127 lines
3.5 KiB
Go
127 lines
3.5 KiB
Go
/*
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Copyright 2020 The Kruise Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package webhook
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import (
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"context"
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"fmt"
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"time"
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webhookutil "github.com/openkruise/rollouts/pkg/webhook/util"
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webhookcontroller "github.com/openkruise/rollouts/pkg/webhook/util/controller"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/client-go/rest"
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"k8s.io/klog/v2"
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"sigs.k8s.io/controller-runtime/pkg/manager"
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"sigs.k8s.io/controller-runtime/pkg/webhook"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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"sigs.k8s.io/controller-runtime/pkg/webhook/conversion"
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)
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type GateFunc func() (enabled bool)
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var (
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// HandlerMap contains all admission webhook handlers.
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HandlerMap = map[string]admission.Handler{}
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handlerGates = map[string]GateFunc{}
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)
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func addHandlers(m map[string]admission.Handler) {
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addHandlersWithGate(m, nil)
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}
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func addHandlersWithGate(m map[string]admission.Handler, fn GateFunc) {
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for path, handler := range m {
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if len(path) == 0 {
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klog.Warningf("Skip handler with empty path.")
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continue
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}
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if path[0] != '/' {
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path = "/" + path
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}
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_, found := HandlerMap[path]
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if found {
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klog.V(1).Infof("conflicting webhook builder path %v in handler map", path)
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}
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klog.Infof("add webhook path(%s)", path)
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HandlerMap[path] = handler
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if fn != nil {
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handlerGates[path] = fn
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}
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}
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}
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func filterActiveHandlers() {
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disablePaths := sets.NewString()
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for path := range HandlerMap {
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if fn, ok := handlerGates[path]; ok {
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if !fn() {
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disablePaths.Insert(path)
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}
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}
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}
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for _, path := range disablePaths.List() {
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delete(HandlerMap, path)
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}
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}
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func SetupWithManager(mgr manager.Manager) error {
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server := mgr.GetWebhookServer()
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server.Host = "0.0.0.0"
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server.Port = webhookutil.GetPort()
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server.CertDir = webhookutil.GetCertDir()
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// register admission handlers
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filterActiveHandlers()
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for path, handler := range HandlerMap {
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server.Register(path, &webhook.Admission{Handler: handler})
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klog.V(3).Infof("Registered webhook handler %s", path)
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}
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err := initialize(context.TODO(), mgr.GetConfig())
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if err != nil {
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return err
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}
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// register conversion webhook
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server.Register("/convert", &conversion.Webhook{})
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klog.Infof("webhook init done")
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return nil
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}
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// +kubebuilder:rbac:groups=core,resources=secrets,verbs=get;list;watch;create;update;patch;delete,namespace=system
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// +kubebuilder:rbac:groups=admissionregistration.k8s.io,resources=mutatingwebhookconfigurations,verbs=get;list;watch;update;patch
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// +kubebuilder:rbac:groups=admissionregistration.k8s.io,resources=validatingwebhookconfigurations,verbs=get;list;watch;update;patch
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// +kubebuilder:rbac:groups=apiextensions.k8s.io,resources=customresourcedefinitions,verbs=get;list;watch;update;patch
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func initialize(ctx context.Context, cfg *rest.Config) error {
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c, err := webhookcontroller.New(cfg, HandlerMap)
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if err != nil {
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return err
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}
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go func() {
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c.Start(ctx)
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}()
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timer := time.NewTimer(time.Second * 20)
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defer timer.Stop()
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select {
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case <-webhookcontroller.Inited():
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return nil
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case <-timer.C:
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return fmt.Errorf("failed to start webhook controller for waiting more than 20s")
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}
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}
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