mirror of https://github.com/prometheus/prometheus
43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package uuid
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import (
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"sync"
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"github.com/pborman/uuid"
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"k8s.io/client-go/1.5/pkg/types"
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)
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var uuidLock sync.Mutex
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var lastUUID uuid.UUID
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func NewUUID() types.UID {
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uuidLock.Lock()
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defer uuidLock.Unlock()
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result := uuid.NewUUID()
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// The UUID package is naive and can generate identical UUIDs if the
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// time interval is quick enough.
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// The UUID uses 100 ns increments so it's short enough to actively
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// wait for a new value.
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for uuid.Equal(lastUUID, result) == true {
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result = uuid.NewUUID()
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}
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lastUUID = result
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return types.UID(result.String())
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}
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