class ActionDispatch::DebugExceptions

This middleware is responsible for logging exceptions and showing a debugging page in case the request is local.

Constants

RESCUES_TEMPLATE_PATH

Public Class Methods

new(app, routes_app = nil) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 11
def initialize(app, routes_app = nil)
  @app        = app
  @routes_app = routes_app
end

Public Instance Methods

call(env) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 16
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

Private Instance Methods

log_error(env, wrapper) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 79
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
logger(env) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 96
def logger(env)
  env['action_dispatch.logger'] || stderr_logger
end
render(status, body, format) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 75
def render(status, body, format)
  [status, {'Content-Type' => "#{format}; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]]
end
render_exception(env, exception) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 32
def render_exception(env, exception)
  wrapper = ExceptionWrapper.new(env, exception)
  log_error(env, wrapper)

  if env['action_dispatch.show_detailed_exceptions']
    request = Request.new(env)
    traces = wrapper.traces

    trace_to_show = 'Application Trace'
    if traces[trace_to_show].empty? && wrapper.rescue_template != 'routing_error'
      trace_to_show = 'Full Trace'
    end

    if source_to_show = traces[trace_to_show].first
      source_to_show_id = source_to_show[:id]
    end

    template = ActionView::Base.new([RESCUES_TEMPLATE_PATH],
      request: request,
      exception: wrapper.exception,
      traces: traces,
      show_source_idx: source_to_show_id,
      trace_to_show: trace_to_show,
      routes_inspector: routes_inspector(exception),
      source_extracts: wrapper.source_extracts,
      line_number: wrapper.line_number,
      file: wrapper.file
    )
    file = "rescues/#{wrapper.rescue_template}"

    if request.xhr?
      body = template.render(template: file, layout: false, formats: [:text])
      format = "text/plain"
    else
      body = template.render(template: file, layout: 'rescues/layout')
      format = "text/html"
    end
    render(wrapper.status_code, body, format)
  else
    raise exception
  end
end
routes_inspector(exception) click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 104
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
stderr_logger() click to toggle source
# File lib/action_dispatch/middleware/debug_exceptions.rb, line 100
def stderr_logger
  @stderr_logger ||= ActiveSupport::Logger.new($stderr)
end