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Last change
on this file since 30960 was 30960, checked in by davidb, 7 years ago |
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Switch to using Puppet to provision machine. Strongly based on files developed for spark-hdfs cluster
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File size:
794 bytes
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| 1 | Puppet::Parser::Functions::newfunction(
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| 2 | :seeded_rand,
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| 3 | :arity => 2,
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| 4 | :type => :rvalue,
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| 5 | :doc => <<-EOS
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| 6 | Usage: `seeded_rand(MAX, SEED)`. MAX must be a positive integer; SEED is any string.
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| 7 |
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| 8 | Generates a random whole number greater than or equal to 0 and less
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| 9 | than MAX, using the value of SEED for repeatable randomness. If SEED
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| 10 | starts with "$fqdn:", this is behaves the same as `fqdn_rand`.
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| 11 |
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| 12 | EOS
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| 13 | ) do |args|
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| 14 | require 'digest/md5'
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| 15 |
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| 16 | raise(ArgumentError, "seeded_rand(): first argument must be a positive integer") unless function_is_integer([args[0]]) and args[0].to_i > 0
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| 17 | raise(ArgumentError, "seeded_rand(): second argument must be a string") unless args[1].is_a? String
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| 18 |
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| 19 | max = args[0].to_i
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| 20 | seed = Digest::MD5.hexdigest(args[1]).hex
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| 21 | Puppet::Util.deterministic_rand(seed,max)
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| 22 | end
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