38 lines
973 B
Python
38 lines
973 B
Python
import asyncio
|
|
import json
|
|
|
|
from fastapi import WebSocket, WebSocketDisconnect
|
|
|
|
_connections: list[WebSocket] = []
|
|
|
|
|
|
async def connect(ws: WebSocket):
|
|
await ws.accept()
|
|
_connections.append(ws)
|
|
try:
|
|
while True:
|
|
await ws.receive_text() # keep alive
|
|
except WebSocketDisconnect:
|
|
_connections.remove(ws)
|
|
|
|
|
|
def broadcast(msg: dict):
|
|
"""Send a message to all connected WebSocket clients.
|
|
|
|
Called from sync code (export callbacks), so we schedule the coroutine
|
|
on each connection's event loop.
|
|
"""
|
|
data = json.dumps(msg)
|
|
stale = []
|
|
for ws in _connections:
|
|
try:
|
|
loop = asyncio.get_event_loop()
|
|
if loop.is_running():
|
|
asyncio.run_coroutine_threadsafe(ws.send_text(data), loop)
|
|
else:
|
|
loop.run_until_complete(ws.send_text(data))
|
|
except Exception:
|
|
stale.append(ws)
|
|
for ws in stale:
|
|
_connections.remove(ws)
|