public async Task <IReadOnlyList <Package> > FindPackagesOrNullAsync(string id, CancellationToken cancellationToken)
{
var items = await _upstreamClient.GetPackageMetadataAsync(id, cancellationToken);
if (!items.Any())
{
return(null);
}
var upstreamPackages = items.Select(ToPackage);
// Return the upstream packages if there are no local packages matching the package id.
var localPackages = await _localPackages.FindAsync(id, includeUnlisted : true);
if (!localPackages.Any())
{
return(upstreamPackages.ToList());
}
// Otherwise, merge the local packages into the upstream packages.
var result = upstreamPackages.ToDictionary(p => new PackageIdentity(p.Id, p.Version));
var local = localPackages.ToDictionary(p => new PackageIdentity(p.Id, p.Version));
foreach (var localPackage in local)
{
result[localPackage.Key] = localPackage.Value;
}
return(result.Values.ToList());
}
