/
informers.go
135 lines (105 loc) · 3.9 KB
/
informers.go
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package v1helpers
import (
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
corev1listers "k8s.io/client-go/listers/core/v1"
)
// KubeInformersForNamespaces is a simple way to combine several shared informers into a single struct with unified listing power
type KubeInformersForNamespaces interface {
Start(stopCh <-chan struct{})
InformersFor(namespace string) informers.SharedInformerFactory
Namespaces() sets.Set[string]
ConfigMapLister() corev1listers.ConfigMapLister
SecretLister() corev1listers.SecretLister
// Used in by workloads controller and controllers that report deployment pods status
PodLister() corev1listers.PodLister
}
var _ KubeInformersForNamespaces = kubeInformersForNamespaces{}
func NewKubeInformersForNamespaces(kubeClient kubernetes.Interface, namespaces ...string) KubeInformersForNamespaces {
ret := kubeInformersForNamespaces{}
for _, namespace := range namespaces {
if len(namespace) == 0 {
ret[""] = informers.NewSharedInformerFactory(kubeClient, 10*time.Minute)
continue
}
ret[namespace] = informers.NewSharedInformerFactoryWithOptions(kubeClient, 10*time.Minute, informers.WithNamespace(namespace))
}
return ret
}
type kubeInformersForNamespaces map[string]informers.SharedInformerFactory
func (i kubeInformersForNamespaces) Start(stopCh <-chan struct{}) {
for _, informer := range i {
informer.Start(stopCh)
}
}
func (i kubeInformersForNamespaces) Namespaces() sets.Set[string] {
return sets.KeySet(i)
}
func (i kubeInformersForNamespaces) InformersFor(namespace string) informers.SharedInformerFactory {
return i[namespace]
}
func (i kubeInformersForNamespaces) HasInformersFor(namespace string) bool {
return i.InformersFor(namespace) != nil
}
type configMapLister kubeInformersForNamespaces
func (i kubeInformersForNamespaces) ConfigMapLister() corev1listers.ConfigMapLister {
return configMapLister(i)
}
func (l configMapLister) List(selector labels.Selector) (ret []*corev1.ConfigMap, err error) {
globalInformer, ok := l[""]
if !ok {
return nil, fmt.Errorf("combinedLister does not support cross namespace list")
}
return globalInformer.Core().V1().ConfigMaps().Lister().List(selector)
}
func (l configMapLister) ConfigMaps(namespace string) corev1listers.ConfigMapNamespaceLister {
informer, ok := l[namespace]
if !ok {
// coding error
panic(fmt.Sprintf("namespace %q is missing", namespace))
}
return informer.Core().V1().ConfigMaps().Lister().ConfigMaps(namespace)
}
type secretLister kubeInformersForNamespaces
func (i kubeInformersForNamespaces) SecretLister() corev1listers.SecretLister {
return secretLister(i)
}
func (l secretLister) List(selector labels.Selector) (ret []*corev1.Secret, err error) {
globalInformer, ok := l[""]
if !ok {
return nil, fmt.Errorf("combinedLister does not support cross namespace list")
}
return globalInformer.Core().V1().Secrets().Lister().List(selector)
}
func (l secretLister) Secrets(namespace string) corev1listers.SecretNamespaceLister {
informer, ok := l[namespace]
if !ok {
// coding error
panic(fmt.Sprintf("namespace %q is missing", namespace))
}
return informer.Core().V1().Secrets().Lister().Secrets(namespace)
}
type podLister kubeInformersForNamespaces
func (i kubeInformersForNamespaces) PodLister() corev1listers.PodLister {
return podLister(i)
}
func (l podLister) List(selector labels.Selector) (ret []*corev1.Pod, err error) {
globalInformer, ok := l[""]
if !ok {
return nil, fmt.Errorf("combinedLister does not support cross namespace list")
}
return globalInformer.Core().V1().Pods().Lister().List(selector)
}
func (l podLister) Pods(namespace string) corev1listers.PodNamespaceLister {
informer, ok := l[namespace]
if !ok {
// coding error
panic(fmt.Sprintf("namespace %q is missing", namespace))
}
return informer.Core().V1().Pods().Lister().Pods(namespace)
}