TMSS-483: added try_schedule_subtask method which puts a subtask-in-error back...

TMSS-483: added try_schedule_subtask method which puts a subtask-in-error back to defined after an unsuccessfull attempt

SAS/TMSS/client/lib/tmss_http_rest_client.py

@@ -327,6 +327,18 @@ class TMSSsession(object):
         returns the scheduled subtask upon success, or raises."""
         return self.get_path_as_json_object('subtask/%s/schedule' % subtask_id)
 
+    def try_schedule_subtask(self, subtask_id: int) -> {}:
+        """try to schedule the subtask for the given subtask_id.
+        returns the scheduled subtask upon success.
+        resets the subtask's state if it ends up in error state."""
+        try:
+            return self.get_path_as_json_object('subtask/%s/schedule' % subtask_id)
+        except Exception as e:
+            logger.error(str(e))
+            subtask = self.get_subtask(subtask_id)
+            if subtask['state_value'] == 'error':
+                self.set_subtask_status(subtask_id, 'defined')
+
     def get_subtask_progress(self, subtask_id: int) -> {}:
         """get the progress [0.0, 1.0] of a running subtask.
         returns a dict with the 'id' and 'progress', or raises."""