/
patch.go
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/
patch.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 controller
import (
"context"
"reflect"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/wait"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// TryPatch tries to apply the given transformation function onto the given object, and to patch it afterwards with optimistic locking.
// It retries the patch with an exponential backoff.
func TryPatch(ctx context.Context, backoff wait.Backoff, c client.Client, obj client.Object, transform func() error) error {
return tryPatch(ctx, backoff, c, obj, c.Patch, transform)
}
// TryPatchStatus tries to apply the given transformation function onto the given object, and to patch its
// status afterwards with optimistic locking. It retries the status patch with an exponential backoff.
func TryPatchStatus(ctx context.Context, backoff wait.Backoff, c client.Client, obj client.Object, transform func() error) error {
return tryPatch(ctx, backoff, c, obj, c.Status().Patch, transform)
}
func tryPatch(ctx context.Context, backoff wait.Backoff, c client.Client, obj client.Object, patchFunc func(context.Context, client.Object, client.Patch, ...client.PatchOption) error, transform func() error) error {
resetCopy := obj.DeepCopyObject()
return exponentialBackoff(ctx, backoff, func() (bool, error) {
if err := c.Get(ctx, client.ObjectKeyFromObject(obj), obj); err != nil {
return false, err
}
beforeTransform := obj.DeepCopyObject().(client.Object)
if err := transform(); err != nil {
return false, err
}
if reflect.DeepEqual(obj, beforeTransform) {
return true, nil
}
patch := client.MergeFromWithOptions(beforeTransform, client.MergeFromWithOptimisticLock{})
if err := patchFunc(ctx, obj, patch); err != nil {
if apierrors.IsConflict(err) {
reflect.ValueOf(obj).Elem().Set(reflect.ValueOf(resetCopy).Elem())
return false, nil
}
return false, err
}
return true, nil
})
}