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Drop remove operations from webhook patches (#3132)
* Drop remove operations from webhook patches that could be caused by unkown fields in the go types Change-Id: Iabc66880aef0227f60ec3deec9109cfb255fe2da * Resync webhook builder Change-Id: I4de1ebbe75a9220466c50381d0e708a1b6d23c8f * Rename Defaulter to LosslessDefaulter Change-Id: I232b1f2cd1a8a0c6b2f2fa7506da4d17d3e3ae55
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,263 @@ | ||
| /* | ||
| Copyright 2024 The Kubernetes 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 webhook | ||
|
|
||
| import ( | ||
| "errors" | ||
| "net/http" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/client-go/rest" | ||
| "k8s.io/klog/v2" | ||
|
|
||
| "sigs.k8s.io/controller-runtime/pkg/client/apiutil" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
| "sigs.k8s.io/controller-runtime/pkg/webhook/admission" | ||
| "sigs.k8s.io/controller-runtime/pkg/webhook/conversion" | ||
| ) | ||
|
|
||
| // This code is copied from https://github.com/kubernetes-sigs/controller-runtime/blob/896f6ded750155f9ecfdf4d8e10a26fc3fb78384/pkg/builder/webhook.go | ||
| // with one modification to get full control of the construction of patches: | ||
| // replacing CustomDefaulter with an admission.Handler. | ||
| // TODO(#3137): remove this file | ||
|
|
||
| // WebhookBuilder builds a Webhook. | ||
| type WebhookBuilder struct { | ||
| apiType runtime.Object | ||
| mutationHandler admission.Handler | ||
| customValidator admission.CustomValidator | ||
| gvk schema.GroupVersionKind | ||
| mgr manager.Manager | ||
| config *rest.Config | ||
| recoverPanic *bool | ||
| logConstructor func(base logr.Logger, req *admission.Request) logr.Logger | ||
| err error | ||
| } | ||
|
|
||
| // WebhookManagedBy returns a new webhook builder. | ||
| func WebhookManagedBy(m manager.Manager) *WebhookBuilder { | ||
| return &WebhookBuilder{mgr: m} | ||
| } | ||
|
|
||
| // TODO(droot): update the GoDoc for conversion. | ||
|
|
||
| // For takes a runtime.Object which should be a CR. | ||
| // If the given object implements the admission.Defaulter interface, a MutatingWebhook will be wired for this type. | ||
| // If the given object implements the admission.Validator interface, a ValidatingWebhook will be wired for this type. | ||
| func (blder *WebhookBuilder) For(apiType runtime.Object) *WebhookBuilder { | ||
| if blder.apiType != nil { | ||
| blder.err = errors.New("For(...) should only be called once, could not assign multiple objects for webhook registration") | ||
| } | ||
| blder.apiType = apiType | ||
| return blder | ||
| } | ||
|
|
||
| // WithDefaulter takes an admission.CustomDefaulter interface, a MutatingWebhook will be wired for this type. | ||
| func (blder *WebhookBuilder) WithMutationHandler(h admission.Handler) *WebhookBuilder { | ||
| blder.mutationHandler = h | ||
| return blder | ||
| } | ||
|
|
||
| // WithValidator takes a admission.CustomValidator interface, a ValidatingWebhook will be wired for this type. | ||
| func (blder *WebhookBuilder) WithValidator(validator admission.CustomValidator) *WebhookBuilder { | ||
| blder.customValidator = validator | ||
| return blder | ||
| } | ||
|
|
||
| // WithLogConstructor overrides the webhook's LogConstructor. | ||
| func (blder *WebhookBuilder) WithLogConstructor(logConstructor func(base logr.Logger, req *admission.Request) logr.Logger) *WebhookBuilder { | ||
| blder.logConstructor = logConstructor | ||
| return blder | ||
| } | ||
|
|
||
| // RecoverPanic indicates whether panics caused by the webhook should be recovered. | ||
| // Defaults to true. | ||
| func (blder *WebhookBuilder) RecoverPanic(recoverPanic bool) *WebhookBuilder { | ||
| blder.recoverPanic = &recoverPanic | ||
| return blder | ||
| } | ||
|
|
||
| // Complete builds the webhook. | ||
| func (blder *WebhookBuilder) Complete() error { | ||
| // Set the Config | ||
| blder.loadRestConfig() | ||
|
|
||
| // Configure the default LogConstructor | ||
| blder.setLogConstructor() | ||
|
|
||
| // Set the Webhook if needed | ||
| return blder.registerWebhooks() | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) loadRestConfig() { | ||
| if blder.config == nil { | ||
| blder.config = blder.mgr.GetConfig() | ||
| } | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) setLogConstructor() { | ||
| if blder.logConstructor == nil { | ||
| blder.logConstructor = func(base logr.Logger, req *admission.Request) logr.Logger { | ||
| log := base.WithValues( | ||
| "webhookGroup", blder.gvk.Group, | ||
| "webhookKind", blder.gvk.Kind, | ||
| ) | ||
| if req != nil { | ||
| return log.WithValues( | ||
| blder.gvk.Kind, klog.KRef(req.Namespace, req.Name), | ||
| "namespace", req.Namespace, "name", req.Name, | ||
| "resource", req.Resource, "user", req.UserInfo.Username, | ||
| "requestID", req.UID, | ||
| ) | ||
| } | ||
| return log | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) registerWebhooks() error { | ||
| typ, err := blder.getType() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| blder.gvk, err = apiutil.GVKForObject(typ, blder.mgr.GetScheme()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Register webhook(s) for type | ||
| blder.registerDefaultingWebhook() | ||
| blder.registerValidatingWebhook() | ||
|
|
||
| err = blder.registerConversionWebhook() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return blder.err | ||
| } | ||
|
|
||
| // registerDefaultingWebhook registers a defaulting webhook if necessary. | ||
| func (blder *WebhookBuilder) registerDefaultingWebhook() { | ||
| mwh := blder.getDefaultingWebhook() | ||
| if mwh != nil { | ||
| mwh.LogConstructor = blder.logConstructor | ||
| path := generateMutatePath(blder.gvk) | ||
|
|
||
| // Checking if the path is already registered. | ||
| // If so, just skip it. | ||
| if !blder.isAlreadyHandled(path) { | ||
| log := blder.mgr.GetLogger() | ||
| log.Info("Registering a mutating webhook", | ||
| "GVK", blder.gvk, | ||
| "path", path) | ||
| blder.mgr.GetWebhookServer().Register(path, mwh) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) getDefaultingWebhook() *admission.Webhook { | ||
| if handler := blder.mutationHandler; handler != nil { | ||
| w := &admission.Webhook{ | ||
| Handler: handler, | ||
| } | ||
| if blder.recoverPanic != nil { | ||
| w = w.WithRecoverPanic(*blder.recoverPanic) | ||
| } | ||
| return w | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // registerValidatingWebhook registers a validating webhook if necessary. | ||
| func (blder *WebhookBuilder) registerValidatingWebhook() { | ||
| vwh := blder.getValidatingWebhook() | ||
| if vwh != nil { | ||
| vwh.LogConstructor = blder.logConstructor | ||
| path := generateValidatePath(blder.gvk) | ||
|
|
||
| // Checking if the path is already registered. | ||
| // If so, just skip it. | ||
| if !blder.isAlreadyHandled(path) { | ||
| log := blder.mgr.GetLogger() | ||
| log.Info("Registering a validating webhook", | ||
| "GVK", blder.gvk, | ||
| "path", path) | ||
| blder.mgr.GetWebhookServer().Register(path, vwh) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) getValidatingWebhook() *admission.Webhook { | ||
| if validator := blder.customValidator; validator != nil { | ||
| w := admission.WithCustomValidator(blder.mgr.GetScheme(), blder.apiType, validator) | ||
| if blder.recoverPanic != nil { | ||
| w = w.WithRecoverPanic(*blder.recoverPanic) | ||
| } | ||
| return w | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) registerConversionWebhook() error { | ||
| log := blder.mgr.GetLogger() | ||
| ok, err := conversion.IsConvertible(blder.mgr.GetScheme(), blder.apiType) | ||
| if err != nil { | ||
| log.Error(err, "conversion check failed", "GVK", blder.gvk) | ||
| return err | ||
| } | ||
| if ok { | ||
| if !blder.isAlreadyHandled("/convert") { | ||
| blder.mgr.GetWebhookServer().Register("/convert", conversion.NewWebhookHandler(blder.mgr.GetScheme())) | ||
| } | ||
| log.Info("Conversion webhook enabled", "GVK", blder.gvk) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) getType() (runtime.Object, error) { | ||
| if blder.apiType != nil { | ||
| return blder.apiType, nil | ||
| } | ||
| return nil, errors.New("For() must be called with a valid object") | ||
| } | ||
|
|
||
| func (blder *WebhookBuilder) isAlreadyHandled(path string) bool { | ||
| if blder.mgr.GetWebhookServer().WebhookMux() == nil { | ||
| return false | ||
| } | ||
| h, p := blder.mgr.GetWebhookServer().WebhookMux().Handler(&http.Request{URL: &url.URL{Path: path}}) | ||
| if p == path && h != nil { | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| func generateMutatePath(gvk schema.GroupVersionKind) string { | ||
| return "/mutate-" + strings.ReplaceAll(gvk.Group, ".", "-") + "-" + | ||
| gvk.Version + "-" + strings.ToLower(gvk.Kind) | ||
| } | ||
|
|
||
| func generateValidatePath(gvk schema.GroupVersionKind) string { | ||
| return "/validate-" + strings.ReplaceAll(gvk.Group, ".", "-") + "-" + | ||
| gvk.Version + "-" + strings.ToLower(gvk.Kind) | ||
| } |
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