问题描述
我正在尝试按照 本教程 在我的 Flask 项目中实现服务器推送.
我已经设置好了，没有任何错误，但是当我转到/stream 页面时，Firefox 将其识别为文件并尝试下载它.在 Safari 中，它只是打印出发送的数据.我尝试将代码调整为更简单的实现，其中一个线程每秒只产生一些数据，但它产生了相同的结果.
我的目标是每次 Python 脚本到达循环中的一个点时，它都会更新 Web 界面上的进度条.
对此的任何帮助都会很棒.谢谢.
app.py
from flask import Flask, render_template, request, Responseapp = Flask(__name__)def event_stream():event = "你好！"产生数据:%s
"% 事件@app.route('/stream')定义流():返回响应(event_stream(), mimetype="text/event-stream")如果 __name__ == "__main__":app.debug = Trueapp.run(线程=真)index.html
EDIT
我已将示例应用程序上传到我的 Github.在这里查看:https://github.com/djdmorrison/flask-progress-example
我已经解决了，但对于遇到同样问题的其他人来说:
index.html 页面从未真正加载，因为它从未在 app.py 中调用.这样做的方法是转到单独的路由，例如/page，然后返回 send_file('index/html').这将加载索引页面，创建链接到/stream 的 EventSource，然后将启动 app.py 中的流方法并产生正确的数据.
通过每 0.2 秒增加 x 并在网页上显示来创建进度条的示例:
app.py
@app.route('/page')def get_page():return send_file('templates/progress.html')@app.route('/进度')定义进度():定义生成():x = 0当 x <100:打印 xx = x + 10时间.睡眠(0.2)产生数据:"+ str(x) +
"返回响应(生成()，mimetype = '文本/事件流')progress.html
I'm trying to implement server push in my Flask project following this tutorial.
I've set it all up with no errors, however when I go to the /stream page, Firefox recognizes it as a file and tries to download it. In Safari it just prints out the data sent. I tried adapting the code to a simpler implementation, where a thread just yields some data each second, however it produced the same results.
My goal is for each time a python script reaches a point in a loop, it will update a progress bar on the web interface.
Any help with this would be great. Thanks.
Edit:
app.py
from flask import Flask, render_template, request, Response
app = Flask(__name__)
def event_stream():
event = "Hello!"
yield 'data: %s
' % event
@app.route('/stream')
def stream():
return Response(event_stream(), mimetype="text/event-stream")
if __name__ == "__main__":
app.debug = True
app.run(threaded=True)
index.html
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
var source = new EventSource('/stream');
source.onmessage = function (event) {
alert(event.data);
};
</script>
</head>
<body>
<p>Stream page</p>
</body>
</html>
EDIT
I've uploaded my sample application to my Github. Check it out here: https://github.com/djdmorrison/flask-progress-example
I've worked it out, but for anyone else who gets the same problem:
The index.html page never actually loads, as it's never called in app.py. The way to do it is by going to a separate route, /page for example, and then returning send_file('index/html'). This will load the index page, create the EventSource linked to /stream, which will then start the stream method in app.py and yield the correct data.
Example which creates a progress bar by increasing x every 0.2 seconds and displaying it on the webpage:
app.py
@app.route('/page')
def get_page():
return send_file('templates/progress.html')
@app.route('/progress')
def progress():
def generate():
x = 0
while x < 100:
print x
x = x + 10
time.sleep(0.2)
yield "data:" + str(x) + "
"
return Response(generate(), mimetype= 'text/event-stream')
progress.html
<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script>
var source = new EventSource("/progress");
source.onmessage = function(event) {
$('.progress-bar').css('width', event.data+'%').attr('aria-valuenow', event.data);
}
</script>
</head>
<body>
<div class="progress" style="width: 50%; margin: 50px;">
<div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" style="width: 0%"></div>
</div>
</body>
</html>
这篇关于识别为下载的文本/事件流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！