Cached and fixed statistics

src/pretix/plugins/statistics/signals.py

@@ -4,10 +4,11 @@ from django.template import Context
 from django.template.loader import get_template
 from django.utils.translation import ugettext_lazy as _
 
+from pretix.base.signals import order_paid, order_placed
 from pretix.control.signals import html_head, nav_event
 
 
-@receiver(nav_event)
+@receiver(nav_event, dispatch_uid="statistics_nav")
 def control_nav_import(sender, request=None, **kwargs):
     url = resolve(request.path_info)
     if not request.eventperm.can_view_orders:
@@ -25,7 +26,7 @@ def control_nav_import(sender, request=None, **kwargs):
     ]
 
 
-@receiver(html_head)
+@receiver(html_head, dispatch_uid="statistics_html_head")
 def html_head_presale(sender, request=None, **kwargs):
     url = resolve(request.path_info)
     if url.namespace == 'plugins:statistics':
@@ -34,3 +35,14 @@ def html_head_presale(sender, request=None, **kwargs):
         return template.render(ctx)
     else:
         return ""
+
+
+def clear_cache(sender, *args, **kwargs):
+    cache = sender.get_cache()
+    cache.delete('statistics_obd_data')
+    cache.delete('statistics_obp_data')
+    cache.delete('statistics_rev_data')
+
+
+order_placed.connect(clear_cache)
+order_paid.connect(clear_cache)

src/pretix/plugins/statistics/views.py

@@ -18,7 +18,11 @@ class IndexView(EventPermissionRequiredMixin, TemplateView):
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
 
+        cache = self.request.event.get_cache()
+
         # Orders by day
+        ctx['obd_data'] = cache.get('statistics_obd_data')
+        if not ctx['obd_data']:
             ordered_by_day = {}
             for o in Order.objects.current.filter(event=self.request.event).values('datetime'):
                 day = o['datetime'].date()
@@ -45,8 +49,11 @@ class IndexView(EventPermissionRequiredMixin, TemplateView):
                 })
 
             ctx['obd_data'] = json.dumps(data)
+            cache.set('statistics_obd_data', ctx['obd_data'])
 
         # Orders by product
+        ctx['obp_data'] = cache.get('statistics_obp_data')
+        if not ctx['obp_data']:
             num_ordered = {
                 p['item']: p['cnt']
                 for p in (OrderPosition.objects.current
@@ -72,7 +79,10 @@ class IndexView(EventPermissionRequiredMixin, TemplateView):
                     'paid': num_paid.get(item, 0)
                 } for item, cnt in num_ordered.items()
             ]
+            cache.set('statistics_obp_data', ctx['obp_data'])
 
+        ctx['rev_data'] = cache.get('statistics_rev_data')
+        if not ctx['rev_data']:
             rev_by_day = {}
             for o in Order.objects.current.filter(event=self.request.event,
                                                   status=Order.STATUS_PAID,
@@ -93,5 +103,6 @@ class IndexView(EventPermissionRequiredMixin, TemplateView):
                     'revenue': round(total, 2),
                 })
             ctx['rev_data'] = json.dumps(data)
+            cache.set('statistics_rev_data', ctx['rev_data'])
 
         return ctx