Extend ProcessManagingEventHander with deployment failure detection

lib/tfw/components/process_managing_event_handler.py

@@ -1,4 +1,5 @@
 from functools import wraps
+from xmlrpc.client import Fault as SupervisorFault
 
 from tfw.event_handler_base import TriggerlessEventHandler
 from tfw.components.mixins import SupervisorMixin
@@ -37,6 +38,11 @@ class ProcessManagingEventHandler(TriggerlessEventHandler):
         try:
             data = data_json['data']
             self.processmanager(data['command'], data['process_name'])
+            data_json['data']['error'] = False
             return data_json
         except KeyError:
             log.error('IGNORING MESSAGE: Invalid data_json received: {}'.format(data_json))
+        except SupervisorFault:
+            data_json['data']['error'] = True
+            log.debug('Failed to execute command on process: {}'.format(data_json))
+            return data_json