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kubernetes.go
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kubernetes.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package cluster
import (
"context"
"net"
"strconv"
"strings"
"time"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
k8s "github.com/siderolabs/talos/pkg/kubernetes"
"github.com/siderolabs/talos/pkg/machinery/constants"
)
// KubernetesClient provides Kubernetes client built via Talos API Kubeconfig.
type KubernetesClient struct {
// Base Talos client provider.
ClientProvider
// ForceEndpoint overrides default Kubernetes API endpoint.
ForceEndpoint string
KubeHelper *k8s.Client
kubeconfig []byte
clientset *kubernetes.Clientset
}
// Kubeconfig returns raw kubeconfig.
//
// Kubeconfig is cached.
func (k *KubernetesClient) Kubeconfig(ctx context.Context) ([]byte, error) {
if k.kubeconfig != nil {
return k.kubeconfig, nil
}
client, err := k.Client()
if err != nil {
return nil, err
}
k.kubeconfig, err = client.Kubeconfig(ctx)
return k.kubeconfig, err
}
// K8sRestConfig returns *rest.Config (parsed kubeconfig).
func (k *KubernetesClient) K8sRestConfig(ctx context.Context) (*rest.Config, error) {
kubeconfig, err := k.Kubeconfig(ctx)
if err != nil {
return nil, err
}
config, err := clientcmd.BuildConfigFromKubeconfigGetter("", func() (*clientcmdapi.Config, error) {
return clientcmd.Load(kubeconfig)
})
if err != nil {
return nil, err
}
// patch timeout
config.Timeout = time.Minute
if k.ForceEndpoint != "" {
forceEndpoint, _ := strings.CutPrefix(k.ForceEndpoint, "https://")
host, port, err := net.SplitHostPort(forceEndpoint)
if err != nil {
host = forceEndpoint
port = strconv.Itoa(constants.DefaultControlPlanePort)
}
config.Host = net.JoinHostPort(host, port)
}
return config, nil
}
// K8sClient builds Kubernetes client via Talos Kubeconfig API.
//
// Kubernetes client instance is cached.
func (k *KubernetesClient) K8sClient(ctx context.Context) (*kubernetes.Clientset, error) {
if k.clientset != nil {
return k.clientset, nil
}
config, err := k.K8sRestConfig(ctx)
if err != nil {
return nil, err
}
if k.KubeHelper, err = k8s.NewForConfig(config); err != nil {
return nil, err
}
k.clientset = k.KubeHelper.Clientset
return k.clientset, nil
}
// K8sHelper returns wrapper around K8sClient.
func (k *KubernetesClient) K8sHelper(ctx context.Context) (*k8s.Client, error) {
if k.KubeHelper != nil {
return k.KubeHelper, nil
}
_, err := k.K8sClient(ctx)
if err != nil {
return nil, err
}
return k.KubeHelper, nil
}
// K8sClose closes Kubernetes client.
func (k *KubernetesClient) K8sClose() error {
if k.KubeHelper == nil {
return nil
}
return k.KubeHelper.Close()
}