require 'logger' RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV) module Rails # The Initializer is responsible for processing the Rails configuration, such # as setting the $LOAD_PATH, requiring the right frameworks, initializing # logging, and more. It can be run either as a single command that'll just # use the default configuration, like this: # # Rails::Initializer.run # # But normally it's more interesting to pass in a custom configuration # through the block running: # # Rails::Initializer.run do |config| # config.frameworks -= [ :action_web_service ] # end # # This will use the default configuration options from Rails::Configuration, # but allow for overwriting on select areas. class Initializer # The Configuration instance used by this Initializer instance. attr_reader :configuration # Runs the initializer. By default, this will invoke the #process method, # which simply executes all of the initialization routines. Alternately, # you can specify explicitly which initialization routine you want: # # Rails::Initializer.run(:set_load_path) # # This is useful if you only want the load path initialized, without # incuring the overhead of completely loading the entire environment. def self.run(command = :process, configuration = Configuration.new) yield configuration if block_given? new(configuration).send(command) end # Create a new Initializer instance that references the given Configuration # instance. def initialize(configuration) @configuration = configuration end # Sequentially step through all of the available initialization routines, # in order: # # * #set_load_path # * #set_connection_adapters # * #require_frameworks # * #load_environment # * #initialize_database # * #initialize_logger # * #initialize_framework_logging # * #initialize_framework_views # * #initialize_routing # * #initialize_dependency_mechanism # * #initialize_breakpoints # * #initialize_whiny_nils # * #initialize_framework_settings # * #load_environment # * #load_plugins # # (Note that #load_environment is invoked twice, once at the start and # once at the end, to support the legacy configuration style where the # environment could overwrite the defaults directly, instead of via the # Configuration instance. def process set_load_path set_connection_adapters require_frameworks load_environment initialize_database initialize_logger initialize_framework_logging initialize_framework_views initialize_routing initialize_dependency_mechanism initialize_breakpoints initialize_whiny_nils initialize_framework_settings # Support for legacy configuration style where the environment # could overwrite anything set from the defaults/global through # the individual base class configurations. load_environment load_plugins end # Set the $LOAD_PATH based on the value of # Configuration#load_paths. Duplicates are removed. def set_load_path configuration.load_paths.reverse.each { |dir| $LOAD_PATH.unshift(dir) if File.directory?(dir) } $LOAD_PATH.uniq! end # Sets the +RAILS_CONNECTION_ADAPTERS+ constant based on the value of # Configuration#connection_adapters. This constant is used to determine # which database adapters should be loaded (by default, all adapters are # loaded). def set_connection_adapters Object.const_set("RAILS_CONNECTION_ADAPTERS", configuration.connection_adapters) if configuration.connection_adapters end # Requires all frameworks specified by the Configuration#frameworks # list. By default, all frameworks (ActiveRecord, ActiveSupport, # ActionPack, ActionMailer, and ActionWebService) are loaded. def require_frameworks configuration.frameworks.each { |framework| require(framework.to_s) } end # Loads all plugins in the vendor/plugins directory. Each # subdirectory of vendor/plugins is inspected as follows: # # * if the directory has a +lib+ subdirectory, add it to the load path # * if the directory contains an init.rb file, read it in and # eval it. # # After all plugins are loaded, duplicates are removed from the load path. def load_plugins config = configuration Dir.glob("#{configuration.plugins_path}/*") do |directory| next if File.basename(directory)[0] == ?. || !File.directory?(directory) if File.directory?("#{directory}/lib") $LOAD_PATH.unshift "#{directory}/lib" end if File.exist?("#{directory}/init.rb") silence_warnings do eval(IO.read("#{directory}/init.rb"), binding) end end end $LOAD_PATH.uniq! end # Loads the environment specified by Configuration#environment_path, which # is typically one of development, testing, or production. def load_environment silence_warnings do config = configuration constants = self.class.constants eval(IO.read(configuration.environment_path), binding) (self.class.constants - constants).each do |const| Object.const_set(const, self.class.const_get(const)) end end end # This initialization routine does nothing unless :active_record # 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. def initialize_database return unless configuration.frameworks.include?(:active_record) ActiveRecord::Base.configurations = configuration.database_configuration ActiveRecord::Base.establish_connection end # If the +RAILS_DEFAULT_LOGGER+ constant is already set, this initialization # routine does nothing. If the constant is not set, and Configuration#logger # is not +nil+, this also does nothing. Otherwise, a new logger instance # is created at Configuration#log_path, with a default log level of # Configuration#log_level. # # If the log could not be created, the log will be set to output to # +STDERR+, with a log level of +WARN+. def initialize_logger # if the environment has explicitly defined a logger, use it return if defined?(RAILS_DEFAULT_LOGGER) unless logger = configuration.logger begin logger = Logger.new(configuration.log_path) logger.level = Logger.const_get(configuration.log_level.to_s.upcase) rescue StandardError logger = Logger.new(STDERR) logger.level = Logger::WARN logger.warn( "Rails Error: Unable to access log file. Please ensure that #{configuration.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 silence_warnings { Object.const_set "RAILS_DEFAULT_LOGGER", logger } end # Sets the logger for ActiveRecord, ActionController, and ActionMailer # (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+. def initialize_framework_logging for framework in ([ :active_record, :action_controller, :action_mailer ] & configuration.frameworks) framework.to_s.camelize.constantize.const_get("Base").logger ||= RAILS_DEFAULT_LOGGER end end # Sets the +template_root+ for ActionController::Base and ActionMailer::Base # (but only for those frameworks that are to be loaded). If the framework's # +template_root+ has already been set, it is not changed, otherwise it is # set to use Configuration#view_path. def initialize_framework_views for framework in ([ :action_controller, :action_mailer ] & configuration.frameworks) framework.to_s.camelize.constantize.const_get("Base").template_root ||= configuration.view_path end end # If ActionController is not one of the loaded frameworks (Configuration#frameworks) # this does nothing. Otherwise, it loads the routing definitions and sets up # loading module used to lazily load controllers (Configuration#controller_paths). def initialize_routing return unless configuration.frameworks.include?(:action_controller) ActionController::Routing::Routes.reload Object.const_set "Controllers", Dependencies::LoadingModule.root(*configuration.controller_paths) end # Sets the dependency loading mechanism based on the value of # Configuration#cache_classes. def initialize_dependency_mechanism Dependencies.mechanism = configuration.cache_classes ? :require : :load end # Sets the +BREAKPOINT_SERVER_PORT+ if Configuration#breakpoint_server # is true. def initialize_breakpoints silence_warnings { Object.const_set("BREAKPOINT_SERVER_PORT", 42531) if configuration.breakpoint_server } end # Loads support for "whiny nil" (noisy warnings when methods are invoked # on +nil+ values) if Configuration#whiny_nils is true. def initialize_whiny_nils require('active_support/whiny_nil') if configuration.whiny_nils end # Initialize framework-specific settings for each of the loaded frameworks # (Configuration#frameworks). The available settings map to the accessors # on each of the corresponding Base classes. def initialize_framework_settings configuration.frameworks.each do |framework| base_class = framework.to_s.camelize.constantize.const_get("Base") configuration.send(framework).each do |setting, value| base_class.send("#{setting}=", value) end end end end # The Configuration class holds all the parameters for the Initializer and # ships with defaults that suites most Rails applications. But it's possible # to overwrite everything. Usually, you'll create an Configuration file # implicitly through the block running on the Initializer, but it's also # possible to create the Configuration instance in advance and pass it in # like this: # # config = Rails::Configuration.new # Rails::Initializer.run(:process, config) class Configuration # A stub for setting options on ActionController::Base attr_accessor :action_controller # A stub for setting options on ActionMailer::Base attr_accessor :action_mailer # A stub for setting options on ActionView::Base attr_accessor :action_view # A stub for setting options on ActionWebService::Base attr_accessor :action_web_service # A stub for setting options on ActiveRecord::Base attr_accessor :active_record # Whether or not to use the breakpoint server (boolean) attr_accessor :breakpoint_server # Whether or not classes should be cached (set to false if you want # application classes to be reloaded on each request) attr_accessor :cache_classes # The list of connection adapters to load. (By default, all connection # adapters are loaded. You can set this to be just the adapter(s) you # will use to reduce your application's load time.) attr_accessor :connection_adapters # The list of paths that should be searched for controllers. (Defaults # to app/controllers and components.) attr_accessor :controller_paths # The path to the database configuration file to use. (Defaults to # config/database.yml.) attr_accessor :database_configuration_file # The list of rails framework components that should be loaded. (Defaults # to :active_record, :action_controller, # :action_view, :action_mailer, and # :action_web_service). attr_accessor :frameworks # An array of additional paths to prepend to the load path. By default, # all +app+, +lib+, +vendor+ and mock paths are included in this list. attr_accessor :load_paths # The log level to use for the default Rails logger. In production mode, # this defaults to :info. In development mode, it defaults to # :debug. attr_accessor :log_level # The path to the log file to use. Defaults to log/#{environment}.log # (e.g. log/development.log or log/production.log). attr_accessor :log_path # The specific logger to use. By default, a logger will be created and # initialized using #log_path and #log_level, but a programmer may # specifically set the logger to use via this accessor and it will be # used directly. attr_accessor :logger # The root of the application's views. (Defaults to app/views.) attr_accessor :view_path # Set to +true+ if you want to be warned (noisily) when you try to invoke # any method of +nil+. Set to +false+ for the standard Ruby behavior. attr_accessor :whiny_nils # Create a new Configuration instance, initialized with the default # values. def initialize self.frameworks = default_frameworks self.load_paths = default_load_paths self.log_path = default_log_path self.log_level = default_log_level self.view_path = default_view_path self.controller_paths = default_controller_paths self.cache_classes = default_cache_classes self.breakpoint_server = default_breakpoint_server self.whiny_nils = default_whiny_nils self.database_configuration_file = default_database_configuration_file for framework in default_frameworks self.send("#{framework}=", OrderedOptions.new) end end # Loads and returns the contents of the #database_configuration_file. The # contents of the file are processed via ERB before being sent through # YAML::load. def database_configuration YAML::load(ERB.new(IO.read(database_configuration_file)).result) end # The path to the current environment's file (development.rb, etc.). By # default the file is at config/environments/#{environment}.rb. def environment_path "#{RAILS_ROOT}/config/environments/#{environment}.rb" end # The path to the root of the plugins directory. By default, it is in # vendor/plugins. def plugins_path "#{RAILS_ROOT}/vendor/plugins" end # Return the currently selected environment. By default, it returns the # value of the +RAILS_ENV+ constant. def environment ::RAILS_ENV end private def default_frameworks [ :active_record, :action_controller, :action_view, :action_mailer, :action_web_service ] end def default_load_paths paths = ["#{RAILS_ROOT}/test/mocks/#{environment}"] # Then model subdirectories. # TODO: Don't include .rb models as load paths paths.concat(Dir["#{RAILS_ROOT}/app/models/[_a-z]*"]) paths.concat(Dir["#{RAILS_ROOT}/components/[_a-z]*"]) # Followed by the standard includes. # TODO: Don't include dirs for frameworks that are not used paths.concat %w( app app/models app/controllers app/helpers app/services app/apis components config lib vendor vendor/rails/railties vendor/rails/railties/lib vendor/rails/actionpack/lib vendor/rails/activesupport/lib vendor/rails/activerecord/lib vendor/rails/actionmailer/lib vendor/rails/actionwebservice/lib ).map { |dir| "#{RAILS_ROOT}/#{dir}" }.select { |dir| File.directory?(dir) } end def default_log_path File.join(RAILS_ROOT, 'log', "#{environment}.log") end def default_log_level environment == 'production' ? :info : :debug end def default_database_configuration_file File.join(RAILS_ROOT, 'config', 'database.yml') end def default_view_path File.join(RAILS_ROOT, 'app', 'views') end def default_controller_paths [ File.join(RAILS_ROOT, 'app', 'controllers'), File.join(RAILS_ROOT, 'components') ] end def default_dependency_mechanism :load end def default_cache_classes false end def default_breakpoint_server false end def default_whiny_nils false end end end # Needs to be duplicated from Active Support since its needed before Active # Support is available. class OrderedOptions < Array # :nodoc: def []=(key, value) key = key.to_sym if pair = find_pair(key) pair.pop pair << value else self << [key, value] end end def [](key) pair = find_pair(key.to_sym) pair ? pair.last : nil end def method_missing(name, *args) if name.to_s =~ /(.*)=$/ self[$1.to_sym] = args.first else self[name] end end private def find_pair(key) self.each { |i| return i if i.first == key } return false end end