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admission.go
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admission.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package vpa
import (
"context"
"errors"
"io"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apiserver/pkg/admission"
"github.com/gardener/gardener/pkg/apis/core"
gardencorehelper "github.com/gardener/gardener/pkg/apis/core/helper"
plugin "github.com/gardener/gardener/plugin/pkg"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(plugin.PluginNameShootVPAEnabledByDefault, func(_ io.Reader) (admission.Interface, error) {
return New(), nil
})
}
// ShootVPA contains required information to process admission requests.
type ShootVPA struct {
*admission.Handler
}
// New creates a new ShootVPA admission plugin.
func New() admission.MutationInterface {
return &ShootVPA{
Handler: admission.NewHandler(admission.Create),
}
}
// Admit defaults spec.kubernetes.verticalPodAutoscaler.enabled=true for new shoot clusters.
func (c *ShootVPA) Admit(_ context.Context, a admission.Attributes, _ admission.ObjectInterfaces) error {
switch {
case a.GetKind().GroupKind() != core.Kind("Shoot"),
a.GetOperation() != admission.Create,
a.GetSubresource() != "":
return nil
}
shoot, ok := a.GetObject().(*core.Shoot)
if !ok {
return apierrors.NewInternalError(errors.New("could not convert resource into Shoot object"))
}
if shoot.Spec.Kubernetes.VerticalPodAutoscaler == nil && !gardencorehelper.IsWorkerless(shoot) {
shoot.Spec.Kubernetes.VerticalPodAutoscaler = &core.VerticalPodAutoscaler{Enabled: true}
}
return nil
}