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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
| package main
import (
"flag"
"fmt"
"os"
"time"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/fields"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
)
type Controller struct {
lister cache.Indexer
controller cache.Controller
queue workqueue.RateLimitingInterface
}
func NewController(lister cache.Indexer, controller cache.Controller, queue workqueue.RateLimitingInterface) *Controller {
return &Controller{
lister: lister,
controller: controller,
queue: queue,
}
}
func (c *Controller) processItem() bool {
item, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(item)
fmt.Println(item)
err := c.processWrapper(item.(string))
if err != nil {
c.handleError(item.(string))
}
return true
}
func (c *Controller) handleError(key string) {
if c.queue.NumRequeues(key) < 3 {
c.queue.AddRateLimited(key)
return
}
c.queue.Forget(key)
klog.Infof("Drop Object %s in queue", key)
}
func (c *Controller) processWrapper(key string) error {
item, exists, err := c.lister.GetByKey(key)
if err != nil {
klog.Error(err)
return err
}
if !exists {
klog.Info(fmt.Sprintf("item %v not exists in cache.\n", item))
} else {
fmt.Println(item.(*v1.Pod).GetName())
}
return err
}
func (c *Controller) Run(threadiness int, stopCh chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
klog.Infof("Starting custom controller")
go c.controller.Run(stopCh)
if !cache.WaitForCacheSync(stopCh, c.controller.HasSynced) {
utilruntime.HandleError(fmt.Errorf("sync failed."))
return
}
for i := 0; i < threadiness; i++ {
go wait.Until(func() {
for c.processItem() {
}
}, time.Second, stopCh)
}
<-stopCh
klog.Info("Stopping custom controller")
}
func main() {
var (
k8sconfig *string //使用kubeconfig配置文件进行集群权限认证
restConfig *rest.Config
err error
)
if home := homedir.HomeDir(); home != "" {
k8sconfig = flag.String("kubeconfig", fmt.Sprintf("%s/.kube/config", home), "kubernetes auth config")
}
k8sconfig = k8sconfig
flag.Parse()
if _, err := os.Stat(*k8sconfig); err != nil {
panic(err)
}
if restConfig, err = rest.InClusterConfig(); err != nil {
// 这里是从masterUrl 或者 kubeconfig传入集群的信息，两者选一
restConfig, err = clientcmd.BuildConfigFromFlags("", *k8sconfig)
if err != nil {
panic(err)
}
}
restset, err := kubernetes.NewForConfig(restConfig)
lister := cache.NewListWatchFromClient(restset.CoreV1().RESTClient(), "pods", "default", fields.Everything())
queue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
indexer, controller := cache.NewIndexerInformer(lister, &v1.Pod{}, 0, cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
fmt.Println("add ", obj.(*v1.Pod).GetName())
key, err := cache.MetaNamespaceKeyFunc(obj)
if err == nil {
queue.Add(key)
}
},
UpdateFunc: func(oldObj, newObj interface{}) {
fmt.Println("update", newObj.(*v1.Pod).GetName())
if newObj.(*v1.Pod).Status.Conditions[0].Status == "True" {
fmt.Println("update: the Initialized Status", newObj.(*v1.Pod).Status.Conditions[0].Status)
} else {
fmt.Println("update: the Initialized Status ", newObj.(*v1.Pod).Status.Conditions[0].Status)
fmt.Println("update: the Initialized Reason ", newObj.(*v1.Pod).Status.Conditions[0].Reason)
}
if len(newObj.(*v1.Pod).Status.Conditions) > 1 {
if newObj.(*v1.Pod).Status.Conditions[1].Status == "True" {
fmt.Println("update: the Ready Status", newObj.(*v1.Pod).Status.Conditions[1].Status)
} else {
fmt.Println("update: the Ready Status ", newObj.(*v1.Pod).Status.Conditions[1].Status)
fmt.Println("update: the Ready Reason ", newObj.(*v1.Pod).Status.Conditions[1].Reason)
}
if newObj.(*v1.Pod).Status.Conditions[2].Status == "True" {
fmt.Println("update: the PodCondition Status", newObj.(*v1.Pod).Status.Conditions[2].Status)
} else {
fmt.Println("update: the PodCondition Status ", newObj.(*v1.Pod).Status.Conditions[2].Status)
fmt.Println("update: the PodCondition Reason ", newObj.(*v1.Pod).Status.Conditions[2].Reason)
}
if newObj.(*v1.Pod).Status.Conditions[3].Status == "True" {
fmt.Println("update: the PodScheduled Status", newObj.(*v1.Pod).Status.Conditions[3].Status)
} else {
fmt.Println("update: the PodScheduled Status ", newObj.(*v1.Pod).Status.Conditions[3].Status)
fmt.Println("update: the PodScheduled Reason ", newObj.(*v1.Pod).Status.Conditions[3].Reason)
}
}
},
DeleteFunc: func(obj interface{}) {
fmt.Println("delete ", obj.(*v1.Pod).GetName(), "Status ", obj.(*v1.Pod).Status.Phase)
// 上面是事件函数的处理，下面是对workqueue的操作
key, err := cache.MetaNamespaceKeyFunc(obj)
if err == nil {
queue.Add(key)
}
},
}, cache.Indexers{})
c := NewController(indexer, controller, queue)
stopCh := make(chan struct{})
stopCh1 := make(chan struct{})
c.Run(1, stopCh)
defer close(stopCh)
<-stopCh1
}
|