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statestore.go
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/
statestore.go
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package fi
import (
"fmt"
"k8s.io/kops/upup/pkg/fi/utils"
"k8s.io/kops/util/pkg/vfs"
"os"
"strings"
)
type WriteOption string
const (
WriteOptionCreate WriteOption = "Create"
WriteOptionOnlyIfExists WriteOption = "IfExists"
)
type StateStore interface {
// VFSPath returns the path where the StateStore is stored
VFSPath() vfs.Path
CA() CAStore
Secrets() SecretStore
ReadConfig(path string, config interface{}) error
WriteConfig(path string, config interface{}, options ...WriteOption) error
// ListChildren returns a list of all (direct) children of the specified path
// It only returns the raw names, not the prefixes
ListChildren(pathPrefix string) ([]string, error)
}
type VFSStateStore struct {
location vfs.Path
keystore CAStore
secrets SecretStore
}
var _ StateStore = &VFSStateStore{}
func NewVFSStateStore(base vfs.Path, clusterName string) *VFSStateStore {
location := base.Join(clusterName)
s := &VFSStateStore{
location: location,
}
s.keystore = NewVFSCAStore(location.Join("pki"))
s.secrets = NewVFSSecretStore(location.Join("secrets"))
return s
}
func (s *VFSStateStore) CA() CAStore {
return s.keystore
}
func (s *VFSStateStore) VFSPath() vfs.Path {
return s.location
}
func (s *VFSStateStore) Secrets() SecretStore {
return s.secrets
}
func (s *VFSStateStore) ListChildren(pathPrefix string) ([]string, error) {
vfsPath := s.location.Join(pathPrefix)
children, err := vfsPath.ReadDir()
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, fmt.Errorf("error listing children of %s: %v", pathPrefix, err)
}
var names []string
for _, child := range children {
names = append(names, child.Base())
}
return names, nil
}
func (s *VFSStateStore) ReadConfig(path string, config interface{}) error {
if path == "" {
return fmt.Errorf("path is required")
}
configPath := s.location.Join(path)
data, err := configPath.ReadFile()
if err != nil {
if os.IsNotExist(err) {
return err
}
return fmt.Errorf("error reading configuration file %s: %v", configPath, err)
}
// Yaml can't parse empty strings
configString := string(data)
configString = strings.TrimSpace(configString)
if configString != "" {
err = utils.YamlUnmarshal([]byte(configString), config)
if err != nil {
return fmt.Errorf("error parsing configuration: %v", err)
}
}
return nil
}
func (s *VFSStateStore) WriteConfig(path string, config interface{}, writeOptions ...WriteOption) error {
configPath := s.location.Join(path)
data, err := utils.YamlMarshal(config)
if err != nil {
return fmt.Errorf("error marshalling configuration: %v", err)
}
create := false
for _, writeOption := range writeOptions {
switch writeOption {
case WriteOptionCreate:
create = true
case WriteOptionOnlyIfExists:
_, err = configPath.ReadFile()
if err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("cannot update configuration file %s: does not exist", configPath)
}
return fmt.Errorf("error checking if configuration file %s exists already: %v", configPath, err)
}
default:
return fmt.Errorf("unknown write option: %q", writeOption)
}
}
if create {
err = configPath.CreateFile(data)
} else {
err = configPath.WriteFile(data)
}
if err != nil {
return fmt.Errorf("error writing configuration file %s: %v", configPath, err)
}
return nil
}