module Merb
class BootLoader
# def self.subclasses
#---
# @semipublic
cattr_accessor :subclasses, :after_load_callbacks, :before_load_callbacks
self.subclasses = []
self.after_load_callbacks = []
self.before_load_callbacks = []
class << self
# Adds the inheriting class to the list of subclasses in a position
# specified by the before and after methods.
#
# ==== Parameters
# klass<Class>:: The class inheriting from Merb::BootLoader.
def inherited(klass)
subclasses << klass.to_s
super
end
# ==== Parameters
# klass<~to_s>::
# The boot loader class after which this boot loader should be run.
#
#---
# @public
def after(klass)
move_klass(klass, 1)
end
# ==== Parameters
# klass<~to_s>::
# The boot loader class before which this boot loader should be run.
#
#---
# @public
def before(klass)
move_klass(klass, 0)
end
# Move a class that is inside the bootloader to some place in the Array,
# relative to another class.
#
# ==== Parameters
# klass<~to_s>::
# The klass to move the bootloader relative to
# where<Integer>::
# 0 means insert it before; 1 means insert it after
def move_klass(klass, where)
index = Merb::BootLoader.subclasses.index(klass.to_s)
if index
Merb::BootLoader.subclasses.delete(self.to_s)
Merb::BootLoader.subclasses.insert(index + where, self.to_s)
end
end
# Runs all boot loader classes by calling their run methods.
def run
subklasses = subclasses.dup
until subclasses.empty?
bootloader = subclasses.shift
Merb.logger.debug!("Loading: #{bootloader}") if ENV['DEBUG']
Object.full_const_get(bootloader).run
end
self.subclasses = subklasses
end
# Set up the default framework
#
# ==== Returns
# nil
#
#---
# @public
def default_framework
%w[view model controller helper mailer part].each do |component|
Merb.push_path(component.to_sym, Merb.root_path("app/#{component}s"))
end
Merb.push_path(:application, Merb.root_path("app/controllers/application.rb"))
Merb.push_path(:config, Merb.root_path("config"), nil)
Merb.push_path(:router, Merb.dir_for(:config), (Merb::Config[:router_file] || "router.rb"))
Merb.push_path(:lib, Merb.root_path("lib"), nil)
Merb.push_path(:log, Merb.log_path, nil)
Merb.push_path(:public, Merb.root_path("public"), nil)
Merb.push_path(:stylesheet, Merb.dir_for(:public) / "stylesheets", nil)
Merb.push_path(:javascript, Merb.dir_for(:public) / "javascripts", nil)
Merb.push_path(:image, Merb.dir_for(:public) / "images", nil)
nil
end
# ==== Parameters
# &block::
# A block to be added to the callbacks that will be executed after the
# app loads.
#
#---
# @public
def after_app_loads(&block)
after_load_callbacks << block
end
# ==== Parameters
# &block::
# A block to be added to the callbacks that will be executed before the
# app loads.
#
#---
# @public
def before_app_loads(&block)
before_load_callbacks << block
end
end
end
end
# Set up the logger.
#
# Place the logger inside of the Merb log directory (set up in
# Merb::BootLoader::BuildFramework)
class Merb::BootLoader::Logger < Merb::BootLoader
# Sets Merb.logger to a new logger created based on the config settings.
def self.run
Merb.logger = Merb::Logger.new(Merb.log_file, Merb::Config[:log_level], Merb::Config[:log_delimiter], Merb::Config[:log_auto_flush])
end
end
# Stores pid file.
#
# Only run if daemonization or clustering options specified on start.
# Port is taken from Merb::Config and must be already set at this point.
class Merb::BootLoader::DropPidFile < Merb::BootLoader
class << self
# Stores a PID file if Merb is running daemonized or clustered.
def run
Merb::Server.store_pid(Merb::Config[:port]) if Merb::Config[:daemonize] || Merb::Config[:cluster]
end
end
end
# Build the framework paths.
#
# By default, the following paths will be used:
# application:: Merb.root/app/controller/application.rb
# config:: Merb.root/config
# lib:: Merb.root/lib
# log:: Merb.root/log
# view:: Merb.root/app/views
# model:: Merb.root/app/models
# controller:: Merb.root/app/controllers
# helper:: Merb.root/app/helpers
# mailer:: Merb.root/app/mailers
# part:: Merb.root/app/parts
#
# To override the default, set Merb::Config[:framework] in your initialization
# file. Merb::Config[:framework] takes a Hash whose key is the name of the
# path, and whose values can be passed into Merb.push_path (see Merb.push_path
# for full details).
#
# ==== Notes
# All paths will default to Merb.root, so you can get a flat-file structure by
# doing Merb::Config[:framework] = {}.
#
# ==== Example
# Merb::Config[:framework] = {
# :view => Merb.root / "views"
# :model => Merb.root / "models"
# :lib => Merb.root / "lib"
# }
#
# That will set up a flat directory structure with the config files and
# controller files under Merb.root, but with models, views, and lib with their
# own folders off of Merb.root.
class Merb::BootLoader::BuildFramework < Merb::BootLoader
class << self
# Builds the framework directory structure.
def run
build_framework
end
# This method should be overridden in init.rb before Merb.start to set up
# a different framework structure.
def build_framework
if File.exists?(Merb.root / "config" / "framework.rb")
require Merb.root / "config" / "framework"
elsif File.exists?(Merb.root / "framework.rb")
require Merb.root / "framework"
else
Merb::BootLoader.default_framework
end
(Merb::Config[:framework] || {}).each do |name, path|
path = [path].flatten
Merb.push_path(name, Merb.root_path(path.first), path[1])
end
end
end
end
class Merb::BootLoader::Dependencies < Merb::BootLoader
cattr_accessor :dependencies
self.dependencies = []
# Load the init_file specified in Merb::Config or if not specified, the
# init.rb file from the Merb configuration directory, and any environment
# files, which register the list of necessary dependencies and any
# after_app_loads hooks.
#
# Dependencies can hook into the bootloader process itself by using
# before or after insertion methods. Since these are loaded from this
# bootloader (Dependencies), they can only adapt the bootloaders that
# haven't been loaded up until this point.
def self.run
load_initfile
load_env_config
enable_json_gem unless Merb::disabled?(:json)
load_dependencies
update_logger
end
def self.load_dependencies
dependencies.each { |name, ver| Kernel.load_dependency(name, *ver) }
end
def self.enable_json_gem
require "json/ext"
rescue LoadError
require "json/pure"
end
def self.update_logger
updated_logger_options = [ Merb.log_file, Merb::Config[:log_level], Merb::Config[:log_delimiter], Merb::Config[:log_auto_flush] ]
Merb::BootLoader::Logger.run if updated_logger_options != Merb.logger.init_args
end
private
# Determines the path for the environment configuration file
def self.env_config
Merb.dir_for(:config) / "environments" / (Merb.environment + ".rb")
end
# Checks to see whether or not an environment configuration exists
def self.env_config?
Merb.environment && File.exist?(env_config)
end
# Loads the environment configuration file, if any
def self.load_env_config
load(env_config) if env_config?
end
# Determines the init file to use, if any.
# By default Merb uses init.rb from application config directory.
def self.initfile
if Merb::Config[:init_file]
Merb::Config[:init_file].chomp(".rb") + ".rb"
else
Merb.dir_for(:config) / "init.rb"
end
end
# Loads the init file, should one exist
def self.load_initfile
load(initfile) if File.exists?(initfile)
end
end
class Merb::BootLoader::BeforeAppLoads < Merb::BootLoader
# Call any before_app_loads hooks that were registered via before_app_loads
# in any plugins.
def self.run
Merb::BootLoader.before_load_callbacks.each { |x| x.call }
end
end
# Load all classes inside the load paths.
#
# This is used in conjunction with Merb::BootLoader::ReloadClasses to track
# files that need to be reloaded, and which constants need to be removed in
# order to reload a file.
#
# This also adds the model, controller, and lib directories to the load path,
# so they can be required in order to avoid load-order issues.
class Merb::BootLoader::LoadClasses < Merb::BootLoader
LOADED_CLASSES = {}
MTIMES = {}
class << self
# Load all classes inside the load paths.
def run
orphaned_classes = []
# Add models, controllers, and lib to the load path
$LOAD_PATH.unshift Merb.dir_for(:model)
$LOAD_PATH.unshift Merb.dir_for(:controller)
$LOAD_PATH.unshift Merb.dir_for(:lib)
load_file Merb.dir_for(:application) if File.file?(Merb.dir_for(:application))
# Require all the files in the registered load paths
Merb.load_paths.each do |name, path|
next unless path.last && name != :application
Dir[path.first / path.last].each do |file|
begin
load_file file
rescue NameError => ne
orphaned_classes.unshift(file)
end
end
end
Merb::Controller.send :include, Merb::GlobalHelpers
load_classes_with_requirements(orphaned_classes)
end
# ==== Parameters
# file<String>:: The file to load.
def load_file(file)
klasses = ObjectSpace.classes.dup
load file
LOADED_CLASSES[file] = ObjectSpace.classes - klasses
MTIMES[file] = File.mtime(file)
end
# "Better loading" of classes. If a class fails to load due to a NameError
# it will be added to the failed_classs stack.
#
# ==== Parameters
# klasses<Array[Class]>:: Classes to load.
def load_classes_with_requirements(klasses)
klasses.uniq!
while klasses.size > 0
# Note size to make sure things are loading
size_at_start = klasses.size
# List of failed classes
failed_classes = []
# Map classes to exceptions
error_map = {}
klasses.each do |klass|
klasses.delete(klass)
begin
load_file klass
rescue NameError => ne
error_map[klass] = ne
failed_classes.push(klass)
end
end
# Keep list of classes unique
failed_classes.each { |k| klasses.push(k) unless klasses.include?(k) }
# Stop processing if nothing loads or if everything has loaded
if klasses.size == size_at_start && klasses.size != 0
# Write all remaining failed classes and their exceptions to the log
error_map.only(*failed_classes).each do |klass, e|
Merb.logger.fatal! "Could not load #{klass}:\n\n#{e.message} - (#{e.class})\n\n#{(e.backtrace || []).join("\n")}"
end
raise LoadError, "Could not load #{failed_classes.inspect} (see log for details)."
end
break if(klasses.size == size_at_start || klasses.size == 0)
end
end
# ==== Parameters
# file<String>:: The file to reload.
def reload(file)
Merb.klass_hashes.each {|x| x.protect_keys!}
if klasses = LOADED_CLASSES.delete(file)
klasses.each { |klass| remove_constant(klass) unless klass.to_s =~ /Router/ }
end
load_file file
Merb.klass_hashes.each {|x| x.unprotect_keys!}
end
# ==== Parameters
# const<Class>:: The class to remove.
def remove_constant(const)
# This is to support superclasses (like AbstractController) that track
# their subclasses in a class variable. Classes that wish to use this
# functionality are required to alias it to _subclasses_list. Plugins
# for ORMs and other libraries should keep this in mind.
superklass = const
until (superklass = superklass.superclass).nil?
if superklass.respond_to?(:_subclasses_list)
superklass.send(:_subclasses_list).delete(klass)
superklass.send(:_subclasses_list).delete(klass.to_s)
end
end
parts = const.to_s.split("::")
base = parts.size == 1 ? Object : Object.full_const_get(parts[0..-2].join("::"))
object = parts[-1].to_s
begin
base.send(:remove_const, object)
Merb.logger.debug("Removed constant #{object} from #{base}")
rescue NameError
Merb.logger.debug("Failed to remove constant #{object} from #{base}")
end
end
end
end
class Merb::BootLoader::Templates < Merb::BootLoader
class << self
# Loads the templates into the Merb::InlineTemplates module.
def run
template_paths.each do |path|
Merb::Template.inline_template(path)
end
end
# ==== Returns
# Array[String]:: Template files found.
def template_paths
extension_glob = "{#{Merb::Template::EXTENSIONS.keys.join(',')}}"
# This gets all templates set in the controllers template roots
# We separate the two maps because most of controllers will have
# the same _template_root, so it's silly to be globbing the same
# path over and over.
controller_view_paths = []
Merb::AbstractController._abstract_subclasses.each do |klass|
next if (const = Object.full_const_get(klass))._template_root.blank?
controller_view_paths += const._template_roots.map { |pair| pair.first }
end
template_paths = controller_view_paths.uniq.compact.map { |path| Dir["#{path}/**/*.#{extension_glob}"] }
# This gets the templates that might be created outside controllers
# template roots. eg app/views/shared/*
template_paths << Dir["#{Merb.dir_for(:view)}/**/*.#{extension_glob}"] if Merb.dir_for(:view)
template_paths.flatten.compact.uniq
end
end
end
# Register the default MIME types:
#
# By default, the mime-types include:
# :all:: no transform, */*
# :yaml:: to_yaml, application/x-yaml or text/yaml
# :text:: to_text, text/plain
# :html:: to_html, text/html or application/xhtml+xml or application/html
# :xml:: to_xml, application/xml or text/xml or application/x-xml
# :js:: to_json, text/javascript ot application/javascript or application/x-javascript
# :json:: to_json, application/json or text/x-json
class Merb::BootLoader::MimeTypes < Merb::BootLoader
# Registers the default MIME types.
def self.run
Merb.add_mime_type(:all, nil, %w[*/*])
Merb.add_mime_type(:yaml, :to_yaml, %w[application/x-yaml text/yaml], :charset => "utf-8")
Merb.add_mime_type(:text, :to_text, %w[text/plain], :charset => "utf-8")
Merb.add_mime_type(:html, :to_html, %w[text/html application/xhtml+xml application/html], :charset => "utf-8")
Merb.add_mime_type(:xml, :to_xml, %w[application/xml text/xml application/x-xml], :charset => "utf-8")
Merb.add_mime_type(:js, :to_json, %w[text/javascript application/javascript application/x-javascript], :charset => "utf-8")
Merb.add_mime_type(:json, :to_json, %w[application/json text/x-json], :charset => "utf-8")
end
end
class Merb::BootLoader::AfterAppLoads < Merb::BootLoader
# Call any after_app_loads hooks that were registered via after_app_loads in
# init.rb.
def self.run
Merb::BootLoader.after_load_callbacks.each {|x| x.call }
end
end
class Merb::BootLoader::MixinSessionContainer < Merb::BootLoader
# Mixin the correct session container.
def self.run
Merb.register_session_type('memory',
Merb.framework_root / "merb-core" / "dispatch" / "session" / "memory",
"Using in-memory sessions; sessions will be lost whenever the server stops.")
Merb.register_session_type('memcache',
Merb.framework_root / "merb-core" / "dispatch" / "session" / "memcached",
"Using 'memcached' sessions")
Merb.register_session_type('cookie', # Last session type becomes the default
Merb.framework_root / "merb-core" / "dispatch" / "session" / "cookie",
"Using 'share-nothing' cookie sessions (4kb limit per client)")
Merb::Controller.class_eval do
session_store = Merb::Config[:session_store].to_s
if ["", "false", "none"].include?(session_store)
Merb.logger.warn "Not Using Sessions"
elsif reg = Merb.registered_session_types[session_store]
if session_store == "cookie"
Merb::BootLoader::MixinSessionContainer.check_for_secret_key
Merb::BootLoader::MixinSessionContainer.check_for_session_id_key
end
require reg[:file]
include ::Merb::SessionMixin
Merb.logger.warn reg[:description]
else
Merb.logger.warn "Session store not found, '#{Merb::Config[:session_store]}'."
Merb.logger.warn "Defaulting to CookieStore Sessions"
Merb::BootLoader::MixinSessionContainer.check_for_secret_key
Merb::BootLoader::MixinSessionContainer.check_for_session_id_key
require Merb.registered_session_types
) is private.
