问题描述
我想知道flask如何(如果有的话)执行长时间轮询,以便服务器可以通过连接将数据发送到客户端。例如,如果服务器通过流式API接收到Twitter提要,该提要将如何传递到客户端浏览器?
I was wondering how (if at all) flask performs long polling, so the server can send data over a connection to the client. For example if the server receives a twitter feed via the streaming api how will that be passed to the client browser?
我收集到您不能使用flask.flash进行此类操作
I gather that you cannot use flask.flash for such a situation.
谢谢
感谢示例。我看了看这些示例,当我尝试为我的代码实现它时,它仍然没有在客户端浏览器中提供实时输出。
Thanks for the examples. I looked at the examples and when I try to implement it for my code, it still does not provide a real-time output in the client browser.
我已经使用剑圣和redis将其围绕在烧瓶snippet()周围。这是我的python代码:
I have based it around the flask snippet() using juggernaut and redis. This is my python code:
import flask
from flask.views import MethodView
from tweetStreamsRT import StreamerRt
from juggernaut import Juggernaut
app = flask.Flask(__name__)
app.secret_key = "xxxxx"
PORT = 8080
class View(MethodView):
def get(self):
return flask.render_template('index.html')
def post(self):
results = StreamerRt().filter(track=[flask.request.form['event']])
jug = Juggernaut()
jug.publish('channel', results)
return self.get()
app.add_url_rule('/', view_func = View.as_view('index'), methods=['GET', 'POST'])
app.debug = True
if __name__ == "__main__":
print 'Listening on http://localhost:%s' % PORT
app.run()
我的html页面是从基本html页面继承的:
My html page is, which inherits from a base html page:
{% extends "base.html" %}
{% import "forms.html" as forms %}
{% block page_header %}
<div class="page-header">
<h1>Welcome</h1>
</div>
{% endblock %}
{% block content %}
<h2>Enter the Event you would like to follow</h2>
<form action="/" method="post">
<input type="text" name="event" />
<input type="submit" value="Submit Query" />
</form>
Results:
<pre>
<script type="text/javascript" charset="utf-8">
var jug = new Juggernaut;
jug.subscribe("channel", function(data){
alert("Got data: " + data);});
</script>
</pre>
{% endblock %}
我仍然很困惑为什么什么都没发送到客户端浏览器。
I'm still confused as to why nothing is sent to the client browser.
谢谢
推荐答案
+ 。
- 的烧瓶。
- an example app using Flask with
gevent
+socketio
. - a socket.io route in Flask
- gevent-socketio
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