Add WSGI Middleware
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osprofiler/web.py
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57
osprofiler/web.py
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# Copyright 2013 OpenStack Foundation.
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# 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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import base64
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import pickle
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import webob.dec
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from osprofiler import profiler
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def add_trace_id_header(self, headers):
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p = profiler.get_profiler()
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if p:
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kwargs = {'base_id': p.get_base_id(), 'parent_id': p.get_id[-1]}
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headers['X-Trace-Info'] = base64.b64encode(pickle.dumps(kwargs))
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class WsgiMiddleware(object):
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"""WSGI Middleware that enables tracing for an application."""
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def __init__(self, application, service_name='server', name='WSGI'):
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self.application = application
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self.service_name = service_name
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self.name = name
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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, **local_conf)
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return filter_
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@webob.dec.wsgify
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def __call__(self, request):
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trace_info = {}
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trace_info_enc = request.headers.get('X-Trace-Info')
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if trace_info_enc:
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trace_info = pickle.loads(base64.b64decode(trace_info_enc))
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p = profiler.init(trace_info.get("base_id"),
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trace_info.get("parent_id"),
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self.service_name)
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with p(self.name, info={'url': request.url}):
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response = request.get_response(self.application)
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return response
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