/
k8s.go
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/
k8s.go
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package k8scli
import (
"context"
"net/http"
"os"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/portforward"
"k8s.io/client-go/tools/remotecommand"
"k8s.io/client-go/transport/spdy"
"github.com/urfave/cli/v2"
)
type Context struct {
*cli.Context
k8sClient *kubernetes.Clientset
kubeConfig *restclient.Config
namespace string
}
type ActionFunc func(ctx *Context) error
// WithK8S is a wrapper for cli.ActionFunc to add kubernetes API capabilities.
func WithK8S(fn ActionFunc) cli.ActionFunc {
return func(c *cli.Context) error {
k8sContext := &Context{}
k8sContext.Context = c
if err := k8sContext.init(); err != nil {
return err
}
return fn(k8sContext)
}
}
func (c *Context) init() error {
loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
loadingRules, &clientcmd.ConfigOverrides{},
).ClientConfig()
if err != nil {
return err
}
c.kubeConfig = config
// create the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
c.k8sClient = clientset
clientCfg, err := clientcmd.NewDefaultClientConfigLoadingRules().Load()
if err != nil {
return err
}
namespace := c.String("namespace")
if namespace == "" {
namespace = clientCfg.Contexts[clientCfg.CurrentContext].Namespace
}
c.namespace = namespace
return err
}
func (c *Context) Exec(ctx context.Context, namespace, podName string, cmd ...string) error {
req := c.k8sClient.CoreV1().RESTClient().Post().
Resource("pods").
Name(podName).
Namespace(namespace).
SubResource("exec")
option := &v1.PodExecOptions{
Command: cmd,
Stdin: false,
Stdout: true,
Stderr: true,
TTY: false,
}
req.VersionedParams(
option,
scheme.ParameterCodec,
)
exec, err := remotecommand.NewSPDYExecutor(c.kubeConfig, "POST", req.URL())
if err != nil {
return err
}
err = exec.StreamWithContext(ctx, remotecommand.StreamOptions{
Stdin: nil,
Stdout: os.Stdout,
Stderr: os.Stderr,
})
if err != nil {
return err
}
return nil
}
func (c *Context) PortForward(ctx context.Context, namespace, podName, localPort, remotePort string, readyCh chan struct{}) error {
transport, upgrader, err := spdy.RoundTripperFor(c.kubeConfig)
if err != nil {
return err
}
reqURL := c.k8sClient.RESTClient().Post().
Prefix("api/v1/"). // FIXME: prefix is a hacky way to get the correct URL
Resource("pods").
Namespace(namespace).
Name(podName).
SubResource("portforward").URL()
stopCh := make(chan struct{})
dialer := spdy.NewDialer(upgrader, &http.Client{Transport: transport}, http.MethodPost, reqURL)
fw, err := portforward.New(dialer, []string{localPort + ":" + remotePort}, stopCh, readyCh, os.Stdout, os.Stdout)
if err != nil {
return err
}
go func() {
<-ctx.Done()
stopCh <- struct{}{}
}()
if err := fw.ForwardPorts(); err != nil {
return err
}
return nil
}
func (c *Context) Ctx() context.Context {
return c.Context.Context
}
func (c *Context) Namespace() string {
return c.namespace
}
func (c *Context) KubeClient() *kubernetes.Clientset {
return c.k8sClient
}
func (c *Context) KubeConfig() *restclient.Config {
return c.kubeConfig
}