From e1053da8b9b81a1edf096a9ed76898b0a3f2d1a5 Mon Sep 17 00:00:00 2001
From: Alvaro Uria <alvaro.uria@canonical.com>
Date: Fri, 26 Apr 2019 18:00:38 +0200
Subject: [PATCH] Monitor -relation-changed

When keystone updates its relation data for the identity-service
relations, reactive charms need to be aware that an update occurred.
This change will add a new state (identity-service.available.updated).

Change-Id: Ic307f37f0ba861fb6b5f7d724565dea93c85906c
Closes-Bug: #1825951
---
 requires.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/requires.py b/requires.py
index 5626d1b..93c7a53 100644
--- a/requires.py
+++ b/requires.py
@@ -11,6 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from charmhelpers.core import hookenv
 from charms.reactive import RelationBase
 from charms.reactive import hook
 from charms.reactive import scopes
@@ -61,6 +62,8 @@ class KeystoneRequires(RelationBase):
     @hook('{requires:keystone-credentials}-relation-changed')
     def changed(self):
         self.update_state()
+        self.set_state('{relation_name}.available.updated')
+        hookenv.atexit(self._clear_updated)
 
     @hook('{requires:keystone-credentials}-relation-{broken,departed}')
     def departed(self):
@@ -133,3 +136,6 @@ class KeystoneRequires(RelationBase):
 
         self.set_local(**relation_info)
         self.set_remote(**relation_info)
+
+    def _clear_updated(self):
+        self.remove_state('{relation_name}.available.updated')