forked from openshift/hive
/
gcp.go
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/
gcp.go
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package nameserver
import (
"context"
"fmt"
"net/http"
"github.com/pkg/errors"
dns "google.golang.org/api/dns/v1"
"google.golang.org/api/googleapi"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/openshift/hive/pkg/constants"
controllerutils "github.com/openshift/hive/pkg/controller/utils"
gcpclient "github.com/openshift/hive/pkg/gcpclient"
)
// NewGCPQuery creates a new name server query for GCP.
func NewGCPQuery(c client.Client, credsSecretName string) Query {
return &gcpQuery{
getGCPClient: func() (gcpclient.Client, error) {
credsSecret := &corev1.Secret{}
if err := c.Get(
context.Background(),
client.ObjectKey{Namespace: constants.HiveNamespace, Name: credsSecretName},
credsSecret,
); err != nil {
return nil, errors.Wrap(err, "could not get the creds secret")
}
gcpClient, err := gcpclient.NewClientFromSecret(credsSecret)
return gcpClient, errors.Wrap(err, "error creating GCP client")
},
}
}
type gcpQuery struct {
getGCPClient func() (gcpclient.Client, error)
}
var _ Query = (*gcpQuery)(nil)
// Get implements Query.Get.
func (q *gcpQuery) Get(domain string) (map[string]sets.String, error) {
gcpClient, err := q.getGCPClient()
if err != nil {
return nil, errors.Wrap(err, "failed to get GCP client")
}
zoneName, err := q.queryZoneName(gcpClient, domain)
if err != nil {
return nil, errors.Wrap(err, "error querying zone name")
}
if zoneName == "" {
return nil, nil
}
currentNameServers, err := q.queryNameServers(gcpClient, zoneName)
return currentNameServers, errors.Wrap(err, "error querying name servers")
}
// Create implements Query.Create.
func (q *gcpQuery) Create(rootDomain string, domain string, values sets.String) error {
gcpClient, err := q.getGCPClient()
if err != nil {
return errors.Wrap(err, "failed to get GCP client")
}
zoneName, err := q.queryZoneName(gcpClient, rootDomain)
if err != nil {
return errors.Wrap(err, "error querying zone name")
}
if zoneName == "" {
return errors.New("no public managed zone found for domain")
}
return errors.Wrap(
q.createNameServers(gcpClient, zoneName, domain, values),
"error creating the name server",
)
}
// Delete implements Query.Delete.
func (q *gcpQuery) Delete(rootDomain string, domain string, values sets.String) error {
gcpClient, err := q.getGCPClient()
if err != nil {
return errors.Wrap(err, "failed to get GCP client")
}
zoneName, err := q.queryZoneName(gcpClient, rootDomain)
if err != nil {
return errors.Wrap(err, "error querying zone name")
}
if zoneName == "" {
return errors.New("no public managed zone found for domain")
}
if len(values) != 0 {
// If values were provided for the name servers, attempt to perform a
// delete using those values.
err = q.deleteNameServers(gcpClient, zoneName, domain, values)
gcpErr, ok := err.(*googleapi.Error)
if !ok {
return errors.Wrap(err, "error deleting the name server")
}
if gcpErr.Code == http.StatusNotFound {
return nil
}
if gcpErr.Code != http.StatusPreconditionFailed {
return errors.Wrap(err, "error deleting the name server")
}
}
// Since we do not have up-to-date values for the name servers, we need
// to query GCP for the current values to use them in the delete.
values, err = q.queryNameServer(gcpClient, zoneName, domain)
if err != nil {
return errors.Wrap(err, "error querying the current values of the name server")
}
if len(values) == 0 {
return nil
}
return errors.Wrap(
q.deleteNameServers(gcpClient, zoneName, domain, values),
"error deleting the name server with recently read values",
)
}
// queryZoneName queries GCP for the public managed zone for the specified domain.
func (q *gcpQuery) queryZoneName(gcpClient gcpclient.Client, domain string) (string, error) {
listOpts := gcpclient.ListManagedZonesOptions{
DNSName: controllerutils.Dotted(domain),
}
for {
listOutput, err := gcpClient.ListManagedZones(listOpts)
if err != nil {
return "", err
}
for _, zone := range listOutput.ManagedZones {
if zone.Visibility != "public" {
continue
}
return zone.Name, nil
}
if listOutput.NextPageToken == "" {
return "", nil
}
listOpts.PageToken = listOutput.NextPageToken
}
}
// queryNameServers queries GCP for the name servers in the specified managed zone.
func (q *gcpQuery) queryNameServers(gcpClient gcpclient.Client, managedZone string) (map[string]sets.String, error) {
nameServers := map[string]sets.String{}
listOpts := gcpclient.ListResourceRecordSetsOptions{}
for {
listOutput, err := gcpClient.ListResourceRecordSets(managedZone, listOpts)
if err != nil {
return nil, err
}
for _, recordSet := range listOutput.Rrsets {
if recordSet.Type != "NS" {
continue
}
values := sets.NewString()
for _, v := range recordSet.Rrdatas {
values.Insert(controllerutils.Undotted(v))
}
nameServers[controllerutils.Undotted(recordSet.Name)] = values
}
if listOutput.NextPageToken == "" {
return nameServers, nil
}
listOpts.PageToken = listOutput.NextPageToken
}
}
// queryNameServer queries GCP for the name servers for the specified domain in the specified managed zone.
func (q *gcpQuery) queryNameServer(gcpClient gcpclient.Client, managedZone string, domain string) (sets.String, error) {
listOutput, err := gcpClient.ListResourceRecordSets(
managedZone,
gcpclient.ListResourceRecordSetsOptions{
MaxResults: 1,
Name: controllerutils.Dotted(domain),
Type: "NS",
},
)
if err != nil {
return nil, err
}
if len(listOutput.Rrsets) == 0 {
return nil, nil
}
values := sets.NewString()
for _, v := range listOutput.Rrsets[0].Rrdatas {
values.Insert(controllerutils.Undotted(v))
}
return values, nil
}
// createNameServers creates the name servers for the specified domain in the specified managed zone.
func (q *gcpQuery) createNameServers(gcpClient gcpclient.Client, managedZone string, domain string, values sets.String) error {
err := gcpClient.AddResourceRecordSet(managedZone, q.resourceRecordSet(domain, values))
if gcpErr, ok := err.(*googleapi.Error); ok && gcpErr.Code == http.StatusConflict {
// this means there is already an existing resource record, so we need
// to fall through to the update path
} else if err != nil {
return errors.Wrap(err, "unexpected error creating NS record")
} else {
return nil
}
// An update using the GCP API involves listing the current set of records
// for removal, and adding the new desired set of records as additions.
response, err := gcpClient.ListResourceRecordSets(managedZone, gcpclient.ListResourceRecordSetsOptions{
Name: controllerutils.Dotted(domain),
Type: "NS",
})
if err != nil {
errors.Wrap(err, "failed to list existing record sets")
}
switch len(response.Rrsets) {
case 1:
// Exactly one NS record that needs updating
currentNSValues := sets.NewString(response.Rrsets[0].Rrdatas...)
addRRSet := q.resourceRecordSet(domain, values)
removeRRSet := q.resourceRecordSet(domain, currentNSValues)
err := gcpClient.UpdateResourceRecordSet(managedZone, addRRSet, removeRRSet)
return errors.Wrap(err, "failed to update existing NS entry")
default:
return fmt.Errorf("unexpected response when querying domain")
}
}
// deleteNameServers deletes the name servers for the specified domain in the specified managed zone.
func (q *gcpQuery) deleteNameServers(gcpClient gcpclient.Client, managedZone string, domain string, values sets.String) error {
return gcpClient.DeleteResourceRecordSet(managedZone, q.resourceRecordSet(domain, values))
}
func (q *gcpQuery) resourceRecordSet(domain string, values sets.String) *dns.ResourceRecordSet {
dottedValues := make([]string, len(values))
for i, v := range values.List() {
dottedValues[i] = controllerutils.Dotted(v)
}
return &dns.ResourceRecordSet{
Name: controllerutils.Dotted(domain),
Rrdatas: dottedValues,
Ttl: int64(60),
Type: "NS",
}
}