forked from kubernetes/kops
/
aws_dns.go
213 lines (170 loc) · 5.02 KB
/
aws_dns.go
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package protokube
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/golang/glog"
"reflect"
"strings"
"time"
)
type Route53DNSProvider struct {
client *route53.Route53
zoneName string
zone *route53.HostedZone
}
func NewRoute53DNSProvider(zoneName string) (*Route53DNSProvider, error) {
if zoneName == "" {
return nil, fmt.Errorf("zone name is required")
}
p := &Route53DNSProvider{
zoneName: zoneName,
}
s := session.New()
s.Handlers.Send.PushFront(func(r *request.Request) {
// Log requests
glog.V(4).Infof("AWS API Request: %s/%s", r.ClientInfo.ServiceName, r.Operation.Name)
})
config := aws.NewConfig()
p.client = route53.New(s, config)
return p, nil
}
func (p *Route53DNSProvider) getZone() (*route53.HostedZone, error) {
if p.zone != nil {
return p.zone, nil
}
if !strings.Contains(p.zoneName, ".") {
// Looks like a zone ID
zoneID := p.zoneName
glog.Infof("Querying for hosted zone by id: %q", zoneID)
request := &route53.GetHostedZoneInput{
Id: aws.String(zoneID),
}
response, err := p.client.GetHostedZone(request)
if err != nil {
if AWSErrorCode(err) == "NoSuchHostedZone" {
glog.Infof("Zone not found with id %q; will reattempt by name", zoneID)
} else {
return nil, fmt.Errorf("error querying for DNS HostedZones %q: %v", zoneID, err)
}
} else {
p.zone = response.HostedZone
return p.zone, nil
}
}
glog.Infof("Querying for hosted zone by name: %q", p.zoneName)
findZone := p.zoneName
if !strings.HasSuffix(findZone, ".") {
findZone += "."
}
request := &route53.ListHostedZonesByNameInput{
DNSName: aws.String(findZone),
}
response, err := p.client.ListHostedZonesByName(request)
if err != nil {
return nil, fmt.Errorf("error querying for DNS HostedZones %q: %v", findZone, err)
}
var zones []*route53.HostedZone
for _, zone := range response.HostedZones {
if aws.StringValue(zone.Name) == findZone {
zones = append(zones, zone)
}
}
if len(zones) == 0 {
return nil, nil
}
if len(zones) != 1 {
return nil, fmt.Errorf("found multiple hosted zones matched name %q", findZone)
}
p.zone = zones[0]
return p.zone, nil
}
func (p *Route53DNSProvider) findResourceRecord(hostedZoneID string, name string, resourceType string) (*route53.ResourceRecordSet, error) {
name = strings.TrimSuffix(name, ".")
request := &route53.ListResourceRecordSetsInput{
HostedZoneId: aws.String(hostedZoneID),
// TODO: Start at correct name?
}
var found *route53.ResourceRecordSet
err := p.client.ListResourceRecordSetsPages(request, func(p *route53.ListResourceRecordSetsOutput, lastPage bool) (shouldContinue bool) {
for _, rr := range p.ResourceRecordSets {
if aws.StringValue(rr.Type) != resourceType {
continue
}
rrName := aws.StringValue(rr.Name)
rrName = strings.TrimSuffix(rrName, ".")
if name == rrName {
found = rr
break
}
}
// TODO: Also exit if we are on the 'next' name?
return found == nil
})
if err != nil {
return nil, fmt.Errorf("error listing DNS ResourceRecords: %v", err)
}
if found == nil {
return nil, nil
}
return found, nil
}
func (p *Route53DNSProvider) Set(fqdn string, recordType string, value string, ttl time.Duration) error {
zone, err := p.getZone()
if err != nil {
return err
}
// More correct, and makes the simple comparisons later on work correctly
if !strings.HasSuffix(fqdn, ".") {
fqdn += "."
}
existing, err := p.findResourceRecord(aws.StringValue(zone.Id), fqdn, recordType)
if err != nil {
return err
}
rrs := &route53.ResourceRecordSet{
Name: aws.String(fqdn),
Type: aws.String(recordType),
TTL: aws.Int64(int64(ttl.Seconds())),
ResourceRecords: []*route53.ResourceRecord{
{Value: aws.String(value)},
},
}
if existing != nil {
if reflect.DeepEqual(rrs, existing) {
glog.V(2).Infof("DNS %q %s record already set to %q", fqdn, recordType, value)
return nil
} else {
glog.Infof("ResourceRecordSet change:")
glog.Infof("Existing: %v", DebugString(existing))
glog.Infof("Desired: %v", DebugString(rrs))
}
}
change := &route53.Change{
Action: aws.String("UPSERT"),
ResourceRecordSet: rrs,
}
changeBatch := &route53.ChangeBatch{}
changeBatch.Changes = []*route53.Change{change}
request := &route53.ChangeResourceRecordSetsInput{}
request.HostedZoneId = zone.Id
request.ChangeBatch = changeBatch
glog.V(2).Infof("Updating DNS record %q", fqdn)
glog.V(4).Infof("route53 request: %s", DebugString(request))
response, err := p.client.ChangeResourceRecordSets(request)
if err != nil {
return fmt.Errorf("error creating ResourceRecordSets: %v", err)
}
glog.V(2).Infof("Change id is %q", aws.StringValue(response.ChangeInfo.Id))
return nil
}
// AWSErrorCode returns the aws error code, if it is an awserr.Error, otherwise ""
func AWSErrorCode(err error) string {
if awsError, ok := err.(awserr.Error); ok {
return awsError.Code()
}
return ""
}