Merge pull request #1419 from c9s/edwin/bitget/fix-xmaker-error

FIX: [bitget] use the now - 90 days instead of return err if since is 90 days earlier

README.md

@@ -130,8 +130,8 @@ the implementation.
 - OKEx Spot Exchange
 - Kucoin Spot Exchange
 - MAX Spot Exchange (located in Taiwan)
-- Bitget Exchange (In Progress)
-- Bybit Exchange (In Progress)
+- Bitget Exchange
+- Bybit Exchange
 
 ## Documentation and General Topics
 

pkg/exchange/bitget/bitgetapi/v2/client_test.go

@@ -34,15 +34,16 @@ func TestClient(t *testing.T) {
 	ctx := context.Background()
 
 	t.Run("GetUnfilledOrdersRequest", func(t *testing.T) {
-		req := client.NewGetUnfilledOrdersRequest().StartTime(1)
+		startTime := time.Now().Add(-30 * 24 * time.Hour)
+		req := client.NewGetUnfilledOrdersRequest().StartTime(startTime)
 		resp, err := req.Do(ctx)
 		assert.NoError(t, err)
 		t.Logf("resp: %+v", resp)
 	})
 
 	t.Run("GetHistoryOrdersRequest", func(t *testing.T) {
-		// market buy
-		req, err := client.NewGetHistoryOrdersRequest().Symbol("APEUSDT").Do(ctx)
+		startTime := time.Now().Add(-30 * 24 * time.Hour)
+		req, err := client.NewGetHistoryOrdersRequest().Symbol("APEUSDT").StartTime(startTime).Do(ctx)
 		assert.NoError(t, err)
 
 		t.Logf("place order resp: %+v", req)
@@ -61,7 +62,8 @@ func TestClient(t *testing.T) {
 	})
 
 	t.Run("GetTradeFillsRequest", func(t *testing.T) {
-		req, err := client.NewGetTradeFillsRequest().Symbol("APEUSDT").Do(ctx)
+		startTime := time.Now().Add(-30 * 24 * time.Hour)
+		req, err := client.NewGetTradeFillsRequest().Symbol("APEUSDT").StartTime(startTime).Do(ctx)
 		assert.NoError(t, err)
 
 		t.Logf("get trade fills resp: %+v", req)

pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request.go

@@ -6,6 +6,7 @@ package bitgetapi
 import (
 	"encoding/json"
 	"fmt"
+	"time"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
@@ -92,8 +93,8 @@ type GetHistoryOrdersRequest struct {
 	limit *string `param:"limit,query"`
 	// idLessThan requests the content on the page before this ID (older data), the value input should be the orderId of the corresponding interface.
 	idLessThan *string    `param:"idLessThan,query"`
-	startTime  *int64  `param:"startTime,query"`
-	endTime    *int64  `param:"endTime,query"`
+	startTime  *time.Time `param:"startTime,milliseconds,query"`
+	endTime    *time.Time `param:"endTime,milliseconds,query"`
 	orderId    *string    `param:"orderId,query"`
 }
 

pkg/exchange/bitget/bitgetapi/v2/get_history_orders_request_requestgen.go

@@ -10,6 +10,8 @@ import (
 	"net/url"
 	"reflect"
 	"regexp"
+	"strconv"
+	"time"
 )
 
 func (g *GetHistoryOrdersRequest) Symbol(symbol string) *GetHistoryOrdersRequest {
@@ -27,12 +29,12 @@ func (g *GetHistoryOrdersRequest) IdLessThan(idLessThan string) *GetHistoryOrder
 	return g
 }
 
-func (g *GetHistoryOrdersRequest) StartTime(startTime int64) *GetHistoryOrdersRequest {
+func (g *GetHistoryOrdersRequest) StartTime(startTime time.Time) *GetHistoryOrdersRequest {
 	g.startTime = &startTime
 	return g
 }
 
-func (g *GetHistoryOrdersRequest) EndTime(endTime int64) *GetHistoryOrdersRequest {
+func (g *GetHistoryOrdersRequest) EndTime(endTime time.Time) *GetHistoryOrdersRequest {
 	g.endTime = &endTime
 	return g
 }
@@ -74,7 +76,8 @@ func (g *GetHistoryOrdersRequest) GetQueryParameters() (url.Values, error) {
 		startTime := *g.startTime
 
 		// assign parameter of startTime
-		params["startTime"] = startTime
+		// convert time.Time to milliseconds time stamp
+		params["startTime"] = strconv.FormatInt(startTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check endTime field -> json key endTime
@@ -82,7 +85,8 @@ func (g *GetHistoryOrdersRequest) GetQueryParameters() (url.Values, error) {
 		endTime := *g.endTime
 
 		// assign parameter of endTime
-		params["endTime"] = endTime
+		// convert time.Time to milliseconds time stamp
+		params["endTime"] = strconv.FormatInt(endTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check orderId field -> json key orderId

pkg/exchange/bitget/bitgetapi/v2/get_trade_fills.go

@@ -1,6 +1,8 @@
 package bitgetapi
 
 import (
+	"time"
+
 	"github.com/c9s/requestgen"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
@@ -60,8 +62,8 @@ type GetTradeFillsRequest struct {
 	limit *string `param:"limit,query"`
 	// idLessThan requests the content on the page before this ID (older data), the value input should be the orderId of the corresponding interface.
 	idLessThan *string    `param:"idLessThan,query"`
-	startTime  *int64  `param:"startTime,query"`
-	endTime    *int64  `param:"endTime,query"`
+	startTime  *time.Time `param:"startTime,milliseconds,query"`
+	endTime    *time.Time `param:"endTime,milliseconds,query"`
 	orderId    *string    `param:"orderId,query"`
 }
 

pkg/exchange/bitget/bitgetapi/v2/get_trade_fills_request_requestgen.go

@@ -10,6 +10,8 @@ import (
 	"net/url"
 	"reflect"
 	"regexp"
+	"strconv"
+	"time"
 )
 
 func (s *GetTradeFillsRequest) Symbol(symbol string) *GetTradeFillsRequest {
@@ -27,12 +29,12 @@ func (s *GetTradeFillsRequest) IdLessThan(idLessThan string) *GetTradeFillsReque
 	return s
 }
 
-func (s *GetTradeFillsRequest) StartTime(startTime int64) *GetTradeFillsRequest {
+func (s *GetTradeFillsRequest) StartTime(startTime time.Time) *GetTradeFillsRequest {
 	s.startTime = &startTime
 	return s
 }
 
-func (s *GetTradeFillsRequest) EndTime(endTime int64) *GetTradeFillsRequest {
+func (s *GetTradeFillsRequest) EndTime(endTime time.Time) *GetTradeFillsRequest {
 	s.endTime = &endTime
 	return s
 }
@@ -71,7 +73,8 @@ func (s *GetTradeFillsRequest) GetQueryParameters() (url.Values, error) {
 		startTime := *s.startTime
 
 		// assign parameter of startTime
-		params["startTime"] = startTime
+		// convert time.Time to milliseconds time stamp
+		params["startTime"] = strconv.FormatInt(startTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check endTime field -> json key endTime
@@ -79,7 +82,8 @@ func (s *GetTradeFillsRequest) GetQueryParameters() (url.Values, error) {
 		endTime := *s.endTime
 
 		// assign parameter of endTime
-		params["endTime"] = endTime
+		// convert time.Time to milliseconds time stamp
+		params["endTime"] = strconv.FormatInt(endTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check orderId field -> json key orderId
@@ -185,6 +189,12 @@ func (s *GetTradeFillsRequest) GetSlugsMap() (map[string]string, error) {
 	return slugs, nil
 }
 
+// GetPath returns the request path of the API
+func (s *GetTradeFillsRequest) GetPath() string {
+	return "/api/v2/spot/trade/fills"
+}
+
+// Do generates the request object and send the request object to the API endpoint
 func (s *GetTradeFillsRequest) Do(ctx context.Context) ([]Trade, error) {
 
 	// no body params
@@ -194,7 +204,9 @@ func (s *GetTradeFillsRequest) Do(ctx context.Context) ([]Trade, error) {
 		return nil, err
 	}
 
-	apiURL := "/api/v2/spot/trade/fills"
+	var apiURL string
+
+	apiURL = s.GetPath()
 
 	req, err := s.client.NewAuthenticatedRequest(ctx, "GET", apiURL, query, params)
 	if err != nil {
@@ -211,6 +223,15 @@ func (s *GetTradeFillsRequest) Do(ctx context.Context) ([]Trade, error) {
 		return nil, err
 	}
 
+	type responseValidator interface {
+		Validate() error
+	}
+	validator, ok := interface{}(apiResponse).(responseValidator)
+	if ok {
+		if err := validator.Validate(); err != nil {
+			return nil, err
+		}
+	}
 	var data []Trade
 	if err := json.Unmarshal(apiResponse.Data, &data); err != nil {
 		return nil, err

pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request.go

@@ -4,6 +4,8 @@ package bitgetapi
 //go:generate -command PostRequest requestgen -method POST -responseType .APIResponse -responseDataField Data
 
 import (
+	"time"
+
 	"github.com/c9s/requestgen"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
@@ -40,8 +42,8 @@ type GetUnfilledOrdersRequest struct {
 	limit *string `param:"limit,query"`
 	// idLessThan requests the content on the page before this ID (older data), the value input should be the orderId of the corresponding interface.
 	idLessThan *string    `param:"idLessThan,query"`
-	startTime  *int64  `param:"startTime,query"`
-	endTime    *int64  `param:"endTime,query"`
+	startTime  *time.Time `param:"startTime,milliseconds,query"`
+	endTime    *time.Time `param:"endTime,milliseconds,query"`
 	orderId    *string    `param:"orderId,query"`
 }
 

pkg/exchange/bitget/bitgetapi/v2/get_unfilled_orders_request_requestgen.go

@@ -10,6 +10,8 @@ import (
 	"net/url"
 	"reflect"
 	"regexp"
+	"strconv"
+	"time"
 )
 
 func (g *GetUnfilledOrdersRequest) Symbol(symbol string) *GetUnfilledOrdersRequest {
@@ -27,12 +29,12 @@ func (g *GetUnfilledOrdersRequest) IdLessThan(idLessThan string) *GetUnfilledOrd
 	return g
 }
 
-func (g *GetUnfilledOrdersRequest) StartTime(startTime int64) *GetUnfilledOrdersRequest {
+func (g *GetUnfilledOrdersRequest) StartTime(startTime time.Time) *GetUnfilledOrdersRequest {
 	g.startTime = &startTime
 	return g
 }
 
-func (g *GetUnfilledOrdersRequest) EndTime(endTime int64) *GetUnfilledOrdersRequest {
+func (g *GetUnfilledOrdersRequest) EndTime(endTime time.Time) *GetUnfilledOrdersRequest {
 	g.endTime = &endTime
 	return g
 }
@@ -74,7 +76,8 @@ func (g *GetUnfilledOrdersRequest) GetQueryParameters() (url.Values, error) {
 		startTime := *g.startTime
 
 		// assign parameter of startTime
-		params["startTime"] = startTime
+		// convert time.Time to milliseconds time stamp
+		params["startTime"] = strconv.FormatInt(startTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check endTime field -> json key endTime
@@ -82,7 +85,8 @@ func (g *GetUnfilledOrdersRequest) GetQueryParameters() (url.Values, error) {
 		endTime := *g.endTime
 
 		// assign parameter of endTime
-		params["endTime"] = endTime
+		// convert time.Time to milliseconds time stamp
+		params["endTime"] = strconv.FormatInt(endTime.UnixNano()/int64(time.Millisecond), 10)
 	} else {
 	}
 	// check orderId field -> json key orderId
@@ -188,6 +192,12 @@ func (g *GetUnfilledOrdersRequest) GetSlugsMap() (map[string]string, error) {
 	return slugs, nil
 }
 
+// GetPath returns the request path of the API
+func (g *GetUnfilledOrdersRequest) GetPath() string {
+	return "/api/v2/spot/trade/unfilled-orders"
+}
+
+// Do generates the request object and send the request object to the API endpoint
 func (g *GetUnfilledOrdersRequest) Do(ctx context.Context) ([]UnfilledOrder, error) {
 
 	// no body params
@@ -197,7 +207,9 @@ func (g *GetUnfilledOrdersRequest) Do(ctx context.Context) ([]UnfilledOrder, err
 		return nil, err
 	}
 
-	apiURL := "/api/v2/spot/trade/unfilled-orders"
+	var apiURL string
+
+	apiURL = g.GetPath()
 
 	req, err := g.client.NewAuthenticatedRequest(ctx, "GET", apiURL, query, params)
 	if err != nil {
@@ -213,6 +225,16 @@ func (g *GetUnfilledOrdersRequest) Do(ctx context.Context) ([]UnfilledOrder, err
 	if err := response.DecodeJSON(&apiResponse); err != nil {
 		return nil, err
 	}
+
+	type responseValidator interface {
+		Validate() error
+	}
+	validator, ok := interface{}(apiResponse).(responseValidator)
+	if ok {
+		if err := validator.Validate(); err != nil {
+			return nil, err
+		}
+	}
 	var data []UnfilledOrder
 	if err := json.Unmarshal(apiResponse.Data, &data); err != nil {
 		return nil, err

pkg/exchange/bitget/exchange.go

@@ -24,7 +24,7 @@ const (
 	queryLimit                   = 100
 	defaultKLineLimit            = 100
 	maxOrderIdLen                = 36
-	queryMaxDuration  = 90 * 24 * time.Hour
+	maxHistoricalDataQueryPeriod = 90 * 24 * time.Hour
 )
 
 var log = logrus.WithFields(logrus.Fields{
@@ -123,7 +123,7 @@ func (e *Exchange) QueryTicker(ctx context.Context, symbol string) (*types.Ticke
 		return nil, fmt.Errorf("unexpected length of query single symbol: %+v", resp)
 	}
 
-	ticker := toGlobalTicker(resp[1])
+	ticker := toGlobalTicker(resp[0])
 	return &ticker, nil
 }
 
@@ -286,10 +286,10 @@ func (e *Exchange) SubmitOrder(ctx context.Context, order types.SubmitOrder) (cr
 
 	// we support only GTC/PostOnly, this is because:
 	// 1. We support only SPOT trading.
-	// 2. The query oepn/closed order does not including the `force` in SPOT.
+	// 2. The query open/closed order does not include the `force` in SPOT.
 	// If we support FOK/IOC, but you can't query them, that would be unreasonable.
 	// The other case to consider is 'PostOnly', which is a trade-off because we want to support 'xmaker'.
-	if order.TimeInForce != types.TimeInForceGTC {
+	if len(order.TimeInForce) != 0 && order.TimeInForce != types.TimeInForceGTC {
 		return nil, fmt.Errorf("time-in-force %s not supported", order.TimeInForce)
 	}
 	req.Force(v2.OrderForceGTC)
@@ -397,18 +397,24 @@ func (e *Exchange) QueryOpenOrders(ctx context.Context, symbol string) (orders [
 // QueryClosedOrders queries closed order by time range(`CreatedTime`) and id. The order of the response is in descending order.
 // If you need to retrieve all data, please utilize the function pkg/exchange/batch.ClosedOrderBatchQuery.
 //
+// REMARK: If your start time is 90 days earlier, we will update it to now - 90 days.
 // ** Since is inclusive, Until is exclusive. If you use a time range to query, you must provide both a start time and an end time. **
 // ** Since and Until cannot exceed 90 days. **
-// ** Since from the last 90 days can be queried. **
+// ** Since from the last 90 days can be queried **
 func (e *Exchange) QueryClosedOrders(ctx context.Context, symbol string, since, until time.Time, lastOrderID uint64) (orders []types.Order, err error) {
-	if time.Since(since) > queryMaxDuration {
-		return nil, fmt.Errorf("start time from the last 90 days can be queried, got: %s", since)
+	newSince := since
+	now := time.Now()
+
+	if time.Since(newSince) > maxHistoricalDataQueryPeriod {
+		newSince = now.Add(-maxHistoricalDataQueryPeriod)
+		log.Warnf("!!!BITGET EXCHANGE API NOTICE!!! The closed order API cannot query data beyond 90 days from the current date, update %s -> %s", since, newSince)
 	}
-	if until.Before(since) {
-		return nil, fmt.Errorf("end time %s before start %s", until, since)
+	if until.Before(newSince) {
+		log.Warnf("!!!BITGET EXCHANGE API NOTICE!!! The 'until' comes before 'since', update until to now(%s -> %s).", until, now)
+		until = now
 	}
-	if until.Sub(since) > queryMaxDuration {
-		return nil, fmt.Errorf("the start time %s and end time %s cannot exceed 90 days", since, until)
+	if until.Sub(newSince) > maxHistoricalDataQueryPeriod {
+		return nil, fmt.Errorf("the start time %s and end time %s cannot exceed 90 days", newSince, until)
 	}
 	if lastOrderID != 0 {
 		log.Warn("!!!BITGET EXCHANGE API NOTICE!!! The order of response is in descending order, so the last order id not supported.")
@@ -420,8 +426,8 @@ func (e *Exchange) QueryClosedOrders(ctx context.Context, symbol string, since,
 	res, err := e.v2client.NewGetHistoryOrdersRequest().
 		Symbol(symbol).
 		Limit(strconv.Itoa(queryLimit)).
-		StartTime(since.UnixMilli()).
-		EndTime(until.UnixMilli()).
+		StartTime(newSince).
+		EndTime(until).
 		Do(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("failed to call get order histories error: %w", err)
@@ -451,7 +457,7 @@ func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) (err
 	}
 
 	for _, order := range orders {
-		req := e.client.NewCancelOrderRequest()
+		req := e.v2client.NewCancelOrderRequest()
 
 		reqId := ""
 		switch {
@@ -472,7 +478,7 @@ func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) (err
 			continue
 		}
 
-		req.Symbol(order.Market.Symbol)
+		req.Symbol(order.Symbol)
 
 		if err := cancelOrderRateLimiter.Wait(ctx); err != nil {
 			errs = multierr.Append(errs, fmt.Errorf("cancel order rate limiter wait, order id: %s, error: %w", order.ClientOrderID, err))
@@ -485,8 +491,8 @@ func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) (err
 		}
 
 		// sanity check
-		if res.OrderId != reqId && res.ClientOrderId != reqId {
-			errs = multierr.Append(errs, fmt.Errorf("order id mismatch, exp: %s, respOrderId: %s, respClientOrderId: %s", reqId, res.OrderId, res.ClientOrderId))
+		if res.OrderId.String() != reqId && res.ClientOrderId != reqId {
+			errs = multierr.Append(errs, fmt.Errorf("order id mismatch, exp: %s, respOrderId: %d, respClientOrderId: %s", reqId, res.OrderId, res.ClientOrderId))
 			continue
 		}
 	}
@@ -498,6 +504,7 @@ func (e *Exchange) CancelOrders(ctx context.Context, orders ...types.Order) (err
 // using (`CreatedTime`) as the search criteria.
 // If you need to retrieve all data, please utilize the function pkg/exchange/batch.TradeBatchQuery.
 //
+// REMARK: If your start time is 90 days earlier, we will update it to now - 90 days.
 // ** StartTime is inclusive, EndTime is exclusive. If you use the EndTime, the StartTime is required. **
 // ** StartTime and EndTime cannot exceed 90 days. **
 func (e *Exchange) QueryTrades(ctx context.Context, symbol string, options *types.TradeQueryOptions) (trades []types.Trade, err error) {
@@ -508,24 +515,27 @@ func (e *Exchange) QueryTrades(ctx context.Context, symbol string, options *type
 	req := e.v2client.NewGetTradeFillsRequest()
 	req.Symbol(symbol)
 
+	var newStartTime time.Time
 	if options.StartTime != nil {
-		if time.Since(*options.StartTime) > queryMaxDuration {
-			return nil, fmt.Errorf("start time from the last 90 days can be queried, got: %s", options.StartTime)
+		newStartTime = *options.StartTime
+		if time.Since(newStartTime) > maxHistoricalDataQueryPeriod {
+			newStartTime = time.Now().Add(-maxHistoricalDataQueryPeriod)
+			log.Warnf("!!!BITGET EXCHANGE API NOTICE!!! The trade API cannot query data beyond 90 days from the current date, update %s -> %s", *options.StartTime, newStartTime)
 		}
-		req.StartTime(options.StartTime.UnixMilli())
+		req.StartTime(newStartTime)
 	}
 
 	if options.EndTime != nil {
-		if options.StartTime == nil {
+		if newStartTime.IsZero() {
 			return nil, errors.New("start time is required for query trades if you take end time")
 		}
-		if options.EndTime.Before(*options.StartTime) {
-			return nil, fmt.Errorf("end time %s before start %s", *options.EndTime, *options.StartTime)
+		if options.EndTime.Before(newStartTime) {
+			return nil, fmt.Errorf("end time %s before start %s", *options.EndTime, newStartTime)
 		}
-		if options.EndTime.Sub(*options.StartTime) > queryMaxDuration {
-			return nil, fmt.Errorf("start time %s and end time %s cannot greater than 90 days", options.StartTime, options.EndTime)
+		if options.EndTime.Sub(newStartTime) > maxHistoricalDataQueryPeriod {
+			return nil, fmt.Errorf("start time %s and end time %s cannot greater than 90 days", newStartTime, options.EndTime)
 		}
-		req.EndTime(options.EndTime.UnixMilli())
+		req.EndTime(*options.EndTime)
 	}
 
 	limit := options.Limit

pkg/types/exchange.go

@@ -15,30 +15,6 @@ const DateFormat = "2006-01-02"
 
 type ExchangeName string
 
-func (n *ExchangeName) Value() (driver.Value, error) {
-	return n.String(), nil
-}
-
-func (n *ExchangeName) UnmarshalJSON(data []byte) error {
-	var s string
-	if err := json.Unmarshal(data, &s); err != nil {
-		return err
-	}
-
-	switch s {
-	case "max", "binance", "okex", "kucoin":
-		*n = ExchangeName(s)
-		return nil
-
-	}
-
-	return fmt.Errorf("unknown or unsupported exchange name: %s, valid names are: max, binance, okex, kucoin", s)
-}
-
-func (n ExchangeName) String() string {
-	return string(n)
-}
-
 const (
 	ExchangeMax      ExchangeName = "max"
 	ExchangeBinance  ExchangeName = "binance"
@@ -59,17 +35,45 @@ var SupportedExchanges = []ExchangeName{
 	// note: we are not using "backtest"
 }
 
-func ValidExchangeName(a string) (ExchangeName, error) {
-	aa := strings.ToLower(a)
-	for _, n := range SupportedExchanges {
-		if string(n) == aa {
-			return n, nil
-		}
+func (n *ExchangeName) Value() (driver.Value, error) {
+	return n.String(), nil
 }
 
+func (n *ExchangeName) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+
+	*n = ExchangeName(s)
+	if !n.IsValid() {
+		return fmt.Errorf("%s is an invalid exchange name", s)
+	}
+
+	return nil
+}
+
+func (n ExchangeName) IsValid() bool {
+	switch n {
+	case ExchangeBinance, ExchangeBitget, ExchangeBybit, ExchangeMax, ExchangeOKEx, ExchangeKucoin:
+		return true
+	}
+	return false
+}
+
+func (n ExchangeName) String() string {
+	return string(n)
+}
+
+func ValidExchangeName(a string) (ExchangeName, error) {
+	exName := ExchangeName(strings.ToLower(a))
+	if !exName.IsValid() {
 		return "", fmt.Errorf("invalid exchange name: %s", a)
 	}
 
+	return exName, nil
+}
+
 type ExchangeMinimal interface {
 	Name() ExchangeName
 	PlatformFeeCurrency() string

pkg/types/strint.go

@@ -41,3 +41,10 @@ func (s *StrInt64) UnmarshalJSON(body []byte) error {
 
 	return nil
 }
+
+func (s *StrInt64) String() string {
+	if s == nil {
+		return ""
+	}
+	return strconv.FormatInt(int64(*s), 10)
+}