83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
# Copyright (c) 2010-2012 OpenStack, LLC.
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#
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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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#
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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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# 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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from swift import gettext_ as _
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from eventlet import Timeout
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from swift.common.swob import Request, HTTPServerError
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from swift.common.utils import get_logger, generate_trans_id
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from swift.common.wsgi import WSGIContext
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class CatchErrorsContext(WSGIContext):
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def __init__(self, app, logger, trans_id_suffix=''):
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super(CatchErrorsContext, self).__init__(app)
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self.logger = logger
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self.trans_id_suffix = trans_id_suffix
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def handle_request(self, env, start_response):
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trans_id = generate_trans_id(self.trans_id_suffix)
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env['swift.trans_id'] = trans_id
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self.logger.txn_id = trans_id
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try:
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# catch any errors in the pipeline
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resp = self._app_call(env)
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except (Exception, Timeout) as err:
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self.logger.exception(_('Error: %s'), err)
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resp = HTTPServerError(request=Request(env),
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body='An error occurred',
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content_type='text/plain')
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resp.headers['X-Trans-Id'] = trans_id
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return resp(env, start_response)
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# make sure the response has the trans_id
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if self._response_headers is None:
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self._response_headers = []
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self._response_headers.append(('X-Trans-Id', trans_id))
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start_response(self._response_status, self._response_headers,
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self._response_exc_info)
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return resp
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class CatchErrorMiddleware(object):
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"""
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Middleware that provides high-level error handling and ensures that a
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transaction id will be set for every request.
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"""
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def __init__(self, app, conf):
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self.app = app
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self.logger = get_logger(conf, log_route='catch-errors')
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self.trans_id_suffix = conf.get('trans_id_suffix', '')
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def __call__(self, env, start_response):
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"""
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If used, this should be the first middleware in pipeline.
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"""
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context = CatchErrorsContext(self.app,
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self.logger,
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self.trans_id_suffix)
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return context.handle_request(env, start_response)
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def filter_factory(global_conf, **local_conf):
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conf = global_conf.copy()
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conf.update(local_conf)
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def except_filter(app):
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return CatchErrorMiddleware(app, conf)
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return except_filter
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