Add ConnectionRefused exception.

When novaclient gets a Connection Refused it now presents that as a
ConnectionRefused exception with appropriate information rather than as
an HTTP exception.  Addresses bug 1047078.

vagrant@precise64:/opt/stack/python-novaclient$ nova image-list
ERROR: ConnectionRefused: '[Errno 111] Connection refused'

Change-Id: Iebf4d78a524004d5e79d2219b35f90fbd38ee690

1 files changed, 11 insertions, 0 deletions

diff --git a/novaclient/exceptions.py b/novaclient/exceptions.py
index da626921..da6f8d4c 100644
--- a/novaclient/exceptions.py
+++ b/novaclient/exceptions.py
@@ -51,6 +51,17 @@ class AmbiguousEndpoints(Exception):
         return "AmbiguousEndpoints: %s" % repr(self.endpoints)
 
 
+class ConnectionRefused(Exception):
+    """
+    Connection refused: the server refused the connection.
+    """
+    def __init__(self, response=None):
+        self.response = response
+
+    def __str__(self):
+        return "ConnectionRefused: %s" % repr(self.response)
+
+
 class ClientException(Exception):
     """
     The base exception class for all exceptions this library raises.