Censoring wordy exceptions.

censored_exception.rb

require 'active_support/backtrace_cleaner'

module CensoredException
  def self.extended(base)
    orig_backtrace = base.method(:backtrace)
    base.define_singleton_method(:backtrace) do
      BACKTRACE_CLEANER.clean(orig_backtrace.call)
    end
  end

  BACKTRACE_CLEANER = ActiveSupport::BacktraceCleaner.new
  [
    %r{/gems/sinatra-\d},
    %r{/gems/rack(-protection)?-\d},
    %r{/gems/shotgun-\d},
    %r{/bin/shotgun},
    %r{/gems/thin-\d},
    %r{/gems/eventmachine-\d},
  ].each do |pattern|
    BACKTRACE_CLEANER.add_silencer {|line| line =~ pattern }
  end
end

sinatra_app.rb

require 'sinatra'
require 'censored_exception'

class App < Sinatra::Base
  def handle_exception!(boom)
    boom.extend(CensoredException)
    super(boom)
  end
end