stable/freqtrade/rpc/api_server/api_ws.py

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import logging
from typing import Any, Dict
from fastapi import APIRouter, Depends, WebSocket, WebSocketDisconnect
# fastapi does not make this available through it, so import directly from starlette
from starlette.websockets import WebSocketState
from freqtrade.enums import RPCMessageType, RPCRequestType
from freqtrade.rpc.api_server.deps import get_channel_manager, get_rpc
from freqtrade.rpc.api_server.ws.channel import WebSocketChannel
from freqtrade.rpc.rpc import RPC
logger = logging.getLogger(__name__)
# Private router, protected by API Key authentication
router = APIRouter()
async def is_websocket_alive(ws: WebSocket) -> bool:
if (
ws.application_state == WebSocketState.CONNECTED and
ws.client_state == WebSocketState.CONNECTED
):
return True
return False
async def _process_consumer_request(
request: Dict[str, Any],
channel: WebSocketChannel,
rpc: RPC
):
type, data = request.get('type'), request.get('data')
logger.debug(f"Request of type {type} from {channel}")
# If we have a request of type SUBSCRIBE, set the topics in this channel
if type == RPCRequestType.SUBSCRIBE:
# If the request is empty, do nothing
if not data:
return
if not isinstance(data, list):
logger.error(f"Improper subscribe request from channel: {channel} - {request}")
return
# If all topics passed are a valid RPCMessageType, set subscriptions on channel
if all([any(x.value == topic for x in RPCMessageType) for topic in data]):
logger.debug(f"{channel} subscribed to topics: {data}")
channel.set_subscriptions(data)
elif type == RPCRequestType.WHITELIST:
# They requested the whitelist
whitelist = rpc._ws_request_whitelist()
await channel.send({"type": RPCMessageType.WHITELIST, "data": whitelist})
elif type == RPCRequestType.ANALYZED_DF:
limit = None
if data:
# Limit the amount of candles per dataframe to 'limit' or 1500
limit = max(data.get('limit', 500), 1500)
# They requested the full historical analyzed dataframes
analyzed_df = rpc._ws_request_analyzed_df(limit)
# For every dataframe, send as a separate message
for _, message in analyzed_df.items():
await channel.send({"type": RPCMessageType.ANALYZED_DF, "data": message})
@router.websocket("/message/ws")
async def message_endpoint(
ws: WebSocket,
rpc: RPC = Depends(get_rpc),
channel_manager=Depends(get_channel_manager),
):
try:
if is_websocket_alive(ws):
# TODO:
# Return a channel ID, pass that instead of ws to the rest of the methods
channel = await channel_manager.on_connect(ws)
logger.info(f"Consumer connected - {channel}")
2022-08-31 01:21:34 +00:00
# Keep connection open until explicitly closed, and process requests
try:
while not channel.is_closed():
request = await channel.recv()
# Process the request here
await _process_consumer_request(request, channel, rpc)
except WebSocketDisconnect:
# Handle client disconnects
logger.info(f"Consumer disconnected - {channel}")
await channel_manager.on_disconnect(ws)
except Exception as e:
logger.info(f"Consumer connection failed - {channel}")
logger.exception(e)
# Handle cases like -
# RuntimeError('Cannot call "send" once a closed message has been sent')
await channel_manager.on_disconnect(ws)
except Exception as e:
logger.error(f"Failed to serve - {ws.client}")
# Log tracebacks to keep track of what errors are happening
logger.exception(e)
await channel_manager.on_disconnect(ws)