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seedclientprovider.go
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seedclientprovider.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 clientprovider
import (
"context"
"fmt"
"sync"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type SeedClientProvider interface {
GetClient(context.Context, string) (kubernetes.Interface, error)
}
type SeedClientProviderFactory interface {
New(clientmap.ClientMap) SeedClientProvider
}
type SeedClientProviderFactoryFunc func(cleintMap clientmap.ClientMap) SeedClientProvider
func (f SeedClientProviderFactoryFunc) New(clientMap clientmap.ClientMap) SeedClientProvider {
return f(clientMap)
}
var DefaultSeedClientProviderFactory = SeedClientProviderFactoryFunc(func(clientMap clientmap.ClientMap) SeedClientProvider {
return NewDefaultSeedClientProvider(clientMap)
})
var _ SeedClientProviderFactory = SeedClientProviderFactoryFunc(nil)
type seedClientProvider struct {
clientMap clientmap.ClientMap
seedClients map[string]kubernetes.Interface
lock sync.RWMutex
}
func NewDefaultSeedClientProvider(clientMap clientmap.ClientMap) *seedClientProvider {
return &seedClientProvider{
clientMap: clientMap,
seedClients: map[string]kubernetes.Interface{},
}
}
func (s *seedClientProvider) GetClient(ctx context.Context, seedName string) (kubernetes.Interface, error) {
seedClient, found := func() (kubernetes.Interface, bool) {
s.lock.RLock()
defer s.lock.RUnlock()
client, ok := s.seedClients[seedName]
return client, ok
}()
if found {
return seedClient, nil
}
gardenClient, err := s.clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, err
}
seed := &gardencorev1beta1.Seed{
ObjectMeta: metav1.ObjectMeta{
Name: seedName,
},
}
if err := gardenClient.Client().Get(ctx, client.ObjectKeyFromObject(seed), seed); err != nil {
return nil, fmt.Errorf("error geting seed: %v", client.ObjectKeyFromObject(seed))
}
seedSecretRef := seed.Spec.SecretRef
seedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: seedSecretRef.Name,
Namespace: seedSecretRef.Namespace,
},
}
if err := gardenClient.Client().Get(ctx, client.ObjectKeyFromObject(seedSecret), seedSecret); err != nil {
return nil, fmt.Errorf("error getting seed secret: %v", client.ObjectKeyFromObject(seedSecret))
}
client, err := kubernetes.NewClientFromSecret(ctx, gardenClient.Client(), seedSecretRef.Namespace, seedSecretRef.Name,
kubernetes.WithClientOptions(client.Options{
Scheme: kubernetes.SeedScheme,
}),
)
if err != nil {
return nil, err
}
seedClient = func() kubernetes.Interface {
s.lock.Lock()
defer s.lock.Unlock()
_, ok := s.seedClients[seedName]
if !ok {
s.seedClients[seedName] = client
}
return s.seedClients[seedName]
}()
return seedClient, nil
}