72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
|
|
# Copyright (C) 2012 New Dream Network, LLC (DreamHost) All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
import sys
|
|
|
|
from anvil import log as logging
|
|
from anvil import utils
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
def construct_entry_point(fullname, *args, **kwargs):
|
|
cls = import_entry_point(fullname)
|
|
LOG.debug("Constructing %r (%s)", fullname, cls)
|
|
if kwargs:
|
|
LOG.debug("Kwargs are:")
|
|
utils.log_object(kwargs, logger=LOG, level=logging.DEBUG)
|
|
if args:
|
|
LOG.debug("Args are:")
|
|
utils.log_object(args, logger=LOG, level=logging.DEBUG)
|
|
return cls(*args, **kwargs)
|
|
|
|
|
|
def partition(fullname):
|
|
"""The name should be in dotted.path:ClassName syntax."""
|
|
if ':' not in fullname:
|
|
raise ValueError('Invalid entry point specifier %r' % fullname)
|
|
(module_name, _sep, classname) = fullname.partition(':')
|
|
return (module_name, classname)
|
|
|
|
|
|
def import_entry_point(fullname):
|
|
"""Given a name import the class and return it."""
|
|
(module_name, classname) = partition(fullname)
|
|
try:
|
|
import_module(module_name)
|
|
# This is done to ensure we get the right submodule
|
|
module = __import__(module_name)
|
|
for submodule in module_name.split('.')[1:]:
|
|
module = getattr(module, submodule)
|
|
LOG.debug("Importing class: %s", classname)
|
|
cls = getattr(module, classname)
|
|
# TODO(harlowja) actually verify this is a class??
|
|
except (ImportError, AttributeError, ValueError) as err:
|
|
raise RuntimeError('Could not load entry point %s: %s' %
|
|
(fullname, err))
|
|
return cls
|
|
|
|
|
|
def import_module(module_name):
|
|
try:
|
|
LOG.debug("Importing module: %s", module_name)
|
|
__import__(module_name)
|
|
return sys.modules.get(module_name, None)
|
|
except (ImportError, ValueError) as err:
|
|
raise RuntimeError('Could not load module %s: %s' %
|
|
(module_name, err))
|