2 Copyright 2014 The Kubernetes Authors.
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
8 http://www.apache.org/licenses/LICENSE-2.0
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
22 "github.com/pborman/uuid"
24 "k8s.io/apimachinery/pkg/types"
27 var uuidLock sync.Mutex
28 var lastUUID uuid.UUID
30 func NewUUID() types.UID {
32 defer uuidLock.Unlock()
33 result := uuid.NewUUID()
34 // The UUID package is naive and can generate identical UUIDs if the
35 // time interval is quick enough.
36 // The UUID uses 100 ns increments so it's short enough to actively
37 // wait for a new value.
38 for uuid.Equal(lastUUID, result) == true {
39 result = uuid.NewUUID()
42 return types.UID(result.String())