Wrapping exceptions in Ruby

gistfile1.rb

class CustomError < StandardError
  def initialize(e = nil)
    super e
    set_backtrace e.backtrace if e
  end
end

def run
  r = Runner.new
  r.fail
end

class Runner
  def fail
    _fail
  end

  def _fail
    service = RunnerService.new
    service.fail
  rescue StandardError => e
    raise CustomError.new(e)
  end
end

class RunnerService
  def fail
    _fail
  end

  def _fail
    raise StandardError.new('Service failed')
  end
end

begin
  run
rescue CustomError => e
  puts e.message
  puts '  ' + e.backtrace.join("\n  ")
end