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tailscale/ipn/store/kubestore/store_kube.go

97 lines
2.3 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package kubestore contains an ipn.StateStore implementation using Kubernetes Secrets.
package kubestore
import (
"context"
"strings"
"time"
"tailscale.com/ipn"
"tailscale.com/kube"
"tailscale.com/types/logger"
)
// Store is an ipn.StateStore that uses a Kubernetes Secret for persistence.
type Store struct {
client *kube.Client
secretName string
}
// New returns a new Store that persists to the named secret.
func New(_ logger.Logf, secretName string) (*Store, error) {
c, err := kube.New()
if err != nil {
return nil, err
}
return &Store{
client: c,
secretName: secretName,
}, nil
}
func (s *Store) String() string { return "kube.Store" }
// ReadState implements the StateStore interface.
func (s *Store) ReadState(id ipn.StateKey) ([]byte, error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
secret, err := s.client.GetSecret(ctx, s.secretName)
if err != nil {
if st, ok := err.(*kube.Status); ok && st.Code == 404 {
return nil, ipn.ErrStateNotExist
}
return nil, err
}
b, ok := secret.Data[sanitizeKey(id)]
if !ok {
return nil, ipn.ErrStateNotExist
}
return b, nil
}
func sanitizeKey(k ipn.StateKey) string {
// The only valid characters in a Kubernetes secret key are alphanumeric, -,
// _, and .
return strings.Map(func(r rune) rune {
if r >= 'a' && r <= 'z' || r >= 'A' && r <= 'Z' || r >= '0' && r <= '9' || r == '-' || r == '_' || r == '.' {
return r
}
return '_'
}, string(k))
}
// WriteState implements the StateStore interface.
func (s *Store) WriteState(id ipn.StateKey, bs []byte) error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
secret, err := s.client.GetSecret(ctx, s.secretName)
if err != nil {
if st, ok := err.(*kube.Status); ok && st.Code == 404 {
return s.client.CreateSecret(ctx, &kube.Secret{
TypeMeta: kube.TypeMeta{
APIVersion: "v1",
Kind: "Secret",
},
ObjectMeta: kube.ObjectMeta{
Name: s.secretName,
},
Data: map[string][]byte{
sanitizeKey(id): bs,
},
})
}
return err
}
secret.Data[sanitizeKey(id)] = bs
if err := s.client.UpdateSecret(ctx, secret); err != nil {
return err
}
return err
}