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115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
package k8s
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import (
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"context"
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"io/ioutil"
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"os"
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"github.com/crazy-max/diun/v4/pkg/utl"
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"github.com/pkg/errors"
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"github.com/rs/zerolog/log"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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)
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// Client represents an active kubernetes object
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type Client struct {
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ctx context.Context
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API *kubernetes.Clientset
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}
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// Options holds kubernetes client object options
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type Options struct {
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Endpoint string
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Token string
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TokenFile string
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TLSCAFile string
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TLSInsecure *bool
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}
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// New initializes a new Kubernetes client
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func New(opts Options) (*Client, error) {
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var err error
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var cl *kubernetes.Clientset
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switch {
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case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "":
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log.Debug().Msgf("Creating in-cluster Kubernetes provider client %s", opts.Endpoint)
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cl, err = newInClusterClient(opts)
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case os.Getenv("KUBECONFIG") != "":
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log.Debug().Msgf("Creating cluster-external Kubernetes provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG"))
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cl, err = newExternalClusterClientFromFile(opts, os.Getenv("KUBECONFIG"))
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default:
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log.Debug().Msgf("Creating cluster-external Kubernetes provider client %s", opts.Endpoint)
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cl, err = newExternalClusterClient(opts)
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}
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return &Client{
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ctx: context.Background(),
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API: cl,
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}, err
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}
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func newInClusterClient(opts Options) (*kubernetes.Clientset, error) {
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config, err := rest.InClusterConfig()
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if err != nil {
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return nil, errors.Wrap(err, "failed to create in-cluster configuration")
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}
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if opts.Endpoint != "" {
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config.Host = opts.Endpoint
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}
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if opts.TLSInsecure != nil {
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config.TLSClientConfig.Insecure = *opts.TLSInsecure
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}
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return kubernetes.NewForConfig(config)
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}
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func newExternalClusterClientFromFile(opts Options, file string) (*kubernetes.Clientset, error) {
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configFromFlags, err := clientcmd.BuildConfigFromFlags("", file)
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if err != nil {
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return nil, err
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}
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if opts.TLSInsecure != nil {
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configFromFlags.TLSClientConfig.Insecure = *opts.TLSInsecure
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}
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configFromFlags.TLSClientConfig.Insecure = true
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return kubernetes.NewForConfig(configFromFlags)
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}
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func newExternalClusterClient(opts Options) (*kubernetes.Clientset, error) {
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var err error
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if opts.Endpoint == "" {
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return nil, errors.New("Endpoint missing for external cluster client")
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}
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opts.Token, err = utl.GetSecret(opts.Token, opts.TokenFile)
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if err != nil {
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return nil, errors.Wrap(err, "Cannot retrieve bearer token")
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}
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config := &rest.Config{
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Host: opts.Endpoint,
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BearerToken: opts.Token,
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}
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if opts.TLSCAFile != "" {
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caData, err := ioutil.ReadFile(opts.TLSCAFile)
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if err != nil {
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return nil, errors.Wrap(err, "Failed to read CA file")
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}
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config.TLSClientConfig = rest.TLSClientConfig{
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CAData: caData,
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}
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}
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if opts.TLSInsecure != nil {
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config.TLSClientConfig.Insecure = *opts.TLSInsecure
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}
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return kubernetes.NewForConfig(config)
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}
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