139 lines
4.6 KiB
Python
139 lines
4.6 KiB
Python
import logging
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from typing import Any, Dict
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from fastapi import APIRouter, Depends, WebSocketDisconnect
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from fastapi.websockets import WebSocket, WebSocketState
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from pydantic import ValidationError
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from websockets.exceptions import WebSocketException
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from freqtrade.enums import RPCMessageType, RPCRequestType
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from freqtrade.rpc.api_server.api_auth import validate_ws_token
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from freqtrade.rpc.api_server.deps import get_channel_manager, get_rpc
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from freqtrade.rpc.api_server.ws import WebSocketChannel
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from freqtrade.rpc.api_server.ws.channel import ChannelManager
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from freqtrade.rpc.api_server.ws_schemas import (WSAnalyzedDFMessage, WSMessageSchema,
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WSRequestSchema, WSWhitelistMessage)
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from freqtrade.rpc.rpc import RPC
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logger = logging.getLogger(__name__)
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# Private router, protected by API Key authentication
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router = APIRouter()
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async def is_websocket_alive(ws: WebSocket) -> bool:
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"""
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Check if a FastAPI Websocket is still open
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"""
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if (
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ws.application_state == WebSocketState.CONNECTED and
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ws.client_state == WebSocketState.CONNECTED
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):
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return True
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return False
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async def _process_consumer_request(
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request: Dict[str, Any],
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channel: WebSocketChannel,
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rpc: RPC,
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channel_manager: ChannelManager
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):
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"""
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Validate and handle a request from a websocket consumer
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"""
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# Validate the request, makes sure it matches the schema
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try:
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websocket_request = WSRequestSchema.parse_obj(request)
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except ValidationError as e:
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logger.error(f"Invalid request from {channel}: {e}")
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return
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type, data = websocket_request.type, websocket_request.data
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response: WSMessageSchema
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logger.debug(f"Request of type {type} from {channel}")
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# If we have a request of type SUBSCRIBE, set the topics in this channel
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if type == RPCRequestType.SUBSCRIBE:
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# If the request is empty, do nothing
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if not data:
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return
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# If all topics passed are a valid RPCMessageType, set subscriptions on channel
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if all([any(x.value == topic for x in RPCMessageType) for topic in data]):
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channel.set_subscriptions(data)
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# We don't send a response for subscriptions
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return
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elif type == RPCRequestType.WHITELIST:
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# Get whitelist
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whitelist = rpc._ws_request_whitelist()
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# Format response
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response = WSWhitelistMessage(data=whitelist)
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# Send it back
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await channel_manager.send_direct(channel, response.dict(exclude_none=True))
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elif type == RPCRequestType.ANALYZED_DF:
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limit = None
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if data:
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# Limit the amount of candles per dataframe to 'limit' or 1500
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limit = max(data.get('limit', 1500), 1500)
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# For every pair in the generator, send a separate message
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for message in rpc._ws_request_analyzed_df(limit):
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response = WSAnalyzedDFMessage(data=message)
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await channel_manager.send_direct(channel, response.dict(exclude_none=True))
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@router.websocket("/message/ws")
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async def message_endpoint(
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ws: WebSocket,
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rpc: RPC = Depends(get_rpc),
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channel_manager=Depends(get_channel_manager),
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token: str = Depends(validate_ws_token)
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):
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"""
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Message WebSocket endpoint, facilitates sending RPC messages
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"""
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try:
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channel = await channel_manager.on_connect(ws)
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if await is_websocket_alive(ws):
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logger.info(f"Consumer connected - {channel}")
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# Keep connection open until explicitly closed, and process requests
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try:
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while not channel.is_closed():
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request = await channel.recv()
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# Process the request here
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await _process_consumer_request(request, channel, rpc, channel_manager)
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except (WebSocketDisconnect, WebSocketException):
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# Handle client disconnects
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logger.info(f"Consumer disconnected - {channel}")
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except RuntimeError:
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# Handle cases like -
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# RuntimeError('Cannot call "send" once a closed message has been sent')
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pass
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except Exception as e:
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logger.info(f"Consumer connection failed - {channel}: {e}")
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logger.debug(e, exc_info=e)
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except RuntimeError:
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# WebSocket was closed
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# Do nothing
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pass
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except Exception as e:
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logger.error(f"Failed to serve - {ws.client}")
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# Log tracebacks to keep track of what errors are happening
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logger.exception(e)
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finally:
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if channel:
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await channel_manager.on_disconnect(ws)
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