74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
# Copyright 2016 IBM Corporation.
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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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from oslo_utils import importutils
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import webob.dec
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import nova.conf
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profiler = importutils.try_import('osprofiler.profiler')
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profiler_web = importutils.try_import('osprofiler.web')
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CONF = nova.conf.CONF
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class WsgiMiddleware(object):
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def __init__(self, application, **kwargs):
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self.application = application
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@classmethod
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def factory(cls, global_conf, **local_conf):
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if profiler_web:
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return profiler_web.WsgiMiddleware.factory(global_conf,
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**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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return request.get_response(self.application)
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def get_traced_meta():
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if profiler and 'profiler' in CONF and CONF.profiler.enabled:
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return profiler.TracedMeta
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else:
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# NOTE(rpodolyaka): if we do not return a child of type, then Python
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# fails to build a correct MRO when osprofiler is not installed
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class NoopMeta(type):
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pass
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return NoopMeta
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def trace_cls(name, **kwargs):
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"""Wrap the OSProfiler trace_cls decorator so that it will not try to
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patch the class unless OSProfiler is present and enabled in the config
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:param name: The name of action. E.g. wsgi, rpc, db, etc..
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:param kwargs: Any other keyword args used by profiler.trace_cls
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"""
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def decorator(cls):
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if profiler and 'profiler' in CONF and CONF.profiler.enabled:
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trace_decorator = profiler.trace_cls(name, kwargs)
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return trace_decorator(cls)
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return cls
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return decorator
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