(feat) support max connection setting for database configuration

conf/defaults.ini

@@ -73,6 +73,11 @@ password =
 # Example: mysql://user:secret@host:port/database
 url =
 
+# Max conn setting default is 0 (mean not set)
+max_conn =
+max_idle_conn =
+max_open_conn =
+
 # For "postgres", use either "disable", "require" or "verify-full"
 # For "mysql", use either "true", "false", or "skip-verify".
 ssl_mode = disable

pkg/services/sqlstore/sqlstore.go

@@ -29,6 +29,9 @@ type DatabaseConfig struct {
 	ClientKeyPath                              string
 	ClientCertPath                             string
 	ServerCertName                             string
+	MaxConn                                    int
+	MaxOpenConn                                int
+	MaxIdleConn                                int
 }
 
 var (
@@ -150,7 +153,15 @@ func getEngine() (*xorm.Engine, error) {
 	}
 
 	sqlog.Info("Initializing DB", "dbtype", DbCfg.Type)
-	return xorm.NewEngine(DbCfg.Type, cnnstr)
+	engine, err := xorm.NewEngine(DbCfg.Type, cnnstr)
+	if err != nil {
+		return nil, err
+	} else {
+		engine.SetMaxConns(DbCfg.MaxConn)
+		engine.SetMaxOpenConns(DbCfg.MaxOpenConn)
+		engine.SetMaxIdleConns(DbCfg.MaxIdleConn)
+	}
+	return engine, nil
 }
 
 func LoadConfig() {
@@ -177,6 +188,9 @@ func LoadConfig() {
 		DbCfg.Host = sec.Key("host").String()
 		DbCfg.Name = sec.Key("name").String()
 		DbCfg.User = sec.Key("user").String()
+		DbCfg.MaxConn = sec.Key("max_conn").MustInt(0)
+		DbCfg.MaxOpenConn = sec.Key("max_open_conn").MustInt(0)
+		DbCfg.MaxIdleConn = sec.Key("max_idle_conn").MustInt(0)
 		if len(DbCfg.Pwd) == 0 {
 			DbCfg.Pwd = sec.Key("password").String()
 		}