diff --git a/examples/data.go b/examples/data.go
index 54ed576..bf22c1f 100644
--- a/examples/data.go
+++ b/examples/data.go
@@ -8,6 +8,7 @@ import (
 	"github.com/yedf/dtm/common"
 )
 
+// RunSqlScript 1
 func RunSqlScript(mysql map[string]string, script string) {
 	conf := map[string]string{}
 	common.MustRemarshal(mysql, &conf)
@@ -29,6 +30,7 @@ func RunSqlScript(mysql map[string]string, script string) {
 	}
 }
 
+// PopulateMysql populate example mysql data
 func PopulateMysql() {
 	common.InitApp(common.GetProjectDir(), &Config)
 	Config.Mysql["database"] = dbName
diff --git a/examples/main_base.go b/examples/main_base.go
index 0bc4e07..599cb38 100644
--- a/examples/main_base.go
+++ b/examples/main_base.go
@@ -10,12 +10,16 @@ import (
 )
 
 const (
-	BusiApi  = "/api/busi"
+	// BusiAPI busi api prefix
+	BusiAPI = "/api/busi"
+	// BusiPort busi server port
 	BusiPort = 8081
 )
 
-var Busi string = fmt.Sprintf("http://localhost:%d%s", BusiPort, BusiApi)
+// Busi busi service url prefix
+var Busi string = fmt.Sprintf("http://localhost:%d%s", BusiPort, BusiAPI)
 
+// BaseAppStartup base app startup
 func BaseAppStartup() *gin.Engine {
 	logrus.Printf("examples starting")
 	app := common.GetGinApp()
@@ -26,14 +30,17 @@ func BaseAppStartup() *gin.Engine {
 	return app
 }
 
+// AutoEmptyString auto reset to empty when used once
 type AutoEmptyString struct {
 	value string
 }
 
+// SetOnce set a value once
 func (s *AutoEmptyString) SetOnce(v string) {
 	s.value = v
 }
 
+// Fetch fetch the stored value, then reset the value to empty
 func (s *AutoEmptyString) Fetch() string {
 	v := s.value
 	s.value = ""
@@ -50,6 +57,7 @@ type mainSwitchType struct {
 	CanSubmitResult       AutoEmptyString
 }
 
+// MainSwitch controls busi success or fail
 var MainSwitch mainSwitchType
 
 func handleGeneralBusiness(c *gin.Context, result1 string, result2 string, busi string) (interface{}, error) {
@@ -60,26 +68,27 @@ func handleGeneralBusiness(c *gin.Context, result1 string, result2 string, busi
 
 }
 
+// BaseAddRoute add base route handler
 func BaseAddRoute(app *gin.Engine) {
-	app.POST(BusiApi+"/TransIn", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransIn", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransInResult.Fetch(), reqFrom(c).TransInResult, "transIn")
 	}))
-	app.POST(BusiApi+"/TransOut", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransOut", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransOutResult.Fetch(), reqFrom(c).TransOutResult, "transIn")
 	}))
-	app.POST(BusiApi+"/TransInConfirm", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransInConfirm", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransInConfirmResult.Fetch(), "", "transIn")
 	}))
-	app.POST(BusiApi+"/TransOutConfirm", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransOutConfirm", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransOutConfirmResult.Fetch(), "", "transIn")
 	}))
-	app.POST(BusiApi+"/TransInRevert", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransInRevert", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransInRevertResult.Fetch(), "", "transIn")
 	}))
-	app.POST(BusiApi+"/TransOutRevert", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransOutRevert", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return handleGeneralBusiness(c, MainSwitch.TransOutRevertResult.Fetch(), "", "transIn")
 	}))
-	app.GET(BusiApi+"/CanSubmit", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.GET(BusiAPI+"/CanSubmit", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		logrus.Printf("%s CanSubmit", c.Query("gid"))
 		return common.OrString(MainSwitch.CanSubmitResult.Fetch(), "SUCCESS"), nil
 	}))
diff --git a/examples/main_msg.go b/examples/main_msg.go
index 86f1691..6394c45 100644
--- a/examples/main_msg.go
+++ b/examples/main_msg.go
@@ -6,9 +6,11 @@ import (
 	"github.com/yedf/dtm/dtmcli"
 )
 
+// MsgSetup 1
 func MsgSetup(app *gin.Engine) {
 }
 
+// MsgFireRequest 1
 func MsgFireRequest() {
 	logrus.Printf("a busi transaction begin")
 	req := &TransReq{
diff --git a/examples/main_saga.go b/examples/main_saga.go
index 9409750..4375137 100644
--- a/examples/main_saga.go
+++ b/examples/main_saga.go
@@ -6,9 +6,11 @@ import (
 	"github.com/yedf/dtm/dtmcli"
 )
 
+// SagaSetup 1
 func SagaSetup(app *gin.Engine) {
 }
 
+// SagaFireRequest 1
 func SagaFireRequest() {
 	logrus.Printf("a saga busi transaction begin")
 	req := &TransReq{
diff --git a/examples/main_saga_barrier.go b/examples/main_saga_barrier.go
index a7e9118..f4641f9 100644
--- a/examples/main_saga_barrier.go
+++ b/examples/main_saga_barrier.go
@@ -10,6 +10,7 @@ import (
 	"gorm.io/gorm"
 )
 
+// SagaBarrierFireRequest 1
 func SagaBarrierFireRequest() {
 	logrus.Printf("a busi transaction begin")
 	req := &TransReq{Amount: 30}
@@ -21,13 +22,12 @@ func SagaBarrierFireRequest() {
 	e2p(err)
 }
 
-// api
-
+// SagaBarrierAddRoute 1
 func SagaBarrierAddRoute(app *gin.Engine) {
-	app.POST(BusiApi+"/SagaBTransIn", common.WrapHandler(sagaBarrierTransIn))
-	app.POST(BusiApi+"/SagaBTransInCompensate", common.WrapHandler(sagaBarrierTransInCompensate))
-	app.POST(BusiApi+"/SagaBTransOut", common.WrapHandler(sagaBarrierTransOut))
-	app.POST(BusiApi+"/SagaBTransOutCompensate", common.WrapHandler(sagaBarrierTransOutCompensate))
+	app.POST(BusiAPI+"/SagaBTransIn", common.WrapHandler(sagaBarrierTransIn))
+	app.POST(BusiAPI+"/SagaBTransInCompensate", common.WrapHandler(sagaBarrierTransInCompensate))
+	app.POST(BusiAPI+"/SagaBTransOut", common.WrapHandler(sagaBarrierTransOut))
+	app.POST(BusiAPI+"/SagaBTransOutCompensate", common.WrapHandler(sagaBarrierTransOutCompensate))
 	logrus.Printf("examples listening at %d", BusiPort)
 }
 
diff --git a/examples/main_tcc.go b/examples/main_tcc.go
index dd5423a..2164dc6 100644
--- a/examples/main_tcc.go
+++ b/examples/main_tcc.go
@@ -7,8 +7,9 @@ import (
 	"github.com/yedf/dtm/dtmcli"
 )
 
+// TccSetup 1
 func TccSetup(app *gin.Engine) {
-	app.POST(BusiApi+"/TransInTcc", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(BusiAPI+"/TransInTcc", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		tcc, err := dtmcli.TccFromReq(c)
 		if err != nil {
 			return nil, err
@@ -25,6 +26,7 @@ func TccSetup(app *gin.Engine) {
 	}))
 }
 
+// TccFireRequest 1
 func TccFireRequest() {
 	logrus.Printf("tcc transaction begin")
 	_, err := dtmcli.TccGlobalTransaction(DtmServer, func(tcc *dtmcli.Tcc) (rerr error) {
diff --git a/examples/main_tcc_barrier.go b/examples/main_tcc_barrier.go
index 2bc85a1..1757e00 100644
--- a/examples/main_tcc_barrier.go
+++ b/examples/main_tcc_barrier.go
@@ -10,6 +10,7 @@ import (
 	"github.com/yedf/dtm/dtmcli"
 )
 
+// TccBarrierFireRequest 1
 func TccBarrierFireRequest() {
 	logrus.Printf("tcc transaction begin")
 	_, err := dtmcli.TccGlobalTransaction(DtmServer, func(tcc *dtmcli.Tcc) (rerr error) {
@@ -33,20 +34,19 @@ func TccBarrierFireRequest() {
 	e2p(err)
 }
 
-// api
-
+// TccBarrierAddRoute 1
 func TccBarrierAddRoute(app *gin.Engine) {
-	app.POST(BusiApi+"/TccBTransInTry", common.WrapHandler(tccBarrierTransInTry))
-	app.POST(BusiApi+"/TccBTransInConfirm", common.WrapHandler(tccBarrierTransInConfirm))
-	app.POST(BusiApi+"/TccBTransInCancel", common.WrapHandler(tccBarrierTransInCancel))
-	app.POST(BusiApi+"/TccBTransOutTry", common.WrapHandler(tccBarrierTransOutTry))
-	app.POST(BusiApi+"/TccBTransOutConfirm", common.WrapHandler(tccBarrierTransOutConfirm))
-	app.POST(BusiApi+"/TccBTransOutCancel", common.WrapHandler(tccBarrierTransOutCancel))
+	app.POST(BusiAPI+"/TccBTransInTry", common.WrapHandler(tccBarrierTransInTry))
+	app.POST(BusiAPI+"/TccBTransInConfirm", common.WrapHandler(tccBarrierTransInConfirm))
+	app.POST(BusiAPI+"/TccBTransInCancel", common.WrapHandler(tccBarrierTransInCancel))
+	app.POST(BusiAPI+"/TccBTransOutTry", common.WrapHandler(tccBarrierTransOutTry))
+	app.POST(BusiAPI+"/TccBTransOutConfirm", common.WrapHandler(tccBarrierTransOutConfirm))
+	app.POST(BusiAPI+"/TccBTransOutCancel", common.WrapHandler(tccBarrierTransOutCancel))
 	logrus.Printf("examples listening at %d", BusiPort)
 }
 
-const transInUid = 1
-const transOutUid = 2
+const transInUID = 1
+const transOutUID = 2
 
 func adjustTrading(sdb *sql.DB, uid int, amount int) (interface{}, error) {
 	db := common.SQLDB2DB(sdb)
@@ -75,36 +75,36 @@ func adjustBalance(sdb *sql.DB, uid int, amount int) (interface{}, error) {
 // TCC下，转入
 func tccBarrierTransInTry(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustTrading(sdb, transInUid, reqFrom(c).Amount)
+		return adjustTrading(sdb, transInUID, reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransInConfirm(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustBalance(sdb, transInUid, reqFrom(c).Amount)
+		return adjustBalance(sdb, transInUID, reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransInCancel(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustTrading(sdb, transInUid, -reqFrom(c).Amount)
+		return adjustTrading(sdb, transInUID, -reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransOutTry(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustTrading(sdb, transOutUid, -reqFrom(c).Amount)
+		return adjustTrading(sdb, transOutUID, -reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransOutConfirm(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustBalance(sdb, transOutUid, -reqFrom(c).Amount)
+		return adjustBalance(sdb, transOutUID, -reqFrom(c).Amount)
 	})
 }
 
 func tccBarrierTransOutCancel(c *gin.Context) (interface{}, error) {
 	return dtmcli.ThroughBarrierCall(dbGet().ToSQLDB(), dtmcli.TransInfoFromReq(c), func(sdb *sql.DB) (interface{}, error) {
-		return adjustTrading(sdb, transOutUid, reqFrom(c).Amount)
+		return adjustTrading(sdb, transOutUID, reqFrom(c).Amount)
 	})
 }
diff --git a/examples/main_xa.go b/examples/main_xa.go
index d03543e..97a5b5f 100644
--- a/examples/main_xa.go
+++ b/examples/main_xa.go
@@ -9,28 +9,34 @@ import (
 	"github.com/yedf/dtm/dtmcli"
 )
 
+// XaClient XA client connection
 var XaClient *dtmcli.XaClient = nil
 
+// UserAccount busi model
 type UserAccount struct {
 	common.ModelBase
 	UserId  int
 	Balance string
 }
 
+// TableName gorm table name
 func (u *UserAccount) TableName() string { return "user_account" }
 
+// UserAccountTrading freeze user account table
 type UserAccountTrading struct {
 	common.ModelBase
 	UserId         int
 	TradingBalance string
 }
 
+// TableName gorm table name
 func (u *UserAccountTrading) TableName() string { return "user_account_trading" }
 
 func dbGet() *common.DB {
 	return common.DbGet(Config.Mysql)
 }
 
+// XaFireRequest 1
 func XaFireRequest() {
 	_, err := XaClient.XaGlobalTransaction(func(xa *dtmcli.Xa) (rerr error) {
 		defer common.P2E(&rerr)
@@ -44,10 +50,10 @@ func XaFireRequest() {
 	e2p(err)
 }
 
-// api
+// XaSetup 1
 func XaSetup(app *gin.Engine) {
-	app.POST(BusiApi+"/TransInXa", common.WrapHandler(xaTransIn))
-	app.POST(BusiApi+"/TransOutXa", common.WrapHandler(xaTransOut))
+	app.POST(BusiAPI+"/TransInXa", common.WrapHandler(xaTransIn))
+	app.POST(BusiAPI+"/TransOutXa", common.WrapHandler(xaTransOut))
 	Config.Mysql["database"] = "dtm_busi"
 	XaClient = dtmcli.NewXaClient(DtmServer, Config.Mysql, app, Busi+"/xa")
 }
@@ -80,6 +86,7 @@ func xaTransOut(c *gin.Context) (interface{}, error) {
 	return M{"result": "SUCCESS"}, nil
 }
 
+// ResetXaData 1
 func ResetXaData() {
 	db := dbGet()
 	db.Must().Exec("truncate user_account")
diff --git a/examples/quick_start.go b/examples/quick_start.go
index a7844af..ca4efab 100644
--- a/examples/quick_start.go
+++ b/examples/quick_start.go
@@ -13,12 +13,12 @@ import (
 // 启动命令：go run app/main.go qs
 
 // 事务参与者的服务地址
-const qsBusiApi = "/api/busi_start"
+const qsBusiAPI = "/api/busi_start"
 const qsBusiPort = 8082
 
-var qsBusi = fmt.Sprintf("http://localhost:%d%s", qsBusiPort, qsBusiApi)
+var qsBusi = fmt.Sprintf("http://localhost:%d%s", qsBusiPort, qsBusiAPI)
 
-// 被app/main.go调用，启动服务并运行示例
+// QuickStarMain called by app/main.go
 func QuickStarMain() {
 	qsStartSvr()
 	qsFireRequest()
@@ -46,16 +46,16 @@ func qsFireRequest() {
 }
 
 func qsAddRoute(app *gin.Engine) {
-	app.POST(qsBusiApi+"/TransIn", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(qsBusiAPI+"/TransIn", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return M{"result": "SUCCESS"}, nil
 	}))
-	app.POST(qsBusiApi+"/TransInCompensate", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(qsBusiAPI+"/TransInCompensate", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return M{"result": "SUCCESS"}, nil
 	}))
-	app.POST(qsBusiApi+"/TransOut", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(qsBusiAPI+"/TransOut", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return M{"result": "SUCCESS"}, nil
 	}))
-	app.POST(qsBusiApi+"/TransOutCompensate", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
+	app.POST(qsBusiAPI+"/TransOutCompensate", common.WrapHandler(func(c *gin.Context) (interface{}, error) {
 		return M{"result": "SUCCESS"}, nil
 	}))
 }
diff --git a/examples/types.go b/examples/types.go
index 9fed90f..1f56e1a 100644
--- a/examples/types.go
+++ b/examples/types.go
@@ -10,16 +10,20 @@ import (
 
 var e2p = common.E2P
 
+// M alias
 type M = map[string]interface{}
 
-// 指定dtm服务地址
+// DtmServer dtm service address
 const DtmServer = "http://localhost:8080/api/dtmsvr"
 
 const (
+	// SagaBarrierBusiPort saga barrier sample port
 	SagaBarrierBusiPort = iota + 8090
+	// TccBarrierBusiPort tcc barrier sample port
 	TccBarrierBusiPort
 )
 
+// TransReq transaction request payload
 type TransReq struct {
 	Amount         int    `json:"amount"`
 	TransInResult  string `json:"transInResult"`
@@ -30,6 +34,7 @@ func (t *TransReq) String() string {
 	return fmt.Sprintf("amount: %d transIn: %s transOut: %s", t.Amount, t.TransInResult, t.TransOutResult)
 }
 
+// GenTransReq 1
 func GenTransReq(amount int, outFailed bool, inFailed bool) *TransReq {
 	return &TransReq{
 		Amount:         amount,