/
client.go
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/
client.go
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package nodeutil
import (
"os"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
coordclientset "k8s.io/client-go/kubernetes/typed/coordination/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
// ClientsetFromEnv returns a kuberentes client set from:
// 1. the passed in kubeconfig path
// 2. If the kubeconfig path is empty or non-existent, then the in-cluster config is used.
func ClientsetFromEnv(kubeConfigPath string) (*kubernetes.Clientset, error) {
var (
config *rest.Config
err error
)
if kubeConfigPath != "" {
config, err = clientsetFromEnvKubeConfigPath(kubeConfigPath)
} else {
config, err = rest.InClusterConfig()
}
if err != nil {
return nil, errors.Wrap(err, "error getting rest client config")
}
return kubernetes.NewForConfig(config)
}
func clientsetFromEnvKubeConfigPath(kubeConfigPath string) (*rest.Config, error) {
_, err := os.Stat(kubeConfigPath)
if os.IsNotExist(err) {
return rest.InClusterConfig()
}
if err != nil {
return nil, err
}
return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeConfigPath},
&clientcmd.ConfigOverrides{},
).ClientConfig()
}
// PodInformerFilter is a filter that you should use when creating a pod informer for use with the pod controller.
func PodInformerFilter(node string) kubeinformers.SharedInformerOption {
return kubeinformers.WithTweakListOptions(func(options *metav1.ListOptions) {
options.FieldSelector = fields.OneTermEqualSelector("spec.nodeName", node).String()
})
}
// NodeLeaseV1Client creates a V1 Lease client for use with node leases from the passed in client.
//
// Use this with node.WithNodeEnableLeaseV1Beta1 when creating a node controller.
func NodeLeaseV1Client(client kubernetes.Interface) coordclientset.LeaseInterface {
return client.CoordinationV1().Leases(corev1.NamespaceNodeLease)
}