how to use tornado with password hashing, original link https://groups.google.com/forum/#!topic/python-tornado/35BiBKdSCNw

tornado-hasher.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()