Fix missing dependency in amphora create flow

Task CertComputeCreate requires SERVER_GROUP_ID but this dependency is
missing when nova anti-affinity is enabled and load balancer topology is
SINGLE. This patch fixes this issue.

Task: 40408
Story: 2007943
Closes-Bug: #1888397

Change-Id: I757d84e4624f488382ec4ff9af3f489cd9a85ed3
(cherry picked from commit ae6f344359)
(cherry picked from commit 2da18070a6)

octavia/controller/worker/v1/controller_worker.py

@@ -324,11 +324,12 @@ class ControllerWorker(base_taskflow.BaseTaskFlowEngine):
                  constants.LB_CREATE_NORMAL_PRIORITY,
                  constants.FLAVOR: flavor}
 
-        if not CONF.nova.enable_anti_affinity:
-            store[constants.SERVER_GROUP_ID] = None
-
         topology = lb.topology
 
+        if (not CONF.nova.enable_anti_affinity or
+                topology == constants.TOPOLOGY_SINGLE):
+            store[constants.SERVER_GROUP_ID] = None
+
         store[constants.UPDATE_DICT] = {
             constants.TOPOLOGY: topology
         }

octavia/tests/unit/controller/worker/v1/test_controller_worker.py

@@ -366,12 +366,41 @@ class TestControllerWorker(base.TestCase):
 
         _flow_mock.run.assert_called_once_with()
 
+    def test_create_load_balancer_single_no_anti_affinity(
+            self, mock_api_get_session,
+            mock_dyn_log_listener, mock_taskflow_load, mock_pool_repo_get,
+            mock_member_repo_get, mock_l7rule_repo_get, mock_l7policy_repo_get,
+            mock_listener_repo_get, mock_lb_repo_get,
+            mock_health_mon_repo_get, mock_amp_repo_get):
+        # Test the code path with Nova anti-affinity disabled
+        self.conf.config(group="nova", enable_anti_affinity=False)
+        self._test_create_load_balancer_single(
+            mock_api_get_session,
+            mock_dyn_log_listener, mock_taskflow_load, mock_pool_repo_get,
+            mock_member_repo_get, mock_l7rule_repo_get,
+            mock_l7policy_repo_get, mock_listener_repo_get,
+            mock_lb_repo_get, mock_health_mon_repo_get, mock_amp_repo_get)
+
+    def test_create_load_balancer_single_anti_affinity(
+            self, mock_api_get_session,
+            mock_dyn_log_listener, mock_taskflow_load, mock_pool_repo_get,
+            mock_member_repo_get, mock_l7rule_repo_get, mock_l7policy_repo_get,
+            mock_listener_repo_get, mock_lb_repo_get,
+            mock_health_mon_repo_get, mock_amp_repo_get):
+        # Test the code path with Nova anti-affinity enabled
+        self.conf.config(group="nova", enable_anti_affinity=True)
+        self._test_create_load_balancer_single(
+            mock_api_get_session,
+            mock_dyn_log_listener, mock_taskflow_load, mock_pool_repo_get,
+            mock_member_repo_get, mock_l7rule_repo_get,
+            mock_l7policy_repo_get, mock_listener_repo_get,
+            mock_lb_repo_get, mock_health_mon_repo_get, mock_amp_repo_get)
+
     @mock.patch('octavia.controller.worker.v1.flows.load_balancer_flows.'
                 'LoadBalancerFlows.get_create_load_balancer_flow',
                 return_value=_flow_mock)
-    def test_create_load_balancer_single(
+    def _test_create_load_balancer_single(
             self,
-            mock_get_create_load_balancer_flow,
             mock_api_get_session,
             mock_dyn_log_listener,
             mock_taskflow_load,
@@ -382,7 +411,8 @@ class TestControllerWorker(base.TestCase):
             mock_listener_repo_get,
             mock_lb_repo_get,
             mock_health_mon_repo_get,
-            mock_amp_repo_get):
+            mock_amp_repo_get,
+            mock_get_create_load_balancer_flow):
 
         # Test the code path with an SINGLE topology
         self.conf.config(group="controller_worker",

releasenotes/notes/fix-missing-amphora-create-dependency-a954ded0d260d462.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixed an issue where amphora load balancers fail to create when Nova
+    anti-affinity is enabled and topology is SINGLE.