Added Actuator Strategy

This strategy now allow us to create action plans with an explicit
set of actions.

Co-Authored-By: Mikhail Kizilov <kizilov.mikhail@gmail.com>
Change-Id: I7b04b9936ce5f3b5b38f319da7f8737e0f3eea88
Closes-Bug: #1659243

watcher/decision_engine/strategy/strategies/__init__.py

@@ -14,6 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from watcher.decision_engine.strategy.strategies import actuation
 from watcher.decision_engine.strategy.strategies import basic_consolidation
 from watcher.decision_engine.strategy.strategies import dummy_strategy
 from watcher.decision_engine.strategy.strategies import dummy_with_scorer
@@ -26,6 +27,7 @@ from watcher.decision_engine.strategy.strategies import \
 from watcher.decision_engine.strategy.strategies import workload_balance
 from watcher.decision_engine.strategy.strategies import workload_stabilization
 
+Actuator = actuation.Actuator
 BasicConsolidation = basic_consolidation.BasicConsolidation
 OutletTempControl = outlet_temp_control.OutletTempControl
 DummyStrategy = dummy_strategy.DummyStrategy
@@ -37,7 +39,7 @@ WorkloadStabilization = workload_stabilization.WorkloadStabilization
 UniformAirflow = uniform_airflow.UniformAirflow
 NoisyNeighbor = noisy_neighbor.NoisyNeighbor
 
-__all__ = ("BasicConsolidation", "OutletTempControl", "DummyStrategy",
-           "DummyWithScorer", "VMWorkloadConsolidation", "WorkloadBalance",
-           "WorkloadStabilization", "UniformAirflow", "NoisyNeighbor",
-           "SavingEnergy")
+__all__ = ("Actuator", "BasicConsolidation", "OutletTempControl",
+           "DummyStrategy", "DummyWithScorer", "VMWorkloadConsolidation",
+           "WorkloadBalance", "WorkloadStabilization", "UniformAirflow",
+           "NoisyNeighbor", "SavingEnergy")

watcher/decision_engine/strategy/strategies/actuation.py

@@ -0,0 +1,99 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2017 b<>com
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""
+*Actuator*
+
+This strategy allows anyone to create an action plan with a predefined set of
+actions. This strategy can be used for 2 different purposes:
+
+- Test actions
+- Use this strategy based on an event trigger to perform some explicit task
+
+"""
+
+from oslo_log import log
+
+from watcher._i18n import _
+from watcher.decision_engine.strategy.strategies import base
+
+LOG = log.getLogger(__name__)
+
+
+class Actuator(base.UnclassifiedStrategy):
+    """Actuator that simply executes the actions given as parameter"""
+
+    @classmethod
+    def get_name(cls):
+        return "actuator"
+
+    @classmethod
+    def get_display_name(cls):
+        return _("Actuator")
+
+    @classmethod
+    def get_translatable_display_name(cls):
+        return "Actuator"
+
+    @classmethod
+    def get_schema(cls):
+        # Mandatory default setting for each element
+        return {
+            "$schema": "http://json-schema.org/draft-04/schema#",
+            "type": "object",
+            "properties": {
+                "actions": {
+                    "type": "array",
+                    "items": {
+                        "type": "object",
+                        "properties": {
+                            "action_type": {
+                                "type": "string"
+                            },
+                            "resource_id": {
+                                "type": "string"
+                            },
+                            "input_parameters": {
+                                "type": "object",
+                                "properties": {},
+                                "additionalProperties": True
+                            }
+                        },
+                        "required": [
+                            "action_type", "input_parameters"
+                        ],
+                        "additionalProperties": True,
+                    }
+                }
+            },
+            "required": [
+                "actions"
+            ]
+        }
+
+    @property
+    def actions(self):
+        return self.input_parameters.get('actions', [])
+
+    def pre_execute(self):
+        LOG.info("Preparing Actuator strategy...")
+
+    def do_execute(self):
+        for action in self.actions:
+            self.solution.add_action(**action)
+
+    def post_execute(self):
+        pass