100 lines
2.8 KiB
Python
100 lines
2.8 KiB
Python
"""
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(c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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import falcon
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import json
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from oslo_log import log
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LOG = log.getLogger(__name__)
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class Middleware(object):
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"""
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WSGI wrapper for all freezer middlewares. Use this will allow to manage
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middlewares through paste
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"""
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def __init__(self, app):
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self.app = app
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def process_request(self, req):
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"""
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implement this function in your middleware to change the request
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if the function return None the request will be handled in the next
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level functions
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"""
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return None
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def process_response(self, resp):
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"""
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Implement this to modify your response
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"""
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return None
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@classmethod
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def factory(cls, global_conf, **local_conf):
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def filter(app):
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return cls(app)
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return filter
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def __call__(self, req, resp):
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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.app)
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response.req = req
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try:
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self.process_response(response)
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except falcon.HTTPError as e:
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LOG.error(e)
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# @todo this should be removed and oslo.middleware should be used instead
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class HealthApp(Middleware):
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"""
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Simple WSGI app to support HAProxy polling.
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If the requested url matches the configured path it replies
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with a 200 otherwise passes the request to the inner app
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"""
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def __call__(self, environ, start_response):
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if environ.get('PATH_INFO') == '/v1/health':
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start_response('200 OK', [])
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return []
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return self.app(environ, start_response)
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class RequireJSON(object):
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def process_request(self, req, resp):
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if not req.client_accepts_json:
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raise falcon.HTTPNotAcceptable(
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'Freezer-api only supports responses encoded as JSON.',
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href='http://docs.examples.com/api/json')
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class JSONTranslator(object):
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def process_response(self, req, resp, resource):
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if not hasattr(resp, 'body'):
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return
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if isinstance(resp.data, dict):
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resp.data = json.dumps(resp.data)
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if isinstance(resp.body, dict):
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resp.body = json.dumps(resp.body)
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