public static bool AddNode(IConnectionManager connectionManager, IPeerBanning peerBanning, string endpointStr, string command)
        {
            IPEndPoint endpoint = endpointStr.ToIPEndPoint(connectionManager.Network.DefaultPort);

            switch (command)
            {
            case "add":
                if (peerBanning.IsBanned(endpoint))
                {
                    throw new InvalidOperationException("Can't perform 'add' for a banned peer.");
                }

                connectionManager.AddNodeAddress(endpoint);
                break;

            case "remove":
                connectionManager.RemoveNodeAddress(endpoint);
                break;

            case "onetry":
                if (peerBanning.IsBanned(endpoint))
                {
                    throw new InvalidOperationException("Can't connect to a banned peer.");
                }

                connectionManager.ConnectAsync(endpoint).GetAwaiter().GetResult();
                break;

            default:
                throw new ArgumentException("command");
            }

            return(true);
        }