file rotate bug

logs/file.go

@@ -60,9 +60,6 @@ type fileLogWriter struct {
 // newFileWriter create a FileLogWriter returning as LoggerInterface.
 func newFileWriter() Logger {
 	w := &fileLogWriter{
-		Filename: "",
-		MaxLines: 1000000,
-		MaxSize:  1 << 28, //256 MB
 		Daily:   true,
 		MaxDays: 7,
 		Rotate:  true,
@@ -259,8 +256,8 @@ func (w *fileLogWriter) deleteOldLog() {
 			}
 		}()
 
-		if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.MaxDays) {
-			if strings.HasPrefix(filepath.Base(path), w.fileNameOnly) &&
+		if !info.IsDir() && info.ModTime().Add(24*time.Hour*time.Duration(w.MaxDays)).Before(time.Now()) {
+			if strings.HasPrefix(filepath.Base(path), filepath.Base(w.fileNameOnly)) &&
 				strings.HasSuffix(filepath.Base(path), w.suffix) {
 				os.Remove(path)
 			}