deb-murano/murano/common/app_loader.py
OpenStack Proposal Bot bc8943c8cc Modified docstrings to comply with pep8 H405 style check
Closes-Bug: #1563270

Change-Id: I987d846f1a86ecee1fcfb0f99877563a10481478
2016-05-10 20:18:23 +00:00

99 lines
3.1 KiB
Python

# Copyright (c) 2015 Mirantis, Inc.
#
# 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 os
from oslo_config import cfg
from oslo_log import log as logging
from paste import deploy
from murano.common.i18n import _
CONF = cfg.CONF
def _get_deployment_flavor():
"""Retrieve the paste_deploy.flavor config item
Retrieve the paste_deploy.flavor config item, formatted appropriately
for appending to the application name.
"""
flavor = CONF.paste_deploy.flavor
return '' if not flavor else ('-' + flavor)
def _get_paste_config_path():
paste_suffix = '-paste.ini'
conf_suffix = '.conf'
if CONF.config_file:
# Assume paste config is in a paste.ini file corresponding
# to the last config file
path = CONF.config_file[-1].replace(conf_suffix, paste_suffix)
else:
path = CONF.prog + '-paste.ini'
return CONF.find_file(os.path.basename(path))
def _get_deployment_config_file():
"""Retrieve the deployment_config_file config item
Retrieve the deployment_config_file config item, formatted as an
absolute pathname.
"""
path = CONF.paste_deploy.config_file
if not path:
path = _get_paste_config_path()
if not path:
msg = _("Unable to locate paste config file for %s.") % CONF.prog
raise RuntimeError(msg)
return os.path.abspath(path)
def load_paste_app(app_name=None):
"""Builds and returns a WSGI app from a paste config file.
We assume the last config file specified in the supplied ConfigOpts
object is the paste config file.
:param app_name: name of the application to load
:raises RuntimeError when config file cannot be located or application
cannot be loaded from config file
"""
if app_name is None:
app_name = CONF.prog
# append the deployment flavor to the application name,
# in order to identify the appropriate paste pipeline
app_name += _get_deployment_flavor()
conf_file = _get_deployment_config_file()
try:
logger = logging.getLogger(__name__)
logger.debug("Loading {app_name} from {conf_file}".format(
conf_file=conf_file, app_name=app_name))
app = deploy.loadapp("config:%s" % conf_file, name=app_name)
return app
except (LookupError, ImportError) as e:
msg = _("Unable to load %(app_name)s from configuration file"
" %(conf_file)s. \nGot: %(e)r") % {'conf_file': conf_file,
'app_name': app_name,
'e': e}
logger.error(msg)
raise RuntimeError(msg)