rally-openstack/doc/source/plugins/implementation/scenario_plugin.rst

Scenario as a plugin

Let's create a simple scenario plugin that list flavors.

Creation

Inherit a class for your plugin from the base Scenario class and implement a scenario method inside it. In our scenario, we'll first list flavors as an ordinary user, and then repeat the same using admin clients:

from rally.task import atomic
from rally.task import scenario


class ScenarioPlugin(scenario.Scenario):
    """Sample plugin which lists flavors."""

    @atomic.action_timer("list_flavors")
    def _list_flavors(self):
        """Sample of usage clients - list flavors

        You can use self.context, self.admin_clients and self.clients which are
        initialized on scenario instance creation"""
        self.clients("nova").flavors.list()

    @atomic.action_timer("list_flavors_as_admin")
    def _list_flavors_as_admin(self):
        """The same with admin clients"""
        self.admin_clients("nova").flavors.list()

    @scenario.configure()
    def list_flavors(self):
        """List flavors."""
        self._list_flavors()
        self._list_flavors_as_admin()

Usage

You can refer to your plugin scenario in the benchmark task configuration files in the same way as any other scenarios:

{
    "ScenarioPlugin.list_flavors": [
        {
            "runner": {
                "type": "serial",
                "times": 5,
            },
            "context": {
                "create_flavor": {
                    "ram": 512,
                }
            }
        }
    ]
}

This configuration file uses the "create_flavor" context which we created in plugins_context_plugin.