public async Task <HttpResponseMessage> DeleteBlob(string container, string blob, string snapshot = null)
{
var requestWrapper = DashHttpRequestWrapper.Create(this.Request);
var headers = requestWrapper.Headers;
var queryParams = requestWrapper.QueryParameters;
bool dataBlobDeleted = false;
return(await DoHandlerAsync(String.Format("BlobController.DeleteBlob: {0}/{1}", container, blob),
async() => await NamespaceHandler.PerformNamespaceOperation(container, blob, async(namespaceBlob) =>
{
// We only need to delete the actual blob. We are leaving the namespace entry alone as a sort of cache.
if (!(await namespaceBlob.ExistsAsync()) || namespaceBlob.IsMarkedForDeletion)
{
return this.CreateResponse(HttpStatusCode.NotFound, headers);
}
// Delete the real data blob by forwarding the request onto the data account
if (!dataBlobDeleted)
{
var forwardedResponse = await ForwardRequestHandler(namespaceBlob, StorageOperationTypes.DeleteBlob);
if (!forwardedResponse.IsSuccessStatusCode)
{
return forwardedResponse;
}
dataBlobDeleted = true;
}
// See if we need to delete any replicas
if (namespaceBlob.IsReplicated)
{
await BlobReplicationHandler.EnqueueBlobReplicationAsync(namespaceBlob, true, false);
}
// Mark the namespace blob for deletion
await namespaceBlob.MarkForDeletionAsync();
return this.CreateResponse(HttpStatusCode.Accepted, headers);
})));
}
static void CleanupAbortedBlobReplication(ICloudBlob destBlob)
{
if (destBlob == null)
{
return;
}
NamespaceHandler.PerformNamespaceOperation(destBlob.Container.Name, destBlob.Name, async(namespaceBlob) =>
{
if (CleanupAbortedBlobReplication(namespaceBlob, destBlob))
{
await namespaceBlob.SaveAsync();
return(true);
}
return(false);
}).Wait();
}
static bool FinalizeBlobReplication(string dataAccount, string container, string blobName, bool deleteReplica, ICloudBlob destBlob = null)
{
return(NamespaceHandler.PerformNamespaceOperation(container, blobName, async(namespaceBlob) =>
{
bool exists = await namespaceBlob.ExistsAsync();
if (!exists || namespaceBlob.IsMarkedForDeletion)
{
// It's ok for a deleted replica not to have a corresponding namespace blob
if (!deleteReplica)
{
DashTrace.TraceWarning("Replication of blob [{0}] to account [{1}] cannot be completed because the namespace blob either does not exist or is marked for deletion.",
PathUtils.CombineContainerAndBlob(container, blobName),
dataAccount);
// Attempt to not leave the replica orphaned
if (CleanupAbortedBlobReplication(namespaceBlob, destBlob))
{
await namespaceBlob.SaveAsync();
}
}
// Do not attempt retry in this state
return true;
}
string message = "replicated to";
bool nsDirty = false;
if (deleteReplica)
{
nsDirty = namespaceBlob.RemoveDataAccount(dataAccount);
message = "dereplicated from";
}
else
{
nsDirty = namespaceBlob.AddDataAccount(dataAccount);
}
if (nsDirty)
{
await namespaceBlob.SaveAsync();
DashTrace.TraceInformation("Blob [{0}] has been successfully {1} account [{2}].",
PathUtils.CombineContainerAndBlob(container, blobName),
message,
dataAccount);
}
return true;
}).Result);
}