api_generarcvs_task.py

class ActivityRecordViewSet(GenericViewSet):
    #omit code

    @detail_route(
        methods=['GET'],
        permission_classes=[DirectorPermission])
    def csv(self, request, pk, *args, **kwargs):
        """
        Download a report of a domain complete or period
        ---
        omit_serializer: true

        responseMessages:
            - code: 200
              message: OK
            - code: 403
              message: FORBIDDEN
            - code: 404
              message: NOT FOUND
            - code: 500
              message: INTERNAL SERVER ERROR
        consumes:
            - application/json
        produces:
            - application/json
        """
        date_since = request.GET.get('datesince', None)
        date_to = request.GET.get('dateto', None)
        verbs = request.GET.get(
            'verb', settings.CUSTOM_ACTIONS.values()
        )

        file_task=generate_file.delay(pk, verbs, date_since, date_to)
        return Response({"task_id": file_task.task_id }, status=status.HTTP_200_OK)


class ActivityDownloadViewSet(GenericViewSet):
    permission_classes=[DirectorPermission]

    def post(self, request, *args, **kwargs):
        task_id=request.data.get('task_id')
        result = task_.AsyncResult(task_id)
        if result.ready():
            #el return ya es un HttpResponse, pero no se si sirva para salir del ciclo
            return result.get()
        return Response({"status": False }, status=status.HTTP_400_BAD_REQUEST)