mirror of https://github.com/tailscale/tailscale/
ipn/store: add common package for instantiating ipn.StateStores
Also move KubeStore and MemStore into their own package. RELNOTE: tsnet now supports providing a custom ipn.StateStore. Signed-off-by: Maisem Ali <maisem@tailscale.com>pull/4043/head
Maisem Ali
2 years ago
committed by
Maisem Ali
parent
d9a7205be5
commit
497324ddf6
@ -0,0 +1,85 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package kubestore contains an ipn.StateStore implementation using Kubernetes Secrets.
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package kubestore
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import (
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"context"
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"time"
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"tailscale.com/ipn"
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"tailscale.com/kube"
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"tailscale.com/types/logger"
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)
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// Store is an ipn.StateStore that uses a Kubernetes Secret for persistence.
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type Store struct {
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client *kube.Client
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secretName string
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}
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// New returns a new Store that persists to the named secret.
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func New(_ logger.Logf, secretName string) (*Store, error) {
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c, err := kube.New()
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if err != nil {
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return nil, err
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}
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return &Store{
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client: c,
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secretName: secretName,
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}, nil
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}
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func (s *Store) String() string { return "kube.Store" }
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// ReadState implements the StateStore interface.
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func (s *Store) ReadState(id ipn.StateKey) ([]byte, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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secret, err := s.client.GetSecret(ctx, s.secretName)
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if err != nil {
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if st, ok := err.(*kube.Status); ok && st.Code == 404 {
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return nil, ipn.ErrStateNotExist
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}
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return nil, err
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}
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b, ok := secret.Data[string(id)]
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if !ok {
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return nil, ipn.ErrStateNotExist
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}
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return b, nil
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}
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// WriteState implements the StateStore interface.
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func (s *Store) WriteState(id ipn.StateKey, bs []byte) error {
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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secret, err := s.client.GetSecret(ctx, s.secretName)
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if err != nil {
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if st, ok := err.(*kube.Status); ok && st.Code == 404 {
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return s.client.CreateSecret(ctx, &kube.Secret{
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TypeMeta: kube.TypeMeta{
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APIVersion: "v1",
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Kind: "Secret",
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},
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ObjectMeta: kube.ObjectMeta{
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Name: s.secretName,
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},
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Data: map[string][]byte{
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string(id): bs,
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},
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})
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}
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return err
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}
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secret.Data[string(id)] = bs
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if err := s.client.UpdateSecret(ctx, secret); err != nil {
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return err
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}
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return err
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}
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@ -0,0 +1,69 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package mem provides an in-memory ipn.StateStore implementation.
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package mem
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import (
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"encoding/json"
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"sync"
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"tailscale.com/ipn"
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"tailscale.com/types/logger"
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)
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// New returns a new Store.
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func New(logger.Logf, string) (ipn.StateStore, error) {
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return new(Store), nil
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}
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// Store is an ipn.StateStore that keeps state in memory only.
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type Store struct {
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mu sync.Mutex
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cache map[ipn.StateKey][]byte
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}
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func (s *Store) String() string { return "mem.Store" }
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// ReadState implements the StateStore interface.
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func (s *Store) ReadState(id ipn.StateKey) ([]byte, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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bs, ok := s.cache[id]
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if !ok {
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return nil, ipn.ErrStateNotExist
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}
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return bs, nil
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}
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// WriteState implements the StateStore interface.
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func (s *Store) WriteState(id ipn.StateKey, bs []byte) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.cache == nil {
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s.cache = map[ipn.StateKey][]byte{}
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}
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s.cache[id] = append([]byte(nil), bs...)
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return nil
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}
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// LoadFromJSON attempts to unmarshal json content into the
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// in-memory cache.
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func (s *Store) LoadFromJSON(data []byte) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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return json.Unmarshal(data, &s.cache)
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}
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// ExportToJSON exports the content of the cache to
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// JSON formatted []byte.
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func (s *Store) ExportToJSON() ([]byte, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if len(s.cache) == 0 {
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// Avoid "null" serialization.
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return []byte("{}"), nil
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}
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return json.MarshalIndent(s.cache, "", " ")
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}
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@ -0,0 +1,193 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package store provides various implementation of ipn.StateStore.
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package store
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"sync"
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"tailscale.com/atomicfile"
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"tailscale.com/ipn"
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"tailscale.com/ipn/store/mem"
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"tailscale.com/paths"
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"tailscale.com/types/logger"
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)
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// Provider returns a StateStore for the provided path.
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// The arg is of the form "prefix:rest", where prefix was previously registered with Register.
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type Provider func(logf logger.Logf, arg string) (ipn.StateStore, error)
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var regOnce sync.Once
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var registerAvailableExternalStores func()
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func registerDefaultStores() {
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Register("mem:", mem.New)
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if registerAvailableExternalStores != nil {
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registerAvailableExternalStores()
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}
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}
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var knownStores map[string]Provider
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// New returns a StateStore based on the provided arg
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// and registered stores.
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// The arg is of the form "prefix:rest", where prefix was previously
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// registered with Register.
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//
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// By default the following stores are registered:
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//
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// * if the string begins with "mem:", the suffix
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// is ignored and an in-memory store is used.
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// * (Linux-only) if the string begins with "arn:",
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// the suffix an AWS ARN for an SSM.
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// * (Linux-only) if the string begins with "kube:",
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// the suffix is a Kubernetes secret name
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// * In all other cases, the path is treated as a filepath.
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func New(logf logger.Logf, path string) (ipn.StateStore, error) {
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regOnce.Do(registerDefaultStores)
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for prefix, sf := range knownStores {
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if strings.HasPrefix(path, prefix) {
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// We can't strip the prefix here as some NewStoreFunc (like arn:)
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// expect the prefix.
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return sf(logf, path)
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}
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}
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if runtime.GOOS == "windows" {
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path = TryWindowsAppDataMigration(logf, path)
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}
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return NewFileStore(logf, path)
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}
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// Register registers a prefix to be used for
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// NewStore. It panics if the prefix is empty, or if the
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// prefix is already registered.
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// The provided fn is called with the path passed to NewStore;
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// the prefix is not stripped.
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func Register(prefix string, fn Provider) {
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if len(prefix) == 0 {
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panic("prefix is empty")
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}
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if _, ok := knownStores[prefix]; ok {
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panic(fmt.Sprintf("%q already registered", prefix))
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}
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if knownStores == nil {
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knownStores = make(map[string]Provider)
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}
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knownStores[prefix] = fn
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}
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// TryWindowsAppDataMigration attempts to copy the Windows state file
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// from its old location to the new location. (Issue 2856)
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//
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// Tailscale 1.14 and before stored state under %LocalAppData%
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// (usually "C:\WINDOWS\system32\config\systemprofile\AppData\Local"
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// when tailscaled.exe is running as a non-user system service).
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// However it is frequently cleared for almost any reason: Windows
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// updates, System Restore, even various System Cleaner utilities.
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//
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// Returns a string of the path to use for the state file.
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// This will be a fallback %LocalAppData% path if migration fails,
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// a %ProgramData% path otherwise.
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func TryWindowsAppDataMigration(logf logger.Logf, path string) string {
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if path != paths.DefaultTailscaledStateFile() {
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// If they're specifying a non-default path, just trust that they know
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// what they are doing.
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return path
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}
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oldFile := paths.LegacyStateFilePath()
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return paths.TryConfigFileMigration(logf, oldFile, path)
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}
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// FileStore is a StateStore that uses a JSON file for persistence.
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type FileStore struct {
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path string
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mu sync.RWMutex
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cache map[ipn.StateKey][]byte
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}
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// Path returns the path that NewFileStore was called with.
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func (s *FileStore) Path() string { return s.path }
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func (s *FileStore) String() string { return fmt.Sprintf("FileStore(%q)", s.path) }
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// NewFileStore returns a new file store that persists to path.
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func NewFileStore(_ logger.Logf, path string) (ipn.StateStore, error) {
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// We unconditionally call this to ensure that our perms are correct
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if err := paths.MkStateDir(filepath.Dir(path)); err != nil {
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return nil, fmt.Errorf("creating state directory: %w", err)
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}
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bs, err := ioutil.ReadFile(path)
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// Treat an empty file as a missing file.
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// (https://github.com/tailscale/tailscale/issues/895#issuecomment-723255589)
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if err == nil && len(bs) == 0 {
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log.Printf("ipn.NewFileStore(%q): file empty; treating it like a missing file [warning]", path)
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err = os.ErrNotExist
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}
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if err != nil {
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if os.IsNotExist(err) {
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// Write out an initial file, to verify that we can write
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// to the path.
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if err = atomicfile.WriteFile(path, []byte("{}"), 0600); err != nil {
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return nil, err
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}
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return &FileStore{
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path: path,
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cache: map[ipn.StateKey][]byte{},
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}, nil
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}
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return nil, err
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}
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ret := &FileStore{
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path: path,
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cache: map[ipn.StateKey][]byte{},
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}
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if err := json.Unmarshal(bs, &ret.cache); err != nil {
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return nil, err
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}
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return ret, nil
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}
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// ReadState implements the StateStore interface.
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func (s *FileStore) ReadState(id ipn.StateKey) ([]byte, error) {
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s.mu.RLock()
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defer s.mu.RUnlock()
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bs, ok := s.cache[id]
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if !ok {
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return nil, ipn.ErrStateNotExist
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}
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return bs, nil
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}
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// WriteState implements the StateStore interface.
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func (s *FileStore) WriteState(id ipn.StateKey, bs []byte) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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if bytes.Equal(s.cache[id], bs) {
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return nil
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}
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s.cache[id] = append([]byte(nil), bs...)
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bs, err := json.MarshalIndent(s.cache, "", " ")
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if err != nil {
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return err
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}
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return atomicfile.WriteFile(s.path, bs, 0600)
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}
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@ -0,0 +1,26 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package store
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import (
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"strings"
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"tailscale.com/ipn"
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"tailscale.com/ipn/store/awsstore"
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"tailscale.com/ipn/store/kubestore"
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"tailscale.com/types/logger"
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)
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func init() {
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registerAvailableExternalStores = registerExternalStores
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}
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func registerExternalStores() {
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Register("kube:", func(logf logger.Logf, path string) (ipn.StateStore, error) {
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secretName := strings.TrimPrefix(path, "kube:")
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return kubestore.New(logf, secretName)
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})
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Register("arn:", awsstore.New)
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}
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@ -0,0 +1,191 @@
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// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package store
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import (
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"os"
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"path/filepath"
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"testing"
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"tailscale.com/ipn"
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"tailscale.com/ipn/store/mem"
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"tailscale.com/tstest"
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"tailscale.com/types/logger"
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)
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func TestNewStore(t *testing.T) {
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regOnce.Do(registerDefaultStores)
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t.Cleanup(func() {
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knownStores = map[string]Provider{}
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registerDefaultStores()
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})
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knownStores = map[string]Provider{}
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type store1 struct {
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ipn.StateStore
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path string
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}
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type store2 struct {
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ipn.StateStore
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path string
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}
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Register("arn:", func(_ logger.Logf, path string) (ipn.StateStore, error) {
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return &store1{new(mem.Store), path}, nil
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})
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Register("kube:", func(_ logger.Logf, path string) (ipn.StateStore, error) {
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return &store2{new(mem.Store), path}, nil
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})
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Register("mem:", func(_ logger.Logf, path string) (ipn.StateStore, error) {
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return new(mem.Store), nil
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})
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path := "mem:abcd"
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if s, err := New(t.Logf, path); err != nil {
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t.Fatalf("%q: %v", path, err)
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} else if _, ok := s.(*mem.Store); !ok {
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t.Fatalf("%q: got: %T, want: %T", path, s, new(mem.Store))
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}
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path = "arn:foo"
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if s, err := New(t.Logf, path); err != nil {
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t.Fatalf("%q: %v", path, err)
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} else if _, ok := s.(*store1); !ok {
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t.Fatalf("%q: got: %T, want: %T", path, s, new(store1))
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}
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path = "kube:abcd"
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if s, err := New(t.Logf, path); err != nil {
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t.Fatalf("%q: %v", path, err)
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} else if _, ok := s.(*store2); !ok {
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t.Fatalf("%q: got: %T, want: %T", path, s, new(store2))
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}
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f, err := os.CreateTemp("", "")
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if err != nil {
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t.Fatal(err)
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}
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if err := f.Close(); err != nil {
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t.Fatal(err)
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}
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t.Cleanup(func() {
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os.Remove(f.Name())
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})
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path = f.Name()
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if s, err := New(t.Logf, path); err != nil {
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t.Fatalf("%q: %v", path, err)
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} else if _, ok := s.(*FileStore); !ok {
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t.Fatalf("%q: got: %T, want: %T", path, s, new(FileStore))
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}
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}
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func testStoreSemantics(t *testing.T, store ipn.StateStore) {
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t.Helper()
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tests := []struct {
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// if true, data is data to write. If false, data is expected
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// output of read.
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write bool
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id ipn.StateKey
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data string
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// If write=false, true if we expect a not-exist error.
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notExists bool
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}{
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{
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id: "foo",
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notExists: true,
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},
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{
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write: true,
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id: "foo",
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data: "bar",
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},
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{
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id: "foo",
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data: "bar",
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},
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{
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id: "baz",
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notExists: true,
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},
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{
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write: true,
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id: "baz",
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data: "quux",
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},
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{
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id: "foo",
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data: "bar",
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},
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{
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||||
id: "baz",
|
||||
data: "quux",
|
||||
},
|
||||
}
|
||||
|
||||
for _, test := range tests {
|
||||
if test.write {
|
||||
if err := store.WriteState(test.id, []byte(test.data)); err != nil {
|
||||
t.Errorf("writing %q to %q: %v", test.data, test.id, err)
|
||||
}
|
||||
} else {
|
||||
bs, err := store.ReadState(test.id)
|
||||
if err != nil {
|
||||
if test.notExists && err == ipn.ErrStateNotExist {
|
||||
continue
|
||||
}
|
||||
t.Errorf("reading %q: %v", test.id, err)
|
||||
continue
|
||||
}
|
||||
if string(bs) != test.data {
|
||||
t.Errorf("reading %q: got %q, want %q", test.id, string(bs), test.data)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestMemoryStore(t *testing.T) {
|
||||
tstest.PanicOnLog()
|
||||
|
||||
store := new(mem.Store)
|
||||
testStoreSemantics(t, store)
|
||||
}
|
||||
|
||||
func TestFileStore(t *testing.T) {
|
||||
tstest.PanicOnLog()
|
||||
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "test-file-store.conf")
|
||||
|
||||
store, err := NewFileStore(nil, path)
|
||||
if err != nil {
|
||||
t.Fatalf("creating file store failed: %v", err)
|
||||
}
|
||||
|
||||
testStoreSemantics(t, store)
|
||||
|
||||
// Build a brand new file store and check that both IDs written
|
||||
// above are still there.
|
||||
store, err = NewFileStore(nil, path)
|
||||
if err != nil {
|
||||
t.Fatalf("creating second file store failed: %v", err)
|
||||
}
|
||||
|
||||
expected := map[ipn.StateKey]string{
|
||||
"foo": "bar",
|
||||
"baz": "quux",
|
||||
}
|
||||
for key, want := range expected {
|
||||
bs, err := store.ReadState(key)
|
||||
if err != nil {
|
||||
t.Errorf("reading %q (2nd store): %v", key, err)
|
||||
continue
|
||||
}
|
||||
if string(bs) != want {
|
||||
t.Errorf("reading %q (2nd store): got %q, want %q", key, bs, want)
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,120 +0,0 @@
|
||||
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package ipn
|
||||
|
||||
import (
|
||||
"path/filepath"
|
||||
"testing"
|
||||
|
||||
"tailscale.com/tstest"
|
||||
)
|
||||
|
||||
func testStoreSemantics(t *testing.T, store StateStore) {
|
||||
t.Helper()
|
||||
|
||||
tests := []struct {
|
||||
// if true, data is data to write. If false, data is expected
|
||||
// output of read.
|
||||
write bool
|
||||
id StateKey
|
||||
data string
|
||||
// If write=false, true if we expect a not-exist error.
|
||||
notExists bool
|
||||
}{
|
||||
{
|
||||
id: "foo",
|
||||
notExists: true,
|
||||
},
|
||||
{
|
||||
write: true,
|
||||
id: "foo",
|
||||
data: "bar",
|
||||
},
|
||||
{
|
||||
id: "foo",
|
||||
data: "bar",
|
||||
},
|
||||
{
|
||||
id: "baz",
|
||||
notExists: true,
|
||||
},
|
||||
{
|
||||
write: true,
|
||||
id: "baz",
|
||||
data: "quux",
|
||||
},
|
||||
{
|
||||
id: "foo",
|
||||
data: "bar",
|
||||
},
|
||||
{
|
||||
id: "baz",
|
||||
data: "quux",
|
||||
},
|
||||
}
|
||||
|
||||
for _, test := range tests {
|
||||
if test.write {
|
||||
if err := store.WriteState(test.id, []byte(test.data)); err != nil {
|
||||
t.Errorf("writing %q to %q: %v", test.data, test.id, err)
|
||||
}
|
||||
} else {
|
||||
bs, err := store.ReadState(test.id)
|
||||
if err != nil {
|
||||
if test.notExists && err == ErrStateNotExist {
|
||||
continue
|
||||
}
|
||||
t.Errorf("reading %q: %v", test.id, err)
|
||||
continue
|
||||
}
|
||||
if string(bs) != test.data {
|
||||
t.Errorf("reading %q: got %q, want %q", test.id, string(bs), test.data)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestMemoryStore(t *testing.T) {
|
||||
tstest.PanicOnLog()
|
||||
|
||||
store := &MemoryStore{}
|
||||
testStoreSemantics(t, store)
|
||||
}
|
||||
|
||||
func TestFileStore(t *testing.T) {
|
||||
tstest.PanicOnLog()
|
||||
|
||||
dir := t.TempDir()
|
||||
path := filepath.Join(dir, "test-file-store.conf")
|
||||
|
||||
store, err := NewFileStore(path)
|
||||
if err != nil {
|
||||
t.Fatalf("creating file store failed: %v", err)
|
||||
}
|
||||
|
||||
testStoreSemantics(t, store)
|
||||
|
||||
// Build a brand new file store and check that both IDs written
|
||||
// above are still there.
|
||||
store, err = NewFileStore(path)
|
||||
if err != nil {
|
||||
t.Fatalf("creating second file store failed: %v", err)
|
||||
}
|
||||
|
||||
expected := map[StateKey]string{
|
||||
"foo": "bar",
|
||||
"baz": "quux",
|
||||
}
|
||||
for key, want := range expected {
|
||||
bs, err := store.ReadState(key)
|
||||
if err != nil {
|
||||
t.Errorf("reading %q (2nd store): %v", key, err)
|
||||
continue
|
||||
}
|
||||
if string(bs) != want {
|
||||
t.Errorf("reading %q (2nd store): got %q, want %q", key, bs, want)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue