require 'action_dispatch/http/request' require 'action_dispatch/middleware/exception_wrapper' require 'action_dispatch/routing/inspector' module ActionDispatch # This middleware is responsible for logging exceptions and # showing a debugging page in case the request is local. class DebugExceptions RESCUES_TEMPLATE_PATH = File.expand_path('../templates', __FILE__) def initialize(app, routes_app = nil) @app = app @routes_app = routes_app end 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 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 render(status, body) [status, {'Content-Type' => "text/html; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]] 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 stderr_logger @stderr_logger ||= ActiveSupport::Logger.new($stderr) 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 end end