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route53.go
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route53.go
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package aws
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/aws/aws-sdk-go/service/route53/route53iface"
awsutil "github.com/openshift/hypershift/cmd/infra/aws/util"
"github.com/openshift/hypershift/cmd/log"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/retry"
)
func (o *CreateInfraOptions) LookupPublicZone(ctx context.Context, client route53iface.Route53API) (string, error) {
name := o.BaseDomain
id, err := lookupZone(ctx, client, name, false)
if err != nil {
log.Log.Error(err, "Public zone not found", "name", name)
return "", err
}
log.Log.Info("Found existing public zone", "name", name, "id", id)
return id, nil
}
func lookupZone(ctx context.Context, client route53iface.Route53API, name string, isPrivateZone bool) (string, error) {
var res *route53.HostedZone
f := func(resp *route53.ListHostedZonesOutput, lastPage bool) (shouldContinue bool) {
for idx, zone := range resp.HostedZones {
if zone.Config != nil && isPrivateZone == aws.BoolValue(zone.Config.PrivateZone) && strings.TrimSuffix(aws.StringValue(zone.Name), ".") == strings.TrimSuffix(name, ".") {
res = resp.HostedZones[idx]
return false
}
}
return !lastPage
}
if err := retryRoute53WithBackoff(ctx, func() error {
if err := client.ListHostedZonesPagesWithContext(ctx, &route53.ListHostedZonesInput{}, f); err != nil {
return err
}
return nil
}); err != nil {
return "", fmt.Errorf("failed to list hosted zones: %w", err)
}
if res == nil {
return "", fmt.Errorf("hosted zone %s not found", name)
}
return cleanZoneID(*res.Id), nil
}
func (o *CreateInfraOptions) CreatePrivateZone(ctx context.Context, client route53iface.Route53API, name, vpcID string) (string, error) {
id, err := lookupZone(ctx, client, name, true)
if err == nil {
log.Log.Info("Found existing private zone", "name", name, "id", id)
err := setSOAMinimum(ctx, client, id, name)
if err != nil {
return "", err
}
return id, err
}
var res *route53.CreateHostedZoneOutput
if err := retryRoute53WithBackoff(ctx, func() error {
callRef := fmt.Sprintf("%d", time.Now().Unix())
if output, err := client.CreateHostedZoneWithContext(ctx, &route53.CreateHostedZoneInput{
CallerReference: aws.String(callRef),
Name: aws.String(name),
HostedZoneConfig: &route53.HostedZoneConfig{
PrivateZone: aws.Bool(true),
},
VPC: &route53.VPC{
VPCId: aws.String(vpcID),
VPCRegion: aws.String(o.Region),
},
}); err != nil {
return err
} else {
res = output
return nil
}
}); err != nil {
return "", fmt.Errorf("failed to create hosted zone: %w", err)
}
if res == nil {
return "", fmt.Errorf("unexpected output from hosted zone creation")
}
id = cleanZoneID(*res.HostedZone.Id)
log.Log.Info("Created private zone", "name", name, "id", id)
err = setSOAMinimum(ctx, client, id, name)
if err != nil {
return "", err
}
return id, nil
}
func (o *DestroyInfraOptions) DestroyDNS(ctx context.Context, client route53iface.Route53API) []error {
var errs []error
errs = append(errs, o.CleanupPublicZone(ctx, client))
return errs
}
func (o *DestroyInfraOptions) DestroyPrivateZones(ctx context.Context, client route53iface.Route53API, vpcID *string) []error {
var output *route53.ListHostedZonesByVPCOutput
if err := retryRoute53WithBackoff(ctx, func() (err error) {
output, err = client.ListHostedZonesByVPCWithContext(ctx, &route53.ListHostedZonesByVPCInput{VPCId: vpcID, VPCRegion: aws.String(o.Region)})
return err
}); err != nil {
return []error{fmt.Errorf("failed to list hosted zones for vpc %s: %w", *vpcID, err)}
}
var errs []error
for _, zone := range output.HostedZoneSummaries {
id := cleanZoneID(*zone.HostedZoneId)
if err := deleteZone(ctx, id, client); err != nil {
return []error{fmt.Errorf("failed to delete private hosted zones for vpc %s: %w", *vpcID, err)}
}
log.Log.Info("Deleted private hosted zone", "id", id, "name", *zone.Name)
}
return errs
}
func (o *DestroyInfraOptions) CleanupPublicZone(ctx context.Context, client route53iface.Route53API) error {
name := o.BaseDomain
id, err := lookupZone(ctx, client, name, false)
if err != nil {
return nil
}
recordName := fmt.Sprintf("*.apps.%s.%s", o.Name, o.BaseDomain)
err = deleteRecord(ctx, client, id, recordName)
if err != nil {
if !isRoute53RecordNotFoundErr(err) {
return fmt.Errorf("failed to delete wildcard record from public zone %s: %w", id, err)
}
} else {
o.Log.Info("Deleted wildcard record from public hosted zone", "id", id, "name", recordName)
}
return nil
}
func setSOAMinimum(ctx context.Context, client route53iface.Route53API, id, name string) error {
recordSet, err := findRecord(ctx, client, id, name, "SOA")
if err != nil {
return err
}
if recordSet == nil || recordSet.ResourceRecords[0] == nil || recordSet.ResourceRecords[0].Value == nil {
return fmt.Errorf("SOA record for private zone %s not found: %w", name, err)
}
record := recordSet.ResourceRecords[0]
fields := strings.Split(*record.Value, " ")
if len(fields) != 7 {
return fmt.Errorf("SOA record value has %d fields, expected 7", len(fields))
}
fields[6] = "60"
record.Value = aws.String(strings.Join(fields, " "))
input := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: aws.String(id),
ChangeBatch: &route53.ChangeBatch{
Changes: []*route53.Change{
{
Action: aws.String("UPSERT"),
ResourceRecordSet: recordSet,
},
},
},
}
_, err = client.ChangeResourceRecordSetsWithContext(ctx, input)
return err
}
func deleteZone(ctx context.Context, id string, client route53iface.Route53API) error {
err := deleteRecords(ctx, client, id)
if err != nil {
return fmt.Errorf("failed to delete hosted zone records: %v", err)
}
if _, err = client.DeleteHostedZoneWithContext(ctx, &route53.DeleteHostedZoneInput{
Id: aws.String(id),
}); err != nil {
return fmt.Errorf("failed to delete hosted zone: %v", err)
}
return nil
}
func deleteRecords(ctx context.Context, client route53iface.Route53API, id string) error {
lrrsi := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(id),
}
output, err := client.ListResourceRecordSetsWithContext(ctx, lrrsi)
if err != nil {
return err
}
if len(output.ResourceRecordSets) == 0 {
return nil
}
var changeBatch route53.ChangeBatch
var deleteRequired bool
for _, rrs := range output.ResourceRecordSets {
if *rrs.Type == "NS" || *rrs.Type == "SOA" {
continue
}
deleteRequired = true
changeBatch.Changes = append(changeBatch.Changes, &route53.Change{
Action: aws.String("DELETE"),
ResourceRecordSet: rrs,
})
}
if !deleteRequired {
return nil
}
crrsi := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: aws.String(id),
ChangeBatch: &changeBatch,
}
if _, err := client.ChangeResourceRecordSetsWithContext(ctx, crrsi); err != nil {
return err
}
var deletedRecordNames []string
for _, changeBatch := range changeBatch.Changes {
deletedRecordNames = append(deletedRecordNames, *changeBatch.ResourceRecordSet.Name)
}
log.Log.Info("Deleted records from private hosted zone", "id", id, "names", deletedRecordNames)
return nil
}
func deleteRecord(ctx context.Context, client route53iface.Route53API, id, recordName string) error {
record, err := findRecord(ctx, client, id, recordName, "A")
if err != nil {
return err
}
// Change batch for deleting
changeBatch := &route53.ChangeBatch{
Changes: []*route53.Change{
{
Action: aws.String("DELETE"),
ResourceRecordSet: record,
},
},
}
input := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: aws.String(id),
ChangeBatch: changeBatch,
}
_, err = client.ChangeResourceRecordSetsWithContext(ctx, input)
return err
}
func findRecord(ctx context.Context, client route53iface.Route53API, id, name string, recordType string) (*route53.ResourceRecordSet, error) {
recordName := fqdn(strings.ToLower(name))
input := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(id),
StartRecordName: aws.String(recordName),
StartRecordType: aws.String(recordType),
MaxItems: aws.String("1"),
}
var record *route53.ResourceRecordSet
err := client.ListResourceRecordSetsPagesWithContext(ctx, input, func(resp *route53.ListResourceRecordSetsOutput, lastPage bool) bool {
if len(resp.ResourceRecordSets) == 0 {
return false
}
recordSet := resp.ResourceRecordSets[0]
responseName := strings.ToLower(cleanRecordName(*recordSet.Name))
responseType := strings.ToUpper(*recordSet.Type)
if recordName != responseName {
return false
}
if recordType != responseType {
return false
}
record = recordSet
return false
})
if err != nil {
return nil, err
}
if record == nil {
return nil, fmt.Errorf("record not found")
}
return record, nil
}
func fqdn(name string) string {
n := len(name)
if n == 0 || name[n-1] == '.' {
return name
} else {
return name + "."
}
}
func cleanZoneID(ID string) string {
return strings.TrimPrefix(ID, "/hostedzone/")
}
func cleanRecordName(name string) string {
str := name
s, err := strconv.Unquote(`"` + str + `"`)
if err != nil {
return str
}
return s
}
func retryRoute53WithBackoff(ctx context.Context, fn func() error) error {
backoff := wait.Backoff{
Duration: 1 * time.Second,
Steps: 10,
Factor: 1.5,
}
retriable := func(e error) bool {
if !awsutil.IsErrorRetryable(e) {
return false
}
select {
case <-ctx.Done():
return false
default:
return true
}
}
// TODO: inspect the error for throttling details?
return retry.OnError(backoff, retriable, fn)
}
func isRoute53RecordNotFoundErr(err error) bool {
if err != nil && strings.Contains(err.Error(), "record not found") {
return true
}
return false
}