forked from knative/pkg
/
controller.go
113 lines (93 loc) · 3.74 KB
/
controller.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
/*
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 defaulting
import (
"context"
// Injection stuff
kubeclient "knative.dev/pkg/client/injection/kube/client"
mwhinformer "knative.dev/pkg/client/injection/kube/informers/admissionregistration/v1/mutatingwebhookconfiguration"
secretinformer "knative.dev/pkg/injection/clients/namespacedkube/informers/core/v1/secret"
"knative.dev/pkg/logging"
pkgreconciler "knative.dev/pkg/reconciler"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/cache"
"knative.dev/pkg/controller"
"knative.dev/pkg/system"
"knative.dev/pkg/webhook"
"knative.dev/pkg/webhook/resourcesemantics"
)
// NewAdmissionController constructs a reconciler
func NewAdmissionController(
ctx context.Context,
name, path string,
handlers map[schema.GroupVersionKind]resourcesemantics.GenericCRD,
wc func(context.Context) context.Context,
disallowUnknownFields bool,
callbacks ...map[schema.GroupVersionKind]Callback,
) *controller.Impl {
client := kubeclient.Get(ctx)
mwhInformer := mwhinformer.Get(ctx)
secretInformer := secretinformer.Get(ctx)
options := webhook.GetOptions(ctx)
key := types.NamespacedName{Name: name}
// This not ideal, we are using a variadic argument to effectively make callbacks optional
// This allows this addition to be non-breaking to consumers of /pkg
// TODO: once all sub-repos have adopted this, we might move this back to a traditional param.
var unwrappedCallbacks map[schema.GroupVersionKind]Callback
switch len(callbacks) {
case 0:
unwrappedCallbacks = map[schema.GroupVersionKind]Callback{}
case 1:
unwrappedCallbacks = callbacks[0]
default:
panic("NewAdmissionController may not be called with multiple callback maps")
}
wh := &reconciler{
LeaderAwareFuncs: pkgreconciler.LeaderAwareFuncs{
// Have this reconciler enqueue our singleton whenever it becomes leader.
PromoteFunc: func(bkt pkgreconciler.Bucket, enq func(pkgreconciler.Bucket, types.NamespacedName)) error {
enq(bkt, key)
return nil
},
},
key: key,
path: path,
handlers: handlers,
callbacks: unwrappedCallbacks,
withContext: wc,
disallowUnknownFields: disallowUnknownFields,
secretName: options.SecretName,
client: client,
mwhlister: mwhInformer.Lister(),
secretlister: secretInformer.Lister(),
}
logger := logging.FromContext(ctx)
const queueName = "DefaultingWebhook"
c := controller.NewContext(ctx, wh, controller.ControllerOptions{WorkQueueName: queueName, Logger: logger.Named(queueName)})
// Reconcile when the named MutatingWebhookConfiguration changes.
mwhInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controller.FilterWithName(name),
// It doesn't matter what we enqueue because we will always Reconcile
// the named MWH resource.
Handler: controller.HandleAll(c.Enqueue),
})
// Reconcile when the cert bundle changes.
secretInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controller.FilterWithNameAndNamespace(system.Namespace(), wh.secretName),
// It doesn't matter what we enqueue because we will always Reconcile
// the named MWH resource.
Handler: controller.HandleAll(c.Enqueue),
})
return c
}