Review Remarks

Author: trasc

pkg/builder/webhook.go

@@ -36,15 +36,16 @@ import (
 
 // WebhookBuilder builds a Webhook.
 type WebhookBuilder struct {
-	apiType         runtime.Object
-	customDefaulter admission.CustomDefaulter
-	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
+	apiType             runtime.Object
+	customDefaulter     admission.CustomDefaulter
+	customDefaulterOpts []admission.DefaulterOption
+	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.
@@ -65,9 +66,11 @@ func (blder *WebhookBuilder) For(apiType runtime.Object) *WebhookBuilder {
 	return blder
 }
 
-// WithDefaulter takes an admission.CustomDefaulter interface, a MutatingWebhook will be wired for this type.
-func (blder *WebhookBuilder) WithDefaulter(defaulter admission.CustomDefaulter) *WebhookBuilder {
+// WithDefaulter takes an admission.CustomDefaulter interface, a MutatingWebhook with the provided opts (admission.DefaulterOption)
+// will be wired for this type.
+func (blder *WebhookBuilder) WithDefaulter(defaulter admission.CustomDefaulter, opts ...admission.DefaulterOption) *WebhookBuilder {
 	blder.customDefaulter = defaulter
+	blder.customDefaulterOpts = opts
 	return blder
 }
 
@@ -170,7 +173,7 @@ func (blder *WebhookBuilder) registerDefaultingWebhook() {
 
 func (blder *WebhookBuilder) getDefaultingWebhook() *admission.Webhook {
 	if defaulter := blder.customDefaulter; defaulter != nil {
-		w := admission.WithCustomDefaulter(blder.mgr.GetScheme(), blder.apiType, defaulter)
+		w := admission.WithCustomDefaulter(blder.mgr.GetScheme(), blder.apiType, defaulter, blder.customDefaulterOpts...)
 		if blder.recoverPanic != nil {
 			w = w.WithRecoverPanic(*blder.recoverPanic)
 		}

pkg/webhook/admission/defaulter_custom.go

@@ -40,15 +40,18 @@ type defaulterOptions struct {
 	removeUnknownFields bool
 }
 
-type defaulterOption func(*defaulterOptions)
+// DefaulterOption defines the type of a CustomDefaulter's option
+type DefaulterOption func(*defaulterOptions)
 
-// DefaulterRemoveUnknownFields makes the defaulter prune the fields that are not recognized in the local scheme.
+// DefaulterRemoveUnknownFields makes the defaulter prune fields that are in the json object retrieved by the
+// webhook but not in the local go type. This happens for example when the CRD in the apiserver has fields that
+// our go type doesn't know about, because it's outdated.
 func DefaulterRemoveUnknownFields(o *defaulterOptions) {
 	o.removeUnknownFields = true
 }
 
 // WithCustomDefaulter creates a new Webhook for a CustomDefaulter interface.
-func WithCustomDefaulter(scheme *runtime.Scheme, obj runtime.Object, defaulter CustomDefaulter, opts ...defaulterOption) *Webhook {
+func WithCustomDefaulter(scheme *runtime.Scheme, obj runtime.Object, defaulter CustomDefaulter, opts ...DefaulterOption) *Webhook {
 	options := &defaulterOptions{}
 	for _, o := range opts {
 		o(options)