Use common find_server from v2.shell

- extend v2.shell._find_server with raise_if_notfound param
- reuse v2.shell._find_server for instance_action extension
- fix instance-action-list on v2.21 (it was unable to work
  with deleted instances)

Change-Id: I7b538124c6ab0ee00164822b324aaf2d37c8c2af

novaclient/v2/contrib/instance_action.py

@@ -15,13 +15,11 @@
 
 import pprint
 
-import six
-
 from novaclient import api_versions
 from novaclient import base
-from novaclient import exceptions
 from novaclient.i18n import _
 from novaclient import utils
+from novaclient.v2 import shell
 
 
 class InstanceActionManager(base.ManagerWithFind):
@@ -44,23 +42,6 @@ class InstanceActionManager(base.ManagerWithFind):
                           base.getid(server), 'instanceActions')
 
 
-@api_versions.wraps("2.0", "2.20")
-def _find_server(cs, args):
-    return utils.find_resource(cs.servers, args.server)
-
-
-@api_versions.wraps("2.21")
-def _find_server(cs, args):
-    try:
-        return utils.find_resource(cs.servers, args.server,
-                                   wrap_exception=False)
-    except exceptions.NoUniqueMatch as e:
-        raise exceptions.CommandError(six.text_type(e))
-    except exceptions.NotFound:
-        # The server can be deleted
-        return args.server
-
-
 @utils.arg(
     'server',
     metavar='<server>',
@@ -78,7 +59,10 @@ def _find_server(cs, args):
     help=_('Request ID of the action to get.'))
 def do_instance_action(cs, args):
     """Show an action."""
-    server = _find_server(cs, args)
+    if cs.api_version < api_versions.APIVersion("2.21"):
+        server = shell._find_server(cs, args.server)
+    else:
+        server = shell._find_server(cs, args.server, raise_if_notfound=False)
     action_resource = cs.instance_action.get(server, args.request_id)
     action = action_resource._info
     if 'events' in action:
@@ -99,7 +83,10 @@ def do_instance_action(cs, args):
     start_version="2.21")
 def do_instance_action_list(cs, args):
     """List actions on a server."""
-    server = _find_server(cs, args)
+    if cs.api_version < api_versions.APIVersion("2.21"):
+        server = shell._find_server(cs, args.server)
+    else:
+        server = shell._find_server(cs, args.server, raise_if_notfound=False)
     actions = cs.instance_action.list(server)
     utils.print_list(actions,
                      ['Action', 'Request_ID', 'Message', 'Start_Time'],

novaclient/v2/shell.py

@@ -2156,9 +2156,25 @@ def do_delete(cs, args):
         _("Unable to delete the specified server(s)."))
 
 
-def _find_server(cs, server, **find_args):
-    """Get a server by name or ID."""
-    return utils.find_resource(cs.servers, server, **find_args)
+def _find_server(cs, server, raise_if_notfound=True, **find_args):
+    """Get a server by name or ID.
+
+    :param cs: NovaClient's instance
+    :param server: identifier of server
+    :param raise_if_notfound: raise an exception if server is not found
+    :param find_args: argument to search server
+    """
+    if raise_if_notfound:
+        return utils.find_resource(cs.servers, server, **find_args)
+    else:
+        try:
+            return utils.find_resource(cs.servers, server,
+                                       wrap_exception=False)
+        except exceptions.NoUniqueMatch as e:
+            raise exceptions.CommandError(six.text_type(e))
+        except exceptions.NotFound:
+            # The server can be deleted
+            return server
 
 
 def _find_image(cs, image):