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

src/pretix/base/__init__.py

@@ -8,7 +8,7 @@ class PretixBaseConfig(AppConfig):
     def ready(self):
         from . import exporter  # NOQA
         from . import payment  # NOQA
-        from .services import export, mail  # NOQA
+        from .services import export, mail, tickets  # NOQA
 
         try:
             from .celery import app as celery_app  # NOQA

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)

src/pretix/base/ticketoutput.py

@@ -28,9 +28,10 @@ class BaseTicketOutput:
         """
         return self.settings.get('_enabled', as_type=bool)
 
-    def generate(self, request: HttpRequest, order: Order) -> HttpResponse:
+    def generate(self, order: Order) -> tuple:
         """
-        This method should generate the download file and return it to the user.
+        This method should generate the download file and return a tuple consisting of a
+        filename, a file type and file content.
         """
         raise NotImplementedError()