244 lines
7.4 KiB
Python
244 lines
7.4 KiB
Python
import asyncio
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import logging
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import time
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from collections import deque
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from contextlib import asynccontextmanager
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from typing import Any, AsyncIterator, Deque, Dict, List, Optional, Type, Union
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from uuid import uuid4
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from fastapi import WebSocketDisconnect
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from websockets.exceptions import ConnectionClosed
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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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send_throttle: float = 0.01
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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 async tasks created for the channel
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self._channel_tasks: List[asyncio.Task] = []
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# Deque for average send times
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self._send_times: Deque[float] = deque([], maxlen=10)
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# High limit defaults to 3 to start
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self._send_high_limit = 3
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self._send_throttle = send_throttle
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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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@property
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def avg_send_time(self):
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return sum(self._send_times) / len(self._send_times)
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def _calc_send_limit(self):
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"""
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Calculate the send high limit for this channel
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"""
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# Only update if we have enough data
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if len(self._send_times) == self._send_times.maxlen:
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# At least 1s or twice the average of send times, with a
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# maximum of 3 seconds per message
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self._send_high_limit = min(max(self.avg_send_time * 2, 1), 3)
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async def send(
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self,
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message: Union[WSMessageSchemaType, Dict[str, Any]],
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timeout: bool = False
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):
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"""
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Send a message on the wrapped websocket. If the sending
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takes too long, it will raise a TimeoutError and
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disconnect the connection.
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:param message: The message to send
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:param timeout: Enforce send high limit, defaults to False
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"""
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try:
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_ = time.time()
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# If the send times out, it will raise
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# a TimeoutError and bubble up to the
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# message_endpoint to close the connection
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await asyncio.wait_for(
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self._wrapped_ws.send(message),
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timeout=self._send_high_limit if timeout else None
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)
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total_time = time.time() - _
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self._send_times.append(total_time)
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self._calc_send_limit()
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except asyncio.TimeoutError:
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logger.info(f"Connection for {self} timed out, disconnecting")
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raise
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# Explicitly give control back to event loop as
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# websockets.send does not
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# Also throttles how fast we send
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await asyncio.sleep(self._send_throttle)
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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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if the connection has been closed before we can
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accept, just close the channel.
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"""
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try:
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return await self._websocket.accept()
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except RuntimeError:
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await self.close()
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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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try:
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await self._websocket.close()
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except RuntimeError:
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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 run_channel_tasks(self, *tasks, **kwargs):
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"""
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Create and await on the channel tasks unless an exception
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was raised, then cancel them all.
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:params *tasks: All coros or tasks to be run concurrently
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:param **kwargs: Any extra kwargs to pass to gather
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"""
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if not self.is_closed():
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# Wrap the coros into tasks if they aren't already
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self._channel_tasks = [
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task if isinstance(task, asyncio.Task) else asyncio.create_task(task)
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for task in tasks
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]
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try:
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return await asyncio.gather(*self._channel_tasks, **kwargs)
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except Exception:
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# If an exception occurred, cancel the rest of the tasks
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await self.cancel_channel_tasks()
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async def cancel_channel_tasks(self):
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"""
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Cancel and wait on all channel tasks
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"""
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for task in self._channel_tasks:
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task.cancel()
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# Wait for tasks to finish cancelling
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try:
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await task
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except (
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asyncio.CancelledError,
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asyncio.TimeoutError,
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WebSocketDisconnect,
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ConnectionClosed,
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RuntimeError
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):
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pass
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except Exception as e:
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logger.info(f"Encountered unknown exception: {e}", exc_info=e)
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self._channel_tasks = []
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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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# We can not catch any errors here as websocket.recv is
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# the first to catch any disconnects and bubble it up
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# so the connection is garbage collected right away
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while not self.is_closed():
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yield await self.recv()
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@asynccontextmanager
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async def create_channel(
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websocket: WebSocketType,
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**kwargs
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) -> AsyncIterator[WebSocketChannel]:
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"""
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Context manager for safely opening and closing a WebSocketChannel
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"""
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channel = WebSocketChannel(websocket, **kwargs)
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try:
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await channel.accept()
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logger.info(f"Connected to channel - {channel}")
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yield channel
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finally:
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await channel.close()
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logger.info(f"Disconnected from channel - {channel}")
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