Renew kubeconfig when it expires. (#229)

* fix expired kubeconfig when tf apply/plan

* update k8s resource docs

gridscale/resource_gridscale_k8s.go

@@ -259,6 +259,19 @@ func resourceGridscaleK8sRead(d *schema.ResourceData, meta interface{}) error {
 		return fmt.Errorf("%s error setting name: %v", errorPrefix, err)
 	}
 	if len(creds) > 0 {
+		// if expiration_time of kubeconfig is reached, renew it and get new kubeconfig
+		if creds[0].ExpirationTime.Before(time.Now()) {
+			err = client.RenewK8sCredentials(context.Background(), d.Id())
+			if err != nil {
+				return fmt.Errorf("%s error renewing k8s kubeconfig: %v", errorPrefix, err)
+			}
+			paas, err = client.GetPaaSService(context.Background(), d.Id())
+			if err != nil {
+				return fmt.Errorf("%s error: %v", errorPrefix, err)
+			}
+			props = paas.Properties
+			creds = props.Credentials
+		}
 		if err = d.Set("kubeconfig", creds[0].KubeConfig); err != nil {
 			return fmt.Errorf("%s error setting kubeconfig: %v", errorPrefix, err)
 		}

website/docs/r/k8s.html.md

@@ -75,6 +75,7 @@ This resource exports the following attributes:
 * `service_template_uuid` - PaaS service template that k8s service uses. The `service_template_uuid` may not relate to `release`, if `service_template_uuid`/`release` is updated outside of terraform (e.g. the k8s service is upgraded by gridscale staffs).
 * `service_template_category` - The template service's category used to create the service.
 * `labels` - See Argument Reference above.
+* `kubeconfig` - The kubeconfig file content of the k8s cluster.
 * `network_uuid` - *DEPRECATED*  Network UUID containing security zone, which is linked to the k8s cluster.
 * `k8s_private_network_uuid` - Private network UUID which k8s nodes are attached to. It can be used to attach other PaaS/VMs.
 * `node_pool` - See Argument Reference above.