def _download_worker(self, file_id, local_file, mime_type, sleep_delay=1):
"""Download file worker thread."""
# For moment create new GDrive as http module used by underlying api is
# not multi-thread aware and also add delay in for google 403 error if more
# than approx 8 requests a second are made.
#
# TO DO: Get rid of delay and GDrive creation for each download.
try:
drive = GDrive(self._remote_drive.credentials)
drive.file_download(file_id, local_file, mime_type)
time.sleep(sleep_delay)
except GDriveError as e:
logging.error(e)
self._download_errors += 1
