我使用Gunicorn运行一个非常基本的Flask应用程序(通过pipenv),该应用程序由Vue网站引用(基本上它并不比这个MCVE复杂得多)。
Pipfile :
[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"
[dev-packages]
[packages]
flask = "*"
flask-cors = "*"
flask-pymongo = "*"
gunicorn = "*"
[requires]
python_version = "3.5"
wsgi.py :
from helloworld import application
if __name__ == "__main__":
application.run()
helloworld.py :
from flask import Flask
from flask_cors import CORS
from flask_pymongo import PyMongo
import json
application = Flask(__name__)
CORS(application)
application.config['MONGO_DBNAME'] = 'helloworld'
mongo = PyMongo(application, config_prefix='MONGO')
@application.route("/greet")
def hello():
someone = mongo.db.people.find_one({},{"_id":0})
return json.dumps(someone)
if __name__ == "__main__":
application.run(host='0.0.0.0', port=5432)
的index.html :
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<title>Hello World!</title>
</head>
<body>
<h1>Hello</h1>
<p class="paragraph" id="app">{{ greeted }}!</p>
</body>
</html>
<script>
new Vue({
el: '#app',
data: {
greeted: ''
},
created () {
fetch('http://0.0.0.0:5432/greet')
.then(response => response.json())
.then(json => {this.greeted = json.name})
}
})
</script>
(对mongo.db.people.find_one({},{"_id":0})
的调用会返回{"name":"World"}
)
当我使用Flask开发服务器运行时:
pipenv run python helloworld.py
网站在硬刷新时快速获得价值。但是,如果我通过Gunicorn运行它:
pipenv run gunicorn -w 3 -b 0.0.0.0:5432 wsgi
返回数据可能需要几个秒(有时是几分钟)。
导致此行为的原因是什么?
作为参考,this问题与标题类似,但有不同的问题。
编辑:如果我让服务器运行足够长时间,我会收到以下消息:
[CRITICAL] WORKER TIMEOUT (pid:XXXXX)
编辑2 :将工作人员类型更改为gevent似乎可以解决问题:
pipenv run gunicorn --worker-class gevent -w 3 -b 0.0.0.0:5432 wsgi
我不确定为什么(我没有做任何会导致阻塞数十秒的事情)。此外,更改为gevent会导致此警告:
/home/user/.local/share/virtualenvs/FlaskApp-XXXXX/lib/python3.5/site-packages/gunicorn/workers/ggevent.py:65:MonkeyPatchWarning:ssl之后的猴子修补ssl已经导入可能会导致错误,包括Python 3.6上的RecursionError。请早点修补猴子。见https://github.com/gevent/gevent/issues/1016 monkey.patch_all(子= TRUE)