Refactor script/server into an object that inherits from Rack::Server

railties/lib/rails/commands/server.rb

-require 'action_dispatch'
-
 require 'fileutils'
 require 'optparse'
+require 'action_dispatch'
 
-options = {
-  :Port        => 3000,
-  :Host        => "0.0.0.0",
-  :environment => (ENV['RAILS_ENV'] || "development").dup,
-  :config      => "#{Rails.root}/config.ru",
-  :detach      => false,
-  :debugger    => false
-}
+module Rails
+  class Server < ::Rack::Server
+    class Options
+      def parse!(args)
+        options = {}
+        args    = args.dup
+        opt_parser = OptionParser.new do |opts|
+          opts.on("-p", "--port=port", Integer,
+                  "Runs Rails on the specified port.", "Default: #{options[:Port]}") { |v| options[:Port] = v }
+          opts.on("-b", "--binding=ip", String,
+                  "Binds Rails to the specified ip.", "Default: #{options[:Host]}") { |v| options[:Host] = v }
+          opts.on("-c", "--config=file", String,
+                  "Use custom rackup configuration file") { |v| options[:config] = v }
+          opts.on("-d", "--daemon", "Make server run as a Daemon.") { options[:daemonize] = true }
+          opts.on("-u", "--debugger", "Enable ruby-debugging for the server.") { options[:debugger] = true }
+          opts.on("-e", "--environment=name", String,
+                  "Specifies the environment to run this server under (test/development/production).",
+                  "Default: #{options[:environment]}") { |v| options[:environment] = v }
 
-ARGV.clone.options do |opts|
-  opts.on("-p", "--port=port", Integer,
-          "Runs Rails on the specified port.", "Default: #{options[:Port]}") { |v| options[:Port] = v }
-  opts.on("-b", "--binding=ip", String,
-          "Binds Rails to the specified ip.", "Default: #{options[:Host]}") { |v| options[:Host] = v }
-  opts.on("-c", "--config=file", String,
-          "Use custom rackup configuration file") { |v| options[:config] = v }
-  opts.on("-d", "--daemon", "Make server run as a Daemon.") { options[:detach] = true }
-  opts.on("-u", "--debugger", "Enable ruby-debugging for the server.") { options[:debugger] = true }
-  opts.on("-e", "--environment=name", String,
-          "Specifies the environment to run this server under (test/development/production).",
-          "Default: #{options[:environment]}") { |v| options[:environment] = v }
+          opts.separator ""
 
-  opts.separator ""
+          opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
+        end
 
-  opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
+        opt_parser.parse! args
 
-  opts.parse!
-end
+        options[:server] = args.shift
+        options
+      end
+    end
 
-server = Rack::Handler.get(ARGV.first) rescue nil
-unless server
-  begin
-    server = Rack::Handler::Mongrel
-  rescue LoadError => e
-    server = Rack::Handler::WEBrick
-  end
-end
+    def opt_parser
+      Options.new
+    end
 
-puts "=> Booting #{ActiveSupport::Inflector.demodulize(server)}"
-puts "=> Rails #{Rails.version} application starting on http://#{options[:Host]}:#{options[:Port]}"
+    def start
+      puts "=> Booting #{ActiveSupport::Inflector.demodulize(server)}"
+      puts "=> Rails #{Rails.version} application starting on http://#{options[:Host]}:#{options[:Port]}"
+      puts "=> Call with -d to detach" unless options[:daemonize]
+      trap(:INT) { exit }
+      puts "=> Ctrl-C to shutdown server" unless options[:daemonize]
 
-if options[:detach]
-  Process.daemon
-  pid = "#{Rails.root}/tmp/pids/server.pid"
-  File.open(pid, 'w'){ |f| f.write(Process.pid) }
-  at_exit { File.delete(pid) if File.exist?(pid) }
-end
-
-ENV["RAILS_ENV"] = options[:environment]
-RAILS_ENV.replace(options[:environment]) if defined?(RAILS_ENV)
-
-app = Rack::Builder.new {
-  use Rails::Rack::LogTailer unless options[:detach]
-  use Rails::Rack::Debugger if options[:debugger]
-  run ActionDispatch::Utils.parse_config(options[:config])
-}.to_app
+      ENV["RAILS_ENV"] = options[:environment]
+      RAILS_ENV.replace(options[:environment]) if defined?(RAILS_ENV)
 
-puts "=> Call with -d to detach"
+      super
+    ensure
+      puts 'Exiting' unless options[:daemonize]
+    end
 
-trap(:INT) { exit }
+    def middleware
+      middlewares = []
+      middlewares << [Rails::Rack::LogTailer] unless options[:daemonize]
+      middlewares << [Rails::Rack::Debugger]  if options[:debugger]
+      Hash.new(middlewares)
+    end
 
-puts "=> Ctrl-C to shutdown server"
-
-begin
-  server.run(app, options.merge(:AccessLog => []))
-ensure
-  puts 'Exiting'
+    def default_options
+      {
+        :Port        => 3000,
+        :Host        => "0.0.0.0",
+        :environment => (ENV['RAILS_ENV'] || "development").dup,
+        :rack_file   => "#{Rails.root}/config.ru",
+        :daemonize   => false,
+        :debugger    => false,
+        :pid         => "#{Rails.root}/tmp/pids/server.pid",
+        :AccessLog   => []
+      }
+    end
+  end
 end

railties/lib/rails/generators/rails/app/templates/script/server

 require File.expand_path('../../config/application',  __FILE__)
 require 'rails/commands/server'
+Rails::Server.start