protected override GetBackupFolderFilesResult GetBackupFilesInFolder(string folder, DateTime startDateOfRetentionRange)
{
var backupFiles = new GetBackupFolderFilesResult();
string blobsNextMarker = null;
bool firstFileSet = false;
do
{
var blobs = _client.ListBlobs(folder, delimiter: null, listFolders: false, marker: blobsNextMarker);
foreach (var blob in blobs.List)
{
if (firstFileSet == false)
{
backupFiles.FirstFile = blob.Name;
firstFileSet = true;
}
if (RestorePointsBase.TryExtractDateFromFileName(blob.Name, out var lastModified) && lastModified > startDateOfRetentionRange)
{
backupFiles.LastFile = blob.Name;
return(backupFiles);
}
}
blobsNextMarker = blobs.NextMarker;
CancellationToken.ThrowIfCancellationRequested();
} while (blobsNextMarker != null);
return(backupFiles);
}
private bool GotFreshIncrementalBackup(GetBackupFolderFilesResult backupFiles, DateTime now)
{
if (backupFiles.LastFile == null)
{
return(false);
}
if (backupFiles.FirstFile.Equals(backupFiles.LastFile))
{
return(false);
}
if (RestorePointsBase.TryExtractDateFromFileName(backupFiles.LastFile, out var lastModified) == false)
{
lastModified = File.GetLastWriteTimeUtc(backupFiles.LastFile).ToLocalTime();
}
return(now - lastModified < _retentionPolicy.MinimumBackupAgeToKeep);
}