/
controller.go
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/
controller.go
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package controller
import (
"context"
"fmt"
"runtime/debug"
"time"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
app_listers "k8s.io/client-go/listers/apps/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
foo_clientset "github.com/vietanhduong/xcontroller/pkg/client/clientset/versioned"
foo_scheme "github.com/vietanhduong/xcontroller/pkg/client/clientset/versioned/scheme"
foo_informers "github.com/vietanhduong/xcontroller/pkg/client/informers/externalversions"
foo_listers "github.com/vietanhduong/xcontroller/pkg/client/listers/foo/v1alpha1"
"github.com/vietanhduong/xcontroller/pkg/util/log"
"github.com/vietanhduong/xcontroller/pkg/apis/foo/v1alpha1"
)
type Controller struct {
ctx context.Context
fooClient foo_clientset.Interface
kubeClient kubernetes.Interface
queue workqueue.RateLimitingInterface
barInformer cache.SharedIndexInformer
barLister foo_listers.BarLister
deployInformer cache.SharedIndexInformer
deployLister app_listers.DeploymentLister
recorder record.EventRecorder
}
func NewController(ctx context.Context, fooClient foo_clientset.Interface, kubeClient kubernetes.Interface, recorder record.EventRecorder) *Controller {
utilruntime.Must(foo_scheme.AddToScheme(scheme.Scheme))
log.Info("Creating event broadcaster...")
fooInformerFactory := foo_informers.NewSharedInformerFactory(fooClient, time.Hour)
kubeInformerFactory := kubeinformers.NewSharedInformerFactory(kubeClient, time.Hour)
barInformer := fooInformerFactory.Foo().V1alpha1().Bars()
deployInformer := kubeInformerFactory.Apps().V1().Deployments()
controller := &Controller{
ctx: ctx,
fooClient: fooClient,
kubeClient: kubeClient,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Bar_queue"),
barInformer: barInformer.Informer(),
barLister: barInformer.Lister(),
deployInformer: deployInformer.Informer(),
deployLister: deployInformer.Lister(),
recorder: recorder,
}
controller.barInformer.AddEventHandler(addFooResourceHandlerFunc(controller.queue))
controller.deployInformer.AddEventHandler(controller.addK8sResourceHandlerFunc())
fooInformerFactory.Start(ctx.Done())
kubeInformerFactory.Start(ctx.Done())
return controller
}
func (c *Controller) Run(worker int) error {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
if ok := cache.WaitForCacheSync(c.ctx.Done(), c.barInformer.HasSynced, c.deployInformer.HasSynced); !ok {
return fmt.Errorf("failed to wait for caches to sync")
}
for i := 0; i < worker; i++ {
go wait.Until(func() {
for c.processItemQueue() {
}
}, time.Second, c.ctx.Done())
}
<-c.ctx.Done()
return nil
}
func (c *Controller) processItemQueue() bool {
obj, quit := c.queue.Get()
if quit {
return false
}
err := func(obj interface{}) error {
defer func() {
if r := recover(); r != nil {
log.Errorf("controller/queue: recovered from panic: %+v\n%s", r, debug.Stack())
}
c.queue.Done(obj)
}()
var key string
var ok bool
if key, ok = obj.(string); !ok {
c.queue.Forget(obj)
log.Errorf("controller/queue: expected string in workqueue but got %#v", obj)
return nil
}
if err := c.processBar(key); err != nil {
c.queue.AddRateLimited(key)
return fmt.Errorf("controler/queue: error syncing '%s': %s, requeuing", key, err.Error())
}
c.queue.Forget(obj)
log.Infof("controller/queue: successfully synced '%s'", key)
return nil
}(obj)
if err != nil {
log.Errorf("process queue failed: %v", err)
}
return true
}
func (c *Controller) processBar(key string) error {
var namespace string
var name string
var b *v1alpha1.Bar
var err error
if namespace, name, err = cache.SplitMetaNamespaceKey(key); err != nil {
log.Errorf("invalid resource key: '%s'", key)
return nil
}
if b, err = c.barLister.Bars(namespace).Get(name); err != nil {
// Object already deleted
if errors.IsNotFound(err) {
return nil
}
return err
}
if err = c.reconcile(b); err != nil {
c.onReconcileFailed(b, err)
}
return err
}
func (c *Controller) addK8sResourceHandlerFunc() cache.ResourceEventHandlerFuncs {
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { c.handlerK8sObject(obj) },
UpdateFunc: func(oldObj, newObj interface{}) {
o1, ok1 := newObj.(metav1.Object)
o2, ok2 := oldObj.(metav1.Object)
if !ok1 || !ok2 {
log.Infof("Cast object to metav1.Object failed")
return
}
if o1.GetResourceVersion() != o2.GetResourceVersion() {
c.handlerK8sObject(newObj)
}
},
DeleteFunc: func(obj interface{}) {
c.handlerK8sObject(obj)
},
}
}
func (c *Controller) handlerK8sObject(obj interface{}) {
var object metav1.Object
var tombstone cache.DeletedFinalStateUnknown
var ok bool
if object, ok = obj.(metav1.Object); !ok {
if tombstone, ok = obj.(cache.DeletedFinalStateUnknown); !ok {
log.Errorf("error decoding object, invalid type")
return
}
if object, ok = tombstone.Obj.(metav1.Object); !ok {
log.Errorf("error decoding object tombstone, invalid type")
return
}
log.Infof("Recovered deleted object '%s' from tombstone", object.GetName())
}
var owner *metav1.OwnerReference
if owner = metav1.GetControllerOf(object); owner == nil {
return
}
if owner.Kind == "Bar" {
var key string
var b *v1alpha1.Bar
var err error
if b, err = c.barLister.Bars(object.GetNamespace()).Get(object.GetName()); err == nil {
if key, err = cache.MetaNamespaceKeyFunc(b); err == nil {
c.queue.Add(key)
return
}
log.Errorf("controller: parse metadata key failed: %v", err)
return
}
log.Errorf("controller: get Bar failed: %v", err)
}
}
func addFooResourceHandlerFunc(queue workqueue.RateLimitingInterface) cache.ResourceEventHandlerFuncs {
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if key, err := cache.MetaNamespaceKeyFunc(obj); err == nil {
queue.Add(key)
}
},
UpdateFunc: func(old, cur interface{}) {
if key, err := cache.MetaNamespaceKeyFunc(cur); err == nil {
queue.Add(key)
}
},
DeleteFunc: func(obj interface{}) {
if key, err := cache.MetaNamespaceKeyFunc(obj); err == nil {
queue.Add(key)
}
},
}
}