1 files changed, 27 insertions, 0 deletions
diff --git a/oslo_middleware/correlation_id.py b/oslo_middleware/correlation_id.py
new file mode 100644
index 0000000..54d62ec
--- /dev/null
+++ b/oslo_middleware/correlation_id.py
@@ -0,0 +1,27 @@
+# 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.
+
+import uuid
+
+from oslo_middleware import base
+
+
+class CorrelationId(base.Middleware):
+    "Middleware that attaches a correlation id to WSGI request"
+
+    def process_request(self, req):
+        correlation_id = (req.headers.get("X_CORRELATION_ID") or
+                          str(uuid.uuid4()))
+        req.headers['X_CORRELATION_ID'] = correlation_id