Add Ansible executor class for node context

import the AnsibleCommon class to execute Ansible playbooks

Update node context support to use AnsibleCommon

needs unittests

We must call ansible-playbook as an executable, so we must create temp
files for inventory, and for the playbooks.

AnsibleCommon has evolved to be quite flexible, it auto-generates the
inventory from the context['nodes'] and generates groups from the node
Role.

We also support either a single playbook filename, or a list of
filenames.

If given a list we dynamically generate a playbook that includes the
other playbooks.

We support adding any number of extra_vars using a temp JSON file.

Also designed to be extended by subclassing.

Change-Id: I5bd0a2b4547feaadd70b7e2b8801f19371b99df0
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/yardstick/common/utils.py b/yardstick/common/utils.py
index 729bc1db9..759f43d7c 100644
--- a/yardstick/common/utils.py
+++ b/yardstick/common/utils.py
@@ -18,6 +18,7 @@
 from __future__ import absolute_import
 from __future__ import print_function
 
+import datetime
 import errno
 import logging
 import os
@@ -382,3 +383,19 @@ class ErrorClass(object):
 
     def __getattr__(self, item):
         raise AttributeError
+
+
+class Timer(object):
+    def __init__(self):
+        super(Timer, self).__init__()
+        self.start = self.delta = None
+
+    def __enter__(self):
+        self.start = datetime.datetime.now()
+        return self
+
+    def __exit__(self, *_):
+        self.delta = datetime.datetime.now() - self.start
+
+    def __getattr__(self, item):
+        return getattr(self.delta, item)