From b388aaacb33fc607ee164853e3af262ede9f9745 Mon Sep 17 00:00:00 2001
From: Justin Pomeroy <jpomero@linux.vnet.ibm.com>
Date: Thu, 25 Sep 2014 15:13:36 -0500
Subject: [PATCH] Persist usage start and end dates in the session

This patch adds the usage start and end dates to the user's session
so they are saved while navigating between pages.

Closes-Bug: #1373651
Change-Id: I3046b5533eb96f85fb2f90e63b3ff84360ad14c4
---
 openstack_dashboard/usage/base.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/openstack_dashboard/usage/base.py b/openstack_dashboard/usage/base.py
index 90de447563..e516524938 100644
--- a/openstack_dashboard/usage/base.py
+++ b/openstack_dashboard/usage/base.py
@@ -86,14 +86,21 @@ class BaseUsage(object):
 
     def get_form(self):
         if not hasattr(self, 'form'):
-            if any(key in ['start', 'end'] for key in self.request.GET):
+            req = self.request
+            start = req.GET.get('start', req.session.get('usage_start'))
+            end = req.GET.get('end', req.session.get('usage_end'))
+            if start and end:
                 # bound form
-                self.form = forms.DateForm(self.request.GET)
+                self.form = forms.DateForm({'start': start, 'end': end})
             else:
                 # non-bound form
                 init = self.init_form()
-                self.form = forms.DateForm(initial={'start': init[0],
-                                                    'end': init[1]})
+                start = init[0].isoformat()
+                end = init[1].isoformat()
+                self.form = forms.DateForm(initial={'start': start,
+                                                    'end': end})
+            req.session['usage_start'] = start
+            req.session['usage_end'] = end
         return self.form
 
     def _get_neutron_usage(self, limits, resource_name):