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elb.go
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elb.go
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// Package elb implements ELB utilities.
package elb
import (
"context"
"errors"
"fmt"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/elbv2"
"github.com/aws/aws-sdk-go/service/elbv2/elbv2iface"
"go.uber.org/zap"
)
// DeleteELBv2 deletes all resources associated
// with the load balancer.
// TODO: is there a better way to clean up resources?
// ref. https://github.com/aws/aws-k8s-tester/issues/70
func DeleteELBv2(lg *zap.Logger, elb2API elbv2iface.ELBV2API, arn string, vpcID string, tags map[string]string) (err error) {
recurse := false
if arn == "" {
lg.Info("load balancer ARN not given, querying by VPC and cluster name",
zap.String("vpc-id", vpcID),
zap.String("tags", fmt.Sprintf("%+v", tags)),
)
elbARNs := make([]string, 0)
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
err = elb2API.DescribeLoadBalancersPagesWithContext(
ctx,
&elbv2.DescribeLoadBalancersInput{},
func(output *elbv2.DescribeLoadBalancersOutput, _ bool) bool {
for _, ev := range output.LoadBalancers {
arn := aws.StringValue(ev.LoadBalancerArn)
vpcID := aws.StringValue(ev.VpcId)
if vpcID == vpcID {
lg.Warn("found ELBv2 for this VPC",
zap.String("vpc-id", vpcID),
zap.String("elb-arn", arn),
)
elbARNs = append(elbARNs, arn)
} else {
lg.Info("found ELBv2 for other VPCs", zap.String("vpc-id", vpcID), zap.String("elb-arn", arn))
}
}
return true
})
cancel()
if err != nil {
lg.Warn("failed to describe ELBv2", zap.Error(err))
return errors.New("empty ELB ARN")
}
lg.Info("describing tags for elb", zap.Strings("elb-arns", elbARNs))
tout, err := elb2API.DescribeTags(&elbv2.DescribeTagsInput{ResourceArns: aws.StringSlice(elbARNs)})
if err != nil {
lg.Warn("failed to describe tags", zap.Error(err))
}
matchingARNs := make([]string, 0)
for _, desc := range tout.TagDescriptions {
copied := make(map[string]string)
for k, v := range tags {
copied[k] = v
}
elbARN := aws.StringValue(desc.ResourceArn)
for _, tv := range desc.Tags {
k, v1 := aws.StringValue(tv.Key), aws.StringValue(tv.Value)
lg.Info("found tag", zap.String("elb-arn", elbARN), zap.String("key", k), zap.String("value", v1))
if v2, ok := copied[k]; ok && v2 == v1 {
delete(copied, k)
lg.Info("found matching tag", zap.String("key", k), zap.String("value", v1))
}
}
if len(copied) == 0 {
lg.Info("found elb with matching tags; deleting", zap.String("elb-arn", elbARN))
matchingARNs = append(matchingARNs, elbARN)
}
}
lg.Info("matching elb", zap.Strings("elb-arns", matchingARNs))
switch {
case len(matchingARNs) == 0:
lg.Warn("could not found matching elb")
return errors.New("empty ELB ARN")
case len(matchingARNs) == 1:
lg.Warn("found 1 matching elb")
arn = matchingARNs[0]
case len(matchingARNs) > 1:
lg.Warn("found multiple matching elb")
arn = matchingARNs[0]
recurse = true
lg.Info("need recursively delete elb", zap.Strings("elb-arn", matchingARNs[1:]))
}
}
// deleteInOrder deletes listeners, target groups, and ELB in order.
if err = deleteInOrder(lg, elb2API, arn); err == nil {
lg.Info("successfully deleted ELB in order")
}
// deleteInReverseOrder deletes ELB and expects ENIs to be detached and deleted.
if err = deleteInReverseOrder(lg, elb2API, arn); err == nil {
lg.Info("successfully deleted ELB in reverse order")
}
if recurse {
// pass empty, so it can fetch recursively len(elbs) > 2
return DeleteELBv2(lg, elb2API, "", vpcID, tags)
}
return nil
}
// deleteInOrder deletes listeners, target groups, and ELB in order.
func deleteInOrder(lg *zap.Logger, elb2API elbv2iface.ELBV2API, arn string) error {
lbDeleted := false
// delete listener first
// e.g. ResourceInUse: Target group is currently in use by a listener or a rule
lg.Info("describing listeners", zap.String("arn", arn))
ls, err := elb2API.DescribeListeners(&elbv2.DescribeListenersInput{
LoadBalancerArn: aws.String(arn),
})
if err != nil {
if !isDeleted(err) {
return err
}
lbDeleted = true
lg.Info("load balancer has already been deleted", zap.Error(err))
}
if !lbDeleted && ls != nil && len(ls.Listeners) > 0 {
for _, lv := range ls.Listeners {
arn := aws.StringValue(lv.ListenerArn)
lg.Info("describing rules for listener", zap.String("listener-arn", arn))
ro, err := elb2API.DescribeRules(&elbv2.DescribeRulesInput{
ListenerArn: lv.ListenerArn,
})
if err != nil {
lg.Warn("failed to describe rules for listener", zap.Error(err))
} else {
for _, rv := range ro.Rules {
ruleArn := aws.StringValue(rv.RuleArn)
lg.Info("deleting rule for listener", zap.String("rule-arn", ruleArn))
_, err = elb2API.DeleteRule(&elbv2.DeleteRuleInput{
RuleArn: rv.RuleArn,
})
if err != nil {
lg.Info("failed to delete rule for listener", zap.String("rule-arn", ruleArn), zap.Error(err))
} else {
lg.Info("deleted rule for listener",
zap.String("listener-arn", arn),
zap.String("rule-arn", ruleArn),
)
}
}
}
lg.Info("deleting listener", zap.String("listener-arn", arn))
_, err = elb2API.DeleteListener(&elbv2.DeleteListenerInput{
ListenerArn: lv.ListenerArn,
})
if err != nil {
lg.Warn("failed to delete listener", zap.String("listener-arn", arn), zap.Error(err))
} else {
lg.Info("deleted listener", zap.String("listener-arn", arn))
}
}
}
lg.Info("describing target groups", zap.String("arn", arn))
to, err := elb2API.DescribeTargetGroups(&elbv2.DescribeTargetGroupsInput{
LoadBalancerArn: aws.String(arn),
})
if err != nil {
if !isDeleted(err) {
return err
}
lbDeleted = true
lg.Info("load balancer has already been deleted", zap.Error(err))
}
if !lbDeleted && to != nil && len(to.TargetGroups) > 0 {
for _, tv := range to.TargetGroups {
arn := aws.StringValue(tv.TargetGroupArn)
name := aws.StringValue(tv.TargetGroupName)
tp := aws.StringValue(tv.TargetType)
lg.Info("deleting target group",
zap.String("arn", arn),
zap.String("name", name),
zap.String("type", tp),
)
_, err = elb2API.DeleteTargetGroup(&elbv2.DeleteTargetGroupInput{
TargetGroupArn: tv.TargetGroupArn,
})
if err != nil {
lg.Warn("failed to delete target group", zap.Error(err))
} else {
lg.Info("deleted target group")
}
}
}
err = nil
if !lbDeleted {
for i := 0; i < 5; i++ {
time.Sleep(10 * time.Second)
lg.Info("deleting ELB in order", zap.String("arn", arn))
_, err = elb2API.DeleteLoadBalancer(&elbv2.DeleteLoadBalancerInput{
LoadBalancerArn: aws.String(arn),
})
if err == nil {
lg.Info("successfully deleted ELB in order")
lbDeleted = true
break
}
if isDeleted(err) {
err, lbDeleted = nil, true
lg.Info("ELB has already been deleted", zap.Error(err))
break
}
lg.Warn("failing to delete ELB in order", zap.Error(err))
}
}
if err == nil && lbDeleted {
lg.Info("deleted ELB in order")
return nil
}
if err != nil && lbDeleted {
return nil
}
if err != nil && !lbDeleted {
lg.Warn("failed to delete ELB in order", zap.Error(err))
}
return err
}
// deleteInReverseOrder deletes ELB and expects ENIs to be detached and deleted.
func deleteInReverseOrder(lg *zap.Logger, elb2API elbv2iface.ELBV2API, arn string) error {
var err error
for i := 0; i < 5; i++ {
time.Sleep(10 * time.Second)
lg.Info("deleting ELB in reverse order", zap.String("arn", arn))
_, err = elb2API.DeleteLoadBalancer(&elbv2.DeleteLoadBalancerInput{
LoadBalancerArn: aws.String(arn),
})
if err == nil {
lg.Info("successfully deleted ELB in reverse order")
lg.Info("waiting for ENI clean up after ELB deletion")
time.Sleep(30 * time.Second)
break
}
if isDeleted(err) {
lg.Info("ELB has already been deleted in order", zap.Error(err))
break
}
lg.Warn("failing to delete ELB in order", zap.Error(err))
}
return err
}
func isDeleted(err error) bool {
if err == nil {
return false
}
awsErr, ok := err.(awserr.Error)
if !ok {
return false
}
return awsErr.Code() == "LoadBalancerNotFound"
}