old_contents: import pymongo
  
  from ramjet.settings import MONGO_HOST, MONGO_PORT
  
  
  def get_conn():
      return pymongo.MongoClient(MONGO_HOST, MONGO_PORT)
  
new_contents: import pymongo
  
  from ramjet.settings import (
      MONGO_HOST, MONGO_PORT, MONGO_DB,
      MONGO_USER, MONGO_PASSWD
  )
  
  
  # only support twitter
  def get_conn():
      return pymongo.MongoClient(f'mongodb://{MONGO_USER}:{MONGO_PASSWD}@{MONGO_HOST}:{MONGO_PORT}/{MONGO_DB}')
  
subject: support mongo auth