Add API versioning support

* Specific versions supported are managed in XXXXXX.client.py with a
  mapping from version to client class.  This is based on the scheme
  that is included in novaclient; none of the other client libs have
  that capability.

Change-Id: I930b197f1189e7f52c3b0096e73e0773cf925542

1 files changed, 8 insertions, 0 deletions

diff --git a/openstackclient/common/utils.py b/openstackclient/common/utils.py
index fe0e5bcb..e0f35ad4 100644
--- a/openstackclient/common/utils.py
+++ b/openstackclient/common/utils.py
@@ -20,6 +20,7 @@ Common client utilities
 """
 
 import os
+import sys
 import uuid
 
 import prettytable
@@ -67,3 +68,10 @@ def env(*vars, **kwargs):
         if value:
             return value
     return kwargs.get('default', '')
+
+
+def import_class(import_str):
+    """Returns a class from a string including module and class."""
+    mod_str, _sep, class_str = import_str.rpartition('.')
+    __import__(mod_str)
+    return getattr(sys.modules[mod_str], class_str)