如何使用websocket [Python服務器，js客戶端]每3秒發送一次JSON

Question

我的Python服務器通過websocket發送JSON，代碼如下：

import asyncio
import datetime
import random
import websockets
import json
import threading

stopSignal = 0

def stopTestINT():
    print("test Stop \n")
    stopSignal = 1

async def wsjson(websocket, path):

    while True:

        data = datetime.datetime.now()

        randomINT = random.randint(1, 101)

        sensors_data = {
                'property': {
                    'INT': randomINT,
                    'stop' : stopSignal
                    } 
            }

        timer = threading.Timer(15.0, stopTestINT)  

        if randomINT < 80:
            timer.start()
        else:
            timer.cancel()

        print_json = json.dumps(sensors_data)

        await websocket.send(print_json)
        await asyncio.sleep(3)


start_server = websockets.serve(wsjson, '127.0.0.1', 5678)

asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()

使用這個示例代碼我每3秒發送一次這個json，但在客戶端我收到（每3秒）三個randomINT。 為什么？

1.當我關閉連接時（在JS中，使用ws.close（））連接沒有關閉，事實上我收到了這個錯誤：

Error in connection handler
Traceback (most recent call last):
  File "C:\*\*\AppData\Local\Programs\Python\Python37-32\lib\site-packages\websockets\server.py", line 169, in handler
    yield from self.ws_handler(self, path)
  File "C:\Users\*\**\websockets py\websjson.py", line 160, in wsjson
    await websocket.send(print_json)
  File "C:\Users\**\Python\Python37-32\lib\site-packages\websockets\protocol.py", line 462, in send
    yield from self.ensure_open()
  File "C:\Users\*\Python\Python37-32\lib\site-packages\websockets\protocol.py", line 646, in ensure_open
    ) from self.transfer_data_exc
websockets.exceptions.ConnectionClosed: WebSocket connection is closed: code = 1005 (no status code [internal]), no reason

2.並且計時器不起作用，實際上在提示中我看到每3秒“測試停止”。

理論上，我想只要一個> 80的隨機到達，然后計時器停止並在找到一個<80的數字時再次啟動。

Answer 1

考慮在while True語句中使用time.sleep(X)而不是timer。