fix friend bug

internal/rpc/friend/friend.go

@@ -157,14 +157,35 @@ func (s *friendServer) AddFriend(ctx context.Context, req *pbFriend.AddFriendReq
 			ErrMsg:  callbackResp.ErrMsg,
 		}}, nil
 	}
+	var isSend = true
+	userIDList, err := rocksCache.GetFriendIDListFromCache(req.CommID.ToUserID)
+	if err != nil {
+		log.NewError(req.CommID.OperationID, "GetFriendIDListFromCache failed ", err.Error(), req.CommID.ToUserID)
+		return &pbFriend.AddFriendResp{CommonResp: &pbFriend.CommonResp{ErrCode: constant.ErrDB.ErrCode, ErrMsg: err.Error()}}, nil
+	}
+	userIDList2, err := rocksCache.GetFriendIDListFromCache(req.CommID.FromUserID)
+	if err != nil {
+		log.NewError(req.CommID.OperationID, "GetUserByUserID failed ", err.Error(), req.CommID.FromUserID)
+		return &pbFriend.AddFriendResp{CommonResp: &pbFriend.CommonResp{ErrCode: constant.ErrDB.ErrCode, ErrMsg: err.Error()}}, nil
+	}
+
+	for _, v := range userIDList {
+		if v == req.CommID.FromUserID {
+			for _, v2 := range userIDList2 {
+				if v2 == req.CommID.ToUserID {
+					isSend = false
+				}
+			}
+		}
+	}
 
 	//Cannot add non-existent users
+
+	if isSend {
 		if _, err := imdb.GetUserByUserID(req.CommID.ToUserID); err != nil {
 			log.NewError(req.CommID.OperationID, "GetUserByUserID failed ", err.Error(), req.CommID.ToUserID)
 			return &pbFriend.AddFriendResp{CommonResp: &pbFriend.CommonResp{ErrCode: constant.ErrDB.ErrCode, ErrMsg: constant.ErrDB.ErrMsg}}, nil
 		}
-
-	//Establish a latest relationship in the friend request table
 		friendRequest := db.FriendRequest{
 			HandleResult: 0, ReqMsg: req.ReqMsg, CreateTime: time.Now()}
 		utils.CopyStructFields(&friendRequest, req.CommID)
@@ -180,6 +201,9 @@ func (s *friendServer) AddFriend(ctx context.Context, req *pbFriend.AddFriendReq
 		}
 
 		chat.FriendApplicationNotification(req)
+	}
+	//Establish a latest relationship in the friend request table
+
 	return &pbFriend.AddFriendResp{CommonResp: &pbFriend.CommonResp{}}, nil
 }