Django3 channels websocket实时读取日志返回前端

routing.py

from django.urls import re_path
from . import consumers

websocket_urlpatterns = [
    re_path(r'ws/', consumers.ChatConsumer.as_asgi()),
]

consummers.py

# -*- coding: utf-8 -*-
# chat/consumers.py
import json
from channels.generic.websocket import AsyncWebsocketConsumer
import asyncio
import os


class ChatConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        await self.accept()
        # g = '/usr/local/nginx/logs/access.log'
        # f = open(g)
        # while True:
        #     await asyncio.sleep(1)
        #     message = f.read()
        #     print(message)
        #     await self.send(text_data=json.dumps({
        #         'message': message
        #     }))

    async def disconnect(self, code):
        await self.close()

    async def receive(self, text_data=None, bytes_data=None):
        print(text_data)
        # clean log
        os.system("echo clean log success > /var/log/ywcontrol.log")
        os.system("echo `date` >> /var/log/ywcontrol.log")
        os.system("echo Let is get your act together, honey .>> /var/log/ywcontrol.log")
        # if text_data == "exp":
        g = '/var/log/ywcontrol.log'
        f = open(g)
        while True:
            await asyncio.sleep(2)
            message = f.read()
            if message:
                try:
                    await self.send(text_data=json.dumps({
                        'message': message
                    }))
                except Exception as e:
                    print(e)

前端html JS部分

const chatSocket = new WebSocket(
            'ws://'
            + window.location.host
            + '/ws/'
        );

        chatSocket.onopen = function () {
            chatSocket.send("Websocket send data!")
              };
        chatSocket.onmessage = function(evt) {
            console.log('here');
            const data = JSON.parse(evt.data);
            {#document.getElementById('chat-log').innerText=(data['message']);#}
            document.querySelector('#chat-log').value += (data.message + '
');
        };
        chatSocket.onclose = function(e) {
            console.error('Chat socket closed unexpectedly');
        };
        window.onbeforeunload = function () {
            chatSocket.close();
        };
        function closeWebSocket() {
            chatSocket.close();
}