005ebdaeca
Currently, Log translation is motivated by oslo's move to prioritized translation of strings, as documented at https://wiki.openstack.org/wiki/LoggingStandards#Log_Translation - add log translation hints for warning, error and info levels - move from LOG.warning to LOG.warn - remove use of % as a string formatter, use the log functionality instead Partial implements blueprint log-translation-hints Change-Id: I715f69154bd199dabac7d537b982b875204f8b33
103 lines
3.5 KiB
Python
103 lines
3.5 KiB
Python
#
|
|
# 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.
|
|
|
|
"""Utilities to dynamically load plugin modules.
|
|
|
|
Modules imported this way remain accessible to static imports, regardless of
|
|
the order in which they are imported. For modules that are not part of an
|
|
existing package tree, use create_subpackage() to dynamically create a package
|
|
for them before loading them.
|
|
"""
|
|
|
|
import pkgutil
|
|
import sys
|
|
import types
|
|
|
|
from heat.common.i18n import _LE
|
|
from heat.openstack.common import log as logging
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
def _module_name(*components):
|
|
"""Assemble a fully-qualified module name from its components."""
|
|
return '.'.join(components)
|
|
|
|
|
|
def create_subpackage(path, parent_package_name, subpackage_name="plugins"):
|
|
"""Dynamically create a package into which to load plugins.
|
|
|
|
This allows us to not include an __init__.py in the plugins directory. We
|
|
must still create a package for plugins to go in, otherwise we get warning
|
|
messages during import. This also provides a convenient place to store the
|
|
path(s) to the plugins directory.
|
|
"""
|
|
package_name = _module_name(parent_package_name, subpackage_name)
|
|
|
|
package = types.ModuleType(package_name)
|
|
package.__path__ = [path] if isinstance(path, basestring) else list(path)
|
|
sys.modules[package_name] = package
|
|
|
|
return package
|
|
|
|
|
|
def _import_module(importer, module_name, package):
|
|
"""Import a module dynamically into a package.
|
|
|
|
:param importer: PEP302 Importer object (which knows the path to look in).
|
|
:param module_name: the name of the module to import.
|
|
:param package: the package to import the module into.
|
|
"""
|
|
|
|
# Duplicate copies of modules are bad, so check if this has already been
|
|
# imported statically
|
|
if module_name in sys.modules:
|
|
return sys.modules[module_name]
|
|
|
|
loader = importer.find_module(module_name)
|
|
if loader is None:
|
|
return None
|
|
|
|
module = loader.load_module(module_name)
|
|
|
|
# Make this accessible through the parent package for static imports
|
|
local_name = module_name.partition(package.__name__ + '.')[2]
|
|
module_components = local_name.split('.')
|
|
parent = reduce(getattr, module_components[:-1], package)
|
|
setattr(parent, module_components[-1], module)
|
|
|
|
return module
|
|
|
|
|
|
def load_modules(package, ignore_error=False):
|
|
"""Dynamically load all modules from a given package."""
|
|
path = package.__path__
|
|
pkg_prefix = package.__name__ + '.'
|
|
|
|
for importer, module_name, is_package in pkgutil.walk_packages(path,
|
|
pkg_prefix):
|
|
# NOTE(chmouel): Skips tests package or this will try to load
|
|
# them when loading plugins.
|
|
if '.tests.' in module_name:
|
|
continue
|
|
|
|
try:
|
|
module = _import_module(importer, module_name, package)
|
|
except ImportError:
|
|
LOG.error(_LE('Failed to import module %s'), module_name)
|
|
if not ignore_error:
|
|
raise
|
|
else:
|
|
if module is not None:
|
|
yield module
|