human
I wrote the below code

    from hadoop.cluster import get_all_hdfs
    from hadoop.fs.hadoopfs import Hdfs
    from liboozie.oozie_api import get_oozie
    res = []
    if OOZIE_URL.get():
        status = get_oozie_status(user)
        if ('NORMAL' not in status):
            res.append((status, _('The    Oozie    server    is    not    available')))
        api = get_oozie(user, api_version='v2')
        configuration = api.get_configuration()
        if ('org.apache.oozie.service.MetricsInstrumentationService' in [c.strip() for c in configuration.get('oozie.services.ext', '').split(',')]):
            metrics = api.get_metrics()
            sharelib_url = ((('gauges' in metrics) and ('libs.sharelib.system.libpath' in metrics['gauges']) and [metrics['gauges']['libs.sharelib.system.libpath']['value']]) or [])
        else:
            intrumentation = api.get_instrumentation()
            sharelib_url = [param['value'] for group in intrumentation['variables'] for param in group['data'] if (param['name'] == 'sharelib.system.libpath')]
        if sharelib_url:
            sharelib_url = Hdfs.urlsplit(sharelib_url[0])[2]
        if (not sharelib_url):
            res.append((status, _('Oozie    Share    Lib    path    is    not    available')))
        class ConfigMock:
            def __init__(self, value):
                self.value = value
            def get(self):
                return self.value
            def get_fully_qualifying_key(self):
                return self.value
        for cluster in get_all_hdfs().values():
            res.extend(validate_path(ConfigMock(sharelib_url), is_dir=True, fs=cluster, message=_('Oozie    Share    Lib    not    installed    in    default    location.')))
    return res

What's a good function header?
assistant
#Here's a good function header.

def config_validator(user):