from pathlib import Path
from django.core.files.storage import default_storage


def walk_folder(storage, base="/", error_handler=None):
    """
    Recursively walks a folder, using Django's File Storage.

    :param storage: <Storage>
    :param base: <str> The base folder
    :param error_handler: <callable>
    :yields: A tuple of base, subfolders, files
    """
    try:
        folders, files = storage.listdir(base)
    except OSError as e:
        logger.exception("An error occurred while walking directory %s", base)
        if error_handler:
            error_handler(e)
        return

    for subfolder in folders:
        # On S3, we don't really have subfolders, so exclude "."
        if subfolder == ".":
            continue

        new_base = str(Path(base, subfolder))
        for f in walk_folder(storage, new_base):
            yield f

    yield base, folders, files
    

for base, subfolders, files in walk_folder(default_storage, "some_folder"):
    print(base, subfolders, files)