php resume ftp upload with curl multi

Question

I can't seem to resume an FTP upload using curl. It always appends the full local file to the partially uploaded remote file, resulting in the remote file being larger then the local file.

I am wondering if I have missed an option or if curl_multi has anything to do with it?

$resume = true

$filesize is the current size of the remote file in bytes, fetched using a separate curl ftp request.

I have tried with CURLOPT_FTPAPPEND option on and off.

Any help would be great as I am banging my head against the wall trying to figure this out :)

...

$ch[$i] = curl_init();

$file = fopen($local_file, 'rb');

if ($resume)
{           
        curl_setopt($ch[$i], CURLOPT_RESUME_FROM, $filesize);

        // move file position forward to resume
        fseek($file, $filesize);
}

curl_setopt($ch[$i], CURLOPT_URL, $remote_file);
curl_setopt($ch[$i], CURLOPT_PROTOCOLS, CURLPROTO_SFTP);
curl_setopt($ch[$i], CURLOPT_USERPWD, "{$ftp['user']}:{$ftp['pass']}");
curl_setopt($ch[$i], CURLOPT_UPLOAD, true);
curl_setopt($ch[$i], CURLOPT_HEADER, false);
curl_setopt($ch[$i], CURLOPT_INFILE, $file);
curl_setopt($ch[$i], CURLOPT_INFILESIZE, filesize($local_file));

curl_multi_add_handle($mh, $ch[$i]);

...

UPDATED

Since hours of googling didn't help, I came up with a simple work around.

There are not many posts on using curl to resume an upload so I hope this helps someone else save time.

It is just one line using fseek(), but that is usually the case ;)

I found a work around but could someone tell me why it was not working? Thanks — arbme, Feb 02 '18 at 01:30

score 0 · Answer 1 · answered Feb 17 '18 at 21:56

UPDATED

Since hours of googling didn't help, I came up with a simple work around.

There are not many posts on using curl to resume an upload so I hope this helps someone else save time.

Use fseek() to move file position before calling curl_setopt($ch[$i], CURLOPT_INFILE, $file);

...

$ch[$i] = curl_init();

$file = fopen($local_file, 'rb');

if ($resume)
{           
        curl_setopt($ch[$i], CURLOPT_RESUME_FROM, $filesize);

        // move file position forward to resume
        fseek($file, $filesize);
}

curl_setopt($ch[$i], CURLOPT_URL, $remote_file);
curl_setopt($ch[$i], CURLOPT_PROTOCOLS, CURLPROTO_SFTP);
curl_setopt($ch[$i], CURLOPT_USERPWD, "{$ftp['user']}:{$ftp['pass']}");
curl_setopt($ch[$i], CURLOPT_UPLOAD, true);
curl_setopt($ch[$i], CURLOPT_HEADER, false);
curl_setopt($ch[$i], CURLOPT_INFILE, $file);
curl_setopt($ch[$i], CURLOPT_INFILESIZE, filesize($local_file));

curl_multi_add_handle($mh, $ch[$i]);

...

how to check $resume? How do we know that connection interrupted and upload should progress form the resume? — augustine jenin, Oct 13 '19 at 06:19

php resume ftp upload with curl multi

1 Answers1