stable/freqtrade/rpc/api_server/ws/channel.py
2022-10-22 19:02:05 -06:00

223 lines
6.3 KiB
Python

import asyncio
import logging
from threading import RLock
from typing import Any, Dict, List, Optional, Type
from uuid import uuid4
from fastapi import WebSocket as FastAPIWebSocket
from freqtrade.rpc.api_server.ws.proxy import WebSocketProxy
from freqtrade.rpc.api_server.ws.serializer import (HybridJSONWebSocketSerializer,
WebSocketSerializer)
from freqtrade.rpc.api_server.ws.types import WebSocketType
logger = logging.getLogger(__name__)
class WebSocketChannel:
"""
Object to help facilitate managing a websocket connection
"""
def __init__(
self,
websocket: WebSocketType,
channel_id: Optional[str] = None,
drain_timeout: int = 3,
throttle: float = 0.01,
serializer_cls: Type[WebSocketSerializer] = HybridJSONWebSocketSerializer
):
self.channel_id = channel_id if channel_id else uuid4().hex[:8]
# The WebSocket object
self._websocket = WebSocketProxy(websocket)
# The Serializing class for the WebSocket object
self._serializer_cls = serializer_cls
self.drain_timeout = drain_timeout
self.throttle = throttle
self._subscriptions: List[str] = []
self.queue: asyncio.Queue[Dict[str, Any]] = asyncio.Queue(maxsize=32)
self._relay_task = asyncio.create_task(self.relay())
# Internal event to signify a closed websocket
self._closed = False
# Wrap the WebSocket in the Serializing class
self._wrapped_ws = self._serializer_cls(self._websocket)
def __repr__(self):
return f"WebSocketChannel({self.channel_id}, {self.remote_addr})"
@property
def raw(self):
return self._websocket.raw
@property
def remote_addr(self):
return self._websocket.remote_addr
async def _send(self, data):
"""
Send data on the wrapped websocket
"""
await self._wrapped_ws.send(data)
async def send(self, data) -> bool:
"""
Add the data to the queue to be sent.
:returns: True if data added to queue, False otherwise
"""
try:
await asyncio.wait_for(
self.queue.put(data),
timeout=self.drain_timeout
)
return True
except asyncio.TimeoutError:
return False
async def recv(self):
"""
Receive data on the wrapped websocket
"""
return await self._wrapped_ws.recv()
async def ping(self):
"""
Ping the websocket
"""
return await self._websocket.ping()
async def close(self):
"""
Close the WebSocketChannel
"""
self._closed = True
self._relay_task.cancel()
def is_closed(self) -> bool:
"""
Closed flag
"""
return self._closed
def set_subscriptions(self, subscriptions: List[str] = []) -> None:
"""
Set which subscriptions this channel is subscribed to
:param subscriptions: List of subscriptions, List[str]
"""
self._subscriptions = subscriptions
def subscribed_to(self, message_type: str) -> bool:
"""
Check if this channel is subscribed to the message_type
:param message_type: The message type to check
"""
return message_type in self._subscriptions
async def relay(self):
"""
Relay messages from the channel's queue and send them out. This is started
as a task.
"""
while True:
message = await self.queue.get()
try:
await self._send(message)
self.queue.task_done()
# Limit messages per sec.
# Could cause problems with queue size if too low, and
# problems with network traffik if too high.
# 0.01 = 100/s
await asyncio.sleep(self.throttle)
except RuntimeError:
# The connection was closed, just exit the task
return
class ChannelManager:
def __init__(self):
self.channels = dict()
self._lock = RLock() # Re-entrant Lock
async def on_connect(self, websocket: WebSocketType):
"""
Wrap websocket connection into Channel and add to list
:param websocket: The WebSocket object to attach to the Channel
"""
if isinstance(websocket, FastAPIWebSocket):
try:
await websocket.accept()
except RuntimeError:
# The connection was closed before we could accept it
return
ws_channel = WebSocketChannel(websocket)
with self._lock:
self.channels[websocket] = ws_channel
return ws_channel
async def on_disconnect(self, websocket: WebSocketType):
"""
Call close on the channel if it's not, and remove from channel list
:param websocket: The WebSocket objet attached to the Channel
"""
with self._lock:
channel = self.channels.get(websocket)
if channel:
logger.info(f"Disconnecting channel {channel}")
if not channel.is_closed():
await channel.close()
del self.channels[websocket]
async def disconnect_all(self):
"""
Disconnect all Channels
"""
with self._lock:
for websocket in self.channels.copy().keys():
await self.on_disconnect(websocket)
self.channels = dict()
async def broadcast(self, data):
"""
Broadcast data on all Channels
:param data: The data to send
"""
with self._lock:
message_type = data.get('type')
for channel in self.channels.copy().values():
if channel.subscribed_to(message_type):
await self.send_direct(channel, data)
async def send_direct(self, channel, data):
"""
Send data directly through direct_channel only
:param direct_channel: The WebSocketChannel object to send data through
:param data: The data to send
"""
if not await channel.send(data):
await self.on_disconnect(channel.raw)
def has_channels(self):
"""
Flag for more than 0 channels
"""
return len(self.channels) > 0