Fill status code for every HTTPException

Change-Id: Ib73398f0a555c9ac4534fd3ce4a1c06e51bc5962
Closes-Bug: #1515519

heatclient/exc.py

@@ -44,7 +44,7 @@ class HTTPException(BaseException):
     """Base exception for all HTTP-derived exceptions."""
     code = 'N/A'
 
-    def __init__(self, message=None):
+    def __init__(self, message=None, code=None):
         super(HTTPException, self).__init__(message)
         try:
             self.error = jsonutils.loads(message)
@@ -59,6 +59,8 @@ class HTTPException(BaseException):
         except Exception:
             self.error = {'error':
                           {'message': self.message or self.__class__.__doc__}}
+        if self.code == "N/A" and code is not None:
+            self.code = code
 
     def __str__(self):
         message = self.error['error'].get('message', 'Internal Error')
@@ -179,7 +181,7 @@ for obj_name in dir(sys.modules[__name__]):
 def from_response(response):
     """Return an instance of an HTTPException based on requests response."""
     cls = _code_map.get(response.status_code, HTTPException)
-    return cls(response.content)
+    return cls(response.content, response.status_code)
 
 
 class NoTokenLookupException(Exception):

heatclient/tests/unit/test_common_http.py

@@ -818,6 +818,22 @@ class SessionClientTest(testtools.TestCase):
         # Assert that the raised exception can be converted to string
         self.assertIsNotNone(six.text_type(e))
 
+    def test_504_error_response(self):
+        # for 504 we don't have specific exception type
+        fake = fakes.FakeHTTPResponse(
+            504,
+            'FAIL',
+            {'content-type': 'application/octet-stream'},
+            '')
+        self.request.return_value = (fake, '')
+
+        client = http.SessionClient(session=mock.ANY,
+                                    auth=mock.ANY)
+        e = self.assertRaises(exc.HTTPException,
+                              client.request, '', 'GET')
+
+        self.assertEqual(504, e.code)
+
     def test_kwargs(self):
         fake = fakes.FakeHTTPResponse(
             200,