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load_balancer_synthesizer.go
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load_balancer_synthesizer.go
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package elbv2
import (
"context"
"strings"
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"
"github.com/sonal-chauhan/aws-load-balancer-controller/pkg/aws/services"
"github.com/sonal-chauhan/aws-load-balancer-controller/pkg/deploy/tracking"
"github.com/sonal-chauhan/aws-load-balancer-controller/pkg/model/core"
elbv2model "github.com/sonal-chauhan/aws-load-balancer-controller/pkg/model/elbv2"
)
const (
lbAttrsDeletionProtectionEnabled = "deletion_protection.enabled"
)
// NewLoadBalancerSynthesizer constructs loadBalancerSynthesizer
func NewLoadBalancerSynthesizer(elbv2Client services.ELBV2, trackingProvider tracking.Provider, taggingManager TaggingManager,
lbManager LoadBalancerManager, logger logr.Logger, stack core.Stack) *loadBalancerSynthesizer {
return &loadBalancerSynthesizer{
elbv2Client: elbv2Client,
trackingProvider: trackingProvider,
taggingManager: taggingManager,
lbManager: lbManager,
logger: logger,
stack: stack,
}
}
// loadBalancerSynthesizer is responsible for synthesize LoadBalancer resources types for certain stack.
type loadBalancerSynthesizer struct {
elbv2Client services.ELBV2
trackingProvider tracking.Provider
taggingManager TaggingManager
lbManager LoadBalancerManager
logger logr.Logger
stack core.Stack
}
func (s *loadBalancerSynthesizer) Synthesize(ctx context.Context) error {
var resLBs []*elbv2model.LoadBalancer
s.stack.ListResources(&resLBs)
sdkLBs, err := s.findSDKLoadBalancers(ctx)
if err != nil {
return err
}
matchedResAndSDKLBs, unmatchedResLBs, unmatchedSDKLBs, err := matchResAndSDKLoadBalancers(resLBs, sdkLBs, s.trackingProvider.ResourceIDTagKey())
if err != nil {
return err
}
// For LoadBalancers, we delete unmatched ones first given below facts:
// * LoadBalancer delete will automatically delete listeners attached to it.
// * we can avoid the operation to detach a targetGroup from unmatched LBs. (a targetGroup can only attach to one LB).
// I don't like this, but it's the easiest solution to meet our requirement :D.
for _, sdkLB := range unmatchedSDKLBs {
if err := s.lbManager.Delete(ctx, sdkLB); err != nil {
errMessage := err.Error()
if strings.Contains(errMessage, "OperationNotPermitted") && strings.Contains(errMessage, "deletion protection") {
s.disableDeletionProtection(sdkLB.LoadBalancer)
if err = s.lbManager.Delete(ctx, sdkLB); err != nil {
return err
}
} else {
return err
}
}
}
for _, resLB := range unmatchedResLBs {
lbStatus, err := s.lbManager.Create(ctx, resLB)
if err != nil {
return err
}
resLB.SetStatus(lbStatus)
}
for _, resAndSDKLB := range matchedResAndSDKLBs {
lbStatus, err := s.lbManager.Update(ctx, resAndSDKLB.resLB, resAndSDKLB.sdkLB)
if err != nil {
return err
}
resAndSDKLB.resLB.SetStatus(lbStatus)
}
return nil
}
func (s *loadBalancerSynthesizer) disableDeletionProtection(lb *elbv2sdk.LoadBalancer) error {
input := &elbv2sdk.ModifyLoadBalancerAttributesInput{
Attributes: []*elbv2sdk.LoadBalancerAttribute{
{
Key: awssdk.String(lbAttrsDeletionProtectionEnabled),
Value: awssdk.String("false"),
},
},
LoadBalancerArn: lb.LoadBalancerArn,
}
_, err := s.elbv2Client.ModifyLoadBalancerAttributes(input)
return err
}
func (s *loadBalancerSynthesizer) PostSynthesize(ctx context.Context) error {
// nothing to do here.
return nil
}
// findSDKLoadBalancers will find all AWS LoadBalancer created for stack.
func (s *loadBalancerSynthesizer) findSDKLoadBalancers(ctx context.Context) ([]LoadBalancerWithTags, error) {
stackTags := s.trackingProvider.StackTags(s.stack)
stackTagsLegacy := s.trackingProvider.StackTagsLegacy(s.stack)
return s.taggingManager.ListLoadBalancers(ctx,
tracking.TagsAsTagFilter(stackTags),
tracking.TagsAsTagFilter(stackTagsLegacy))
}
type resAndSDKLoadBalancerPair struct {
resLB *elbv2model.LoadBalancer
sdkLB LoadBalancerWithTags
}
func matchResAndSDKLoadBalancers(resLBs []*elbv2model.LoadBalancer, sdkLBs []LoadBalancerWithTags,
resourceIDTagKey string) ([]resAndSDKLoadBalancerPair, []*elbv2model.LoadBalancer, []LoadBalancerWithTags, error) {
var matchedResAndSDKLBs []resAndSDKLoadBalancerPair
var unmatchedResLBs []*elbv2model.LoadBalancer
var unmatchedSDKLBs []LoadBalancerWithTags
resLBsByID := mapResLoadBalancerByResourceID(resLBs)
sdkLBsByID, err := mapSDKLoadBalancerByResourceID(sdkLBs, resourceIDTagKey)
if err != nil {
return nil, nil, nil, err
}
resLBIDs := sets.StringKeySet(resLBsByID)
sdkLBIDs := sets.StringKeySet(sdkLBsByID)
for _, resID := range resLBIDs.Intersection(sdkLBIDs).List() {
resLB := resLBsByID[resID]
sdkLBs := sdkLBsByID[resID]
foundMatch := false
for _, sdkLB := range sdkLBs {
if isSDKLoadBalancerRequiresReplacement(sdkLB, resLB) {
unmatchedSDKLBs = append(unmatchedSDKLBs, sdkLB)
continue
}
matchedResAndSDKLBs = append(matchedResAndSDKLBs, resAndSDKLoadBalancerPair{
resLB: resLB,
sdkLB: sdkLB,
})
foundMatch = true
}
if !foundMatch {
unmatchedResLBs = append(unmatchedResLBs, resLB)
}
}
for _, resID := range resLBIDs.Difference(sdkLBIDs).List() {
unmatchedResLBs = append(unmatchedResLBs, resLBsByID[resID])
}
for _, resID := range sdkLBIDs.Difference(resLBIDs).List() {
unmatchedSDKLBs = append(unmatchedSDKLBs, sdkLBsByID[resID]...)
}
return matchedResAndSDKLBs, unmatchedResLBs, unmatchedSDKLBs, nil
}
func mapResLoadBalancerByResourceID(resLBs []*elbv2model.LoadBalancer) map[string]*elbv2model.LoadBalancer {
resLBsByID := make(map[string]*elbv2model.LoadBalancer, len(resLBs))
for _, resLB := range resLBs {
resLBsByID[resLB.ID()] = resLB
}
return resLBsByID
}
func mapSDKLoadBalancerByResourceID(sdkLBs []LoadBalancerWithTags, resourceIDTagKey string) (map[string][]LoadBalancerWithTags, error) {
sdkLBsByID := make(map[string][]LoadBalancerWithTags, len(sdkLBs))
for _, sdkLB := range sdkLBs {
resourceID, ok := sdkLB.Tags[resourceIDTagKey]
if !ok {
return nil, errors.Errorf("unexpected loadBalancer with no resourceID: %v", awssdk.StringValue(sdkLB.LoadBalancer.LoadBalancerArn))
}
sdkLBsByID[resourceID] = append(sdkLBsByID[resourceID], sdkLB)
}
return sdkLBsByID, nil
}
// isSDKLoadBalancerRequiresReplacement checks whether a sdk LoadBalancer requires replacement to fulfill a LoadBalancer resource.
func isSDKLoadBalancerRequiresReplacement(sdkLB LoadBalancerWithTags, resLB *elbv2model.LoadBalancer) bool {
if string(resLB.Spec.Type) != awssdk.StringValue(sdkLB.LoadBalancer.Type) {
return true
}
if resLB.Spec.Scheme != nil && string(*resLB.Spec.Scheme) != awssdk.StringValue(sdkLB.LoadBalancer.Scheme) {
return true
}
return false
}