FIX: deprecation warning - initialization autoloaded the constant (#12400)

Get rid of deprecation related to Zeitwerk autoloader.

Original PR was reverted because of multisite bug #12381 - thank you @davidtaylorhq for fixing it.

I added the last commit to fix that multisite problem.

config/application.rb

@@ -55,6 +55,8 @@ require 'pry-rails' if Rails.env.development?
 
 require 'discourse_fonts'
 
+require_relative '../lib/zeitwerk_config.rb'
+
 if defined?(Bundler)
   bundler_groups = [:default]
 
@@ -116,6 +118,7 @@ module Discourse
     config.autoload_paths += Dir["#{config.root}/lib/validators/"]
 
     Rails.autoloaders.main.ignore(Dir["#{config.root}/app/models/reports"])
+    Rails.autoloaders.main.ignore(Dir["#{config.root}/lib/freedom_patches"])
 
     # Only load the plugins named here, in the order given (default is alphabetical).
     # :all can be used as a placeholder for all plugins not explicitly named.

config/initializers/002-freedom_patches.rb

@@ -1,5 +1,13 @@
 # frozen_string_literal: true
 
-Dir["#{Rails.root}/lib/freedom_patches/*.rb"].each do |f|
+# Multisite freedom patch defines RailsMultisite::DiscoursePatches.config which is used  by 200-first_middlewares.rb
+# Therefore it can not be postponed with .to_prepare
+RUN_WITHOUT_PREPARE = ["#{Rails.root}/lib/freedom_patches/rails_multisite.rb"]
+RUN_WITHOUT_PREPARE.each { |path| require(path) }
+
+Rails.application.reloader.to_prepare do
+  Dir["#{Rails.root}/lib/freedom_patches/*.rb"].each do |f|
+    next if RUN_WITHOUT_PREPARE.any? { |path| path == f }
     require(f)
+  end
 end

config/initializers/005-site_settings.rb

@@ -16,7 +16,8 @@ if GlobalSetting.skip_redis?
   return
 end
 
-reload_settings = lambda {
+Rails.application.reloader.to_prepare do
+  reload_settings = lambda {
     RailsMultisite::ConnectionManagement.safe_each_connection do
       begin
         SiteSetting.refresh!
@@ -28,12 +29,13 @@ reload_settings = lambda {
         # This will happen when migrating a new database
       end
     end
-}
+  }
 
-reload_settings.call
+  reload_settings.call
 
-if !Rails.configuration.cache_classes
+  if !Rails.configuration.cache_classes
     ActiveSupport::Reloader.to_prepare do
       reload_settings.call
     end
+  end
 end

config/initializers/100-i18n.rb

@@ -5,15 +5,17 @@
 require 'i18n/backend/discourse_i18n'
 require 'i18n/backend/fallback_locale_list'
 
-I18n.backend = I18n::Backend::DiscourseI18n.new
-I18n.fallbacks = I18n::Backend::FallbackLocaleList.new
-I18n.config.missing_interpolation_argument_handler = proc { throw(:exception) }
-I18n.reload!
-I18n.init_accelerator!(overrides_enabled: ENV['DISABLE_TRANSLATION_OVERRIDES'] != '1')
+Rails.application.reloader.to_prepare do
+  I18n.backend = I18n::Backend::DiscourseI18n.new
+  I18n.fallbacks = I18n::Backend::FallbackLocaleList.new
+  I18n.config.missing_interpolation_argument_handler = proc { throw(:exception) }
+  I18n.reload!
+  I18n.init_accelerator!(overrides_enabled: ENV['DISABLE_TRANSLATION_OVERRIDES'] != '1')
 
-unless Rails.env.test?
+  unless Rails.env.test?
     MessageBus.subscribe("/i18n-flush") do
       I18n.reload!
       ExtraLocalesController.clear_cache!
     end
+  end
 end

config/initializers/100-logster.rb

@@ -1,22 +1,25 @@
 # frozen_string_literal: true
 
 if GlobalSetting.skip_redis?
+  Rails.application.reloader.to_prepare do
     if Rails.logger.respond_to? :chained
       Rails.logger = Rails.logger.chained.first
     end
+  end
   return
 end
 
-if Rails.env.development? && RUBY_VERSION.match?(/^2\.5\.[23]/)
+Rails.application.reloader.to_prepare do
+  if Rails.env.development? && RUBY_VERSION.match?(/^2\.5\.[23]/)
     STDERR.puts "WARNING: Discourse development environment runs slower on Ruby 2.5.3 or below"
     STDERR.puts "We recommend you upgrade to Ruby 2.6.1 for the optimal development performance"
 
     # we have to used to older and slower version of the logger cause the new one exposes a Ruby bug in
     # the Queue class which causes segmentation faults
     Logster::Scheduler.disable
-end
+  end
 
-if Rails.env.development? && !Sidekiq.server? && ENV["RAILS_LOGS_STDOUT"] == "1"
+  if Rails.env.development? && !Sidekiq.server? && ENV["RAILS_LOGS_STDOUT"] == "1"
     console = ActiveSupport::Logger.new(STDOUT)
     original_logger = Rails.logger.chained.first
     console.formatter = original_logger.formatter
@@ -25,9 +28,9 @@ if Rails.env.development? && !Sidekiq.server? && ENV["RAILS_LOGS_STDOUT"] == "1"
     unless ActiveSupport::Logger.logger_outputs_to?(original_logger, STDOUT)
       original_logger.extend(ActiveSupport::Logger.broadcast(console))
     end
-end
+  end
 
-if Rails.env.production?
+  if Rails.env.production?
     Logster.store.ignore = [
       # honestly, Rails should not be logging this, its real noisy
       /^ActionController::RoutingError \(No route matches/,
@@ -79,24 +82,24 @@ if Rails.env.production?
       /^Creating scope :open\. Overwriting existing method Poll\.open\./,
     ]
     Logster.config.env_expandable_keys.push(:hostname, :problem_db)
-end
+  end
 
-Logster.store.max_backlog = GlobalSetting.max_logster_logs
+  Logster.store.max_backlog = GlobalSetting.max_logster_logs
 
-# TODO logster should be able to do this automatically
-Logster.config.subdirectory = "#{GlobalSetting.relative_url_root}/logs"
+  # TODO logster should be able to do this automatically
+  Logster.config.subdirectory = "#{GlobalSetting.relative_url_root}/logs"
 
-Logster.config.application_version = Discourse.git_version
-Logster.config.enable_custom_patterns_via_ui = true
-Logster.config.enable_js_error_reporting = GlobalSetting.enable_js_error_reporting
+  Logster.config.application_version = Discourse.git_version
+  Logster.config.enable_custom_patterns_via_ui = true
+  Logster.config.enable_js_error_reporting = GlobalSetting.enable_js_error_reporting
 
-store = Logster.store
-redis = Logster.store.redis
-store.redis_prefix = Proc.new { redis.namespace }
-store.redis_raw_connection = redis.without_namespace
-severities = [Logger::WARN, Logger::ERROR, Logger::FATAL, Logger::UNKNOWN]
+  store = Logster.store
+  redis = Logster.store.redis
+  store.redis_prefix = Proc.new { redis.namespace }
+  store.redis_raw_connection = redis.without_namespace
+  severities = [Logger::WARN, Logger::ERROR, Logger::FATAL, Logger::UNKNOWN]
 
-RailsMultisite::ConnectionManagement.each_connection do
+  RailsMultisite::ConnectionManagement.each_connection do
     error_rate_per_minute = SiteSetting.alert_admins_if_errors_per_minute rescue 0
 
     if (error_rate_per_minute || 0) > 0
@@ -126,23 +129,24 @@ RailsMultisite::ConnectionManagement.each_connection do
                           )
       end
     end
-end
+  end
 
-if Rails.configuration.multisite
+  if Rails.configuration.multisite
     if Rails.logger.respond_to? :chained
       chained = Rails.logger.chained
       chained && chained.first.formatter = RailsMultisite::Formatter.new
     end
-end
+  end
 
-Logster.config.project_directories = [
+  Logster.config.project_directories = [
     { path: Rails.root.to_s, url: "https://github.com/discourse/discourse", main_app: true }
-]
-Discourse.plugins.each do |plugin|
+  ]
+  Discourse.plugins.each do |plugin|
     next if !plugin.metadata.url
 
     Logster.config.project_directories << {
       path: "#{Rails.root.to_s}/plugins/#{plugin.directory_name}",
       url: plugin.metadata.url
     }
+  end
 end