129 lines
3.4 KiB
Python
129 lines
3.4 KiB
Python
import asyncio
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import logging
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from contextlib import asynccontextmanager
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from typing import Any, Dict, List, Optional, Type, Union
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from uuid import uuid4
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from freqtrade.rpc.api_server.ws.proxy import WebSocketProxy
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from freqtrade.rpc.api_server.ws.serializer import (HybridJSONWebSocketSerializer,
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WebSocketSerializer)
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from freqtrade.rpc.api_server.ws.types import WebSocketType
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from freqtrade.rpc.api_server.ws_schemas import WSMessageSchemaType
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logger = logging.getLogger(__name__)
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class WebSocketChannel:
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"""
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Object to help facilitate managing a websocket connection
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"""
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def __init__(
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self,
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websocket: WebSocketType,
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channel_id: Optional[str] = None,
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serializer_cls: Type[WebSocketSerializer] = HybridJSONWebSocketSerializer
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):
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self.channel_id = channel_id if channel_id else uuid4().hex[:8]
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self._websocket = WebSocketProxy(websocket)
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# Internal event to signify a closed websocket
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self._closed = asyncio.Event()
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# The subscribed message types
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self._subscriptions: List[str] = []
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# Wrap the WebSocket in the Serializing class
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self._wrapped_ws = serializer_cls(self._websocket)
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def __repr__(self):
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return f"WebSocketChannel({self.channel_id}, {self.remote_addr})"
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@property
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def raw_websocket(self):
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return self._websocket.raw_websocket
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@property
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def remote_addr(self):
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return self._websocket.remote_addr
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async def send(self, message: Union[WSMessageSchemaType, Dict[str, Any]]):
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"""
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Send a message on the wrapped websocket
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"""
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await self._wrapped_ws.send(message)
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async def recv(self):
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"""
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Receive a message on the wrapped websocket
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"""
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return await self._wrapped_ws.recv()
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async def ping(self):
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"""
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Ping the websocket
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"""
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return await self._websocket.ping()
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async def accept(self):
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"""
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Accept the underlying websocket connection
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"""
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return await self._websocket.accept()
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async def close(self):
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"""
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Close the WebSocketChannel
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"""
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self._closed.set()
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self._relay_task.cancel()
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try:
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await self._websocket.close()
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except Exception:
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pass
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def is_closed(self) -> bool:
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"""
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Closed flag
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"""
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return self._closed.is_set()
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def set_subscriptions(self, subscriptions: List[str] = []) -> None:
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"""
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Set which subscriptions this channel is subscribed to
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:param subscriptions: List of subscriptions, List[str]
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"""
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self._subscriptions = subscriptions
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def subscribed_to(self, message_type: str) -> bool:
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"""
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Check if this channel is subscribed to the message_type
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:param message_type: The message type to check
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"""
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return message_type in self._subscriptions
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async def __aiter__(self):
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"""
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Generator for received messages
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"""
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while True:
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try:
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yield await self.recv()
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except Exception:
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break
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@asynccontextmanager
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async def connect(self):
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"""
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Context manager for safely opening and closing the websocket connection
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"""
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try:
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await self.accept()
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yield self
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finally:
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await self.close()
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