LWP Upload a file with a progress indicator

[zentara]

Hi, Someone asked elsewhere, about how to get a progress indicator on a file upload. I am not talking about using a browser, but with something like LWP or libCurl.

There seems to be a way with libCurl,according to the docs, but I have yet to get anything to work. There are so many interrealted libcurl options, I've havn't been able to get it to put out the right headers for a multipart form file upload, and I'm not even close tothe file part.

With LWP, it's quite easy to do the upload with HTTP::Request::Common, but it does not have a way to do "chunked uploads" where we can extract progress from. By looking at the docs, there is some mention of $DYNAMIC_FILE_UPLOAD, but I've yet to see a snippet which works.

A groups.google search on this topic is filled with people failing with libCurl scripts(written in PhP), and nothing for LWP using $DYNAMIC_FILE_UPLOAD.

So does anyone have a minimal script, showing how to upload a file with either libCurl, or LWP, and have a progress callback of some sort? I am still working on it, but I'm to the point of guessing at options and headers, :-) so I figure it's time to ask.

[beauregard]

I've done a bit of work with this.. The basic idea is:

$HTTP::Request::Common::DYNAMIC_FILE_UPLOAD = 1;
my $req = make_http_request();
my $gen = $req->content();
die unless ref($gen) eq "CODE";

$req->content(
    sub {
        my $chunk = &$gen();
        print "." x (length($chunk)/1024) if defined $chunk;
        return $chunk;
    }
);
my $res = $ua->request($req);

This snippet will spit out a period for, more or less, each kilobyte uploaded. That's the theory. I've found that this isn't entirely reliable for every LWP implementation I've tried (not many, either).

c.

[zentara]

Thanks, that's just the kind of thing I needed to get me going. The Flickr-Upload is pretty new, I'll have to check it out.

[Anonymous Monk]

How can this acutally be used to resume a upload?

[Anonymous Monk]

you need ftp server