Re: [pygame] Use of PyScheme for game projects

[James Hofmann <jwhinfinity@xxxxxxxxx>]

--- andrew baker <failrate@xxxxxxxxx> wrote:

> Howdy,
> 
> I've been pondering alternative methods to allowing
> unknown persons to
> submit game code in my game engine, e.g. player
> created levels, characters,
> monsters and items, but of course sandboxing Python
> code is nontrivial.
> I've hit upon using a Scheme interpreter in Python
> to potentially solve this
> problem, with a possible variation on parsing to
> make the Scheme code appear
> more Pythonic.  Has anyone had similar success or
> failure or a better
> understanding of Scheme than me who explain why this
> is A) awesome or B) teh
> suck.
> 
> And, yes, I know how daft it may seem to embed
> another interpreted language
> inside an interpreted language, but I'm expecting
> rather small Scheme
> patterns, and Python in its current state simply
> cannot be sandboxed, and I
> think I might actually hate C++. :D
> 
> Thanks,
> 
> -- 
> Andrew Ulysses Baker
> "failrate"
> 

Had the exact same problem. You (should) be able to
base a safe Python sub-interpreter off of this code:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/496746

When I tested it a little bit(haven't actually
implemented in my project) I found that I had to
disable one of the asserts to make it work as an
imported module; and I didn't actually execute the
eval with the time-out thread after it ran the tests,
but instead flagged the code as safe. This means that
I've left it open to crash programs, but in theory it
should otherwise be safe and perform about as well as
my main code.


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com