException"></exception>
private CallGraph BuildCallingGraph(SerializedCallGraph callGraph)
{
CallGraph graph = new CallGraph();
graph.AddVertexRange(callGraph.Vertices);
graph.AddEdgeRange(callGraph.Edges.Select(serializedEdge =>
new Edge <string>(serializedEdge.Source, serializedEdge.Target)));
try
{
graph.TopologicalSort();
}
catch (NonAcyclicGraphException)
{
throw new FunctionMetadataException("The calling graph ISNOT DAG when restoring the calling graph according to the ContractMetadataTemplateMap from the database");
}
return(graph);
}