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# vi: ts=4 expandtab
#
# 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 program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
from cloudinit import log as logging
LOG = logging.getLogger(__name__)
def import_module(module_name):
__import__(module_name)
return sys.modules[module_name]
def find_module(base_name, search_paths, required_attrs=None):
found_places = []
if not required_attrs:
required_attrs = []
# NOTE(harlowja): translate the search paths to include the base name.
real_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)
real_paths.append(full_path)
LOG.debug("Looking for modules %s that have attributes %s",
real_paths, required_attrs)
for full_path in real_paths:
mod = None
try:
mod = import_module(full_path)
except ImportError as e:
LOG.debug("Failed at attempted import of '%s' due to: %s",
full_path, e)
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_places.append(full_path)
LOG.debug("Found %s with attributes %s in %s", base_name,
required_attrs, found_places)
return found_places
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