我正在尝试将项目从开发转移到生产。 (在开发阶段,我只使用Flask
,现在我使用Gunicorn
在Nginx
后面运行它。)
我在服务特定网页songs.html
时遇到问题。
页面正确加载虚拟变量(jukebox = [whatever]
),但在现实生活中我使用的是生成器,如下所示:
playlist= query_playlist(p)
jukebox = next(playlist)
return render_template('songs.html',
jukebox=jukebox)
并且此函数需要一段时间(比如2s)才能返回结果...但是没有提供结果,并且只有在返回结果后进程才会挂起。
我像这样运行应用程序:
(appenv)$gunicorn -c gconfig.py app:app
wsgi.ppy
from app import app as application
if __name__ == "__main__":
application.run(host='0.0.0.0')
gconfig.py:
workers = 16
worker_class = 'sync'
worker_connections = 1000
timeout = 120 # changed this from 30 up
keepalive = 2
nginx.conf (brew
安装)
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
proxy_pass http://127.0.0.1:8000/;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
如果我使用python app.py
运行应用,请返回开发阶段:
if __name__ == '__main__':
app.run(use_reloader=True, threaded=True, debug=True)
至少我得到以下追溯:
Error on request:
Traceback (most recent call last):
File "/Users/me/Documents/Code/Apps/app/appenv/lib/python2.7/site-packages/werkzeug/serving.py", line 270, in run_wsgi
execute(self.server.app)
File "/Users/me/Documents/Code/Apps/app/appenv/lib/python2.7/site-packages/werkzeug/serving.py", line 261, in execute
write(data)
File "/Users/me/Documents/Code/Apps/app/appenv/lib/python2.7/site-packages/werkzeug/serving.py", line 236, in write
self.send_header('Server', self.version_string())
File "/Users/me/anaconda2/lib/python2.7/BaseHTTPServer.py", line 412, in send_header
self.wfile.write("%s: %s\r\n" % (keyword, value))
IOError: [Errno 32] Broken pipe
所以有人知道如何解决这个问题吗?
修改
即使结果需要处理2秒,我也会获得相同的追溯。
答案 0 :(得分:0)
根据Flask docs(以及#arielnmz sugestion),您可以直播内容:
from flask import Response, stream_with_context
@app.route('/playlist')
def generate_playlist():
def generate():
jukebox = query_playlist(p)
for i in jukebox:
yield i[0]['artist']
return Response(stream_with_context(generate()))
每个yield表达式都直接发送到浏览器。
诀窍是有一个内部函数,它使用生成器生成数据,然后调用该函数并将其传递给响应对象。
这很有效。