From: Ezra Zygmuntowicz <ezmobius@...>
Date: 2008-09-02T06:27:02+09:00
Subject: Re: generate uuid


On Aug 31, 2008, at 6:12 PM, Heesob Park wrote:

> 2008/8/28 Newb Newb <hema@angleritech.com>:
>> How Can I  generate uuid ? any references or Ideas could You people
>> suggest.I have not even heard about it?
>
> You get get UUID on the WEB like this:
>
> require 'open-uri'
> uuid = open('http://www.famkruithof.net/uuid/uuidgen').
>         read.scan(/<h3>([-[:alnum:]]+)<\/h3>/).to_s
> puts uuid
>
> Regards,
>
> Park Heesob


One thing I;ve found is that all of the UUID generators are painfully  
slow if you need to make a bunch of uuid's. Here is a way to cheat,  
but do so at your own risk as this is not garaunteed to be as safe as  
a true uuid but in practice works very well.

    def fast_token
      values = [
        rand(0x0010000),
        rand(0x0010000),
        rand(0x0010000),
        rand(0x0010000),
        rand(0x0010000),
        rand(0x1000000),
        rand(0x1000000),
      ]
      "%04x%04x%04x%04x%04x%06x%06x" % values
    end


Cheers-
-Ezra