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b252865479
In an e2e run, out of 1857 pod status updates executed by the Kubelet 453 (25%) were no-ops - they only contained the UID of the pod and no status changes. If the patch is a no-op we can avoid invoking the server and continue.
71 lines
2.6 KiB
Go
71 lines
2.6 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 pod
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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clientset "k8s.io/client-go/kubernetes"
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)
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// PatchPodStatus patches pod status. It returns true and avoids an update if the patch contains no changes.
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func PatchPodStatus(c clientset.Interface, namespace, name string, uid types.UID, oldPodStatus, newPodStatus v1.PodStatus) (*v1.Pod, []byte, bool, error) {
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patchBytes, unchanged, err := preparePatchBytesForPodStatus(namespace, name, uid, oldPodStatus, newPodStatus)
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if err != nil {
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return nil, nil, false, err
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}
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if unchanged {
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return nil, patchBytes, true, nil
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}
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updatedPod, err := c.CoreV1().Pods(namespace).Patch(context.TODO(), name, types.StrategicMergePatchType, patchBytes, metav1.PatchOptions{}, "status")
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if err != nil {
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return nil, nil, false, fmt.Errorf("failed to patch status %q for pod %q/%q: %v", patchBytes, namespace, name, err)
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}
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return updatedPod, patchBytes, false, nil
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}
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func preparePatchBytesForPodStatus(namespace, name string, uid types.UID, oldPodStatus, newPodStatus v1.PodStatus) ([]byte, bool, error) {
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oldData, err := json.Marshal(v1.Pod{
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Status: oldPodStatus,
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})
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if err != nil {
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return nil, false, fmt.Errorf("failed to Marshal oldData for pod %q/%q: %v", namespace, name, err)
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}
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newData, err := json.Marshal(v1.Pod{
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ObjectMeta: metav1.ObjectMeta{UID: uid}, // only put the uid in the new object to ensure it appears in the patch as a precondition
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Status: newPodStatus,
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})
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if err != nil {
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return nil, false, fmt.Errorf("failed to Marshal newData for pod %q/%q: %v", namespace, name, err)
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}
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patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Pod{})
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if err != nil {
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return nil, false, fmt.Errorf("failed to CreateTwoWayMergePatch for pod %q/%q: %v", namespace, name, err)
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}
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return patchBytes, bytes.Equal(patchBytes, []byte(fmt.Sprintf(`{"metadata":{"uid":%q}}`, uid))), nil
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}
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