Use more caching in multidomain module

src/pretix/multidomain/middlewares.py

@@ -4,6 +4,7 @@ from urllib.parse import urlparse
 from django.conf import settings
 from django.contrib.sessions.middleware import \
     SessionMiddleware as BaseSessionMiddleware
+from django.core.cache import cache
 from django.core.exceptions import DisallowedHost
 from django.core.urlresolvers import set_urlconf
 from django.http.request import split_domain_port
@@ -12,6 +13,7 @@ from django.utils.cache import patch_vary_headers
 from django.utils.deprecation import MiddlewareMixin
 from django.utils.http import cookie_date
 
+from pretix.base.models import Organizer
 from pretix.multidomain.models import KnownDomain
 
 LOCAL_HOST_NAMES = ('testserver', 'localhost')
@@ -36,17 +38,26 @@ class MultiDomainMiddleware(MiddlewareMixin):
         if domain:
             request.host = domain
             request.port = int(port) if port else None
-            try:
-                kd = KnownDomain.objects.get(domainname=domain)  # noqa
-                request.domain = kd
-            except:
+
+            orga = cache.get('pretix_multidomain_organizer_{}'.format(domain))
+            if orga is None:
+                try:
+                    kd = KnownDomain.objects.select_related('organizer').get(domainname=domain)  # noqa
+                    orga = kd.organizer
+                except KnownDomain.DoesNotExist:
+                    orga = False
+                cache.set('pretix_multidomain_organizer_{}'.format(domain), orga.pk if orga else False, 3600)
+
+            if orga:
+                print(orga)
+                request.organizer = orga if isinstance(orga, Organizer) else Organizer.objects.get(pk=orga)
+                request.urlconf = "pretix.multidomain.subdomain_urlconf"
+            else:
                 if settings.DEBUG or domain in LOCAL_HOST_NAMES or domain == default_domain:
                     request.urlconf = "pretix.multidomain.maindomain_urlconf"
                 else:
                     raise DisallowedHost("Unknown host: %r" % host)
-            else:
-                request.organizer = kd.organizer
-                request.urlconf = "pretix.multidomain.subdomain_urlconf"
+
         else:
             raise DisallowedHost("Invalid HTTP_HOST header: %r." % host)
 

src/pretix/multidomain/models.py

@@ -1,3 +1,4 @@
+from django.core.cache import cache
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
@@ -19,8 +20,10 @@ class KnownDomain(models.Model):
         super().save(*args, **kwargs)
         if self.organizer:
             self.organizer.get_cache().clear()
+        cache.delete('pretix_multidomain_organizer_{}'.format(self.domainname))
 
     def delete(self, *args, **kwargs):
         if self.organizer:
             self.organizer.get_cache().clear()
+        cache.delete('pretix_multidomain_organizer_{}'.format(self.domainname))
         super().delete(*args, **kwargs)