def get_instance_identity_info_from_instance_metadata()

in src/mount_efs/__init__.py [0:0]

• 35 lines of code
• 5 McCabe index (conditional complexity)

def get_instance_identity_info_from_instance_metadata(config, property):
    logging.debug("Retrieve property %s from instance metadata", property)
    ec2_metadata_unsuccessful_resp = (
        "Unsuccessful retrieval of EC2 metadata at %s." % INSTANCE_METADATA_SERVICE_URL
    )
    ec2_metadata_url_error_msg = (
        "Unable to reach %s to retrieve EC2 instance metadata."
        % INSTANCE_METADATA_SERVICE_URL
    )

    global INSTANCE_IDENTITY
    if INSTANCE_IDENTITY:
        logging.debug(
            "Instance metadata already retrieved in previous call, use the cached values."
        )
        instance_identity = INSTANCE_IDENTITY
    else:
        instance_identity = url_request_helper(
            config,
            INSTANCE_METADATA_SERVICE_URL,
            ec2_metadata_unsuccessful_resp,
            ec2_metadata_url_error_msg,
        )
        INSTANCE_IDENTITY = instance_identity

    if instance_identity:
        try:
            return instance_identity[property]
        except KeyError as e:
            logging.warning(
                "%s not present in %s: %s" % (property, instance_identity, e)
            )
        except TypeError as e:
            logging.warning(
                "response %s is not a json object: %s" % (instance_identity, e)
            )

    return None