http是短连接，无状态的。

websocket是长连接，有状态的。

flask中使用websocket

from flask import Flask, request
import asyncio
import json
import time
import websockets
from threading import Thread
from urllib.parse import urlparse, parse_qs
from functools import partial

app = Flask(__name__)

# 存储所有的WS客户端对象
# websocketClient_list = []
userId_websocketClient = dict()


async def send_message(message):
    # while True:
    #     if websocketClient_list:
    #         message = json.dumps({"time": str(time.time())}, ensure_ascii=False)
    #         await asyncio.wait([client.send(message) for client in websocketClient_list])
    #     await asyncio.sleep(1)
    # message = json.dumps({"time": str(time.time())}, ensure_ascii=False)
    # await asyncio.wait([client.send(message) for client in websocketClient_list])
    client = userId_websocketClient.get('1')
    if client:
        await asyncio.wait([client.send(message)])


async def websocket_handler(websocket, path):
    parsed_url = urlparse(path)
    query_params = parse_qs(parsed_url.query)
    # 访问参数
    user_id = query_params.get('userId')
    user_id = user_id[0] if user_id[0] else None
    if user_id:
        userId_websocketClient[user_id] = websocket

    # websocketClient_list.append(websocket)
    try:
        async for message in websocket:
            print(f"客户端发来消息：{message}")
    except websockets.ConnectionClosed:
        print("websocket closed")
    finally:
        # websocketClient_list.remove(websocket)
        del userId_websocketClient[user_id]


@app.route("/framework/pushMessage/framework_czc")
def index():
    return "WebSocket server is running. Connect to ws://<server-address>:8001/websocket"


@app.route("/send/message")
def sendMessage():
    message = "xxxxxx"

    # 创建带有参数的协程对象
    coro = partial(send_message, message)
    asyncio.set_event_loop(asyncio.new_event_loop())
    loop = asyncio.get_event_loop()
    loop.run_until_complete(coro())
    loop.close()

    return "success"


def run_websocket_server():
    asyncio.set_event_loop(asyncio.new_event_loop())
    start_server = websockets.serve(websocket_handler, "0.0.0.0", 8001)
    asyncio.get_event_loop().run_until_complete(start_server)
    # asyncio.get_event_loop().run_until_complete(send_message())
    asyncio.get_event_loop().run_forever()


if __name__ == '__main__':
    websocket_thread = Thread(target=run_websocket_server)
    websocket_thread.start()
    app.run(host="0.0.0.0", port=8000)