Add continuously optimization

This patch set adds implementation for CONTINUOUS type
of audit.

Change-Id: I5f4ec97b2082c8a6b3ccebe36b2a343fa4a67d19
Implements: blueprint continuously-optimization

watcher/decision_engine/audit/base.py

@@ -2,6 +2,7 @@
 # Copyright (c) 2015 b<>com
 #
 # Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
+#          Alexander Chadin <a.chadin@servionica.ru>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -19,9 +20,92 @@
 import abc
 import six
 
+from oslo_log import log
+
+from watcher.common.messaging.events import event as watcher_event
+from watcher.decision_engine.messaging import events as de_events
+from watcher.decision_engine.planner import manager as planner_manager
+from watcher.decision_engine.strategy.context import default as default_context
+from watcher.objects import audit as audit_objects
+
+LOG = log.getLogger(__name__)
+
 
 @six.add_metaclass(abc.ABCMeta)
 class BaseAuditHandler(object):
     @abc.abstractmethod
     def execute(self, audit_uuid, request_context):
         raise NotImplementedError()
+
+    @abc.abstractmethod
+    def pre_execute(self, audit_uuid, request_context):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def do_execute(self, audit, request_context):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def post_execute(self, audit, solution, request_context):
+        raise NotImplementedError()
+
+
+@six.add_metaclass(abc.ABCMeta)
+class AuditHandler(BaseAuditHandler):
+    def __init__(self, messaging):
+        self._messaging = messaging
+        self._strategy_context = default_context.DefaultStrategyContext()
+        self._planner_manager = planner_manager.PlannerManager()
+        self._planner = None
+
+    @property
+    def planner(self):
+        if self._planner is None:
+            self._planner = self._planner_manager.load()
+        return self._planner
+
+    @property
+    def messaging(self):
+        return self._messaging
+
+    @property
+    def strategy_context(self):
+        return self._strategy_context
+
+    def notify(self, audit_uuid, event_type, status):
+        event = watcher_event.Event()
+        event.type = event_type
+        event.data = {}
+        payload = {'audit_uuid': audit_uuid,
+                   'audit_status': status}
+        self.messaging.status_topic_handler.publish_event(
+            event.type.name, payload)
+
+    def update_audit_state(self, request_context, audit, state):
+        LOG.debug("Update audit state: %s", state)
+        audit.state = state
+        audit.save()
+        self.notify(audit.uuid, de_events.Events.TRIGGER_AUDIT, state)
+
+    def pre_execute(self, audit, request_context):
+        LOG.debug("Trigger audit %s", audit.uuid)
+        # change state of the audit to ONGOING
+        self.update_audit_state(request_context, audit,
+                                audit_objects.State.ONGOING)
+
+    def post_execute(self, audit, solution, request_context):
+        self.planner.schedule(request_context, audit.id, solution)
+
+        # change state of the audit to SUCCEEDED
+        self.update_audit_state(request_context, audit,
+                                audit_objects.State.SUCCEEDED)
+
+    def execute(self, audit, request_context):
+        try:
+            self.pre_execute(audit, request_context)
+            solution = self.do_execute(audit, request_context)
+            self.post_execute(audit, solution, request_context)
+        except Exception as e:
+            LOG.exception(e)
+            self.update_audit_state(request_context, audit,
+                                    audit_objects.State.FAILED)