Mercurial > repos > other > Puppet
diff modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb @ 272:c42fb28cff86
Update to a newer Python module
This also pulls in an EPEL module (which we don't use) and a newer
stdlib version.
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Fri, 03 Jan 2020 19:56:04 +0000 |
| parents | |
| children | d9352a684e62 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb Fri Jan 03 19:56:04 2020 +0000 @@ -0,0 +1,24 @@ +# +# seeded_rand.rb +# +Puppet::Parser::Functions.newfunction( + :seeded_rand, + :arity => 2, + :type => :rvalue, + :doc => <<-DOC + Usage: `seeded_rand(MAX, SEED)`. MAX must be a positive integer; SEED is any string. + + Generates a random whole number greater than or equal to 0 and less + than MAX, using the value of SEED for repeatable randomness. If SEED + starts with "$fqdn:", this is behaves the same as `fqdn_rand`. +DOC +) do |args| + require 'digest/md5' + + raise(ArgumentError, 'seeded_rand(): first argument must be a positive integer') unless function_is_integer([args[0]]) && args[0].to_i > 0 + raise(ArgumentError, 'seeded_rand(): second argument must be a string') unless args[1].is_a? String + + max = args[0].to_i + seed = Digest::MD5.hexdigest(args[1]).hex + Puppet::Util.deterministic_rand(seed, max) +end