Tornado Asynchronous Handler

Question

I am attempting to implement get_current_user in the RequestHandler for Tornado, but I need the call to block while waiting on the asynchronous call to my database. Decorat

Answer 1

How about having get_current_user return a Future that you signal when the asynchronous response from your database is returned?

class BaseHandler(tornado.web.RequestHandler):
    def get_current_user(self):
        future = Future()
        def query_cb(user):
            future.set_result(user or None)
        database.get(username='test', password='t3st', callback=query_cb)
        return future


class MainHandler(BaseHandler):
    @gen.coroutine
    def get(self):
        user = yield self.get_current_user()
        self.write('user: ' + user)
        # ... actual request processing