/
controller.go
161 lines (140 loc) · 4.82 KB
/
controller.go
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package controller
import (
"fmt"
"sort"
"sync"
"time"
"istio.io/istio/pkg/kube"
"istio.io/istio/pkg/log"
"istio.io/istio/pkg/servicemesh/apis/servicemesh/v1"
"istio.io/istio/pkg/servicemesh/client/clientset/versioned"
versioned_v1 "istio.io/istio/pkg/servicemesh/client/clientset/versioned/typed/servicemesh/v1"
"istio.io/istio/pkg/servicemesh/client/informers/externalversions"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
)
type serviceMeshMemberRollController struct {
informer cache.SharedIndexInformer
namespace string
memberRollName string
started bool
lock sync.Mutex
}
type MemberRollListener interface {
UpdateNamespaces(namespaces []string)
}
type MemberRollController interface {
Register(listener MemberRollListener)
Start(stop chan struct{})
}
func NewMemberRollControllerFromConfigFile(kubeConfig string, namespace string, memberRollName string, resync time.Duration) (MemberRollController, error) {
config, err := kube.BuildClientConfig(kubeConfig, "")
if err != nil {
fmt.Printf("Could not create k8s config: %v", err)
return nil, err
}
cs, err := versioned_v1.NewForConfig(config)
if err != nil {
fmt.Printf("Could not create k8s clientset: %v", err)
return nil, err
}
rc := cs.RESTClient()
return &serviceMeshMemberRollController{
informer: newMemberRollSharedInformer(rc, namespace, resync),
namespace: namespace,
memberRollName: memberRollName,
}, nil
}
func newMemberRollSharedInformer(restClient rest.Interface, namespace string, resync time.Duration) cache.SharedIndexInformer {
client := versioned.New(restClient)
return externalversions.NewSharedInformerFactoryWithOptions(client, resync,
externalversions.WithNamespace(namespace)).Maistra().V1().ServiceMeshMemberRolls().Informer()
}
func (smmrc *serviceMeshMemberRollController) Start(stop chan struct{}) {
smmrc.lock.Lock()
defer smmrc.lock.Unlock()
if !smmrc.started {
go smmrc.informer.Run(stop)
smmrc.started = true
}
}
func (smmrc *serviceMeshMemberRollController) Register(listener MemberRollListener) {
smmrc.informer.AddEventHandler(smmrc.newServiceMeshMemberRollListener(listener))
}
func (smmrc *serviceMeshMemberRollController) getNamespaces(namespaces []string) []string {
result := append([]string(nil), namespaces...)
found := false
for _, namespace := range namespaces {
if namespace == smmrc.namespace {
found = true
break
}
}
if !found {
result = append(result, smmrc.namespace)
}
return result
}
func (smmrc *serviceMeshMemberRollController) newServiceMeshMemberRollListener(listener MemberRollListener) cache.ResourceEventHandler {
return &serviceMeshMemberRollListener{
smmrc: smmrc,
listener: listener,
currentNamespaces: smmrc.getNamespaces(nil),
}
}
type serviceMeshMemberRollListener struct {
smmrc *serviceMeshMemberRollController
listener MemberRollListener
currentNamespaces []string
}
func (smmrl *serviceMeshMemberRollListener) checkEquality(lhs, rhs []string) bool {
if (lhs == nil) != (rhs == nil) {
return false
}
if len(lhs) != len(rhs) {
return false
}
for n, val := range lhs {
if val != rhs[n] {
return false
}
}
return true
}
func (smmrl *serviceMeshMemberRollListener) updateNamespaces(operation string, memberRollName string, members []string) {
if smmrl.smmrc.memberRollName != memberRollName {
log.Infof("ServiceMeshMemberRoll using incorrect name %v, ignoring", memberRollName)
} else {
namespaces := smmrl.smmrc.getNamespaces(members)
sort.Strings(namespaces)
if !smmrl.checkEquality(smmrl.currentNamespaces, namespaces) {
smmrl.currentNamespaces = namespaces
log.Infof("ServiceMeshMemberRoll %v %s, namespaces now %q", memberRollName, operation, smmrl.currentNamespaces)
smmrl.listener.UpdateNamespaces(smmrl.currentNamespaces)
}
}
}
func (smmrl *serviceMeshMemberRollListener) OnAdd(obj interface{}) {
serviceMeshMemberRoll := obj.(*v1.ServiceMeshMemberRoll)
smmrl.updateNamespaces("added", serviceMeshMemberRoll.Name, serviceMeshMemberRoll.Status.ConfiguredMembers)
}
func (smmrl *serviceMeshMemberRollListener) OnUpdate(oldObj, newObj interface{}) {
serviceMeshMemberRoll := newObj.(*v1.ServiceMeshMemberRoll)
smmrl.updateNamespaces("updated", serviceMeshMemberRoll.Name, serviceMeshMemberRoll.Status.ConfiguredMembers)
}
func (smmrl *serviceMeshMemberRollListener) OnDelete(obj interface{}) {
serviceMeshMemberRoll, ok := obj.(*v1.ServiceMeshMemberRoll)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
log.Errorf("Couldn't get object from tombstone %#v", obj)
return
}
serviceMeshMemberRoll, ok = tombstone.Obj.(*v1.ServiceMeshMemberRoll)
if !ok {
log.Errorf("Tombstone contained object that is not a service mesh member roll %#v", obj)
return
}
}
smmrl.updateNamespaces("deleted", serviceMeshMemberRoll.Name, nil)
}