Class for spawning Rack applications.

Methods
Included Modules
Public Class methods
spawn_application(*args)
    # File lib/phusion_passenger/rack/application_spawner.rb, line 42
42:         def self.spawn_application(*args)
43:                 @@instance ||= ApplicationSpawner.new
44:                 @@instance.spawn_application(*args)
45:         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.

Raises:

  • AppInitError: The Rack application raised an exception or called exit() during startup.
  • SystemCallError, IOError, SocketError: Something went wrong.
    # File lib/phusion_passenger/rack/application_spawner.rb, line 55
55:         def spawn_application(app_root, options = {})
56:                 options = sanitize_spawn_options(options)
57:                 
58:                 a, b = UNIXSocket.pair
59:                 pid = safe_fork(self.class.to_s, true) do
60:                         a.close
61:                         
62:                         file_descriptors_to_leave_open = [0, 1, 2, b.fileno]
63:                         NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open)
64:                         close_all_io_objects_for_fds(file_descriptors_to_leave_open)
65:                         
66:                         run(MessageChannel.new(b), app_root, options)
67:                 end
68:                 b.close
69:                 Process.waitpid(pid) rescue nil
70:                 
71:                 channel = MessageChannel.new(a)
72:                 unmarshal_and_raise_errors(channel, "rack")
73:                 
74:                 # No exception was raised, so spawning succeeded.
75:                 pid, socket_name, socket_type = channel.read
76:                 if pid.nil?
77:                         raise IOError, "Connection closed"
78:                 end
79:                 owner_pipe = channel.recv_io
80:                 return Application.new(@app_root, pid, socket_name,
81:                         socket_type, owner_pipe)
82:         end