Python：HTTP发布带有流媒体的大文件 [英] Python: HTTP Post a large file with streaming

问题描述

我正在将可能较大的文件上传到网络服务器。目前我正在这样做：

I'm uploading potentially large files to a web server. Currently I'm doing this:

import urllib2

f = open('somelargefile.zip','rb')
request = urllib2.Request(url,f.read())
request.add_header("Content-Type", "application/zip")
response = urllib2.urlopen(request)

但是，这会在发布之前将整个文件的内容读入内存。如何将文件流式传输到服务器？

However, this reads the entire file's contents into memory before posting it. How can I have it stream the file to the server?

推荐答案

通过systempuntoout链接到的邮件列表线程，我找到了解决方案的线索。

Reading through the mailing list thread linked to by systempuntoout, I found a clue towards the solution.

mmap 模块允许您打开类似字符串的文件。文件的一部分按需加载到内存中。

The mmap module allows you to open file that acts like a string. Parts of the file are loaded into memory on demand.

这是我现在使用的代码：

Here's the code I'm using now:

import urllib2
import mmap

# Open the file as a memory mapped string. Looks like a string, but 
# actually accesses the file behind the scenes. 
f = open('somelargefile.zip','rb')
mmapped_file_as_string = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)

# Do the request
request = urllib2.Request(url, mmapped_file_as_string)
request.add_header("Content-Type", "application/zip")
response = urllib2.urlopen(request)

#close everything
mmapped_file_as_string.close()
f.close()

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