rescuable.rb

module Rescuable
  extend ActiveSupport::Concern

  module ClassMethods
    def rescue_methods(*methods, from: nil, &block)
      raise ArgumentError, 'Requires exception to rescue from' if from.blank?
      from = [from] if !from.respond_to?(:any?)

      methods.each do |method|
        old_method = "_#{method}".to_sym
        alias_method old_method, method
        define_method method do |*args|
          begin
            send(old_method, *args)
          rescue => e
            if from.any? { |klass| e.is_a?(klass) }
              return block.call(e)
            else
              raise e
            end
          end
        end
      end
    end
  end
end

rescuable_example.rb

require 'rescuable'

FailingClass.class_eval do
  include Rescuable

  rescue_methods :list, from: Redis::BaseConnectionError do |e|
    report_error(e)
    Set.new
  end

  rescue_methods :hash, from: Redis::BaseConnectionError do |e|
    report_error(e)
    {}
  end

  rescue_methods :add, :remove, :clear, :enable, :disable, from: Redis::BaseConnectionError do |e|
    report_error(e)
    true
  end

  def self.report_error(e)
    Rails.logger.error e.message
    Prometheus::Client.registry
      .get(:errors)
      .increment(error: e.class.name.camelcase)
  end
end