Copy blob between storage accounts

Question

I'm trying to copy a blob from one storage account to another (In a different location).

I'm using the following code:

var sourceContainer = sourceClient.GetContainerReference(containerId);
var sourceBlob = sourceContainer.GetBlockBlobReference(blobId);
if (await sourceBlob.ExistsAsync().ConfigureAwait(false))
{
    var targetContainer = targetClient.GetContainerReference(containerId);
    await targetContainer.CreateIfNotExistsAsync().ConfigureAwait(false);
    var targetBlob = targetContainer.GetBlockBlobReference(blobId);
    await targetBlob.DeleteIfExistsAsync().ConfigureAwait(false);
    await targetBlob.StartCopyAsync(sourceBlob).ConfigureAwait(false);
}

and I get a "Not Found" error. I do get that the source blob indeed exists. Am I using the wrong command? Is there something I'm missing regarding copying between storage accounts?

Answer 1

After playing around with the code, I reached an answer. Copying between storage accounts can only be achieved when the source blob is a uri and not a blob reference. The following code worked:

var sourceContainer = sourceClient.GetContainerReference(containerId);
var sourceBlob = sourceContainer.GetBlockBlobReference(blobId);
// Create a policy for reading the blob.
var policy = new SharedAccessBlobPolicy
{
    Permissions = SharedAccessBlobPermissions.Read,
    SharedAccessStartTime = DateTime.UtcNow.AddMinutes(-15),
    SharedAccessExpiryTime = DateTime.UtcNow.AddDays(7)
};
// Get SAS of that policy.
var sourceBlobToken = sourceBlob.GetSharedAccessSignature(policy);
// Make a full uri with the sas for the blob.
var sourceBlobSAS = string.Format("{0}{1}", sourceBlob.Uri, sourceBlobToken);
var targetContainer = targetClient.GetContainerReference(containerId);
await targetContainer.CreateIfNotExistsAsync().ConfigureAwait(false);
var targetBlob = targetContainer.GetBlockBlobReference(blobId);
await targetBlob.DeleteIfExistsAsync().ConfigureAwait(false);
await targetBlob.StartCopyAsync(new Uri(sourceBlobSAS)).ConfigureAwait(false);

Hope it will help someone in the future.

Answer 2

You can also copy blobs between storage accounts by using streams:

var sourceContainer = sourceClient.GetContainerReference(sourceContainer);
var sourceBlob = sourceContainer.GetBlockBlobReference(sourceBlobId);
var targetContainer = targetClient.GetContainerReference(destContainer);
var targetBlob = targetContainer.GetBlockBlobReference(destBlobId);

using (var targetBlobStream = await targetBlob.OpenWriteAsync())
{
    using (var sourceBlobStream = await sourceBlob.OpenReadAsync())
    {
        await sourceBlobStream.CopyToAsync(targetBlobStream);
    }
}