pkg/controller/nodeipam/legacyprovider.go

//go:build !providerless
// +build !providerless

/*
Copyright 2019 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 nodeipam

import (
	"context"
	"fmt"
	"net"

	coreinformers "k8s.io/client-go/informers/core/v1"
	clientset "k8s.io/client-go/kubernetes"
	cloudprovider "k8s.io/cloud-provider"
	"k8s.io/klog/v2"

	"k8s.io/kubernetes/pkg/controller/nodeipam/ipam"
	nodesync "k8s.io/kubernetes/pkg/controller/nodeipam/ipam/sync"
)

func createLegacyIPAM(
	ctx context.Context,
	ic *Controller,
	nodeInformer coreinformers.NodeInformer,
	cloud cloudprovider.Interface,
	kubeClient clientset.Interface,
	clusterCIDRs []*net.IPNet,
	serviceCIDR *net.IPNet,
	nodeCIDRMaskSizes []int,
) (*ipam.Controller, error) {
	cfg := &ipam.Config{
		Resync:       ipamResyncInterval,
		MaxBackoff:   ipamMaxBackoff,
		InitialRetry: ipamInitialBackoff,
	}
	switch ic.allocatorType {
	case ipam.IPAMFromClusterAllocatorType:
		cfg.Mode = nodesync.SyncFromCluster
	case ipam.IPAMFromCloudAllocatorType:
		cfg.Mode = nodesync.SyncFromCloud
	}

	// we may end up here with no cidr at all in case of FromCloud/FromCluster
	var cidr *net.IPNet
	if len(clusterCIDRs) > 0 {
		cidr = clusterCIDRs[0]
	}
	logger := klog.FromContext(ctx)
	if len(clusterCIDRs) > 1 {
		logger.Info("Multiple cidrs were configured with FromCluster or FromCloud. cidrs except first one were discarded")
	}
	ipamc, err := ipam.NewController(ctx, cfg, kubeClient, cloud, cidr, serviceCIDR, nodeCIDRMaskSizes[0])
	if err != nil {
		return nil, fmt.Errorf("error creating ipam controller: %w", err)
	}
	if err := ipamc.Start(logger, nodeInformer); err != nil {
		return nil, fmt.Errorf("error trying to Init(): %w", err)
	}
	return ipamc, nil
}