/
handler.go
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/
handler.go
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// Copyright 2023 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 endpointslicehints
import (
"context"
"fmt"
"github.com/go-logr/logr"
discoveryv1 "k8s.io/api/discovery/v1"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Handler handles admission requests and sets hints in EndpointSlice resouces.
type Handler struct {
Logger logr.Logger
}
// Default defaults the hints of the endpoints in the provided EndpointSlice.
func (h *Handler) Default(ctx context.Context, obj runtime.Object) error {
endpointSlice, ok := obj.(*discoveryv1.EndpointSlice)
if !ok {
return fmt.Errorf("expected *discoveryv1.EndpointSlice but got %T", obj)
}
req, err := admission.RequestFromContext(ctx)
if err != nil {
return err
}
log := h.Logger.WithValues("endpointSlice", kubernetesutils.ObjectKeyForCreateWebhooks(endpointSlice, req))
log.Info("Mutating endpoints' hints to the corresponding endpoint's zone")
for i, endpoint := range endpointSlice.Endpoints {
if endpoint.Zone != nil && len(*endpoint.Zone) > 0 {
endpointSlice.Endpoints[i].Hints = &discoveryv1.EndpointHints{
ForZones: []discoveryv1.ForZone{
{
Name: *endpoint.Zone,
},
},
}
}
}
return nil
}