service cidr controller manager

Controls the lifecycle of the ServiceCIDRs adding finalizers and
setting the Ready condition in status when they are created, and
removing the finalizers once it is safe to remove (no orphan IPAddresses)

An IPAddress is orphan if there are no ServiceCIDR containing it.

Change-Id: Icbe31e1ed8525fa04df3b741c8a817e5f2a49e80

cmd/kube-controller-manager/app/controllermanager.go

@@ -563,6 +563,9 @@ func NewControllerDescriptors() map[string]*ControllerDescriptor {
 			panic(fmt.Sprintf("alias %q conflicts with a controller name", alias))
 		}
 	}
+	if utilfeature.DefaultFeatureGate.Enabled(kubefeatures.MultiCIDRServiceAllocator) {
+		register(names.ServiceCIDRController, startServiceCIDRsController)
+	}
 
 	return controllers
 }

cmd/kube-controller-manager/app/networking.go

@@ -0,0 +1,38 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+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 app implements a server that runs a set of active
+// components.  This includes replication controllers, service endpoints and
+// nodes.
+package app
+
+import (
+	"context"
+
+	"k8s.io/controller-manager/controller"
+	"k8s.io/kubernetes/pkg/controller/servicecidrs"
+)
+
+func startServiceCIDRsController(ctx context.Context, controllerContext ControllerContext) (controller.Interface, bool, error) {
+	go servicecidrs.NewController(
+		controllerContext.InformerFactory.Networking().V1alpha1().ServiceCIDRs(),
+		controllerContext.InformerFactory.Networking().V1alpha1().IPAddresses(),
+		controllerContext.ClientBuilder.ClientOrDie("service-cidrs-controller"),
+	).Run(ctx, 5)
+	// TODO use component config
+	return nil, true, nil
+
+}

cmd/kube-controller-manager/names/controller_names.go

@@ -82,4 +82,5 @@ const (
 	ResourceClaimController                      = "resourceclaim-controller"
 	LegacyServiceAccountTokenCleanerController   = "legacy-serviceaccount-token-cleaner-controller"
 	ValidatingAdmissionPolicyStatusController    = "validatingadmissionpolicy-status-controller"
+	ServiceCIDRController                        = "service-cidr-controller"
 )