How to use the motor.motor_tornado.MotorClient function in motor

#!/usr/bin/python
# -*- coding: utf-8 -*-
import os
from . import Opml, Feed
from . import HackerNews, Reddit
from tornado import gen, queues
from tornado.ioloop import IOLoop
from concurrent.futures import ThreadPoolExecutor
from motor.motor_tornado import MotorClient

thread_pool = ThreadPoolExecutor(2)

feeds = queues.Queue()
entries = queues.Queue()
client = MotorClient(os.environ['MONGO_ENTRIES'])
db = client['entries-by-votes']

ENTRIES_AGE = float(os.environ.get('ENTRIES_AGE', 14))


@gen.coroutine
def do_insert_entry(entry):
    yield db.entries.update_one(
        {'link': entry['link']}, {'$set': entry}, upsert=True
    )


@gen.coroutine
def get_feeds():
    return (yield thread_pool.submit(Opml().get_feeds))

def __init__(self):
        handlers = urlpatterns
        conn = MotorClient(Settings.MONGO_HOST,Settings.MONGO_PORT)
        self.db = conn[Settings.DB_NAME]
        settings = dict(
            template_path = Settings.TEMPLATE_PATH,
            static_path = Settings.STATIC_PATH,
            debug = Settings.DEBUG,
        )
        tornado.web.Application.__init__(self,handlers=handlers,**settings)

def __init__(self, name: str, connection_uri: str, logSizeBytes: int=100*1024*1024) -> None:
        self.name = name
        self.conn = motor.motor_tornado.MotorClient(connection_uri)
        self.db = self.conn['hopps_{}'.format(name)]
        self.commit_collection = None
        self.security_collection = self.db['security']

        self.__ready = self.db.create_collection('committed',
                                                 capped=True,
                                                 size=logSizeBytes)

""" 初始化mongodb连接
    """

    if username and password:
        username = quote_plus(username)
        password = quote_plus(password)
        host = quote_plus(host)
        uri = 'mongodb://{username}:{password}@{host}/{dbname}'.format(
            username=username,
            password=password,
            host=host,
            dbname=dbname,
        )
    else:
        uri = "mongodb://{host}/{dbname}".format(host=host, dbname=dbname)
    mongo_client = motor.motor_tornado.MotorClient(uri)
    global MONGO_CONN
    MONGO_CONN = mongo_client
    logger.info('create mongodb connection pool.')

try:
    f = open("./local/settings.json")
    settings = json.load(f)
except Exception:
    # В случае проблем с чтением настроек из файла, оставим пустые настройки.
    settings = {}

# Базовые настройки запуска системы
define("port", default=settings["system_port"], help="run on the given port", type=int)

# Настройки подключения к базе данных MongoDB
client_motor = db_motor = None
settings_db = settings.get("db", {})
for connection_name, setting_db in settings_db.items():
    client_motor = MotorClient(setting_db["host"], setting_db["port"])
    # todo Разрулить с доступами к базам
    db_motor = client_motor[setting_db["name"]]

# Настройки подключения к Redis
client_redis = tredis.RedisClient(host=settings["redis"]["host"], port=settings["redis"]["port"])

# Настройки SSL
try:
    ssl_ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
    ssl_ctx.load_cert_chain(settings["ssl"]["certificates"][0], settings["ssl"]["certificates"][1])
except KeyError:
    ssl_ctx = None

# Настройки приложения - доступны внутри хендлеров через self.settings
system_settings = {
    "client_motor": db_motor,