/
service_watch.go
217 lines (199 loc) · 6.17 KB
/
service_watch.go
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package kubernetes
import (
"fmt"
_ "path/filepath"
"sync"
corev1 "k8s.io/api/core/v1"
_ "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
_ "k8s.io/client-go/tools/clientcmd"
_ "k8s.io/client-go/util/homedir"
)
type ServiceMap struct {
// Service name could be duplicated in different namespace, so here
// service name must not be the key of map. Therefore, a map with the
// following structure is constructed.
//
// namespace1:
// servicename1: ServiceInfo{}
// servicename2: ServiceInfo{}
// namespace2:
// servicename1: ServiceInfo{}
ServiceMap map[string]map[string]*K8sServiceInfo
mut sync.RWMutex
}
var GlobalServiceInfo = newServiceMap()
var serviceUpdatedMutex sync.Mutex
func newServiceMap() *ServiceMap {
return &ServiceMap{
ServiceMap: make(map[string]map[string]*K8sServiceInfo),
mut: sync.RWMutex{},
}
}
// GetServiceMatchLabels gets K8sServiceInfos which match labels in such namespace.
// Return empty slice if not found. Note there may be multiple matches.
func (s *ServiceMap) GetServiceMatchLabels(namespace string, labels map[string]string) []*K8sServiceInfo {
s.mut.RLock()
defer s.mut.RUnlock()
retServiceInfoSlice := make([]*K8sServiceInfo, 0)
serviceNameMap, ok := s.ServiceMap[namespace]
if !ok {
return retServiceInfoSlice
}
for _, serviceInfo := range serviceNameMap {
if len(serviceInfo.Selector) == 0 {
continue
}
if SelectorsMatchLabels(serviceInfo.Selector, labels) {
retServiceInfoSlice = append(retServiceInfoSlice, serviceInfo)
}
}
return retServiceInfoSlice
}
func (s *ServiceMap) add(info *K8sServiceInfo) {
s.mut.Lock()
defer s.mut.Unlock()
serviceNameMap, ok := s.ServiceMap[info.Namespace]
if !ok {
serviceNameMap = make(map[string]*K8sServiceInfo)
}
serviceNameMap[info.ServiceName] = info
s.ServiceMap[info.Namespace] = serviceNameMap
}
func (s *ServiceMap) delete(namespace string, serviceName string) {
s.mut.Lock()
defer s.mut.Unlock()
serviceNameMap, ok := s.ServiceMap[namespace]
if ok {
serviceInfo, ok := serviceNameMap[serviceName]
if ok {
// Set the value empty via its pointer, in which way all serviceInfo related to
// K8sPodInfo.K8sServiceInfo will be set to empty.
// The following data will be affected:
// - K8sMetaDataCache.containerIdInfo
// - K8sMetaDataCache.ipContainerInfo
// - K8sMetaDataCache.ipServiceInfo
serviceInfo.emptySelf()
}
}
}
func ServiceWatch(clientSet *kubernetes.Clientset, handler cache.ResourceEventHandler) {
stopper := make(chan struct{})
defer close(stopper)
factory := informers.NewSharedInformerFactory(clientSet, 0)
serviceInformer := factory.Core().V1().Services()
informer := serviceInformer.Informer()
defer runtime.HandleCrash()
go factory.Start(stopper)
if !cache.WaitForCacheSync(stopper, informer.HasSynced) {
runtime.HandleError(fmt.Errorf("timed out waiting for caches to sync"))
return
}
if handler != nil {
informer.AddEventHandler(handler)
} else {
informer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: AddService,
UpdateFunc: UpdateService,
DeleteFunc: DeleteService,
})
}
// TODO: use workqueue to avoid blocking
<-stopper
}
func AddService(obj interface{}) {
service := obj.(*corev1.Service)
sI := &K8sServiceInfo{
Ip: service.Spec.ClusterIP,
ServiceName: service.Name,
Namespace: service.Namespace,
isNodePort: service.Spec.Type == "NodePort",
Selector: service.Spec.Selector,
}
GlobalServiceInfo.add(sI)
// When new service is added, podInfo should be updated
podInfoSlice := GlobalPodInfo.getPodsMatchSelectors(sI.Namespace, sI.Selector)
for _, podInfo := range podInfoSlice {
for _, containerId := range podInfo.ContainerIds {
if podInfo, ok := MetaDataCache.GetPodByContainerId(containerId); ok {
sI.WorkloadName = podInfo.WorkloadName
sI.WorkloadKind = podInfo.WorkloadKind
podInfo.ServiceInfo = sI
}
}
// update Ip-Pod Map
for _, port := range podInfo.Ports {
if podInfo, ok := MetaDataCache.GetPodByIpPort(podInfo.Ip, uint32(port)); ok {
sI.WorkloadName = podInfo.WorkloadName
sI.WorkloadKind = podInfo.WorkloadKind
podInfo.ServiceInfo = sI
}
}
}
if sI.Ip == "" || sI.Ip == "None" {
return
}
for _, port := range service.Spec.Ports {
MetaDataCache.AddServiceByIpPort(service.Spec.ClusterIP, uint32(port.Port), sI)
if sI.isNodePort {
nodeAddresses := GlobalNodeInfo.getAllNodeAddresses()
for _, nodeAddress := range nodeAddresses {
MetaDataCache.AddServiceByIpPort(nodeAddress, uint32(port.NodePort), sI)
}
}
}
}
func UpdateService(objOld interface{}, objNew interface{}) {
oldSvc := objOld.(*corev1.Service)
newSvc := objNew.(*corev1.Service)
if oldSvc.ResourceVersion == newSvc.ResourceVersion {
return
}
serviceUpdatedMutex.Lock()
defer serviceUpdatedMutex.Unlock()
// TODO: re-implement the updated logic to reduce computation
DeleteService(objOld)
AddService(objNew)
}
func DeleteService(obj interface{}) {
// Maybe get DeletedFinalStateUnknown instead of *corev1.Pod.
// Fix https://github.com/KindlingProject/kindling/issues/445
service, ok := obj.(*corev1.Service)
if !ok {
deletedState, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
return
}
service, ok = deletedState.Obj.(*corev1.Service)
if !ok {
return
}
}
// 'delete' will delete all such service in MetaDataCache
GlobalServiceInfo.delete(service.Namespace, service.Name)
ip := service.Spec.ClusterIP
if ip == "" || ip == "None" {
return
}
for _, port := range service.Spec.Ports {
MetaDataCache.DeleteServiceByIpPort(ip, uint32(port.Port))
if service.Spec.Type == "NodePort" {
nodeAddresses := GlobalNodeInfo.getAllNodeAddresses()
for _, nodeAddress := range nodeAddresses {
MetaDataCache.DeleteServiceByIpPort(nodeAddress, uint32(port.NodePort))
}
}
}
}
// SelectorsMatchLabels return true only if labels match all [keys:values] with selectors
func SelectorsMatchLabels(selectors map[string]string, labels map[string]string) bool {
for key, value := range selectors {
if labelValue, ok := labels[key]; !ok || labelValue != value {
return false
}
}
return true
}