Implement Booking Cleanup Task

Jira: PHAROS-344

Two new settings in config.env allow setting
	1) how "stale" an expired booking can get before being culled and
	2) how many expired bookings are kept around before culling
If either condition is met, expired bookings will be deleted until
both are false.

Change-Id: I6b091e93c6fe5d47b75ebf5325b717fa898c773c
Signed-off-by: Sawyer Bergeron <sbergeron@iol.unh.edu>

1 files changed, 18 insertions, 2 deletions

diff --git a/dashboard/src/dashboard/tasks.py b/dashboard/src/dashboard/tasks.py
index aab3345..fa2ee9d 100644
--- a/dashboard/src/dashboard/tasks.py
+++ b/dashboard/src/dashboard/tasks.py
@@ -7,16 +7,32 @@
 # http://www.apache.org/licenses/LICENSE-2.0
 ##############################################################################
 
-
 from datetime import timedelta
 
 from celery import shared_task
 from django.utils import timezone
+from django.conf import settings
+from booking.models import Booking
 
 from jenkins.models import JenkinsStatistic
 
-
 @shared_task
 def database_cleanup():
     now = timezone.now()
     JenkinsStatistic.objects.filter(timestamp__lt=now - timedelta(weeks=4)).delete()
+
+def booking_cleanup():
+    expire_time = timedelta(days=int(settings.BOOKING_EXP_TIME))
+    expire_number = int(settings.BOOKING_MAX_NUM)
+    expired_set = Booking.objects.filter(end__lte=timezone.now())
+    expired_count = len(expired_set)
+
+    for booking in expired_set:
+        if timezone.now() - booking.end > expire_time:
+            booking.delete()
+            expired_count = expired_count - 1
+
+    if expired_count > expire_number:
+        oldest = expired_set.order_by("end")[:expired_count-expire_number]
+        for booking in oldest:
+            booking.delete()