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controller.go
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controller.go
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package event
import (
"time"
"github.com/go-logr/logr"
"github.com/kyverno/kyverno/pkg/client/clientset/versioned/scheme"
kyvernoinformer "github.com/kyverno/kyverno/pkg/client/informers/externalversions/kyverno/v1"
kyvernolister "github.com/kyverno/kyverno/pkg/client/listers/kyverno/v1"
client "github.com/kyverno/kyverno/pkg/dclient"
v1 "k8s.io/api/core/v1"
errors "k8s.io/apimachinery/pkg/api/errors"
"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/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
)
//Generator generate events
type Generator struct {
client *client.Client
// list/get cluster policy
cpLister kyvernolister.ClusterPolicyLister
// returns true if the cluster policy store has been synced at least once
cpSynced cache.InformerSynced
// list/get policy
pLister kyvernolister.PolicyLister
// returns true if the policy store has been synced at least once
pSynced cache.InformerSynced
// queue to store event generation requests
queue workqueue.RateLimitingInterface
// events generated at policy controller
policyCtrRecorder record.EventRecorder
// events generated at admission control
admissionCtrRecorder record.EventRecorder
// events generated at namespaced policy controller to process 'generate' rule
genPolicyRecorder record.EventRecorder
log logr.Logger
}
//Interface to generate event
type Interface interface {
Add(infoList ...Info)
}
//NewEventGenerator to generate a new event controller
func NewEventGenerator(client *client.Client, cpInformer kyvernoinformer.ClusterPolicyInformer, pInformer kyvernoinformer.PolicyInformer, log logr.Logger) *Generator {
gen := Generator{
client: client,
cpLister: cpInformer.Lister(),
cpSynced: cpInformer.Informer().HasSynced,
pLister: pInformer.Lister(),
pSynced: pInformer.Informer().HasSynced,
queue: workqueue.NewNamedRateLimitingQueue(rateLimiter(), eventWorkQueueName),
policyCtrRecorder: initRecorder(client, PolicyController, log),
admissionCtrRecorder: initRecorder(client, AdmissionController, log),
genPolicyRecorder: initRecorder(client, GeneratePolicyController, log),
log: log,
}
return &gen
}
func rateLimiter() workqueue.RateLimiter {
return workqueue.DefaultItemBasedRateLimiter()
}
func initRecorder(client *client.Client, eventSource Source, log logr.Logger) record.EventRecorder {
// Initliaze Event Broadcaster
err := scheme.AddToScheme(scheme.Scheme)
if err != nil {
log.Error(err, "failed to add to scheme")
return nil
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.V(5).Infof)
eventInterface, err := client.GetEventsInterface()
if err != nil {
log.Error(err, "failed to get event interface for logging")
return nil
}
eventBroadcaster.StartRecordingToSink(
&typedcorev1.EventSinkImpl{
Interface: eventInterface})
recorder := eventBroadcaster.NewRecorder(
scheme.Scheme,
v1.EventSource{Component: eventSource.String()})
return recorder
}
//Add queues an event for generation
func (gen *Generator) Add(infos ...Info) {
logger := gen.log
for _, info := range infos {
if info.Name == "" {
// dont create event for resources with generateName
// as the name is not generated yet
logger.V(4).Info("not creating an event as the resource has not been assigned a name yet", "kind", info.Kind, "name", info.Name, "namespace", info.Namespace)
continue
}
gen.queue.Add(info)
}
}
// Run begins generator
func (gen *Generator) Run(workers int, stopCh <-chan struct{}) {
logger := gen.log
defer utilruntime.HandleCrash()
logger.Info("start")
defer logger.Info("shutting down")
if !cache.WaitForCacheSync(stopCh, gen.cpSynced, gen.pSynced) {
logger.Info("failed to sync informer cache")
}
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{}) {
logger := gen.log
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 {
logger.V(4).Info("retrying event generation", "key", key, "reason", err.Error())
// 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)
if !errors.IsNotFound(err) {
logger.Error(err, "failed to generate event", "key", key)
}
}
func (gen *Generator) processNextWorkItem() bool {
logger := gen.log
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)
logger.Info("Incorrect type; expected type 'info'", "obj", obj)
return nil
}
err := gen.syncHandler(key)
gen.handleErr(err, obj)
return nil
}(obj)
if err != nil {
logger.Error(err, "failed to process next work item")
return true
}
return true
}
func (gen *Generator) syncHandler(key Info) error {
logger := gen.log
var robj runtime.Object
var err error
switch key.Kind {
case "ClusterPolicy":
robj, err = gen.cpLister.Get(key.Name)
if err != nil {
logger.Error(err, "failed to get cluster policy", "name", key.Name)
return err
}
case "Policy":
robj, err = gen.pLister.Policies(key.Namespace).Get(key.Name)
if err != nil {
logger.Error(err, "failed to get policy", "name", key.Name)
return err
}
default:
robj, err = gen.client.GetResource("", key.Kind, key.Namespace, key.Name)
if err != nil {
if !errors.IsNotFound(err) {
logger.Error(err, "failed to get resource", "kind", key.Kind, "name", key.Name, "namespace", key.Namespace)
}
return err
}
}
// set the event type based on reason
eventType := v1.EventTypeWarning
if key.Reason == PolicyApplied.String() {
eventType = v1.EventTypeNormal
}
// based on the source of event generation, use different event recorders
switch key.Source {
case AdmissionController:
gen.admissionCtrRecorder.Event(robj, eventType, key.Reason, key.Message)
case PolicyController:
gen.policyCtrRecorder.Event(robj, eventType, key.Reason, key.Message)
case GeneratePolicyController:
gen.genPolicyRecorder.Event(robj, eventType, key.Reason, key.Message)
default:
logger.Info("info.source not defined for the request")
}
return nil
}
//NewEvent builds a event creation request
func NewEvent(
log logr.Logger,
rkind,
rapiVersion,
rnamespace,
rname,
reason string,
source Source,
message MsgKey,
args ...interface{}) Info {
msgText, err := getEventMsg(message, args...)
if err != nil {
log.Error(err, "failed to get event message")
}
return Info{
Kind: rkind,
Name: rname,
Namespace: rnamespace,
Reason: reason,
Source: source,
Message: msgText,
}
}