mperham--sidekiq/lib/sidekiq/rails.rb

# frozen_string_literal: true
module Sidekiq
  class Rails < ::Rails::Engine
    # We need to setup this up before any application configuration which might
    # change Sidekiq middleware.
    #
    # This hook happens after `Rails::Application` is inherited within
    # config/application.rb and before config is touched, usually within the
    # class block. Definitely before config/environments/*.rb and
    # config/initializers/*.rb.
    config.before_configuration do
      if ::Rails::VERSION::MAJOR < 5 && defined?(::ActiveRecord)
        Sidekiq.server_middleware do |chain|
          require 'sidekiq/middleware/server/active_record'
          chain.add Sidekiq::Middleware::Server::ActiveRecord
        end
      end
    end

    config.after_initialize do
      # This hook happens after all initializers are run, just before returning
      # from config/environment.rb back to sidekiq/cli.rb.
      # We have to add the reloader after initialize to see if cache_classes has
      # been turned on.
      #
      # None of this matters on the client-side, only within the Sidekiq process itself.
      #
      Sidekiq.configure_server do |_|
        if ::Rails::VERSION::MAJOR >= 5
          # The reloader also takes care of ActiveRecord but is incompatible with
          # the ActiveRecord middleware so make sure it's not in the chain already.
          if defined?(Sidekiq::Middleware::Server::ActiveRecord) && Sidekiq.server_middleware.exists?(Sidekiq::Middleware::Server::ActiveRecord)
            raise ArgumentError, "You are using the Sidekiq ActiveRecord middleware and the new Rails 5 reloader which are incompatible. Please remove the ActiveRecord middleware from your Sidekiq middleware configuration."
          elsif ::Rails.application.config.cache_classes
            # The reloader API has proven to be troublesome under load in production.
            # We won't use it at all when classes are cached, see #3154
            Sidekiq.logger.debug { "Autoload disabled in #{::Rails.env}, Sidekiq will not reload changed classes" }
            Sidekiq.options[:executor] = Sidekiq::Rails::Executor.new
          else
            Sidekiq.logger.debug { "Enabling Rails 5+ live code reloading, so hot!" }
            Sidekiq.options[:reloader] = Sidekiq::Rails::Reloader.new
            Psych::Visitors::ToRuby.prepend(Sidekiq::Rails::PsychAutoload)
          end
        end
      end
    end

    class Executor
      def initialize(app = ::Rails.application)
        @app = app
      end

      def call
        @app.executor.wrap do
          yield
        end
      end

      def inspect
        "#<Sidekiq::Rails::Executor @app=#{@app.class.name}>"
      end
    end

    class Reloader
      def initialize(app = ::Rails.application)
        @app = app
      end

      def call
        @app.reloader.wrap do
          yield
        end
      end

      def inspect
        "#<Sidekiq::Rails::Reloader @app=#{@app.class.name}>"
      end
    end

    module PsychAutoload
      def resolve_class(klass_name)
        klass_name && klass_name.constantize
      rescue NameError
        super
      end
    end
  end if defined?(::Rails)
end