Filter NodeBalancers when we know their ipv4

Author: okokes-akamai

cloud/linode/loadbalancers.go

@@ -450,7 +450,15 @@ func (l *loadbalancers) getNodeBalancerByHostname(ctx context.Context, service *
 }
 
 func (l *loadbalancers) getNodeBalancerByIPv4(ctx context.Context, service *v1.Service, ipv4 string) (*linodego.NodeBalancer, error) {
-	lbs, err := l.client.ListNodeBalancers(ctx, nil)
+	// TODO: use this constructor once we merge in linodego v1 update
+	// f := &linodego.Filter{}
+	// f.AddField(linodego.Eq, "ipv4", ipv4)
+	// filter, err := f.MarshalJSON()
+	// if err != nil {
+	// 	return nil, err
+	// }
+	filter := fmt.Sprintf(`{"ipv4": "%v"}`, ipv4)
+	lbs, err := l.client.ListNodeBalancers(ctx, &linodego.ListOptions{Filter: filter})
 	if err != nil {
 		return nil, err
 	}