97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transformers
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import (
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"encoding/json"
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"fmt"
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jsonpatch "github.com/evanphx/json-patch"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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"k8s.io/kubectl/pkg/kinflate/types"
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"k8s.io/kubectl/pkg/scheme"
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)
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// overlayTransformer contains a map of overlay objects
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type overlayTransformer struct {
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overlay types.KObject
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}
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var _ Transformer = &overlayTransformer{}
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// NewOverlayTransformer constructs a overlayTransformer.
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func NewOverlayTransformer(overlay types.KObject) (Transformer, error) {
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if len(overlay) == 0 {
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return NewNoOpTransformer(), nil
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}
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return &overlayTransformer{overlay}, nil
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}
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// Transform apply the overlay on top of the base resources.
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func (o *overlayTransformer) Transform(baseResourceMap types.KObject) error {
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// Strategic merge the resources exist in both base and overlay.
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for gvkn, overlay := range o.overlay {
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// Merge overlay with base resource.
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base, found := baseResourceMap[gvkn]
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if !found {
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return fmt.Errorf("failed to find an object with %#v to apply the patch", gvkn.GVK)
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}
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merged := map[string]interface{}{}
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versionedObj, err := scheme.Scheme.New(gvkn.GVK)
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baseName := base.GetName()
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switch {
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case runtime.IsNotRegisteredError(err):
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// Use JSON merge patch to handle types w/o schema
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baseBytes, err := json.Marshal(base)
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if err != nil {
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return err
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}
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patchBytes, err := json.Marshal(overlay)
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if err != nil {
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return err
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}
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mergedBytes, err := jsonpatch.MergePatch(baseBytes, patchBytes)
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if err != nil {
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return err
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}
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err = json.Unmarshal(mergedBytes, &merged)
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if err != nil {
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return err
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}
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case err != nil:
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return err
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default:
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// Use Strategic Merge Patch to handle types w/ schema
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// TODO: Change this to use the new Merge package.
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// Store the name of the base object, because this name may have been munged.
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// Apply this name to the StrategicMergePatched object.
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merged, err = strategicpatch.StrategicMergeMapPatch(
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base.UnstructuredContent(),
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overlay.UnstructuredContent(),
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versionedObj)
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if err != nil {
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return err
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}
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}
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base.SetName(baseName)
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baseResourceMap[gvkn].Object = merged
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}
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return nil
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}
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