-
Notifications
You must be signed in to change notification settings - Fork 2
/
main.go
160 lines (134 loc) · 5.21 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
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
/*
Copyright 2019 The Knative 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"
"log"
"go.uber.org/zap"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"knative.dev/pkg/configmap"
"knative.dev/pkg/logging"
"knative.dev/pkg/logging/logkey"
"knative.dev/pkg/signals"
"knative.dev/pkg/system"
"knative.dev/pkg/version"
"knative.dev/pkg/webhook"
"github.com/n3wscott/sources/pkg/apis/sources/v1alpha1"
)
const (
component = "webhook"
)
var (
masterURL = flag.String("master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
kubeconfig = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
)
type Store interface {
WatchConfigs(configmap.Watcher)
ToContext(context.Context) context.Context
}
type StoreFactory func(*zap.SugaredLogger) Store
func SharedMain(handlers map[schema.GroupVersionKind]webhook.GenericCRD, factories ...StoreFactory) {
flag.Parse()
cm, err := configmap.Load("/etc/config-logging")
if err != nil {
log.Fatal("Error loading logging configuration:", err)
}
config, err := logging.NewConfigFromMap(cm)
if err != nil {
log.Fatal("Error parsing logging configuration:", err)
}
logger, atomicLevel := logging.NewLoggerFromConfig(config, component)
defer logger.Sync()
logger = logger.With(zap.String(logkey.ControllerType, component))
logger.Info("Starting the Configuration Webhook")
// Set up signals so we handle the first shutdown signal gracefully.
ctx := signals.NewContext()
clusterConfig, err := clientcmd.BuildConfigFromFlags(*masterURL, *kubeconfig)
if err != nil {
logger.Fatalw("Failed to get cluster config", zap.Error(err))
}
kubeClient, err := kubernetes.NewForConfig(clusterConfig)
if err != nil {
logger.Fatalw("Failed to get the client set", zap.Error(err))
}
if err := version.CheckMinimumVersion(kubeClient.Discovery()); err != nil {
logger.Fatalw("Version check failed", err)
}
// Watch the logging config map and dynamically update logging levels.
configMapWatcher := configmap.NewInformedWatcher(kubeClient, system.Namespace())
configMapWatcher.Watch(logging.ConfigMapName(), logging.UpdateLevelFromConfigMap(logger, atomicLevel, component))
// If you want to control Defaulting or Validation, you can attach config state
// to the context by watching the configmap here, and then uncommenting the logic
// below.
stores := make([]Store, 0, len(factories))
for _, sf := range factories {
store := sf(logger)
store.WatchConfigs(configMapWatcher)
stores = append(stores, store)
}
if err = configMapWatcher.Start(ctx.Done()); err != nil {
logger.Fatalw("Failed to start the ConfigMap watcher", zap.Error(err))
}
options := webhook.ControllerOptions{
ServiceName: "webhook",
DeploymentName: "webhook",
Namespace: system.Namespace(),
Port: 8443,
SecretName: "webhook-certs",
ResourceMutatingWebhookName: fmt.Sprintf("webhook.%s.knative.dev", system.Namespace()),
}
controller, err := webhook.New(
kubeClient,
options,
map[string]webhook.AdmissionController{
"/": webhook.NewResourceAdmissionController(handlers, options, false),
},
logger,
func(ctx context.Context) context.Context {
for _, store := range stores {
ctx = store.ToContext(ctx)
}
return ctx
},
)
if err != nil {
logger.Fatalw("Failed to create admission controller", zap.Error(err))
}
if err = controller.Run(ctx.Done()); err != nil {
logger.Fatalw("Failed to start the admission controller", zap.Error(err))
}
}
func main() {
handlers := map[schema.GroupVersionKind]webhook.GenericCRD{
v1alpha1.SchemeGroupVersion.WithKind("JobSource"): &v1alpha1.JobSource{},
v1alpha1.SchemeGroupVersion.WithKind("CronJobSource"): &v1alpha1.CronJobSource{},
v1alpha1.SchemeGroupVersion.WithKind("ServiceSource"): &v1alpha1.ServiceSource{},
// Bind an alias of the Pod type to corev1.Pod for sidecar injection (via SetDefaults).
// The Knative webhook will subscribe to Pods and all subresources, which includes Bindings.
// We have to register a nop handler for Bindings so that all Pods don't get rejected.
corev1.SchemeGroupVersion.WithKind("Pod"): &v1alpha1.SourcePod{},
corev1.SchemeGroupVersion.WithKind("Binding"): &v1alpha1.NOPBinding{},
}
SharedMain(handlers)
// To setup a config "Store" to track a set of configurations and persist itself to
// the context passed to webhook invocations, you would pass something like this to
// SharedMain as well:
// func(logger *zap.SugaredLogger) Store {
// return apiconfig.NewStore(logger.Named("config-store"))
// }
}