dumping arbitrary structures

dumping arbitrary structures

[farazs]

hi

        I'm looking for something which can dump *arbitrary* guile
structures to a byte(or scm_t_bits) array - so that they may be
transmitted (send()) and recieved and reconstructed cleanly on the
other end. It could also be used to save data structures to a file
and restore them later on.

If anyone has done this please point it out to me.

- faraz < farazs@yapost.com >




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Re: dumping arbitrary structures

[Paul Jarc]

farazs@yapost.com wrote:
>         I'm looking for something which can dump *arbitrary* guile
> structures to a byte(or scm_t_bits) array - so that they may be
> transmitted (send()) and recieved and reconstructed cleanly on the
> other end. It could also be used to save data structures to a file
> and restore them later on.

(with-output-to-string (lambda () (write object)))
That will work for built-in data types like lists, vectors, numbers,
strings, symbols, etc.  User-defined records and classes are a harder
problem.


paul


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Re: dumping arbitrary structures

[Andreas Rottmann]

prj@po.cwru.edu (Paul Jarc) writes:

> farazs@yapost.com wrote:
>>         I'm looking for something which can dump *arbitrary* guile
>> structures to a byte(or scm_t_bits) array - so that they may be
>> transmitted (send()) and recieved and reconstructed cleanly on the
>> other end. It could also be used to save data structures to a file
>> and restore them later on.
>
> (with-output-to-string (lambda () (write object)))
> That will work for built-in data types like lists, vectors, numbers,
> strings, symbols, etc.  User-defined records and classes are a harder
> problem.
>
For classes you might use something like described in
http://unknownlamer.org/code/guile-web-manual.html#SEC4.

Andy
-- 
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Re: dumping arbitrary structures

[Clinton Ebadi]

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On Monday 26 January 2004 18:50, Andreas Rottmann wrote:
> prj@po.cwru.edu (Paul Jarc) writes:
> > farazs@yapost.com wrote:
> >>         I'm looking for something which can dump *arbitrary* guile
> >> structures to a byte(or scm_t_bits) array - so that they may be
> >> transmitted (send()) and recieved and reconstructed cleanly on the
> >> other end. It could also be used to save data structures to a file
> >> and restore them later on.
> >
> > (with-output-to-string (lambda () (write object)))
> > That will work for built-in data types like lists, vectors, numbers,
> > strings, symbols, etc.  User-defined records and classes are a harder
> > problem.
>
> For classes you might use something like described in
> http://unknownlamer.org/code/guile-web-manual.html#SEC4.

Speaking of which, I just uploaded 0.4.0 which features a new serializer. It
should actually work this time around. It is still a *huge* hack and *very*
inefficient. I'm not working too much on guile-web anymore (or programming in
general...I've gotten lazy and spend my time chasing girls and being in a
metal band that isn't going anywhere).

- --
http://unknownlamer.org
AIM:unknownlamer IRC:unknown_lamer@freenode#hprog
I use Free Software because I value freedom over features.
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Re: dumping arbitrary structures

[farazs]

> For classes you might use something like described in
> http://unknownlamer.org/code/guile-web-manual.html#SEC4.
>

    The object-serializer in guile-web is pretty much what
I want except for the "object" part. I don't particularly fancy
OOP (actually haven't seen too much).

    Secondly, my actual motive for asking this question was
not exactly to exchange data over the web ; I want to use guile
on a Linux cluster along with PVM : the idea is to use PVM to
beam down thunks of Scheme to execute on the slave nodes.

    Ultimately the conversion to string approach is a bit too
slow for my purposes. I would prefer a more low level approach
that works with all in-built types and can be extended to smobs
if needed by something like set_smob_dump(tag, funcptr) and
set_smob_restore(tag, funcptr)

     But more pertinently I would like to raise the question of
serializing everything : The ability to save closures, thunks,
continuations, etc. to files can in itself allow us to do some
pretty funny stuff. We could have truly persistent environments -
you know how after a days work on emacs you can save the file
and resume work on it later.

   Imagine this message :

Guile dumped core... Pick it up tomorrow and continue


   This feature is mentioned in the TODO list of guile-web,
which means that atleast Clinton is thinking on the lines that
I am. I wanna know if anyone else finds it useful too?

- faraz < farazs@yapost.com >


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Re: dumping arbitrary structures

[Thien-Thi Nguyen]

   From: farazs@yapost.com
   Date: Wed, 28 Jan 2004 15:39:20 +0800 (HKT)

   Ultimately the conversion to string approach is a bit too
   slow for my purposes.

what are your requirements, quantitatively?

   But more pertinently I would like to raise the question of
   serializing everything : [...] We could have truly persistent
   environments [...]

that's what a database is for, generally.  just a SMOP (you could
revive gush or beguiled); arrange for the daemon to checkpoint to
a database backend either automatically or on demand.

thi


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Re: dumping arbitrary structures

[Clinton Ebadi]

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On Wednesday 28 January 2004 02:39, farazs@yapost.com wrote:
> > For classes you might use something like described in
> > http://unknownlamer.org/code/guile-web-manual.html#SEC4.
>
>     The object-serializer in guile-web is pretty much what
> I want except for the "object" part. I don't particularly fancy
> OOP (actually haven't seen too much).

By "object" I meant any Scheme data, not objects in the OOP sense. I do make 
heavy use of GOOPS but only because it provides an easy way to identify types 
and to do some /very/ unorthodox things (e.g. mass changing values in place) 
by abusing some of the internal procedures (The serializer is in essence a 
hack so I'm allowed to do that ;) ).

- -- 
http://unknownlamer.org
AIM:unknownlamer IRC:unknown_lamer@freenode#hprog
I use Free Software because I value freedom over features.
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