add

trading_assistant_api/common/logger/logger.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"os"
 	"fmt"
+	"path/filepath"
 )
 
 type Logger interface {
@@ -46,3 +47,20 @@ func (p *prefLogger) Fatalf(format string, v ...any) {
 func WithPrefix(prefix string) Logger {
 	return &prefLogger{prefix: prefix}
 }
+
+func SetupFile(path string) error {
+	if path == "" {
+		return fmt.Errorf("log file path empty")
+	}
+	if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
+		return err
+	}
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	defaultLogger = &stdLogger{
+		l: log.New(f, "[app] ", log.LstdFlags|log.Lshortfile),
+	}
+	return nil
+}