You only seed once, and with a poor quality source (time).

It's entirely possible to predict all your UUIDs, which makes them not universally unique.

Hello, I'm following from this Kong/kong#695 and sailorproject/sailor#58

I want to propose the following solution for the seeding issue:

1. Seeding: threads use output of require 'socket':gettime()
2. Seed needs to be confirmed by creating a file /temp_folder/[timestamp].uuid
3. If file exists already then get a new timestamp (retry 256 times by default)

This way we get a different seed for each thread. Production servers can run tmpfs (in-memory filesystem) to optimize speeds (no need to relay on database storage).

I know this has limitations, but who in the world is running more than 256 threads on a single microsecond?

https://onelinerhub.com/lua/how-to-generate-uuid

Hello,
Thanks a lot for this useful project!

I'm having an issue with the code line below

For my Lua version 5.2.4 (ubuntu), _VERSION seems not to be assigned and thus is set to nil. I had to modify the code and manually assign it to 5.2 to prevent it to fail.

The good news is, I don't have this issue with other versions.

Now, would it be sane to do the following right before line 178?

if lua_version == nil then
    lua_version = 5.2
end

Or maybe there is another way to circumvent this issue?
Thanks a lot for your time!

see this message http://article.gmane.org/gmane.comp.lang.lua.general/99722

Your library uses the same require string require"uuid" as luuid