Testing the client .GET() method: https://github.com/kubernetes-sigs/controller-runtime/blob/master/pkg/client/example_test.go in case where secret exists in a cluster

$ kubectl get secrets

NAME                    TYPE                                  DATA   AGE

default-token-hqpn5     kubernetes.io/service-account-token   3      14d

mariadb-sample-secret   Opaque                                1      40m

• Testing returned error and the object

  root_secret := &corev1.Secret{}

  err := r.Get(ctx, req.Namespace, root_secret)

  log.Info("Get()", "error: ", err, "root_secret", *root_secret)

  2022-06-17T01:59:20.696-0700 INFO controllers.MariaDB1 Get() {"MariaDB: ": "default/mariadb-sample", "error: ": "Secret \"mariadb-sample\" not found", "root_secret": {"metadata":{"creationTimestamp":null}}}

  We can see that the object is not nil and there is creationTime Null (what we can use to check), also err is not nil

• Update the code with typed object (have to stop controller and run make run again to have visible changes)

  err := r.Get(ctx, client.ObjectKey{

  Namespace: req.Namespace,

  Name: req.Name + "-secret",

  }, root_secret)

  log.Info("Get()", "error: ", err, "root_secret", *root_secret)

  2022-06-17T01:59:56.279-0700 INFO controllers.MariaDB1 Get() {"MariaDB: ": "default/mariadb-sample", "error: ": null, "root_secret": {"kind":"Secret","apiVersion":"v1","metadata":{"name":"mariadb-sample-secret","namespace":"default","uid":"8fda9ce2-d7e2-425d-81e3-33e6a779175a","resourceVersion":"82748","creationTimestamp":"2022-06-17T08:25:44Z","managedFields":[{"manager":"main","operation":"Update","apiVersion":"v1","time":"2022-06-17T08:25:44Z","fieldsType":"FieldsV1","fieldsV1":{"f:data":{".":{},"f:mariadb-root-password":{}},"f:type":{}}}]},"data":{"mariadb-root-password":"bXlzZWNyZXQ="},"type":"Opaque"}}

  Note here that err is nil and we got the object

• After making changes use make install build run