utils.py 文件源码

def _retrieve_credentials(self, full_url, extra_headers=None):
        headers = {'Accept': 'application/json'}
        if extra_headers is not None:
            headers.update(extra_headers)
        attempts = 0
        while True:
            try:
                return self._get_response(full_url, headers, self.TIMEOUT_SECONDS)
            except MetadataRetrievalError as e:
                logger.debug("Received error when attempting to retrieve "
                             "container metadata: %s", e, exc_info=True)
                self._sleep(self.SLEEP_TIME)
                attempts += 1
                if attempts >= self.RETRY_ATTEMPTS:
                    raise