DockerCLI/cli/command/stack/kubernetes/cli.go

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package kubernetes
import (
"fmt"
"net"
"net/url"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/kubernetes"
cliv1beta1 "github.com/docker/cli/kubernetes/client/clientset/typed/compose/v1beta1"
flag "github.com/spf13/pflag"
kubeclient "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
)
// KubeCli holds kubernetes specifics (client, namespace) with the command.Cli
type KubeCli struct {
command.Cli
kubeConfig *restclient.Config
kubeNamespace string
clientSet *kubeclient.Clientset
}
// Options contains resolved parameters to initialize kubernetes clients
type Options struct {
Namespace string
Config string
}
// NewOptions returns an Options initialized with command line flags
func NewOptions(flags *flag.FlagSet) Options {
var opts Options
if namespace, err := flags.GetString("namespace"); err == nil {
opts.Namespace = namespace
}
if kubeConfig, err := flags.GetString("kubeconfig"); err == nil {
opts.Config = kubeConfig
}
return opts
}
// AddNamespaceFlag adds the namespace flag to the given flag set
func AddNamespaceFlag(flags *flag.FlagSet) {
flags.String("namespace", "", "Kubernetes namespace to use")
flags.SetAnnotation("namespace", "kubernetes", nil)
}
// WrapCli wraps command.Cli with kubernetes specifics
func WrapCli(dockerCli command.Cli, opts Options) (*KubeCli, error) {
cli := &KubeCli{
Cli: dockerCli,
}
clientConfig := kubernetes.NewKubernetesConfig(opts.Config)
cli.kubeNamespace = opts.Namespace
if opts.Namespace == "" {
configNamespace, _, err := clientConfig.Namespace()
if err != nil {
return nil, err
}
cli.kubeNamespace = configNamespace
}
config, err := clientConfig.ClientConfig()
if err != nil {
return nil, err
}
cli.kubeConfig = config
clientSet, err := kubeclient.NewForConfig(config)
if err != nil {
return nil, err
}
cli.clientSet = clientSet
if dockerCli.ClientInfo().HasAll() {
if err := cli.checkHostsMatch(); err != nil {
return nil, err
}
}
return cli, nil
}
func (c *KubeCli) composeClient() (*Factory, error) {
return NewFactory(c.kubeNamespace, c.kubeConfig, c.clientSet)
}
func (c *KubeCli) checkHostsMatch() error {
daemonEndpoint, err := url.Parse(c.Client().DaemonHost())
if err != nil {
return err
}
kubeEndpoint, err := url.Parse(c.kubeConfig.Host)
if err != nil {
return err
}
if daemonEndpoint.Hostname() == kubeEndpoint.Hostname() {
return nil
}
// The daemon can be local in Docker for Desktop, e.g. "npipe", "unix", ...
if daemonEndpoint.Scheme != "tcp" {
ips, err := net.LookupIP(kubeEndpoint.Hostname())
if err != nil {
return err
}
for _, ip := range ips {
if ip.IsLoopback() {
return nil
}
}
}
fmt.Fprintf(c.Err(), "WARNING: Swarm and Kubernetes hosts do not match (docker host=%s, kubernetes host=%s).\n"+
" Update $DOCKER_HOST (or pass -H), or use 'kubectl config use-context' to match.\n", daemonEndpoint.Hostname(), kubeEndpoint.Hostname())
return nil
}
func (c *KubeCli) stacksv1beta1() (cliv1beta1.StackInterface, error) {
raw, err := newStackV1Beta1(c.kubeConfig, c.kubeNamespace)
if err != nil {
return nil, err
}
return raw.stacks, nil
}