/// <summary>
/// Downloads the available data files from the QAS Electronic Updates Metadata REST API as an asynchronous operation.
/// </summary>
/// <returns>
/// A <see cref="Task"/> representing the asynchronous operation to download any data files.
/// </returns>
internal static async Task MainAsync()
{
PrintBanner();
// Get the configuration settings for downloading files
string downloadRootPath = MetadataApiFactory.GetAppSetting("DownloadRootPath");
string verifyDownloadsString = MetadataApiFactory.GetAppSetting("ValidateDownloads");
bool verifyDownloads;
if (!bool.TryParse(verifyDownloadsString, out verifyDownloads))
{
verifyDownloads = true;
}
if (string.IsNullOrEmpty(downloadRootPath))
{
downloadRootPath = "QASData";
}
downloadRootPath = Path.GetFullPath(downloadRootPath);
// Create the service implementation
IMetadataApiFactory factory = new MetadataApiFactory();
IMetadataApi service = factory.CreateMetadataApi();
Console.WriteLine("QAS Electronic Updates Metadata REST API: {0}", service.ServiceUri);
Console.WriteLine();
Console.WriteLine("User Name: {0}", service.UserName);
Console.WriteLine();
// Query the packages available to the account
AvailablePackagesReply response = await service.GetAvailablePackagesAsync();
Console.WriteLine("Available Package Groups:");
Console.WriteLine();
// Enumerate the package groups and list their packages and files
if (response.PackageGroups != null && response.PackageGroups.Count > 0)
{
using (CancellationTokenSource tokenSource = new CancellationTokenSource())
{
// Cancel the tasks if Ctrl+C is entered to the console
Console.CancelKeyPress += (sender, e) =>
{
if (!tokenSource.IsCancellationRequested)
{
tokenSource.Cancel();
}
e.Cancel = true;
};
try
{
Stopwatch stopwatch = Stopwatch.StartNew();
// Create a file store in which to cache information about which files
// have already been downloaded from the Metadata API service.
using (IFileStore fileStore = new LocalFileStore())
{
foreach (PackageGroup group in response.PackageGroups)
{
Console.WriteLine("Group Name: {0} ({1})", group.PackageGroupCode, group.Vintage);
Console.WriteLine();
Console.WriteLine("Packages:");
Console.WriteLine();
foreach (Package package in group.Packages)
{
Console.WriteLine("Package Name: {0}", package.PackageCode);
Console.WriteLine();
Console.WriteLine("Files:");
Console.WriteLine();
foreach (DataFile file in package.Files)
{
if (fileStore.ContainsFile(file.MD5Hash))
{
// We already have this file, download not required
Console.WriteLine("File with hash '{0}' already downloaded.", file.MD5Hash);
}
else
{
// Download the file
await DownloadFileAsync(
service,
fileStore,
group,
file,
downloadRootPath,
verifyDownloads,
tokenSource.Token);
}
}
Console.WriteLine();
}
Console.WriteLine();
}
}
stopwatch.Stop();
Console.WriteLine("Downloaded data in {0:hh\\:mm\\:ss}.", stopwatch.Elapsed);
}
catch (OperationCanceledException ex)
{
// Only an error if not cancelled by the user
if (ex.CancellationToken != tokenSource.Token)
{
throw;
}
Console.WriteLine("File download cancelled by user.");
}
Console.WriteLine();
}
}
}
