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|
package kubernetes
import (
"fmt"
"sync"
"time"
"k8s.io/client-go/1.5/kubernetes"
"k8s.io/client-go/1.5/pkg/api"
"k8s.io/client-go/1.5/pkg/api/v1"
"k8s.io/client-go/1.5/pkg/labels"
"k8s.io/client-go/1.5/pkg/runtime"
"k8s.io/client-go/1.5/pkg/watch"
"k8s.io/client-go/1.5/tools/cache"
)
var (
namespace = api.NamespaceAll
)
// storeToNamespaceLister makes a Store that lists Namespaces.
type storeToNamespaceLister struct {
cache.Store
}
// List lists all Namespaces in the store.
func (s *storeToNamespaceLister) List() (ns api.NamespaceList, err error) {
for _, m := range s.Store.List() {
ns.Items = append(ns.Items, *(m.(*api.Namespace)))
}
return ns, nil
}
type dnsController struct {
client *kubernetes.Clientset
selector *labels.Selector
svcController *cache.Controller
nsController *cache.Controller
svcLister cache.StoreToServiceLister
nsLister storeToNamespaceLister
// stopLock is used to enforce only a single call to Stop is active.
// Needed because we allow stopping through an http endpoint and
// allowing concurrent stoppers leads to stack traces.
stopLock sync.Mutex
shutdown bool
stopCh chan struct{}
}
// newDNSController creates a controller for CoreDNS.
func newdnsController(kubeClient *kubernetes.Clientset, resyncPeriod time.Duration, lselector *labels.Selector) *dnsController {
dns := dnsController{
client: kubeClient,
selector: lselector,
stopCh: make(chan struct{}),
}
dns.svcLister.Indexer, dns.svcController = cache.NewIndexerInformer(
&cache.ListWatch{
ListFunc: serviceListFunc(dns.client, namespace, dns.selector),
WatchFunc: serviceWatchFunc(dns.client, namespace, dns.selector),
},
&api.Service{},
resyncPeriod,
cache.ResourceEventHandlerFuncs{},
cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
dns.nsLister.Store, dns.nsController = cache.NewInformer(
&cache.ListWatch{
ListFunc: namespaceListFunc(dns.client, dns.selector),
WatchFunc: namespaceWatchFunc(dns.client, dns.selector),
},
&api.Namespace{}, resyncPeriod, cache.ResourceEventHandlerFuncs{})
return &dns
}
func serviceListFunc(c *kubernetes.Clientset, ns string, s *labels.Selector) func(api.ListOptions) (runtime.Object, error) {
return func(opts api.ListOptions) (runtime.Object, error) {
if s != nil {
opts.LabelSelector = *s
}
list_v1, err := c.Core().Services(ns).List(opts)
if err != nil {
return nil, err
}
var list_api api.ServiceList
err = v1.Convert_v1_ServiceList_To_api_ServiceList(list_v1, &list_api, nil)
if err != nil {
return nil, err
}
return &list_api, err
}
}
func serviceWatchFunc(c *kubernetes.Clientset, ns string, s *labels.Selector) func(options api.ListOptions) (watch.Interface, error) {
return func(options api.ListOptions) (watch.Interface, error) {
if s != nil {
options.LabelSelector = *s
}
return c.Core().Services(ns).Watch(options)
}
}
func namespaceListFunc(c *kubernetes.Clientset, s *labels.Selector) func(api.ListOptions) (runtime.Object, error) {
return func(opts api.ListOptions) (runtime.Object, error) {
if s != nil {
opts.LabelSelector = *s
}
list_v1, err := c.Core().Namespaces().List(opts)
if err != nil {
return nil, err
}
var list_api api.NamespaceList
err = v1.Convert_v1_NamespaceList_To_api_NamespaceList(list_v1, &list_api, nil)
if err != nil {
return nil, err
}
return &list_api, err
}
}
func namespaceWatchFunc(c *kubernetes.Clientset, s *labels.Selector) func(options api.ListOptions) (watch.Interface, error) {
return func(options api.ListOptions) (watch.Interface, error) {
if s != nil {
options.LabelSelector = *s
}
return c.Core().Namespaces().Watch(options)
}
}
func (dns *dnsController) controllersInSync() bool {
return dns.svcController.HasSynced()
}
// Stop stops the controller.
func (dns *dnsController) Stop() error {
dns.stopLock.Lock()
defer dns.stopLock.Unlock()
// Only try draining the workqueue if we haven't already.
if !dns.shutdown {
close(dns.stopCh)
dns.shutdown = true
return nil
}
return fmt.Errorf("shutdown already in progress")
}
// Run starts the controller.
func (dns *dnsController) Run() {
go dns.svcController.Run(dns.stopCh)
go dns.nsController.Run(dns.stopCh)
<-dns.stopCh
}
func (dns *dnsController) NamespaceList() *api.NamespaceList {
nsList, err := dns.nsLister.List()
if err != nil {
return &api.NamespaceList{}
}
return &nsList
}
func (dns *dnsController) ServiceList() []*api.Service {
svcs, err := dns.svcLister.List(labels.Everything())
if err != nil {
return []*api.Service{}
}
return svcs
}
// ServicesByNamespace returns a map of:
//
// namespacename :: [ kubernetesService ]
func (dns *dnsController) ServicesByNamespace() map[string][]api.Service {
k8sServiceList := dns.ServiceList()
items := make(map[string][]api.Service, len(k8sServiceList))
for _, i := range k8sServiceList {
namespace := i.Namespace
items[namespace] = append(items[namespace], *i)
}
return items
}
// ServiceInNamespace returns the Service that matches servicename in the namespace
func (dns *dnsController) ServiceInNamespace(namespace, servicename string) *api.Service {
svcObj, err := dns.svcLister.Services(namespace).Get(servicename)
if err != nil {
// TODO(...): should return err here
return nil
}
return svcObj
}
|
