-
Notifications
You must be signed in to change notification settings - Fork 395
/
metrics.go
92 lines (77 loc) · 2.7 KB
/
metrics.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
/*
Copyright 2024 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package metrics
import (
"context"
"sync"
"k8s.io/apiserver/pkg/authorization/authorizer"
"k8s.io/component-base/metrics"
"k8s.io/component-base/metrics/legacyregistry"
)
const (
namespace = "apiserver"
subsystem = "authorization"
)
var (
authorizationDecisionsTotal = metrics.NewCounterVec(
&metrics.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "decisions_total",
Help: "Total number of terminal decisions made by an authorizer split by authorizer type, name, and decision.",
StabilityLevel: metrics.ALPHA,
},
[]string{"type", "name", "decision"},
)
)
var registerMetrics sync.Once
func RegisterMetrics() {
registerMetrics.Do(func() {
legacyregistry.MustRegister(authorizationDecisionsTotal)
})
}
func ResetMetricsForTest() {
authorizationDecisionsTotal.Reset()
}
func RecordAuthorizationDecision(authorizerType, authorizerName, decision string) {
authorizationDecisionsTotal.WithLabelValues(authorizerType, authorizerName, decision).Inc()
}
func InstrumentedAuthorizer(authorizerType string, authorizerName string, delegate authorizer.Authorizer) authorizer.Authorizer {
RegisterMetrics()
return &instrumentedAuthorizer{
authorizerType: string(authorizerType),
authorizerName: authorizerName,
delegate: delegate,
}
}
type instrumentedAuthorizer struct {
authorizerType string
authorizerName string
delegate authorizer.Authorizer
}
func (a *instrumentedAuthorizer) Authorize(ctx context.Context, attributes authorizer.Attributes) (authorizer.Decision, string, error) {
decision, reason, err := a.delegate.Authorize(ctx, attributes)
switch decision {
case authorizer.DecisionNoOpinion:
// non-terminal, not reported
case authorizer.DecisionAllow:
// matches SubjectAccessReview status.allowed field name
RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "allowed")
case authorizer.DecisionDeny:
// matches SubjectAccessReview status.denied field name
RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "denied")
default:
RecordAuthorizationDecision(a.authorizerType, a.authorizerName, "unknown")
}
return decision, reason, err
}