46 lines
1.1 KiB
Ruby
46 lines
1.1 KiB
Ruby
#
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# fqdn_rotate.rb
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#
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module Puppet::Parser::Functions
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newfunction(:fqdn_rotate, :type => :rvalue, :doc => <<-EOS
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Rotates an array a random number of times based on a nodes fqdn.
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EOS
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) do |arguments|
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raise(Puppet::ParseError, "fqdn_rotate(): Wrong number of arguments " +
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"given (#{arguments.size} for 1)") if arguments.size < 1
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value = arguments[0]
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klass = value.class
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require 'digest/md5'
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unless [Array, String].include?(klass)
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raise(Puppet::ParseError, 'fqdn_rotate(): Requires either ' +
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'array or string to work with')
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end
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result = value.clone
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string = value.is_a?(String) ? true : false
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# Check whether it makes sense to rotate ...
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return result if result.size <= 1
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# We turn any string value into an array to be able to rotate ...
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result = string ? result.split('') : result
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elements = result.size
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srand(Digest::MD5.hexdigest([lookupvar('::fqdn'),arguments].join(':')).hex)
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rand(elements).times {
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result.push result.shift
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}
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result = string ? result.join : result
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return result
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end
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end
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# vim: set ts=2 sw=2 et :
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