forked from ziwon/k8s-controller
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcontroller.go
153 lines (133 loc) · 4.21 KB
/
controller.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
package main
import (
"log"
apicorev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/runtime"
informercorev1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
listercorev1 "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
)
const (
secretSyncType = "k8s.ziwon.dev/secretsync"
secretSyncSourceNamespace = "secretsync"
)
var namespaceBlacklist = map[string]bool{
"kube-public": true,
"kube-system": true,
secretSyncSourceNamespace: true,
}
// K&SController defines an example controller struct for watching the changes with Secrets
type K8SController struct {
secretGetter corev1.SecretsGetter
secretLister listercorev1.SecretLister
secretListerSynced cache.InformerSynced
namespaceGetter corev1.NamespacesGetter
namespaceLister listercorev1.NamespaceLister
namespaceListerSynced cache.InformerSynced
}
// NewK8SController constructs a new instance of K8SController
func NewK8SController(client *kubernetes.Clientset,
secretInformer informercorev1.SecretInformer,
namespaceInformer informercorev1.NamespaceInformer) *K8SController {
c := &K8SController{
secretGetter: client.CoreV1(),
secretLister: secretInformer.Lister(),
secretListerSynced: secretInformer.Informer().HasSynced,
namespaceGetter: client.CoreV1(),
namespaceLister: namespaceInformer.Lister(),
namespaceListerSynced: namespaceInformer.Informer().HasSynced,
}
secretInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
c.onAdd(obj)
},
UpdateFunc: func(oldObj, newObj interface{}) {
c.onUpdate(oldObj, newObj)
},
DeleteFunc: func(obj interface{}) {
c.onDelete(obj)
},
},
)
return c
}
func (c *K8SController) Run(stop <-chan struct{}) {
log.Print("waiting for cache sync")
if !cache.WaitForCacheSync(stop, c.secretListerSynced) {
log.Print("timed out waiting for cache sync")
return
}
log.Print("caches are synced")
// wait until we're told to stop
log.Print("waiting for stop signal")
<-stop
log.Print("received stop signal")
}
func (c *K8SController) onAdd(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
log.Printf("onAdd: error getting key for: %#v: %v", obj, err)
runtime.HandleError(err)
}
log.Printf("onAdd: %v", key)
c.handleSecretChange(obj)
}
func (c *K8SController) onUpdate(oldObj, newObj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(oldObj)
if err != nil {
log.Printf("onUpdate: error getting key for %#v: %v", oldObj, err)
runtime.HandleError(err)
}
log.Printf("onUpdate: %v", key)
c.handleSecretChange(newObj)
}
func (c *K8SController) onDelete(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
runtime.HandleError(err)
}
log.Printf("onDelete: %v", key)
c.handleSecretChange(obj)
}
func (c *K8SController) handleSecretChange(obj interface{}) {
secret, ok := obj.(*apicorev1.Secret)
if !ok {
// TODO: this is probably a `DeletedFinalStateUnknown`. Figure out what
// to do.
return
}
if secret.ObjectMeta.Namespace != secretSyncSourceNamespace {
log.Printf("Skipping secret in wrong namespace")
return
}
if secret.Type != secretSyncType {
log.Printf("Skipping secret of wrong type")
return
}
log.Printf("Do something with this secret")
nsList, err := c.namespaceGetter.Namespaces().List(metav1.ListOptions{})
if err != nil {
log.Printf("Error listeing namespaces: %v", err)
return
}
for _, ns := range nsList.Items {
nsName := ns.ObjectMeta.Name
if _, ok := namespaceBlacklist[nsName]; ok {
log.Printf("Skipping namespace on blacklist: %v", nsName)
continue
}
log.Printf("We should copy %s to namespace %s", secret.ObjectMeta.Name, ns.ObjectMeta.Name)
c.copySecretToNamespace(secret, nsName)
}
}
func (c *K8SController) copySecretToNamespace(secret *apicorev1.Secret, nsName string) {
// TODO:
// 1. Make a deep copy of the secret
// 2. Remove things like object version that'll prevent us from writing
// 3. Write in new namespace
// 4. Do a create or update for the new object
}