CODEWITHSUNDEEP
azureazure-blob-storageazure-storage-files
Pure.Krome
Pure.Krome

Reputation: 86937

How to copy an Azure File to an Azure Blob?

I've got some files sitting in an Azure File storage.

I'm trying to programatically archive them to Azure Blobs and I'm not sure how to do this efficiently.

I keep seeing code samples about copying from one blob container to another blob container .. but not from a File to a Blob.

Is it possible to do without downloading the entire File content locally and then uploading this content? Maybe use Uri's or something?

More Info:

  1. The File and Blob containers are in the same Storage account.
  2. The storage account is RA-GRS

Here was some sample code I was thinking of doing .. but it just doesn't feel right :( (pseudo code also .. with validation and checks omitted).

var file = await ShareRootDirectory.GetFileReference(fileName);
using (var stream = new MemoryStream())
{
    await file.DownloadToStreamAsync(stream);

    // Custom method that basically does:
    // 1. GetBlockBlobReference
    // 2. UploadFromStreamAsync
    await cloudBlob.AddItemAsync("some-container", stream);
}

Upvotes: 1

Views: 2686

Answers (2)

Zachary Schroeder
Zachary Schroeder

Reputation: 774

Use the Transfer Manager: https://msdn.microsoft.com/en-us/library/azure/microsoft.windowsazure.storage.datamovement.transfermanager_methods.aspx

There are methods to copy from CloudFile to CloudBlob.

Add the "Microsoft.Azure.Storage.DataMovement" nuget package

using Microsoft.WindowsAzure.Storage.Blob;
using Microsoft.WindowsAzure.Storage.File;
using Microsoft.WindowsAzure.Storage.DataMovement;

private string _storageConnectionString = "your_connection_string_here";

public async Task CopyFileToBlob(string blobContainer, string blobPath, string fileShare, string fileName)
{
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(_connectionString);
    CloudFileShare cloudFileShare = storageAccount.CreateCloudFileClient().GetShareReference(fileShare);
    CloudFile source = cloudFileShare.GetRootDirectoryReference().GetFileReference(fileName);

    CloudBlobContainer blobContainer = storageAccount.CreateCloudBlobClient().GetContainerReference(blobContainer);
    CloudBlockBlob target = blobContainer.GetBlockBlobReference(blobPath);

    await TransferManager.CopyAsync(source, target, true);
}

Upvotes: 1

Tom Sun
Tom Sun

Reputation: 24529

How to copy an Azure File to an Azure Blob?

We also can use CloudBlockBlob.StartCopy(CloudFile). CloudFile type is also can be accepted by the CloudBlockBlob.StartCopy function. How to copy CloudFile to blob please refer to document. The following demo code is snippet from the document.

// Parse the connection string for the storage account.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
    Microsoft.Azure.CloudConfigurationManager.GetSetting("StorageConnectionString"));

// Create a CloudFileClient object for credentialed access to File storage.
CloudFileClient fileClient = storageAccount.CreateCloudFileClient();

// Create a new file share, if it does not already exist.
CloudFileShare share = fileClient.GetShareReference("sample-share");
share.CreateIfNotExists();

// Create a new file in the root directory.
CloudFile sourceFile = share.GetRootDirectoryReference().GetFileReference("sample-file.txt");
sourceFile.UploadText("A sample file in the root directory.");

// Get a reference to the blob to which the file will be copied.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("sample-container");
container.CreateIfNotExists();
CloudBlockBlob destBlob = container.GetBlockBlobReference("sample-blob.txt");

// Create a SAS for the file that's valid for 24 hours.
// Note that when you are copying a file to a blob, or a blob to a file, you must use a SAS
// to authenticate access to the source object, even if you are copying within the same
// storage account.
string fileSas = sourceFile.GetSharedAccessSignature(new SharedAccessFilePolicy()
{
    // Only read permissions are required for the source file.
    Permissions = SharedAccessFilePermissions.Read,
    SharedAccessExpiryTime = DateTime.UtcNow.AddHours(24)
});

// Construct the URI to the source file, including the SAS token.
Uri fileSasUri = new Uri(sourceFile.StorageUri.PrimaryUri.ToString() + fileSas);

// Copy the file to the blob.
destBlob.StartCopy(fileSasUri);

Note:

If you are copying a blob to a file, or a file to a blob, you must use a shared access signature (SAS) to authenticate the source object, even if you are copying within the same storage account.

Upvotes: 4

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