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vfs_secretstore.go
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vfs_secretstore.go
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package secrets
import (
"encoding/json"
"fmt"
"github.com/golang/glog"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/util/pkg/vfs"
"os"
)
type VFSSecretStore struct {
basedir vfs.Path
}
var _ fi.SecretStore = &VFSSecretStore{}
func NewVFSSecretStore(basedir vfs.Path) fi.SecretStore {
c := &VFSSecretStore{
basedir: basedir,
}
return c
}
func (s *VFSSecretStore) VFSPath() vfs.Path {
return s.basedir
}
func (c *VFSSecretStore) buildSecretPath(id string) vfs.Path {
return c.basedir.Join(id)
}
func (c *VFSSecretStore) FindSecret(id string) (*fi.Secret, error) {
p := c.buildSecretPath(id)
s, err := c.loadSecret(p)
if err != nil {
return nil, err
}
return s, nil
}
func (c *VFSSecretStore) ListSecrets() ([]string, error) {
files, err := c.basedir.ReadDir()
if err != nil {
return nil, fmt.Errorf("error listing secrets directory: %v", err)
}
var ids []string
for _, f := range files {
id := f.Base()
ids = append(ids, id)
}
return ids, nil
}
func (c *VFSSecretStore) Secret(id string) (*fi.Secret, error) {
s, err := c.FindSecret(id)
if err != nil {
return nil, err
}
if s == nil {
return nil, fmt.Errorf("Secret not found: %q", id)
}
return s, nil
}
func (c *VFSSecretStore) GetOrCreateSecret(id string, secret *fi.Secret) (*fi.Secret, bool, error) {
p := c.buildSecretPath(id)
for i := 0; i < 2; i++ {
s, err := c.FindSecret(id)
if err != nil {
return nil, false, err
}
if s != nil {
return s, false, nil
}
err = c.createSecret(secret, p)
if err != nil {
if os.IsExist(err) && i == 0 {
glog.Infof("Got already-exists error when writing secret; likely due to concurrent creation. Will retry")
continue
} else {
return nil, false, err
}
}
if err == nil {
break
}
}
// Make double-sure it round-trips
s, err := c.loadSecret(p)
if err != nil {
glog.Fatalf("unable to load secret immmediately after creation %v: %v", p, err)
return nil, false, err
}
return s, true, nil
}
func (c *VFSSecretStore) loadSecret(p vfs.Path) (*fi.Secret, error) {
data, err := p.ReadFile()
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
}
s := &fi.Secret{}
err = json.Unmarshal(data, s)
if err != nil {
return nil, fmt.Errorf("error parsing secret from %q: %v", p, err)
}
return s, nil
}
// createSecret writes the secret, but only if it does not exists
func (c *VFSSecretStore) createSecret(s *fi.Secret, p vfs.Path) error {
data, err := json.Marshal(s)
if err != nil {
return fmt.Errorf("error serializing secret: %v", err)
}
return p.CreateFile(data)
}