/
util.go
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/
util.go
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package kutil
import (
"fmt"
"io/ioutil"
"net/http"
"os"
"reflect"
"strings"
"time"
"github.com/hashicorp/go-version"
"github.com/pkg/errors"
apiextensions "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
clientsetscheme "k8s.io/client-go/kubernetes/scheme"
apiv1 "k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/rest"
)
const (
RetryInterval = 50 * time.Millisecond
RetryTimeout = 2 * time.Second
)
func Namespace() string {
if ns := os.Getenv("KUBE_NAMESPACE"); ns != "" {
return ns
}
if data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace"); err == nil {
if ns := strings.TrimSpace(string(data)); len(ns) > 0 {
return ns
}
}
return apiv1.NamespaceDefault
}
func IsPreferredAPIResource(c clientset.Interface, groupVersion, kind string) bool {
if resourceList, err := c.Discovery().ServerPreferredResources(); err == nil {
for _, resources := range resourceList {
if resources.GroupVersion != groupVersion {
continue
}
for _, resource := range resources.APIResources {
if resources.GroupVersion == groupVersion && resource.Kind == kind {
return true
}
}
}
}
return false
}
func CheckAPIVersion(c clientset.Interface, constraint string) (bool, error) {
info, err := c.Discovery().ServerVersion()
if err != nil {
return false, err
}
cond, err := version.NewConstraint(constraint)
if err != nil {
return false, err
}
v, err := version.NewVersion(info.GitVersion)
if err != nil {
return false, err
}
return cond.Check(v.ToMutator().ResetPrerelease().ResetMetadata().Done()), nil
}
func WaitForCRDReady(restClient rest.Interface, crds []*apiextensions.CustomResourceDefinition) error {
err := wait.Poll(3*time.Second, 5*time.Minute, func() (bool, error) {
for _, crd := range crds {
res := restClient.Get().AbsPath("apis", crd.Spec.Group, crd.Spec.Version, crd.Spec.Names.Plural).Do()
err := res.Error()
if err != nil {
// RESTClient returns *apierrors.StatusError for any status codes < 200 or > 206
// and http.Client.Do errors are returned directly.
if se, ok := err.(*apierrors.StatusError); ok {
if se.Status().Code == http.StatusNotFound {
return false, nil
}
}
return false, err
}
var statusCode int
res.StatusCode(&statusCode)
if statusCode != http.StatusOK {
return false, fmt.Errorf("invalid status code: %d", statusCode)
}
}
return true, nil
})
return errors.Wrap(err, fmt.Sprintf("timed out waiting for CRD"))
}
func DeleteInBackground() *metav1.DeleteOptions {
policy := metav1.DeletePropagationBackground
return &metav1.DeleteOptions{PropagationPolicy: &policy}
}
func DeleteInForeground() *metav1.DeleteOptions {
policy := metav1.DeletePropagationForeground
return &metav1.DeleteOptions{PropagationPolicy: &policy}
}
func GetKind(v interface{}) string {
val := reflect.ValueOf(v)
if val.Kind() == reflect.Ptr {
val = val.Elem()
}
return val.Type().Name()
}
func GetObjectReference(v interface{}, gv schema.GroupVersion) *apiv1.ObjectReference {
m, err := meta.Accessor(v)
if err != nil {
return &apiv1.ObjectReference{}
}
return &apiv1.ObjectReference{
APIVersion: gv.String(),
Kind: GetKind(v),
Namespace: m.GetNamespace(),
Name: m.GetName(),
UID: m.GetUID(),
ResourceVersion: m.GetResourceVersion(),
}
}
// MarshalToYAML marshals an object into yaml.
func MarshalToYAML(obj runtime.Object, gv schema.GroupVersion) ([]byte, error) {
mediaType := "application/yaml"
info, ok := runtime.SerializerInfoForMediaType(clientsetscheme.Codecs.SupportedMediaTypes(), mediaType)
if !ok {
return []byte{}, fmt.Errorf("unsupported media type %q", mediaType)
}
encoder := clientsetscheme.Codecs.EncoderForVersion(info.Serializer, gv)
return runtime.Encode(encoder, obj)
}
// UnmarshalToYAML unmarshals an object into yaml.
func UnmarshalToYAML(data []byte, gv schema.GroupVersion) (runtime.Object, error) {
mediaType := "application/yaml"
info, ok := runtime.SerializerInfoForMediaType(clientsetscheme.Codecs.SupportedMediaTypes(), mediaType)
if !ok {
return nil, fmt.Errorf("unsupported media type %q", mediaType)
}
decoder := clientsetscheme.Codecs.DecoderToVersion(info.Serializer, gv)
return runtime.Decode(decoder, data)
}
// MarshalToJson marshals an object into json.
func MarshalToJson(obj runtime.Object, gv schema.GroupVersion) ([]byte, error) {
mediaType := "application/json"
info, ok := runtime.SerializerInfoForMediaType(clientsetscheme.Codecs.SupportedMediaTypes(), mediaType)
if !ok {
return []byte{}, fmt.Errorf("unsupported media type %q", mediaType)
}
encoder := clientsetscheme.Codecs.EncoderForVersion(info.Serializer, gv)
return runtime.Encode(encoder, obj)
}
// UnmarshalToJSON unmarshals an object into json.
func UnmarshalToJSON(data []byte, gv schema.GroupVersion) (runtime.Object, error) {
mediaType := "application/json"
info, ok := runtime.SerializerInfoForMediaType(clientsetscheme.Codecs.SupportedMediaTypes(), mediaType)
if !ok {
return nil, fmt.Errorf("unsupported media type %q", mediaType)
}
decoder := clientsetscheme.Codecs.DecoderToVersion(info.Serializer, gv)
return runtime.Decode(decoder, data)
}