Add Voluptuous to validate the action parameters

We want a simplest way to validate the input parameters of an
Action through a schema.

APIImpact
DocImpact
Partially implements: blueprint watcher-add-actions-via-conf

Change-Id: I139775f467fe7778c7354b0cfacf796fc27ffcb2

watcher/decision_engine/solution/base.py

@@ -87,13 +87,13 @@ class BaseSolution(object):
     @abc.abstractmethod
     def add_action(self,
                    action_type,
-                   applies_to,
+                   resource_id,
                    input_parameters=None):
         """Add a new Action in the Action Plan
 
         :param action_type: the unique id of an action type defined in
             entry point 'watcher_actions'
-        :param applies_to: the unique id of the resource to which the
+        :param resource_id: the unique id of the resource to which the
             `Action` applies.
         :param input_parameters: An array of input parameters provided as
             key-value pairs of strings. Each key-pair contains names and

watcher/decision_engine/solution/default.py

@@ -18,12 +18,14 @@
 #
 from oslo_log import log
 
-from watcher.decision_engine.solution.base import BaseSolution
+from watcher.applier.actions import base as baction
+from watcher.common import exception
+from watcher.decision_engine.solution import base
 
 LOG = log.getLogger(__name__)
 
 
-class DefaultSolution(BaseSolution):
+class DefaultSolution(base.BaseSolution):
     def __init__(self):
         """Stores a set of actions generated by a strategy
 
@@ -34,12 +36,17 @@ class DefaultSolution(BaseSolution):
         self._actions = []
 
     def add_action(self, action_type,
-                   applies_to,
-                   input_parameters=None):
-        # todo(jed) add https://pypi.python.org/pypi/schema
+                   input_parameters=None,
+                   resource_id=None):
+
+        if input_parameters is not None:
+            if baction.BaseAction.RESOURCE_ID in input_parameters.keys():
+                raise exception.ReservedWord(name=baction.BaseAction.
+                                             RESOURCE_ID)
+        if resource_id is not None:
+            input_parameters[baction.BaseAction.RESOURCE_ID] = resource_id
         action = {
             'action_type': action_type,
-            'applies_to': applies_to,
             'input_parameters': input_parameters
         }
         self._actions.append(action)