Log request headers in debug mode

Log all request headers in API server for user debugging. For X-*
headers, only show the murano own headers and several useful
headers added by keystone auth middleware, and skip other X-*
headers to make log more clear.

Change-Id: I5a73e4684e5dd9ca826b097a830505d5566c4395
Closes-Bug: #1505202

murano/common/wsgi.py

@@ -401,6 +401,11 @@ class Resource(object):
     def __call__(self, request):
         """WSGI method that controls (de)serialization and method dispatch."""
 
+        LOG.debug("{method} {url}\nHEADERS: {headers}".format(
+                  method=request.method,
+                  url=request.url,
+                  headers=self._format_request_headers(request.headers)))
+
         try:
             action, action_args, accept = self.deserialize_request(request)
         except exceptions.UnsupportedContentType:
@@ -456,6 +461,28 @@ class Resource(object):
 
         return args
 
+    def _format_request_headers(self, headers):
+        """Format the request headers to be logged.
+
+        To keep log more clear, only show the X-* header include murano own
+        header and several useful headers added by keystone auth middleware,
+        and skip other X-* headers.
+        """
+        string_parts = []
+
+        # Only show following X-* header
+        useful_headers = ("X-Configuration-Session",
+                          "X-Roles",
+                          "X-User-Id",
+                          "X-Tenant-Id")
+
+        for header, value in headers.iteritems():
+            if header.startswith("X-") and header not in useful_headers:
+                continue
+            string_parts.append("{0}: {1}".format(header, value))
+
+        return ', '.join(string_parts)
+
 
 class ActionDispatcher(object):
     """Maps method name to local methods through action name."""