fix dataframe serializing

freqtrade/data/dataprovider.py

@@ -17,7 +17,6 @@ from freqtrade.data.history import load_pair_history
 from freqtrade.enums import CandleType, RPCMessageType, RunMode
 from freqtrade.exceptions import ExchangeError, OperationalException
 from freqtrade.exchange import Exchange, timeframe_to_seconds
-from freqtrade.misc import dataframe_to_json
 from freqtrade.rpc import RPCManager
 from freqtrade.util import PeriodicCache
 
@@ -119,7 +118,7 @@ class DataProvider:
                     'type': RPCMessageType.ANALYZED_DF,
                     'data': {
                         'key': pair_key,
-                        'value': dataframe_to_json(dataframe)
+                        'value': dataframe
                     }
                 }
             )

freqtrade/misc.py

@@ -269,7 +269,8 @@ def json_to_dataframe(data: str) -> pandas.DataFrame:
     :returns: A pandas DataFrame from the JSON string
     """
     dataframe = pandas.read_json(data)
-    dataframe['date'] = pandas.to_datetime(dataframe['date'], unit='ms', utc=True)
+    if 'date' in dataframe.columns:
+        dataframe['date'] = pandas.to_datetime(dataframe['date'], unit='ms', utc=True)
 
     return dataframe
 

freqtrade/rpc/api_server/ws/channel.py

@@ -3,7 +3,7 @@ from threading import RLock
 from typing import List, Type
 
 from freqtrade.rpc.api_server.ws.proxy import WebSocketProxy
-from freqtrade.rpc.api_server.ws.serializer import ORJSONWebSocketSerializer, WebSocketSerializer
+from freqtrade.rpc.api_server.ws.serializer import RapidJSONWebSocketSerializer, WebSocketSerializer
 from freqtrade.rpc.api_server.ws.types import WebSocketType
 
 
@@ -18,7 +18,7 @@ class WebSocketChannel:
     def __init__(
         self,
         websocket: WebSocketType,
-        serializer_cls: Type[WebSocketSerializer] = ORJSONWebSocketSerializer
+        serializer_cls: Type[WebSocketSerializer] = RapidJSONWebSocketSerializer
     ):
         # The WebSocket object
         self._websocket = WebSocketProxy(websocket)

freqtrade/rpc/api_server/ws/serializer.py

@@ -3,8 +3,10 @@ import logging
 from abc import ABC, abstractmethod
 
 import msgpack
-import orjson
+import rapidjson
+from pandas import DataFrame
 
+from freqtrade.misc import dataframe_to_json, json_to_dataframe
 from freqtrade.rpc.api_server.ws.proxy import WebSocketProxy
 
 
@@ -34,27 +36,23 @@ class WebSocketSerializer(ABC):
     async def close(self, code: int = 1000):
         await self._websocket.close(code)
 
-# Going to explore using MsgPack as the serialization,
-# as that might be the best method for sending pandas
-# dataframes over the wire
-
 
 class JSONWebSocketSerializer(WebSocketSerializer):
     def _serialize(self, data):
-        return json.dumps(data)
+        return json.dumps(data, default=_json_default)
 
     def _deserialize(self, data):
-        return json.loads(data)
+        return json.loads(data, object_hook=_json_object_hook)
 
 
-class ORJSONWebSocketSerializer(WebSocketSerializer):
+# ORJSON does not support .loads(object_hook=x) parameter, so we must use RapidJSON
-    ORJSON_OPTIONS = orjson.OPT_NAIVE_UTC | orjson.OPT_SERIALIZE_NUMPY
 
+class RapidJSONWebSocketSerializer(WebSocketSerializer):
     def _serialize(self, data):
-        return orjson.dumps(data, option=self.ORJSON_OPTIONS)
+        return rapidjson.dumps(data, default=_json_default)
 
     def _deserialize(self, data):
-        return orjson.loads(data)
+        return rapidjson.loads(data, object_hook=_json_object_hook)
 
 
 class MsgPackWebSocketSerializer(WebSocketSerializer):
@@ -63,3 +61,20 @@ class MsgPackWebSocketSerializer(WebSocketSerializer):
 
     def _deserialize(self, data):
         return msgpack.unpackb(data, raw=False)
+
+
+# Support serializing pandas DataFrames
+def _json_default(z):
+    if isinstance(z, DataFrame):
+        return {
+            '__type__': 'dataframe',
+            '__value__': dataframe_to_json(z)
+        }
+    raise TypeError
+
+
+# Support deserializing JSON to pandas DataFrames
+def _json_object_hook(z):
+    if z.get('__type__') == 'dataframe':
+        return json_to_dataframe(z.get('__value__'))
+    return z

freqtrade/rpc/external_message_consumer.py

@@ -10,11 +10,12 @@ import socket
 from threading import Thread
 from typing import Any, Dict, Optional
 
+import pandas
 import websockets
 
 from freqtrade.data.dataprovider import DataProvider
 from freqtrade.enums import RPCMessageType, RPCRequestType
-from freqtrade.misc import json_to_dataframe, remove_entry_exit_signals
+from freqtrade.misc import remove_entry_exit_signals
 from freqtrade.rpc.api_server.ws.channel import WebSocketChannel
 
 
@@ -262,11 +263,9 @@ class ExternalMessageConsumer:
 
         key, value = message_data.get('key'), message_data.get('value')
 
-        if key and value:
+        if key and isinstance(value, pandas.DataFrame):
             pair, timeframe, candle_type = key
-
+            dataframe = value
-            # Convert the JSON to a pandas DataFrame
-            dataframe = json_to_dataframe(value)
 
             # If set, remove the Entry and Exit signals from the Producer
             if self._emc_config.get('remove_entry_exit_signals', False):

freqtrade/rpc/rpc.py

@@ -24,7 +24,7 @@ from freqtrade.enums import (CandleType, ExitCheckTuple, ExitType, SignalDirecti
 from freqtrade.exceptions import ExchangeError, PricingError
 from freqtrade.exchange import timeframe_to_minutes, timeframe_to_msecs
 from freqtrade.loggers import bufferHandler
-from freqtrade.misc import dataframe_to_json, decimals_per_coin, shorten_date
+from freqtrade.misc import decimals_per_coin, shorten_date
 from freqtrade.persistence import PairLocks, Trade
 from freqtrade.persistence.models import PairLock
 from freqtrade.plugins.pairlist.pairlist_helpers import expand_pairlist
@@ -1064,10 +1064,7 @@ class RPC:
 
         for pair in pairlist:
             dataframe, last_analyzed = self.__rpc_analysed_dataframe_raw(pair, timeframe, limit)
-            _data[pair] = {
+            _data[pair] = {"key": (pair, timeframe, candle_type), "value": dataframe}
-                "key": (pair, timeframe, candle_type),
-                "value": dataframe_to_json(dataframe)
-            }
 
         return _data