diff options
Diffstat (limited to 'actionpack/lib/action_dispatch/middleware/show_exceptions.rb')
| -rw-r--r-- | actionpack/lib/action_dispatch/middleware/show_exceptions.rb | 173 |
1 files changed, 29 insertions, 144 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb index a765c23dae..836136eb95 100644 --- a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb +++ b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb @@ -1,172 +1,57 @@ -require 'active_support/core_ext/exception' -require 'action_controller/metal/exceptions' -require 'active_support/notifications' require 'action_dispatch/http/request' +require 'action_dispatch/middleware/exception_wrapper' module ActionDispatch - # This middleware rescues any exception returned by the application and renders - # nice exception pages if it's being rescued locally. + # This middleware rescues any exception returned by the application + # and calls an exceptions app that will wrap it in a format for the end user. + # + # The exceptions app should be passed as parameter on initialization + # of ShowExceptions. Everytime there is an exception, ShowExceptions will + # store the exception in env["action_dispatch.exception"], rewrite the + # PATH_INFO to the exception status code and call the rack app. + # + # If the application returns a "X-Cascade" pass response, this middleware + # will send an empty response as result with the correct status code. + # If any exception happens inside the exceptions app, this middleware + # catches the exceptions and returns a FAILSAFE_RESPONSE. class ShowExceptions - RESCUES_TEMPLATE_PATH = File.join(File.dirname(__FILE__), 'templates') - - cattr_accessor :rescue_responses - @@rescue_responses = Hash.new(:internal_server_error) - @@rescue_responses.update({ - 'ActionController::RoutingError' => :not_found, - 'AbstractController::ActionNotFound' => :not_found, - 'ActiveRecord::RecordNotFound' => :not_found, - 'ActiveRecord::StaleObjectError' => :conflict, - 'ActiveRecord::RecordInvalid' => :unprocessable_entity, - 'ActiveRecord::RecordNotSaved' => :unprocessable_entity, - 'ActionController::MethodNotAllowed' => :method_not_allowed, - 'ActionController::NotImplemented' => :not_implemented, - 'ActionController::InvalidAuthenticityToken' => :unprocessable_entity - }) - - cattr_accessor :rescue_templates - @@rescue_templates = Hash.new('diagnostics') - @@rescue_templates.update({ - 'ActionView::MissingTemplate' => 'missing_template', - 'ActionController::RoutingError' => 'routing_error', - 'AbstractController::ActionNotFound' => 'unknown_action', - 'ActionView::Template::Error' => 'template_error' - }) - FAILSAFE_RESPONSE = [500, {'Content-Type' => 'text/html'}, ["<html><body><h1>500 Internal Server Error</h1>" << "If you are the administrator of this website, then please read this web " << "application's log file and/or the web server's log file to find out what " << "went wrong.</body></html>"]] - def initialize(app, consider_all_requests_local = false) + def initialize(app, exceptions_app) @app = app - @consider_all_requests_local = consider_all_requests_local + @exceptions_app = exceptions_app end def call(env) begin - status, headers, body = @app.call(env) - exception = nil - - # Only this middleware cares about RoutingError. So, let's just raise - # it here. - if headers['X-Cascade'] == 'pass' - raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}" - end + response = @app.call(env) rescue Exception => exception raise exception if env['action_dispatch.show_exceptions'] == false end - exception ? render_exception(env, exception) : [status, headers, body] + response || render_exception(env, exception) end private - def render_exception(env, exception) - log_error(exception) - exception = original_exception(exception) - - request = Request.new(env) - if @consider_all_requests_local || request.local? - rescue_action_locally(request, exception) - else - rescue_action_in_public(exception) - end - rescue Exception => failsafe_error - $stderr.puts "Error during failsafe response: #{failsafe_error}\n #{failsafe_error.backtrace * "\n "}" - FAILSAFE_RESPONSE - end - - # Render detailed diagnostics for unhandled exceptions rescued from - # a controller action. - def rescue_action_locally(request, exception) - template = ActionView::Base.new([RESCUES_TEMPLATE_PATH], - :request => request, - :exception => exception, - :application_trace => application_trace(exception), - :framework_trace => framework_trace(exception), - :full_trace => full_trace(exception) - ) - file = "rescues/#{@@rescue_templates[exception.class.name]}.erb" - body = template.render(:file => file, :layout => 'rescues/layout.erb') - render(status_code(exception), body) - end - # Attempts to render a static error page based on the - # <tt>status_code</tt> thrown, or just return headers if no such file - # exists. At first, it will try to render a localized static page. - # For example, if a 500 error is being handled Rails and locale is :da, - # it will first attempt to render the file at <tt>public/500.da.html</tt> - # then attempt to render <tt>public/500.html</tt>. If none of them exist, - # the body of the response will be left empty. - def rescue_action_in_public(exception) - status = status_code(exception) - locale_path = "#{public_path}/#{status}.#{I18n.locale}.html" if I18n.locale - path = "#{public_path}/#{status}.html" - - if locale_path && File.exist?(locale_path) - render(status, File.read(locale_path)) - elsif File.exist?(path) - render(status, File.read(path)) - else - render(status, '') - end - end - - def status_code(exception) - Rack::Utils.status_code(@@rescue_responses[exception.class.name]) - end - - def render(status, body) - [status, {'Content-Type' => "text/html; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]] - end - - def public_path - defined?(Rails.public_path) ? Rails.public_path : 'public_path' - end - - def log_error(exception) - return unless logger - - 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 << " " << application_trace(exception).join("\n ") - logger.fatal("#{message}\n\n") - end - end - - def application_trace(exception) - clean_backtrace(exception, :silent) - end - - def framework_trace(exception) - clean_backtrace(exception, :noise) - end - - def full_trace(exception) - clean_backtrace(exception, :all) - end - - def clean_backtrace(exception, *args) - defined?(Rails) && Rails.respond_to?(:backtrace_cleaner) ? - Rails.backtrace_cleaner.clean(exception.backtrace, *args) : - exception.backtrace - end - - def logger - defined?(Rails.logger) ? Rails.logger : Logger.new($stderr) - end - - def original_exception(exception) - if registered_original_exception?(exception) - exception.original_exception - else - exception - end + def render_exception(env, exception) + wrapper = ExceptionWrapper.new(env, exception) + status = wrapper.status_code + env["action_dispatch.exception"] = wrapper.exception + env["PATH_INFO"] = "/#{status}" + response = @exceptions_app.call(env) + response[1]['X-Cascade'] == 'pass' ? pass_response(status) : response + rescue Exception => failsafe_error + $stderr.puts "Error during failsafe response: #{failsafe_error}\n #{failsafe_error.backtrace * "\n "}" + FAILSAFE_RESPONSE end - def registered_original_exception?(exception) - exception.respond_to?(:original_exception) && @@rescue_responses.has_key?(exception.original_exception.class.name) + def pass_response(status) + [status, {"Content-Type" => "text/html; charset=#{Response.default_charset}", "Content-Length" => "0"}, []] end end end |