I'm trying to ingest data from an external WebSocket using Websocket Client A and send those messages to WebSocket Server B for clients connected to B to view. (Reason being, I'm trying to connect multiple external WebSockets and feed their messages to a single point, if this is a bad design can someone suggest an alternative)
Running server B uvicorn server:app --reload then visit http://127.0.0.1:8000/
WebSocket Server B
from typing import List
from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from fastapi.responses import HTMLResponse
app = FastAPI()
html = """
<!DOCTYPE html>
<html>
<head>
<title>Screener</title>
</head>
<body>
<h2>Your ID: <span id="ws-id"></span></h2>
<ul id='messages'>
</ul>
<script>
var client_id = Date.now()
document.querySelector("#ws-id").textContent = client_id;
var ws = new WebSocket(`ws://localhost:8000/ws/${client_id}`);
ws.onmessage = function(event) {
var messages = document.getElementById('messages')
var message = document.createElement('li')
var content = document.createTextNode(event.data)
message.appendChild(content)
messages.appendChild(message)
};
function sendMessage(event) {
var input = document.getElementById("messageText")
ws.send(input.value)
input.value = ''
event.preventDefault()
}
</script>
</body>
</html>
"""
class ConnectionManager:
def __init__(self):
self.active_connections: List[WebSocket] = []
async def connect(self, websocket: WebSocket):
await websocket.accept()
self.active_connections.append(websocket)
def disconnect(self, websocket: WebSocket):
self.active_connections.remove(websocket)
async def send_personal_message(self, message: str, websocket: WebSocket):
await websocket.send_text(message)
async def broadcast(self, message: str):
for connection in self.active_connections:
await connection.send_text(message)
manager = ConnectionManager()
@app.get("/")
async def get():
return HTMLResponse(html)
@app.websocket("/ws/{client_id}")
async def websocket_endpoint(websocket: WebSocket, client_id: int):
await manager.connect(websocket)
try:
while True:
data = await websocket.receive_text()
await manager.send_personal_message(f"You wrote: {data}", websocket)
await manager.broadcast(f"Client #{client_id} says: {data}")
except WebSocketDisconnect:
manager.disconnect(websocket)
await manager.broadcast(f"Client #{client_id} left the chat")
WebSocket ClientA
#!/usr/bin/env python
import websocket
import _thread
import time
import asyncio
import websockets
from concurrent.futures import ThreadPoolExecutor
_EXECUTOR_ = ThreadPoolExecutor(1)
async def main_loop():
async with websockets.connect("ws://localhost:8000/ws/1") as server_ws:
await server_ws.send("main_loop")
def send_message(message):
server_ws.send(message)
def ws_message(ws, message):
loop = asyncio.get_event_loop()
loop.run_in_executor(_EXECUTOR_, send_message, message)
print("WebSocket thread: %s" % message)
def ws_open(ws):
ws.send('{"event":"subscribe", "subscription":{"name":"trade"}, "pair":["XBT/USD","XRP/USD"]}')
def ws_thread(*args):
ws = websocket.WebSocketApp("wss://ws.kraken.com/", on_open = ws_open, on_message = ws_message)
ws.run_forever()
_thread.start_new_thread(ws_thread, ())
while True:
time.sleep(5)
print("Main thread: %d" % time.time())
asyncio.run(main_loop())
Copyright Notice：Content Author:「xchrisbradley」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/73450315/route-websocket-client-messages-to-websocket-server