forked from operator-framework/operator-sdk
/
k8sutil.go
136 lines (120 loc) · 4.16 KB
/
k8sutil.go
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// Copyright 2018 The Operator-SDK Authors
//
// 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 k8sutil
import (
"encoding/json"
"fmt"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
cgoscheme "k8s.io/client-go/kubernetes/scheme"
)
var (
// scheme tracks the type registry for the sdk
// This scheme is used to decode json data into the correct Go type based on the object's GVK
// All types that the operator watches must be added to this scheme
scheme = runtime.NewScheme()
codecs = serializer.NewCodecFactory(scheme)
)
func init() {
// Add the standard kubernetes [GVK:Types] type registry
// e.g (v1,Pods):&v1.Pod{}
metav1.AddToGroupVersion(scheme, schema.GroupVersion{Version: "v1"})
cgoscheme.AddToScheme(scheme)
}
func decoder(gv schema.GroupVersion) runtime.Decoder {
codec := codecs.UniversalDecoder(gv)
return codec
}
type addToSchemeFunc func(*runtime.Scheme) error
// AddToSDKScheme allows CRDs to register their types with the sdk scheme
func AddToSDKScheme(addToScheme addToSchemeFunc) {
addToScheme(scheme)
}
// RuntimeObjectFromUnstructured converts an unstructured to a runtime object
func RuntimeObjectFromUnstructured(u *unstructured.Unstructured) runtime.Object {
gvk := u.GroupVersionKind()
decoder := decoder(gvk.GroupVersion())
b, err := u.MarshalJSON()
if err != nil {
panic(err)
}
ro, _, err := decoder.Decode(b, &gvk, nil)
if err != nil {
err = fmt.Errorf("failed to decode json data with gvk(%v): %v", gvk.String(), err)
panic(err)
}
return ro
}
// UnstructuredFromRuntimeObject converts a runtime object to an unstructured
func UnstructuredFromRuntimeObject(ro runtime.Object) *unstructured.Unstructured {
b, err := json.Marshal(ro)
if err != nil {
panic(err)
}
var u unstructured.Unstructured
if err := json.Unmarshal(b, &u.Object); err != nil {
panic(err)
}
return &u
}
// UnstructuredIntoRuntimeObject unmarshalls an unstructured into a given runtime object
// TODO: https://github.com/operator-framework/operator-sdk/issues/127
func UnstructuredIntoRuntimeObject(u *unstructured.Unstructured, into runtime.Object) error {
gvk := u.GroupVersionKind()
decoder := decoder(gvk.GroupVersion())
b, err := u.MarshalJSON()
if err != nil {
return err
}
_, _, err = decoder.Decode(b, &gvk, into)
if err != nil {
return fmt.Errorf("failed to decode json data with gvk(%v): %v", gvk.String(), err)
}
return nil
}
// RuntimeObjectIntoRuntimeObject unmarshalls an runtime.Object into a given runtime object
func RuntimeObjectIntoRuntimeObject(from runtime.Object, into runtime.Object) error {
b, err := json.Marshal(from)
if err != nil {
return err
}
gvk := from.GetObjectKind().GroupVersionKind()
decoder := decoder(gvk.GroupVersion())
_, _, err = decoder.Decode(b, &gvk, into)
if err != nil {
return fmt.Errorf("failed to decode json data with gvk(%v): %v", gvk.String(), err)
}
return nil
}
// GetNameAndNamespace extracts the name and namespace from the given runtime.Object
// and returns a error if any of those is missing.
func GetNameAndNamespace(object runtime.Object) (string, string, error) {
accessor := meta.NewAccessor()
name, err := accessor.Name(object)
if err != nil {
return "", "", fmt.Errorf("failed to get name for object: %v", err)
}
namespace, err := accessor.Namespace(object)
if err != nil {
return "", "", fmt.Errorf("failed to get namespace for object: %v", err)
}
return name, namespace, nil
}
func ObjectInfo(kind, name, namespace string) string {
return kind + ": " + namespace + "/" + name
}