1 files changed, 64 insertions, 0 deletions
diff --git a/lenovo/thinkcloud/middleware.py b/lenovo/thinkcloud/middleware.py
new file mode 100644
index 00000000..33f04267
--- /dev/null
+++ b/lenovo/thinkcloud/middleware.py
@@ -0,0 +1,64 @@
+# Copyright (c) 2017-2018 Lenovo Systems, Inc.
+#
+# 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 django.conf import settings
+from onaplogging.mdcContext import MDC
+
+FORWARDED_FOR_FIELDS = ["HTTP_X_FORWARDED_FOR", "HTTP_X_FORWARDED_HOST",
+                        "HTTP_X_FORWARDED_SERVER"]
+
+
+class LogContextMiddleware(object):
+
+    #  the last IP behind multiple proxies,  if no exist proxies
+    #  get local host ip.
+    def _getLastIp(self, request):
+
+        ip = ""
+        try:
+            for field in FORWARDED_FOR_FIELDS:
+                if field in request.META:
+                    if ',' in request.META[field]:
+                        parts = request.META[field].split(',')
+                        ip = parts[-1].strip().split(":")[0]
+                    else:
+                        ip = request.META[field].split(":")[0]
+
+            if ip == "":
+                ip = request.META.get("HTTP_HOST").split(":")[0]
+
+        except Exception:
+            pass
+
+        return ip
+
+    def process_request(self, request):
+        # fetch propageted Id from other component. if do not fetch id,
+        # generate one.
+        ReqeustID = request.META.get("HTTP_X_TRANSACTIONID", None)
+        if ReqeustID is None:
+            ReqeustID = str(uuid.uuid3(uuid.NAMESPACE_URL, settings.MULTIVIM_VERSION))
+        MDC.put("requestID", ReqeustID)
+        # generate the reqeust id
+        InvocationID = str(uuid.uuid4())
+        MDC.put("invocationID", InvocationID)
+        MDC.put("serviceName", settings.MULTIVIM_VERSION)
+        MDC.put("serviceIP", self._getLastIp(request))
+        return None
+
+    def process_response(self, request, response):
+
+        MDC.clear()
+        return response