93 lines
2.9 KiB
Python
93 lines
2.9 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.
|
|
#
|
|
# Copyright (c) 2017 Wind River Systems, Inc.
|
|
#
|
|
# The right to copy, distribute, modify, or otherwise make use
|
|
# of this software may be licensed only pursuant to the terms
|
|
# of an applicable Wind River license agreement.
|
|
#
|
|
|
|
from oslo_log import log as logging
|
|
from oslo_service.wsgi import Request
|
|
import webob.dec
|
|
import webob.exc
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class Application(object):
|
|
|
|
@classmethod
|
|
def factory(cls, global_config, **local_config):
|
|
"""Used for paste app factories in paste.deploy config files.
|
|
|
|
"""
|
|
return cls(**local_config)
|
|
|
|
def __call__(self, environ, start_response):
|
|
raise NotImplementedError('You must implement __call__')
|
|
|
|
|
|
class Middleware(Application):
|
|
|
|
"""Base WSGI middleware wrapper.
|
|
|
|
These classes require an application to be
|
|
initialized that will be called next. By default the middleware will
|
|
simply call its wrapped app, or you can override __call__ to customize its
|
|
behavior.
|
|
"""
|
|
|
|
@classmethod
|
|
def factory(cls, global_config, **local_config):
|
|
|
|
"""Used for paste app factories in paste.deploy config files.
|
|
|
|
Any local configuration (that is, values under the [filter:APPNAME]
|
|
section of the paste config) will be passed into the `__init__` method
|
|
as kwargs.
|
|
"""
|
|
|
|
def _factory(app):
|
|
# https://bugs.launchpad.net/starlingx/+bug/1865085
|
|
return cls(app, global_config, **local_config) # pylint: disable=too-many-function-args
|
|
return _factory
|
|
|
|
def __init__(self, application):
|
|
self.application = application
|
|
|
|
def process_request(self, req):
|
|
|
|
"""Called on each request.
|
|
|
|
If this returns None, the next application down the stack will be
|
|
executed. If it returns a response then that response will be returned
|
|
and execution will stop here.
|
|
"""
|
|
|
|
return None
|
|
|
|
def process_response(self, response):
|
|
"""Do whatever you'd like to the response."""
|
|
return response
|
|
|
|
@webob.dec.wsgify(RequestClass=Request)
|
|
def __call__(self, req):
|
|
response = self.process_request(req)
|
|
if response:
|
|
return response
|
|
# call the next app on the stack to process the request
|
|
response = req.get_response(self.application)
|
|
return self.process_response(response)
|