global variable in django (singleton)

Question

I have django app. App - client for site with authorization App contains some methods which run periodically, but all methods created auth objects, for example: method runs 10 times, with 10 re-autorization. I tried session to store that object but get error:

def get_api_instance(request):
    if 'api' not in request.session: 
        api = auth()
        request.session['api'] = api
    return request.session['api']


<****api.api.Api object at 0x7fe30d155550> is not JSON serializable

Can you recommend something?

UPD: in simple python script i can create global variable:

api_var = None

def get_api():
   if not api_var:
      api_var = auth()
   return api_var

def periodic():
   api = get_api_var()
   ....

jithin, no. I create api(which is wrapper) object and run methods in it. — icdu91
– icdu91, Commented Apr 6, 2016 at 11:25
The session has nothing to do with global objects and is not an appropriate place to do this. Can you explain a bit more about the object? Is it per-user? — Daniel Roseman
– Daniel Roseman, Commented Apr 6, 2016 at 11:28
@daniel-roseman, yes, one user has only one api_auth_instance — icdu91
– icdu91, Commented Apr 6, 2016 at 11:39

ahmed · Accepted Answer · 2020-04-10 18:48:49Z

1

You can add a function to the User object to get the Auth class instance, you can also use propery caching to only create it once:

from django.contrib.auth.models import User

def user_get_auth(self):
    # Initialze the Auth class here

    return Auth()


User.add_to_class("get_auth", property(user_get_auth))

in the views.py or templates you can get the Auth class by:

request.user.get_auth.some_method()

edited Apr 10, 2020 at 18:48

answered Apr 6, 2016 at 12:33

ahmed

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