/
main.go
133 lines (116 loc) · 4.05 KB
/
main.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
// Copyright © 2019 The OpenEBS 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 main
import (
"context"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/openebs/maya/pkg/webhook"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog"
clientset "github.com/openebs/maya/pkg/client/generated/clientset/versioned"
snapclientset "github.com/openebs/maya/pkg/client/generated/openebs.io/snapshot/v1/clientset/internalclientset"
)
var (
masterURL string
kubeconfig string
)
func main() {
var parameters webhook.Parameters
// get command line parameters
flag.IntVar(¶meters.Port, "port", 8443, "Webhook server port.")
flag.StringVar(¶meters.CertFile, "tlsCertFile", "/etc/webhook/certs/cert.pem", "File containing the x509 Certificate for HTTPS.")
flag.StringVar(¶meters.KeyFile, "tlsKeyFile", "/etc/webhook/certs/key.pem", "File containing the x509 private key to --tlsCertFile.")
klog.InitFlags(nil)
err := flag.Set("logtostderr", "true")
if err != nil {
klog.Info(err, "failed to set logtostderr flag")
}
flag.Parse()
// Get in cluster config
cfg, err := getClusterConfig(kubeconfig)
if err != nil {
klog.Fatalf("Error building kubeconfig: %s", err.Error())
}
// Building Kubernetes Clientset
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
klog.Fatalf("Error building kubernetes clientset: %s", err.Error())
}
// Building OpenEBS Clientset
openebsClient, err := clientset.NewForConfig(cfg)
if err != nil {
klog.Fatalf("Error building openebs clientset: %s", err.Error())
}
// Building Snapshot Clientset
snapClient, err := snapclientset.NewForConfig(cfg)
if err != nil {
klog.Fatalf("Error building openebs snapshot clientset: %s", err.Error())
}
// Fetch a reference to the admission server deployment object
ownerReference, err := webhook.GetAdmissionReference()
if err != nil {
klog.Fatal(err, "failed to get a reference to the admission deployment object")
}
validatorErr := webhook.InitValidationServer(*ownerReference)
if validatorErr != nil {
klog.Fatal(validatorErr, "failed to initialize validation server")
}
wh, err := webhook.New(parameters, kubeClient, openebsClient, snapClient)
if err != nil {
klog.Fatalf("failed to create validation webhook: %s", err.Error())
}
// define http server and server handler
mux := http.NewServeMux()
mux.HandleFunc("/validate", wh.Serve)
wh.Server.Handler = mux
// start webhook server in new routine
go func() {
if err := wh.Server.ListenAndServeTLS("", ""); err != nil {
klog.Errorf("Failed to listen and serve webhook server: %v", err)
}
}()
klog.Info("Webhook server started")
// listening OS shutdown singal
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
<-signalChan
klog.Infof("Got OS shutdown signal, shutting down webhook server gracefully...")
err = wh.Server.Shutdown(context.Background())
if err != nil {
klog.Errorf("failed to shutdown server: error {%v}", err)
}
}
// GetClusterConfig return the config for k8s.
func getClusterConfig(kubeconfig string) (*rest.Config, error) {
var masterURL string
cfg, err := rest.InClusterConfig()
if err != nil {
klog.Errorf("Failed to get k8s Incluster config. %+v", err)
if kubeconfig == "" {
return nil, fmt.Errorf("Kubeconfig is empty: %v", err.Error())
}
cfg, err = clientcmd.BuildConfigFromFlags(masterURL, kubeconfig)
if err != nil {
return nil, fmt.Errorf("Error building kubeconfig: %s", err.Error())
}
}
return cfg, err
}