private static async Task <string> GetOrCreateHostIdAsync(string sharedHostName, CloudBlobDirectory directory,
CancellationToken cancellationToken)
{
Debug.Assert(directory != null);
var blob = directory.SafeGetBlockBlobReference(sharedHostName);
Guid?possibleHostId = await TryGetExistingIdAsync(blob, cancellationToken);
if (possibleHostId.HasValue)
{
return(possibleHostId.Value.ToString("N"));
}
Guid newHostId = Guid.NewGuid();
if (await TryInitializeIdAsync(blob, newHostId, cancellationToken))
{
return(newHostId.ToString("N"));
}
possibleHostId = await TryGetExistingIdAsync(blob, cancellationToken);
if (possibleHostId.HasValue)
{
return(possibleHostId.Value.ToString("N"));
}
// Not expected - valid host ID didn't exist before, couldn't be created, and still didn't exist after.
throw new InvalidOperationException("Unable to determine host ID.");
}
public CloudBlockBlob CreateReference(string hostId, string functionId, string containerName,
string blobName, string eTag)
{
// Put the ETag before the blob name to prevent ambiguity since the blob name can contain embedded slashes.
string receiptName = String.Format(CultureInfo.InvariantCulture, "{0}/{1}/{2}/{3}/{4}", hostId, functionId,
eTag, containerName, blobName);
return(_directory.SafeGetBlockBlobReference(receiptName));
}
private static LocalBlobDescriptor CreateDescriptor(CloudBlobDirectory directory, string name)
{
var blob = directory.SafeGetBlockBlobReference(name);
return(new LocalBlobDescriptor
{
ContainerName = blob.Container.Name,
BlobName = blob.Name
});
}