storageversionmigrator.go

Documentation: k8s.io/kubernetes/cmd/kube-controller-manager/app

     1  /*
     2  Copyright 2024 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package app
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  
    23  	"k8s.io/client-go/discovery"
    24  	"k8s.io/client-go/dynamic"
    25  	"k8s.io/client-go/metadata"
    26  	"k8s.io/controller-manager/controller"
    27  	"k8s.io/kubernetes/cmd/kube-controller-manager/names"
    28  	"k8s.io/kubernetes/pkg/features"
    29  
    30  	utilfeature "k8s.io/apiserver/pkg/util/feature"
    31  	clientgofeaturegate "k8s.io/client-go/features"
    32  	svm "k8s.io/kubernetes/pkg/controller/storageversionmigrator"
    33  )
    34  
    35  func newStorageVersionMigratorControllerDescriptor() *ControllerDescriptor {
    36  	return &ControllerDescriptor{
    37  		name:     names.StorageVersionMigratorController,
    38  		aliases:  []string{"svm"},
    39  		initFunc: startSVMController,
    40  	}
    41  }
    42  
    43  func startSVMController(
    44  	ctx context.Context,
    45  	controllerContext ControllerContext,
    46  	controllerName string,
    47  ) (controller.Interface, bool, error) {
    48  	if !utilfeature.DefaultFeatureGate.Enabled(features.StorageVersionMigrator) ||
    49  		!clientgofeaturegate.FeatureGates().Enabled(clientgofeaturegate.InformerResourceVersion) {
    50  		return nil, false, nil
    51  	}
    52  
    53  	if !controllerContext.ComponentConfig.GarbageCollectorController.EnableGarbageCollector {
    54  		return nil, true, fmt.Errorf("storage version migrator requires garbage collector")
    55  	}
    56  
    57  	config := controllerContext.ClientBuilder.ConfigOrDie(controllerName)
    58  	client := controllerContext.ClientBuilder.ClientOrDie(controllerName)
    59  	informer := controllerContext.InformerFactory.Storagemigration().V1alpha1().StorageVersionMigrations()
    60  
    61  	dynamicClient, err := dynamic.NewForConfig(config)
    62  	if err != nil {
    63  		return nil, false, err
    64  	}
    65  
    66  	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
    67  	if err != nil {
    68  		return nil, false, err
    69  	}
    70  
    71  	go svm.NewResourceVersionController(
    72  		ctx,
    73  		client,
    74  		discoveryClient,
    75  		metadata.NewForConfigOrDie(config),
    76  		informer,
    77  		controllerContext.RESTMapper,
    78  	).Run(ctx)
    79  
    80  	svmController := svm.NewSVMController(
    81  		ctx,
    82  		client,
    83  		dynamicClient,
    84  		informer,
    85  		controllerName,
    86  		controllerContext.RESTMapper,
    87  		controllerContext.GraphBuilder,
    88  	)
    89  	go svmController.Run(ctx)
    90  
    91  	return svmController, true, nil
    92  }
    93
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