![](/img/trans.png)
[英]Django channels websocket connecting and disconnecting (Nginx + Daphne + Django + Channels)
[英]Websocket timeout in Django Channels / Daphne
簡短的問題版本:在我的Daphne配置,我的消費者代碼或我的客戶端代碼中,我做錯了什么?
channels==1.1.8
daphne==1.3.0
Django==1.11.7
詳情如下:
我試圖使用Django Channels和Daphne接口服務器保持持久的Websocket連接打開。 我正在使用大多數默認參數啟動Daphne: daphne -b 0.0.0.0 -p 8000 my_app.asgi:channel_layer
。
我看到連接在瀏覽器中的一些空閑時間后關閉,很快超過20秒。 與斷開連接發送的CloseEvent
的code
值為1006
(異常關閉),沒有設置reason
,並且wasClean
設置為false。 這應該是服務器關閉連接而不發送顯式關閉幀。
Daphne CLI具有--ping-interval
和--ping-timeout
標志,默認值分別為20秒和30秒。 對於前者,這被記錄為“在發送保持活動ping之前WebSocket必須空閑的秒數”,對於后者,記錄為“如果對keepalive ping沒有響應則關閉WebSocket之前的秒數”。 我讀到這個,因為Daphne將等待WebSocket空閑20秒發送ping,如果30秒后沒有收到響應,將關閉Websocket。 我所看到的是連接在空閑20秒后關閉。 (默認情況下三次嘗試,在20081ms,20026ms和20032ms之后關閉)
如果我將服務器更改為使用daphne -b 0.0.0.0 -p 8000 --ping-interval 10 --ping-timeout 60 my_app.asgi:channel_layer
,則連接仍然關閉,大約20秒空閑時間。 (經過三次嘗試更新ping后,在19892ms之后關閉,20011ms,19956ms)
代碼如下:
consumer.py
:
import logging
from channels import Group
from channels.generic.websockets import JsonWebsocketConsumer
from my_app import utilities
logger = logging.getLogger(__name__)
class DemoConsumer(JsonWebsocketConsumer):
"""
Consumer echos the incoming message to all connected Websockets,
and attaches the username to the outgoing message.
"""
channel_session = True
http_user_and_session = True
@classmethod
def decode_json(cls, text):
return utilities.JSONDecoder.loads(text)
@classmethod
def encode_json(cls, content):
return utilities.JSONEncoder.dumps(content)
def connection_groups(self, **kwargs):
return ['demo']
def connect(self, message, **kwargs):
super(DemoConsumer, self).connect(message, **kwargs)
logger.info('Connected to DemoConsumer')
def disconnect(self, message, **kwargs):
super(DemoConsumer, self).disconnect(message, **kwargs)
logger.info('Disconnected from DemoConsumer')
def receive(self, content, **kwargs):
super(DemoConsumer, self).receive(content, **kwargs)
content['user'] = self.message.user.username
# echo back content to all groups
for group in self.connection_groups():
self.group_send(group, content)
routing.py
:
from channels.routing import route
from . import consumers
channel_routing = [
consumers.DemoConsumer.as_route(path=r'^/demo/'),
]
demo.js
:
// Tracks the cursor and sends position via a Websocket
// Listens for updated cursor positions and moves an icon to that location
$(function () {
var socket = new WebSocket('ws://' + window.location.host + '/demo/');
var icon;
var moveTimer = null;
var position = {x: null, y: null};
var openTime = null;
var lastTime = null;
function sendPosition() {
if (socket.readyState === socket.OPEN) {
console.log('Sending ' + position.x + ', ' + position.y);
socket.send(JSON.stringify(position));
lastTime = Date.now();
} else {
console.log('Socket is closed');
}
// sending at-most 20Hz
setTimeout(function () { moveTimer = null; }, 50);
};
socket.onopen = function (e) {
var box = $('#websocket_box');
icon = $('<div class="pointer_icon"></div>').insertAfter(box);
box.on('mousemove', function (me) {
// some browsers will generate these events much closer together
// rather than overwhelm the server, batch them up and send at a reasonable rate
if (moveTimer === null) {
moveTimer = setTimeout(sendPosition, 0);
}
position.x = me.offsetX;
position.y = me.offsetY;
});
openTime = lastTime = Date.now();
};
socket.onclose = function (e) {
console.log("!!! CLOSING !!! " + e.code + " " + e.reason + " --" + e.wasClean);
console.log('Time since open: ' + (Date.now() - openTime) + 'ms');
console.log('Time since last: ' + (Date.now() - lastTime) + 'ms');
icon.remove();
};
socket.onmessage = function (e) {
var msg, box_offset;
console.log(e);
msg = JSON.parse(e.data);
box_offset = $('#websocket_box').offset();
if (msg && Number.isFinite(msg.x) && Number.isFinite(msg.y)) {
console.log((msg.x + box_offset.left) + ', ' + (msg.y + box_offset.top));
icon.offset({
left: msg.x + box_offset.left,
top: msg.y + box_offset.top
}).text(msg.user || '');
}
};
});
asgi.py
:
import os
from channels.asgi import get_channel_layer
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "my_project.settings")
channel_layer = get_channel_layer()
settings.py
:
CHANNEL_LAYERS = {
'default': {
'BACKEND': 'asgi_redis.RedisChannelLayer',
'ROUTING': 'main.routing.channel_routing',
'CONFIG': {
'hosts': [
'redis://redis:6379/2',
],
'symmetric_encryption_keys': [
SECRET_KEY,
],
}
}
}
根本問題是接口服務器前面的nginx代理。 代理設置為proxy_read_timeout 20s;
。 如果從服務器生成了keepalive ping,則這些ping不會計入上游讀取超時。 將此超時增加到更大的值允許Websocket更長時間保持打開狀態。 我保持proxy_connect_timeout
和proxy_send_timeout
在20s
。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.