Spawning of Rack applications.
Methods
Included Modules
Classes and Modules
Class PhusionPassenger::Rack::ApplicationSpawner::ErrorPublic Class methods
The following options are accepted:
- ‘app_root‘
See SpawnManager#spawn_application for information about the options.
[ show source ]
# File lib/phusion_passenger/rack/application_spawner.rb, line 95 95: def initialize(options) 96: super() 97: @options = sanitize_spawn_options(options) 98: @app_root = @options["app_root"] 99: @canonicalized_app_root = canonicalize_path(@app_root) 100: self.max_idle_time = DEFAULT_APP_SPAWNER_MAX_IDLE_TIME 101: define_message_handler(:spawn_application, :handle_spawn_application) 102: end
Spawn an instance of the given Rack application. When successful, an AppProcess object will be returned, which represents the spawned application.
Accepts the same options as SpawnManager#spawn_application.
Raises:
- AppInitError: The Rack application raised an exception or called exit() during startup.
- SystemCallError, IOError, SocketError: Something went wrong.
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# File lib/phusion_passenger/rack/application_spawner.rb, line 59 59: def self.spawn_application(options = {}) 60: options = sanitize_spawn_options(options) 61: 62: a, b = UNIXSocket.pair 63: pid = safe_fork(self.class.to_s, true) do 64: a.close 65: 66: file_descriptors_to_leave_open = [0, 1, 2, b.fileno] 67: NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open) 68: close_all_io_objects_for_fds(file_descriptors_to_leave_open) 69: 70: channel = MessageChannel.new(b) 71: app = nil 72: success = report_app_init_status(channel) do 73: prepare_app_process('config.ru', options) 74: app = load_rack_app 75: after_loading_app_code(options) 76: end 77: if success 78: start_request_handler(channel, app, false, options) 79: end 80: end 81: b.close 82: Process.waitpid(pid) rescue nil 83: 84: channel = MessageChannel.new(a) 85: unmarshal_and_raise_errors(channel, options["print_exceptions"], "rack") 86: 87: # No exception was raised, so spawning succeeded. 88: return AppProcess.read_from_channel(channel) 89: end
Public Instance methods
Spawns an instance of the Rack application. When successful, an AppProcess object will be returned, which represents the spawned Rack application.
options will be passed to the request handler‘s constructor.
Raises:
- AbstractServer::ServerNotStarted: The ApplicationSpawner server hasn‘t already been started.
- ApplicationSpawner::Error: The ApplicationSpawner server exited unexpectedly.
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# File lib/phusion_passenger/rack/application_spawner.rb, line 112 112: def spawn_application(options = {}) 113: connect do |channel| 114: channel.write("spawn_application", *options.to_a.flatten) 115: return AppProcess.read_from_channel(channel) 116: end 117: rescue SystemCallError, IOError, SocketError => e 118: raise Error, "The application spawner server exited unexpectedly: #{e}" 119: end
Overrided from AbstractServer#start.
May raise these additional exceptions:
- AppInitError: The Rack application raised an exception or called exit() during startup.
- ApplicationSpawner::Error: The ApplicationSpawner server exited unexpectedly.
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# File lib/phusion_passenger/rack/application_spawner.rb, line 127 127: def start 128: super 129: begin 130: channel = MessageChannel.new(@owner_socket) 131: unmarshal_and_raise_errors(channel, @options["print_exceptions"]) 132: rescue IOError, SystemCallError, SocketError => e 133: stop if started? 134: raise Error, "The application spawner server exited unexpectedly: #{e}" 135: rescue 136: stop if started? 137: raise 138: end 139: end