forked from rook/rook
Sébastien Han
a137b31e1a
Clean and refactor code helper for controller-runtime. Implement those into the block pool controller. Signed-off-by: Sébastien Han <seb@redhat.com>
95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
/*
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Copyright 2020 The Rook Authors. All rights reserved.
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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 controller
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import (
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"encoding/json"
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"github.com/banzaicloud/k8s-objectmatcher/patch"
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime"
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"sigs.k8s.io/controller-runtime/pkg/event"
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"sigs.k8s.io/controller-runtime/pkg/predicate"
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)
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// WatchUpdatePredicate is a special update filter for update events
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// do not reconcile if the the status changes, this avoids a reconcile storm loop
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//
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// returning 'true' means triggering a reconciliation
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// returning 'false' means do NOT trigger a reconciliation
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func WatchUpdatePredicate() predicate.Funcs {
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return predicate.Funcs{
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UpdateFunc: func(e event.UpdateEvent) bool {
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objectChanged, err := objectChanged(e.ObjectOld, e.ObjectNew)
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if err != nil {
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logger.Errorf("failed to check if object changed. %v", err)
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}
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if !objectChanged {
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return false
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}
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return true
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},
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}
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}
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// objectChanged checks whether the object has been updated
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func objectChanged(oldObj, newObj runtime.Object) (bool, error) {
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old := oldObj.DeepCopyObject()
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new := newObj.DeepCopyObject()
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// Set resource version
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accessor := meta.NewAccessor()
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currentResourceVersion, err := accessor.ResourceVersion(old)
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if err == nil {
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accessor.SetResourceVersion(new, currentResourceVersion)
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}
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// Calculate diff between old and new object
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diff, err := patch.DefaultPatchMaker.Calculate(old, new)
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if err != nil {
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return true, errors.Wrap(err, "failed to calculate object diff")
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} else if diff.IsEmpty() {
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return false, nil
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}
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logger.Debugf("%v", diff.String())
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// It looks like there is a diff
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// if the status changed, we do nothing
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var patch map[string]interface{}
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json.Unmarshal(diff.Patch, &patch)
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delete(patch, "status")
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if len(patch) == 0 {
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return false, nil
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}
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// Get object meta
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objectMeta, err := meta.Accessor(newObj)
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if err != nil {
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return true, errors.Wrap(err, "failed to get object meta")
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}
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// This handles the case where the object is deleted
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spec := patch["spec"]
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if spec != nil {
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logger.Infof("object spec %q changed with %v", objectMeta.GetName(), spec)
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}
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return true, nil
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}
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