forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 1
/
history.go
157 lines (137 loc) · 4.69 KB
/
history.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
/*
Copyright 2016 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 kubectl
import (
"bytes"
"fmt"
"io"
"text/tabwriter"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/v1"
"k8s.io/kubernetes/pkg/apis/apps"
"k8s.io/kubernetes/pkg/apis/extensions"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
deploymentutil "k8s.io/kubernetes/pkg/controller/deployment/util"
printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
sliceutil "k8s.io/kubernetes/pkg/util/slice"
)
const (
ChangeCauseAnnotation = "kubernetes.io/change-cause"
)
// HistoryViewer provides an interface for resources have historical information.
type HistoryViewer interface {
ViewHistory(namespace, name string, revision int64) (string, error)
}
func HistoryViewerFor(kind schema.GroupKind, c clientset.Interface) (HistoryViewer, error) {
switch kind {
case extensions.Kind("Deployment"), apps.Kind("Deployment"):
return &DeploymentHistoryViewer{c}, nil
}
return nil, fmt.Errorf("no history viewer has been implemented for %q", kind)
}
type DeploymentHistoryViewer struct {
c clientset.Interface
}
// ViewHistory returns a revision-to-replicaset map as the revision history of a deployment
// TODO: this should be a describer
func (h *DeploymentHistoryViewer) ViewHistory(namespace, name string, revision int64) (string, error) {
versionedClient := versionedClientsetForDeployment(h.c)
deployment, err := versionedClient.Extensions().Deployments(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return "", fmt.Errorf("failed to retrieve deployment %s: %v", name, err)
}
_, allOldRSs, newRS, err := deploymentutil.GetAllReplicaSets(deployment, versionedClient)
if err != nil {
return "", fmt.Errorf("failed to retrieve replica sets from deployment %s: %v", name, err)
}
allRSs := allOldRSs
if newRS != nil {
allRSs = append(allRSs, newRS)
}
historyInfo := make(map[int64]*v1.PodTemplateSpec)
for _, rs := range allRSs {
v, err := deploymentutil.Revision(rs)
if err != nil {
continue
}
historyInfo[v] = &rs.Spec.Template
changeCause := getChangeCause(rs)
if historyInfo[v].Annotations == nil {
historyInfo[v].Annotations = make(map[string]string)
}
if len(changeCause) > 0 {
historyInfo[v].Annotations[ChangeCauseAnnotation] = changeCause
}
}
if len(historyInfo) == 0 {
return "No rollout history found.", nil
}
if revision > 0 {
// Print details of a specific revision
template, ok := historyInfo[revision]
if !ok {
return "", fmt.Errorf("unable to find the specified revision")
}
buf := bytes.NewBuffer([]byte{})
internalTemplate := &api.PodTemplateSpec{}
if err := v1.Convert_v1_PodTemplateSpec_To_api_PodTemplateSpec(template, internalTemplate, nil); err != nil {
return "", fmt.Errorf("failed to convert podtemplate, %v", err)
}
w := printersinternal.NewPrefixWriter(buf)
printersinternal.DescribePodTemplate(internalTemplate, w)
return buf.String(), nil
}
// Sort the revisionToChangeCause map by revision
revisions := make([]int64, 0, len(historyInfo))
for r := range historyInfo {
revisions = append(revisions, r)
}
sliceutil.SortInts64(revisions)
return tabbedString(func(out io.Writer) error {
fmt.Fprintf(out, "REVISION\tCHANGE-CAUSE\n")
for _, r := range revisions {
// Find the change-cause of revision r
changeCause := historyInfo[r].Annotations[ChangeCauseAnnotation]
if len(changeCause) == 0 {
changeCause = "<none>"
}
fmt.Fprintf(out, "%d\t%s\n", r, changeCause)
}
return nil
})
}
// TODO: copied here until this becomes a describer
func tabbedString(f func(io.Writer) error) (string, error) {
out := new(tabwriter.Writer)
buf := &bytes.Buffer{}
out.Init(buf, 0, 8, 1, '\t', 0)
err := f(out)
if err != nil {
return "", err
}
out.Flush()
str := string(buf.String())
return str, nil
}
// getChangeCause returns the change-cause annotation of the input object
func getChangeCause(obj runtime.Object) string {
accessor, err := meta.Accessor(obj)
if err != nil {
return ""
}
return accessor.GetAnnotations()[ChangeCauseAnnotation]
}