update supported chats cache

dao/db.go

@@ -3,6 +3,8 @@ package dao
 import (
 	"fmt"
 	dbModel "sdk_api/model/db"
+	"sync"
+	"time"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -59,7 +61,19 @@ func (d *Dao) UserLeft(userId, chatId int) (err error) {
 		Update("left_at", gorm.Expr("NOW()")).Error
 }
 
+var (
+	supportedChatsCache     = map[int]time.Time{}
+	supportedChatsCacheLock = sync.RWMutex{}
+)
+
 func (d *Dao) IsSupportedChat(chatId int) (exist bool, err error) {
+	supportedChatsCacheLock.RLock()
+	expired, ok := supportedChatsCache[chatId]
+	supportedChatsCacheLock.RUnlock()
+	if ok && expired.After(time.Now()) {
+		return true, nil
+	}
+
 	a := dbModel.ChatGroup{}
 	err = d.db.Model(&dbModel.ChatGroup{}).
 		Where("chat_id = ?", chatId).
@@ -67,7 +81,15 @@ func (d *Dao) IsSupportedChat(chatId int) (exist bool, err error) {
 	if err == gorm.ErrRecordNotFound {
 		return false, nil
 	}
-	return err == nil, err
+
+	if err != nil {
+		return false, err
+	}
+
+	supportedChatsCacheLock.Lock()
+	supportedChatsCache[chatId] = time.Now().Add(1 * time.Hour)
+	supportedChatsCacheLock.Unlock()
+	return true, err
 }
 
 func (d *Dao) addTestGroup() (err error) {