class ActionDispatch::DebugExceptions

def call(env)
  _, headers, body = response = @app.call(env)
  if headers['X-Cascade'] == 'pass'
    body.close if body.respond_to?(:close)
    raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
  end
  response
rescue Exception => exception
  raise exception if env['action_dispatch.show_exceptions'] == false
  render_exception(env, exception)
end

def initialize(app, routes_app = nil)
  @app        = app
  @routes_app = routes_app
end

def log_error(env, wrapper)
  logger = logger(env)
  return unless logger
  exception = wrapper.exception
  trace = wrapper.application_trace
  trace = wrapper.framework_trace if trace.empty?
  ActiveSupport::Deprecation.silence do
    message = "\n#{exception.class} (#{exception.message}):\n"
    message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
    message << "  " << trace.join("\n  ")
    logger.fatal("#{message}\n\n")
  end
end

def logger(env)
  env['action_dispatch.logger'] || stderr_logger
end

def render(status, body)
  [status, {'Content-Type' => "text/html; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]]
end

def render_exception(env, exception)
  wrapper = ExceptionWrapper.new(env, exception)
  log_error(env, wrapper)
  if env['action_dispatch.show_detailed_exceptions']
    template = ActionView::Base.new([RESCUES_TEMPLATE_PATH],
      :request => Request.new(env),
      :exception => wrapper.exception,
      :application_trace => wrapper.application_trace,
      :framework_trace => wrapper.framework_trace,
      :full_trace => wrapper.full_trace,
      :routes_inspector => routes_inspector(exception),
      :source_extract => wrapper.source_extract,
      :line_number => wrapper.line_number,
      :file => wrapper.file
    )
    file = "rescues/#{wrapper.rescue_template}"
    body = template.render(:template => file, :layout => 'rescues/layout')
    render(wrapper.status_code, body)
  else
    raise exception
  end
end

def routes_inspector(exception)
  if @routes_app.respond_to?(:routes) && (exception.is_a?(ActionController::RoutingError) || exception.is_a?(ActionView::Template::Error))
    ActionDispatch::Routing::RoutesInspector.new(@routes_app.routes.routes)
  end
end

def stderr_logger
  @stderr_logger ||= ActiveSupport::Logger.new($stderr)
end