Include proper log when Kuryr cannot reach Octavia API

This is not the proper way of informing user that Octavia returns 503,
we should have a nice message or we'll start getting bug reports on us

Closes-bug: 1918708

Change-Id: I871c3998edb5b1d594067b60e908c453ad122dde

kuryr_kubernetes/controller/drivers/lbaasv2.py

@@ -29,6 +29,7 @@ from kuryr_kubernetes.controller.drivers import base
 from kuryr_kubernetes import exceptions as k_exc
 from kuryr_kubernetes import utils
 
+
 CONF = cfg.CONF
 LOG = logging.getLogger(__name__)
 
@@ -118,7 +119,10 @@ class LBaaSv2Driver(base.LBaaSDriver):
         # won't assume this dict is sorted.
         max_ver = 0, 0
         for version in versions:
-            v_tuple = versionutils.convert_version_to_tuple(version['version'])
+            if version.get('version') is None:
+                raise k_exc.UnreachableOctavia('Unable to reach Octavia API')
+            v_tuple = versionutils.convert_version_to_tuple(
+                version['version'])
             if v_tuple > max_ver:
                 max_ver = v_tuple
 

kuryr_kubernetes/exceptions.py

@@ -116,3 +116,14 @@ class CNIBindingFailure(Exception):
     """Exception indicates a binding/unbinding VIF failure in CNI"""
     def __init__(self, message):
         super(CNIBindingFailure, self).__init__(message)
+
+
+class UnreachableOctavia(Exception):
+    """Exception indicates Octavia API failure and can not be reached
+
+    This exception is raised when Kuryr can not reach Octavia. The Octavia
+    API call returns 'None' on the version field and we need to properly log
+    a message informing the user
+    """
+    def __init__(self, message):
+        super(UnreachableOctavia, self).__init__(message)

kuryr_kubernetes/tests/unit/controller/drivers/test_lbaasv2.py

@@ -57,6 +57,20 @@ OCTAVIA_VERSIONS = {
     },
 }
 
+BAD_OCTAVIA_VERSIONS = {
+    'regionOne': {
+        'public': {
+            'load-balancer': [
+                {
+                    'status': 'CURRENT',
+                    'version': None,
+                    'raw_status': u'CURRENT',
+                },
+            ],
+        },
+    },
+}
+
 
 class TestLBaaSv2Driver(test_base.TestCase):
     @mock.patch('kuryr_kubernetes.controller.drivers.lbaasv2.LBaaSv2Driver.'
@@ -110,6 +124,12 @@ class TestLBaaSv2Driver(test_base.TestCase):
         self.assertEqual((2, 2),
                          d_lbaasv2.LBaaSv2Driver.get_octavia_version(None))
 
+    def test_get_octavia_version_is_none(self):
+        lbaas = self.useFixture(k_fix.MockLBaaSClient()).client
+        lbaas.get_all_version_data.return_value = BAD_OCTAVIA_VERSIONS
+        self.assertRaises(k_exc.UnreachableOctavia,
+                          d_lbaasv2.LBaaSv2Driver.get_octavia_version, None)
+
     def test_ensure_loadbalancer(self):
         os_net = self.useFixture(k_fix.MockNetworkClient()).client
         cls = d_lbaasv2.LBaaSv2Driver