improve balances command

pkg/cmd/balances.go

@@ -3,37 +3,72 @@ package cmd
 import (
 	"context"
 	"fmt"
+	"os"
 
+	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
+
+	"github.com/c9s/bbgo/pkg/bbgo"
 )
 
-//godotenv -f .env.local go run ./cmd/bbgo balances --session=ftx
+func init() {
+	balancesCmd.Flags().String("session", "", "the exchange session name for querying balances")
+	RootCmd.AddCommand(balancesCmd)
+}
+
+// go run ./cmd/bbgo balances --session=ftx
 var balancesCmd = &cobra.Command{
 	Use:          "balances",
 	SilenceUsage: true,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		ctx := context.Background()
-		session, err := cmd.Flags().GetString("session")
-		if err != nil {
-			return fmt.Errorf("can't get session from flags: %w", err)
-		}
-		ex, err := newExchange(session)
-		if err != nil {
-			return err
-		}
-		b, err := ex.QueryAccountBalances(ctx)
-		if err != nil {
-			return err
-		}
-		log.Infof("balances: %+v", b)
 
+		configFile, err := cmd.Flags().GetString("config")
+		if err != nil {
+			return err
+		}
+
+		if len(configFile) == 0 {
+			return errors.New("--config option is required")
+		}
+
+		if _, err := os.Stat(configFile); os.IsNotExist(err) {
+			return err
+		}
+
+		userConfig, err := bbgo.Load(configFile, false)
+		if err != nil {
+			return err
+		}
+
+
+		environ := bbgo.NewEnvironment()
+		if err := environ.ConfigureDatabase(ctx) ; err != nil {
+			return err
+		}
+
+		if err := environ.ConfigureExchangeSessions(userConfig); err != nil {
+			return err
+		}
+
+		sessionName, err := cmd.Flags().GetString("session")
+		if err != nil {
+			return err
+		}
+
+		session, ok := environ.Session(sessionName)
+		if !ok {
+			return fmt.Errorf("session %s not found", sessionName)
+		}
+
+		b, err := session.Exchange.QueryAccountBalances(ctx)
+		if err != nil {
+			return err
+		}
+
+		log.Infof("balances: %+v", b)
 		return nil
 	},
 }
 
-func init() {
-	balancesCmd.Flags().String("session", "", "the exchange session name for sync")
-
-	RootCmd.AddCommand(balancesCmd)
-}