Add audit type: event

This patchset added a new audit type: event,
and the handler to execute event audit.

Partially Implements: blueprint event-driven-optimization-based

Change-Id: I287471ee4d1dcc42af7a6bcc15f8509d4ce73072

watcher/decision_engine/audit/event.py

@@ -0,0 +1,27 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2019 ZTE Corporation
+#
+# 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.
+
+from watcher.decision_engine.audit import base
+from watcher import objects
+
+
+class EventAuditHandler(base.AuditHandler):
+
+    def post_execute(self, audit, solution, request_context):
+        super(EventAuditHandler, self).post_execute(audit, solution,
+                                                    request_context)
+        # change state of the audit to SUCCEEDED
+        self.update_audit_state(audit, objects.audit.State.SUCCEEDED)

watcher/decision_engine/messaging/audit_endpoint.py

@@ -22,6 +22,7 @@ from oslo_config import cfg
 from oslo_log import log
 
 from watcher.decision_engine.audit import continuous as c_handler
+from watcher.decision_engine.audit import event as e_handler
 from watcher.decision_engine.audit import oneshot as o_handler
 
 from watcher import objects
@@ -38,6 +39,7 @@ class AuditEndpoint(object):
             max_workers=CONF.watcher_decision_engine.max_audit_workers)
         self._oneshot_handler = o_handler.OneShotAuditHandler()
         self._continuous_handler = c_handler.ContinuousAuditHandler().start()
+        self._event_handler = e_handler.EventAuditHandler()
 
     @property
     def executor(self):
@@ -45,7 +47,10 @@ class AuditEndpoint(object):
 
     def do_trigger_audit(self, context, audit_uuid):
         audit = objects.Audit.get_by_uuid(context, audit_uuid, eager=True)
-        self._oneshot_handler.execute(audit, context)
+        if audit.audit_type == objects.audit.AuditType.ONESHOT.value:
+            self._oneshot_handler.execute(audit, context)
+        if audit.audit_type == objects.audit.AuditType.EVENT.value:
+            self._event_handler.execute(audit, context)
 
     def trigger_audit(self, context, audit_uuid):
         LOG.debug("Trigger audit %s", audit_uuid)

watcher/objects/audit.py

@@ -75,6 +75,7 @@ class State(object):
 class AuditType(enum.Enum):
     ONESHOT = 'ONESHOT'
     CONTINUOUS = 'CONTINUOUS'
+    EVENT = 'EVENT'
 
 
 @base.WatcherObjectRegistry.register