"""Infrastructure handling module."""

import os

from autonomic.settings import MEMBERS_YAML
from autonomic.system import exit_with_msg
from autonomic.yaml import yaml


def get_members():
    """Get list of Autonomic members."""
    if not os.path.exists(MEMBERS_YAML):
        msg = "{} is missing, run: autonomic init".format(MEMBERS_YAML)
        exit_with_msg(msg)

    with open(MEMBERS_YAML, "r") as handle:
        try:
            return yaml.load(handle.read())
        except Exception as exception:
            exit_with_msg(str(exception))