Python Gevent我看不到猴子打补丁默认文件打开/读取/写入/关闭，如何在gevent异步中制作文件io

问题描述

在gevent猴子补丁中，我没有看到有关默认文件对象操作的任何信息.如何在基于gevent的程序中使用异步文件读/写?

In gevent monkey patch, I didn't see anything about default file object's operate.How can I use async file read/write in gevent based programs?

推荐答案

您可以使用gevent的fileobject.FileObjectThreadPool类，该类在1.0b3中可用:

You could use gevent's fileobject.FileObjectThreadPool class available in 1.0b3:

pip install http://gevent.googlecode.com/files/gevent-1.0b3.tar.gz#egg=gevent

那么您的示例将变为:

#!/usr/bin/env python
import gevent
from gevent.fileobject import FileObjectThreadPool
import datetime


def hi():
    while True:
        print datetime.datetime.now(), "Hello"
        gevent.sleep( 1 )

def w():
    print "writing..."
    s = "*"*(1024*1024*1024)
    print 'about to open'
    f_raw = open( "./a.txt", "wb" )
    f = FileObjectThreadPool(f_raw, 'wb')
    f.write(s)
    f.close()
    print 'write done'

t1 = gevent.spawn(hi)
t2 = gevent.spawn(w)
ts = [t1,t2]
gevent.joinall( ts )

我看到带有该代码的以下输出:

I see the following output with that code:

writing...
about to open
2012-08-13 13:00:27.876202 Hello
2012-08-13 13:00:28.881119 Hello
2012-08-13 13:00:29.959642 Hello
...
2012-08-13 13:00:58.010001 Hello
2012-08-13 13:00:59.010146 Hello    
2012-08-13 13:01:00.010248 Hello
write done
2012-08-13 13:01:01.469547 Hello
...

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