private BlobReference[] WriteBlobs(
IReadOnlyCollection <Blob> blobs,
Fuzzy scanFuzzy,
Func <string, Stream> openRead)
{
var currentBlobReferences = _currentSnapshotId == null
? new Dictionary <string, BlobReference>()
: GetSnapshot(_currentSnapshotId.Value).BlobReferences
.ToDictionary(br => br.Name, br => br);
return(blobs
.AsParallel()
.Select(blob =>
{
currentBlobReferences.TryGetValue(
blob.Name,
out var current);
if (!scanFuzzy.IsMatch(blob.Name) &&
current != null &&
current.ToBlob().Equals(blob))
{
return current;
}
// Known blobs should be encrypted using the same nonce
var nonce = current?.Nonce
?? AesGcmCrypto.GenerateNonce();
using var stream = openRead(blob.Name);
var blobReference = new BlobReference(
blob.Name,
blob.LastWriteTimeUtc,
nonce,
WriteContent(nonce, stream));
_probe.StoredBlob(blobReference);
return blobReference;
})
.OrderBy(blobReference => blobReference.Name)
.ToArray());
}