--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gpp/core/management/commands/max_users.py	Sun Sep 12 18:30:23 2010 +0000
@@ -0,0 +1,44 @@
+"""
+max_users is a custom manage.py command.
+It is intended to be called from a cron job to calculate the maximum
+number of users online statistic.
+"""
+import datetime
+
+from django.core.management.base import NoArgsCommand
+
+from core.models import UserLastVisit, AnonLastVisit, Statistic
+
+
+class Command(NoArgsCommand):
+    help = "Run periodically to compute the max users online statistic."
+
+    def handle_noargs(self, **options):
+
+        now = datetime.datetime.now()
+        cut_off = now - datetime.timedelta(minutes=15)
+
+        users = UserLastVisit.objects.filter(last_visit__gte=cut_off).count()
+        guests = AnonLastVisit.objects.filter(last_visit__gte=cut_off).count()
+
+        updated = False
+        try:
+            stat = Statistic.objects.get(pk=1)
+        except Statistic.DoesNotExist:
+            stat = Statistic(max_users=users,
+                    max_users_date=now,
+                    max_anon_users=guests,
+                    max_anon_users_date=now)
+            updated=True
+        else:
+            if users > stat.max_users:
+                stat.max_users = users
+                stat.max_users_date = now
+                updated=True
+            if guests > stat.max_anon_users:
+                stat.max_anon_users = guests
+                stat.max_anon_users_date = now
+                updated=True
+
+        if updated:
+            stat.save()