django channels can not output logs in real time - django-channels

Question

my code:
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 is like ping -c 4 www.google.com;
the terminal results is:
[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'
but,The browser's websocket debugging information is:
so, I‘am sure the channels is execute the command until the end sent the message,but i want real-time send the message.

Answer 1

Try sending immediately:
Group(GROUP_NAME).send({'text':result.decode('utf-8')}, immediately=True)
The reason behind this is that you are inside the websocket consumer function. While you are inside it, the Group.send calls are not executed, but only collected and executed in batch once you leave the function. Using immediately=True overrides this behaviour.