Add API alias for '/statuses'

Fixes a neutron-lbaas LBaaS v2 API compatibility issue when requesting a
load balancer status tree via '/statuses'. This patch adds an alias for
'/statuses' to use the same code as '/status'.

Change-Id: I7aebf87c5f48e2e72b1f7f26b95663a861382f36
Story: 2001812
Task: 12547

octavia/api/v2/controllers/load_balancer.py

@@ -483,15 +483,19 @@ class LoadBalancersController(base.BaseController):
     def _lookup(self, id, *remainder):
         """Overridden pecan _lookup method for custom routing.
 
-        Currently it checks if this was a statuses request and routes
-        the request to the StatusesController.
+        Currently it checks if this was a status request and routes
+        the request to the StatusController.
+
+        'statuses' is aliased here for backward compatibility with
+        neutron-lbaas LBaaS v2 API.
         """
         if id and len(remainder) and (remainder[0] == 'status' or
+                                      remainder[0] == 'statuses' or
                                       remainder[0] == 'stats' or
                                       remainder[0] == 'failover'):
             controller = remainder[0]
             remainder = remainder[1:]
-            if controller == 'status':
+            if controller == 'status' or controller == 'statuses':
                 return StatusController(lb_id=id), remainder
             elif controller == 'stats':
                 return StatisticsController(lb_id=id), remainder

octavia/tests/functional/api/v2/test_load_balancer.py

@@ -2436,10 +2436,25 @@ class TestLoadBalancerGraph(base.BaseAPITest):
         res = self.get(self.LB_PATH.format(lb_id=lb_id + "/status"))
         return res.json.get('statuses').get('loadbalancer')
 
+    # Test the "statuses" alias for "status".
+    # This is required for backward compatibility with neutron-lbaas
     def test_statuses(self):
         lb = self.create_load_balancer(
             uuidutils.generate_uuid()).get('loadbalancer')
 
+        statuses = self.get(self.LB_PATH.format(lb_id=lb['id'] + "/statuses"))
+        response = statuses.json.get('statuses').get('loadbalancer')
+        self.assertEqual(lb['name'], response['name'])
+        self.assertEqual(lb['id'], response['id'])
+        self.assertEqual(lb['operating_status'],
+                         response['operating_status'])
+        self.assertEqual(lb['provisioning_status'],
+                         response['provisioning_status'])
+
+    def test_status(self):
+        lb = self.create_load_balancer(
+            uuidutils.generate_uuid()).get('loadbalancer')
+
         response = self._getStatus(lb['id'])
         self.assertEqual(lb['name'], response['name'])
         self.assertEqual(lb['id'], response['id'])

releasenotes/notes/statuses_alias-27559e3d74b9eaf0.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes a neutron-lbaas LBaaS v2 API compatibility issue when requesting a
+    load balancer status tree via '/statuses'.