/
watcher.go
201 lines (172 loc) · 4.83 KB
/
watcher.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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
package watcher
import (
"context"
"crypto/tls"
"github.com/bep/debounce"
"github.com/h3adex/guardgress/pkg/limithandler"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
"github.com/ulule/limiter/v3"
"k8s.io/api/networking/v1"
v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"sync"
"time"
)
var ingressClassName = "guardgress"
type Payload struct {
Ingresses *v1.IngressList
TlsCertificates map[string]*tls.Certificate
IngressLimiters []*limiter.Limiter
}
type Watcher struct {
Client kubernetes.Interface
UpdateServer func(payload Payload)
}
var (
ingressesGauge = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "watcher_ingresses_total",
Help: "Total number of ingresses",
})
ingressLimitersGauge = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "watcher_ingress_limiters_total",
Help: "Total number of ingress limiters",
})
tlsCertificatesGauge = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "watcher_tls_certificates_total",
Help: "Total number of TLS certificates",
})
)
func init() {
prometheus.MustRegister(ingressesGauge, ingressLimitersGauge, tlsCertificatesGauge)
}
func New(
client kubernetes.Interface,
updateServer func(payload Payload),
) *Watcher {
return &Watcher{
Client: client,
UpdateServer: updateServer,
}
}
func (p *Payload) countIngressLimiters() float64 {
var count float64 = 0
for _, ingress := range p.IngressLimiters {
if ingress == nil {
continue
}
count++
}
return count
}
func (w *Watcher) onChange() {
log.Debug("Updating routing table")
ingresses, err := listIngresses(w.Client)
if err != nil {
log.Error("unable to get k8s ingresses: ", err.Error())
}
payload := Payload{
TlsCertificates: map[string]*tls.Certificate{},
Ingresses: ingresses,
}
for _, ingress := range ingresses.Items {
if ingress.Spec.TLS == nil {
continue
}
ingressLimiters := limithandler.GetIngressLimiter(ingress)
payload.IngressLimiters = append(payload.IngressLimiters, ingressLimiters)
for _, tlsCert := range ingress.Spec.TLS {
if tlsCert.SecretName == "" {
continue
}
secret, err := w.Client.CoreV1().Secrets(ingress.Namespace).Get(context.Background(), tlsCert.SecretName, v12.GetOptions{})
if err != nil {
log.Error("getting secrets: ", err.Error())
continue
}
cert, err := tls.X509KeyPair(secret.Data["tls.crt"], secret.Data["tls.key"])
if err != nil {
log.Error("creating x509 key pair: ", err.Error())
}
for _, host := range tlsCert.Hosts {
payload.TlsCertificates[host] = &cert
}
}
}
ingressesGauge.Set(float64(len(ingresses.Items)))
ingressLimitersGauge.Set(payload.countIngressLimiters())
tlsCertificatesGauge.Set(float64(len(payload.TlsCertificates)))
w.UpdateServer(payload)
}
func (w *Watcher) Run(ctx context.Context) error {
log.Info("Starting Watcher")
factory := informers.NewSharedInformerFactory(w.Client, time.Minute)
debounced := debounce.New(time.Second)
handler := cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
debounced(func() {
w.onChange()
})
},
UpdateFunc: func(oldObj, newObj interface{}) {
debounced(func() {
w.onChange()
})
},
DeleteFunc: func(obj interface{}) {
debounced(func() {
w.onChange()
})
},
}
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
secretInformer := factory.Core().V1().Secrets().Informer()
_, err := secretInformer.AddEventHandler(handler)
if err != nil {
log.Error("unable to add secret informer: ", err.Error())
}
secretInformer.Run(ctx.Done())
wg.Done()
}()
wg.Add(1)
go func() {
ingressInformer := factory.Networking().V1().Ingresses().Informer()
_, err := ingressInformer.AddEventHandler(handler)
if err != nil {
log.Error("unable to add ingress informer: ", err.Error())
}
ingressInformer.Run(ctx.Done())
wg.Done()
}()
wg.Add(1)
go func() {
serviceInformer := factory.Core().V1().Services().Informer()
_, err := serviceInformer.AddEventHandler(handler)
if err != nil {
log.Error("unable to add service informer: ", err.Error())
}
serviceInformer.Run(ctx.Done())
wg.Done()
}()
return nil
}
// listIngresses returns a list of ingresses filtered by ingressClassName
func listIngresses(client kubernetes.Interface) (*v1.IngressList, error) {
// List all ingresses
allIngresses, err := client.NetworkingV1().Ingresses("").List(context.Background(), v12.ListOptions{})
if err != nil {
return nil, err
}
filteredIngresses := &v1.IngressList{}
// Filter ingresses based on ingressClassName
for _, ingress := range allIngresses.Items {
if ingress.Spec.IngressClassName == nil || *ingress.Spec.IngressClassName == ingressClassName {
filteredIngresses.Items = append(filteredIngresses.Items, ingress)
}
}
return filteredIngresses, nil
}