Current File : //usr/lib/python3.6/site-packages/cloudinit/importer.py

# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <[email protected]>
# Author: Juerg Haefliger <[email protected]>
# Author: Joshua Harlow <[email protected]>
#
# This file is part of cloud-init. See LICENSE file for license information.

import sys
import typing

# annotations add value for development, but don't break old versions
# pyver: 3.6 -> 3.8
# pylint: disable=E1101
if sys.version_info >= (3, 8):

    class MetaSchema(typing.TypedDict):
        name: str
        id: str
        title: str
        description: str
        distros: typing.List[str]
        examples: typing.List[str]
        frequency: str

else:
    MetaSchema = dict
# pylint: enable=E1101


def import_module(module_name):
    __import__(module_name)
    return sys.modules[module_name]


def find_module(base_name: str, search_paths, required_attrs=None) -> tuple:
    """Finds and imports 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:
        mod = None
        try:
            mod = import_module(full_path)
        except ImportError:
            pass
        if not mod:
            continue
        found_attrs = 0
        for attr in required_attrs:
            if hasattr(mod, attr):
                found_attrs += 1
        if found_attrs == len(required_attrs):
            found_paths.append(full_path)
    return (found_paths, lookup_paths)


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