forked from ksonnet/ksonnet
/
object.go
148 lines (125 loc) · 3.83 KB
/
object.go
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// Copyright 2018 The ksonnet 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 cluster
import (
"encoding/json"
"github.com/pkg/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/clientcmd"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
)
// SetMetaDataLabel sets a label value
func SetMetaDataLabel(obj metav1.Object, key, value string) {
labels := obj.GetLabels()
if labels == nil {
labels = make(map[string]string)
}
labels[key] = value
obj.SetLabels(labels)
}
// SetMetaDataAnnotation sets an annotation value
func SetMetaDataAnnotation(obj metav1.Object, key, value string) {
a := obj.GetAnnotations()
if a == nil {
a = make(map[string]string)
}
a[key] = value
obj.SetAnnotations(a)
}
// DefaultResourceInfo fetches objects from the cluster.
func DefaultResourceInfo(namespace string, config clientcmd.ClientConfig) *resource.Result {
factory := kcmdutil.NewFactory(config)
return factory.NewBuilder().
Unstructured().
NamespaceParam(namespace).
ExportParam(false).
ResourceTypeOrNameArgs(true, "all").
LabelSelectorParam("app.kubernetes.io/deploy-manager=ksonnet").
ContinueOnError().
Flatten().
IncludeUninitialized(false).
RequireObject(true).
Latest().
Do()
}
// ResourceInfo holds information about cluster resources.
type ResourceInfo interface {
Err() error
Infos() ([]*resource.Info, error)
}
var _ ResourceInfo = (*resource.Result)(nil)
// ManagedObjects returns a slice of ksonnet managed objects.
func ManagedObjects(r ResourceInfo) ([]*unstructured.Unstructured, error) {
if err := r.Err(); err != nil {
return nil, errors.WithStack(err)
}
infos, err := r.Infos()
if err != nil {
return nil, errors.WithStack(err)
}
lookup := make(map[types.UID]map[string]interface{})
var objects []*unstructured.Unstructured
for i := range infos {
if obj, ok := infos[i].Object.(*unstructured.Unstructured); ok {
if _, ok := lookup[obj.GetUID()]; ok {
// we've seen this object already
continue
}
lookup[obj.GetUID()] = obj.Object
objects = append(objects, obj)
}
}
return objects, nil
}
// RebuildObject rebuilds the ksonnet generated object from an object on
// the cluster.
func RebuildObject(m map[string]interface{}) (map[string]interface{}, error) {
metadata, ok := m["metadata"].(map[string]interface{})
if !ok {
return nil, errors.New("metadata not found")
}
annotations, ok := metadata["annotations"].(map[string]interface{})
if !ok {
return nil, errors.New("metadata annotations not found")
}
descriptor, ok := annotations[annotationManaged].(string)
if !ok {
return m, nil
}
var mm managedMetadata
if err := json.Unmarshal([]byte(descriptor), &mm); err != nil {
return nil, errors.WithStack(err)
}
return mm.DecodePristine()
}
// CollectObjects collects objects in a cluster namespace.
func CollectObjects(namespace string, config clientcmd.ClientConfig) ([]*unstructured.Unstructured, error) {
res := DefaultResourceInfo(namespace, config)
objects, err := ManagedObjects(res)
if err != nil {
return nil, err
}
for _, obj := range objects {
m, err := RebuildObject(obj.Object)
if err != nil {
return nil, err
}
obj.Object = m
}
return objects, nil
}