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serviceaccessor.go
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serviceaccessor.go
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package dns
import (
"fmt"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/client/cache"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/watch"
)
// ServiceAccessor is the interface used by the ServiceResolver to access
// services.
type ServiceAccessor interface {
client.ServicesNamespacer
ServiceByPortalIP(ip string) (*api.Service, error)
}
// cachedServiceAccessor provides a cache of services that can answer queries
// about service lookups efficiently.
type cachedServiceAccessor struct {
reflector *cache.Reflector
store cache.Indexer
}
// cachedServiceAccessor implements ServiceAccessor
var _ ServiceAccessor = &cachedServiceAccessor{}
// NewCachedServiceAccessor returns a service accessor that can answer queries about services.
// It uses a backing cache to make PortalIP lookups efficient.
func NewCachedServiceAccessor(client *client.Client, stopCh <-chan struct{}) ServiceAccessor {
lw := cache.NewListWatchFromClient(client, "services", api.NamespaceAll, fields.Everything())
store := cache.NewIndexer(cache.MetaNamespaceKeyFunc, map[string]cache.IndexFunc{
"portalIP": indexServiceByPortalIP, // for reverse lookups
"namespace": cache.MetaNamespaceIndexFunc,
})
reflector := cache.NewReflector(lw, &api.Service{}, store, 2*time.Minute)
if stopCh != nil {
reflector.RunUntil(stopCh)
} else {
reflector.Run()
}
return &cachedServiceAccessor{
reflector: reflector,
store: store,
}
}
// ServiceByPortalIP returns the first service that matches the provided portalIP value.
// errors.IsNotFound(err) will be true if no such service exists.
func (a *cachedServiceAccessor) ServiceByPortalIP(ip string) (*api.Service, error) {
items, err := a.store.Index("portalIP", &api.Service{Spec: api.ServiceSpec{ClusterIP: ip}})
if err != nil {
return nil, err
}
if len(items) == 0 {
return nil, errors.NewNotFound(api.Resource("service"), "portalIP="+ip)
}
return items[0].(*api.Service), nil
}
// indexServiceByPortalIP creates an index between a portalIP and the service that
// uses it.
func indexServiceByPortalIP(obj interface{}) ([]string, error) {
return []string{obj.(*api.Service).Spec.ClusterIP}, nil
}
func (a *cachedServiceAccessor) Services(namespace string) client.ServiceInterface {
return cachedServiceNamespacer{a, namespace}
}
// TODO: needs to be unified with Registry interfaces once that work is done.
type cachedServiceNamespacer struct {
accessor *cachedServiceAccessor
namespace string
}
var _ client.ServiceInterface = cachedServiceNamespacer{}
func (a cachedServiceNamespacer) Get(name string) (*api.Service, error) {
item, ok, err := a.accessor.store.Get(&api.Service{ObjectMeta: api.ObjectMeta{Namespace: a.namespace, Name: name}})
if err != nil {
return nil, err
}
if !ok {
return nil, errors.NewNotFound(api.Resource("service"), name)
}
return item.(*api.Service), nil
}
func (a cachedServiceNamespacer) List(options api.ListOptions) (*api.ServiceList, error) {
if !options.LabelSelector.Empty() {
return nil, fmt.Errorf("label selection on the cache is not currently implemented")
}
items, err := a.accessor.store.Index("namespace", &api.Service{ObjectMeta: api.ObjectMeta{Namespace: a.namespace}})
if err != nil {
return nil, err
}
services := make([]api.Service, 0, len(items))
for i := range items {
services = append(services, *items[i].(*api.Service))
}
return &api.ServiceList{
// TODO: set ResourceVersion so that we can make watch work.
Items: services,
}, nil
}
func (a cachedServiceNamespacer) Create(srv *api.Service) (*api.Service, error) {
return nil, fmt.Errorf("not implemented")
}
func (a cachedServiceNamespacer) Update(srv *api.Service) (*api.Service, error) {
return nil, fmt.Errorf("not implemented")
}
func (a cachedServiceNamespacer) UpdateStatus(srv *api.Service) (*api.Service, error) {
return nil, fmt.Errorf("not implemented")
}
func (a cachedServiceNamespacer) Delete(name string) error {
return fmt.Errorf("not implemented")
}
func (a cachedServiceNamespacer) Watch(options api.ListOptions) (watch.Interface, error) {
return nil, fmt.Errorf("not implemented")
}
func (a cachedServiceNamespacer) ProxyGet(scheme, name, port, path string, params map[string]string) client.ResponseWrapper {
return nil
}