private async Task <SortedDictionary <NuGetVersion, PackageInfo> > FindPackagesByIdAsync(string id, CancellationToken cancellationToken)
{
for (var retry = 0; retry != 3; ++retry)
{
var baseUri = _baseUris[retry % _baseUris.Count].OriginalString;
var uri = baseUri + id.ToLowerInvariant() + "/index.json";
try
{
using (var result = await _httpSource.GetAsync(
uri,
$"list_{id}",
CreateCacheContext(retry),
Logger,
ignoreNotFounds: true,
ensureValidContents: stream => HttpStreamValidation.ValidateJObject(uri, stream),
cancellationToken: cancellationToken))
{
if (result.Status == HttpSourceResultStatus.NotFound)
{
return(new SortedDictionary <NuGetVersion, PackageInfo>());
}
try
{
return(ConsumeFlatContainerIndex(result.Stream, id, baseUri));
}
catch
{
Logger.LogWarning(string.Format(CultureInfo.CurrentCulture, Strings.Log_FileIsCorrupt, result.CacheFileName));
throw;
}
}
}
catch (Exception ex) when(retry < 2)
{
var message = string.Format(CultureInfo.CurrentCulture, Strings.Log_RetryingFindPackagesById, nameof(FindPackagesByIdAsync), uri)
+ Environment.NewLine
+ ExceptionUtilities.DisplayMessage(ex);
Logger.LogMinimal(message);
}
catch (Exception ex) when(retry == 2)
{
var message = string.Format(CultureInfo.CurrentCulture, Strings.Log_FailedToRetrievePackage, uri);
Logger.LogError(message + Environment.NewLine + ExceptionUtilities.DisplayMessage(ex));
throw new FatalProtocolException(message, ex);
}
}
return(null);
}
public void HttpStreamValidation_ValidateJObject_AcceptsMinimal()
{
// Arrange
var stream = new MemoryStream(Encoding.UTF8.GetBytes(@"
{
""foo"": 1,
""bar"": 2
}"));
// Act & Assert
HttpStreamValidation.ValidateJObject(Uri, stream);
}
public void HttpStreamValidation_ValidateJObject_RejectsJsonArray()
{
// Arrange
var stream = new MemoryStream(Encoding.UTF8.GetBytes("[1, 2]"));
// Act & Assert
var actual = Assert.Throws <InvalidDataException>(() =>
{
HttpStreamValidation.ValidateJObject(Uri, stream);
});
Assert.IsType <JsonReaderException>(actual.InnerException);
}
public void HttpStreamValidation_ValidateJObject_RejectsIncompleteJsonObjects()
{
// Arrange
var stream = new MemoryStream(Encoding.UTF8.GetBytes(@"
{
""foo"": 1,
""bar"": 2"));
// Act & Assert
var actual = Assert.Throws <InvalidDataException>(() =>
{
HttpStreamValidation.ValidateJObject(Uri, stream);
});
Assert.IsType <JsonReaderException>(actual.InnerException);
}