/// <summary>
/// Creates a new PackageCatalog.
/// </summary>
/// <param name="catalog">The address of the NuGet catalog endpoint.</param>
/// <param name="storage">The Storage object responsible for loading and saving the file.</param>
/// <param name="address">The storage resource URI to save the package to.</param>
/// <param name="nugetServiceUrls">The set of NuGet endpoints to use when determining if a package is the latest stable version.</param>
public PackageCatalog(Uri catalog, IStorage storage, Uri address, NugetServiceEndpoints nugetServiceUrls) : base(storage, address)
{
this.Catalog = catalog;
this.Packages = new SortedList<string, PackageInfo>();
this.NugetServiceUrls = nugetServiceUrls;
}
/// <summary>
/// Gets the latest stable version of this package
/// </summary>
/// <returns>The registration for the latest stable version of this package.</returns>
internal RegistrationIndexPackage GetLatestStableVersion(NugetServiceEndpoints nugetServiceUrls)
{
RegistrationIndex registrationIndex;
// Download the registration index for the package
using (WebClient client = new WebClient())
{
Uri registrationUrl = nugetServiceUrls.ComposeRegistrationUrl(this.PackageId);
string registrationIndexJson;
try
{
registrationIndexJson = client.DownloadString(registrationUrl);
}
catch (WebException we)
{
HttpWebResponse response = we.Response as HttpWebResponse;
if (response != null && response.StatusCode == HttpStatusCode.NotFound)
{
// If the page can't be found, there's not much we can do. Log the error and
// return null, indicating that we can't get the latest stable version for this package.
Trace.TraceError($"Could not download registration file for the package URL {registrationUrl}.");
return null;
}
else
{
// Any other error is likely an intermittent network issue, so we should rethrow.
throw;
}
}
registrationIndex = RegistrationIndex.Deserialize(registrationIndexJson);
}
return registrationIndex.GetLatestStableVersion();
}
