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annotate modules/stdlib/lib/puppet/parser/functions/seeded_rand.rb @ 424:4a2ee7e3b110

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Update stdlib in case it fixed deprecation
author IBBoard <dev@ibboard.co.uk>
date Sun, 09 Oct 2022 10:34:32 +0100
parents d9352a684e62
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1 #
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2 # seeded_rand.rb
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3 #
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4 Puppet::Parser::Functions.newfunction(
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5 :seeded_rand,
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6 :arity => 2,
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7 :type => :rvalue,
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8 :doc => <<-DOC
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9 @summary
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10 Generates a random whole number greater than or equal to 0 and less than MAX, using the value of SEED for repeatable randomness.
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11
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12 @return
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13 random number greater than or equal to 0 and less than MAX
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14
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15 @example **Usage:**
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16 seeded_rand(MAX, SEED).
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17 MAX must be a positive integer; SEED is any string.
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19 Generates a random whole number greater than or equal to 0 and less
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20 than MAX, using the value of SEED for repeatable randomness. If SEED
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21 starts with "$fqdn:", this is behaves the same as `fqdn_rand`.
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22 DOC
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23 ) do |args|
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24 require 'digest/md5'
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25
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26 raise(ArgumentError, 'seeded_rand(): first argument must be a positive integer') unless function_is_integer([args[0]]) && args[0].to_i > 0
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27 raise(ArgumentError, 'seeded_rand(): second argument must be a string') unless args[1].is_a? String
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29 max = args[0].to_i
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30 seed = Digest::MD5.hexdigest(args[1]).hex
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31 Puppet::Util.deterministic_rand_int(seed, max)
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32 end