146 lines
4.1 KiB
Python
146 lines
4.1 KiB
Python
import logging
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from threading import RLock
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from typing import Type
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from freqtrade.rpc.external_signal.proxy import WebSocketProxy
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from freqtrade.rpc.external_signal.serializer import MsgPackWebSocketSerializer, WebSocketSerializer
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from freqtrade.rpc.external_signal.types import WebSocketType
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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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serializer_cls: Type[WebSocketSerializer] = MsgPackWebSocketSerializer
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):
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# The WebSocket object
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self._websocket = WebSocketProxy(websocket)
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# The Serializing class for the WebSocket object
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self._serializer_cls = serializer_cls
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# Internal event to signify a closed websocket
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self._closed = False
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# Wrap the WebSocket in the Serializing class
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self._wrapped_ws = self._serializer_cls(self._websocket)
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async def send(self, data):
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"""
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Send data on the wrapped websocket
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"""
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# logger.info(f"Serialized Send - {self._wrapped_ws._serialize(data)}")
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await self._wrapped_ws.send(data)
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async def recv(self):
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"""
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Receive data 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 close(self):
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"""
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Close the WebSocketChannel
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"""
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self._closed = True
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def is_closed(self):
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return self._closed
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class ChannelManager:
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def __init__(self):
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self.channels = dict()
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self._lock = RLock() # Re-entrant Lock
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async def on_connect(self, websocket: WebSocketType):
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"""
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Wrap websocket connection into Channel and add to list
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:param websocket: The WebSocket object to attach to the Channel
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"""
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if hasattr(websocket, "accept"):
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try:
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await websocket.accept()
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except RuntimeError:
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# The connection was closed before we could accept it
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return
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ws_channel = WebSocketChannel(websocket)
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with self._lock:
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self.channels[websocket] = ws_channel
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return ws_channel
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async def on_disconnect(self, websocket: WebSocketType):
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"""
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Call close on the channel if it's not, and remove from channel list
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:param websocket: The WebSocket objet attached to the Channel
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"""
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with self._lock:
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channel = self.channels.get(websocket)
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if channel:
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logger.debug(f"Disconnecting channel - {channel}")
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if not channel.is_closed():
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await channel.close()
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del self.channels[websocket]
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async def disconnect_all(self):
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"""
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Disconnect all Channels
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"""
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with self._lock:
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for websocket, channel in self.channels.items():
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if not channel.is_closed():
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await channel.close()
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self.channels = dict()
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async def broadcast(self, data):
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"""
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Broadcast data on all Channels
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:param data: The data to send
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"""
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with self._lock:
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for websocket, channel in self.channels.items():
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try:
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await channel.send(data)
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except RuntimeError:
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# Handle cannot send after close cases
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await self.on_disconnect(websocket)
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async def send_direct(self, channel, data):
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"""
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Send data directly through direct_channel only
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:param direct_channel: The WebSocketChannel object to send data through
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:param data: The data to send
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"""
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# We iterate over the channels to get reference to the websocket object
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# so we can disconnect incase of failure
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await channel.send(data)
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def has_channels(self):
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"""
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Flag for more than 0 channels
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"""
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return len(self.channels) > 0
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