def __init__(self, filepath):
        self.filepath = filepath
        self._running = False
        self._closing = False
        self._service_thread = None
        self._queue = Queue()
        self._formatter = Formatter()
:param filepath: new record will append to file if filepath exists
dataset/ETHPy150Open jjyr/zerotest/zerotest/record/http_recorder.py/HTTPRecorder.__init__