// Called by AzureBlobSyncProvider.UpdateItem to help with writing item updates
internal SyncedBlobAttributes UpdateFile(
string oldName,
FileData fileData,
string relativePath,
Stream dataStream,
DateTime expectedLastModified
)
{
CloudBlob blob = Container.GetBlobReference(oldName);
try
{
blob.FetchAttributes();
}
catch (StorageClientException e)
{
// Someone may have deleted the blob in the mean time
if (e.ErrorCode == StorageErrorCode.BlobNotFound)
{
throw new ApplicationException("Concurrency Violation", e);
}
throw;
}
BlobProperties blobProperties = blob.Properties;
//
// For directories create an empty data stream
//
if (dataStream == null)
{
dataStream = new MemoryStream();
}
SetupMetadata(blob.Metadata, fileData, relativePath);
blobProperties.ContentType = LookupMimeType(Path.GetExtension(fileData.Name));
// Specify an optimistic concurrency check to prevent races with other endpoints syncing at the same time.
BlobRequestOptions opts = new BlobRequestOptions();
opts.AccessCondition = AccessCondition.IfNotModifiedSince(expectedLastModified);
try
{
blob.UploadFromStream(dataStream, opts);
}
catch (StorageClientException e)
{
// Someone must have modified the file in the mean time
if (e.ErrorCode == StorageErrorCode.BlobNotFound || e.ErrorCode == StorageErrorCode.ConditionFailed)
{
throw new ApplicationException("Storage Error", e);
}
throw;
}
blobProperties = blob.Properties;
SyncedBlobAttributes attributes = new SyncedBlobAttributes(blob.Uri.ToString(), blobProperties.LastModifiedUtc);
return(attributes);
}
// Called by AzureBlobSyncProvider.InsertItem.
internal SyncedBlobAttributes InsertFile(FileData fileData, string relativePath, Stream dataStream)
{
if (fileData.Name.Length > MaxFileNameLength)
{
throw new ApplicationException("Name Too Long");
}
CloudBlob blob = Container.GetBlobReference(fileData.RelativePath.ToLower());
BlobProperties blobProperties = blob.Properties;
DateTime uninitTime = blobProperties.LastModifiedUtc;
SetupMetadata(blob.Metadata, fileData, relativePath);
blobProperties.ContentType = LookupMimeType(Path.GetExtension(fileData.Name));
if (fileData.IsDirectory)
{
// Directories have no stream
dataStream = new MemoryStream();
}
// Specify an optimistic concurrency check to prevent races with other endpoints syncing at the same time.
BlobRequestOptions opts = new BlobRequestOptions();
opts.AccessCondition = AccessCondition.IfNotModifiedSince(uninitTime);
try
{
blob.UploadFromStream(dataStream, opts);
}
catch (StorageException e)
{
if (e.ErrorCode == StorageErrorCode.BlobAlreadyExists || e.ErrorCode == StorageErrorCode.ConditionFailed)
{
throw new ApplicationException("Concurrency Violation", e);
}
throw;
}
blobProperties = blob.Properties;
SyncedBlobAttributes attributes = new SyncedBlobAttributes(blob.Uri.ToString(), blobProperties.LastModifiedUtc);
return(attributes);
}
// Called by the framework when an item (file) needs to be added to the store.
public override void InsertItem(
object itemData,
IEnumerable <SyncId> changeUnitsToCreate,
RecoverableErrorReportingContext recoverableErrorReportingContext,
out ItemFieldDictionary keyAndUpdatedVersion,
out bool commitKnowledgeAfterThisItem
)
{
IFileDataRetriever dataRetriever = (IFileDataRetriever)itemData;
string relativePath = dataRetriever.RelativeDirectoryPath;
keyAndUpdatedVersion = null;
commitKnowledgeAfterThisItem = false;
ApplyingBlobEventArgs args = new ApplyingBlobEventArgs(ChangeType.Create, dataRetriever.FileData.Name);
EventHandler <ApplyingBlobEventArgs> applyingDelegate = ApplyingChange;
applyingDelegate(this, args);
try
{
Stream dataStream = null;
if (!dataRetriever.FileData.IsDirectory)
{
dataStream = dataRetriever.FileStream;
}
SyncedBlobAttributes attrs = DataStore.InsertFile(dataRetriever.FileData, dataRetriever.RelativeDirectoryPath, dataStream);
keyAndUpdatedVersion = new ItemFieldDictionary();
keyAndUpdatedVersion.Add(new ItemField(ItemFields.CUSTOM_FIELD_NAME, typeof(string), attrs._name));
keyAndUpdatedVersion.Add(new ItemField(ItemFields.CUSTOM_FIELD_TIMESTAMP, typeof(ulong), (ulong)attrs._lastModifiedTime.ToBinary()));
}
catch (ApplicationException e)
{
recoverableErrorReportingContext.RecordRecoverableErrorForChange(new RecoverableErrorData(e));
}
}
