Migrate to oslo request_id middleware - mv 2.46

In order to support cross project request_id tracking, we need to be
on oslo.middleware for request_id. This makes that change now that
oslo middleware can support compat headers.

api-ref is not updated yet because x-compute-request-id was apparently
never documented there, and the timing on landing this is narrow
because the moment a requirements update happens we'll have this new
behavior.

Part of bp:oslo-middleware-request-id

Change-Id: I4d9f91b01de12cd0a676fc649953f98473b6b416

doc/api_samples/versions/v21-version-get-resp.json

@@ -19,7 +19,7 @@
             }
         ],
         "status": "CURRENT",
-        "version": "2.45",
+        "version": "2.46",
         "min_version": "2.1",
         "updated": "2013-07-23T11:33:21Z"
     }

doc/api_samples/versions/versions-get-resp.json

@@ -22,7 +22,7 @@
                 }
             ],
             "status": "CURRENT",
-            "version": "2.45",
+            "version": "2.46",
             "min_version": "2.1",
             "updated": "2013-07-23T11:33:21Z"
         }

nova/api/compute_req_id.py

@@ -15,30 +15,22 @@
 
 """Middleware that ensures x-compute-request-id
 
-Using this middleware provides a convenient way to attach the
-x-compute-request-id to only v2 responses. Previously, this header was set in
-api/openstack/wsgi.py
+Nova's notion of request-id tracking predates any common idea, so the
+original version of this header in OpenStack was
+x-compute-request-id. Eventually we got oslo, and all other projects
+implemented this with x-openstack-request-id.
+
+However, x-compute-request-id was always part of our contract. The
+following migrates us to use x-openstack-request-id as well, by using
+the common middleware.
 
-Responses for v2.1 API are taken care of by the request_id middleware provided
-in oslo.
 """
 
-from oslo_context import context
-from oslo_middleware import base
-import webob.dec
+from oslo_middleware import request_id
 
 
-ENV_REQUEST_ID = 'openstack.request_id'
 HTTP_RESP_HEADER_REQUEST_ID = 'x-compute-request-id'
 
 
-class ComputeReqIdMiddleware(base.Middleware):
-
-    @webob.dec.wsgify
-    def __call__(self, req):
-        req_id = context.generate_request_id()
-        req.environ[ENV_REQUEST_ID] = req_id
-        response = req.get_response(self.application)
-        if HTTP_RESP_HEADER_REQUEST_ID not in response.headers:
-            response.headers.add(HTTP_RESP_HEADER_REQUEST_ID, req_id)
-        return response
+class ComputeReqIdMiddleware(request_id.RequestId):
+    compat_headers = [HTTP_RESP_HEADER_REQUEST_ID]

nova/api/openstack/api_version_request.py

@@ -109,6 +109,7 @@ REST_API_VERSION_HISTORY = """REST API Version History:
              header in the response for the snapshot image, they now return a
              json dict in the response body with an image_id key and uuid
              value.
+    * 2.46 - Return ``X-OpenStack-Request-ID`` header on requests.
 """
 
 # The minimum and maximum versions of the API supported
@@ -117,7 +118,7 @@ REST_API_VERSION_HISTORY = """REST API Version History:
 # Note(cyeoh): This only applies for the v2.1 API once microversions
 # support is fully merged. It does not affect the V2 API.
 _MIN_API_VERSION = "2.1"
-_MAX_API_VERSION = "2.45"
+_MAX_API_VERSION = "2.46"
 DEFAULT_API_VERSION = _MIN_API_VERSION
 
 # Almost all proxy APIs which related to network, images and baremetal

nova/api/openstack/compute/rest_api_version_history.rst

@@ -536,3 +536,12 @@ user documentation.
   The ``createImage`` and ``createBackup`` server action APIs no longer return
   a ``Location`` header in the response for the snapshot image, they now return
   a json dict in the response body with an ``image_id`` key and uuid value.
+
+2.46
+----
+
+  The request_id created for every inbound request is now returned in
+  ``X-OpenStack-Request-ID`` in addition to ``X-Compute-Request-ID``
+  to be consistent with the rest of OpenStack. This is a signaling
+  only microversion, as these header settings happen well before
+  microversion processing.

nova/tests/unit/api/test_compute_req_id.py

@@ -23,16 +23,19 @@ from nova.api import compute_req_id
 from nova import test
 
 
+ENV_REQUEST_ID = 'openstack.request_id'
+
+
 class RequestIdTest(test.NoDBTestCase):
     def test_generate_request_id(self):
         @webob.dec.wsgify
         def application(req):
-            return req.environ[compute_req_id.ENV_REQUEST_ID]
+            return req.environ[ENV_REQUEST_ID]
 
         app = compute_req_id.ComputeReqIdMiddleware(application)
         req = webob.Request.blank('/test')
         req_id = context.generate_request_id()
-        req.environ[compute_req_id.ENV_REQUEST_ID] = req_id
+        req.environ[ENV_REQUEST_ID] = req_id
         res = req.get_response(app)
 
         res_id = res.headers.get(compute_req_id.HTTP_RESP_HEADER_REQUEST_ID)

releasenotes/notes/openstack-request-id-95f7bc7e960344a4.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Nova now uses oslo.middleware for request_id processing. This
+    means that there is now a new ``X-OpenStack-Request-ID`` header
+    returned on every request which mirrors the content of the
+    existing ``X-Compute-Request-ID``. The expected existence of this
+    header is signaled by Microversion 2.46. If server version >= 2.46, you
+    can expect to see this header in your results (regardless of
+    microversion requested).

requirements.txt

@@ -49,7 +49,7 @@ oslo.privsep!=1.17.0,>=1.9.0 # Apache-2.0
 oslo.i18n!=3.15.2,>=2.1.0 # Apache-2.0
 oslo.service>=1.10.0 # Apache-2.0
 rfc3986>=0.3.1 # Apache-2.0
-oslo.middleware>=3.10.0 # Apache-2.0
+oslo.middleware>=3.27.0 # Apache-2.0
 psutil>=3.2.2 # BSD
 oslo.versionedobjects>=1.17.0 # Apache-2.0
 os-brick>=1.13.0 # Apache-2.0