gistfile1.rb

require 'zlib'

module FeatureFlags
  BETA_ACCOUNTS = %w(subdomain1 subdomain2)

  FLAGS = {
    :new_import_flow => {
      :percentage => 10,
      :account_subdomains => []
    },

    :last_emailed_with => {
      :percentage => 25,
      :account_subdomains => [
        'coolcustomer',
        'anothercoolcustomer'
      ]
    }
  }

  def self.enabled_for_account?(account, feature)
    if config = FLAGS[feature]
      return true if BETA_ACCOUNTS.include?(account.subdomain)
      return true if config[:account_subdomains] && config[:account_subdomains].include?(account.subdomain)
      return true if Zlib.crc32("#{feature}:#{account.id}") % 100 < config[:percentage]
    end
    false
  end
end