def list_dir_by_dir_id(self, repo_id, dir_id, offset=-1, limit=-1):
     """
     Return: a list of Dirent objects. The objects are sorted as follows:
             - Directories are always before files
             - Entries are sorted by names in ascending order
     """
     return seafserv_threaded_rpc.list_dir(repo_id, dir_id, offset, limit)

 def list_dir_by_commit_and_path(self, repo_id, commit_id, path, offset=-1, limit=-1):
     try:
         dir_id = seafserv_threaded_rpc.get_dirid_by_path(repo_id, commit_id, path)
     except SearpcError as e:
         if str(e).startswith(SeafileAPI.PATH_NOT_EXIST_PREFIX):
             dir_id = None
         else:
             raise e
     if dir_id is None:
         return None
     return seafserv_threaded_rpc.list_dir(repo_id, dir_id, offset, limit)

 def list_dir_by_commit_and_path(self, repo_id,
                                 commit_id, path, offset=-1, limit=-1):
     dir_id = seafserv_threaded_rpc.get_dirid_by_path(repo_id, commit_id, path)
     return seafserv_threaded_rpc.list_dir(repo_id, dir_id, offset, limit)

 def list_dir_by_dir_id(self, repo_id, dir_id, offset=-1, limit=-1):
     return seafserv_threaded_rpc.list_dir(repo_id, dir_id, offset, limit)

 def list_dir_by_commit_and_path(self, commit_id, path):
     dir_id = seafserv_threaded_rpc.get_dir_id_by_commit_and_path(repo_id, path)
     return seafserv_threaded_rpc.list_dir(dir_id)

 def list_dir_by_dir_id(self, dir_id):
     return seafserv_threaded_rpc.list_dir(dir_id)

 def list_dir_by_path(self, repo_id, path, offset=-1, limit=-1):
     dir_id = seafserv_threaded_rpc.get_dir_id_by_path(repo_id, path)
     if dir_id is None:
         return None
     return seafserv_threaded_rpc.list_dir(repo_id, dir_id, offset, limit)