Peers_from_control_nodes requires listener port

Adds validation and a unit test to ensure:

- peers_from_control_nodes=True should fail if
listener_port is not set
- peers_from_control_nodes=False should be NOOP if
listener_port is not set

Signed-off-by: Seth Foster <fosterbseth@gmail.com>

awx/api/serializers.py

@@ -5708,6 +5708,11 @@ class InstanceSerializer(BaseSerializer):
         if len(set(peers_instances)) != len(peers_instances):
             raise serializers.ValidationError(_("Cannot peer to the same instance more than once."))
 
+        # cannot enable peers_from_control_nodes if listener_port is not set
+        if attrs.get('peers_from_control_nodes'):
+            if not attrs.get('listener_port') and self.instance and self.instance.canonical_address_port is None:
+                raise serializers.ValidationError(_("Cannot enable peers_from_control_nodes if listener_port is not set."))
+
         return super().validate(attrs)
 
     def validate_node_type(self, value):

awx/main/tests/functional/api/test_instance_peers.py

@@ -136,17 +136,24 @@ class TestPeers:
 
     def test_peers_from_control_nodes_without_listener_port(self, admin_user, patch):
         """
-        patching with peers_from_control_nodes should not create a receptor address
+        patching with peers_from_control_nodes=True should fail if listener_port is not set
-        if port is not defined
+        patching with peers_from_control_nodes=False should be NOOP if listener_port is not set
         """
         hop = Instance.objects.create(hostname='abc', node_type="hop")
-        patch(
+        resp = patch(
             url=reverse('api:instance_detail', kwargs={'pk': hop.pk}),
             data={"peers_from_control_nodes": True},
             user=admin_user,
+            expect=400,
+        )
+        assert 'Cannot enable peers_from_control_nodes if listener_port is not set' in str(resp.data)
+        patch(
+            url=reverse('api:instance_detail', kwargs={'pk': hop.pk}),
+            data={"peers_from_control_nodes": False},
+            user=admin_user,
             expect=200,
         )
-        assert not ReceptorAddress.objects.filter(instance=hop).exists()
+        assert not ReceptorAddress.objects.filter(instance=hop, peers_from_control_nodes=False).exists()
 
     def test_bidirectional_peering(self, admin_user, patch):
         """