k8s - add support for Server Side apply (#260)

k8s - add support for Server Side apply

SUMMARY

Server side apply is now support for k8s module with this Pull request.
The feature is not yet released on kubernetes-client, once this is done, we can merge this pull request.
closes #87

ISSUE TYPE


Feature Pull Request

COMPONENT NAME

k8s
ADDITIONAL INFORMATION

Reviewed-by: Mike Graves <mgraves@redhat.com>
Reviewed-by: None <None>
Reviewed-by: None <None>

plugins/module_utils/apply.py

@@ -114,12 +114,14 @@ def apply_patch(actual, desired):
         return actual, dict_merge(desired, annotate(desired))
 
 
-def apply_object(resource, definition):
+def apply_object(resource, definition, server_side=False):
     try:
         actual = resource.get(
             name=definition["metadata"]["name"],
             namespace=definition["metadata"].get("namespace"),
         )
+        if server_side:
+            return actual, None
     except NotFoundError:
         return None, dict_merge(definition, annotate(definition))
     return apply_patch(actual.to_dict(), definition)
@@ -127,6 +129,17 @@ def apply_object(resource, definition):
 
 def k8s_apply(resource, definition, **kwargs):
     existing, desired = apply_object(resource, definition)
+    server_side = kwargs.get("server_side", False)
+    if server_side:
+        body = json.dumps(definition).encode()
+        # server_side_apply is forces content_type to 'application/apply-patch+yaml'
+        return resource.server_side_apply(
+            body=body,
+            name=definition["metadata"]["name"],
+            namespace=definition["metadata"].get("namespace"),
+            force_conflicts=kwargs.get("force_conflicts"),
+            field_manager=kwargs.get("field_manager"),
+        )
     if not existing:
         return resource.create(
             body=desired, namespace=definition["metadata"].get("namespace"), **kwargs