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conflictdetector.go
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conflictdetector.go
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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package patch
import (
"encoding/json"
"fmt"
jsonpatch "github.com/evanphx/json-patch"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/mergepatch"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/client-go/kubernetes/scheme"
"sigs.k8s.io/kustomize/api/resid"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/resource"
)
type conflictDetector interface {
hasConflict(patch1, patch2 *resource.Resource) (bool, error)
findConflict(conflictingPatchIdx int, patches []*resource.Resource) (*resource.Resource, error)
mergePatches(patch1, patch2 *resource.Resource) (*resource.Resource, error)
}
type jsonMergePatch struct {
rf *resource.Factory
}
var _ conflictDetector = &jsonMergePatch{}
func newJMPConflictDetector(rf *resource.Factory) conflictDetector {
return &jsonMergePatch{rf: rf}
}
func (jmp *jsonMergePatch) hasConflict(
patch1, patch2 *resource.Resource) (bool, error) {
return mergepatch.HasConflicts(patch1.Map(), patch2.Map())
}
func (jmp *jsonMergePatch) findConflict(
conflictingPatchIdx int, patches []*resource.Resource) (*resource.Resource, error) {
for i, patch := range patches {
if i == conflictingPatchIdx {
continue
}
if !patches[conflictingPatchIdx].OrgId().Equals(patch.OrgId()) {
continue
}
conflict, err := mergepatch.HasConflicts(
patch.Map(),
patches[conflictingPatchIdx].Map())
if err != nil {
return nil, err
}
if conflict {
return patch, nil
}
}
return nil, nil
}
func (jmp *jsonMergePatch) mergePatches(
patch1, patch2 *resource.Resource) (*resource.Resource, error) {
baseBytes, err := json.Marshal(patch1.Map())
if err != nil {
return nil, err
}
patchBytes, err := json.Marshal(patch2.Map())
if err != nil {
return nil, err
}
mergedBytes, err := jsonpatch.MergeMergePatches(baseBytes, patchBytes)
if err != nil {
return nil, err
}
mergedMap := make(map[string]interface{})
err = json.Unmarshal(mergedBytes, &mergedMap)
return jmp.rf.FromMap(mergedMap), err
}
type strategicMergePatch struct {
lookupPatchMeta strategicpatch.LookupPatchMeta
rf *resource.Factory
}
var _ conflictDetector = &strategicMergePatch{}
func newSMPConflictDetector(
versionedObj runtime.Object,
rf *resource.Factory) (conflictDetector, error) {
lookupPatchMeta, err := strategicpatch.NewPatchMetaFromStruct(versionedObj)
return &strategicMergePatch{lookupPatchMeta: lookupPatchMeta, rf: rf}, err
}
func (smp *strategicMergePatch) hasConflict(p1, p2 *resource.Resource) (bool, error) {
return strategicpatch.MergingMapsHaveConflicts(
p1.Map(), p2.Map(), smp.lookupPatchMeta)
}
func (smp *strategicMergePatch) findConflict(
conflictingPatchIdx int, patches []*resource.Resource) (*resource.Resource, error) {
for i, patch := range patches {
if i == conflictingPatchIdx {
continue
}
if !patches[conflictingPatchIdx].OrgId().Equals(patch.OrgId()) {
continue
}
conflict, err := strategicpatch.MergingMapsHaveConflicts(
patch.Map(),
patches[conflictingPatchIdx].Map(),
smp.lookupPatchMeta)
if err != nil {
return nil, err
}
if conflict {
return patch, nil
}
}
return nil, nil
}
func (smp *strategicMergePatch) mergePatches(patch1, patch2 *resource.Resource) (*resource.Resource, error) {
if hasDeleteDirectiveMarker(patch2.Map()) {
if hasDeleteDirectiveMarker(patch1.Map()) {
return nil, fmt.Errorf("cannot merge patches both containing '$patch: delete' directives")
}
patch1, patch2 = patch2, patch1
}
mergeJSONMap, err := strategicpatch.MergeStrategicMergeMapPatchUsingLookupPatchMeta(
smp.lookupPatchMeta, patch1.Map(), patch2.Map())
return smp.rf.FromMap(mergeJSONMap), err
}
// MergePatches merge and index patches by OrgId.
// It errors out if there is conflict between patches.
func MergePatches(patches []*resource.Resource,
rf *resource.Factory) (resmap.ResMap, error) {
rc := resmap.New()
for ix, patch := range patches {
id := patch.OrgId()
existing := rc.GetMatchingResourcesByOriginalId(id.Equals)
if len(existing) == 0 {
rc.Append(patch)
continue
}
if len(existing) > 1 {
return nil, fmt.Errorf("self conflict in patches")
}
versionedObj, err := scheme.Scheme.New(toSchemaGvk(id.Gvk))
if err != nil && !runtime.IsNotRegisteredError(err) {
return nil, err
}
var cd conflictDetector
if err != nil {
cd = newJMPConflictDetector(rf)
} else {
cd, err = newSMPConflictDetector(versionedObj, rf)
if err != nil {
return nil, err
}
}
conflict, err := cd.hasConflict(existing[0], patch)
if err != nil {
return nil, err
}
if conflict {
conflictingPatch, err := cd.findConflict(ix, patches)
if err != nil {
return nil, err
}
return nil, fmt.Errorf(
"conflict between %#v and %#v",
conflictingPatch.Map(), patch.Map())
}
merged, err := cd.mergePatches(existing[0], patch)
if err != nil {
return nil, err
}
rc.Replace(merged)
}
return rc, nil
}
// toSchemaGvk converts to a schema.GroupVersionKind.
func toSchemaGvk(x resid.Gvk) schema.GroupVersionKind {
return schema.GroupVersionKind{
Group: x.Group,
Version: x.Version,
Kind: x.Kind,
}
}
func hasDeleteDirectiveMarker(patch map[string]interface{}) bool {
if v, ok := patch["$patch"]; ok && v == "delete" {
return true
}
for _, v := range patch {
switch typedV := v.(type) {
case map[string]interface{}:
if hasDeleteDirectiveMarker(typedV) {
return true
}
case []interface{}:
for _, sv := range typedV {
typedE, ok := sv.(map[string]interface{})
if !ok {
break
}
if hasDeleteDirectiveMarker(typedE) {
return true
}
}
}
}
return false
}