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load_balancer_attributes_reconciler.go
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load_balancer_attributes_reconciler.go
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package elbv2
import (
"context"
awssdk "github.com/aws/aws-sdk-go/aws"
elbv2sdk "github.com/aws/aws-sdk-go/service/elbv2"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/aws-load-balancer-controller/pkg/algorithm"
"sigs.k8s.io/aws-load-balancer-controller/pkg/aws/services"
elbv2model "sigs.k8s.io/aws-load-balancer-controller/pkg/model/elbv2"
)
// reconciler for LoadBalancer attributes
type LoadBalancerAttributeReconciler interface {
// Reconcile loadBalancer attributes
Reconcile(ctx context.Context, resLB *elbv2model.LoadBalancer, sdkLB LoadBalancerWithTags) error
}
// NewDefaultLoadBalancerAttributeReconciler constructs new defaultLoadBalancerAttributeReconciler.
func NewDefaultLoadBalancerAttributeReconciler(elbv2Client services.ELBV2, logger logr.Logger) *defaultLoadBalancerAttributeReconciler {
return &defaultLoadBalancerAttributeReconciler{
elbv2Client: elbv2Client,
logger: logger,
}
}
var _ LoadBalancerAttributeReconciler = &defaultLoadBalancerAttributeReconciler{}
// default implementation for LoadBalancerAttributeReconciler
type defaultLoadBalancerAttributeReconciler struct {
elbv2Client services.ELBV2
logger logr.Logger
}
func (r *defaultLoadBalancerAttributeReconciler) Reconcile(ctx context.Context, resLB *elbv2model.LoadBalancer, sdkLB LoadBalancerWithTags) error {
desiredAttrs := r.getDesiredLoadBalancerAttributes(ctx, resLB)
currentAttrs, err := r.getCurrentLoadBalancerAttributes(ctx, sdkLB)
if err != nil {
return err
}
attributesToUpdate, _ := algorithm.DiffStringMap(desiredAttrs, currentAttrs)
if len(attributesToUpdate) > 0 {
req := &elbv2sdk.ModifyLoadBalancerAttributesInput{
LoadBalancerArn: sdkLB.LoadBalancer.LoadBalancerArn,
Attributes: nil,
}
for _, attrKey := range sets.StringKeySet(attributesToUpdate).List() {
req.Attributes = append(req.Attributes, &elbv2sdk.LoadBalancerAttribute{
Key: awssdk.String(attrKey),
Value: awssdk.String(attributesToUpdate[attrKey]),
})
}
r.logger.Info("modifying loadBalancer attributes",
"stackID", resLB.Stack().StackID(),
"resourceID", resLB.ID(),
"arn", awssdk.StringValue(sdkLB.LoadBalancer.LoadBalancerArn),
"change", attributesToUpdate)
if _, err := r.elbv2Client.ModifyLoadBalancerAttributesWithContext(ctx, req); err != nil {
return err
}
r.logger.Info("modified loadBalancer attributes",
"stackID", resLB.Stack().StackID(),
"resourceID", resLB.ID(),
"arn", awssdk.StringValue(sdkLB.LoadBalancer.LoadBalancerArn))
}
return nil
}
func (r *defaultLoadBalancerAttributeReconciler) getDesiredLoadBalancerAttributes(ctx context.Context, resLB *elbv2model.LoadBalancer) map[string]string {
lbAttributes := make(map[string]string, len(resLB.Spec.LoadBalancerAttributes))
for _, attr := range resLB.Spec.LoadBalancerAttributes {
lbAttributes[attr.Key] = attr.Value
}
return lbAttributes
}
func (r *defaultLoadBalancerAttributeReconciler) getCurrentLoadBalancerAttributes(ctx context.Context, sdkLB LoadBalancerWithTags) (map[string]string, error) {
req := &elbv2sdk.DescribeLoadBalancerAttributesInput{
LoadBalancerArn: sdkLB.LoadBalancer.LoadBalancerArn,
}
resp, err := r.elbv2Client.DescribeLoadBalancerAttributesWithContext(ctx, req)
if err != nil {
return nil, err
}
lbAttributes := make(map[string]string, len(resp.Attributes))
for _, attr := range resp.Attributes {
lbAttributes[awssdk.StringValue(attr.Key)] = awssdk.StringValue(attr.Value)
}
return lbAttributes, nil
}