feat: add store for access token cache

config.go

@@ -2,6 +2,8 @@ package memogram
 
 import (
 	"os"
+	"path"
+
 	"github.com/caarlos0/env"
 	"github.com/joho/godotenv"
 	"github.com/pkg/errors"
@@ -10,6 +12,7 @@ import (
 type Config struct {
 	ServerAddr string `env:"SERVER_ADDR,required"`
 	BotToken   string `env:"BOT_TOKEN,required"`
+	Data       string `env:"DATA"`
 }
 
 func getConfigFromEnv() (*Config, error) {
@@ -25,5 +28,10 @@ func getConfigFromEnv() (*Config, error) {
 	if err := env.Parse(&config); err != nil {
 		return nil, errors.Wrap(err, "invalid configuration")
 	}
+	if config.Data == "" {
+		// Default to `data.txt` if not specified.
+		config.Data = "data.txt"
+	}
+	config.Data = path.Join(".", config.Data)
 	return &config, nil
 }

memogram.go

@@ -8,11 +8,11 @@ import (
 	"net/http"
 	"path/filepath"
 	"strings"
-	"sync"
 
 	"github.com/go-telegram/bot"
 	"github.com/go-telegram/bot/models"
 	"github.com/pkg/errors"
+	"github.com/usememos/memogram/store"
 	v1pb "github.com/usememos/memos/proto/gen/api/v1"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
@@ -20,16 +20,11 @@ import (
 	fieldmaskpb "google.golang.org/protobuf/types/known/fieldmaskpb"
 )
 
-// userAccessTokenCache is a cache for user access token.
-// Key is the user id from telegram.
-// Value is the access token from memos.
-// TODO: save it to a persistent storage.
-var userAccessTokenCache sync.Map // map[int64]string
-
 type Service struct {
-	config *Config
-	client *MemosClient
 	bot    *bot.Bot
+	client *MemosClient
+	config *Config
+	store  *store.Store
 }
 
 func NewService() (*Service, error) {
@@ -38,16 +33,21 @@ func NewService() (*Service, error) {
 		return nil, errors.Wrap(err, "failed to get config from env")
 	}
 
-	conn, err := grpc.Dial(config.ServerAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	conn, err := grpc.NewClient(config.ServerAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
 		slog.Error("failed to connect to server", slog.Any("err", err))
 		return nil, errors.Wrap(err, "failed to connect to server")
 	}
 	client := NewMemosClient(conn)
 
+	store := store.NewStore(config.Data)
+	if err := store.Init(); err != nil {
+		return nil, errors.Wrap(err, "failed to init store")
+	}
 	s := &Service{
 		config: config,
 		client: client,
+		store:  store,
 	}
 
 	opts := []bot.Option{
@@ -86,7 +86,7 @@ func (s *Service) handler(ctx context.Context, b *bot.Bot, m *models.Update) {
 	}
 
 	userID := m.Message.From.ID
-	if _, ok := userAccessTokenCache.Load(userID); !ok {
+	if _, ok := s.store.GetUserAccessToken(userID); !ok {
 		b.SendMessage(ctx, &bot.SendMessageParams{
 			ChatID: m.Message.Chat.ID,
 			Text:   "Please start the bot with /start <access_token>",
@@ -147,8 +147,8 @@ func (s *Service) handler(ctx context.Context, b *bot.Bot, m *models.Update) {
 		return
 	}
 
-	accessToken, _ := userAccessTokenCache.Load(userID)
-	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken.(string))))
+	accessToken, _ := s.store.GetUserAccessToken(userID)
+	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken)))
 	memo, err := s.client.MemoService.CreateMemo(ctx, &v1pb.CreateMemoRequest{
 		Content: content,
 	})
@@ -164,15 +164,12 @@ func (s *Service) handler(ctx context.Context, b *bot.Bot, m *models.Update) {
 	if message.Document != nil {
 		s.processFileMessage(ctx, b, m, message.Document.FileID, memo)
 	}
-
 	if message.Voice != nil {
 		s.processFileMessage(ctx, b, m, message.Voice.FileID, memo)
 	}
-
 	if message.Video != nil {
 		s.processFileMessage(ctx, b, m, message.Video.FileID, memo)
 	}
-
 	if len(message.Photo) > 0 {
 		photo := message.Photo[len(message.Photo)-1]
 		s.processFileMessage(ctx, b, m, photo.FileID, memo)
@@ -204,7 +201,7 @@ func (s *Service) startHandler(ctx context.Context, b *bot.Bot, m *models.Update
 		return
 	}
 
-	userAccessTokenCache.Store(userID, accessToken)
+	s.store.SetUserAccessToken(userID, accessToken)
 	b.SendMessage(ctx, &bot.SendMessageParams{
 		ChatID: m.Message.Chat.ID,
 		Text:   fmt.Sprintf("Hello %s!", user.Nickname),
@@ -214,29 +211,29 @@ func (s *Service) startHandler(ctx context.Context, b *bot.Bot, m *models.Update
 func (s *Service) keyboard(memo *v1pb.Memo) *models.InlineKeyboardMarkup {
 	// add inline keyboard to edit memo's visibility or pinned status.
 	return &models.InlineKeyboardMarkup{
-			InlineKeyboard: [][]models.InlineKeyboardButton{
+		InlineKeyboard: [][]models.InlineKeyboardButton{
+			{
 				{
-					{
-						Text: "Public",
-						CallbackData:  fmt.Sprintf("public %s",  memo.Name),
-					},
-					{
-						Text: "Private",
-						CallbackData:  fmt.Sprintf("private %s",  memo.Name),
-					},
-					{
-						Text: "Pin",
-						CallbackData:  fmt.Sprintf("pin %s",  memo.Name),
-					},
+					Text:         "Public",
+					CallbackData: fmt.Sprintf("public %s", memo.Name),
+				},
+				{
+					Text:         "Private",
+					CallbackData: fmt.Sprintf("private %s", memo.Name),
+				},
+				{
+					Text:         "Pin",
+					CallbackData: fmt.Sprintf("pin %s", memo.Name),
 				},
 			},
-		}
+		},
+	}
 }
 
 func (s *Service) callbackQueryHandler(ctx context.Context, b *bot.Bot, update *models.Update) {
 	callbackData := update.CallbackQuery.Data
 	userID := update.CallbackQuery.From.ID
-	accessToken, ok := userAccessTokenCache.Load(userID)
+	accessToken, ok := s.store.GetUserAccessToken(userID)
 	if !ok {
 		b.AnswerCallbackQuery(ctx, &bot.AnswerCallbackQueryParams{
 			CallbackQueryID: update.CallbackQuery.ID,
@@ -246,7 +243,7 @@ func (s *Service) callbackQueryHandler(ctx context.Context, b *bot.Bot, update *
 		return
 	}
 
-	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken.(string))))
+	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken)))
 
 	parts := strings.Split(callbackData, " ")
 	if len(parts) != 2 {
@@ -313,10 +310,10 @@ func (s *Service) callbackQueryHandler(ctx context.Context, b *bot.Bot, update *
 		pinnedMarker = ""
 	}
 	b.EditMessageText(ctx, &bot.EditMessageTextParams{
-		ChatID:    update.CallbackQuery.Message.Message.Chat.ID,
-		MessageID: update.CallbackQuery.Message.Message.ID,
-		Text:      fmt.Sprintf("Memo updated as %s with [%s](%s/m/%s) %s", v1pb.Visibility_name[int32(memo.Visibility)], memo.Name, s.config.ServerAddr, memo.Uid, pinnedMarker),
-		ParseMode: models.ParseModeMarkdown,
+		ChatID:      update.CallbackQuery.Message.Message.Chat.ID,
+		MessageID:   update.CallbackQuery.Message.Message.ID,
+		Text:        fmt.Sprintf("Memo updated as %s with [%s](%s/m/%s) %s", v1pb.Visibility_name[int32(memo.Visibility)], memo.Name, s.config.ServerAddr, memo.Uid, pinnedMarker),
+		ParseMode:   models.ParseModeMarkdown,
 		ReplyMarkup: s.keyboard(memo),
 	})
 
@@ -332,8 +329,8 @@ func (s *Service) searchHandler(ctx context.Context, b *bot.Bot, m *models.Updat
 
 	filterString := "content_search == ['" + searchString + "']"
 
-	accessToken, _ := userAccessTokenCache.Load(userID)
-	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken.(string))))
+	accessToken, _ := s.store.GetUserAccessToken(userID)
+	ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("Authorization", fmt.Sprintf("Bearer %s", accessToken)))
 	results, err := s.client.MemoService.ListMemos(ctx, &v1pb.ListMemosRequest{
 		PageSize: 10,
 		Filter:   filterString,
@@ -360,8 +357,20 @@ func (s *Service) searchHandler(ctx context.Context, b *bot.Bot, m *models.Updat
 			})
 		}
 	}
+}
 
-	return
+func (s *Service) processFileMessage(ctx context.Context, b *bot.Bot, m *models.Update, fileID string, memo *v1pb.Memo) {
+	file, err := b.GetFile(ctx, &bot.GetFileParams{FileID: fileID})
+	if err != nil {
+		s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to get file"))
+		return
+	}
+
+	_, err = s.saveResourceFromFile(ctx, file, memo)
+	if err != nil {
+		s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to save resource"))
+		return
+	}
 }
 
 func (s *Service) saveResourceFromFile(ctx context.Context, file *models.File, memo *v1pb.Memo) (*v1pb.Resource, error) {
@@ -397,20 +406,6 @@ func (s *Service) saveResourceFromFile(ctx context.Context, file *models.File, m
 	return resource, nil
 }
 
-func (s *Service) processFileMessage(ctx context.Context, b *bot.Bot, m *models.Update, fileID string, memo *v1pb.Memo) {
-	file, err := b.GetFile(ctx, &bot.GetFileParams{FileID: fileID})
-	if err != nil {
-		s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to get file"))
-		return
-	}
-
-	_, err = s.saveResourceFromFile(ctx, file, memo)
-	if err != nil {
-		s.sendError(b, m.Message.Chat.ID, errors.Wrap(err, "failed to save resource"))
-		return
-	}
-}
-
 func (s *Service) sendError(b *bot.Bot, chatID int64, err error) {
 	slog.Error("error", slog.Any("err", err))
 	b.SendMessage(context.Background(), &bot.SendMessageParams{

store/store.go

@@ -0,0 +1,29 @@
+package store
+
+import (
+	"sync"
+
+	"github.com/pkg/errors"
+)
+
+type Store struct {
+	Data string
+
+	userAccessTokenCache sync.Map // map[int64]string
+}
+
+func NewStore(data string) *Store {
+	return &Store{
+		Data: data,
+
+		userAccessTokenCache: sync.Map{},
+	}
+}
+
+func (s *Store) Init() error {
+	if err := s.loadUserAccessTokenMapFromFile(); err != nil {
+		return errors.Wrap(err, "failed to load user access token map from file")
+	}
+
+	return nil
+}

store/user.go

@@ -0,0 +1,100 @@
+package store
+
+import (
+	"bufio"
+	"log/slog"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// GetUserAccessToken returns the access token for the user.
+func (s *Store) GetUserAccessToken(userID int64) (string, bool) {
+	accessToken, ok := s.userAccessTokenCache.Load(userID)
+	if !ok {
+		return "", false
+	}
+	return accessToken.(string), true
+}
+
+// SetUserAccessToken sets the access token for the user.
+func (s *Store) SetUserAccessToken(userID int64, accessToken string) {
+	s.userAccessTokenCache.Store(userID, accessToken)
+	if err := s.SaveUserAccessTokenMapToFile(); err != nil {
+		slog.Error("failed to save user access token map to file", "error", err)
+	}
+}
+
+// SaveUserAccessTokenMapToFile saves the user access token map to a data file.
+func (s *Store) SaveUserAccessTokenMapToFile() error {
+	// Open the file for writing
+	file, err := os.OpenFile(s.Data, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// Iterate over the user access token map and write each entry to the file
+	s.userAccessTokenCache.Range(func(key, value interface{}) bool {
+		userID := key.(int64)
+		accessToken := value.(string)
+		line := strconv.FormatInt(userID, 10) + ":" + accessToken + "\n"
+		_, err := file.WriteString(line)
+		if err != nil {
+			return false
+		}
+		return true
+	})
+
+	return nil
+}
+
+func (s *Store) loadUserAccessTokenMapFromFile() error {
+	// Check if the file exists
+	if _, err := os.Stat(s.Data); os.IsNotExist(err) {
+		// Create the file if it doesn't exist
+		file, err := os.Create(s.Data)
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+	}
+
+	// Open the file
+	file, err := os.Open(s.Data)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// Read the file line by line
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		// Parse the line and extract the user ID and access token
+		userID, accessToken := parseLine(line)
+		if userID == 0 || accessToken == "" {
+			continue
+		}
+		// Store the user ID and access token in the cache
+		s.userAccessTokenCache.Store(userID, accessToken)
+	}
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func parseLine(line string) (int64, string) {
+	parts := strings.Split(line, ":")
+	if len(parts) != 2 {
+		return 0, ""
+	}
+	userIDStr := parts[0]
+	accessToken := parts[1]
+	userID, err := strconv.ParseInt(userIDStr, 10, 64)
+	if err != nil {
+		return 0, ""
+	}
+	return userID, accessToken
+}