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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
from cloudinit import util
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 match_case_insensitive_module_name(mod_name: str) -> str:
"""Check the importable datasource modules for a case-insensitive match."""
# nocloud-net is the only datasource that requires matching on a name that
# does not match its python module - canonicalize it here
if "nocloud-net" == mod_name.lower():
mod_name = mod_name[:-4]
if not mod_name.startswith("DataSource"):
mod_name = f"DataSource{mod_name}"
modules = {}
# mypy is right to warn here. This isn't a documented method.
# However it has worked for years without issue, so fixing it is not
# a high priority. We'll fix it when it breaks.
spec = importlib.util.find_spec("cloudinit.sources") # type: ignore
if spec and spec.submodule_search_locations:
for dir in spec.submodule_search_locations:
modules.update(util.get_modules_from_dir(dir))
for module in modules.values():
if module.lower() == mod_name.lower():
return module
return mod_name
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 = []
lookup_paths = []
found_paths = []
for path in search_paths:
# Add base name to search paths. Filter out empty paths.
full_path = ".".join(filter(None, [path, base_name]))
lookup_paths.append(full_path)
# mypy is right to warn here. This isn't a documented method.
# However it has worked for years without issue, so fixing it is not
# a high priority. We'll fix it when it breaks.
if not importlib.util.find_spec(full_path): # type: ignore
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)