mirror of https://github.com/k3s-io/k3s
131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
/*
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Copyright 2017 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 checkpoint
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import (
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"encoding/json"
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"fmt"
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"k8s.io/klog"
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"k8s.io/api/core/v1"
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"k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
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"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/checksum"
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)
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const (
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// Delimiter used on checkpoints written to disk
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delimiter = "_"
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podPrefix = "Pod"
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)
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// PodCheckpoint defines the operations to retrieve pod
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type PodCheckpoint interface {
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checkpointmanager.Checkpoint
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GetPod() *v1.Pod
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}
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// Data to be stored as checkpoint
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type Data struct {
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Pod *v1.Pod
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Checksum checksum.Checksum
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}
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// NewPodCheckpoint returns new pod checkpoint
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func NewPodCheckpoint(pod *v1.Pod) PodCheckpoint {
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return &Data{Pod: pod}
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}
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// MarshalCheckpoint returns marshalled data
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func (cp *Data) MarshalCheckpoint() ([]byte, error) {
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cp.Checksum = checksum.New(*cp.Pod)
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return json.Marshal(*cp)
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}
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// UnmarshalCheckpoint returns unmarshalled data
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func (cp *Data) UnmarshalCheckpoint(blob []byte) error {
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return json.Unmarshal(blob, cp)
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}
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// VerifyChecksum verifies that passed checksum is same as calculated checksum
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func (cp *Data) VerifyChecksum() error {
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return cp.Checksum.Verify(*cp.Pod)
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}
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// GetPod retrieves the pod from the checkpoint
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func (cp *Data) GetPod() *v1.Pod {
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return cp.Pod
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}
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// checkAnnotations will validate the checkpoint annotations exist on the Pod
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func checkAnnotations(pod *v1.Pod) bool {
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if podAnnotations := pod.GetAnnotations(); podAnnotations != nil {
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if podAnnotations[core.BootstrapCheckpointAnnotationKey] == "true" {
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return true
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}
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}
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return false
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}
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//getPodKey returns the full qualified path for the pod checkpoint
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func getPodKey(pod *v1.Pod) string {
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return fmt.Sprintf("%s%s%v.yaml", podPrefix, delimiter, pod.GetUID())
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}
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// LoadPods Loads All Checkpoints from disk
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func LoadPods(cpm checkpointmanager.CheckpointManager) ([]*v1.Pod, error) {
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pods := make([]*v1.Pod, 0)
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var err error
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checkpointKeys := []string{}
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checkpointKeys, err = cpm.ListCheckpoints()
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if err != nil {
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klog.Errorf("Failed to list checkpoints: %v", err)
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}
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for _, key := range checkpointKeys {
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checkpoint := NewPodCheckpoint(nil)
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err := cpm.GetCheckpoint(key, checkpoint)
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if err != nil {
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klog.Errorf("Failed to retrieve checkpoint for pod %q: %v", key, err)
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continue
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}
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pods = append(pods, checkpoint.GetPod())
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}
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return pods, nil
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}
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// WritePod a checkpoint to a file on disk if annotation is present
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func WritePod(cpm checkpointmanager.CheckpointManager, pod *v1.Pod) error {
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var err error
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if checkAnnotations(pod) {
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data := NewPodCheckpoint(pod)
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err = cpm.CreateCheckpoint(getPodKey(pod), data)
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} else {
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// This is to handle an edge where a pod update could remove
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// an annotation and the checkpoint should then be removed.
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err = cpm.RemoveCheckpoint(getPodKey(pod))
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}
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return err
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}
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// DeletePod deletes a checkpoint from disk if present
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func DeletePod(cpm checkpointmanager.CheckpointManager, pod *v1.Pod) error {
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return cpm.RemoveCheckpoint(getPodKey(pod))
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}
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