e33d6bfb0b
In some modules the global LOG is not used any more. And the import of logging is not used. This patch removes the unused logging import and LOG vars. Co-Authored-By: ChangBo Guo(gcb) <eric.guo@easystack.cn> Change-Id: Ia72f99688ce00aeecca9239f9ef123611259a2fa
153 lines
4.8 KiB
Python
153 lines
4.8 KiB
Python
# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Utility methods for working with WSGI servers."""
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import webob.dec
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import webob.exc
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from cinder.i18n import _
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class Request(webob.Request):
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pass
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class Application(object):
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"""Base WSGI application wrapper. Subclasses need to implement __call__."""
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@classmethod
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def factory(cls, global_config, **local_config):
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"""Used for paste app factories in paste.deploy config files.
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Any local configuration (that is, values under the [app:APPNAME]
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section of the paste config) will be passed into the `__init__` method
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as kwargs.
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A hypothetical configuration would look like:
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[app:wadl]
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latest_version = 1.3
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paste.app_factory = cinder.api.fancy_api:Wadl.factory
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which would result in a call to the `Wadl` class as
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import cinder.api.fancy_api
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fancy_api.Wadl(latest_version='1.3')
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You could of course re-implement the `factory` method in subclasses,
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but using the kwarg passing it shouldn't be necessary.
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"""
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return cls(**local_config)
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def __call__(self, environ, start_response):
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r"""Subclasses will probably want to implement __call__ like this:
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@webob.dec.wsgify(RequestClass=Request)
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def __call__(self, req):
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# Any of the following objects work as responses:
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# Option 1: simple string
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res = 'message\n'
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# Option 2: a nicely formatted HTTP exception page
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res = exc.HTTPForbidden(explanation='Nice try')
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# Option 3: a webob Response object (in case you need to play with
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# headers, or you want to be treated like an iterable)
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res = Response();
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res.app_iter = open('somefile')
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# Option 4: any wsgi app to be run next
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res = self.application
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# Option 5: you can get a Response object for a wsgi app, too, to
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# play with headers etc
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res = req.get_response(self.application)
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# You can then just return your response...
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return res
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# ... or set req.response and return None.
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req.response = res
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See the end of http://pythonpaste.org/webob/modules/dec.html
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for more info.
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"""
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raise NotImplementedError(_('You must implement __call__'))
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class Middleware(Application):
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"""Base WSGI middleware.
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These classes require an application to be
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initialized that will be called next. By default the middleware will
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simply call its wrapped app, or you can override __call__ to customize its
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behavior.
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"""
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@classmethod
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def factory(cls, global_config, **local_config):
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"""Used for paste app factories in paste.deploy config files.
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Any local configuration (that is, values under the [filter:APPNAME]
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section of the paste config) will be passed into the `__init__` method
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as kwargs.
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A hypothetical configuration would look like:
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[filter:analytics]
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redis_host = 127.0.0.1
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paste.filter_factory = cinder.api.analytics:Analytics.factory
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which would result in a call to the `Analytics` class as
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import cinder.api.analytics
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analytics.Analytics(app_from_paste, redis_host='127.0.0.1')
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You could of course re-implement the `factory` method in subclasses,
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but using the kwarg passing it shouldn't be necessary.
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"""
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def _factory(app):
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return cls(app, **local_config)
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return _factory
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def __init__(self, application):
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self.application = application
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def process_request(self, req):
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"""Called on each request.
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If this returns None, the next application down the stack will be
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executed. If it returns a response then that response will be returned
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and execution will stop here.
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"""
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return None
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def process_response(self, response):
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"""Do whatever you'd like to the response."""
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return response
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@webob.dec.wsgify(RequestClass=Request)
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def __call__(self, req):
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response = self.process_request(req)
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if response:
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return response
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response = req.get_response(self.application)
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return self.process_response(response)
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