mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-31 22:01:06 +00:00
128 lines
4.6 KiB
Go
128 lines
4.6 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
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 pod
|
|
|
|
import (
|
|
"k8s.io/api/core/v1"
|
|
"k8s.io/apimachinery/pkg/api/errors"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/types"
|
|
clientset "k8s.io/client-go/kubernetes"
|
|
"k8s.io/klog"
|
|
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
|
|
kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
|
|
)
|
|
|
|
// MirrorClient knows how to create/delete a mirror pod in the API server.
|
|
type MirrorClient interface {
|
|
// CreateMirrorPod creates a mirror pod in the API server for the given
|
|
// pod or returns an error. The mirror pod will have the same annotations
|
|
// as the given pod as well as an extra annotation containing the hash of
|
|
// the static pod.
|
|
CreateMirrorPod(pod *v1.Pod) error
|
|
// DeleteMirrorPod deletes the mirror pod with the given full name from
|
|
// the API server or returns an error.
|
|
DeleteMirrorPod(podFullName string, uid *types.UID) (bool, error)
|
|
}
|
|
|
|
// basicMirrorClient is a functional MirrorClient. Mirror pods are stored in
|
|
// the kubelet directly because they need to be in sync with the internal
|
|
// pods.
|
|
type basicMirrorClient struct {
|
|
apiserverClient clientset.Interface
|
|
}
|
|
|
|
// NewBasicMirrorClient returns a new MirrorClient.
|
|
func NewBasicMirrorClient(apiserverClient clientset.Interface) MirrorClient {
|
|
return &basicMirrorClient{apiserverClient: apiserverClient}
|
|
}
|
|
|
|
func (mc *basicMirrorClient) CreateMirrorPod(pod *v1.Pod) error {
|
|
if mc.apiserverClient == nil {
|
|
return nil
|
|
}
|
|
// Make a copy of the pod.
|
|
copyPod := *pod
|
|
copyPod.Annotations = make(map[string]string)
|
|
|
|
for k, v := range pod.Annotations {
|
|
copyPod.Annotations[k] = v
|
|
}
|
|
hash := getPodHash(pod)
|
|
copyPod.Annotations[kubetypes.ConfigMirrorAnnotationKey] = hash
|
|
apiPod, err := mc.apiserverClient.CoreV1().Pods(copyPod.Namespace).Create(©Pod)
|
|
if err != nil && errors.IsAlreadyExists(err) {
|
|
// Check if the existing pod is the same as the pod we want to create.
|
|
if h, ok := apiPod.Annotations[kubetypes.ConfigMirrorAnnotationKey]; ok && h == hash {
|
|
return nil
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
|
|
// DeleteMirrorPod deletes a mirror pod.
|
|
// It takes the full name of the pod and optionally a UID. If the UID
|
|
// is non-nil, the pod is deleted only if its UID matches the supplied UID.
|
|
// It returns whether the pod was actually deleted, and any error returned
|
|
// while parsing the name of the pod.
|
|
// Non-existence of the pod or UID mismatch is not treated as an error; the
|
|
// routine simply returns false in that case.
|
|
func (mc *basicMirrorClient) DeleteMirrorPod(podFullName string, uid *types.UID) (bool, error) {
|
|
if mc.apiserverClient == nil {
|
|
return false, nil
|
|
}
|
|
name, namespace, err := kubecontainer.ParsePodFullName(podFullName)
|
|
if err != nil {
|
|
klog.Errorf("Failed to parse a pod full name %q", podFullName)
|
|
return false, err
|
|
}
|
|
klog.V(2).Infof("Deleting a mirror pod %q (uid %#v)", podFullName, uid)
|
|
var GracePeriodSeconds int64
|
|
if err := mc.apiserverClient.CoreV1().Pods(namespace).Delete(name, &metav1.DeleteOptions{GracePeriodSeconds: &GracePeriodSeconds, Preconditions: &metav1.Preconditions{UID: uid}}); err != nil {
|
|
// Unfortunately, there's no generic error for failing a precondition
|
|
if !(errors.IsNotFound(err) || errors.IsConflict(err)) {
|
|
// We should return the error here, but historically this routine does
|
|
// not return an error unless it can't parse the pod name
|
|
klog.Errorf("Failed deleting a mirror pod %q: %v", podFullName, err)
|
|
}
|
|
return false, nil
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
// IsStaticPod returns true if the passed Pod is static.
|
|
func IsStaticPod(pod *v1.Pod) bool {
|
|
source, err := kubetypes.GetPodSource(pod)
|
|
return err == nil && source != kubetypes.ApiserverSource
|
|
}
|
|
|
|
// IsMirrorPod returns true if the passed Pod is a Mirror Pod.
|
|
func IsMirrorPod(pod *v1.Pod) bool {
|
|
_, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]
|
|
return ok
|
|
}
|
|
|
|
func getHashFromMirrorPod(pod *v1.Pod) (string, bool) {
|
|
hash, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]
|
|
return hash, ok
|
|
}
|
|
|
|
func getPodHash(pod *v1.Pod) string {
|
|
// The annotation exists for all static pods.
|
|
return pod.Annotations[kubetypes.ConfigHashAnnotationKey]
|
|
}
|