Add debugging helper to pretty print history (#287)

Author: davidmrdavid

azure/durable_functions/models/DurableOrchestrationContext.py

@@ -1,7 +1,9 @@
 import json
 import datetime
+import inspect
 from typing import List, Any, Dict, Optional
 from uuid import UUID, uuid5, NAMESPACE_URL
+from datetime import timezone
 
 from .RetryOptions import RetryOptions
 from .TaskSet import TaskSet
@@ -459,3 +461,15 @@ def new_guid(self) -> UUID:
         self._new_uuid_counter += 1
         guid = uuid5(NAMESPACE_URL, guid_name)
         return guid
+
+    def _pretty_print_history(self) -> str:
+        """Get a pretty-printed version of the orchestration's internal history."""
+        def history_to_string(event):
+            json_dict = {}
+            for key, val in inspect.getmembers(event):
+                if not key.startswith('_') and not inspect.ismethod(val):
+                    if isinstance(val, datetime.date):
+                        val = val.replace(tzinfo=timezone.utc).timetuple()
+                    json_dict[key] = val
+            return json.dumps(json_dict)
+        return str(list(map(history_to_string, self._histories)))