[mod_python] streaming tar and/or zip files?

Go to www.modpython.org and type 'zip' into the search box. This will
yield some past discussion on this. I can't remember offhand what the
outcome of the discssion was last time and whether a satisfactory
solution was found or not.

Graham

On 30/06/07, Matthew Dennis <mdennis at merfer.net> wrote:
> This may not be the appropriate list, my apologies if that is indeed the
> case...
>
> I need to push from mod_python a file archive of sorts.  Any of tar, tar.gz
> or zip will work (I'm also open to other suggestions).  The requirement is
> that I can package several other "files" into it, compressed or not.  I have
> no disk to write to and finite memory to deal with but the "files" I'm
> outputting are quite large (much larger than can fit in memory), thus I need
> to stream them directly out.  The reason I put "files" in quotes is because
> they are not really files, but dynamic content that is generated on the fly.
>  ZipOutputStream from Java is a example of what I'm talking about if anyone
> is familiar with it, as are other such streams.  I don't know the size of
> the content until after it is all generated so there is no way to populate a
> TarInfo object with the size et cetera and make my dynamic content look like
> a file (which it doesn't seem I can do anyway as gettarinfo() tries to call
> .fileno() which doesn't exist on any file like object I would create).
>
> In other words, something like:
>
> output = TarFileStream(someFileObj)
>
> output.addEntry("file_1.txt")
> out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>
> output.addEntry("file_2.txt")
>  out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>
> ...
>
> output.addEntry("file_N.txt")
> out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>  out.write( /*some dynamically generated content */ )
>
> output.close()
>
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