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source.go
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source.go
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// Copyright (c) 2020 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 cmd
import (
"fmt"
"time"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/kubernetes"
kubernetesscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"sigs.k8s.io/controller-runtime/pkg/client/config"
"sigs.k8s.io/controller-runtime/pkg/manager"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
)
var (
sourceSchemeBuilder = runtime.NewSchemeBuilder(
kubernetesscheme.AddToScheme,
resourcesv1alpha1.AddToScheme,
)
// AddToSourceScheme registers all API types in the given scheme that resource-manager expects to be in the source
// cluster scheme (the Manager's scheme).
AddToSourceScheme = sourceSchemeBuilder.AddToScheme
)
var _ Option = &SourceClientOptions{}
// SourceClientOptions contains options needed to construct the source client.
type SourceClientOptions struct {
kubeconfigPath string
cacheResyncPeriod time.Duration
namespace string
sourceClient *SourceClientConfig
}
// SourceClientConfig contains the constructed source clients including a kubernetes ClientSet and Scheme.
type SourceClientConfig struct {
RESTConfig *rest.Config
CacheResyncPeriod *time.Duration
ClientSet *kubernetes.Clientset
Scheme *runtime.Scheme
Namespace string
}
// AddFlags adds the needed command line flags to the given FlagSet.
func (o *SourceClientOptions) AddFlags(fs *pflag.FlagSet) {
fs.StringVar(&o.kubeconfigPath, "kubeconfig", "", "path to the kubeconfig for the source cluster")
fs.StringVar(&o.namespace, "namespace", "", "namespace in which the ManagedResources should be observed (defaults to all namespaces)")
fs.DurationVar(&o.cacheResyncPeriod, "cache-resync-period", 24*time.Hour, "duration how often the controller's cache is resynced")
}
// Complete builds the source client based on the given flag values and saves it for retrieval via Completed.
func (o *SourceClientOptions) Complete() error {
restConfig, err := getSourceRESTConfig(o.kubeconfigPath)
if err != nil {
return fmt.Errorf("unable to create REST config for source cluster: %w", err)
}
clientSet, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return fmt.Errorf("could not create discovery client: %+v", err)
}
scheme := runtime.NewScheme()
utilruntime.Must(AddToSourceScheme(scheme))
cacheResyncPeriod := o.cacheResyncPeriod
o.sourceClient = &SourceClientConfig{
RESTConfig: restConfig,
CacheResyncPeriod: &cacheResyncPeriod,
ClientSet: clientSet,
Scheme: scheme,
Namespace: o.namespace,
}
return nil
}
// Completed returns the constructed source clients including a kubernetes ClientSet and Scheme.
func (o *SourceClientOptions) Completed() *SourceClientConfig {
return o.sourceClient
}
func getSourceRESTConfig(kubeconfigPath string) (*rest.Config, error) {
if kubeconfigPath != "" {
cfg, err := clientcmd.BuildConfigFromFlags("", kubeconfigPath)
if err != nil {
return nil, fmt.Errorf("could not instantiate rest config: %w", err)
}
return cfg, nil
}
return config.GetConfig()
}
// ApplyManagerOptions sets the values of this SourceClientConfig on the given manager.Options.
func (c *SourceClientConfig) ApplyManagerOptions(opts *manager.Options) {
opts.Scheme = c.Scheme
opts.SyncPeriod = c.CacheResyncPeriod
opts.Namespace = c.Namespace
}
// ApplyClientSet sets clientSet to the ClientSet of this config.
func (c *SourceClientConfig) ApplyClientSet(clientSet *kubernetes.Clientset) {
*clientSet = *c.ClientSet
}