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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import importlib
from types import ModuleType
from typing import Optional, Sequence
def import_module(module_name: str) -> ModuleType:
return importlib.import_module(module_name)
def _count_attrs(
module_name: str, attrs: Optional[Sequence[str]] = None
) -> int:
found_attrs = 0
if not attrs:
return found_attrs
mod = importlib.import_module(module_name)
for attr in attrs:
if hasattr(mod, attr):
found_attrs += 1
return found_attrs
def find_module(
base_name: str,
search_paths: Sequence[str],
required_attrs: Optional[Sequence[str]] = None,
) -> tuple:
"""Finds specified modules"""
if not required_attrs:
required_attrs = []
# NOTE(harlowja): translate the search paths to include the base name.
lookup_paths = []
for path in search_paths:
real_path = []
if path:
real_path.extend(path.split("."))
real_path.append(base_name)
full_path = ".".join(real_path)
lookup_paths.append(full_path)
found_paths = []
for full_path in lookup_paths:
if not importlib.util.find_spec(full_path):
continue
# Check that required_attrs are all present within the module.
if _count_attrs(full_path, required_attrs) == len(required_attrs):
found_paths.append(full_path)
return (found_paths, lookup_paths)
# vi: ts=4 expandtab
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