http file post

[Dave]

Greetings.

Ive been trying to figure out how I can write to a file from an HTTP
post while it is being uploaded. So far ive realized that my script
isn't getting the data until the browser is done uploading. What I want
to accomplish is a way to track the progress of a file upload. I'm
guessing that if I can get it to write to a file as it is uploaded I can
load another browser to check the progress of the transfer (by refreshing).

Here is the general idea I have tried:

if item.file:
filen = item.filename
filen1 = filen.split('\\')
filen2 = filen1[len(filen1)-1]
outfile = open(path + filen2 + '.tmp','wb')
buff = item.file.read(40000)
while buff != "":
outfile.write(buff)
buff = item.file.read(40000)
if not buff:
break

Works, but I recieve the data all at once rather then while..

Perhaps it is my ignorance about how http works and that there is no
other way?

Thanks in advance.
-Dave

 

[Tim Roberts]

Ive been trying to figure out how I can write to a file from an HTTP
post while it is being uploaded. So far ive realized that my script
isn't getting the data until the browser is done uploading. What I want
to accomplish is a way to track the progress of a file upload.

This IS possible, but you'll have to do some work.

I assume this is a CGI script, and that you're using cgi.FieldStorage() to
fetch the POST contents. The key problem for you is that
cgi.FieldStorage() (and, more specifically, cgi.FieldStorage.read_binary)
does not return until the entire transmission is complete.

Now that you know that, your path should be clear: all you need to do is
make your own custom version of FieldStorage that updates a status variable
somewhere. Piece of cake!

 

[Dave Yerrington]

Kind of rough but I figured it out. If anyone finds this usefull:

HTTP File upload handler with progress indicator
http://projects.battlestyle.org/

-dave

----- Original Message -----
From: "Tim Roberts" <[email protected]>
Newsgroups: comp.lang.python
To: <[email protected]>
Sent: Monday, May 31, 2004 5:37 PM
Subject: Re: http file post