def is_valid_hostname()

in src/hpc/autoscale/util.py [0:0]

• 19 lines of code
• 6 McCabe index (conditional complexity)

def is_valid_hostname(config: Dict, node: "Node") -> bool:
    # delayed import, as logging will import this module
    from hpc.autoscale import hpclogging as logging

    if not node.hostname:
        return False

    valid_hostnames: Optional[List[str]] = config.get("valid_hostnames")

    if not valid_hostnames:
        if is_standalone_dns(node):
            valid_hostnames = ["^ip-[0-9A-Za-z]{8}$"]
        else:
            return True

    for valid_hostname in valid_hostnames:
        if re.match(valid_hostname, node.hostname):
            return True

    logging.warning(
        "Rejecting invalid hostname '%s': Did not match any of the following patterns: %s",
        node.hostname,
        valid_hostnames,
    )
    return False