struct-defaulting.txt

// How to default a struct field?

// Example code: https://github.com/gibizer/simple-operator-example/commit/08fb63dda8aae4c20272b8e87d680228948e8ff6

// terminal #1
[fedora@gibi-f35 simple-operator-example]$ make run
test -s /home/fedora/op-build/simple-operator-example/bin/controller-gen || GOBIN=/home/fedora/op-build/simple-operator-example/bin go install sigs.k8s.io/controller-tools/cmd/controller-gen@v0.9.2
/home/fedora/op-build/simple-operator-example/bin/controller-gen rbac:roleName=manager-role crd webhook paths="./..." output:crd:artifacts:config=config/crd/bases
/home/fedora/op-build/simple-operator-example/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
go fmt ./...
go vet ./...
go run ./main.go
I1102 16:50:47.048115  547877 request.go:601] Waited for 1.039133514s due to client-side throttling, not priority and fairness, request: GET:https://api.crc.testing:6443/apis/monitoring.coreos.com/v1?timeout=32s
1.6674078485037808e+09	INFO	controller-runtime.metrics	Metrics server is starting to listen	{"addr": ":8080"}
1.66740784850418e+09	INFO	setup	starting manager
1.6674078485048904e+09	INFO	Starting server	{"kind": "health probe", "addr": "[::]:8081"}
1.6674078485049362e+09	INFO	Starting EventSource	{"controller": "simple", "controllerGroup": "test.test.org", "controllerKind": "Simple", "source": "kind source: *v1beta1.Simple"}
1.6674078485045125e+09	INFO	Starting server	{"path": "/metrics", "kind": "metrics", "addr": "[::]:8080"}
1.667407848504993e+09	INFO	Starting Controller	{"controller": "simple", "controllerGroup": "test.test.org", "controllerKind": "Simple"}
1.6674078486059666e+09	INFO	Starting workers	{"controller": "simple", "controllerGroup": "test.test.org", "controllerKind": "Simple", "worker count": 1}
1.6674078749255793e+09	INFO	Reconciling	{"controller": "simple", "controllerGroup": "test.test.org", "controllerKind": "Simple", "simple": {"name":"simple-sample","namespace":"openstack"}, "namespace": "openstack", "name": "simple-sample", "reconcileID": "26c9fffe-35ae-4a45-b0fe-c90579e7f85d", "Spec.Pair": {}}

// terminal2
[fedora@gibi-f35 samples]$ cat test_v1beta1_simple.yaml 
apiVersion: test.test.org/v1beta1
kind: Simple
metadata:
  name: simple-sample
# spec only has a single field and it is defaulted 
[fedora@gibi-f35 samples]$ 
[fedora@gibi-f35 samples]$ oc kustomize . | oc apply -f -
simple.test.test.org/simple-sample created
[fedora@gibi-f35 samples]$


// --------------------
// I only get the default values of Pair, if it is not left out from the input but has '{}' value

// terminal1
1.6674082712927854e+09	INFO	Reconciling	{"controller": "simple", "controllerGroup": "test.test.org", "controllerKind": "Simple", "simple": {"name":"simple-sample","namespace":"openstack"}, "namespace": "openstack", "name": "simple-sample", "reconcileID": "952a7fba-6fad-422e-bf56-fef231befa44", "Spec.Pair": {"one":"Example1","two":"Example2"}}

// terminal2
[fedora@gibi-f35 samples]$ oc delete simple.test.test.org/simple-sample
simple.test.test.org "simple-sample" deleted
[fedora@gibi-f35 samples]$ 
[fedora@gibi-f35 samples]$ 
[fedora@gibi-f35 samples]$ vim test_v1beta1_simple.yaml 
[fedora@gibi-f35 samples]$ cat test_v1beta1_simple.yaml 
apiVersion: test.test.org/v1beta1
kind: Simple
metadata:
  name: simple-sample
spec:
  pair: {}

[fedora@gibi-f35 samples]$ oc kustomize . | oc apply -f -
simple.test.test.org/simple-sample created