stable/freqtrade/rpc/api_server/ws/serializer.py
2022-11-19 13:21:26 -07:00

61 lines
1.6 KiB
Python

import logging
from abc import ABC, abstractmethod
from typing import Any, Dict, Union
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
from freqtrade.rpc.api_server.ws_schemas import WSMessageSchemaType
logger = logging.getLogger(__name__)
class WebSocketSerializer(ABC):
def __init__(self, websocket: WebSocketProxy):
self._websocket: WebSocketProxy = websocket
@abstractmethod
def _serialize(self, data):
raise NotImplementedError()
@abstractmethod
def _deserialize(self, data):
raise NotImplementedError()
async def send(self, data: Union[WSMessageSchemaType, Dict[str, Any]]):
await self._websocket.send(self._serialize(data))
async def recv(self) -> bytes:
data = await self._websocket.recv()
return self._deserialize(data)
class HybridJSONWebSocketSerializer(WebSocketSerializer):
def _serialize(self, data) -> str:
return str(orjson.dumps(data, default=_json_default), "utf-8")
def _deserialize(self, data: str):
# RapidJSON expects strings
return rapidjson.loads(data, object_hook=_json_object_hook)
# 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