/// <summary>
/// Generic function to redirect a put request for properties of a blob
/// </summary>
public static async Task <HandlerResult> BasicBlobAsync(IHttpRequestWrapper requestWrapper, string container, string blob, bool servePrimaryOnly, bool operationCanReplicateBlob)
{
return(await WebOperationRunner.DoHandlerAsync("BlobHandler.BasicBlobAsync", async() =>
{
var namespaceBlob = await NamespaceHandler.FetchNamespaceBlobAsync(container, blob);
if (!await namespaceBlob.ExistsAsync())
{
return new HandlerResult
{
StatusCode = HttpStatusCode.NotFound,
};
}
string accountName = namespaceBlob.SelectDataAccount(servePrimaryOnly);
if (operationCanReplicateBlob)
{
if (namespaceBlob.IsReplicated ||
BlobReplicationHandler.ShouldReplicateBlob(requestWrapper.Headers, container, blob))
{
accountName = namespaceBlob.PrimaryAccountName;
await BlobReplicationHandler.EnqueueBlobReplicationAsync(namespaceBlob, false);
}
}
Uri redirect = ControllerOperations.GetRedirectUri(HttpContextFactory.Current.Request,
DashConfiguration.GetDataAccountByAccountName(accountName),
namespaceBlob.Container,
namespaceBlob.BlobName,
false);
return HandlerResult.Redirect(requestWrapper, redirect);
}));
}
protected async Task <HttpResponseMessage> DoHandlerAsync(string handlerName, Func <Task <HttpResponseMessage> > handler)
{
return(await WebOperationRunner.DoActionAsync(handlerName, handler, (ex) =>
{
return ProcessResultResponse(HandlerResult.FromException(ex));
}));
}
async Task PreRequestHandlerExecuteAsync(Object sender, EventArgs e)
{
// Insert handling here for any requests which can potentially contain a body and that we intend to redirect. We must
// process the request here because if the client is using the Expect: 100-Continue header, then we should issue our
// final (redirect) status BEFORE IIS sends the 100 Continue response. This way the blob content is never sent to us.
var result = await WebOperationRunner.DoHandlerAsync("App.PreRequestHandlerExecuteAsync",
async() => await StorageOperationsHandler.HandlePrePipelineOperationAsync(DashHttpRequestWrapper.Create(this.Request, true)));
if (result != null)
{
switch (result.StatusCode)
{
case HttpStatusCode.Redirect:
this.Response.Redirect(result.Location, false);
if (!String.IsNullOrWhiteSpace(result.SignedLocation))
{
this.Response.AppendHeader("x-ms-redirect-signature", result.SignedLocation);
}
if (result.Headers != null)
{
foreach (var header in result.Headers
.SelectMany(headerGroup => headerGroup
.Select(headerItem => Tuple.Create(headerGroup.Key, headerItem))))
{
this.Response.AppendHeader(header.Item1, header.Item2);
}
}
break;
case HttpStatusCode.NotFound:
this.Response.StatusCode = (int)HttpStatusCode.NotFound;
this.Response.StatusDescription = "The specified blob does not exist.";
this.Response.ContentType = "application/xml";
this.Response.Write(String.Format(@"
<?xml version='1.0' encoding='utf-8'?>
<Error>
<Code>BlobNotFound</Code>
<Message>The specified blob does not exist.\n Time:{0:o}</Message>
</Error>", DateTime.UtcNow));
break;
default:
System.Diagnostics.Debug.Assert(false);
this.Response.StatusCode = (int)result.StatusCode;
break;
}
this.CompleteRequest();
}
}
public static async Task <HandlerResult> AbortCopyBlobAsync(IHttpRequestWrapper requestWrapper, string destContainer, string destBlob, string copyId)
{
return(await WebOperationRunner.DoHandlerAsync("BlobHandler.AbortCopyBlobAsync", async() =>
{
var destNamespaceBlob = await NamespaceHandler.FetchNamespaceBlobAsync(destContainer, destBlob);
var destCloudBlob = NamespaceHandler.GetBlobByName(
DashConfiguration.GetDataAccountByAccountName(destNamespaceBlob.PrimaryAccountName),
destContainer,
destBlob);
await destCloudBlob.AbortCopyAsync(copyId);
return new HandlerResult
{
StatusCode = HttpStatusCode.NoContent,
};
}));
}
public static async Task <HandlerResult> PutBlobAsync(IHttpRequestWrapper requestWrapper, string container, string blob, bool operationCanReplicateBlob)
{
return(await WebOperationRunner.DoHandlerAsync("BlobHandler.PutBlobAsync", async() =>
{
var namespaceBlob = await NamespaceHandler.CreateNamespaceBlobAsync(container, blob);
if (operationCanReplicateBlob)
{
if (BlobReplicationHandler.ShouldReplicateBlob(requestWrapper.Headers, container, blob))
{
await BlobReplicationHandler.EnqueueBlobReplicationAsync(namespaceBlob, false);
}
}
Uri redirect = ControllerOperations.GetRedirectUri(HttpContextFactory.Current.Request,
DashConfiguration.GetDataAccountByAccountName(namespaceBlob.PrimaryAccountName),
container,
blob,
false);
return HandlerResult.Redirect(requestWrapper, redirect);
}));
}
public static async Task <HandlerResult> CopyBlobAsync(IHttpRequestWrapper requestWrapper, string destContainer, string destBlob, string source)
{
return(await WebOperationRunner.DoHandlerAsync(String.Format("BlobHandler.CopyBlobAsync: {0}/{1} from {2}", destContainer, destBlob, source), async() =>
{
// source is a naked URI supplied by client
Uri sourceUri;
if (Uri.TryCreate(source, UriKind.RelativeOrAbsolute, out sourceUri))
{
string sourceContainer = String.Empty;
string sourceBlobName = String.Empty;
string sourceQuery = String.Empty;
BlobType sourceBlobType = BlobType.BlockBlob;
var requestVersion = requestWrapper.Headers.Value("x-ms-version", StorageServiceVersions.Version_2009_09_19);
bool processRelativeSource = false;
if (!sourceUri.IsAbsoluteUri)
{
if (requestVersion >= StorageServiceVersions.Version_2012_02_12)
{
// 2012-02-12 onwards doesn't accept relative URIs
return new HandlerResult
{
StatusCode = HttpStatusCode.BadRequest,
};
}
// Make sourceUri absolute here because a bunch of Uri functionality fails for relative URIs
sourceUri = new Uri(new Uri("http://dummyhost"), sourceUri);
processRelativeSource = true;
}
if (processRelativeSource ||
(String.Equals(sourceUri.Host, requestWrapper.Url.Host, StringComparison.OrdinalIgnoreCase) &&
((sourceUri.IsDefaultPort && requestWrapper.Url.IsDefaultPort) || (sourceUri.Port == requestWrapper.Url.Port))))
{
var segments = PathUtils.GetPathSegments(sourceUri.AbsolutePath);
if (processRelativeSource)
{
// Blob in named container: /accountName/containerName/blobName
// Snapshot in named container: /accountName/containerName/blobName?snapshot=<DateTime>
// Blob in root container: /accountName/blobName
// Snapshot in root container: /accountName/blobName?snapshot=<DateTime>
if (!String.Equals(segments.FirstOrDefault(), DashConfiguration.AccountName))
{
return new HandlerResult
{
StatusCode = HttpStatusCode.BadRequest,
ErrorInformation = new DashErrorInformation
{
ErrorCode = "CopyAcrossAccountsNotSupported",
ErrorMessage = "The copy source account and destination account must be the same.",
},
};
}
if (segments.Count() == 2)
{
sourceContainer = "root";
sourceBlobName = segments[1];
}
else if (segments.Count() > 2)
{
sourceContainer = segments[1];
sourceBlobName = PathUtils.CombinePathSegments(segments.Skip(2));
}
}
else
{
sourceContainer = segments.FirstOrDefault();
sourceBlobName = PathUtils.CombinePathSegments(segments.Skip(1));
}
}
var destNamespaceBlob = await NamespaceHandler.FetchNamespaceBlobAsync(destContainer, destBlob);
string destAccount = String.Empty;
if (!String.IsNullOrEmpty(sourceContainer) && !String.IsNullOrEmpty(sourceBlobName))
{
var sourceQueryParams = HttpUtility.ParseQueryString(sourceUri.Query);
var sourceNamespaceBlob = await NamespaceHandler.FetchNamespaceBlobAsync(sourceContainer, sourceBlobName, sourceQueryParams["snapshot"]);
if (!await sourceNamespaceBlob.ExistsAsync())
{
// This isn't actually documented (what happens when the source doesn't exist), but by obervation the service emits 404
return new HandlerResult
{
StatusCode = HttpStatusCode.NotFound,
};
}
var sourceCloudContainer = NamespaceHandler.GetContainerByName(
DashConfiguration.GetDataAccountByAccountName(sourceNamespaceBlob.PrimaryAccountName), sourceContainer);
sourceBlobType = sourceCloudContainer.GetBlobReferenceFromServer(sourceBlobName).BlobType;
// This is effectively an intra-account copy which is expected to be atomic. Therefore, even if the destination already
// exists, we need to place the destination in the same data account as the source.
// If the destination blob already exists, we delete it below to prevent an orphaned data blob
destAccount = sourceNamespaceBlob.PrimaryAccountName;
var sourceUriBuilder = ControllerOperations.GetRedirectUriBuilder("GET",
requestWrapper.Url.Scheme,
DashConfiguration.GetDataAccountByAccountName(destAccount),
sourceContainer,
sourceBlobName,
false,
String.Empty);
sourceUri = sourceUriBuilder.Uri;
}
else if (await destNamespaceBlob.ExistsAsync())
{
destAccount = destNamespaceBlob.PrimaryAccountName;
}
else
{
destAccount = NamespaceHandler.GetDataStorageAccountForBlob(destBlob).Credentials.AccountName;
}
bool replicateDestination = false;
if (await destNamespaceBlob.ExistsAsync() && destNamespaceBlob.PrimaryAccountName != destAccount)
{
// Delete the existing blob to prevent orphaning it
replicateDestination = destNamespaceBlob.IsReplicated;
var dataBlob = NamespaceHandler.GetBlobByName(
DashConfiguration.GetDataAccountByAccountName(destNamespaceBlob.PrimaryAccountName), destContainer, destBlob);
await dataBlob.DeleteIfExistsAsync();
}
destNamespaceBlob.PrimaryAccountName = destAccount;
destNamespaceBlob.Container = destContainer;
destNamespaceBlob.BlobName = destBlob;
destNamespaceBlob.IsMarkedForDeletion = false;
await destNamespaceBlob.SaveAsync();
// Now that we've got the metadata tucked away - do the actual copy
var destCloudContainer = NamespaceHandler.GetContainerByName(DashConfiguration.GetDataAccountByAccountName(destAccount), destContainer);
ICloudBlob destCloudBlob = null;
if (sourceBlobType == BlobType.PageBlob)
{
destCloudBlob = destCloudContainer.GetPageBlobReference(destBlob);
}
else
{
destCloudBlob = destCloudContainer.GetBlockBlobReference(destBlob);
}
// Storage client will retry failed copy. Let our clients decide that.
var copyId = await destCloudBlob.StartCopyFromBlobAsync(sourceUri,
AccessCondition.GenerateEmptyCondition(),
AccessCondition.GenerateEmptyCondition(),
new BlobRequestOptions
{
RetryPolicy = new NoRetry(),
},
new OperationContext());
// Check if we should replicate the copied destination blob
if (replicateDestination || BlobReplicationHandler.ShouldReplicateBlob(requestWrapper.Headers, destContainer, destBlob))
{
await BlobReplicationHandler.EnqueueBlobReplicationAsync(destNamespaceBlob, false);
}
return new HandlerResult
{
StatusCode = requestVersion >= StorageServiceVersions.Version_2012_02_12 ? HttpStatusCode.Accepted : HttpStatusCode.Created,
Headers = new ResponseHeaders(new[]
{
new KeyValuePair <string, string>("x-ms-copy-id", copyId),
new KeyValuePair <string, string>("x-ms-copy-status", destCloudBlob.CopyState.Status == CopyStatus.Success ? "success" : "pending"),
})
};
}
return new HandlerResult
{
StatusCode = HttpStatusCode.BadRequest,
};
}));
}
