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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
"""
Utilities for dynamically loading Python code.
"""
import pkgutil
import importlib
def import_fullname(name, paths=None):
"""
Imports a variable or class based on a full name, optionally searching for it in the paths.
"""
paths = paths or []
if name is None:
return None
def do_import(name):
if name and ('.' in name):
module_name, name = name.rsplit('.', 1)
return getattr(__import__(module_name, fromlist=[name], level=0), name)
else:
raise ImportError('import not found: %s' % name)
try:
return do_import(name)
except ImportError:
for path in paths:
try:
return do_import('%s.%s' % (path, name))
except Exception as e:
raise ImportError('cannot import %s, because %s' % (name, e))
raise ImportError('import not found: %s' % name)
def import_modules(name):
"""
Imports a module and all its sub-modules, recursively. Relies on modules defining a ``MODULES``
attribute listing their sub-module names.
"""
module = __import__(name, fromlist=['MODULES'], level=0)
if hasattr(module, 'MODULES'):
for module_ in module.MODULES:
import_modules('%s.%s' % (name, module_))
# TODO merge with import_fullname
def load_attribute(attribute_path):
"""
Dynamically load an attribute based on the path to it. E.g.
``some_package.some_module.some_attribute``, will load ``some_attribute`` from the
``some_package.some_module`` module.
"""
module_name, attribute_name = attribute_path.rsplit('.', 1)
try:
module = importlib.import_module(module_name)
return getattr(module, attribute_name)
except ImportError:
# TODO: handle
raise
except AttributeError:
# TODO: handle
raise
def iter_modules():
# apparently pkgutil had some issues in python 2.6. Accessing any root level directories
# failed. and it got the entire process of importing fail. Since we only need any
# aria_extension related loading, in the meantime we could try to import only those
# (and assume they are not located at the root level.
# [In python 2.7 it does actually ignore any OSError].
yielded = {}
for importer in pkgutil.iter_importers():
try:
for module_name, ispkg in pkgutil.iter_importer_modules(importer):
if module_name not in yielded:
yielded[module_name] = True
yield importer, module_name, ispkg
except OSError:
pass
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