Non Blocking calls using Tornado and Python Eve

Question

I have a Eve Application with Tornado.

http_server = HTTPServer(WSGIContainer(app))
http_server.listen(5000)
IOLoop.instance().start()

I make a post call on of my API that takes a long time and sends a mail to the user when the process is done. How can I make the call non blocking so that the user do not have to wait.

Thanks DC

Answer 1

Eve is written in Flask so by design it's blocking code and there's no simple way to make it magically non-blocking. Running your eve project in tornado will not help either. You can however use gunicorn or hendrix which can fork your wsgi app, act like a proxy, and make it seem like your project is running in a non-blocking manner. But I recommend using an async/threaded task runner (something like celery ) to send the mail. This method will require you to rewrite your mailing functions using the task runner. I hope this helps, if not please provide some more examples of what your code does and maybe we can help.