eventhandler_serviceaccount.go

// Copyright (c) 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"
	"strings"
	"time"

	bootstraputil "github.com/gardener/gardener/pkg/gardenlet/bootstrap/util"

	corev1 "k8s.io/api/core/v1"
	apiequality "k8s.io/apimachinery/pkg/api/equality"
	toolscache "k8s.io/client-go/tools/cache"
	"sigs.k8s.io/controller-runtime/pkg/cache"
)

func (g *graph) setupServiceAccountWatch(_ context.Context, informer cache.Informer) {
	informer.AddEventHandler(toolscache.ResourceEventHandlerFuncs{
		AddFunc: func(obj interface{}) {
			serviceAccount, ok := obj.(*corev1.ServiceAccount)
			if !ok {
				return
			}

			if !strings.HasPrefix(serviceAccount.Name, bootstraputil.ServiceAccountNamePrefix) {
				return
			}

			g.handleServiceAccountCreateOrUpdate(serviceAccount)
		},

		UpdateFunc: func(oldObj, newObj interface{}) {
			oldServiceAccount, ok := oldObj.(*corev1.ServiceAccount)
			if !ok {
				return
			}

			newServiceAccount, ok := newObj.(*corev1.ServiceAccount)
			if !ok {
				return
			}

			if !apiequality.Semantic.DeepEqual(oldServiceAccount.Secrets, newServiceAccount.Secrets) {
				g.handleServiceAccountCreateOrUpdate(newServiceAccount)
			}
		},

		DeleteFunc: func(obj interface{}) {
			if tombstone, ok := obj.(toolscache.DeletedFinalStateUnknown); ok {
				obj = tombstone.Obj
			}
			serviceAccount, ok := obj.(*corev1.ServiceAccount)
			if !ok {
				return
			}

			if !strings.HasPrefix(serviceAccount.Name, bootstraputil.ServiceAccountNamePrefix) {
				return
			}

			g.handleServiceAccountDelete(serviceAccount)
		},
	})
}

func (g *graph) handleServiceAccountCreateOrUpdate(serviceAccount *corev1.ServiceAccount) {
	start := time.Now()
	defer func() {
		metricUpdateDuration.WithLabelValues("ServiceAccount", "CreateOrUpdate").Observe(time.Since(start).Seconds())
	}()
	g.lock.Lock()
	defer g.lock.Unlock()

	g.deleteAllIncomingEdges(VertexTypeSecret, VertexTypeServiceAccount, serviceAccount.Namespace, serviceAccount.Name)

	serviceAccountVertex := g.getOrCreateVertex(VertexTypeServiceAccount, serviceAccount.Namespace, serviceAccount.Name)

	for _, secret := range serviceAccount.Secrets {
		secretVertex := g.getOrCreateVertex(VertexTypeSecret, serviceAccount.Namespace, secret.Name)
		g.addEdge(secretVertex, serviceAccountVertex)
	}
}

func (g *graph) handleServiceAccountDelete(serviceAccount *corev1.ServiceAccount) {
	start := time.Now()
	defer func() {
		metricUpdateDuration.WithLabelValues("ServiceAccount", "Delete").Observe(time.Since(start).Seconds())
	}()
	g.lock.Lock()
	defer g.lock.Unlock()

	g.deleteVertex(VertexTypeServiceAccount, serviceAccount.Namespace, serviceAccount.Name)
}