django通道无法实时输出日志

Question

我的代码：

def ws_receive(message):
    text = message.content['text']
    request = json.loads(text)
    cmd = request['cmd']      

    results = run(cmd)
    print(cmd)
    for result in results:
         Group(GROUP_NAME).send({'text':result.decode('utf-8')})
         print(result)

cmd类似于ping -c 4 www.google.com；

最终结果是：

[2017/09/24 07:24:44] WebSocket HANDSHAKING / [127.0.0.1:59285]
[2017/09/24 07:24:44] WebSocket CONNECT / [127.0.0.1:59285]
[2017/09/24 07:24:44] HTTP GET /api/hosts/?status=used 200 [0.07, 127.0.0.1:59247]
ping -c 4 www.google.com
2017-09-24 07:24:58.512885 b'PING www.google.com (74.125.23.103): 56 data bytes\n'
2017-09-24 07:24:58.513127 b'64 bytes from 74.125.23.103: icmp_seq=0 ttl=45 time=138.542 ms\n'
2017-09-24 07:24:59.517881 b'64 bytes from 74.125.23.103: icmp_seq=1 ttl=45 time=142.954 ms\n'
2017-09-24 07:25:00.522698 b'64 bytes from 74.125.23.103: icmp_seq=2 ttl=45 time=144.568 ms\n'
2017-09-24 07:25:01.562285 b'64 bytes from 74.125.23.103: icmp_seq=3 ttl=45 time=180.163 ms\n'
2017-09-24 07:25:01.562400 b'\n'
2017-09-24 07:25:01.562459 b'--- www.google.com ping statistics ---\n'
2017-09-24 07:25:01.562517 b'4 packets transmitted, 4 packets received, 0.0% packet loss\n'
2017-09-24 07:25:01.562586 b'round-trip min/avg/max/stddev = 138.542/151.557/180.163/16.662 ms\n'

但是，浏览器的websocket调试信息是：

​

因此，我确信通道在发送消息之前执行命令，但我希望实时发送消息。

Answer 1

试着立即发送：

Group(GROUP_NAME).send({'text':result.decode('utf-8')}, immediately=True)

这背后的原因是你在websocket消费者函数中。当您在其中时，Group.send调用不会执行，而是只在您离开函数后批量收集和执行。使用immediately=True将覆盖此行为。