136 lines
4.1 KiB
Go
136 lines
4.1 KiB
Go
/*
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Copyright 2016 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 kubectl
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import (
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"bytes"
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"fmt"
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"io"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/apis/extensions"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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deploymentutil "k8s.io/kubernetes/pkg/controller/deployment/util"
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sliceutil "k8s.io/kubernetes/pkg/util/slice"
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)
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const (
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ChangeCauseAnnotation = "kubernetes.io/change-cause"
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)
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// HistoryViewer provides an interface for resources have historical information.
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type HistoryViewer interface {
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ViewHistory(namespace, name string, revision int64) (string, error)
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}
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func HistoryViewerFor(kind schema.GroupKind, c clientset.Interface) (HistoryViewer, error) {
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switch kind {
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case extensions.Kind("Deployment"):
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return &DeploymentHistoryViewer{c}, nil
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}
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return nil, fmt.Errorf("no history viewer has been implemented for %q", kind)
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}
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type DeploymentHistoryViewer struct {
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c clientset.Interface
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}
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// ViewHistory returns a revision-to-replicaset map as the revision history of a deployment
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func (h *DeploymentHistoryViewer) ViewHistory(namespace, name string, revision int64) (string, error) {
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versionedClient := versionedClientsetForDeployment(h.c)
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deployment, err := versionedClient.Extensions().Deployments(namespace).Get(name, metav1.GetOptions{})
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if err != nil {
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return "", fmt.Errorf("failed to retrieve deployment %s: %v", name, err)
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}
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_, allOldRSs, newRS, err := deploymentutil.GetAllReplicaSets(deployment, versionedClient)
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if err != nil {
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return "", fmt.Errorf("failed to retrieve replica sets from deployment %s: %v", name, err)
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}
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allRSs := allOldRSs
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if newRS != nil {
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allRSs = append(allRSs, newRS)
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}
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historyInfo := make(map[int64]*v1.PodTemplateSpec)
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for _, rs := range allRSs {
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v, err := deploymentutil.Revision(rs)
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if err != nil {
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continue
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}
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historyInfo[v] = &rs.Spec.Template
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changeCause := getChangeCause(rs)
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if historyInfo[v].Annotations == nil {
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historyInfo[v].Annotations = make(map[string]string)
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}
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if len(changeCause) > 0 {
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historyInfo[v].Annotations[ChangeCauseAnnotation] = changeCause
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}
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}
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if len(historyInfo) == 0 {
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return "No rollout history found.", nil
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}
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if revision > 0 {
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// Print details of a specific revision
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template, ok := historyInfo[revision]
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if !ok {
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return "", fmt.Errorf("unable to find the specified revision")
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}
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buf := bytes.NewBuffer([]byte{})
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internalTemplate := &api.PodTemplateSpec{}
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if err := v1.Convert_v1_PodTemplateSpec_To_api_PodTemplateSpec(template, internalTemplate, nil); err != nil {
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return "", fmt.Errorf("failed to convert podtemplate, %v", err)
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}
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DescribePodTemplate(internalTemplate, buf)
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return buf.String(), nil
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}
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// Sort the revisionToChangeCause map by revision
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revisions := make([]int64, 0, len(historyInfo))
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for r := range historyInfo {
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revisions = append(revisions, r)
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}
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sliceutil.SortInts64(revisions)
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return tabbedString(func(out io.Writer) error {
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fmt.Fprintf(out, "REVISION\tCHANGE-CAUSE\n")
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for _, r := range revisions {
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// Find the change-cause of revision r
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changeCause := historyInfo[r].Annotations[ChangeCauseAnnotation]
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if len(changeCause) == 0 {
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changeCause = "<none>"
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}
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fmt.Fprintf(out, "%d\t%s\n", r, changeCause)
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}
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return nil
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})
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}
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// getChangeCause returns the change-cause annotation of the input object
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func getChangeCause(obj runtime.Object) string {
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accessor, err := meta.Accessor(obj)
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if err != nil {
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return ""
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}
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return accessor.GetAnnotations()[ChangeCauseAnnotation]
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}
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