[mod_python] Dynamically Creating Large Downloads In The Dark

Graham Dumpleton grahamd at dscpl.com.au
Sun May 15 22:13:03 EDT 2005

Presuming that request cleanup handlers are still only executed
after the whole file is sent when using sendfile(), use the method
req.register_cleanup() to register a callback which is run and which
would delete the file.


ijwilson at laspilitas.com wrote ..
> Hello mod_python and friends,
>   I was hoping someone could help me with some basic questions because
> I am 
> kind of just running around stabbing in the dark.
>   I am trying to create a file that a user can download.
> So the file could be too large to just read() and write() all at once so
> I am 
> pretty sure I have to use this method defined for the req object:
>   sendfile(path[, offset, len])
> So I figure to store my file for them to download I need to create a temporary
> file with a name to give to sendfile.  Now if I create a named temporary
> file 
> using tempfile.NamedTemporaryFile(...) when I close the descriptor it is
> deleted.  
> So it seems I must use tempfile.mkstemp() to create the file.. but then
> I am 
> responsible for deleting it.  The files will be large and the disk might
> not 
> have enough room for too many of them.
> So in the end my questions are pretty much does what I am saying make sense
> and also how do I know when they are finished downloading the file when
> calling sendfile so that I can delete the file that I created with 
> mkstemp() ?
> Do I have to put something in cron that just hopes they are done downloading
> it?  I hope there is something better than that.
> Thanks in advance.
> -Ian
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