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Contents
require "crc32"
module Shamu
module Features
module Conditions
# Match against a limited percentage of total users.
class Percentage < Conditions::Condition
# (see Condition#match?)
def match?( context )
if context.user_id
( user_id_hash( context.user_id ) ^ toggle_crc ) % 100 < percentage
else
context.sticky!
Random.rand( 100 ) < percentage
end
end
private
def percentage
@percentage ||= [ config.to_i, 100 ].min
end
def user_id_hash( user_id )
if user_id.is_a?( Numeric )
return user_id
else
return user_id.sub( "-", "" ).to_i( 16 )
end
end
def toggle_crc
# Use the name of the toggle to provide consistent semi-random noise
# into the user selection process.
@toggle_crc ||= Crc32.calculate( toggle.name, toggle.name.length, 0 )
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems