Flask + asyncio

12,040

Solution 1

Flask-aiohttp is not drop-in replacement for flask: often it works but sometimes produces errors like your observed.

I suggest trying just aiohttp. It has SockJS support by third-party library SockJS.

Solution 2

This question is outdated but is first on Google results list. So I will put it here:

If you are looking for asyncio-compatible drop-in Flask replacement then you may want to look at Quart. It is intended to be an (almost) drop-in replacement, and it even supports Flask extensions.

Share:
12,040
Admin
Author by

Admin

Updated on June 04, 2022

Comments

  • Admin
    Admin over 1 year

    My goal is to upgrade the application from python2 to python3. The application uses the following packages: flask, flask-admin, gevent (coroutine), socketio. Flask was decided to leave, and the rest of the packages to be replaced. There have been several attempts to replace the packages:

    1. Tornado + SockJS: a lot of extra code because of the lack of SockJS channels
    2. Flask-aiohttp: during authorization, request.form['username'] throws an error:

    Traceback (most recent call last):

     File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/app.py",line 1381, in handle_user_exception reraise(exc_type, exc_value, tb)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/_compat.py",line 33, in reraise raise value
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/app.py",line 1475, in full_dispatch_request
    rv = self.dispatch_request()
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/app.py", line 1461, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args)
     File "/home/user/workspace/aiolina/aiolina.py", line 33, in login username = request.form['username']
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/local.py", line 338, in __getattr__
    return getattr(self._get_current_object(), name)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/utils.py", line 71, in __get__
    value = self.func(obj)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/wrappers.py", line 488, in form
    self._load_form_data()
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/flask/wrappers.py", line 165, in _load_form_data
    RequestBase._load_form_data(self)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/wrappers.py", line 360, in _load_form_data
    mimetype, content_length, options)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/formparser.py", line 193, in parse
    content_length, options)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/formparser.py", line 103, in wrapper
    exhaust()
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/wsgi.py", line 977, in exhaust
    self.read(chunk)
    File "/home/user/.env/rbaio34/lib/python3.4/site-packages/werkzeug/wsgi.py", line 994, in read
    if to_read and len(read) != to_read:TypeError: object of type 'generator' has no len()
    

    So, what can be done to Flask-aiohttp work? Or what packages use instead?