path: root/railties/lib/rails/application.rb

module Rails
  class Application
    extend Initializable

    class << self
      def config
        @config ||= Configuration.new
      end

      # TODO: change the plugin loader to use config
      alias configuration config

      def config=(config)
        @config = config
      end

      def plugin_loader
        @plugin_loader ||= config.plugin_loader.new(self)
      end

      def routes
        ActionController::Routing::Routes
      end

      def middleware
        config.middleware
      end

      def call(env)
        @app ||= middleware.build(routes)
        @app.call(env)
      end

      def new
        initializers.run
        self
      end
    end

    initializer :initialize_rails do
      Rails.initializers.run
    end

    # Set the <tt>$LOAD_PATH</tt> based on the value of
    # Configuration#load_paths. Duplicates are removed.
    initializer :set_load_path do
      config.paths.add_to_load_path
      $LOAD_PATH.uniq!
    end

    # Bail if boot.rb is outdated
    initializer :freak_out_if_boot_rb_is_outdated do
      unless defined?(Rails::BOOTSTRAP_VERSION)
        abort %{Your config/boot.rb is outdated: Run "rake rails:update".}
      end
    end

    # Requires all frameworks specified by the Configuration#frameworks
    # list. By default, all frameworks (Active Record, Active Support,
    # Action Pack, Action Mailer, and Active Resource) are loaded.
    initializer :require_frameworks do
      begin
        require 'active_support'
        require 'active_support/core_ext/kernel/reporting'
        require 'active_support/core_ext/logger'

        # TODO: This is here to make Sam Ruby's tests pass. Needs discussion.
        require 'active_support/core_ext/numeric/bytes'
        config.frameworks.each { |framework| require(framework.to_s) }
      rescue LoadError => e
        # Re-raise as RuntimeError because Mongrel would swallow LoadError.
        raise e.to_s
      end
    end

    # Set the paths from which Rails will automatically load source files, and
    # the load_once paths.
    initializer :set_autoload_paths do
      require 'active_support/dependencies'
      ActiveSupport::Dependencies.load_paths = config.load_paths.uniq
      ActiveSupport::Dependencies.load_once_paths = config.load_once_paths.uniq

      extra = ActiveSupport::Dependencies.load_once_paths - ActiveSupport::Dependencies.load_paths
      unless extra.empty?
        abort <<-end_error
          load_once_paths must be a subset of the load_paths.
          Extra items in load_once_paths: #{extra * ','}
        end_error
      end

      # Freeze the arrays so future modifications will fail rather than do nothing mysteriously
      config.load_once_paths.freeze
    end

    # Adds all load paths from plugins to the global set of load paths, so that
    # code from plugins can be required (explicitly or automatically via ActiveSupport::Dependencies).
    initializer :add_plugin_load_paths do
      require 'active_support/dependencies'
      plugin_loader.add_plugin_load_paths
    end

    # Create tmp directories
    initializer :ensure_tmp_directories_exist do
      %w(cache pids sessions sockets).each do |dir_to_make|
        FileUtils.mkdir_p(File.join(config.root_path, 'tmp', dir_to_make))
      end
    end

    # Loads the environment specified by Configuration#environment_path, which
    # is typically one of development, test, or production.
    initializer :load_environment do
      silence_warnings do
        next if @environment_loaded
        next unless File.file?(config.environment_path)

        @environment_loaded = true
        constants = self.class.constants

        eval(IO.read(config.environment_path), binding, config.environment_path)

        (self.class.constants - constants).each do |const|
          Object.const_set(const, self.class.const_get(const))
        end
      end
    end

    initializer :add_gem_load_paths do
      require 'rails/gem_dependency'
      Rails::GemDependency.add_frozen_gem_path
      unless config.gems.empty?
        require "rubygems"
        config.gems.each { |gem| gem.add_load_paths }
      end
    end

    # Preload all frameworks specified by the Configuration#frameworks.
    # Used by Passenger to ensure everything's loaded before forking and
    # to avoid autoload race conditions in JRuby.
    initializer :preload_frameworks do
      if config.preload_frameworks
        config.frameworks.each do |framework|
          # String#classify and #constantize aren't available yet.
          toplevel = Object.const_get(framework.to_s.gsub(/(?:^|_)(.)/) { $1.upcase })
          toplevel.load_all! if toplevel.respond_to?(:load_all!)
        end
      end
    end

    # This initialization routine does nothing unless <tt>:active_record</tt>
    # is one of the frameworks to load (Configuration#frameworks). If it is,
    # this sets the database configuration from Configuration#database_configuration
    # and then establishes the connection.
    initializer :initialize_database do
      if config.frameworks.include?(:active_record)
        ActiveRecord::Base.configurations = config.database_configuration
        ActiveRecord::Base.establish_connection
      end
    end

    # Include middleware to serve up static assets
    initializer :initialize_static_server do
      if config.frameworks.include?(:action_controller) && config.serve_static_assets
        config.middleware.use(ActionDispatch::Static, Rails.public_path)
      end
    end

    initializer :initialize_middleware_stack do
      if config.frameworks.include?(:action_controller)
        config.middleware.use(::Rack::Lock) unless ActionController::Base.allow_concurrency
        config.middleware.use(ActionDispatch::ShowExceptions, ActionController::Base.consider_all_requests_local)
        config.middleware.use(ActionDispatch::Callbacks, ActionController::Dispatcher.prepare_each_request)
        config.middleware.use(lambda { ActionController::Base.session_store }, lambda { ActionController::Base.session_options })
        config.middleware.use(ActionDispatch::ParamsParser)
        config.middleware.use(::Rack::MethodOverride)
        config.middleware.use(::Rack::Head)
        config.middleware.use(ActionDispatch::StringCoercion)
      end
    end

    initializer :initialize_cache do
      unless defined?(RAILS_CACHE)
        silence_warnings { Object.const_set "RAILS_CACHE", ActiveSupport::Cache.lookup_store(config.cache_store) }

        if RAILS_CACHE.respond_to?(:middleware)
          # Insert middleware to setup and teardown local cache for each request
          config.middleware.insert_after(:"Rack::Lock", RAILS_CACHE.middleware)
        end
      end
    end

    initializer :initialize_framework_caches do
      if config.frameworks.include?(:action_controller)
        ActionController::Base.cache_store ||= RAILS_CACHE
      end
    end

    initializer :initialize_logger do
      # if the environment has explicitly defined a logger, use it
      next if Rails.logger

      unless logger = config.logger
        begin
          logger = ActiveSupport::BufferedLogger.new(config.log_path)
          logger.level = ActiveSupport::BufferedLogger.const_get(config.log_level.to_s.upcase)
          if RAILS_ENV == "production"
            logger.auto_flushing = false
          end
        rescue StandardError => e
          logger = ActiveSupport::BufferedLogger.new(STDERR)
          logger.level = ActiveSupport::BufferedLogger::WARN
          logger.warn(
            "Rails Error: Unable to access log file. Please ensure that #{config.log_path} exists and is chmod 0666. " +
            "The log level has been raised to WARN and the output directed to STDERR until the problem is fixed."
          )
        end
      end

      # TODO: Why are we silencing warning here?
      silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger }
    end

    # Sets the logger for Active Record, Action Controller, and Action Mailer
    # (but only for those frameworks that are to be loaded). If the framework's
    # logger is already set, it is not changed, otherwise it is set to use
    # RAILS_DEFAULT_LOGGER.
    initializer :initialize_framework_logging do
      for framework in ([ :active_record, :action_controller, :action_mailer ] & config.frameworks)
        framework.to_s.camelize.constantize.const_get("Base").logger ||= Rails.logger
      end

      ActiveSupport::Dependencies.logger ||= Rails.logger
      Rails.cache.logger ||= Rails.logger
    end

    # Sets the dependency loading mechanism based on the value of
    # Configuration#cache_classes.
    initializer :initialize_dependency_mechanism do
      # TODO: Remove files from the $" and always use require
      ActiveSupport::Dependencies.mechanism = config.cache_classes ? :require : :load
    end

    # Loads support for "whiny nil" (noisy warnings when methods are invoked
    # on +nil+ values) if Configuration#whiny_nils is true.
    initializer :initialize_whiny_nils do
      require('active_support/whiny_nil') if config.whiny_nils
    end

    # Sets the default value for Time.zone, and turns on ActiveRecord::Base#time_zone_aware_attributes.
    # If assigned value cannot be matched to a TimeZone, an exception will be raised.
    initializer :initialize_time_zone do
      if config.time_zone
        zone_default = Time.__send__(:get_zone, config.time_zone)

        unless zone_default
          raise \
            'Value assigned to config.time_zone not recognized.' +
            'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
        end

        Time.zone_default = zone_default

        if config.frameworks.include?(:active_record)
          ActiveRecord::Base.time_zone_aware_attributes = true
          ActiveRecord::Base.default_timezone = :utc
        end
      end
    end

    # Set the i18n configuration from config.i18n but special-case for the load_path which should be
    # appended to what's already set instead of overwritten.
    initializer :initialize_i18n do
      config.i18n.each do |setting, value|
        if setting == :load_path
          I18n.load_path += value
        else
          I18n.send("#{setting}=", value)
        end
      end
    end
  end
end