Refs #44 -- Added background queue support for ticket output

src/pretix/base/services/export.py

@@ -14,6 +14,7 @@ def export(event, fileid, provider, form_data):
         if ex.identifier == provider:
             file.filename, file.type, data = ex.render(form_data)
             file.file.save(cachedfile_name(file, file.filename), ContentFile(data))
+            file.save()
 
 
 if settings.HAS_CELERY:

src/pretix/base/services/tickets.py

@@ -0,0 +1,34 @@
+from datetime import timedelta
+from django.conf import settings
+from django.core.files.base import ContentFile
+from django.utils.timezone import now
+
+from pretix.base.models import CachedFile, cachedfile_name, Order, CachedTicket
+from pretix.base.signals import register_ticket_outputs
+
+
+def generate(order, provider):
+    order = Order.objects.current.select_related('event').get(identity=order)
+    ct = CachedTicket.objects.get_or_create(order=order, provider=provider)[0]
+    if not ct.cachedfile:
+        cf = CachedFile()
+        cf.date = now()
+        cf.expires = order.event.date_from + timedelta(days=30)
+        cf.save()
+        ct.cachedfile = cf
+        ct.save()
+
+    responses = register_ticket_outputs.send(order.event)
+    for receiver, response in responses:
+        prov = response(order.event)
+        if prov.identifier == provider:
+            ct.cachedfile.filename, ct.cachedfile.type, data = prov.generate(order)
+            ct.cachedfile.file.save(cachedfile_name(ct.cachedfile, ct.cachedfile.filename), ContentFile(data))
+            ct.cachedfile.save()
+
+
+if settings.HAS_CELERY:
+    from pretix.celery import app
+
+    generate_task = app.task(generate)
+    generate = lambda *args, **kwargs: generate_task.apply_async(args=args, kwargs=kwargs)