def load_function()

in azure_functions_worker/loader.py [0:0]
33 lines of code
8 McCabe index (conditional complexity)

def load_function(name: str, directory: str, script_file: str,
                  entry_point: Optional[str]):
    dir_path = pathlib.Path(directory)
    script_path = pathlib.Path(script_file) if script_file else pathlib.Path(
        _DEFAULT_SCRIPT_FILENAME)
    if not entry_point:
        entry_point = _DEFAULT_ENTRY_POINT

    register_function_dir(dir_path.parent)

    try:
        rel_script_path = script_path.relative_to(dir_path.parent)
    except ValueError:
        raise RuntimeError(
            f'script path {script_file} is not relative to the specified '
            f'directory {directory}'
        )

    last_part = rel_script_path.parts[-1]
    modname, ext = os.path.splitext(last_part)
    if ext != '.py':
        raise RuntimeError(
            f'cannot load function {name}: '
            f'invalid Python filename {script_file}')

    modname_parts = [_AZURE_NAMESPACE]
    modname_parts.extend(rel_script_path.parts[:-1])

    # If the __init__.py contains the code, we should avoid double loading.
    if modname.lower() != '__init__':
        modname_parts.append(modname)

    fullmodname = '.'.join(modname_parts)

    mod = importlib.import_module(fullmodname)

    func = getattr(mod, entry_point, None)
    if func is None or not callable(func):
        raise RuntimeError(
            f'cannot load function {name}: function {entry_point}() is not '
            f'present in {rel_script_path}')

    return func