add action attribute to CheckpointInput

Author: me

amazon_kclpy/messages.py

@@ -333,13 +333,15 @@ def __init__(self, json_dict):
         * subSequenceNumber
 
         The provided dictionary can optionally contain:
+        * action
         * error
 
         :param dict json_dict:
         """
         self._sequence_number = json_dict["sequenceNumber"]
         self._sub_sequence_number = json_dict["subSequenceNumber"]
         self._error = json_dict.get("error", None)
+        self._action = json_dict.get("action", "checkpoint")
 
     @property
     def sequence_number(self):
@@ -373,6 +375,16 @@ def error(self):
         """
         return self._error
 
+    @property
+    def action(self):
+        """
+        The action that spawned this message
+
+        :return: the original action value
+        :rtype: str
+        """
+        return self._action
+
 
 class Record(object):
     """