public static CloudBlob GetCorrespondingTypeBlobReference(CloudBlob blob)
{
CloudBlob targetBlob;
switch(blob.Properties.BlobType)
{
case BlobType.BlockBlob:
targetBlob = new CloudBlockBlob(blob.SnapshotQualifiedUri, blob.ServiceClient.Credentials);
break;
case BlobType.PageBlob:
targetBlob = new CloudPageBlob(blob.SnapshotQualifiedUri, blob.ServiceClient.Credentials);
break;
case BlobType.AppendBlob:
targetBlob = new CloudAppendBlob(blob.SnapshotQualifiedUri, blob.ServiceClient.Credentials);
break;
default:
throw new InvalidOperationException(string.Format(
CultureInfo.CurrentCulture,
Resources.InvalidBlobType,
blob.Properties.BlobType,
blob.Name));
}
targetBlob.FetchAttributes();
return targetBlob;
}
public void CloudAppendBlobSnapshot()
{
CloudBlobContainer container = GetRandomContainerReference();
try
{
container.Create();
MemoryStream originalData = new MemoryStream(GetRandomBuffer(1024));
CloudAppendBlob blob = container.GetAppendBlobReference("blob1");
blob.CreateOrReplace();
blob.AppendBlock(originalData, null);
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);
CloudAppendBlob snapshot1 = blob.CreateSnapshot();
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"));
CloudAppendBlob snapshot2 = blob.CreateSnapshot();
Assert.IsTrue(snapshot2.SnapshotTime.Value > snapshot1.SnapshotTime.Value);
snapshot1.FetchAttributes();
snapshot2.FetchAttributes();
blob.FetchAttributes();
AssertAreEqual(snapshot1.Properties, blob.Properties, false);
CloudAppendBlob snapshot1Clone = new CloudAppendBlob(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);
CloudAppendBlob snapshotCopy = container.GetAppendBlobReference("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);
}
blob.CreateOrReplace();
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(snapshot1, (CloudBlob)blobs[0]);
AssertAreEqual(snapshot2, (CloudBlob)blobs[1]);
AssertAreEqual(blob, (CloudBlob)blobs[2]);
AssertAreEqual(snapshotCopy, (CloudBlob)blobs[3]);
}
finally
{
container.DeleteIfExists();
}
}
