Add HA support

This patch set adds hostname field to Audit and Action Plan
objects to track services which execute these objects.

Change-Id: I786e419952925c380c969b12cc60f9a1004af96b
Partially-Implements: blueprint support-watcher-ha-active-active-mode

watcher/applier/action_plan/default.py

@@ -16,6 +16,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+from oslo_config import cfg
 from oslo_log import log
 
 from watcher.applier.action_plan import base
@@ -25,6 +26,7 @@ from watcher import notifications
 from watcher import objects
 from watcher.objects import fields
 
+CONF = cfg.CONF
 LOG = log.getLogger(__name__)
 
 
@@ -43,6 +45,7 @@ class DefaultActionPlanHandler(base.BaseActionPlanHandler):
             if action_plan.state == objects.action_plan.State.CANCELLED:
                 self._update_action_from_pending_to_cancelled()
                 return
+            action_plan.hostname = CONF.host
             action_plan.state = objects.action_plan.State.ONGOING
             action_plan.save()
             notifications.action_plan.send_action_notification(

watcher/applier/sync.py

@@ -15,12 +15,19 @@
 # limitations under the License.
 #
 
+from oslo_config import cfg
+from oslo_log import log
+
 from watcher.applier.loading import default
 from watcher.common import context
 from watcher.common import exception
 from watcher import objects
 
 
+CONF = cfg.CONF
+LOG = log.getLogger(__name__)
+
+
 class Syncer(object):
     """Syncs all available actions with the Watcher DB"""
 
@@ -42,3 +49,27 @@ class Syncer(object):
                 obj_action_desc.action_type = action_type
                 obj_action_desc.description = load_description
                 obj_action_desc.create()
+        self._cancel_ongoing_actionplans(ctx)
+
+    def _cancel_ongoing_actionplans(self, context):
+        actions_plans = objects.ActionPlan.list(
+            context,
+            filters={'state': objects.action_plan.State.ONGOING,
+                     'hostname': CONF.host},
+            eager=True)
+        for ap in actions_plans:
+            ap.state = objects.action_plan.State.CANCELLED
+            ap.save()
+            filters = {'action_plan_uuid': ap.uuid,
+                       'state__in': (objects.action.State.PENDING,
+                                     objects.action.State.ONGOING)}
+            actions = objects.Action.list(context, filters=filters, eager=True)
+            for a in actions:
+                a.state = objects.action.State.CANCELLED
+                a.save()
+            LOG.info("Action Plan %(uuid)s along with appropriate Actions "
+                     "has been cancelled because it was in %(state)s state "
+                     "when Applier had been stopped on %(hostname)s host.",
+                     {'uuid': ap.uuid,
+                      'state': objects.action_plan.State.ONGOING,
+                      'hostname': ap.hostname})