From 103fe2acca57648710617072d94afcf2b2442985 Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Mon, 21 Mar 2016 17:57:23 +0100
Subject: [PATCH] Try to improve async task performance by using more
 long-running requests

---
 src/pretix/presale/views/async.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/pretix/presale/views/async.py b/src/pretix/presale/views/async.py
index 815646710..9417ba45e 100644
--- a/src/pretix/presale/views/async.py
+++ b/src/pretix/presale/views/async.py
@@ -1,5 +1,6 @@
 import logging
 
+import celery.exceptions
 from django.conf import settings
 from django.contrib import messages
 from django.http import JsonResponse
@@ -43,11 +44,18 @@ class AsyncAction:
         from celery.result import AsyncResult
         res = AsyncResult(request.GET.get('async_id'))
         if 'ajax' in self.request.GET:
+            if not res.ready():
+                try:
+                    res.get(timeout=0.5)
+                except celery.exceptions.TimeoutError:
+                    pass
+
+            ready = res.ready()
             data = {
                 'async_id': res.id,
-                'ready': res.ready()
+                'ready': ready
             }
-            if res.ready():
+            if ready:
                 if res.successful() and not isinstance(res.info, Exception):
                     smes = self.get_success_message(res.info)
                     if smes: