Flask-socketio + Flask-Login/Flask-OpenID trouble

[TwoBitAlchemist]

I am trying to use the above in combination, and switching to a configuration that starts the gevent-socketio worker seems to have broken my otherwise working login.

Here is my login setup, taken almost directly from your Mega-Tutorial

### Flask-Login & Flask-OpenID ###                                              
@lm.user_loader                                                                 
def load_user(id):                                                              
    return User.query.get(int(id))                                            


@app.before_request                                                             
def before_request():                                                           
    g.user = current_user                                                       


@app.route('/login', methods=['GET', 'POST'])                                   
@oid.loginhandler                                                               
def login():                                                                    
    if g.user is not None and g.user.is_authenticated():                           
        return redirect(oid.get_next_url())                               
    form = LoginForm()                                                             
    if form.validate_on_submit():                                                  
        session['remember_me'] = form.remember_me.data                             
        return oid.try_login(form.openid.data, ask_for=('email',))              
    return render_template('login.html', form=form, providers=OPENID_PROVIDERS)

When I start the server using the app.run() method, this all works normally. Switching to either socketio.run(app) or gunicorn --worker-class socketio.sgunicorn.GeventSocketIOWorker module:app causes the form POST to get turned into a GET request, which never validates because it is missing 'openid' and 'csrf_token'.

Update

Removing flask-openid works around this, although this not a great long-term solution in my case. (At least, I may have to find something to replace it.) I believe the problem is in @oid.loginhandler decoration but I have not looked into it.

[miguelgrinberg]

I'm going to guess that this problem is caused by an incompatibility between the gevent web server and the python-openid package.

Have you tried adding monkey patching? That might help, just add the following at the top of your main Python script:

from gevent import monkey
monkey.patch_all()

Make sure this is done above any other imports, put them in lines 1 & 2 above everything else.

[TwoBitAlchemist]

It has been almost 2 weeks but I finally got a chance to make a serious effort to reincorporate python-openid (free time projects, you know). Just for reference, monkey patching did not work for me. Nor did changing the form to use GET. I doubt I will get this solved since I have made so little headway myself and python-openid may basically be abandoned. It seems the best solution for now is not to use that in conjunction with this or at all.

[miguelgrinberg]

It's unfortunate, but yes, there's probably no easy solution other than debugging python-openid when used with gevent.

[gordol]

This example works just fine with socketio: https://github.com/mitsuhiko/flask-openid/blob/master/example/example.py

You can just replace the app.run with this:

from flask.ext.socketio import SocketIO
socketio = SocketIO(app)

if __name__ == '__main__':
    init_db()
    app.auto_reload = True
    socketio.run(app, host='0.0.0.0', port=8082)

And you'll need to update the sqlalchemy commit() stuff, but the OpenID aspect works just fine.