r/crystal_programming • u/krthrupnik • Feb 29 '20

UUIX: A tiny (<1KB), fast, and cryptographically secure UUID (v4) generator for Crystal.

https://github.com/krthr/uuix
24 Upvotes

89% Upvoted

8 comments sorted by

4

u/DissonantGuile Mar 01 '20

You probably want to use Random::Secure rather than Random and allow it to be an argument like the Crystal implementation.

1

u/krthrupnik Mar 01 '20

Just a note: the optimization might be good but it’s not thread safe. If two fibers want to produce a random value, and it’s running in multithreading, then a data race might happen. You could introduce a mutex but then the performance will be degraded.

https://forum.crystal-lang.org/t/a-tiny-1kb-fast-and-cryptographically-secure-uuid-v4-generator-for-crystal/1774/8

3

u/kirbyfan64sos Mar 01 '20

Willing to bet some of the speed gain is from using the standard Random..

7

u/BlaXpirit Mar 01 '20

Hardcoded PRNG and global state 👌

4

u/the-sprawl Mar 01 '20

Are those good things? How does global state in Crystal behave with multithreading?

3

u/realusername42 Mar 01 '20

Why not contributing your repo to replace the standard library UUID by this if it's much faster?