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query namespace exists with GET Namespace

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More efficient ns switches with kubens by querying only the namespace (instead
of listing all namespaces).

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>
This commit is contained in:
Ahmet Alp Balkan
2020-05-31 14:36:28 -07:00
parent 0141ee19d2
commit cd1849d8df
2 changed files with 29 additions and 16 deletions
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22
cmd/kubens/list.go
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@@ -54,15 +54,7 @@ func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
return []string{"ns1", "ns2"}, nil
}
b, err := kc.Bytes()
if err != nil {
return nil, errors.Wrap(err, "failed to convert in-memory kubeconfig to yaml")
}
cfg, err := clientcmd.RESTConfigFromKubeConfig(b)
if err != nil {
return nil, errors.Wrap(err, "failed to initialize config")
}
clientset, err := kubernetes.NewForConfig(cfg)
clientset, err := newKubernetesClientSet(kc)
if err != nil {
return nil, errors.Wrap(err, "failed to initialize k8s REST client")
}
@@ -87,3 +79,15 @@ func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
}
return out, nil
}
func newKubernetesClientSet(kc *kubeconfig.Kubeconfig) (*kubernetes.Clientset, error) {
b, err := kc.Bytes()
if err != nil {
return nil, errors.Wrap(err, "failed to convert in-memory kubeconfig to yaml")
}
cfg, err := clientcmd.RESTConfigFromKubeConfig(b)
if err != nil {
return nil, errors.Wrap(err, "failed to initialize config")
}
return kubernetes.NewForConfig(cfg)
}