如何使用 Python (Django) 制作 SSE? [英] How can I make SSE with Python (Django)?
问题描述
我有两个不同的页面，一个 (A) 显示从模型对象中获取的数据，另一个 (B) 更改其字段.我希望当 post 数据从 B 发送到服务器时，服务器会更改 A 中的值.最好的方法是什么?
I have two different pages, one (A) that displays data taken from a model object, and one (B) that changes its fields. I would like that when the post data is sent from B to the server, the server changes the values in A. What is the best way to do it?
这个例子对我有用，但它是用 PHP 编写的……有没有办法用 Python 复制它?https://www.w3schools.com/html/html5_serversentevents.asp
This example could work for me but it's in PHP... there is a way to replicate it whit Python? https://www.w3schools.com/html/html5_serversentevents.asp
推荐答案
这是 Django 中 w3schools 的工作示例:
This is working example from w3schools in Django:
模板
<!DOCTYPE html>
<html>
<body>
<h1>Getting server updates</h1>
<div id="result"></div>
<script>
if(typeof(EventSource) !== "undefined") {
var source = new EventSource("stream/");
source.onmessage = function(event) {
document.getElementById("result").innerHTML += event.data + "<br>";
};
} else {
document.getElementById("result").innerHTML = "Sorry, your browser does not support server-sent events...";
}
</script>
</body>
</html>
观看次数
import datetime
import time
from django.http import StreamingHttpResponse
def stream(request):
def event_stream():
while True:
time.sleep(3)
yield 'data: The server time is: %s
' % datetime.datetime.now()
return StreamingHttpResponse(event_stream(), content_type='text/event-stream')
网址
urlpatterns = [
path('stream/', views.stream, name='stream')
]
更新:
如果您想管理您的通知，您可以创建如下模型:
If you want to manage your notifications you can create the model like:
from django.db import models
class Notification(models.Model):
text = models.CharField(max_length=200)
user = models.ForeignKey(User, on_delete=models.CASCADE)
sent = models.BooleanField(default=False)
然后创建寻找第一个未发送通知的视图并发送它:
Then create the view that is looking for the first unsent notification and sends it:
@login_required
def stream(request):
def event_stream():
while True:
time.sleep(3)
notification = Notification.objects.filter(
sent=False, user=request.user
).first()
text = ''
if notification:
text = notification.text
notification.sent = True
notification.save()
yield 'data: %s
' % text
return StreamingHttpResponse(event_stream(), content_type='text/event-stream')
以及在 Notification 模型中创建条目的 send_notification 函数(只需从代码中的任何位置调用此函数):
And the send_notification function that creates an entry in the Notification model (just call this function from anywhere in your code):
def send_notification(user, text):
Notification.objects.create(
user=user, text=text
)
就是这样，就这么简单.
That's it, simple as that.
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