mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
171 lines
6.3 KiB
Ruby
171 lines
6.3 KiB
Ruby
require 'active_support/core_ext/exception'
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require 'active_support/notifications'
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require 'action_dispatch/http/request'
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module ActionDispatch
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# This middleware rescues any exception returned by the application and renders
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# nice exception pages if it's being rescued locally.
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class ShowExceptions
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RESCUES_TEMPLATE_PATH = File.join(File.dirname(__FILE__), 'templates')
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cattr_accessor :rescue_responses
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@@rescue_responses = Hash.new(:internal_server_error)
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@@rescue_responses.update({
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'ActionController::RoutingError' => :not_found,
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'AbstractController::ActionNotFound' => :not_found,
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'ActiveRecord::RecordNotFound' => :not_found,
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'ActiveRecord::StaleObjectError' => :conflict,
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'ActiveRecord::RecordInvalid' => :unprocessable_entity,
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'ActiveRecord::RecordNotSaved' => :unprocessable_entity,
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'ActionController::MethodNotAllowed' => :method_not_allowed,
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'ActionController::NotImplemented' => :not_implemented,
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'ActionController::InvalidAuthenticityToken' => :unprocessable_entity
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})
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cattr_accessor :rescue_templates
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@@rescue_templates = Hash.new('diagnostics')
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@@rescue_templates.update({
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'ActionView::MissingTemplate' => 'missing_template',
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'ActionController::RoutingError' => 'routing_error',
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'AbstractController::ActionNotFound' => 'unknown_action',
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'ActionView::Template::Error' => 'template_error'
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})
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FAILSAFE_RESPONSE = [500, {'Content-Type' => 'text/html'},
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["<html><body><h1>500 Internal Server Error</h1>" <<
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"If you are the administrator of this website, then please read this web " <<
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"application's log file and/or the web server's log file to find out what " <<
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"went wrong.</body></html>"]]
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def initialize(app, consider_all_requests_local = false)
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@app = app
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@consider_all_requests_local = consider_all_requests_local
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end
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def call(env)
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begin
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status, headers, body = @app.call(env)
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exception = nil
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# Only this middleware cares about RoutingError. So, let's just raise
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# it here.
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if headers['X-Cascade'] == 'pass'
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raise ActionController::RoutingError, "No route matches #{env['PATH_INFO'].inspect}"
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end
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rescue Exception => exception
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raise exception if env['action_dispatch.show_exceptions'] == false
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end
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exception ? render_exception(env, exception) : [status, headers, body]
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end
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private
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def render_exception(env, exception)
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log_error(exception)
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exception = original_exception(exception)
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request = Request.new(env)
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if @consider_all_requests_local || request.local?
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rescue_action_locally(request, exception)
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else
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rescue_action_in_public(exception)
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end
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rescue Exception => failsafe_error
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$stderr.puts "Error during failsafe response: #{failsafe_error}\n #{failsafe_error.backtrace * "\n "}"
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FAILSAFE_RESPONSE
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end
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# Render detailed diagnostics for unhandled exceptions rescued from
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# a controller action.
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def rescue_action_locally(request, exception)
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template = ActionView::Base.new([RESCUES_TEMPLATE_PATH],
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:request => request,
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:exception => exception,
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:application_trace => application_trace(exception),
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:framework_trace => framework_trace(exception),
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:full_trace => full_trace(exception)
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)
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file = "rescues/#{@@rescue_templates[exception.class.name]}.erb"
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body = template.render(:file => file, :layout => 'rescues/layout.erb')
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render(status_code(exception), body)
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end
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# Attempts to render a static error page based on the
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# <tt>status_code</tt> thrown, or just return headers if no such file
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# exists. At first, it will try to render a localized static page.
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# For example, if a 500 error is being handled Rails and locale is :da,
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# it will first attempt to render the file at <tt>public/500.da.html</tt>
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# then attempt to render <tt>public/500.html</tt>. If none of them exist,
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# the body of the response will be left empty.
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def rescue_action_in_public(exception)
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status = status_code(exception)
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locale_path = "#{public_path}/#{status}.#{I18n.locale}.html" if I18n.locale
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path = "#{public_path}/#{status}.html"
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if locale_path && File.exist?(locale_path)
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render(status, File.read(locale_path))
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elsif File.exist?(path)
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render(status, File.read(path))
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else
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render(status, '')
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end
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end
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def status_code(exception)
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Rack::Utils.status_code(@@rescue_responses[exception.class.name])
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end
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def render(status, body)
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[status, {'Content-Type' => 'text/html', 'Content-Length' => body.bytesize.to_s}, [body]]
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end
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def public_path
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defined?(Rails.public_path) ? Rails.public_path : 'public_path'
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end
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def log_error(exception)
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return unless logger
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ActiveSupport::Deprecation.silence do
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message = "\n#{exception.class} (#{exception.message}):\n"
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message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
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message << " " << application_trace(exception).join("\n ")
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logger.fatal("#{message}\n\n")
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end
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end
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def application_trace(exception)
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clean_backtrace(exception, :silent)
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end
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def framework_trace(exception)
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clean_backtrace(exception, :noise)
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end
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def full_trace(exception)
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clean_backtrace(exception, :all)
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end
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def clean_backtrace(exception, *args)
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defined?(Rails) && Rails.respond_to?(:backtrace_cleaner) ?
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Rails.backtrace_cleaner.clean(exception.backtrace, *args) :
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exception.backtrace
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end
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def logger
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defined?(Rails.logger) ? Rails.logger : Logger.new($stderr)
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end
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def original_exception(exception)
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if registered_original_exception?(exception)
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exception.original_exception
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else
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exception
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end
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end
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def registered_original_exception?(exception)
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exception.respond_to?(:original_exception) && @@rescue_responses.has_key?(exception.original_exception.class.name)
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end
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end
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end
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