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# Copyright (c) 2013 Rackspace Hosting
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from __future__ import annotations
import typing as ty
from oslo_utils import uuidutils
from oslo_middleware import base
if ty.TYPE_CHECKING:
import webob.request
import webob.response
class CorrelationId(base.ConfigurableMiddleware):
"Middleware that attaches a correlation id to WSGI request"
@staticmethod
def process_request(
req: webob.request.Request,
) -> webob.response.Response | None:
correlation_id = (
req.headers.get("X_CORRELATION_ID") or uuidutils.generate_uuid()
)
req.headers['X_CORRELATION_ID'] = correlation_id
return None
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