private static string GenerateCacheKey(ServiceIndexEntry serviceEntry)
{
var index = serviceEntry.Type.IndexOf('/');
var version = serviceEntry.Type.Substring(index + 1).Trim();
return($"repository_signatures_{version}");
}
private static string GenerateCacheKey(ServiceIndexEntry serviceEntry)
{
#if NETCOREAPP
var index = serviceEntry.Type.IndexOf('/', StringComparison.Ordinal);
#else
var index = serviceEntry.Type.IndexOf('/');
#endif
var version = serviceEntry.Type.Substring(index + 1).Trim();
return($"repository_signatures_{version}");
}
private async Task <RepositorySignatureResource> GetRepositorySignatureResourceAsync(
SourceRepository source,
ServiceIndexEntry serviceEntry,
ILogger log,
CancellationToken token)
{
var repositorySignaturesResourceUri = serviceEntry.Uri;
if (repositorySignaturesResourceUri == null || !string.Equals(repositorySignaturesResourceUri.Scheme, "https", StringComparison.OrdinalIgnoreCase))
{
throw new FatalProtocolException(string.Format(CultureInfo.CurrentCulture, Strings.RepositorySignaturesResourceMustBeHttps, source.PackageSource.Source));
}
var httpSourceResource = await source.GetResourceAsync <HttpSourceResource>(token);
var client = httpSourceResource.HttpSource;
var cacheKey = GenerateCacheKey(serviceEntry);
const int maxRetries = 3;
for (var retry = 1; retry <= maxRetries; retry++)
{
using (var sourceCacheContext = new SourceCacheContext())
{
var cacheContext = HttpSourceCacheContext.Create(sourceCacheContext, isFirstAttempt: retry == 1);
try
{
return(await client.GetAsync(
new HttpSourceCachedRequest(
serviceEntry.Uri.AbsoluteUri,
cacheKey,
cacheContext)
{
EnsureValidContents = stream => HttpStreamValidation.ValidateJObject(repositorySignaturesResourceUri.AbsoluteUri, stream),
MaxTries = 1,
IsRetry = retry > 1,
IsLastAttempt = retry == maxRetries
},
async httpSourceResult =>
{
var json = await httpSourceResult.Stream.AsJObjectAsync(token);
return new RepositorySignatureResource(json, source);
},
log,
token));
}
catch (Exception ex) when(retry < maxRetries)
{
var message = string.Format(CultureInfo.CurrentCulture, Strings.Log_RetryingRepositorySignature, repositorySignaturesResourceUri.AbsoluteUri)
+ Environment.NewLine
+ ExceptionUtilities.DisplayMessage(ex);
log.LogMinimal(message);
}
catch (Exception ex) when(retry == maxRetries)
{
var message = string.Format(CultureInfo.CurrentCulture, Strings.Log_FailedToReadRepositorySignature, repositorySignaturesResourceUri.AbsoluteUri);
throw new FatalProtocolException(message, ex);
}
}
}
return(null);
}
