k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/pkg/controller/replication/replication_controller.go (about)

     1  /*
     2  Copyright 2014 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  // ### ATTENTION ###
    18  //
    19  // ReplicationManager is now just a wrapper around ReplicaSetController,
    20  // with a conversion layer that effectively treats ReplicationController
    21  // as if it were an older API version of ReplicaSet.
    22  //
    23  // However, RC and RS still have separate storage and separate instantiations
    24  // of the ReplicaSetController object.
    25  
    26  package replication
    27  
    28  import (
    29  	"context"
    30  
    31  	v1 "k8s.io/api/core/v1"
    32  	coreinformers "k8s.io/client-go/informers/core/v1"
    33  	clientset "k8s.io/client-go/kubernetes"
    34  	"k8s.io/client-go/kubernetes/scheme"
    35  	"k8s.io/client-go/tools/record"
    36  	"k8s.io/klog/v2"
    37  	"k8s.io/kubernetes/pkg/controller"
    38  	"k8s.io/kubernetes/pkg/controller/replicaset"
    39  )
    40  
    41  const (
    42  	BurstReplicas = replicaset.BurstReplicas
    43  )
    44  
    45  // ReplicationManager is responsible for synchronizing ReplicationController objects stored
    46  // in the system with actual running pods.
    47  // It is actually just a wrapper around ReplicaSetController.
    48  type ReplicationManager struct {
    49  	replicaset.ReplicaSetController
    50  }
    51  
    52  // NewReplicationManager configures a replication manager with the specified event recorder
    53  func NewReplicationManager(ctx context.Context, podInformer coreinformers.PodInformer, rcInformer coreinformers.ReplicationControllerInformer, kubeClient clientset.Interface, burstReplicas int) *ReplicationManager {
    54  	logger := klog.FromContext(ctx)
    55  	eventBroadcaster := record.NewBroadcaster(record.WithContext(ctx))
    56  	return &ReplicationManager{
    57  		*replicaset.NewBaseController(logger, informerAdapter{rcInformer}, podInformer, clientsetAdapter{kubeClient}, burstReplicas,
    58  			v1.SchemeGroupVersion.WithKind("ReplicationController"),
    59  			"replication_controller",
    60  			"replicationmanager",
    61  			podControlAdapter{controller.RealPodControl{
    62  				KubeClient: kubeClient,
    63  				Recorder:   eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "replication-controller"}),
    64  			}},
    65  			eventBroadcaster,
    66  		),
    67  	}
    68  }