/
k8snamespace.go
100 lines (82 loc) · 2.12 KB
/
k8snamespace.go
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package k8snamespace
import (
"context"
"fmt"
"os"
"time"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
)
type NamespaceGetter interface {
Get(string) (*v1.Namespace, error)
}
type NamespaceCache struct {
indexer cache.Indexer
informer cache.Controller
}
func NewWatcher(ctx context.Context) (*NamespaceCache, error) {
var config *restclient.Config
var err error
// config, err := rest.InClusterConfig()
kubeconfig, found := os.LookupEnv("KUBECONFIG")
if found {
config, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
} else {
config, err = rest.InClusterConfig()
}
if err != nil {
return nil, err
}
client, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
source := cache.NewListWatchFromClient(client.CoreV1().RESTClient(), "namespaces", "", fields.Everything())
eventHandler := &cache.FilteringResourceEventHandler{
FilterFunc: func(obj interface{}) bool {
_, isNamespace := obj.(*v1.Namespace)
if !isNamespace {
return false
}
// TODO change filter to relevant ns annotation
return true
},
Handler: &namespaceLogger{},
}
// OnUpdate is called every resyncPeriod
indexer, informer := cache.NewIndexerInformer(source, &v1.Namespace{}, time.Minute, eventHandler, cache.Indexers{})
c := &NamespaceCache{
indexer: indexer,
informer: informer,
}
go c.informer.Run(ctx.Done())
ok := cache.WaitForCacheSync(ctx.Done(), c.informer.HasSynced)
if !ok {
return nil, fmt.Errorf("failed to sync cache")
}
return c, nil
}
// GetNamespace finds the Namespace by its name
func (c *NamespaceCache) Get(name string) (*v1.Namespace, error) {
obj, exists, err := c.indexer.GetByKey(name)
if err != nil {
return nil, err
}
if !exists {
return nil, nil
}
return obj.(*v1.Namespace), nil
}
type namespaceLogger struct {
}
func (o *namespaceLogger) OnAdd(obj interface{}) {
}
func (o *namespaceLogger) OnDelete(obj interface{}) {
}
func (o *namespaceLogger) OnUpdate(old, new interface{}) {
}