/// <summary>
/// Returns the status of a file as it exists (or doesn't) in Azure cloud storage.
/// </summary>
/// <param name="file"><c>BackupFile</c></param>
/// <param name="sourceLocation"><c>SourceLocation</c></param>
/// <param name="directory"><c>DirectoryMapItem</c></param>
/// <returns><c>ProviderFileStatus</c></returns>
public async Task <StorageProviderFileStatus> GetFileStatusAsync(BackupFile file, SourceLocation sourceLocation, DirectoryMapItem directory)
{
// calculate my uri
string sasBlobUri = null;
if (sourceLocation.Priority == FileBackupPriority.Meta)
{
// file has a specific destination container. this is reserved for meta folders.
// use that specific container and filename instead of a guid-based uri.
sasBlobUri = ProviderUtilities.GetFileUri(AzureStorage.Credentials.AccountName, sourceLocation.DestinationContainerName, file.Filename.ToLower());
}
else
{
sasBlobUri = ProviderUtilities.GetFileUri(AzureStorage.Credentials.AccountName, directory.GetRemoteContainerName(StorageProviderTypes.Azure), file.GetRemoteFileName(StorageProviderTypes.Azure));
}
// the default state for a freshly initialized file status object is unsynced.
// if the blob doesn't exist, the file is unsynced.
CloudBlockBlob blob = new CloudBlockBlob(new Uri(sasBlobUri), AzureStorage.Credentials);
var fileStatus = new StorageProviderFileStatus(StorageProviderTypes.Azure);
// does the file exist at the specified uri?
if (await blob.ExistsAsync(MetaDataRequestOptions, null).ConfigureAwait(false))
{
// -- query metadata
// -- determine state from metadata
await blob.FetchAttributesAsync(null, MetaDataRequestOptions, null).ConfigureAwait(false);
var allPropsAndMetadata = new Dictionary <string, string>(blob.Metadata);
allPropsAndMetadata.Add(ProviderMetadata.HydrationStateKeyName, ProviderUtilities.GetHydrationStatusFromAzureState(blob.Properties.RehydrationStatus));
fileStatus.ApplyMetadataToState(allPropsAndMetadata);
}
return(fileStatus);
}
