move and rename isSymbolBasedStrategy

pkg/bbgo/config.go

@@ -13,6 +13,7 @@ import (
 	"gopkg.in/yaml.v3"
 
 	"github.com/c9s/bbgo/pkg/datatype"
+	"github.com/c9s/bbgo/pkg/dynamic"
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/service"
 	"github.com/c9s/bbgo/pkg/types"
@@ -387,7 +388,7 @@ func (c *Config) GetSignature() string {
 		id := strategy.ID()
 		ps = append(ps, id)
 
-		if symbol, ok := isSymbolBasedStrategy(reflect.ValueOf(strategy)); ok {
+		if symbol, ok := dynamic.LookupSymbolField(reflect.ValueOf(strategy)); ok {
 			ps = append(ps, symbol)
 		}
 	}

pkg/bbgo/reflect.go

@@ -2,6 +2,8 @@ package bbgo
 
 import (
 	"reflect"
+
+	"github.com/c9s/bbgo/pkg/dynamic"
 )
 
 type InstanceIDProvider interface {
@@ -17,7 +19,7 @@ func callID(obj interface{}) string {
 		return ret[0].String()
 	}
 
-	if symbol, ok := isSymbolBasedStrategy(sv); ok {
+	if symbol, ok := dynamic.LookupSymbolField(sv); ok {
 		m := sv.MethodByName("ID")
 		ret := m.Call(nil)
 		return ret[0].String() + ":" + symbol
@@ -29,20 +31,3 @@ func callID(obj interface{}) string {
 	return ret[0].String() + ":"
 }
 
-func isSymbolBasedStrategy(rs reflect.Value) (string, bool) {
-	if rs.Kind() == reflect.Ptr {
-		rs = rs.Elem()
-	}
-
-	field := rs.FieldByName("Symbol")
-	if !field.IsValid() {
-		return "", false
-	}
-
-	if field.Kind() != reflect.String {
-		return "", false
-	}
-
-	return field.String(), true
-}
-

pkg/bbgo/trader.go

@@ -202,7 +202,7 @@ func (trader *Trader) RunSingleExchangeStrategy(ctx context.Context, strategy Si
 		return errors.Wrapf(err, "failed to inject OrderExecutor on %T", strategy)
 	}
 
-	if symbol, ok := isSymbolBasedStrategy(rs); ok {
+	if symbol, ok := dynamic.LookupSymbolField(rs); ok {
 		log.Infof("found symbol based strategy from %s", rs.Type())
 
 		market, ok := session.Market(symbol)

pkg/dynamic/field.go

@@ -6,3 +6,21 @@ func HasField(rs reflect.Value, fieldName string) (field reflect.Value, ok bool)
 	field = rs.FieldByName(fieldName)
 	return field, field.IsValid()
 }
+
+func LookupSymbolField(rs reflect.Value) (string, bool) {
+	if rs.Kind() == reflect.Ptr {
+		rs = rs.Elem()
+	}
+
+	field := rs.FieldByName("Symbol")
+	if !field.IsValid() {
+		return "", false
+	}
+
+	if field.Kind() != reflect.String {
+		return "", false
+	}
+
+	return field.String(), true
+}
+