我想做一件非常简单的事情:启动一个worker到某个东西,然后将答案返回给用户。我尝试使用Flask和RQ的组合来做到这一点。
import os
from flask import Flask, session
from somewhere import do_something
from rq import Queue
from worker import conn
app = Flask(__name__)
app.debug = True
app.secret_key = '....'
q = Queue(connection=conn)
@app.route('/make/')
def make():
job = q.enqueue(do_something, 'argument')
session['job'] = job
return 'Done'
@app.route('/get/')
def get():
try:
session['job'].refresh()
out = str(session['job'].result)
except:
out = 'No result yet'
return out
这个非常简单的例子中的想法是,人们去做/然后工作就开始了。一段时间后,可以转到/get/,工人的结果将打印在那里。
然而,有一条线引起了问题:
session['job'] = job
这项工作似乎无法腌制,这显然是Flaks会议使用的。我得到错误:
...
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/lib/python2.7/site-packages/flask/app.py", line 804, in save_session
10:52:16 web.1 | return self.session_interface.save_session(self, session, response)
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/lib/python2.7/site-packages/flask/sessions.py", line 205, in save_session
10:52:16 web.1 | secure=secure, domain=domain)
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/lib/python2.7/site-packages/werkzeug/contrib/securecookie.py", line 329, in save_cookie
10:52:16 web.1 | data = self.serialize(session_expires or expires)
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/lib/python2.7/site-packages/werkzeug/contrib/securecookie.py", line 235, in serialize
10:52:16 web.1 | self.quote(value)
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/lib/python2.7/site-packages/werkzeug/contrib/securecookie.py", line 192, in quote
10:52:16 web.1 | value = cls.serialization_method.dumps(value)
10:52:16 web.1 | File "/Users/julius/twitter-sentiment/venv/bin/../lib/python2.7/copy_reg.py", line 70, in _reduce_ex
10:52:16 web.1 | raise TypeError, "can't pickle %s objects" % base.__name__
10:52:16 web.1 | TypeError: can't pickle function objects
我真的希望能有所帮助。我这样做的方式可能完全错误(通过会话传递作业),但我不知道如何访问作业的结果。。。
如有任何帮助,我们将不胜感激。
提前谢谢。
我以前没有使用过rq
,但我发现作业具有.key
属性。将该散列存储在会话中可能会更容易。然后,您可以使用Job
类的.fetch
方法,该方法本身将调用.refresh()
并将作业返回给您。此时读取.result()
将显示作业的当前状态。
也许是这样(未经测试):
from rq.job import Job
@app.route('/make/')
def make():
job = q.enqueue(do_something, 'argument')
session['job'] = job.key
return 'Done'
@app.route('/get/')
def get():
try:
job = Job()
job.fetch(session['job'])
out = str(job.result)
except:
out = 'No result yet'
return out
序列化参数的问题(您实际上试图序列化函数对象,这在pickle
中是不可能的)。
尝试
@app.route('/make/')
def make():
job = q.enqueue(func=do_something, args=('argument',))
session['job'] = job
return 'Done'