fetch_service_config.py 文件源码

def fetch_service_config_rollout_strategy(metadata):
    """Fetch service config rollout strategy from metadata URL."""
    url = metadata + _METADATA_PATH + "/attributes/" + \
        _METADATA_ROLLOUT_STRATEGY
    headers = {"Metadata-Flavor": "Google"}
    client = urllib3.PoolManager(ca_certs=certifi.where())
    try:
        response = client.request("GET", url, headers=headers)
    except:
        logging.info("Failed to fetch service config rollout strategy " + \
            "from the metadata server: " + url);
        return None
    status_code = response.status

    if status_code != 200:
        # Fetching rollout strategy is optional. No need to leave log
        return None

    rollout_strategy = response.data
    logging.info("Service config rollout strategy: " + rollout_strategy)
    return rollout_strategy