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OpenStack Study: base.py**** CubicPower OpenStack Study ****
# Copyright 2011 OpenStack Foundation. # All Rights Reserved. # # 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. """Base class(es) for WSGI Middleware.""" import webob.dec
**** CubicPower OpenStack Study **** class Middleware(object): """Base WSGI middleware wrapper. These classes require an application to be initialized that will be called next. By
**** CubicPower OpenStack Study **** def factory(cls, global_conf, **local_conf): """Factory method for paste.deploy.""" return cls
**** CubicPower OpenStack Study **** def __init__(self, application): self.application = application
**** CubicPower OpenStack Study **** 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
**** CubicPower OpenStack Study **** def process_response(self, response): """Do whatever you'd like to the response.""" return response @webob.dec.wsgify
**** CubicPower OpenStack Study **** def __call__(self, req): response = self.process_request(req) if response: return response response = req.get_response(self.application) return self.process_response(response)
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