in spectator/writer/file_writer.go [16:22]
func NewFileWriter(filename string, logger logger.Logger) (*FileWriter, error) {
file, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return nil, err
}
return &FileWriter{file, logger}, nil
}