update celery to a version that works in python3.7

pandora/archive/views.py

@@ -10,7 +10,7 @@ from django.db.models import Count, Q
 
 from six import string_types
 from celery.utils import get_full_cls_name
-from celery.backends import default_backend
+from celery._state import current_app
 import ox
 from oxdjango.decorators import login_required_json
 from oxdjango.shortcuts import render_to_json_response, get_object_or_404_json, json_response
@@ -390,8 +390,11 @@ def getTaskStatus(request, data):
     else:
         task_id = data['task_id']
     response = json_response(status=200, text='ok')
-    status = default_backend.get_status(task_id)
-    res = default_backend.get_result(task_id)
+
+    backend = current_app.backend
+    status = backend.get_status(task_id)
+    res = backend.get_result(task_id)
+
     response['data'] = {
         'id': task_id,
         'status': status

pandora/settings.py

@@ -6,8 +6,6 @@ from __future__ import absolute_import
 
 import os
 from os.path import join, normpath, dirname
-import djcelery
-djcelery.setup_loader()
 
 BASE_DIR = PROJECT_ROOT = normpath(dirname(__file__))
 BIN_DIR = normpath(join(PROJECT_ROOT, '..', 'bin'))
@@ -122,7 +120,7 @@ INSTALLED_APPS = (
     'django.contrib.humanize',
 
     'django_extensions',
-    'djcelery',
+    'django_celery_results',
     'app',
     'log',
     'annotation',

pandora/taskqueue/models.py

@@ -4,7 +4,6 @@ from __future__ import division, print_function, absolute_import
 from datetime import datetime, timedelta
 from time import time
 
-from celery.backends import default_backend
 from celery.utils import get_full_cls_name
 from django.contrib.auth import get_user_model
 from django.conf import settings

requirements.txt

@@ -1,8 +1,8 @@
 Django==1.11.22
 simplejson
 chardet
-celery==3.1.26.post2
-django-celery==3.2.2
+celery>4
+django-celery-results
 django-extensions==2.0.7
 gunicorn==19.8.1
 html5lib