/
kctl.go
137 lines (112 loc) · 3.12 KB
/
kctl.go
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package kctl
import (
"fmt"
"os"
"time"
ac "k8s.io/api/core/v1"
am "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
tc "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
)
type Controller struct {
Handler ControllerHandler
Identifier string
Name string
Namespace string
errch chan error
recorder record.EventRecorder
}
type ControllerHandler interface {
Add(interface{}) error
Client() kubernetes.Interface
Delete(interface{}) error
Start() error
Stop() error
Update(interface{}, interface{}) error
}
func NewController(namespace, name string, handler ControllerHandler) (*Controller, error) {
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
c := &Controller{
Handler: handler,
Identifier: hostname,
Name: name,
Namespace: namespace,
}
return c, nil
}
func (c *Controller) Event(object runtime.Object, eventtype, reason, message string) {
c.recorder.Event(object, eventtype, reason, message)
}
func (c *Controller) Run(informer cache.SharedInformer, ch chan error) {
c.errch = ch
eb := record.NewBroadcaster()
eb.StartRecordingToSink(&tc.EventSinkImpl{Interface: c.Handler.Client().CoreV1().Events("")})
c.recorder = eb.NewRecorder(scheme.Scheme, ac.EventSource{Component: c.Name})
rl := &resourcelock.ConfigMapLock{
ConfigMapMeta: am.ObjectMeta{Namespace: c.Namespace, Name: c.Name},
Client: c.Handler.Client().CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: c.Identifier,
EventRecorder: c.recorder,
},
}
el, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
Lock: rl,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 2 * time.Second,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: c.leaderStart(informer),
},
})
if err != nil {
ch <- err
return
}
go el.Run()
}
func (c *Controller) leaderStart(informer cache.SharedInformer) func(<-chan struct{}) {
return func(stop <-chan struct{}) {
fmt.Printf("started leading: %s/%s (%s)\n", c.Namespace, c.Name, c.Identifier)
informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addHandler,
DeleteFunc: c.deleteHandler,
UpdateFunc: c.updateHandler,
})
if err := c.Handler.Start(); err != nil {
c.errch <- err
}
informer.Run(stop)
fmt.Printf("stopped leading: %s/%s (%s)\n", c.Namespace, c.Name, c.Identifier)
if err := c.Handler.Stop(); err != nil {
c.errch <- err
}
}
}
func (c *Controller) addHandler(obj interface{}) {
if err := c.Handler.Add(obj); err != nil {
c.errch <- err
}
}
func (c *Controller) deleteHandler(obj interface{}) {
if err := c.Handler.Delete(obj); err != nil {
c.errch <- err
}
}
func (c *Controller) updateHandler(prev, cur interface{}) {
// if reflect.DeepEqual(prev, cur) {
// return
// }
if err := c.Handler.Update(prev, cur); err != nil {
c.errch <- err
}
}