django中websocket的使用_@accept_websocket

websocket是一种持久化的协议，HTTP协议是一种无状态的协议，在特定场合我们需要使用长连接，做数据的实时更新，这种情况下我们就可以使用websocket做持久连接。http与websocket二者存在交集。

后端：

from dwebsocket.decorators import accept_websocket
import json
# 存储连接websocket的用户
clist = []
 
@accept_websocket
def websocketLink(request):
    # 获取连接
    if request.is_websocket:
        # 新增 用户  连接信息
        clist.append(request.websocket)
        # 监听接收客户端发送的消息 或者 客户端断开连接
        for message in request.websocket:
            break
 
 # 发送消息
def websocketMsg(client, msg):
    b1 = json.dumps(msg,ensure_ascii=False).encode('utf-8')
    client.send(b1)
 
# 服务端发送消息
def sendmsg():
    sql = "select * from customer"
    res = db1.find_all(sql)
    if len(clist)>0:
        for i in clist:
            i.send(json.dumps({'list': res},ensure_ascii=False).encode('utf-8'))
             # websocketMsg(i, {'list': res})
    return HttpResponse("ok")
 
from apscheduler.schedulers.blocking import BlockingScheduler
 
def getecharts(request):
    scheduler = BlockingScheduler()
    scheduler.add_job(sendmsg,'interval',seconds=1)
    scheduler.start()
    return HttpResponse('ok')

前端：

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    </van-row>
    <van-row>
      <van-col span="8"></van-col>
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