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Excluded host requests still makes calls to Redis. #482

@mosca1337

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@mosca1337

Excluded host requests still makes calls to Redis. It would be great if the ab_test method simply returned the control instead of querying for an alternative.

    def ab_test(metric_descriptor, control = nil, *alternatives)
      if !exclude_visitor?
        begin
          experiment = ExperimentCatalog.find_or_initialize(metric_descriptor, control, *alternatives)
          alternative = if Split.configuration.enabled
            experiment.save
            trial = Trial.new(:user => ab_user, :experiment => experiment,
                :override => override_alternative(experiment.name), :exclude => exclude_visitor?,
                :disabled => split_generically_disabled?)
            alt = trial.choose!(self)
            alt ? alt.name : nil
          else
            control_variable(experiment.control)
          end
        rescue Errno::ECONNREFUSED, Redis::BaseError, SocketError => e
          raise(e) unless Split.configuration.db_failover
          Split.configuration.db_failover_on_db_error.call(e)

          if Split.configuration.db_failover_allow_parameter_override
            alternative = override_alternative(experiment.name) if override_present?(experiment.name)
            alternative = control_variable(experiment.control) if split_generically_disabled?
          end
        ensure
          alternative ||= control_variable(experiment.control)
        end
      else
        alternative = control
      end

      if block_given?
        metadata = trial ? trial.metadata : {}
        yield(alternative, metadata)
      else
        alternative
      end
    end

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