// Iterate through all pods in desired state of world, and remove if they no
// longer exist in the informer
func (dswp *desiredStateOfWorldPopulator) findAndRemoveDeletedPods() {
for dswPodUID, dswPodToAdd := range dswp.desiredStateOfWorld.GetPodToAdd() {
dswPodKey, err := kcache.MetaNamespaceKeyFunc(dswPodToAdd.Pod)
if err != nil {
glog.Errorf("MetaNamespaceKeyFunc failed for pod %q (UID %q) with: %v", dswPodKey, dswPodUID, err)
continue
}
// retrieve the pod object from pod informer with the namespace key
informerPodObj, exists, err := dswp.podInformer.GetStore().GetByKey(dswPodKey)
if err != nil || informerPodObj == nil {
glog.Errorf("podInformer GetByKey failed for pod %q (UID %q) with %v", dswPodKey, dswPodUID, err)
continue
}
if exists {
informerPod, ok := informerPodObj.(*api.Pod)
if !ok {
glog.Errorf("Failed to cast obj %#v to pod object for pod %q (UID %q)", informerPod, dswPodKey, dswPodUID)
continue
}
informerPodUID := volumehelper.GetUniquePodName(informerPod)
// Check whether the unique idenfier of the pod from dsw matches the one retrived from pod informer
if informerPodUID == dswPodUID {
glog.V(10).Infof(
"Verified pod %q (UID %q) from dsw exists in pod informer.", dswPodKey, dswPodUID)
continue
}
}
// the pod from dsw does not exist in pod informer, or it does not match the unique idenfier retrieved
// from the informer, delete it from dsw
glog.V(1).Infof(
"Removing pod %q (UID %q) from dsw because it does not exist in pod informer.", dswPodKey, dswPodUID)
dswp.desiredStateOfWorld.DeletePod(dswPodUID, dswPodToAdd.VolumeName, dswPodToAdd.NodeName)
}
}
func (kd *KubeDNS) getServiceFromEndpoints(e *kapi.Endpoints) (*kapi.Service, error) {
key, err := kcache.MetaNamespaceKeyFunc(e)
if err != nil {
return nil, err
}
obj, exists, err := kd.servicesStore.GetByKey(key)
if err != nil {
return nil, fmt.Errorf("failed to get service object from services store - %v", err)
}
if !exists {
glog.V(1).Infof("could not find service for endpoint %q in namespace %q", e.Name, e.Namespace)
return nil, nil
}
if svc, ok := assertIsService(obj); ok {
return svc, nil
}
return nil, fmt.Errorf("got a non service object in services store %v", obj)
}
// Returns true if the service corresponding to the given message has endpoints.
// Note: Works only for services with ClusterIP. Will return an error for headless service (service without a clusterIP).
// Important: Assumes that we already have the cacheLock. Callers responsibility to acquire it.
// This is because the code will panic, if we try to acquire it again if we already have it.
func (kd *KubeDNS) serviceWithClusterIPHasEndpoints(msg *skymsg.Service) (bool, error) {
svc, ok := kd.clusterIPServiceMap[msg.Host]
if !ok {
// It is a headless service.
return false, fmt.Errorf("method not expected to be called for headless service")
}
key, err := kcache.MetaNamespaceKeyFunc(svc)
if err != nil {
return false, err
}
e, exists, err := kd.endpointsStore.GetByKey(key)
if err != nil {
return false, fmt.Errorf("failed to get endpoints object from endpoints store - %v", err)
}
if !exists {
return false, nil
}
if e, ok := e.(*kapi.Endpoints); ok {
return len(e.Subsets) > 0, nil
}
return false, fmt.Errorf("unexpected: found non-endpoint object in endpoint store: %v", e)
}
// Generates skydns records for a headless service.
func (kd *KubeDNS) newHeadlessService(service *kapi.Service) error {
// Create an A record for every pod in the service.
// This record must be periodically updated.
// Format is as follows:
// For a service x, with pods a and b create DNS records,
// a.x.ns.domain. and, b.x.ns.domain.
key, err := kcache.MetaNamespaceKeyFunc(service)
if err != nil {
return err
}
e, exists, err := kd.endpointsStore.GetByKey(key)
if err != nil {
return fmt.Errorf("failed to get endpoints object from endpoints store - %v", err)
}
if !exists {
glog.V(1).Infof("Could not find endpoints for service %q in namespace %q. DNS records will be created once endpoints show up.", service.Name, service.Namespace)
return nil
}
if e, ok := e.(*kapi.Endpoints); ok {
return kd.generateRecordsForHeadlessService(e, service)
}
return nil
}