Slightly improve workflow trace logging

Change-Id: Ia5e8dd621cca67bafa8631252315e7617ffa8555

mistral/engine/actions.py

@@ -174,11 +174,16 @@ class Action(object):
 
             return "result = %s" % utils.cut(result.data)
 
-        wf_trace.info(
-            None,
-            "Action execution '%s' [%s -> %s, %s]" %
-            (self.action_ex.name, prev_state, state, _result_msg())
-        )
+        if prev_state != state:
+            wf_trace.info(
+                None,
+                "Action '%s' (%s) [%s -> %s, %s]" %
+                (self.action_ex.name,
+                 self.action_ex.id,
+                 prev_state,
+                 state,
+                 _result_msg())
+            )
 
 
 class PythonAction(Action):

mistral/engine/tasks.py

@@ -96,7 +96,7 @@ class Task(object):
         if not self.task_ex:
             self._create_task_execution()
 
-        self.set_state(states.WAITING, 'Task execution is deferred.')
+        self.set_state(states.WAITING, 'Task is deferred.')
 
         self.waiting = True
 
@@ -114,11 +114,17 @@ class Task(object):
 
         assert self.task_ex
 
-        wf_trace.info(
-            self.task_ex.workflow_execution,
-            "Task execution '%s' [%s -> %s]: %s" %
-            (self.task_ex.id, self.task_ex.state, state, state_info)
-        )
+        if (self.task_ex.state != state or
+                self.task_ex.state_info != state_info):
+            wf_trace.info(
+                self.task_ex.workflow_execution,
+                "Task '%s' (%s) [%s -> %s, msg=%s]" %
+                (self.task_ex.name,
+                 self.task_ex.id,
+                 self.task_ex.state,
+                 state,
+                 state_info)
+            )
 
         self.task_ex.state = state
         self.task_ex.state_info = state_info

mistral/engine/workflows.py

@@ -243,8 +243,8 @@ class Workflow(object):
 
             wf_trace.info(
                 self.wf_ex,
-                "Execution of workflow '%s' [%s -> %s]"
-                % (self.wf_ex.workflow_name, cur_state, state)
+                "Workflow '%s' [%s -> %s, msg=%s]"
+                % (self.wf_ex.workflow_name, cur_state, state, state_info)
             )
         else:
             msg = ("Can't change workflow execution state from %s to %s. "