public void CloudBlobSnapshot()
{
CloudBlobContainer container = GetRandomContainerReference();
try
{
container.Create();
// Upload some data to the blob.
var blobName = GetRandomBlobName();
MemoryStream originalData = new MemoryStream(GetRandomBuffer(1024));
CloudAppendBlob appendBlob = container.GetAppendBlobReference(blobName);
appendBlob.CreateOrReplace();
appendBlob.AppendBlock(originalData, null);
CloudBlob blob = container.GetBlobReference(blobName);
blob.FetchAttributes();
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 = blob.Snapshot();
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 = blob.Snapshot();
Assert.IsTrue(snapshot2.SnapshotTime.Value > snapshot1.SnapshotTime.Value);
snapshot1.FetchAttributes();
snapshot2.FetchAttributes();
blob.FetchAttributes();
AssertAreEqual(snapshot1.Properties, blob.Properties, false);
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);
snapshot1Clone.FetchAttributes();
AssertAreEqual(snapshot1.Properties, snapshot1Clone.Properties, false);
// The query parser should not be case sensitive in detecting a snapshot in the query string
CloudBlob snapshotParseVerifier = new CloudBlob(new Uri(blob.Uri + "?sNapshOt=" + snapshot1.SnapshotTime.Value.ToString("O")), blob.ServiceClient.Credentials);
Assert.IsNotNull(snapshotParseVerifier.SnapshotTime, "Snapshot parse verifier did not successfully detect the snapshot time");
Assert.AreEqual(snapshot1.SnapshotTime.Value, snapshotParseVerifier.SnapshotTime.Value);
CloudBlob snapshotCopy = container.GetBlobReference("blob2");
snapshotCopy.StartCopy(TestHelper.Defiddler(snapshot1.Uri));
WaitForCopy(snapshotCopy);
Assert.AreEqual(CopyStatus.Success, snapshotCopy.CopyState.Status);
using (Stream snapshotStream = snapshot1.OpenRead())
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
//overwriting the blob and creating the 5th snapshot
appendBlob.CreateOrReplace();
blob.FetchAttributes();
using (Stream snapshotStream = snapshot1.OpenRead())
{
snapshotStream.Seek(0, SeekOrigin.End);
TestHelper.AssertStreamsAreEqual(originalData, snapshotStream);
}
List <IListBlobItem> blobs = container.ListBlobs(null, true, BlobListingDetails.All, null, null).ToList();
Assert.AreEqual(4, blobs.Count);
AssertAreEqual(snapshotCopy, (CloudBlob)blobs[0]);
AssertAreEqual(snapshot1, (CloudBlob)blobs[1]);
AssertAreEqual(snapshot2, (CloudBlob)blobs[2]);
AssertAreEqual(blob, (CloudBlob)blobs[3]);
}
finally
{
container.DeleteIfExists();
}
}
