Class for spawning WSGI applications.
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 49 49: def spawn_application(app_root, lower_privilege = true, lowest_user = "nobody", environment = "production") 50: a, b = UNIXSocket.pair 51: pid = safe_fork(self.class.to_s, true) do 52: a.close 53: 54: file_descriptors_to_leave_open = [0, 1, 2, b.fileno] 55: NativeSupport.close_all_file_descriptors(file_descriptors_to_leave_open) 56: close_all_io_objects_for_fds(file_descriptors_to_leave_open) 57: 58: run(MessageChannel.new(b), app_root, lower_privilege, lowest_user, environment) 59: end 60: b.close 61: Process.waitpid(pid) rescue nil 62: 63: channel = MessageChannel.new(a) 64: pid, socket_name, socket_type = channel.read 65: if pid.nil? 66: raise IOError, "Connection closed" 67: end 68: owner_pipe = channel.recv_io 69: return Application.new(@app_root, pid, socket_name, 70: socket_type, owner_pipe) 71: end
# File lib/phusion_passenger/wsgi/application_spawner.rb, line 74 74: def run(channel, app_root, lower_privilege, lowest_user, environment) 75: $0 = "WSGI: #{app_root}" 76: ENV['WSGI_ENV'] = environment 77: Dir.chdir(app_root) 78: if lower_privilege 79: lower_privilege('passenger_wsgi.py', lowest_user) 80: end 81: 82: socket_file = "#{passenger_tmpdir}/backends/wsgi_backend.#{Process.pid}.#{rand 10000000}" 83: server = UNIXServer.new(socket_file) 84: begin 85: reader, writer = IO.pipe 86: channel.write(Process.pid, socket_file, "unix") 87: channel.send_io(writer) 88: writer.close 89: channel.close 90: 91: NativeSupport.close_all_file_descriptors([0, 1, 2, server.fileno, 92: reader.fileno]) 93: exec(REQUEST_HANDLER, socket_file, server.fileno.to_s, 94: reader.fileno.to_s) 95: rescue 96: server.close 97: File.unlink(socket_file) 98: raise 99: end 100: end
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