1 # Copyright 2013: Mirantis Inc.
4 # Licensed under the Apache License, Version 2.0 (the "License"); you may
5 # not use this file except in compliance with the License. You may obtain
6 # a copy of the License at
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 # License for the specific language governing permissions and limitations
20 from stevedore import extension
22 import yardstick.common.utils as utils
25 def _iter_scenario_classes(scenario_type=None):
26 """Generator over all 'Scenario' subclasses
28 This function will iterate over all 'Scenario' subclasses defined in this
29 project and will load any class introduced by any installed plugin project,
30 defined in 'entry_points' section, under 'yardstick.scenarios' subsection.
32 extension.ExtensionManager(namespace='yardstick.scenarios',
34 for scenario in utils.itersubclasses(Scenario):
37 elif getattr(scenario, '__scenario_type__', None) == scenario_type:
41 @six.add_metaclass(abc.ABCMeta)
42 class Scenario(object):
45 """Default setup implementation for Scenario classes"""
50 """Entry point for scenario classes, called from runner worker"""
53 """Default teardown implementation for Scenario classes"""
56 def pre_run_wait_time(self, time_seconds):
57 """Time waited before executing the run method"""
60 def post_run_wait_time(self, time_seconds):
61 """Time waited after executing the run method"""
62 time.sleep(time_seconds)
66 """return a list of known runner type (class) names"""
68 for scenario in _iter_scenario_classes():
69 scenarios.append(scenario)
73 def get_cls(scenario_type):
74 """return class of specified type"""
75 for scenario in _iter_scenario_classes(scenario_type):
78 raise RuntimeError("No such scenario type %s" % scenario_type)
81 def get(scenario_type):
82 """Returns instance of a scenario runner for execution type.
84 scenario = Scenario.get_cls(scenario_type)
85 return scenario.__module__ + "." + scenario.__name__
88 def get_scenario_type(cls):
89 """Return a string with the scenario type, if defined"""
90 return str(getattr(cls, '__scenario_type__', None))
93 def get_description(cls):
94 """Return a single line string with the class description
96 This function will retrieve the class docstring and return the first
97 line, or 'None' if it's empty.
99 return cls.__doc__.splitlines()[0] if cls.__doc__ else str(None)
102 def _push_to_outputs(keys, values):
103 """Return a dictionary given the keys and the values"""
104 return dict(zip(keys, values))
107 def _change_obj_to_dict(obj):
108 """Return a dictionary from the __dict__ attribute of an object"""
110 for k, v in vars(obj).items():