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namespace_informer.go
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/
namespace_informer.go
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package kube_events_manager
// Namespace manager monitor namespaces for onKubernetesEvent config.
import (
"context"
"fmt"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
corev1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/tools/cache"
klient "github.com/flant/kube-client/client"
)
type NamespaceInformer interface {
WithContext(ctx context.Context)
WithKubeClient(client klient.Client)
CreateSharedInformer(addFn func(string), delFn func(string)) error
GetExistedObjects() map[string]bool
Start()
Stop()
PauseHandleEvents()
}
type namespaceInformer struct {
ctx context.Context
cancel context.CancelFunc
stopped bool
KubeClient klient.Client
Monitor *MonitorConfig
SharedInformer cache.SharedInformer
ExistedObjects map[string]bool
addFn func(string)
delFn func(string)
}
// namespaceInformer implements NamespaceInformer interface
var _ NamespaceInformer = &namespaceInformer{}
var NewNamespaceInformer = func(monitor *MonitorConfig) NamespaceInformer {
informer := &namespaceInformer{
Monitor: monitor,
ExistedObjects: make(map[string]bool),
}
return informer
}
func (ni *namespaceInformer) WithContext(ctx context.Context) {
ni.ctx, ni.cancel = context.WithCancel(ctx)
}
func (ni *namespaceInformer) WithKubeClient(client klient.Client) {
ni.KubeClient = client
}
func (ni *namespaceInformer) CreateSharedInformer(addFn func(string), delFn func(string)) error {
// define resyncPeriod for informer
resyncPeriod := RandomizedResyncPeriod()
// define indexers for informer
indexers := cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}
// define tweakListOptions for informer
formatSelector, err := FormatLabelSelector(ni.Monitor.NamespaceSelector.LabelSelector)
if err != nil {
return fmt.Errorf("format label selector '%s': %s", ni.Monitor.NamespaceSelector.LabelSelector.String(), err)
}
tweakListOptions := func(options *metav1.ListOptions) {
if formatSelector != "" {
options.LabelSelector = formatSelector
}
}
ni.SharedInformer = corev1.NewFilteredNamespaceInformer(ni.KubeClient, resyncPeriod, indexers, tweakListOptions)
ni.addFn = addFn
ni.delFn = delFn
ni.SharedInformer.AddEventHandler(ni) // SharedNamespaceInformerEventHandler(ni, addFn, delFn))
listOptions := metav1.ListOptions{}
tweakListOptions(&listOptions)
existedObjects, err := ni.KubeClient.CoreV1().Namespaces().List(context.TODO(), listOptions)
if err != nil {
log.Errorf("list existing namespaces: %v", err)
return err
}
for _, ns := range existedObjects.Items {
ni.ExistedObjects[ns.Name] = true
}
return nil
}
func (ni *namespaceInformer) GetExistedObjects() map[string]bool {
return ni.ExistedObjects
}
func (ni *namespaceInformer) OnAdd(obj interface{}) {
if ni.stopped {
return
}
nsObj := obj.(*v1.Namespace)
log.Debugf("NamespaceInformer: Added ns/%s", nsObj.Name)
if ni.addFn != nil {
ni.addFn(nsObj.Name)
}
}
func (ni *namespaceInformer) OnUpdate(_ interface{}, _ interface{}) {
// Modified event for namespace is ignored
}
func (ni *namespaceInformer) OnDelete(obj interface{}) {
if ni.stopped {
return
}
if staleObj, stale := obj.(cache.DeletedFinalStateUnknown); stale {
obj = staleObj.Obj
}
nsObj := obj.(*v1.Namespace)
log.Debugf("NamespaceInformer: Deleted ns/%s", nsObj.Name)
if ni.delFn != nil {
ni.delFn(nsObj.Name)
}
}
func (ni *namespaceInformer) Start() {
log.Debugf("%s: Run namespace informer", ni.Monitor.Metadata.DebugName)
if ni.SharedInformer == nil {
log.Errorf("%s: Possible BUG!!! Start called before CreateSharedInformer, ShredInformer is nil", ni.Monitor.Metadata.DebugName)
return
}
stopCh := make(chan struct{}, 1)
go func() {
<-ni.ctx.Done()
ni.stopped = true
close(stopCh)
}()
go ni.SharedInformer.Run(stopCh)
if err := wait.PollImmediateUntil(DefaultSyncTime, func() (bool, error) {
return ni.SharedInformer.HasSynced(), nil
}, stopCh); err != nil {
ni.Monitor.LogEntry.Errorf("%s: cache is not synced for informer", ni.Monitor.Metadata.DebugName)
}
log.Debugf("%s: informer is ready", ni.Monitor.Metadata.DebugName)
}
func (ni *namespaceInformer) Stop() {
if ni.cancel != nil {
ni.cancel()
}
ni.stopped = true
}
func (ni *namespaceInformer) PauseHandleEvents() {
ni.stopped = true
}