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ssa.go
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ssa.go
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/*
SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and component-operator-runtime contributors
SPDX-License-Identifier: Apache-2.0
*/
package reconciler
import (
"bytes"
"fmt"
"strings"
"github.com/pkg/errors"
"github.com/sap/go-generics/slices"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
)
// TODO: needs refactoring
func replaceFieldManager(managedFields []metav1.ManagedFieldsEntry, managerPrefixes []string, manager string) ([]metav1.ManagedFieldsEntry, bool, error) {
var managerEntry metav1.ManagedFieldsEntry
empty := metav1.ManagedFieldsEntry{}
for _, entry := range managedFields {
if entry.Manager == manager && entry.Operation == metav1.ManagedFieldsOperationApply {
managerEntry = entry
}
}
entries := make([]metav1.ManagedFieldsEntry, 0, len(managedFields))
changed := false
for _, entry := range managedFields {
if entry == managerEntry {
continue
}
if entry.Subresource != "" {
entries = append(entries, entry)
continue
}
if entry.Manager != manager && !slices.Any(managerPrefixes, func(s string) bool { return strings.HasPrefix(entry.Manager, s) }) {
entries = append(entries, entry)
continue
}
if managerEntry == empty {
entry.Manager = manager
entry.Operation = metav1.ManagedFieldsOperationApply
managerEntry = entry
changed = true
continue
}
mergedFields, err := mergeManagedFieldsV1(managerEntry.FieldsV1, entry.FieldsV1)
if err != nil {
return nil, false, errors.Wrap(err, "unable to merge managed fields")
}
managerEntry.FieldsV1 = mergedFields
changed = true
}
return append(entries, managerEntry), changed, nil
}
func mergeManagedFieldsV1(prevField *metav1.FieldsV1, newField *metav1.FieldsV1) (*metav1.FieldsV1, error) {
if prevField == nil && newField == nil {
return nil, nil
}
if prevField == nil {
return newField, nil
}
if newField == nil {
return prevField, nil
}
prevSet, err := fieldsToSet(*prevField)
if err != nil {
return nil, err
}
newSet, err := fieldsToSet(*newField)
if err != nil {
return nil, err
}
unionSet := prevSet.Union(&newSet)
mergedField, err := setToFields(*unionSet)
if err != nil {
return nil, fmt.Errorf("unable to convert managed set to field: %s", err)
}
return &mergedField, nil
}
func fieldsToSet(f metav1.FieldsV1) (s fieldpath.Set, err error) {
err = s.FromJSON(bytes.NewReader(f.Raw))
return s, err
}
func setToFields(s fieldpath.Set) (f metav1.FieldsV1, err error) {
f.Raw, err = s.ToJSON()
return f, err
}