/
client.go
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/
client.go
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// Copyright 2021 Flant JSC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"fmt"
"time"
klient "github.com/flant/kube-client/client"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
// oidc allows using oidc provider in kubeconfig
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
"github.com/deckhouse/deckhouse/dhctl/pkg/app"
"github.com/deckhouse/deckhouse/dhctl/pkg/log"
"github.com/deckhouse/deckhouse/dhctl/pkg/system/ssh"
"github.com/deckhouse/deckhouse/dhctl/pkg/system/ssh/frontend"
"github.com/deckhouse/deckhouse/dhctl/pkg/util/retry"
)
type KubeClient interface {
kubernetes.Interface
Dynamic() dynamic.Interface
APIResourceList(apiVersion string) ([]*metav1.APIResourceList, error)
APIResource(apiVersion, kind string) (*metav1.APIResource, error)
GroupVersionResource(apiVersion, kind string) (schema.GroupVersionResource, error)
}
// KubernetesClient connects to kubernetes API server through ssh tunnel and kubectl proxy.
type KubernetesClient struct {
KubeClient
SSHClient *ssh.Client
KubeProxy *frontend.KubeProxy
}
type KubernetesInitParams struct {
KubeConfig string
KubeConfigContext string
KubeConfigInCluster bool
}
func NewKubernetesClient() *KubernetesClient {
return &KubernetesClient{}
}
func NewFakeKubernetesClient() *KubernetesClient {
return &KubernetesClient{KubeClient: klient.NewFake(nil)}
}
func NewFakeKubernetesClientWithListGVR(gvr map[schema.GroupVersionResource]string) *KubernetesClient {
return &KubernetesClient{KubeClient: klient.NewFake(gvr)}
}
func (k *KubernetesClient) WithSSHClient(client *ssh.Client) *KubernetesClient {
k.SSHClient = client
return k
}
// Init initializes kubernetes client
func (k *KubernetesClient) Init(params *KubernetesInitParams) error {
kubeClient := klient.New()
kubeClient.WithRateLimiterSettings(30, 60)
switch {
case params.KubeConfigInCluster:
case params.KubeConfig != "":
kubeClient.WithContextName(params.KubeConfigContext)
kubeClient.WithConfigPath(params.KubeConfig)
default:
port, err := k.StartKubernetesProxy()
if err != nil {
return err
}
kubeClient.WithServer("http://localhost:" + port)
}
// Initialize kube client for kube events hooks.
err := kubeClient.Init()
if err != nil {
return fmt.Errorf("initialize kube client: %s", err)
}
k.KubeClient = kubeClient
return nil
}
// StartKubernetesProxy initializes kubectl-proxy on remote host and establishes ssh tunnel to it
func (k *KubernetesClient) StartKubernetesProxy() (port string, err error) {
if k.SSHClient == nil {
k.SSHClient, err = ssh.NewClientFromFlags().Start()
if err != nil {
return "", err
}
}
err = retry.NewLoop("Starting kube proxy", k.SSHClient.Settings.CountHosts(), 1*time.Second).Run(func() error {
log.InfoF("Using host %s\n", k.SSHClient.Settings.Host())
k.KubeProxy = k.SSHClient.KubeProxy()
port, err = k.KubeProxy.Start(-1)
if err != nil {
k.SSHClient.Settings.ChoiceNewHost()
return fmt.Errorf("start kube proxy: %v", err)
}
return nil
})
if err != nil {
return "", err
}
log.InfoF("Proxy started on port %s\n", port)
return port, nil
}
func AppKubernetesInitParams() *KubernetesInitParams {
return &KubernetesInitParams{
KubeConfig: app.KubeConfig,
KubeConfigContext: app.KubeConfigContext,
KubeConfigInCluster: app.KubeConfigInCluster,
}
}