Puppet Function: etcd::prefix_range_end

Defined in:
lib/puppet/functions/etcd/prefix_range_end.rb
Function type:
Ruby 4.x API

Summary

Calculates the range-end for a given prefix. Can be used for the `range_end` parameter of `etcd_role_permission`, to grant prefix.

Overview

etcd::prefix_range_end(String $prefix) ⇒ Any

Parameters:

  • prefix (String) —

    The prefix key to calculate the range-end for

Returns:

  • (Any) —

    The range-end for the given prefix.



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# File 'lib/puppet/functions/etcd/prefix_range_end.rb', line 6

Puppet::Functions.create_function(:'etcd::prefix_range_end') do
  # @param prefix
  #   The prefix key to calculate the range-end for
  #
  # @return
  #   The range-end for the given prefix.
  dispatch :prefix_range_end do
    param 'String', :prefix
  end

  def prefix_range_end(prefix)
    prefix_bytes = prefix.bytes
    range_end = prefix_bytes.dup
    (range_end.length - 1).downto(0) do |i|
      next unless range_end[i] < 0xff
      range_end[i] += 1
      range_end = range_end[0..i]
      return range_end.pack('c*')
    end
  end
end