Async Password //// https://groups.google.com/d/msg/python-tornado/35BiBKdSCNw/zx561l-sABIJ

p.py

  from concurrent.futures import ThreadPoolExecutor
  from tornado import gen
  from tornado.process import cpu_count
  import bcrypt

  # global threadpool
  pool = ThreadPoolExecutor(cpu_count())

  @gen.coroutine
  def create_user(name, password):
    hashed_pw = yield pool.submit(bcrypt.hashpw, password, bcrypt.gensalt()
    yield save_user(name, hashed_pw)

  @gen.coroutine
  def login(name, password):
    user = yield load_user(name)
    match = yield pool.submit(bcrypt.checkpw, password, user.hashed_pw)
    if not match:
      raise IncorrectPasswordError()