ad33c5c087
ChangeCauseAnnotation is hardcoded in PrintRolloutHistory and it needs to be overriden since other resources that may need to be added in `kubectl rollout history` may not use it. Instead of adding one more method in the factory, refactor the existing HistoryViewer interface to accomodate the change.
130 lines
3.7 KiB
Go
130 lines
3.7 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/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/meta"
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"k8s.io/kubernetes/pkg/api/unversioned"
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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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"k8s.io/kubernetes/pkg/runtime"
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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 unversioned.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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deployment, err := h.c.Extensions().Deployments(namespace).Get(name)
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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, h.c)
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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]*api.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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DescribePodTemplate(template, 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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