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POTornado testing async requests
 

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    <p>I need an advice regards testing tornado app. For now I just playing with demo chat application, but it looks like real-life problem. </p> <p>In the handler I have:</p> <pre><code>class MessageUpdatesHandler(BaseHandler): @tornado.web.authenticated @tornado.web.asynchronous def post(self): cursor = self.get_argument("cursor", None) global_message_buffer.wait_for_messages(self.on_new_messages, cursor=cursor) def on_new_messages(self, messages): # Closed client connection if self.request.connection.stream.closed(): return self.finish(dict(messages=messages)) class MessageBuffer(object): def __init__(self): .... def wait_for_messages(self, callback, cursor=None): if cursor: new_count = 0 for msg in reversed(self.cache): if msg["id"] == cursor: break new_count += 1 if new_count: callback(self.cache[-new_count:]) return self.waiters.add(callback) def cancel_wait(self, callback): ..... def new_messages(self, messages): logging.info("Sending new message to %r listeners", len(self.waiters)) for callback in self.waiters: try: callback(messages) except: logging.error("Error in waiter callback", exc_info=True) self.waiters = set() self.cache.extend(messages) if len(self.cache) &gt; self.cache_size: self.cache = self.cache[-self.cache_size:] </code></pre> <p>As I metioned full source code is in <a href="https://github.com/facebook/tornado/blob/master/demos/chat/chatdemo.py" rel="nofollow">torndado demos</a></p> <p>In my test I have:</p> <pre><code>@wsgi_safe class MessageUpdatesHandlerTest(LoginedUserHanldersTest): Handler = MessageUpdatesHandler def test_add_message(self): from chatdemo import global_message_buffer kwargs = dict( method="POST", body='', ) future = self.http_client.fetch(self.get_url('/'), callback=self.stop, **kwargs) message = { "id": '123', "from": "first_name", "body": "hello", "html": "html" } global_message_buffer.new_messages([message]) response = self.wait() self.assertEqual(response.code, 200) self.mox.VerifyAll() </code></pre> <p>What happens:</p> <ol> <li>It creates a future object</li> <li>It sends a hello message, in this moment no <code>waiter</code> is registered in <code>MessageBuffer</code> so callback is not called</li> <li>In <code>wait</code> starts IoLoop and makes, a post fetch and <code>waiter</code> becomes registered in <code>MessageBuffer</code></li> <li><p>Callback is never called and my response remains empty, so everything fails with </p> <p>AssertionError: Async operation timed out after 5 seconds</p></li> </ol> <p>What I want it to do:</p> <ol> <li>On post register itself as a waiter</li> <li>Receive some messages</li> <li>Return to me a 200 response</li> </ol> <p>Thank you for your help</p>
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