Class: Rack::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/server.rb

Defined Under Namespace

Classes: Options

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = nil) ⇒ Server

Options may include:

  • :app

    a rack application to run (overrides :config and :builder)

  • :builder

    a string to evaluate a Rack::Builder from

  • :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 access 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

Additional options for profiling app initialization include:

  • :heapfile

    location for ObjectSpace.dump_all to write the output to

  • :profile_file

    location for CPU/Memory (StackProf) profile output (defaults to a tempfile)

  • :profile_mode

    StackProf profile mode (cpu|wall|object)



217
218
219
220
221
222
223
224
225
226
227
228
229
 
# File 'lib/rack/server.rb', line 217

def initialize(options = nil)
  @ignore_options = []

  if options
    @use_default_options = false
    @options = options
    @app = options[:app] if options[:app]
  else
    argv = defined?(SPEC_ARGV) ? SPEC_ARGV : ARGV
    @use_default_options = true
    @options = parse_options(argv)
  end
end

Instance Attribute Details

#options ⇒ Object 



231
232
233
234
 
# File 'lib/rack/server.rb', line 231

def options
  merged_options = @use_default_options ? default_options.merge(@options) : @options
  merged_options.reject { |k, v| @ignore_options.include?(k) }
end

Class Method Details

.default_middleware_by_environment ⇒ Object 



261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
 
# File 'lib/rack/server.rb', line 261

def default_middleware_by_environment
  m = Hash.new {|h, k| h[k] = []}
  m["deployment"] = [
    [Rack::ContentLength],
    logging_middleware,
    [Rack::TempfileReaper]
  ]
  m["development"] = [
    [Rack::ContentLength],
    logging_middleware,
    [Rack::ShowExceptions],
    [Rack::Lint],
    [Rack::TempfileReaper]
  ]

  m
end

.logging_middleware ⇒ Object 



255
256
257
258
259
 
# File 'lib/rack/server.rb', line 255

def logging_middleware
  lambda { |server|
    /CGI/.match?(server.server.name) || server.options[:quiet] ? nil : [Rack::CommonLogger, $stderr]
  }
end

.middleware ⇒ Object 



279
280
281
 
# File 'lib/rack/server.rb', line 279

def middleware
  default_middleware_by_environment
end

.start(options = nil) ⇒ Object

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



169
170
171
 
# File 'lib/rack/server.rb', line 169

def self.start(options = nil)
  new(options).start
end

Instance Method Details

#app ⇒ Object 



250
251
252
 
# File 'lib/rack/server.rb', line 250

def app
  @app ||= options[:builder] ? build_app_from_string : build_app_and_options_from_config
end

#default_options ⇒ Object 



236
237
238
239
240
241
242
243
244
245
246
247
248
 
# File 'lib/rack/server.rb', line 236

def default_options
  environment  = ENV['RACK_ENV'] || 'development'
  default_host = environment == 'development' ? 'localhost' : '0.0.0.0'

  {
    environment: environment,
    pid: nil,
    Port: 9292,
    Host: default_host,
    AccessLog: [],
    config: "config.ru"
  }
end

#middleware ⇒ Object 



284
285
286
 
# File 'lib/rack/server.rb', line 284

def middleware
  self.class.middleware
end

#server ⇒ Object 



332
333
334
335
336
337
338
339
340
341
342
343
 
# File 'lib/rack/server.rb', line 332

def server
  @_server ||= Rack::Handler.get(options[:server])

  unless @_server
    @_server = Rack::Handler.default

    # We already speak FastCGI
    @ignore_options = [:File, :Port] if @_server.to_s == 'Rack::Handler::FastCGI'
  end

  @_server
end

#start(&blk) ⇒ Object 



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
 
# File 'lib/rack/server.rb', line 288

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).
  handle_profiling(options[:heapfile], options[:profile_mode], options[:profile_file]) do
    wrapped_app
  end

  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