1// Copyright 2015 The etcd Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package auth
16
17import (
18	"github.com/prometheus/client_golang/prometheus"
19	"sync"
20)
21
22var (
23	currentAuthRevision = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
24		Namespace: "etcd_debugging",
25		Subsystem: "auth",
26		Name:      "revision",
27		Help:      "The current revision of auth store.",
28	},
29		func() float64 {
30			reportCurrentAuthRevMu.RLock()
31			defer reportCurrentAuthRevMu.RUnlock()
32			return reportCurrentAuthRev()
33		},
34	)
35	// overridden by auth store initialization
36	reportCurrentAuthRevMu sync.RWMutex
37	reportCurrentAuthRev   = func() float64 { return 0 }
38)
39
40func init() {
41	prometheus.MustRegister(currentAuthRevision)
42}
43