async Task WriteTasksAsync(IEnumerable <WriteTask> writeTasks, DirSnap dirSnap)
{
if (_currentWriter == null)
{
string filePath;
if (dirSnap.IsEmpty)
{
filePath = dirSnap.GetFilePath(0);
dirSnap.RegisterFile(filePath);
}
else
{
filePath = dirSnap.LastFile().FilePath;
}
var fileInfo = new FileInfo(filePath);
_currentWriter = GetWriter(filePath);
_approxBytesWritten = fileInfo.Exists ? fileInfo.Length : 0;
}
var flushNeeded = false;
foreach (var task in writeTasks)
{
foreach (var data in task.Data)
{
var line = Convert.ToBase64String(data);
_currentWriter.Write(line);
_currentWriter.WriteLine(LineTerminator);
_approxBytesWritten += line.Length + 1;
flushNeeded = true;
if (_approxBytesWritten > _settings.ApproximateMaximumFileLength)
{
await _currentWriter.FlushAsync();
flushNeeded = false;
_currentWriter.Dispose();
var nextFileNumber = dirSnap.LastFile().FileNumber + 1;
var nextFilePath = dirSnap.GetFilePath(nextFileNumber);
dirSnap.RegisterFile(nextFilePath);
_approxBytesWritten = 0;
_currentWriter = GetWriter(nextFilePath);
var allFiles = dirSnap.GetFiles().ToList();
var filesToDelete = allFiles
.Take(allFiles.Count - _settings.NumberOfFilesToKeep)
.ToList();
foreach (var file in filesToDelete)
{
try
{
File.Delete(file.FilePath);
dirSnap.RemoveFile(file);
_logger.Verbose($"Deleted file {file.FilePath}");
}
catch (Exception exception)
{
_logger.Information($"Could not delete file {file.FilePath}: {exception.Message}");
break;
}
}
}
}
}
if (flushNeeded)
{
await _currentWriter.FlushAsync();
}
}
