115 lines
2.5 KiB
Go
115 lines
2.5 KiB
Go
|
package k8s
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/traefik/traefik/v2/pkg/log"
|
||
|
|
corev1 "k8s.io/api/core/v1"
|
||
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ResourceEventHandler handles Add, Update or Delete Events for resources.
|
||
|
|
type ResourceEventHandler struct {
|
||
|
|
Ev chan<- interface{}
|
||
|
|
}
|
||
|
|
|
||
|
|
// OnAdd is called on Add Events.
|
||
|
|
func (reh *ResourceEventHandler) OnAdd(obj interface{}) {
|
||
|
|
eventHandlerFunc(reh.Ev, obj)
|
||
|
|
}
|
||
|
|
|
||
|
|
// OnUpdate is called on Update Events.
|
||
|
|
// Ignores useless changes.
|
||
|
|
func (reh *ResourceEventHandler) OnUpdate(oldObj, newObj interface{}) {
|
||
|
|
if objChanged(oldObj, newObj) {
|
||
|
|
eventHandlerFunc(reh.Ev, newObj)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// OnDelete is called on Delete Events.
|
||
|
|
func (reh *ResourceEventHandler) OnDelete(obj interface{}) {
|
||
|
|
eventHandlerFunc(reh.Ev, obj)
|
||
|
|
}
|
||
|
|
|
||
|
|
// eventHandlerFunc will pass the obj on to the events channel or drop it.
|
||
|
|
// This is so passing the events along won't block in the case of high volume.
|
||
|
|
// The events are only used for signaling anyway so dropping a few is ok.
|
||
|
|
func eventHandlerFunc(events chan<- interface{}, obj interface{}) {
|
||
|
|
select {
|
||
|
|
case events <- obj:
|
||
|
|
default:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func objChanged(oldObj, newObj interface{}) bool {
|
||
|
|
if oldObj == nil || newObj == nil {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
if oldObj.(metav1.Object).GetResourceVersion() == newObj.(metav1.Object).GetResourceVersion() {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if _, ok := oldObj.(*corev1.Endpoints); ok {
|
||
|
|
if endpointsChanged(oldObj.(*corev1.Endpoints), newObj.(*corev1.Endpoints)) {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
log.WithoutContext().Debugf("endpoint %s has no changes, ignoring", newObj.(*corev1.Endpoints).Name)
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func endpointsChanged(a, b *corev1.Endpoints) bool {
|
||
|
|
if len(a.Subsets) != len(b.Subsets) {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
for i, sa := range a.Subsets {
|
||
|
|
sb := b.Subsets[i]
|
||
|
|
if subsetsChanged(sa, sb) {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
func subsetsChanged(sa, sb corev1.EndpointSubset) bool {
|
||
|
|
if len(sa.Addresses) != len(sb.Addresses) {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(sa.Ports) != len(sb.Ports) {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
// in Addresses and Ports, we should be able to rely on
|
||
|
|
// these being sorted and able to be compared
|
||
|
|
// they are supposed to be in a canonical format
|
||
|
|
for addr, aaddr := range sa.Addresses {
|
||
|
|
baddr := sb.Addresses[addr]
|
||
|
|
if aaddr.IP != baddr.IP {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
if aaddr.Hostname != baddr.Hostname {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for port, aport := range sa.Ports {
|
||
|
|
bport := sb.Ports[port]
|
||
|
|
if aport.Name != bport.Name {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
if aport.Port != bport.Port {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
if aport.Protocol != bport.Protocol {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false
|
||
|
|
}
|