Some successful collision attacks have been carried out on sha1 with speculation that more are possible.
http://en.wikipedia.org/wiki/Cryptographic_hash_function#Cryptographic_hash_algorithms
No successful attacks have been shown on sha256, which makes it less likely that anybody will be able to engineer an asset hash collision in the future.
Tradeoff is more storage required for hashes, and more cpu to hash, though this is neglible compared to db operations and network access.
This is an extremely crude implemenation which almost works by accident. Nevertheless it does work.
It can be tested with the instructions at http://opensimulator.org/wiki/Feature_Proposals/Deduplicating_Asset_Service#Testing
It does not interact at all with the existing asset service or any data stored there.
This code is subject to change without notice and should not be used for anything other than gawking.
Telehub commits! They will eat your babies and corrupt your database while
they munch. DO NOT use anything from the first Telehub commit to this one.
FIRST GOOD COMMIT is the one FOLLOWING this one. You have been warned.
This is damage control es EstateSettings is not the place this can be put.
EstateSettings is nt unique to a region and therefore would introduce
a hard limit of one telehub per estate, completely shutting off the
option of having SL style telehubs, e.g. one per region. Whole
estate teleport routing can still be implemented id desiresd, this
way all options are open while the other way most options get closed
off.
Telehub settings now persist to the database and are saved across sim restarts. So-far this only works on MySQL. this is a work in progress, teleport routing is not yet implemented.
Using MyISAM proves vastly faster for persisting scene objects.
For instance, a scene object that took 9 seconds to persist before now takes 1. This also improves the experience of loading large OARs.
We don't use any of the transactional features of InnoDB.
The only thing that may have an impact is that InnoDB does row locking on inserts while MyISAM does table locking.
However, field reports say there is no noticeable difference.
Revert "Changed Friends table to have 165-sized varchars on PrincipalID and FriendID. The reason for this number is the following: there is a combined key of these 2 fields; apparently MySql can't handle keys larger than 1000 bytes; when the table is created with utf8 encoding, this combined key is bigger than 1000 bytes, and the migration fails. WARNING: this is not a new migration! People who have gone through this migration and failed should update the sizes of these fields manually."
This reverts commit 3fa54a156a.
New option added to save oar -profile=url. Migration on RegionStore making CreatorID be 255 chars.
Moved Handling of user UUID -> name requests to a new module UserManagement/UserManagementModule.
This will cause visual params to be persisted along with worn items. With
this, alpha and tattoo laters will be saved. Multiple layers MAY work, but
not tested because I don't use Viewer 2.
ok, so the estate stores now want their own migration files, but as it
happened the SQL definition were inside the Region migrations.
It seems better/cleaner to keep each 'store' separately updatable.
WARNING: any editing in the middle of the migration scripts (as opposite
to just appending to them) has the potential of messing up updates of
existing databases. As far as I can see, this one is (probably) safe,
the worst that could happen is the EstateStore migration silently fail
if the estate the tables are already there.
CHANGES THE ASSET SERVER PROTOCOL and means you CAN NOT MIX PRIOR VERSIONS
WITH LATER ONES. It may also eat your babies, yada, yada, yada.
The usual cautions for migrations to the assets table apply.
Coding: Can not guarantee nut free.
to start estates at 100. Existing databases having autcreated estates below
100 will see a gap in estate numbering. Other database implementors need to
ensure that no estates with numbers less that 100 are autocreated, unless
they are prepared to deal with the viewer's built-in notions of
Linden Mainland
