File: initializer.rb

package info (click to toggle)
rails 2.3.5-1.2+squeeze8
  • links: PTS, VCS
  • area: main
  • in suites: squeeze
  • size: 18,248 kB
  • ctags: 20,944
  • sloc: ruby: 122,413; makefile: 72; sql: 43; sh: 1
file content (1128 lines) | stat: -rw-r--r-- 39,586 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
require 'logger'
require 'set'
require 'pathname'

$LOAD_PATH.unshift File.dirname(__FILE__)
require 'railties_path'
require 'rails/version'
require 'rails/plugin/locator'
require 'rails/plugin/loader'
require 'rails/gem_dependency'
require 'rails/rack'


RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV)

module Rails
  class << self
    # The Configuration instance used to configure the Rails environment
    def configuration
      @@configuration
    end

    def configuration=(configuration)
      @@configuration = configuration
    end

    def initialized?
      @initialized || false
    end

    def initialized=(initialized)
      @initialized ||= initialized
    end

    def logger
      if defined?(RAILS_DEFAULT_LOGGER)
        RAILS_DEFAULT_LOGGER
      else
        nil
      end
    end

    def backtrace_cleaner
      @@backtrace_cleaner ||= begin
        # Relies on ActiveSupport, so we have to lazy load to postpone definition until AS has been loaded
        require 'rails/backtrace_cleaner'
        Rails::BacktraceCleaner.new
      end
    end

    def root
      Pathname.new(RAILS_ROOT) if defined?(RAILS_ROOT)
    end

    def env
      @_env ||= ActiveSupport::StringInquirer.new(RAILS_ENV)
    end

    def cache
      RAILS_CACHE
    end

    def version
      VERSION::STRING
    end

    def public_path
      @@public_path ||= self.root ? File.join(self.root, "public") : "public"
    end

    def public_path=(path)
      @@public_path = path
    end
  end

  # 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_mailer ]
  #   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

    # The set of loaded plugins.
    attr_reader :loaded_plugins

    # Whether or not all the gem dependencies have been met
    attr_reader :gems_dependencies_loaded

    # 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
    # incurring the overhead of completely loading the entire environment.
    def self.run(command = :process, configuration = Configuration.new)
      yield configuration if block_given?
      initializer = new configuration
      initializer.send(command)
      initializer
    end

    # Create a new Initializer instance that references the given Configuration
    # instance.
    def initialize(configuration)
      @configuration = configuration
      @loaded_plugins = []
    end

    # Sequentially step through all of the available initialization routines,
    # in order (view execution order in source).
    def process
      Rails.configuration = configuration

      check_ruby_version
      install_gem_spec_stubs
      set_load_path
      add_gem_load_paths

      require_frameworks
      set_autoload_paths
      add_plugin_load_paths
      load_environment
      preload_frameworks

      initialize_encoding
      initialize_database

      initialize_cache
      initialize_framework_caches

      initialize_logger
      initialize_framework_logging

      initialize_dependency_mechanism
      initialize_whiny_nils

      initialize_time_zone
      initialize_i18n

      initialize_framework_settings
      initialize_framework_views

      initialize_metal

      add_support_load_paths

      check_for_unbuilt_gems

      load_gems
      load_plugins

      # pick up any gems that plugins depend on
      add_gem_load_paths
      load_gems
      check_gem_dependencies

      # bail out if gems are missing - note that check_gem_dependencies will have
      # already called abort() unless $gems_rake_task is set
      return unless gems_dependencies_loaded

      load_application_initializers

      # the framework is now fully initialized
      after_initialize

      # Setup database middleware after initializers have run
      initialize_database_middleware

      # Prepare dispatcher callbacks and run 'prepare' callbacks
      prepare_dispatcher

      # Routing must be initialized after plugins to allow the former to extend the routes
      initialize_routing

      # Observers are loaded after plugins in case Observers or observed models are modified by plugins.
      load_observers

      # Load view path cache
      load_view_paths

      # Load application classes
      load_application_classes

      # Disable dependency loading during request cycle
      disable_dependency_loading

      # Flag initialized
      Rails.initialized = true
    end

    # Check for valid Ruby version
    # This is done in an external file, so we can use it
    # from the `rails` program as well without duplication.
    def check_ruby_version
      require 'ruby_version_check'
    end

    # If Rails is vendored and RubyGems is available, install stub GemSpecs
    # for Rails, Active Support, Active Record, Action Pack, Action Mailer, and
    # Active Resource. This allows Gem plugins to depend on Rails even when
    # the Gem version of Rails shouldn't be loaded.
    def install_gem_spec_stubs
      unless Rails.respond_to?(:vendor_rails?)
        abort %{Your config/boot.rb is outdated: Run "rake rails:update".}
      end

      if Rails.vendor_rails?
        begin; require "rubygems"; rescue LoadError; return; end

        stubs = %w(rails activesupport activerecord actionpack actionmailer activeresource)
        stubs.reject! { |s| Gem.loaded_specs.key?(s) }

        stubs.each do |stub|
          Gem.loaded_specs[stub] = Gem::Specification.new do |s|
            s.name = stub
            s.version = Rails::VERSION::STRING
            s.loaded_from = ""
          end
        end
      end
    end

    # Set the <tt>$LOAD_PATH</tt> based on the value of
    # Configuration#load_paths. Duplicates are removed.
    def set_load_path
      load_paths = configuration.load_paths + configuration.framework_paths
      load_paths.reverse_each { |dir| $LOAD_PATH.unshift(dir) if File.directory?(dir) }
      $LOAD_PATH.uniq!
    end

    # Set the paths from which Rails will automatically load source files, and
    # the load_once paths.
    def set_autoload_paths
      ActiveSupport::Dependencies.load_paths = configuration.load_paths.uniq
      ActiveSupport::Dependencies.load_once_paths = configuration.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
      configuration.load_once_paths.freeze
    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.
    def require_frameworks
      configuration.frameworks.each { |framework| require(framework.to_s) }
    rescue LoadError => e
      # Re-raise as RuntimeError because Mongrel would swallow LoadError.
      raise e.to_s
    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.
    def preload_frameworks
      if configuration.preload_frameworks
        configuration.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

    # Add the load paths used by support functions such as the info controller
    def add_support_load_paths
    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).
    def add_plugin_load_paths
      plugin_loader.add_plugin_load_paths
    end

    def add_gem_load_paths
      Rails::GemDependency.add_frozen_gem_path
      unless @configuration.gems.empty?
        require "rubygems"
        @configuration.gems.each { |gem| gem.add_load_paths }
      end
    end

    def load_gems
      unless $gems_rake_task
        @configuration.gems.each { |gem| gem.load }
      end
    end

    def check_for_unbuilt_gems
      unbuilt_gems = @configuration.gems.select(&:frozen?).reject(&:built?)
      if unbuilt_gems.size > 0
        # don't print if the gems:build rake tasks are being run
        unless $gems_build_rake_task
          abort <<-end_error
The following gems have native components that need to be built
  #{unbuilt_gems.map { |gem| "#{gem.name}  #{gem.requirement}" } * "\n  "}

You're running:
  ruby #{Gem.ruby_version} at #{Gem.ruby}
  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}

Run `rake gems:build` to build the unbuilt gems.
          end_error
        end
      end
    end

    def check_gem_dependencies
      unloaded_gems = @configuration.gems.reject { |g| g.loaded? }
      if unloaded_gems.size > 0
        @gems_dependencies_loaded = false
        # don't print if the gems rake tasks are being run
        unless $gems_rake_task
          abort <<-end_error
Missing these required gems:
  #{unloaded_gems.map { |gem| "#{gem.name}  #{gem.requirement}" } * "\n  "}

You're running:
  ruby #{Gem.ruby_version} at #{Gem.ruby}
  rubygems #{Gem::RubyGemsVersion} at #{Gem.path * ', '}

Run `rake gems:install` to install the missing gems.
          end_error
        end
      else
        @gems_dependencies_loaded = true
      end
    end

    # Loads all plugins in <tt>config.plugin_paths</tt>.  <tt>plugin_paths</tt>
    # defaults to <tt>vendor/plugins</tt> but may also be set to a list of
    # paths, such as
    #   config.plugin_paths = ["#{RAILS_ROOT}/lib/plugins", "#{RAILS_ROOT}/vendor/plugins"]
    #
    # In the default implementation, as each plugin discovered in <tt>plugin_paths</tt> is initialized:
    # * its +lib+ directory, if present, is added to the load path (immediately after the applications lib directory)
    # * <tt>init.rb</tt> is evaluated, if present
    #
    # After all plugins are loaded, duplicates are removed from the load path.
    # If an array of plugin names is specified in config.plugins, only those plugins will be loaded
    # and they plugins will be loaded in that order. Otherwise, plugins are loaded in alphabetical
    # order.
    #
    # if config.plugins ends contains :all then the named plugins will be loaded in the given order and all other
    # plugins will be loaded in alphabetical order
    def load_plugins
      plugin_loader.load_plugins
    end

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

    # Loads the environment specified by Configuration#environment_path, which
    # is typically one of development, test, or production.
    def load_environment
      silence_warnings do
        return if @environment_loaded
        @environment_loaded = true

        config = configuration
        constants = self.class.constants

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

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

    def load_observers
      if gems_dependencies_loaded && configuration.frameworks.include?(:active_record)
        ActiveRecord::Base.instantiate_observers
      end
    end

    def load_view_paths
      if configuration.frameworks.include?(:action_view)
        ActionController::Base.view_paths.load! if configuration.frameworks.include?(:action_controller)
        ActionMailer::Base.view_paths.load! if configuration.frameworks.include?(:action_mailer)
      end
    end

    # Eager load application classes
    def load_application_classes
      return if $rails_rake_task
      if configuration.cache_classes
        configuration.eager_load_paths.each do |load_path|
          matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/
          Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
            require_dependency file.sub(matcher, '\1')
          end
        end
      end
    end

    # For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
    # multibyte safe operations. Plugin authors supporting other encodings
    # should override this behaviour and set the relevant +default_charset+
    # on ActionController::Base.
    #
    # For Ruby 1.9, this does nothing. Specify the default encoding in the Ruby
    # shebang line if you don't want UTF-8.
    def initialize_encoding
      $KCODE='u' if RUBY_VERSION < '1.9'
    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.
    def initialize_database
      if configuration.frameworks.include?(:active_record)
        ActiveRecord::Base.configurations = configuration.database_configuration
        ActiveRecord::Base.establish_connection
      end
    end

    def initialize_database_middleware
      if configuration.frameworks.include?(:active_record)
        if configuration.frameworks.include?(:action_controller) &&
            ActionController::Base.session_store.name == 'ActiveRecord::SessionStore'
          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::ConnectionAdapters::ConnectionManagement
          configuration.middleware.insert_before :"ActiveRecord::SessionStore", ActiveRecord::QueryCache
        else
          configuration.middleware.use ActiveRecord::ConnectionAdapters::ConnectionManagement
          configuration.middleware.use ActiveRecord::QueryCache
        end
      end
    end

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

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

    def initialize_framework_caches
      if configuration.frameworks.include?(:action_controller)
        ActionController::Base.cache_store ||= RAILS_CACHE
      end
    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 Rails.logger

      unless logger = configuration.logger
        begin
          logger = ActiveSupport::BufferedLogger.new(configuration.log_path)
          logger.level = ActiveSupport::BufferedLogger.const_get(configuration.log_level.to_s.upcase)
          if configuration.environment == "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 #{configuration.log_path} exists and is write-accessible to UID #{Process.euid}, GID #{Process.egid}. " +
            "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 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.
    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.logger
      end

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

    # Sets +ActionController::Base#view_paths+ and +ActionMailer::Base#template_root+
    # (but only for those frameworks that are to be loaded). If the framework's
    # paths have already been set, it is not changed, otherwise it is
    # set to use Configuration#view_path.
    def initialize_framework_views
      if configuration.frameworks.include?(:action_view)
        view_path = ActionView::PathSet.type_cast(configuration.view_path)
        ActionMailer::Base.template_root  = view_path if configuration.frameworks.include?(:action_mailer) && ActionMailer::Base.view_paths.blank?
        ActionController::Base.view_paths = view_path if configuration.frameworks.include?(:action_controller) && ActionController::Base.view_paths.blank?
      end
    end

    # If Action Controller 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.controller_paths += configuration.controller_paths
      ActionController::Routing::Routes.add_configuration_file(configuration.routes_configuration_file)
      ActionController::Routing::Routes.reload!
    end

    # Sets the dependency loading mechanism based on the value of
    # Configuration#cache_classes.
    def initialize_dependency_mechanism
      ActiveSupport::Dependencies.mechanism = configuration.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.
    def initialize_whiny_nils
      require('active_support/whiny_nil') if configuration.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.
    def initialize_time_zone
      if configuration.time_zone
        zone_default = Time.__send__(:get_zone, configuration.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 configuration.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.
    def initialize_i18n
      configuration.i18n.each do |setting, value|
        if setting == :load_path
          I18n.load_path += value
        else
          I18n.send("#{setting}=", value)
        end
      end
    end

    def initialize_metal
      Rails::Rack::Metal.requested_metals = configuration.metals
      Rails::Rack::Metal.metal_paths += plugin_loader.engine_metal_paths

      configuration.middleware.insert_before(
        :"ActionController::ParamsParser",
        Rails::Rack::Metal, :if => Rails::Rack::Metal.metals.any?)
    end

    # Initializes 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
      configuration.active_support.each do |setting, value|
        ActiveSupport.send("#{setting}=", value)
      end
    end

    # Fires the user-supplied after_initialize block (Configuration#after_initialize)
    def after_initialize
      if gems_dependencies_loaded
        configuration.after_initialize_blocks.each do |block|
          block.call
        end
      end
    end

    def load_application_initializers
      if gems_dependencies_loaded
        Dir["#{configuration.root_path}/config/initializers/**/*.rb"].sort.each do |initializer|
          load(initializer)
        end
      end
    end

    def prepare_dispatcher
      return unless configuration.frameworks.include?(:action_controller)
      require 'dispatcher' unless defined?(::Dispatcher)
      Dispatcher.define_dispatcher_callbacks(configuration.cache_classes)
      Dispatcher.run_prepare_callbacks
    end

    def disable_dependency_loading
      if configuration.cache_classes && !configuration.dependency_loading
        ActiveSupport::Dependencies.unhook!
      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
    # The application's base directory.
    attr_reader :root_path

    # 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 ActiveRecord::Base.
    attr_accessor :active_record

    # A stub for setting options on ActiveResource::Base.
    attr_accessor :active_resource

    # A stub for setting options on ActiveSupport.
    attr_accessor :active_support

    # Whether to preload all frameworks at startup.
    attr_accessor :preload_frameworks

    # 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 paths that should be searched for controllers. (Defaults
    # to <tt>app/controllers</tt>.)
    attr_accessor :controller_paths

    # The path to the database configuration file to use. (Defaults to
    # <tt>config/database.yml</tt>.)
    attr_accessor :database_configuration_file

    # The path to the routes configuration file to use. (Defaults to
    # <tt>config/routes.rb</tt>.)
    attr_accessor :routes_configuration_file

    # The list of rails framework components that should be loaded. (Defaults
    # to <tt>:active_record</tt>, <tt>:action_controller</tt>,
    # <tt>:action_view</tt>, <tt>:action_mailer</tt>, and
    # <tt>:active_resource</tt>).
    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

    # An array of paths from which Rails will automatically load from only once.
    # All elements of this array must also be in +load_paths+.
    attr_accessor :load_once_paths

    # An array of paths from which Rails will eager load on boot if cache
    # classes is enabled. All elements of this array must also be in
    # +load_paths+.
    attr_accessor :eager_load_paths

    # The log level to use for the default Rails logger. In production mode,
    # this defaults to <tt>:info</tt>. In development mode, it defaults to
    # <tt>:debug</tt>.
    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 specific cache store to use. By default, the ActiveSupport::Cache::Store will be used.
    attr_accessor :cache_store

    # The root of the application's views. (Defaults to <tt>app/views</tt>.)
    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

    # The list of plugins to load. If this is set to <tt>nil</tt>, all plugins will
    # be loaded. If this is set to <tt>[]</tt>, no plugins will be loaded. Otherwise,
    # plugins will be loaded in the order specified.
    attr_reader :plugins
    def plugins=(plugins)
      @plugins = plugins.nil? ? nil : plugins.map { |p| p.to_sym }
    end

    # The list of metals to load. If this is set to <tt>nil</tt>, all metals will
    # be loaded in alphabetical order. If this is set to <tt>[]</tt>, no metals will
    # be loaded. Otherwise metals will be loaded in the order specified
    attr_accessor :metals

    # The path to the root of the plugins directory. By default, it is in
    # <tt>vendor/plugins</tt>.
    attr_accessor :plugin_paths

    # The classes that handle finding the desired plugins that you'd like to load for
    # your application. By default it is the Rails::Plugin::FileSystemLocator which finds
    # plugins to load in <tt>vendor/plugins</tt>. You can hook into gem location by subclassing
    # Rails::Plugin::Locator and adding it onto the list of <tt>plugin_locators</tt>.
    attr_accessor :plugin_locators

    # The class that handles loading each plugin. Defaults to Rails::Plugin::Loader, but
    # a sub class would have access to fine grained modification of the loading behavior. See
    # the implementation of Rails::Plugin::Loader for more details.
    attr_accessor :plugin_loader

    # Enables or disables plugin reloading.  You can get around this setting per plugin.
    # If <tt>reload_plugins?</tt> is false, add this to your plugin's <tt>init.rb</tt>
    # to make it reloadable:
    #
    #   ActiveSupport::Dependencies.load_once_paths.delete lib_path
    #
    # If <tt>reload_plugins?</tt> is true, add this to your plugin's <tt>init.rb</tt>
    # to only load it once:
    #
    #   ActiveSupport::Dependencies.load_once_paths << lib_path
    #
    attr_accessor :reload_plugins

    # Returns true if plugin reloading is enabled.
    def reload_plugins?
      !!@reload_plugins
    end

    # Enables or disables dependency loading during the request cycle. Setting
    # <tt>dependency_loading</tt> to true will allow new classes to be loaded
    # during a request. Setting it to false will disable this behavior.
    #
    # Those who want to run in a threaded environment should disable this
    # option and eager load or require all there classes on initialization.
    #
    # If <tt>cache_classes</tt> is disabled, dependency loaded will always be
    # on.
    attr_accessor :dependency_loading

    # An array of gems that this rails application depends on.  Rails will automatically load
    # these gems during installation, and allow you to install any missing gems with:
    #
    #   rake gems:install
    #
    # You can add gems with the #gem method.
    attr_accessor :gems

    # Adds a single Gem dependency to the rails application. By default, it will require
    # the library with the same name as the gem. Use :lib to specify a different name.
    #
    #   # gem 'aws-s3', '>= 0.4.0'
    #   # require 'aws/s3'
    #   config.gem 'aws-s3', :lib => 'aws/s3', :version => '>= 0.4.0', \
    #     :source => "http://code.whytheluckystiff.net"
    #
    # To require a library be installed, but not attempt to load it, pass :lib => false
    #
    #   config.gem 'qrp', :version => '0.4.1', :lib => false
    def gem(name, options = {})
      @gems << Rails::GemDependency.new(name, options)
    end

    # Deprecated options:
    def breakpoint_server(_ = nil)
      $stderr.puts %(
      *******************************************************************
      * config.breakpoint_server has been deprecated and has no effect. *
      *******************************************************************
      )
    end
    alias_method :breakpoint_server=, :breakpoint_server

    # Sets the default +time_zone+.  Setting this will enable +time_zone+
    # awareness for Active Record models and set the Active Record default
    # timezone to <tt>:utc</tt>.
    attr_accessor :time_zone

    # Accessor for i18n settings.
    attr_accessor :i18n

    # Create a new Configuration instance, initialized with the default
    # values.
    def initialize
      set_root_path!

      self.frameworks                   = default_frameworks
      self.load_paths                   = default_load_paths
      self.load_once_paths              = default_load_once_paths
      self.eager_load_paths             = default_eager_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.preload_frameworks           = default_preload_frameworks
      self.cache_classes                = default_cache_classes
      self.dependency_loading           = default_dependency_loading
      self.whiny_nils                   = default_whiny_nils
      self.plugins                      = default_plugins
      self.plugin_paths                 = default_plugin_paths
      self.plugin_locators              = default_plugin_locators
      self.plugin_loader                = default_plugin_loader
      self.database_configuration_file  = default_database_configuration_file
      self.routes_configuration_file    = default_routes_configuration_file
      self.gems                         = default_gems
      self.i18n                         = default_i18n

      for framework in default_frameworks
        self.send("#{framework}=", Rails::OrderedOptions.new)
      end
      self.active_support = Rails::OrderedOptions.new
    end

    # Set the root_path to RAILS_ROOT and canonicalize it.
    def set_root_path!
      raise 'RAILS_ROOT is not set' unless defined?(::RAILS_ROOT)
      raise 'RAILS_ROOT is not a directory' unless File.directory?(::RAILS_ROOT)

      @root_path =
        # Pathname is incompatible with Windows, but Windows doesn't have
        # real symlinks so File.expand_path is safe.
        if RUBY_PLATFORM =~ /(:?mswin|mingw)/
          File.expand_path(::RAILS_ROOT)

        # Otherwise use Pathname#realpath which respects symlinks.
        else
          Pathname.new(::RAILS_ROOT).realpath.to_s
        end

      Object.const_set(:RELATIVE_RAILS_ROOT, ::RAILS_ROOT.dup) unless defined?(::RELATIVE_RAILS_ROOT)
      ::RAILS_ROOT.replace @root_path
    end

    # Enable threaded mode. Allows concurrent requests to controller actions and
    # multiple database connections. Also disables automatic dependency loading
    # after boot, and disables reloading code on every request, as these are
    # fundamentally incompatible with thread safety.
    def threadsafe!
      self.preload_frameworks = true
      self.cache_classes = true
      self.dependency_loading = false
      self.action_controller.allow_concurrency = true
      self
    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
      require 'erb'
      YAML::load(ERB.new(IO.read(database_configuration_file)).result)
    end

    # The path to the current environment's file (<tt>development.rb</tt>, etc.). By
    # default the file is at <tt>config/environments/#{environment}.rb</tt>.
    def environment_path
      "#{root_path}/config/environments/#{environment}.rb"
    end

    # Return the currently selected environment. By default, it returns the
    # value of the RAILS_ENV constant.
    def environment
      ::RAILS_ENV
    end

    # Adds a block which will be executed after rails has been fully initialized.
    # Useful for per-environment configuration which depends on the framework being
    # fully initialized.
    def after_initialize(&after_initialize_block)
      after_initialize_blocks << after_initialize_block if after_initialize_block
    end

    # Returns the blocks added with Configuration#after_initialize
    def after_initialize_blocks
      @after_initialize_blocks ||= []
    end

    # Add a preparation callback that will run before every request in development
    # mode, or before the first request in production.
    #
    # See Dispatcher#to_prepare.
    def to_prepare(&callback)
      after_initialize do
        require 'dispatcher' unless defined?(::Dispatcher)
        Dispatcher.to_prepare(&callback)
      end
    end

    def middleware
      require 'action_controller'
      ActionController::Dispatcher.middleware
    end

    def builtin_directories
      # Include builtins only in the development environment.
      (environment == 'development') ? Dir["#{RAILTIES_PATH}/builtin/*/"] : []
    end

    def framework_paths
      paths = %w(railties railties/lib activesupport/lib)
      paths << 'actionpack/lib' if frameworks.include?(:action_controller) || frameworks.include?(:action_view)

      [:active_record, :action_mailer, :active_resource, :action_web_service].each do |framework|
        paths << "#{framework.to_s.gsub('_', '')}/lib" if frameworks.include?(framework)
      end

      paths.map { |dir| "#{framework_root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
    end

    private
      def framework_root_path
        defined?(::RAILS_FRAMEWORK_ROOT) ? ::RAILS_FRAMEWORK_ROOT : "#{root_path}/vendor/rails"
      end

      def default_frameworks
        [ :active_record, :action_controller, :action_view, :action_mailer, :active_resource ]
      end

      def default_load_paths
        paths = []

        # Add the old mock paths only if the directories exists
        paths.concat(Dir["#{root_path}/test/mocks/#{environment}"]) if File.exists?("#{root_path}/test/mocks/#{environment}")

        # Add the app's controller directory
        paths.concat(Dir["#{root_path}/app/controllers/"])

        # Followed by the standard includes.
        paths.concat %w(
          app
          app/metal
          app/models
          app/controllers
          app/helpers
          app/services
          lib
          vendor
        ).map { |dir| "#{root_path}/#{dir}" }.select { |dir| File.directory?(dir) }

        paths.concat builtin_directories
      end

      # Doesn't matter since plugins aren't in load_paths yet.
      def default_load_once_paths
        []
      end

      def default_eager_load_paths
        %w(
          app/metal
          app/models
          app/controllers
          app/helpers
        ).map { |dir| "#{root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
      end

      def default_log_path
        File.join(root_path, 'log', "#{environment}.log")
      end

      def default_log_level
        environment == 'production' ? :info : :debug
      end

      def default_database_configuration_file
        File.join(root_path, 'config', 'database.yml')
      end

      def default_routes_configuration_file
        File.join(root_path, 'config', 'routes.rb')
      end

      def default_view_path
        File.join(root_path, 'app', 'views')
      end

      def default_controller_paths
        paths = [File.join(root_path, 'app', 'controllers')]
        paths.concat builtin_directories
        paths
      end

      def default_dependency_loading
        true
      end

      def default_preload_frameworks
        false
      end

      def default_cache_classes
        true
      end

      def default_whiny_nils
        false
      end

      def default_plugins
        nil
      end

      def default_plugin_paths
        ["#{root_path}/vendor/plugins"]
      end

      def default_plugin_locators
        locators = []
        locators << Plugin::GemLocator if defined? Gem
        locators << Plugin::FileSystemLocator
      end

      def default_plugin_loader
        Plugin::Loader
      end

      def default_cache_store
        if File.exist?("#{root_path}/tmp/cache/")
          [ :file_store, "#{root_path}/tmp/cache/" ]
        else
          :memory_store
        end
      end

      def default_gems
        []
      end

      def default_i18n
        i18n = Rails::OrderedOptions.new
        i18n.load_path = []

        if File.exist?(File.join(RAILS_ROOT, 'config', 'locales'))
          i18n.load_path << Dir[File.join(RAILS_ROOT, 'config', 'locales', '*.{rb,yml}')]
          i18n.load_path.flatten!
        end

        i18n
      end
  end
end

# Needs to be duplicated from Active Support since its needed before Active
# Support is available. Here both Options and Hash are namespaced to prevent
# conflicts with other implementations AND with the classes residing in Active Support.
class Rails::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