fetch_service_config.py 文件源码

def fetch_service_config_id(metadata):
    """Fetch service config ID from metadata URL."""
    url = metadata + _METADATA_PATH + "/attributes/" + _METADATA_SERVICE_CONFIG_ID
    headers = {"Metadata-Flavor": "Google"}
    client = urllib3.PoolManager(ca_certs=certifi.where())
    try:
        response = client.request("GET", url, headers=headers)
        if response.status != 200:
            # Fetching service config id is optional. No need to leave log
            raise None
    except:
        url = metadata + _METADATA_PATH + "/attributes/endpoints-service-version"
        try:
            response = client.request("GET", url, headers=headers)
        except:
            logging.info("Failed to fetch service config ID from the metadata server: " + url)
            return None

        if response.status != 200:
            message_template = "Fetching service config ID failed (url {}, status code {})"
            logging.info(message_template.format(url, response.status))
            return None

    version = response.data
    logging.info("Service config ID:" + version)
    return version