make coip drift check a warning instead of error (kubernetes-sigs#2329)

Author: M00nF1sh

pkg/deploy/elbv2/load_balancer_manager.go

@@ -6,7 +6,6 @@ import (
 	awssdk "github.com/aws/aws-sdk-go/aws"
 	elbv2sdk "github.com/aws/aws-sdk-go/service/elbv2"
 	"github.com/go-logr/logr"
-	"github.com/pkg/errors"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"sigs.k8s.io/aws-load-balancer-controller/pkg/aws/services"
 	"sigs.k8s.io/aws-load-balancer-controller/pkg/deploy/tracking"
@@ -214,7 +213,9 @@ func (m *defaultLoadBalancerManager) updateSDKLoadBalancerWithSecurityGroups(ctx
 
 func (m *defaultLoadBalancerManager) checkSDKLoadBalancerWithCOIPv4Pool(_ context.Context, resLB *elbv2model.LoadBalancer, sdkLB LoadBalancerWithTags) error {
 	if awssdk.StringValue(resLB.Spec.CustomerOwnedIPv4Pool) != awssdk.StringValue(sdkLB.LoadBalancer.CustomerOwnedIpv4Pool) {
-		return errors.New("loadBalancer has drifted CustomerOwnedIPv4Pool setting")
+		m.logger.Info("loadBalancer has drifted CustomerOwnedIPv4Pool setting",
+			"desired", awssdk.StringValue(resLB.Spec.CustomerOwnedIPv4Pool),
+			"current", awssdk.StringValue(sdkLB.LoadBalancer.CustomerOwnedIpv4Pool))
 	}
 	return nil
 }

pkg/deploy/elbv2/load_balancer_manager_test.go

@@ -2,12 +2,12 @@ package elbv2
 
 import (
 	"context"
-	"errors"
 	awssdk "github.com/aws/aws-sdk-go/aws"
 	elbv2sdk "github.com/aws/aws-sdk-go/service/elbv2"
 	"github.com/stretchr/testify/assert"
 	coremodel "sigs.k8s.io/aws-load-balancer-controller/pkg/model/core"
 	elbv2model "sigs.k8s.io/aws-load-balancer-controller/pkg/model/elbv2"
+	"sigs.k8s.io/controller-runtime/pkg/log"
 	"testing"
 )
 
@@ -363,7 +363,7 @@ func Test_defaultLoadBalancerManager_checkSDKLoadBalancerWithCOIPv4Pool(t *testi
 					},
 				},
 			},
-			wantErr: errors.New("loadBalancer has drifted CustomerOwnedIPv4Pool setting"),
+			wantErr: nil,
 		},
 		{
 			name: "only resLB have CustomerOwnedIPv4Pool setting",
@@ -379,7 +379,7 @@ func Test_defaultLoadBalancerManager_checkSDKLoadBalancerWithCOIPv4Pool(t *testi
 					},
 				},
 			},
-			wantErr: errors.New("loadBalancer has drifted CustomerOwnedIPv4Pool setting"),
+			wantErr: nil,
 		},
 		{
 			name: "only sdkLB have CustomerOwnedIPv4Pool setting",
@@ -395,12 +395,14 @@ func Test_defaultLoadBalancerManager_checkSDKLoadBalancerWithCOIPv4Pool(t *testi
 					},
 				},
 			},
-			wantErr: errors.New("loadBalancer has drifted CustomerOwnedIPv4Pool setting"),
+			wantErr: nil,
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			m := &defaultLoadBalancerManager{}
+			m := &defaultLoadBalancerManager{
+				logger: &log.NullLogger{},
+			}
 			err := m.checkSDKLoadBalancerWithCOIPv4Pool(context.Background(), tt.args.resLB, tt.args.sdkLB)
 			if tt.wantErr != nil {
 				assert.EqualError(t, err, tt.wantErr.Error())