Forum: Ruby generate uuid

How Can I  generate uuid ? any references or Ideas could You people
suggest.I have not even heard about it?

Newb Newb wrote:
> How Can I  generate uuid ? any references or Ideas could You people
> suggest.I have not even heard about it?

http://en.wikipedia.org/wiki/Uuid#Ruby

Lex Williams wrote:
> Newb Newb wrote:
>   
>> How Can I  generate uuid ? any references or Ideas could You people
>> suggest.I have not even heard about it?
>>     
>
> http://en.wikipedia.org/wiki/Uuid#Ruby
>   
In Windows, you can use this code.  I'm not sure where I found this
from, so I can't tell you who to thank :P

require 'Win32API'

@uuid_create = Win32API.new('rpcrt4', 'UuidCreate', 'P', 'L')

def new_guid
  result = ' ' * 16
  @uuid_create.call(result)
  a, b, c, d, e, f, g, h = result.unpack('SSSSSSSS')
  sprintf('{%04X%04X-%04X-%04X-%04X-%04X%04X%04X}', a, b, c, d, e, f, g, 
h)
end

puts new_guid


Cheers,
Mohit.
8/31/2008 | 2:28 PM.

On Aug 28, 2008, at 2:43 AM, Newb Newb wrote:

> How Can I  generate uuid ? any references or Ideas could You people
> suggest.I have not even heard about it?


not mine, but here's a copy:

   http://s3.amazonaws.com/drawohara.com.ruby/uuid.rb


a @ http://codeforpeople.com/

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

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

>
> 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

On Sep 1, 2008, at 4:27 PM, Ezra Zygmuntowicz wrote:

>>        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.

My favorite trick is:

   uuid = `uuidgen`.strip

It has always been fast enough for my needs.

James Edward Gray II

On 1 sep 2008, at 23.48, James Gray wrote:

>>> require 'open-uri'
>> painfully slow if you need to make a bunch of uuid's.
>
> My favorite trick is:
>
>  uuid = `uuidgen`.strip
>
> It has always been fast enough for my needs.
>
> James Edward Gray II
>
>
       The variation I use is uuid = "x_#{`uuidgen`.strip}"

The advantage is that the generated uuid is always suitable as an xml ID

On Sep 1, 2008, at 14:48 , James Gray wrote:

> My favorite trick is:
>
>  uuid = `uuidgen`.strip
>
> It has always been fast enough for my needs.

that's nice. 10k real uuids in 1 minute is perfectly acceptable for
almost all cases. thanks.

% ./blah.rb 10000
# of iterations = 10000
                           user     system      total        real
null_time             0.000000   0.000000   0.000000 (  0.001486)
ezra                  0.200000   0.000000   0.200000 (  0.201678)
uuidgen               1.160000  12.630000  58.190000 ( 56.684045)

----

puts "# of iterations = #{max}"
Benchmark::bm(20) do |x|
   x.report("null_time") do
     for i in 0..max do
       # do nothing
     end
   end

   x.report("ezra") do
     for i in 0..max do
       fast_token
     end
   end

   x.report("uuidgen") do
     for i in 0..max do
       `uuidgen`.strip
     end
   end
end

On Sep 1, 2008, at 5:38 PM, Ryan Davis wrote:

> almost all cases. thanks.
> puts "# of iterations = #{max}"
>    end
>  end
>
>  x.report("uuidgen") do
>    for i in 0..max do
>      `uuidgen`.strip
>    end
>  end
> end
>
>


cfp:~ > cat a.rb
require 'open-uri'

uri = 'http://s3.amazonaws.com/drawohara.com.ruby/uuid.rb'

eval open(uri).read

a = Time.now.to_f

( n = 1000 ).times{ uuid = UUID.string }

b = Time.now.to_f

elapsed = b - a

puts "uuid/min : #{ n / elapsed * 60 }"



cfp:~ > ruby a.rb
uuid/min : 113947.784509223



it's kinda a POS, but with the addition of macaddr and a few other
tidbits (state using AR for instance) it's pretty dang good : 10 times
faster and pure ruby.






a @ http://codeforpeople.com/

Newb Newb wrote:
> How Can I  generate uuid ? any references or Ideas could You people
> suggest.I have not even heard about it?


sudo gem install guid


irb(main):001:0> require 'guid'
=> true
irb(main):002:0> Guid.new
=> b93e5a88-acf7-be64-af0b-6de00bd83fd3