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handler.go
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handler.go
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// Copyright (c) 2022 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 podschedulername
import (
"context"
"fmt"
"net/http"
"gomodules.xyz/jsonpatch/v2"
admissionv1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
var podGVK = metav1.GroupVersionKind{Group: "", Kind: "Pod", Version: "v1"}
type handler struct {
decoder *admission.Decoder
schedulerName string
}
// NewHandler returns a new handler.
func NewHandler(schedulerName string) admission.Handler {
return &handler{
schedulerName: schedulerName,
}
}
func (h *handler) InjectDecoder(d *admission.Decoder) error {
h.decoder = d
return nil
}
func (h *handler) Handle(_ context.Context, req admission.Request) admission.Response {
if req.Operation != admissionv1.Create {
return admission.Allowed("only 'create' operation is handled")
}
if req.Kind != podGVK {
return admission.Allowed("resource is not corev1.Pod")
}
if req.SubResource != "" {
return admission.Allowed("subresources on pods are not supported")
}
pod := &corev1.Pod{}
if err := h.decoder.Decode(req, pod); err != nil {
return admission.Errored(http.StatusUnprocessableEntity, err)
}
// Do not overwrite the scheduler name when a custom scheduler name is specified
if pod.Spec.SchedulerName != "" && pod.Spec.SchedulerName != corev1.DefaultSchedulerName {
return admission.Allowed("custom scheduler is specified")
}
return admission.Patched(
fmt.Sprintf("scheduler '%s' is configured", h.schedulerName),
jsonpatch.NewOperation("replace", "/spec/schedulerName", h.schedulerName),
)
}