/// <summary>
/// Retrieves the current USD to hBar exchange rate information from the
/// network.
/// </summary>
/// <remarks>
/// NOTE: this method incours a charge to retrieve the file from the network.
/// </remarks>
/// <param name="client">Client Object</param>
/// <param name="configure">
/// Optional callback method providing an opportunity to modify
/// the execution configuration for just this method call.
/// It is executed prior to submitting the request to the network.
/// </param>
/// <returns>
/// An Exchange Rates object providing the current and next
/// exchange rates.
/// </returns>
public static async Task <NodeInfo[]> GetAddressBookAsync(this Client client, Action <IContext>?configure = null)
{
var file = await client.GetFileContentAsync(ADDRESS_BOOK_FILE_ADDRESS, configure);
var book = Proto.NodeAddressBook.Parser.ParseFrom(file.ToArray());
return(Protobuf.FromNodeAddressBook(book));
}