Extract hyperopt_defaults_serializer to hyperopt_tools

freqtrade/optimize/hyperopt.py

@@ -29,7 +29,7 @@
 from freqtrade.optimize.hyperopt_auto import HyperOptAuto
 from freqtrade.optimize.hyperopt_interface import IHyperOpt  # noqa: F401
 from freqtrade.optimize.hyperopt_loss_interface import IHyperOptLoss  # noqa: F401
-from freqtrade.optimize.hyperopt_tools import HyperoptTools
+from freqtrade.optimize.hyperopt_tools import HyperoptTools, hyperopt_parser
 from freqtrade.optimize.optimize_reports import generate_strategy_stats
 from freqtrade.resolvers.hyperopt_resolver import HyperOptLossResolver, HyperOptResolver
 
@@ -163,13 +163,9 @@ def _save_result(self, epoch: Dict) -> None:
         While not a valid json object - this allows appending easily.
         :param epoch: result dictionary for this epoch.
         """
-        def default_parser(x):
-            if isinstance(x, np.integer):
-                return int(x)
-            return str(x)
         epoch[FTHYPT_FILEVERSION] = 2
         with self.results_file.open('a') as f:
-            rapidjson.dump(epoch, f, default=default_parser,
+            rapidjson.dump(epoch, f, default=hyperopt_parser,
                            number_mode=rapidjson.NM_NATIVE | rapidjson.NM_NAN)
             f.write("\n")
 

freqtrade/optimize/hyperopt_tools.py

@@ -2,9 +2,11 @@
 import io
 import logging
 from copy import deepcopy
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
+import numpy as np
 import rapidjson
 import tabulate
 from colorama import Fore, Style
@@ -20,6 +22,12 @@
 NON_OPT_PARAM_APPENDIX = "  # value loaded from strategy"
 
 
+def hyperopt_parser(x):
+    if isinstance(x, np.integer):
+        return int(x)
+    return str(x)
+
+
 class HyperoptTools():
 
     @staticmethod
@@ -48,9 +56,12 @@ def export_params(params, strategy_name: str, filename: Path):
             'strategy_name': strategy_name,
             'params': final_params,
             'ft_stratparam_v': 1,
+            'export_time': datetime.now(timezone.utc),
         }
         logger.info(f"Dumping parameters to {filename}")
-        rapidjson.dump(final_params, filename.open('w'), indent=2)
+        rapidjson.dump(final_params, filename.open('w'), indent=2,
+                       default=hyperopt_parser, number_mode=rapidjson.NM_NATIVE | rapidjson.NM_NAN
+                       )
 
     @staticmethod
     def try_export_params(config: Dict[str, Any], strategy_name: str, val: Dict):