optimize #148 lazy initial gorm db in first use

internal/conf/conf.go

@@ -7,7 +7,7 @@ import (
 )
 
 var (
-	LoggerSetting      *LoggerSettingS
+	loggerSetting      *LoggerSettingS
 	loggerFileSetting  *LoggerFileSettingS
 	loggerZincSetting  *LoggerZincSettingS
 	loggerMeiliSetting *LoggerMeiliSettingS
@@ -57,7 +57,7 @@ func setupSetting(suite []string, noDefault bool) error {
 		"BigCacheIndex":    &BigCacheIndexSetting,
 		"Alipay":           &AlipaySetting,
 		"SmsJuhe":          &SmsJuheSetting,
-		"Logger":           &LoggerSetting,
+		"Logger":           &loggerSetting,
 		"LoggerFile":       &loggerFileSetting,
 		"LoggerZinc":       &loggerZincSetting,
 		"LoggerMeili":      &loggerMeiliSetting,
@@ -97,11 +97,7 @@ func Initialize(suite []string, noDefault bool) {
 	}
 
 	setupLogger()
-
-	err = setupDBEngine()
-	if err != nil {
-		log.Fatalf("init.setupDBEngine err: %v", err)
-	}
+	setupDBEngine()
 }
 
 // Cfg get value by key if exist

internal/conf/db.go

@@ -1,6 +1,7 @@
 package conf
 
 import (
+	"sync"
 	"time"
 
 	"github.com/go-redis/redis/v8"
@@ -15,10 +16,21 @@ import (
 )
 
 var (
-	DBEngine *gorm.DB
+	db    *gorm.DB
 	Redis *redis.Client
+	once  sync.Once
 )
 
+func MustGormDB() *gorm.DB {
+	once.Do(func() {
+		var err error
+		if db, err = newDBEngine(); err != nil {
+			logrus.Fatalf("new gorm db failed: %s", err)
+		}
+	})
+	return db
+}
+
 func newDBEngine() (*gorm.DB, error) {
 	newLogger := logger.New(
 		logrus.StandardLogger(), // io writer（日志输出的目标，前缀和日志包含的内容）
@@ -69,19 +81,10 @@ func newDBEngine() (*gorm.DB, error) {
 	return db, err
 }
 
-// setupDBEngine 暂时只支持MySQL
-func setupDBEngine() error {
-	var err error
-	DBEngine, err = newDBEngine()
-	if err != nil {
-		return err
-	}
-
+func setupDBEngine() {
 	Redis = redis.NewClient(&redis.Options{
 		Addr:     redisSetting.Host,
 		Password: redisSetting.Password,
 		DB:       redisSetting.DB,
 	})
-
-	return nil
 }

internal/conf/logger.go

@@ -18,7 +18,7 @@ func newFileLogger() io.Writer {
 
 func setupLogger() {
 	logrus.SetFormatter(&logrus.JSONFormatter{})
-	logrus.SetLevel(LoggerSetting.logLevel())
+	logrus.SetLevel(loggerSetting.logLevel())
 
 	if CfgIf("LoggerFile") {
 		out := newFileLogger()

internal/dao/jinzhu/jinzhu.go

@@ -39,7 +39,7 @@ func NewDataService() (core.DataService, core.VersionInfo) {
 		c core.CacheIndexService
 		v core.VersionInfo
 	)
-	db := conf.DBEngine
+	db := conf.MustGormDB()
 
 	i := newIndexPostsService(db)
 	if conf.CfgIf("SimpleCacheIndex") {
@@ -71,7 +71,7 @@ func NewDataService() (core.DataService, core.VersionInfo) {
 
 func NewAuthorizationManageService() core.AuthorizationManageService {
 	return &authorizationManageServant{
-		db: conf.DBEngine,
+		db: conf.MustGormDB(),
 	}
 }
 

internal/middleware/jwt.go

@@ -12,6 +12,8 @@ import (
 )
 
 func JWT() gin.HandlerFunc {
+	// TODO: optimize get user from a simple service that provide fetch a user info interface.
+	db := conf.MustGormDB()
 	return func(c *gin.Context) {
 		var (
 			token string
@@ -54,7 +56,7 @@ func JWT() gin.HandlerFunc {
 						ID: claims.UID,
 					},
 				}
-				user, _ = user.Get(conf.DBEngine)
+				user, _ = user.Get(db)
 				c.Set("USER", user)
 
 				// 强制下线机制
@@ -76,6 +78,8 @@ func JWT() gin.HandlerFunc {
 }
 
 func JwtLoose() gin.HandlerFunc {
+	// TODO: optimize get user from a simple service that provide fetch a user info interface.
+	db := conf.MustGormDB()
 	return func(c *gin.Context) {
 		token, exist := c.GetQuery("token")
 		if !exist {
@@ -98,7 +102,7 @@ func JwtLoose() gin.HandlerFunc {
 						ID: claims.UID,
 					},
 				}
-				user, err := user.Get(conf.DBEngine)
+				user, err := user.Get(db)
 				if err == nil && (conf.JWTSetting.Issuer+":"+user.Salt) == claims.Issuer {
 					c.Set("USER", user)
 				}

main.go

@@ -16,8 +16,6 @@ import (
 )
 
 var (
-	version, commitID, buildDate string
-
 	noDefaultFeatures bool
 	features          suites
 )