Create get_description and get_scenario_type for Scenario

Created two new class functions for Scenario class:

* "get_description" will return the first line of the docstring,
  if exists.
* "get_scenario_type" will return the value of "__scenario_type__"
  variable.

Change-Id: I8e3b47e33e0bae101b874c3975bb9c383397d188
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

2 files changed, 17 insertions, 4 deletions

diff --git a/yardstick/benchmark/core/scenario.py b/yardstick/benchmark/core/scenario.py
index cd119c24c..28eb65230 100644
--- a/yardstick/benchmark/core/scenario.py
+++ b/yardstick/benchmark/core/scenario.py
@@ -10,7 +10,6 @@
 """ Handler for yardstick command 'scenario' """
 
 from __future__ import absolute_import
-from __future__ import print_function
 from yardstick.benchmark.scenarios.base import Scenario
 from yardstick.benchmark.core import print_hbar
 
@@ -27,9 +26,9 @@ class Scenarios(object):    # pragma: no cover
         print_hbar(78)
         print("| %-16s | %-60s" % ("Type", "Description"))
         print_hbar(78)
-        for stype in types:
-            print("| %-16s | %-60s" % (stype.__scenario_type__,
-                                       stype.__doc__.split("\n")[0]))
+        for scenario_class in types:
+            print("| %-16s | %-60s" % (scenario_class.get_scenario_type(),
+                                       scenario_class.get_description()))
         print_hbar(78)
 
     def show(self, args):
diff --git a/yardstick/benchmark/scenarios/base.py b/yardstick/benchmark/scenarios/base.py
index 3cb138dd8..7af85834c 100644
--- a/yardstick/benchmark/scenarios/base.py
+++ b/yardstick/benchmark/scenarios/base.py
@@ -64,6 +64,20 @@ class Scenario(object):
 
         raise RuntimeError("No such scenario type %s" % scenario_type)
 
+    @classmethod
+    def get_scenario_type(cls):
+        """Return a string with the scenario type, if defined"""
+        return str(getattr(cls, '__scenario_type__', None))
+
+    @classmethod
+    def get_description(cls):
+        """Return a single line string with the class description
+
+        This function will retrieve the class docstring and return the first
+        line, or 'None' if it's empty.
+        """
+        return cls.__doc__.splitlines()[0] if cls.__doc__ else str(None)
+
     def _push_to_outputs(self, keys, values):
         return dict(zip(keys, values))