How to use the oauthenticator.OAuthLoginHandler function in oauthenticator

from tornado.auth import OAuth2Mixin
from tornado import gen, web
from traitlets.config import LoggingConfigurable
from oauthenticator import OAuthLoginHandler, OAuthenticator
from .CarinaOAuthClient import CarinaOAuthClient


class CarinaLoginHandler(OAuthLoginHandler, OAuth2Mixin):
    """
    Carina OAuth dance magic
    """

    _OAUTH_AUTHORIZE_URL = CarinaOAuthClient.CARINA_AUTHORIZE_URL
    _OAUTH_ACCESS_TOKEN_URL = CarinaOAuthClient.CARINA_TOKEN_URL

    scope = ['identity', 'read', 'write', 'execute']


class CarinaAuthenticator(OAuthenticator, LoggingConfigurable):
    """
    Authenticate users with their Carina account
    """

    # Configure the base OAuthenticator