Async functions in Django views

Question

Is it possible to do something like this:

def new_query(request,company_uuid,address_uuid,contact_uuid):
    mcompany = get_object_or_404(Company, uuid=company_uuid)
    if request.method == 'POST': # If the form has been submitted...
        form = forms.CompanyQueryForm(request.POST)
        if form.is_valid():
            mquery = form.save(commit = False)
            mcompany = get_object_or_404(Company, uuid = company_uuid)
            mquery.company = mcompany
            mquery.version_number = 1
            mquery.parameters = {
                                    'company':company_uuid,
                                    'address':address_uuid,
                                    'contact':contact_uuid
                                    }
            mquery.save()
            preserialise(mquery.pk, company_uuid)
            recent_update = RecentUpdate(company_query=mquery, update_type="1")
            recent_update.save()
            url = reverse('view_directory',kwargs={'company_uuid':company_uuid,
                                                                'address_uuid':address_uuid,
                                                                'contact_uuid':contact_uuid})
            return HttpResponseRedirect(url)
    else:
        form = forms.CompanyQueryForm()
    return share.output_page(request,'joinerysoft/new_query.html',{'title':unicode(u'New Company Query'),
                                                                   'form': form,
                                                                   'company':mcompany,
                                                                   'address_uuid':address_uuid,
                                                                   'contact_uuid':contact_uuid})

where preserialise(mquery.pk, company_uuid) runs in the background without waiting to return? as pre-serialisation takes a long time to complete (over 5 minutes) and I'd like it to be a fire and forget from the perspective of the user.

Chris Pratt · Accepted Answer · 2012-07-24 15:24:21Z

6

You can always fire off a thread:

import threading

class PreserializeThread(threading.Thread):
    def __init__(self, mquery_pk, company_uuid, *args, **kwargs):
        self.mquery_pk = mquery_pk
        self.company_uuid = company_uuid
        super(PreserializeThread, self).__init__(*args, **kwargs)

    def run(self):
        preserialize(self.mquery_pk, self.company_uuid)

Then, replace preserialize in your code sample with:

PreserializeThread(mquery.pk, company_uuid).start()

See also: http://docs.python.org/library/threading.html

answered Jul 24, 2012 at 15:24

Chris Pratt

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2 Comments

leonsas Over a year ago

Would you recommend this or a more robust task queuing app like Celery? I guess each one has their own pros and cons but I'm not sure if stick to the simple python threads or go with celery.

Chris Pratt Over a year ago

I think this one simple task is overkill for Celery. If you were doing lots of this stuff and more complicated tasks that require monitoring, then, yes, Celery is where you should turn.

Jian Huang · Accepted Answer · 2020-07-23 01:03:26Z

1

Simple answer, no.

Your function will take until serialization is finished before continuing execution.

Have a look at django-celery for a task queuing solution.

As of 2020, celery now supports Django out of the box.

edited Jul 23, 2020 at 1:03

Jian Huang

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answered Jul 24, 2012 at 14:02

Hedde van der Heide

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3 Comments

Jharwood Over a year ago

If it makes it easier, there is no data to return from the function, and so it's more like an event..

Hedde van der Heide Over a year ago

It doesn't work that way, your function must complete before continuing

NFern Over a year ago

Does Async support change anything? docs.djangoproject.com/en/3.0/topics/async

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