X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=3rdparty%2Fmodules%2Fstdlib%2Flib%2Fpuppet%2Fparser%2Ffunctions%2Fseeded_rand.rb;fp=3rdparty%2Fmodules%2Fstdlib%2Flib%2Fpuppet%2Fparser%2Ffunctions%2Fseeded_rand.rb;h=44e27b8dc5451e404452bdfb9d2a14622727e8ac;hb=6963202b4b62c2816655ac9532521b018fdf83bd;hp=0000000000000000000000000000000000000000;hpb=a69999e580f8b3abd12446c2d6ad59e517651813;p=mirror%2Fdsa-puppet.git diff --git a/3rdparty/modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb b/3rdparty/modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb new file mode 100644 index 000000000..44e27b8dc --- /dev/null +++ b/3rdparty/modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb @@ -0,0 +1,22 @@ +Puppet::Parser::Functions::newfunction( + :seeded_rand, + :arity => 2, + :type => :rvalue, + :doc => <<-EOS +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`. + +EOS +) do |args| + require 'digest/md5' + + raise(ArgumentError, "seeded_rand(): first argument must be a positive integer") unless function_is_integer([args[0]]) and 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