Class for spawning WSGI applications.
# File lib/phusion_passenger/wsgi/application_spawner.rb, line 40 def self.spawn_application(*args) @@instance ||= ApplicationSpawner.new @@instance.spawn_application(*args) end
Spawn an instance of the given WSGI application. When successful, an Application object will be returned, which represents the spawned application.
Raises:
AppInitError: The WSGI application raised an exception or called exit() during startup.
SystemCallError, IOError, SocketError: Something went wrong.
# File lib/phusion_passenger/wsgi/application_spawner.rb, line 53 def spawn_application(options) a, b = UNIXSocket.pair pid = safe_fork(self.class.to_s, true) do a.close file_descriptors_to_leave_open = [0, 1, 2, b.fileno] NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open) close_all_io_objects_for_fds(file_descriptors_to_leave_open) run(MessageChannel.new(b), options) end b.close Process.waitpid(pid) rescue nil channel = MessageChannel.new(a) return AppProcess.read_from_channel(channel) end
# File lib/phusion_passenger/wsgi/application_spawner.rb, line 72 def run(channel, options) $0 = "WSGI: #{options['app_group_name']}" prepare_app_process("passenger_wsgi.py", options) ENV['WSGI_ENV'] = options['environment'] if defined?(NativeSupport) unix_path_max = NativeSupport::UNIX_PATH_MAX else unix_path_max = 100 end socket_file = "#{passenger_tmpdir}/backends/wsgi.#{Process.pid}.#{rand 10000000}" socket_file = socket_file.slice(0, unix_path_max - 1) server = UNIXServer.new(socket_file) begin File.chmod(0666, socket_file) reader, writer = IO.pipe app_process = AppProcess.new(options["app_root"], Process.pid, writer, :main => [socket_file, 'unix']) app_process.write_to_channel(channel) writer.close channel.close NativeSupport.close_all_file_descriptors([0, 1, 2, server.fileno, reader.fileno]) exec(REQUEST_HANDLER, socket_file, server.fileno.to_s, reader.fileno.to_s) rescue server.close File.unlink(socket_file) raise end end