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controller.go
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controller.go
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package event
import (
"time"
"github.com/golang/glog"
"github.com/nirmata/kyverno/pkg/client/clientset/versioned/scheme"
kyvernoinformer "github.com/nirmata/kyverno/pkg/client/informers/externalversions/kyverno/v1"
kyvernolister "github.com/nirmata/kyverno/pkg/client/listers/kyverno/v1"
client "github.com/nirmata/kyverno/pkg/dclient"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
)
//Generator generate events
type Generator struct {
client *client.Client
pLister kyvernolister.ClusterPolicyLister
queue workqueue.RateLimitingInterface
recorder record.EventRecorder
}
//Interface to generate event
type Interface interface {
Add(infoList ...Info)
}
//NewEventGenerator to generate a new event controller
func NewEventGenerator(client *client.Client, pInformer kyvernoinformer.ClusterPolicyInformer) *Generator {
gen := Generator{
client: client,
pLister: pInformer.Lister(),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), eventWorkQueueName),
recorder: initRecorder(client),
}
return &gen
}
func initRecorder(client *client.Client) record.EventRecorder {
// Initliaze Event Broadcaster
err := scheme.AddToScheme(scheme.Scheme)
if err != nil {
glog.Error(err)
return nil
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.V(4).Infof)
eventInterface, err := client.GetEventsInterface()
if err != nil {
glog.Error(err) // TODO: add more specific error
return nil
}
eventBroadcaster.StartRecordingToSink(
&typedcorev1.EventSinkImpl{
Interface: eventInterface})
recorder := eventBroadcaster.NewRecorder(
scheme.Scheme,
v1.EventSource{Component: eventSource})
return recorder
}
//Add queues an event for generation
func (gen *Generator) Add(infos ...Info) {
for _, info := range infos {
if info.Name == "" {
// dont create event for resources with generateName
// as the name is not generated yet
glog.V(4).Infof("recieved info %v, not creating an event as the resource has not been assigned a name yet", info)
continue
}
gen.queue.Add(info)
}
}
// Run begins generator
func (gen *Generator) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
glog.Info("Starting event generator")
defer glog.Info("Shutting down event generator")
for i := 0; i < workers; i++ {
go wait.Until(gen.runWorker, time.Second, stopCh)
}
<-stopCh
}
func (gen *Generator) runWorker() {
for gen.processNextWorkItem() {
}
}
func (gen *Generator) handleErr(err error, key interface{}) {
if err == nil {
gen.queue.Forget(key)
return
}
// This controller retries if something goes wrong. After that, it stops trying.
if gen.queue.NumRequeues(key) < workQueueRetryLimit {
glog.Warningf("Error syncing events %v: %v", key, err)
// Re-enqueue the key rate limited. Based on the rate limiter on the
// queue and the re-enqueue history, the key will be processed later again.
gen.queue.AddRateLimited(key)
return
}
gen.queue.Forget(key)
glog.Error(err)
glog.Warningf("Dropping the key out of the queue: %v", err)
}
func (gen *Generator) processNextWorkItem() bool {
obj, shutdown := gen.queue.Get()
if shutdown {
return false
}
err := func(obj interface{}) error {
defer gen.queue.Done(obj)
var key Info
var ok bool
if key, ok = obj.(Info); !ok {
gen.queue.Forget(obj)
glog.Warningf("Expecting type info by got %v\n", obj)
return nil
}
err := gen.syncHandler(key)
gen.handleErr(err, obj)
return nil
}(obj)
if err != nil {
glog.Error(err)
return true
}
return true
}
func (gen *Generator) syncHandler(key Info) error {
var robj runtime.Object
var err error
switch key.Kind {
case "ClusterPolicy":
//TODO: policy is clustered resource so wont need namespace
robj, err = gen.pLister.Get(key.Name)
if err != nil {
glog.Errorf("Error creating event: unable to get policy %s, will retry ", key.Name)
return err
}
default:
robj, err = gen.client.GetResource(key.Kind, key.Namespace, key.Name)
if err != nil {
glog.Errorf("Error creating event: unable to get resource %s, %s, will retry ", key.Kind, key.Namespace+"/"+key.Name)
return err
}
}
if key.Reason == PolicyApplied.String() {
gen.recorder.Event(robj, v1.EventTypeNormal, key.Reason, key.Message)
} else {
gen.recorder.Event(robj, v1.EventTypeWarning, key.Reason, key.Message)
}
return nil
}
//TODO: check if we need this ?
//NewEvent returns a new event
func NewEvent(rkind string, rnamespace string, rname string, reason Reason, message MsgKey, args ...interface{}) *Info {
msgText, err := getEventMsg(message, args...)
if err != nil {
glog.Error(err)
}
return &Info{
Kind: rkind,
Name: rname,
Namespace: rnamespace,
Reason: reason.String(),
Message: msgText,
}
}
func NewEventNew(
rkind,
rapiVersion,
rnamespace,
rname,
reason string,
message MsgKey,
args ...interface{}) Info {
msgText, err := getEventMsg(message, args...)
if err != nil {
glog.Error(err)
}
return Info{
Kind: rkind,
Name: rname,
Namespace: rnamespace,
Reason: reason,
Message: msgText,
}
}