Calling a function in Django view after return HttpResponse()

Question

this is a different aproach for the question I already asked

so it will share the intro.

I have in my web project a time consuming function. While the function is doing its computations, a web page should be rendered informing the user that the results will be sent by email once the computation is done.

views.py:

def web_function(request):
    ...
    return HttpResponse(results_will_be_sent_by_mail.html)
    time_consuming_function()

Since the page that has to be rendered is quite simple, and it requires no return information from time_consuming_function() is there a way to skip multitasking and just somehow first render and show the page and than call time_consuming_function()?

Possible solution:

When the input button is pressed on the page that precedes the calling of "web_function", attach some javascript code which will render the temporary page?

Update

Ended up using celery. Wasn't successful in experimenting with Ajax.

Can't you use request_finished signal? However, I'm not sure it is raised before/after sending the response. docs.djangoproject.com/en/dev/ref/signals/#request-finished — Rohan
– Rohan, Commented Sep 13, 2012 at 6:18

Hedde van der Heide · Accepted Answer · 2012-09-13 06:26:33Z

7

A return statement in a function represents the end of that function.* Your snippet's time_consuming function is outside the function's scope and thus will never be reached.

A solution for handling the task could be: celery which is well suited for wrapping functions as asynchronous tasks. If you must do things synchronous, why don't you use ajax for this so you can atleast show the user what's going on with a BeforeSend?

*This is true for Python and most, if not all, object oriented programming languages

answered Sep 13, 2012 at 6:26

Hedde van der Heide

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4 Comments

Burhan Khalid Over a year ago

+1, in fact, if you have a smart IDE it will tell you that "code is not reachable".

Steven Over a year ago

+1 for using celery. However, in general don't perform long running tasks in your Django web processes, even using AJAX (as that is asynchronous for the client but not the Django server), as this will reduce the scalability of your application by starving out available request-processing threads.

TheMeaningfulEngineer Over a year ago

@Hedde Can you point to a good tutorial for integrating BeforeSend?

Hedde van der Heide Over a year ago

@Alan I have answered another question with an example before you can find it here: stackoverflow.com/questions/11615901/django-api-requests/…

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