-
Notifications
You must be signed in to change notification settings - Fork 0
/
controller.go
87 lines (69 loc) · 1.88 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
package main
import (
"fmt"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type Controller struct {
Queue workqueue.RateLimitingInterface
Informer cache.SharedInformer
Options controllerOptions
}
type controllerOptions struct {
PodFilter string
}
func NewController(
queue workqueue.RateLimitingInterface,
informer cache.SharedInformer,
options controllerOptions,
) *Controller {
return &Controller{
Queue: queue,
Informer: informer,
Options: options,
}
}
// entry point for the controller
func (controller *Controller) Run(stopCh chan struct{}) {
defer runtime.HandleCrash()
defer controller.Queue.ShutDown()
fmt.Println("starting controller")
fmt.Printf("filtering for pods with the label 'k8s-pod-logger=%s'\n", controller.Options.PodFilter)
// start listening for changes on the provided listener
go controller.Informer.Run(stopCh)
if !cache.WaitForCacheSync(stopCh, controller.Informer.HasSynced) {
fmt.Println("Timeout waiting for cache to sync.")
return
}
go controller.runWorker()
<-stopCh
fmt.Println("stopping controller")
}
func (controller *Controller) runWorker() {
for controller.processNextWorkItem() {
}
}
func (controller *Controller) processNextWorkItem() bool {
// block until an item is returned, or queue tells us to shutdown
obj, shutdown := controller.Queue.Get()
if shutdown {
return false
}
err := func(obj interface{}) error {
defer controller.Queue.Done(obj)
logEvent, ok := obj.(LogEvent)
if !ok {
// requeue failed items with provided backoff strategy
controller.Queue.AddRateLimited(obj)
return fmt.Errorf("error processing %q: requeuing", logEvent.ResourceName)
}
fmt.Printf("[%s] %s\n", logEvent.Action, logEvent.ResourceName)
controller.Queue.Forget(obj)
return nil
}(obj)
if err != nil {
runtime.HandleError(err)
}
return true
}