国际象棋 (#720)

* init commit for chess

* fix lint & error

* remove issue link

* fix lint

* remove embed

* regex fix

* use strings.Builder

* 改不动了，先 push 了备份下

* 基本上改好了

* limit

* 使用等宽字体渲染棋盘

* use syncx

* 不会更新依赖库😭

* 先 push 备份下

* 更新依赖版本，确保能读取到字体文件

* fix log

plugin/chess/db.go

@@ -0,0 +1,100 @@
+package chess
+
+import (
+	"os"
+
+	"github.com/jinzhu/gorm"
+)
+
+var chessDB *gorm.DB
+
+// elo user elo info
+type elo struct {
+	gorm.Model
+	Uin  int64 `gorm:"unique_index"`
+	Name string
+	Rate int
+}
+
+// pgn chess pgn info
+type pgn struct {
+	gorm.Model
+	Data      string
+	WhiteUin  int64
+	BlackUin  int64
+	WhiteName string
+	BlackName string
+}
+
+// chessDBService 数据库服务
+type chessDBService struct {
+	db *gorm.DB
+}
+
+// newDBService 创建数据库服务
+func newDBService() *chessDBService {
+	return &chessDBService{
+		db: chessDB,
+	}
+}
+
+// initDatabase init database
+func initDatabase(dbPath string) {
+	var err error
+	if _, err = os.Stat(dbPath); err != nil || os.IsNotExist(err) {
+		f, err := os.Create(dbPath)
+		if err != nil {
+			panic(err)
+		}
+		defer f.Close()
+	}
+	chessDB, err = gorm.Open("sqlite3", dbPath)
+	if err != nil {
+		panic(err)
+	}
+	chessDB.AutoMigrate(&elo{}, &pgn{})
+}
+
+// createELO 创建 ELO
+func (s *chessDBService) createELO(uin int64, name string, rate int) error {
+	return s.db.Create(&elo{
+		Uin:  uin,
+		Name: name,
+		Rate: rate,
+	}).Error
+}
+
+// getELORateByUin 获取 ELO 等级分
+func (s *chessDBService) getELORateByUin(uin int64) (int, error) {
+	var elo elo
+	err := s.db.Select("rate").Where("uin = ?", uin).First(&elo).Error
+	return elo.Rate, err
+}
+
+// getHighestRateList 获取最高的等级分列表
+func (s *chessDBService) getHighestRateList() ([]elo, error) {
+	var eloList []elo
+	err := s.db.Order("rate desc").Limit(10).Find(&eloList).Error
+	return eloList, err
+}
+
+// updateELOByUin 更新 ELO 等级分
+func (s *chessDBService) updateELOByUin(uin int64, name string, rate int) error {
+	return s.db.Model(&elo{}).Where("uin = ?", uin).Update("name", name).Update("rate", rate).Error
+}
+
+// cleanELOByUin 清空用户 ELO 等级分
+func (s *chessDBService) cleanELOByUin(uin int64) error {
+	return s.db.Model(&elo{}).Where("uin = ?", uin).Update("rate", 100).Error
+}
+
+// createPGN 创建 PGN
+func (s *chessDBService) createPGN(data string, whiteUin int64, blackUin int64, whiteName string, blackName string) error {
+	return s.db.Create(&pgn{
+		Data:      data,
+		WhiteUin:  whiteUin,
+		BlackUin:  blackUin,
+		WhiteName: whiteName,
+		BlackName: blackName,
+	}).Error
+}