public async Task CloudBlobSnapshotAsync()
{
CloudBlobContainer container = GetRandomContainerReference();
try
{
await container.CreateAsync();
MemoryStream originalData = new MemoryStream(GetRandomBuffer(1024));
CloudAppendBlob appendBlob = container.GetAppendBlobReference(BlobName);
await appendBlob.CreateOrReplaceAsync();
await appendBlob.AppendBlockAsync(originalData, null);
CloudBlob blob = container.GetBlobReference(BlobName);
await blob.FetchAttributesAsync();
Assert.IsFalse(blob.IsSnapshot);
Assert.IsNull(blob.SnapshotTime, "Root blob has SnapshotTime set");
Assert.IsFalse(blob.SnapshotQualifiedUri.Query.Contains("snapshot"));
Assert.AreEqual(blob.Uri, blob.SnapshotQualifiedUri);
CloudBlob snapshot1 = await blob.SnapshotAsync();
Assert.AreEqual(blob.Properties.ETag, snapshot1.Properties.ETag);
Assert.AreEqual(blob.Properties.LastModified, snapshot1.Properties.LastModified);
Assert.IsTrue(snapshot1.IsSnapshot);
Assert.IsNotNull(snapshot1.SnapshotTime, "Snapshot does not have SnapshotTime set");
Assert.AreEqual(blob.Uri, snapshot1.Uri);
Assert.AreNotEqual(blob.SnapshotQualifiedUri, snapshot1.SnapshotQualifiedUri);
Assert.AreNotEqual(snapshot1.Uri, snapshot1.SnapshotQualifiedUri);
Assert.IsTrue(snapshot1.SnapshotQualifiedUri.Query.Contains("snapshot"));
CloudBlob snapshot2 = await blob.SnapshotAsync();
Assert.IsTrue(snapshot2.SnapshotTime.Value > snapshot1.SnapshotTime.Value);
await snapshot1.FetchAttributesAsync();
await snapshot2.FetchAttributesAsync();
await blob.FetchAttributesAsync();
AssertAreEqual(snapshot1.Properties, blob.Properties);
CloudBlob snapshot1Clone = new CloudBlob(new Uri(blob.Uri + "?snapshot=" + snapshot1.SnapshotTime.Value.ToString("O")), blob.ServiceClient.Credentials);
Assert.IsNotNull(snapshot1Clone.SnapshotTime, "Snapshot clone does not have SnapshotTime set");
Assert.AreEqual(snapshot1.SnapshotTime.Value, snapshot1Clone.SnapshotTime.Value);
await snapshot1Clone.FetchAttributesAsync();
AssertAreEqual(snapshot1.Properties, snapshot1Clone.Properties, false);
CloudAppendBlob snapshotCopy = container.GetAppendBlobReference("blob2");
await snapshotCopy.StartCopyAsync((TestHelper.Defiddler(snapshot1.Uri)));
await WaitForCopyAsync(snapshotCopy);
Assert.AreEqual(CopyStatus.Success, snapshotCopy.CopyState.Status);
using (Stream snapshotStream = (await snapshot1.OpenReadAsync()))
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
await appendBlob.CreateOrReplaceAsync();
await appendBlob.FetchAttributesAsync(); // This is needed as cache settings are not updated with create call above.
await blob.FetchAttributesAsync();
using (Stream snapshotStream = (await snapshot1.OpenReadAsync()))
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
BlobResultSegment resultSegment = await container.ListBlobsSegmentedAsync(null, true, BlobListingDetails.All, null, null, null, null);
List <IListBlobItem> blobs = resultSegment.Results.ToList();
Assert.AreEqual(4, blobs.Count);
AssertAreEqual(snapshot1, (CloudBlob)blobs[0]);
AssertAreEqual(snapshot2, (CloudBlob)blobs[1]);
AssertAreEqual(appendBlob, (CloudBlob)blobs[2]);
AssertAreEqual(snapshotCopy, (CloudBlob)blobs[3]);
}
finally
{
container.DeleteIfExistsAsync().Wait();
}
}