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Contents
# frozen_string_literal: true
require 'digest'
module Flagsmith
module Engine
module Utils
# HashFunction
module HashFunc
# Given a list of object ids, get a floating point number between 0 (inclusive) and
# 100 (exclusive) based on the hash of those ids. This should give the same value
# every time for any list of ids.
#
# :param object_ids: list of object ids to calculate the hash for
# :param iterations: num times to include each id in the generated string to hash
# :return: (float) number between 0 (inclusive) and 100 (exclusive)
def hashed_percentage_for_object_ids(object_ids, iterations = 1)
to_hash = (object_ids.map(&:to_s) * iterations).flatten.join(',')
hashed_value = Digest::MD5.hexdigest(to_hash.encode('utf-8'))
hashed_value_as_int = hashed_value.to_i(16)
value = ((hashed_value_as_int % 9999).to_f / 9998) * 100
# since we want a number between 0 (inclusive) and 100 (exclusive), in the
# unlikely case that we get the exact number 100, we call the method again
# and increase the number of iterations to ensure we get a different result
return hashed_percentage_for_object_ids(object_ids, iterations + 1) if value == 100
value
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems