require 'active_support/core_ext/hash/reverse_merge' require 'fileutils' require 'rails/engine' module Rails # In Rails 3.0, a Rails::Application object was introduced which is nothing more than # an Engine but with the responsibility of coordinating the whole boot process. # # == Initialization # # Rails::Application is responsible for executing all railties and engines # initializers. It also executes some bootstrap initializers (check # Rails::Application::Bootstrap) and finishing initializers, after all the others # are executed (check Rails::Application::Finisher). # # == Configuration # # Besides providing the same configuration as Rails::Engine and Rails::Railtie, # the application object has several specific configurations, for example # "allow_concurrency", "cache_classes", "consider_all_requests_local", "filter_parameters", # "logger" and so forth. # # Check Rails::Application::Configuration to see them all. # # == Routes # # The application object is also responsible for holding the routes and reloading routes # whenever the files change in development. # # == Middlewares # # The Application is also responsible for building the middleware stack. # # == Booting process # # The application is also responsible for setting up and executing the booting # process. From the moment you require "config/application.rb" in your app, # the booting process goes like this: # # 1) require "config/boot.rb" to setup load paths # 2) require railties and engines # 3) Define Rails.application as "class MyApp::Application < Rails::Application" # 4) Run config.before_configuration callbacks # 5) Load config/environments/ENV.rb # 6) Run config.before_initialize callbacks # 7) Run Railtie#initializer defined by railties, engines and application. # One by one, each engine sets up its load paths, routes and runs its config/initializers/* files. # 9) Custom Railtie#initializers added by railties, engines and applications are executed # 10) Build the middleware stack and run to_prepare callbacks # 11) Run config.before_eager_load and eager_load if cache classes is true # 12) Run config.after_initialize callbacks # class Application < Engine autoload :Bootstrap, 'rails/application/bootstrap' autoload :Configuration, 'rails/application/configuration' autoload :Finisher, 'rails/application/finisher' autoload :Railties, 'rails/application/railties' autoload :RoutesReloader, 'rails/application/routes_reloader' class << self def inherited(base) raise "You cannot have more than one Rails::Application" if Rails.application super Rails.application = base.instance Rails.application.add_lib_to_load_path! ActiveSupport.run_load_hooks(:before_configuration, base.instance) end end attr_accessor :assets, :sandbox alias_method :sandbox?, :sandbox attr_reader :reloaders delegate :default_url_options, :default_url_options=, :to => :routes def initialize super @initialized = false @reloaders = [] end # This method is called just after an application inherits from Rails::Application, # allowing the developer to load classes in lib and use them during application # configuration. # # class MyApplication < Rails::Application # require "my_backend" # in lib/my_backend # config.i18n.backend = MyBackend # end # # Notice this method takes into consideration the default root path. So if you # are changing config.root inside your application definition or having a custom # Rails application, you will need to add lib to $LOAD_PATH on your own in case # you need to load files in lib/ during the application configuration as well. def add_lib_to_load_path! #:nodoc: path = config.root.join('lib').to_s $LOAD_PATH.unshift(path) if File.exists?(path) end def require_environment! #:nodoc: environment = paths["config/environment"].existent.first require environment if environment end # Reload application routes regardless if they changed or not. def reload_routes! routes_reloader.reload! end def routes_reloader #:nodoc: @routes_reloader ||= RoutesReloader.new end # Returns an array of file paths appended with a hash of directories-extensions # suitable for ActiveSupport::FileUpdateChecker API. def watchable_args files, dirs = config.watchable_files.dup, config.watchable_dirs.dup ActiveSupport::Dependencies.autoload_paths.each do |path| dirs[path.to_s] = [:rb] end [files, dirs] end # Initialize the application passing the given group. By default, the # group is :default but sprockets precompilation passes group equals # to assets if initialize_on_precompile is false to avoid booting the # whole app. def initialize!(group=:default) #:nodoc: raise "Application has been already initialized." if @initialized run_initializers(group, self) @initialized = true self end def initialized? @initialized end # Load the application and its railties tasks and invoke the registered hooks. # Check Rails::Railtie.rake_tasks for more info. def load_tasks(app=self) initialize_tasks super self end # Load the application console and invoke the registered hooks. # Check Rails::Railtie.console for more info. def load_console(app=self) initialize_console super self end # Stores some of the Rails initial environment parameters which # will be used by middlewares and engines to configure themselves. def env_config @env_config ||= super.merge({ "action_dispatch.parameter_filter" => config.filter_parameters, "action_dispatch.secret_token" => config.secret_token, "action_dispatch.show_exceptions" => config.action_dispatch.show_exceptions, "action_dispatch.show_detailed_exceptions" => config.consider_all_requests_local, "action_dispatch.logger" => Rails.logger, "action_dispatch.backtrace_cleaner" => Rails.backtrace_cleaner }) end # Returns the ordered railties for this application considering railties_order. def ordered_railties #:nodoc: @ordered_railties ||= begin order = config.railties_order.map do |railtie| if railtie == :main_app self elsif railtie.respond_to?(:instance) railtie.instance else railtie end end all = (railties.all - order) all.push(self) unless all.include?(self) order.push(:all) unless order.include?(:all) index = order.index(:all) order[index] = all order.reverse.flatten end end def initializers #:nodoc: Bootstrap.initializers_for(self) + super + Finisher.initializers_for(self) end def config #:nodoc: @config ||= Application::Configuration.new(find_root_with_flag("config.ru", Dir.pwd)) end def to_app self end def helpers_paths #:nodoc: config.helpers_paths end def call(env) env["ORIGINAL_FULLPATH"] = build_original_fullpath(env) super(env) end protected alias :build_middleware_stack :app def reload_dependencies? config.reload_classes_only_on_change != true || reloaders.map(&:updated?).any? end def default_middleware_stack ActionDispatch::MiddlewareStack.new.tap do |middleware| if rack_cache = config.action_controller.perform_caching && config.action_dispatch.rack_cache require "action_dispatch/http/rack_cache" middleware.use ::Rack::Cache, rack_cache end if config.force_ssl middleware.use ::ActionDispatch::SSL, config.ssl_options end if config.action_dispatch.x_sendfile_header.present? middleware.use ::Rack::Sendfile, config.action_dispatch.x_sendfile_header end if config.serve_static_assets middleware.use ::ActionDispatch::Static, paths["public"].first, config.static_cache_control end middleware.use ::Rack::Lock unless config.allow_concurrency middleware.use ::Rack::Runtime middleware.use ::Rack::MethodOverride middleware.use ::ActionDispatch::RequestId middleware.use ::Rails::Rack::Logger, config.log_tags # must come after Rack::MethodOverride to properly log overridden methods middleware.use ::ActionDispatch::ShowExceptions, config.exceptions_app || ActionDispatch::PublicExceptions.new(Rails.public_path) middleware.use ::ActionDispatch::DebugExceptions middleware.use ::ActionDispatch::RemoteIp, config.action_dispatch.ip_spoofing_check, config.action_dispatch.trusted_proxies unless config.cache_classes app = self middleware.use ::ActionDispatch::Reloader, lambda { app.reload_dependencies? } end middleware.use ::ActionDispatch::Callbacks middleware.use ::ActionDispatch::Cookies if config.session_store if config.force_ssl && !config.session_options.key?(:secure) config.session_options[:secure] = true end middleware.use config.session_store, config.session_options middleware.use ::ActionDispatch::Flash end middleware.use ::ActionDispatch::ParamsParser middleware.use ::ActionDispatch::Head middleware.use ::Rack::ConditionalGet middleware.use ::Rack::ETag, "no-cache" if config.action_dispatch.best_standards_support middleware.use ::ActionDispatch::BestStandardsSupport, config.action_dispatch.best_standards_support end end end def initialize_tasks #:nodoc: self.class.rake_tasks do require "rails/tasks" task :environment do $rails_rake_task = true require_environment! end end end def initialize_console #:nodoc: require "pp" require "rails/console/app" require "rails/console/helpers" end def build_original_fullpath(env) path_info = env["PATH_INFO"] query_string = env["QUERY_STRING"] script_name = env["SCRIPT_NAME"] if query_string.present? "#{script_name}#{path_info}?#{query_string}" else "#{script_name}#{path_info}" end end end end