Class
PhusionPassenger::Rack::ApplicationSpawner

In: | lib/phusion_passenger/rack/application_spawner.rb
Parent: | Object

Class for spawning Rack applications.

Methods

- spawn_application
- spawn_application

Included Modules

- Utils

Public Class methods
spawn_application(*args)

[ show source ]

        # File lib/phusion_passenger/rack/application_spawner.rb, line 43
    43:         def self.spawn_application(*args)
    44:                 @@instance ||= ApplicationSpawner.new
    45:                 @@instance.spawn_application(*args)
    46:         end

Public Instance methods
spawn_application(app_root, options = {})

Spawn an instance of the given Rack application. When successful, an Application object will be returned, which represents the spawned application.

Accepts the same options as Railz::ApplicationSpawner#initialize.

Raises:

- AppInitError: The Rack application raised an exception or called exit() during startup.
- SystemCallError, IOError, SocketError: Something went wrong.

[ show source ]

        # File lib/phusion_passenger/rack/application_spawner.rb, line 58
    58:         def spawn_application(app_root, options = {})
    59:                 options = sanitize_spawn_options(options)
    60:
    61:                 a, b = UNIXSocket.pair
    62:                 pid = safe_fork(self.class.to_s, true) do
    63:                         a.close
    64:
    65:                         file_descriptors_to_leave_open = [0, 1, 2, b.fileno]
    66:                         NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open)
    67:                         close_all_io_objects_for_fds(file_descriptors_to_leave_open)
    68:
    69:                         run(MessageChannel.new(b), app_root, options)
    70:                 end
    71:                 b.close
    72:                 Process.waitpid(pid) rescue nil
    73:
    74:                 channel = MessageChannel.new(a)
    75:                 unmarshal_and_raise_errors(channel, !!options["print_exceptions"], "rack")
    76:
    77:                 # No exception was raised, so spawning succeeded.
    78:                 pid, socket_name, socket_type = channel.read
    79:                 if pid.nil?
    80:                         raise IOError, "Connection closed"
    81:                 end
    82:                 owner_pipe = channel.recv_io
    83:                 return Application.new(@app_root, pid, socket_name,
    84:                         socket_type, owner_pipe)
    85:         end