Implement Cacher for watch in apiserver

pkg/storage/util.go

@@ -20,6 +20,7 @@ import (
 	"strconv"
 
 	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/meta"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util/fielderrors"
 )
@@ -49,3 +50,11 @@ func ParseWatchResourceVersion(resourceVersion, kind string) (uint64, error) {
 	}
 	return version + 1, nil
 }
+
+func NamespaceKeyFunc(prefix string, obj runtime.Object) (string, error) {
+	meta, err := meta.Accessor(obj)
+	if err != nil {
+		return "", err
+	}
+	return prefix + "/" + meta.Namespace() + "/" + meta.Name(), nil
+}