Rails - May 2006 - send_file and locking files after download?

Hello,

I''m working on a download service which grants users a
one-time-download
access to files. The idea is to write an entry to a database table after 
a successful download that "locks" the download link for the user.

 After doing some quick tests with send_file I noticed that send_file 
does not block until the user has downloaded the full file, but proceeds 
with the rest of the controller code. For example:

  send_file fullpath, :stream => false, :disposition =>
''attachment'',
:filename => filename
  logger.info "*********** LOCK DOWNLOAD!! **************"

After send_file starts the file transfer, I can immediately see the 
"LOCK DOWNLOAD" entry in the log files. This would mean that if the
user
interrupts a big file download, it would still be locked.

What would be the solution? Do I have to somehow (..how?) write my own 
buffering file sending which blocks the control and breaks out of the 
controller if the user interrupts the transfer?

I would imagine :stream => true could be a step closer to my needs, but 
it doesn''t seem to work since all I get is "Rails application
failed to
start properly".

Any ideas?

-- 
Posted via http://www.ruby-forum.com/.

On Mon, 2006-05-15 at 01:08 +0200, Markku M?kel? wrote:
> Hello,
> 
> I''m working on a download service which grants users a
one-time-download
> access to files. The idea is to write an entry to a database table after 
> a successful download that "locks" the download link for the
user.
You should google "X-Sendfile".  It might help.


-- 
Zed A. Shaw
http://www.zedshaw.com/
http://mongrel.rubyforge.org/

Zed Shaw wrote:
>
> You should google "X-Sendfile".  It might help.
Hmm I don''t see how? My problem is that I want to execute code in the 
controller _after_ a successful download, but not if the download was 
interrupted.

mod_xsendfile just seems to replace Rails'' send_file, but
doesn''t allow
the control to return to the controller after download.

Nice looking little module anyway, might prove useful in some other 
project, so thanks anyway.

-markku

-- 
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To be more exact, what I''m looking for is

- first looping through a file send: block until user has downloaded the 
last byte of the file, or interrupts the transfer

- then check if the connection was aborted, like PHP''s if( 
connection_status() == 0 ) { lock_the_file(); }

The problem is that send_file seems to be non-blocking.

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