Quart & websocket：如何只向选定的用户发送数据（私信）

Question

我知道如何传播，但我无法定位客户。这是我的脚本：

import json    
import trio
from quart import render_template, websocket, render_template_string
from quart_trio import QuartTrio    
from quart_auth import current_user,login_required    
from quart_auth import AuthUser, login_user, logout_user, AuthManager    
import random

connections = set()

app = QuartTrio(__name__)
AuthManager(app)    
app.secret_key = "secret key"    

@app.route("/")
async def index():        
    clean_guy = await current_user.is_authenticated        
    if not clean_guy:        
        fake_ID = random.randrange(0, 9999) #quick dirty to test
        login_user(AuthUser(fake_ID)) 
        return await render_template_string("{{ current_user.__dict__ }}")
    return await render_template_string("{{ current_user.__dict__ }}")      

@app.websocket("/ws")
async def chat():
    try:
        connections.add(websocket._get_current_object())
        async with trio.open_nursery() as nursery:
            nursery.start_soon(heartbeat)
            while True:
                message = await websocket.receive()
                await broadcast(message)
    finally:
        connections.remove(websocket._get_current_object())


async def broadcast(message):
    for connection in connections:
        await connection.send(json.dumps({"type": "message", "value": message}))    

async def heartbeat():
    while True:
        await trio.sleep(1)
        await websocket.send(json.dumps({"type": "heartbeat"}))    

if __name__ == '__main__':    
    app.run(host='0.0.0.0', port=5000)

这是我的模板：

<div>      
  <div>
    <ul>    
    </ul>
  </div>
  <form>
    <input type="text">
    <button type="submit">Send</button>
  </form>
</div>

<script type="text/javascript">
  document.addEventListener("DOMContentLoaded", function() {
    const ws = new WebSocket(`ws://${window.location.host}/ws`);
    ws.onmessage = function(event) {
      const data = JSON.parse(event.data);
      if (data.type === "message") {
        const ulDOM = document.querySelectorAll("ul")[0];
        const liDOM = document.createElement("li");
        liDOM.innerText = data.value;
        ulDOM.appendChild(liDOM);
      }
    }
    document.querySelectorAll("form")[0].onsubmit = function(event) {
      event.preventDefault();
      const inputDOM = document.querySelectorAll("input")[0];
      ws.send(inputDOM.value);
      inputDOM.value = "";
      return false;
    };
  });
</script>

还有一个问题：如果我在我的脚本中使用它：

return await render_template("{{ current_user.__dict__ }}")

即使我添加 {{ current_user.dict }}[=34= 我也无法使用我的神社模板显示它] 在我的模板中。

我还注意到：

使用 mozilla：我得到了一些稳定的东西，比如 {'_auth_id': 9635, 'action': }

with chrome：每次刷新都会改变，看起来像 {'_auth_id': 529, 'action': }

我需要显示作者、目的地和带有发送按钮的输入，如何修复模板？

是否也可以通过 curl 或 websocat 向使用 post 的目标用户发送消息？怎么做？

Answer 1

Quart-Auth 使用 cookie 来识别每个 request/websocket-request 上的用户，因此如果请求通过身份验证，您始终可以从 current_user 中获取用户的身份。然后根据您的需要，您需要将 websocket 连接映射到每个用户（以便您可以定位消息），因此连接映射应该是连接字典，例如

import random
from collections import defaultdict

from quart import request, websocket
from quart_trio import QuartTrio      
from quart_auth import (
    AuthUser, current_user, login_required, login_user, logout_user, AuthManager 
)   

connections = defaultdict(set)

app = QuartTrio(__name__)
AuthManager(app)    
app.secret_key = "secret key"    

@app.route("/login", methods=["POST"])
async def login():
    # Figure out who the user is,
    user_id = random.randrange(0, 9999)
    login_user(AuthUser(fake_ID)) 
    return {}

@app.websocket("/ws")
@login_required
async def chat():
    user_id = await current_user.auth_id
    try:
        connections[user_id].add(websocket._get_current_object())
        while True:
            data = await websocket.receive_json()
            await broadcast(data["message"])
    finally:
        connections[user_id].remove(websocket._get_current_object())

@app.route('/broadcast', methods=['POST'])
@login_required
async def send_broadcast():   
    data = await request.get_json()
    await broadcast(data["message"], data.get("target_id"))
    return {}

async def broadcast(message, target = None):
    if target is None:
        for user_connections in connections.values():
            for connection in user_connections:
                await connection.send_json({"type": "message", "value": message})
    else:
        for connection in connections[target]:
            await connection.send_json({"type": "message", "value": message})

 
if __name__ == '__main__':    
    app.run(host='0.0.0.0', port=5000)

然后您可以向 /broadcast 发送 JSON 这只是一条消息 {"message": "something"} 或带有 id 的消息以专门针对某个人 {"message": "something for user 2", "target_id": 2}。还要注意 @login_required 装饰器确保路由处理程序只为登录用户调用。

Quart & websocket：如何只向选定的用户发送数据（私信）

Quart & websocket: how to send data to selected users only (private message)

python

message

private

websocket

quart