[Opensim-dev] Thoughts on UUID

[Sean Dague]

On Wed, Apr 09, 2008 at 09:57:10PM +0300, Jani Pirkola wrote:
> Dear Sean, Charles,
> 
> I have been wondering for a while if it could be a good idea to use hash
> values calculated from content instead of random UID for assets (SHA1 could
> be used for that). If you upload exactly the same asset to two different
> OpenSim grids, the viewers could use the cached version instead of
> downloading it twice. I don't know if this is possible, but could help
> reducing the bandwidth needs. We could then also make a "standard set of
> assets" freely available for everyone and if everybody started to use them,
> the users would get immediate benefit from not needing to load same assets
> over and over again.

Yeh, the option to do SHA1 UUID generation is a good idea.  I had
actually proposed this on IRC and in Zero's office hours a month or so
ago.  I'd definitely like to implement a SHA1 based UUID generator for
assets as that could simplify our stock content quite a bit.

> We have at realXtend web site some free assets already available and we
> intend to grow that library as we continue our work. Toni Alatalo (antont)
> is already using content hash elsewhere (not in realXtend) and could provide
> some info if you think this could be a good idea.

I think this has a lot of possibilities.  Something that would be nifty
is a standard format for external content repositories, so it would be
easy to point the sim or asset server at them to pull down automatically
and put into their environment.  People could then publish their freely
available assets for the taking merely by structuring them in the right
ways.

> Or is the viewer generating the UID? That would then require some changes to
> the client and would break the compatibility with SL Viewer..

I believe this whole thing can be done server side.  But someone can
connect me if I'm wrong.

    -Sean

-- 
__________________________________________________________________

Sean Dague                                       Mid-Hudson Valley
sean at dague dot net                            Linux Users Group
http://dague.net                                 http://mhvlug.org

There is no silver bullet.  Plus, werewolves make better neighbors
than zombies, and they tend to keep the vampire population down.
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