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eventhandler_certificatesigningrequest.go
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eventhandler_certificatesigningrequest.go
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// Copyright 2021 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 graph
import (
"context"
"time"
certificatesv1 "k8s.io/api/certificates/v1"
toolscache "k8s.io/client-go/tools/cache"
"sigs.k8s.io/controller-runtime/pkg/cache"
"github.com/gardener/gardener/pkg/admissioncontroller/seedidentity"
"github.com/gardener/gardener/pkg/utils"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
)
func (g *graph) setupCertificateSigningRequestWatch(_ context.Context, informer cache.Informer) error {
_, err := informer.AddEventHandler(toolscache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if csrV1, ok := obj.(*certificatesv1.CertificateSigningRequest); ok {
g.handleCertificateSigningRequestCreate(csrV1.Name, csrV1.Spec.Request, csrV1.Spec.Usages)
return
}
},
DeleteFunc: func(obj interface{}) {
if tombstone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok {
obj = tombstone.Obj
}
if csrV1, ok := obj.(*certificatesv1.CertificateSigningRequest); ok {
g.handleCertificateSigningRequestDelete(csrV1.Name)
return
}
},
})
return err
}
func (g *graph) handleCertificateSigningRequestCreate(name string, request []byte, usages []certificatesv1.KeyUsage) {
start := time.Now()
defer func() {
metricUpdateDuration.WithLabelValues("CertificateSigningRequest", "Create").Observe(time.Since(start).Seconds())
}()
g.lock.Lock()
defer g.lock.Unlock()
x509cr, err := utils.DecodeCertificateRequest(request)
if err != nil {
return
}
if ok, _ := gardenerutils.IsSeedClientCert(x509cr, usages); !ok {
return
}
seedName, _ := seedidentity.FromCertificateSigningRequest(x509cr)
var (
certificateSigningRequestVertex = g.getOrCreateVertex(VertexTypeCertificateSigningRequest, "", name)
seedVertex = g.getOrCreateVertex(VertexTypeSeed, "", seedName)
)
g.addEdge(certificateSigningRequestVertex, seedVertex)
}
func (g *graph) handleCertificateSigningRequestDelete(name string) {
start := time.Now()
defer func() {
metricUpdateDuration.WithLabelValues("CertificateSigningRequest", "Delete").Observe(time.Since(start).Seconds())
}()
g.lock.Lock()
defer g.lock.Unlock()
g.deleteVertex(VertexTypeCertificateSigningRequest, "", name)
}