Add object-store relation

Implements the swift-proxy interface. This is needed in order for
the glance (or any other) charm to be able to consume RadosGW the
same way they would consume Swift.

Change-Id: Ia59e1286ca25a71bcdf74be38c9dffb07c5be64f

hooks/hooks.py

@@ -181,6 +181,15 @@ def install():
         leader_set(namespace_tenants=config('namespace-tenants'))
 
 
+@hooks.hook('object-store-relation-joined')
+def object_store_joined(relation_id=None):
+    relation_data = {
+        'swift-url':
+        "{}:{}".format(canonical_url(CONFIGS, INTERNAL), listen_port())
+    }
+    relation_set(relation_id=relation_id, relation_settings=relation_data)
+
+
 @hooks.hook('upgrade-charm.real')
 def upgrade_charm():
     if is_leader() and not leader_get('namespace_tenants') == 'True':
@@ -225,6 +234,10 @@ def config_changed():
         for r_id in relation_ids('certificates'):
             certs_joined(r_id)
 
+        # Refire object-store relations for VIP/port changes
+        for r_id in relation_ids('object-store'):
+            object_store_joined(r_id)
+
         process_multisite_relations()
 
         CONFIGS.write_all()

hooks/object-store-relation-joined

@@ -0,0 +1 @@
+hooks.py

metadata.yaml

@@ -43,6 +43,8 @@ provides:
     interface: http
   master:
     interface: radosgw-multisite
+  object-store:
+    interface: swift-proxy
 peers:
   cluster:
     interface: swift-ha

unit_tests/test_hooks.py

@@ -250,6 +250,18 @@ class CephRadosGWTests(CharmTestCase):
         ceph_hooks.gateway_relation()
         self.relation_set.assert_called_with(hostname='10.0.0.1', port=80)
 
+    @patch.object(ceph_hooks, "canonical_url")
+    def test_object_store_relation(self, _canonical_url):
+        relation_data = {
+            "swift-url": "http://radosgw:80"
+        }
+        self.listen_port.return_value = 80
+        _canonical_url.return_value = "http://radosgw"
+        ceph_hooks.object_store_joined()
+        self.relation_set.assert_called_with(
+            relation_id=None,
+            relation_settings=relation_data)
+
     @patch.object(ceph_hooks, 'leader_get')
     @patch('charmhelpers.contrib.openstack.ip.service_name',
            lambda *args: 'ceph-radosgw')