rollout.rb in rollout-2.4.2

- old
+ new

@@ -2,10 +2,12 @@
 require "zlib"
 require "set"
 require "json"
 
 class Rollout
+  RAND_BASE = (2**32 - 1) / 100.0
+  
   class Feature
     attr_accessor :groups, :users, :percentage, :data
     attr_reader :name, :options
 
     def initialize(name, string = nil, opts = {})
@@ -86,11 +88,11 @@
       def id_user_by
         @options[:id_user_by] || :id
       end
 
       def user_in_percentage?(user)
-        Zlib.crc32(user_id_for_percentage(user)) % 100_000 < @percentage * 1_000
+        Zlib.crc32(user_id_for_percentage(user)) < RAND_BASE * @percentage
       end
 
       def user_id_for_percentage(user)
         if @options[:randomize_percentage]
           user_id(user).to_s + @name.to_s
@@ -279,9 +281,13 @@
       with_feature(feature) { |f| f.clear }
       @storage.del(key(feature))
     end
 
     @storage.del(features_key)
+  end
+
+  def exists?(feature)
+    @storage.exists(key(feature))
   end
 
   private
 
   def key(name)