Refs #44 -- Added background queue support for file export

src/pretix/base/services/export.py

@@ -0,0 +1,23 @@
+from django.conf import settings
+from django.core.files.base import ContentFile
+
+from pretix.base.models import CachedFile, Event, cachedfile_name
+from pretix.base.signals import register_data_exporters
+
+
+def export(event, fileid, provider, form_data):
+    event = Event.objects.current.get(identity=event)
+    file = CachedFile.objects.get(id=fileid)
+    responses = register_data_exporters.send(event)
+    for receiver, response in responses:
+        ex = response(event)
+        if ex.identifier == provider:
+            file.filename, file.type, data = ex.render(form_data)
+            file.file.save(cachedfile_name(file, file.filename), ContentFile(data))
+
+
+if settings.HAS_CELERY:
+    from pretix.celery import app
+
+    export_task = app.task(export)
+    export = lambda *args, **kwargs: export_task.apply_async(args=args, kwargs=kwargs)