Load Balancing as a Service (LBaaS) for OpenStack
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octavia/octavia/api/app.py

106 lines
3.5 KiB

# Copyright 2014 Rackspace
#
# 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
import keystonemiddleware.audit as audit_middleware
from oslo_config import cfg
from oslo_log import log as logging
from oslo_middleware import cors
from oslo_middleware import http_proxy_to_wsgi
from oslo_middleware import request_id
from pecan import configuration as pecan_configuration
from pecan import make_app as pecan_make_app
from octavia.api import config as app_config
from octavia.api.drivers import driver_factory
from octavia.common import constants
from octavia.common import exceptions
from octavia.common import keystone
from octavia.common import service as octavia_service
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
def get_pecan_config():
"""Returns the pecan config."""
filename = app_config.__file__.replace('.pyc', '.py')
return pecan_configuration.conf_from_file(filename)
def _init_drivers():
"""Initialize provider drivers."""
for provider in CONF.api_settings.enabled_provider_drivers:
driver_factory.get_driver(provider)
def setup_app(pecan_config=None, debug=False, argv=None):
"""Creates and returns a pecan wsgi app."""
if argv is None:
argv = sys.argv
octavia_service.prepare_service(argv)
cfg.CONF.log_opt_values(LOG, logging.DEBUG)
_init_drivers()
if not pecan_config:
pecan_config = get_pecan_config()
pecan_configuration.set_config(dict(pecan_config), overwrite=True)
return pecan_make_app(
pecan_config.app.root,
wrap_app=_wrap_app,
debug=debug,
hooks=pecan_config.app.hooks,
wsme=pecan_config.wsme
)
def _wrap_app(app):
"""Wraps wsgi app with additional middlewares."""
app = request_id.RequestId(app)
if CONF.audit.enabled:
try:
app = audit_middleware.AuditMiddleware(
app,
audit_map_file=CONF.audit.audit_map_file,
ignore_req_list=CONF.audit.ignore_req_list
)
except (EnvironmentError, OSError,
audit_middleware.PycadfAuditApiConfigError) as e:
raise exceptions.InputFileError(
file_name=CONF.audit.audit_map_file,
reason=e
)
if cfg.CONF.api_settings.auth_strategy == constants.KEYSTONE:
app = keystone.SkippingAuthProtocol(app, {})
app = http_proxy_to_wsgi.HTTPProxyToWSGI(app)
# This should be the last middleware in the list (which results in
# it being the first in the middleware chain). This is to ensure
# that any errors thrown by other middleware, such as an auth
# middleware - are annotated with CORS headers, and thus accessible
# by the browser.
app = cors.CORS(app, cfg.CONF)
cors.set_defaults(
allow_headers=['X-Auth-Token', 'X-Openstack-Request-Id'],
allow_methods=['GET', 'PUT', 'POST', 'DELETE'],
expose_headers=['X-Auth-Token', 'X-Openstack-Request-Id']
)
return app