mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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114 lines
3.8 KiB
Go
114 lines
3.8 KiB
Go
/*
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Copyright 2015 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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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
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)
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// MirrorClient knows how to create/delete a mirror pod in the API server.
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type MirrorClient interface {
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// CreateMirrorPod creates a mirror pod in the API server for the given
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// pod or returns an error. The mirror pod will have the same annotations
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// as the given pod as well as an extra annotation containing the hash of
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// the static pod.
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CreateMirrorPod(pod *v1.Pod) error
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// DeleteMirrorPod deletes the mirror pod with the given full name from
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// the API server or returns an error.
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DeleteMirrorPod(podFullName string) error
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}
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// basicMirrorClient is a functional MirrorClient. Mirror pods are stored in
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// the kubelet directly because they need to be in sync with the internal
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// pods.
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type basicMirrorClient struct {
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apiserverClient clientset.Interface
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}
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// NewBasicMirrorClient returns a new MirrorClient.
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func NewBasicMirrorClient(apiserverClient clientset.Interface) MirrorClient {
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return &basicMirrorClient{apiserverClient: apiserverClient}
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}
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func (mc *basicMirrorClient) CreateMirrorPod(pod *v1.Pod) error {
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if mc.apiserverClient == nil {
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return nil
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}
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// Make a copy of the pod.
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copyPod := *pod
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copyPod.Annotations = make(map[string]string)
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for k, v := range pod.Annotations {
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copyPod.Annotations[k] = v
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}
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hash := getPodHash(pod)
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copyPod.Annotations[kubetypes.ConfigMirrorAnnotationKey] = hash
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apiPod, err := mc.apiserverClient.CoreV1().Pods(copyPod.Namespace).Create(©Pod)
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if err != nil && errors.IsAlreadyExists(err) {
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// Check if the existing pod is the same as the pod we want to create.
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if h, ok := apiPod.Annotations[kubetypes.ConfigMirrorAnnotationKey]; ok && h == hash {
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return nil
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}
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}
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return err
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}
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func (mc *basicMirrorClient) DeleteMirrorPod(podFullName string) error {
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if mc.apiserverClient == nil {
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return nil
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}
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name, namespace, err := kubecontainer.ParsePodFullName(podFullName)
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if err != nil {
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klog.Errorf("Failed to parse a pod full name %q", podFullName)
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return err
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}
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klog.V(2).Infof("Deleting a mirror pod %q", podFullName)
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// TODO(random-liu): Delete the mirror pod with uid precondition in mirror pod manager
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if err := mc.apiserverClient.CoreV1().Pods(namespace).Delete(name, metav1.NewDeleteOptions(0)); err != nil && !errors.IsNotFound(err) {
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klog.Errorf("Failed deleting a mirror pod %q: %v", podFullName, err)
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}
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return nil
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}
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// IsStaticPod returns true if the pod is a static pod.
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func IsStaticPod(pod *v1.Pod) bool {
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source, err := kubetypes.GetPodSource(pod)
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return err == nil && source != kubetypes.ApiserverSource
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}
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// IsMirrorPod returns true if the pod is a mirror pod.
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func IsMirrorPod(pod *v1.Pod) bool {
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_, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]
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return ok
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}
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func getHashFromMirrorPod(pod *v1.Pod) (string, bool) {
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hash, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]
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return hash, ok
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}
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func getPodHash(pod *v1.Pod) string {
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// The annotation exists for all static pods.
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return pod.Annotations[kubetypes.ConfigHashAnnotationKey]
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}
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