class Rack::Server

Attributes

options[W]

Public Class Methods

logging_middleware() click to toggle source
# File lib/rack/server.rb, line 202
def self.logging_middleware
  lambda { |server|
    server.server.name =~ /CGI/ ? nil : [Rack::CommonLogger, $stderr]
  }
end
middleware() click to toggle source
# File lib/rack/server.rb, line 208
def self.middleware
  @middleware ||= begin
    m = Hash.new {|h,k| h[k] = []}
    m["deployment"].concat [
      [Rack::ContentLength],
      [Rack::Chunked],
      logging_middleware
    ]
    m["development"].concat m["deployment"] + [[Rack::ShowExceptions], [Rack::Lint]]
    m
  end
end
new(options = nil) click to toggle source

Options may include:

  • :app

    a rack application to run (overrides :config)
    
  • :config

    a rackup configuration file path to load (.ru)
  • :environment

    this selects the middleware that will be wrapped around
    your application. Default options available are:
      - development: CommonLogger, ShowExceptions, and Lint
      - deployment: CommonLogger
      - none: no extra middleware
    note: when the server is a cgi server, CommonLogger is not included.
  • :server

    choose a specific Rack::Handler, e.g. cgi, fcgi, webrick
    
  • :daemonize

    if true, the server will daemonize itself (fork, detach, etc)
  • :pid

    path to write a pid file after daemonize
    
  • :Host

    the host address to bind to (used by supporting Rack::Handler)
    
  • :Port

    the port to bind to (used by supporting Rack::Handler)
    
  • :AccessLog

    webrick acess log options (or supporting Rack::Handler)
  • :debug

    turn on debug output ($DEBUG = true)
    
  • :warn

    turn on warnings ($-w = true)
    
  • :include

    add given paths to $LOAD_PATH
    
  • :require

    require the given libraries
    
# File lib/rack/server.rb, line 178
def initialize(options = nil)
  @options = options
  @app = options[:app] if options && options[:app]
end
start(options = nil) click to toggle source

Start a new rack server (like running rackup). This will parse ARGV and provide standard ARGV rackup options, defaulting to load 'config.ru'.

Providing an options hash will prevent ARGV parsing and will not include any default options.

This method can be used to very easily launch a CGI application, for example:

Rack::Server.start(
  :app => lambda do |e|
    [200, {'Content-Type' => 'text/html'}, ['hello world']]
  end,
  :server => 'cgi'
)

Further options available here are documented on Rack::Server#initialize

# File lib/rack/server.rb, line 140
def self.start(options = nil)
  new(options).start
end

Public Instance Methods

app() click to toggle source
# File lib/rack/server.rb, line 198
def app
  @app ||= options[:builder] ? build_app_from_string : build_app_and_options_from_config
end
default_options() click to toggle source
# File lib/rack/server.rb, line 187
def default_options
  {
    :environment => ENV['RACK_ENV'] || "development",
    :pid         => nil,
    :Port        => 9292,
    :Host        => "0.0.0.0",
    :AccessLog   => [],
    :config      => "config.ru"
  }
end
middleware() click to toggle source
# File lib/rack/server.rb, line 221
def middleware
  self.class.middleware
end
options() click to toggle source
# File lib/rack/server.rb, line 183
def options
  @options ||= parse_options(ARGV)
end
server() click to toggle source
# File lib/rack/server.rb, line 267
def server
  @_server ||= Rack::Handler.get(options[:server]) || Rack::Handler.default(options)
end
start(&blk) click to toggle source
# File lib/rack/server.rb, line 225
def start &blk
  if options[:warn]
    $-w = true
  end

  if includes = options[:include]
    $LOAD_PATH.unshift(*includes)
  end

  if library = options[:require]
    require library
  end

  if options[:debug]
    $DEBUG = true
    require 'pp'
    p options[:server]
    pp wrapped_app
    pp app
  end

  check_pid! if options[:pid]

  # Touch the wrapped app, so that the config.ru is loaded before
  # daemonization (i.e. before chdir, etc).
  wrapped_app

  daemonize_app if options[:daemonize]

  write_pid if options[:pid]

  trap(:INT) do
    if server.respond_to?(:shutdown)
      server.shutdown
    else
      exit
    end
  end

  server.run wrapped_app, options, &blk
end

Private Instance Methods

build_app(app) click to toggle source
# File lib/rack/server.rb, line 303
def build_app(app)
  middleware[options[:environment]].reverse_each do |middleware|
    middleware = middleware.call(self) if middleware.respond_to?(:call)
    next unless middleware
    klass, *args = middleware
    app = klass.new(app, *args)
  end
  app
end
build_app_and_options_from_config() click to toggle source
# File lib/rack/server.rb, line 272
def build_app_and_options_from_config
  if !::File.exist? options[:config]
    abort "configuration #{options[:config]} not found"
  end

  app, options = Rack::Builder.parse_file(self.options[:config], opt_parser)
  self.options.merge! options
  app
end
build_app_from_string() click to toggle source
# File lib/rack/server.rb, line 282
def build_app_from_string
  Rack::Builder.new_from_string(self.options[:builder])
end
check_pid!() click to toggle source
# File lib/rack/server.rb, line 339
def check_pid!
  case pidfile_process_status
  when :running, :not_owned
    $stderr.puts "A server is already running. Check #{options[:pid]}."
    exit(1)
  when :dead
    ::File.delete(options[:pid])
  end
end
daemonize_app() click to toggle source
# File lib/rack/server.rb, line 317
def daemonize_app
  if RUBY_VERSION < "1.9"
    exit if fork
    Process.setsid
    exit if fork
    Dir.chdir "/"
    STDIN.reopen "/dev/null"
    STDOUT.reopen "/dev/null", "a"
    STDERR.reopen "/dev/null", "a"
  else
    Process.daemon
  end
end
opt_parser() click to toggle source
# File lib/rack/server.rb, line 299
def opt_parser
  Options.new
end
parse_options(args) click to toggle source
# File lib/rack/server.rb, line 286
def parse_options(args)
  options = default_options

  # Don't evaluate CGI ISINDEX parameters.
  # http://www.meb.uni-bonn.de/docs/cgi/cl.html
  args.clear if ENV.include?("REQUEST_METHOD")

  options.merge! opt_parser.parse!(args)
  options[:config] = ::File.expand_path(options[:config])
  ENV["RACK_ENV"] = options[:environment]
  options
end
pidfile_process_status() click to toggle source
# File lib/rack/server.rb, line 349
def pidfile_process_status
  return :exited unless ::File.exist?(options[:pid])

  pid = ::File.read(options[:pid]).to_i
  Process.kill(0, pid)
  :running
rescue Errno::ESRCH
  :dead
rescue Errno::EPERM
  :not_owned
end
wrapped_app() click to toggle source
# File lib/rack/server.rb, line 313
def wrapped_app
  @wrapped_app ||= build_app app
end
write_pid() click to toggle source
# File lib/rack/server.rb, line 331
def write_pid
  ::File.open(options[:pid], ::File::CREAT | ::File::EXCL | ::File::WRONLY ){ |f| f.write("#{Process.pid}") }
  at_exit { ::File.delete(options[:pid]) if ::File.exist?(options[:pid]) }
rescue Errno::EEXIST
  check_pid!
  retry
end