Question

我正在尝试编写一个EventMachine服务器，通过telnet或ssh运行nCurses应用程序，使用ruby 1.9.3的PTY和io / console模块：

require 'rubygems'
require 'socket'
require 'pty'
require 'io/console'
require 'eventmachine'

 module CursesServer
   def post_init
     puts "-- someone connected to the server!"
     @reader, @writer, @pid = PTY.spawn('ruby ./ncurses_app_to_run.rb')
     @reader.sync = true #No buffering stdout     
  end

   def receive_data(data)
     screen = @reader.read(<number_of_bytes>)
     puts "received: " + data # Log input on server side
     send_data screen
     close_connection if data =~ /quit/i
   end

   def unbind
     puts "-- someone disconnected from the server!"
  end
end

# Note that this will block current thread.
EventMachine.run {
  EventMachine.start_server "127.0.0.1", 8081, CursesServer
}

如果我使用传递给@ reader.read的参数值，我可以在客户端显示部分屏幕，但是我不知道如何确定客户端终端的实际大小，无论是初始还是在客户端调整终端大小后。

如何将输出与客户端终端的大小同步？是否可以使用telnet / netcat或者我必须使用更强大的协议，如ssh？

提前致谢。

Answer 1

也许这可以帮到你。不过，我正在使用EventMachine和ZeroMQ，但似乎很容易适应。

def run_command command
    _start = Time.now
    begin
      PTY.spawn( command ) do |r, w, pid|
        r.sync = true
        begin
          r.each do |line|
            $announce_socket.send_msg "LOG:#{line}"
          end
       rescue => ex
        puts "ERROR: #{ex.message}"
       end
     end
    rescue PTY::ChildExited => e
      $announce_socket.send_msg "CMD_PREMATURE_EXIT:#{e.message}"
      puts "command exited prematurely, notified UI"
    end
    $announce_socket.send_msg "CMD_EXIT:#{Time.now - _start}"
    puts "done running commmand (took #{Time.now - _start} seconds)"
  end
end

反应堆部分：

$context = EM::ZeroMQ::Context.new(1)

def cleanup(exit_code = 0)
  EM::stop()
  exit exit_code
end

trap('INT') do
  cleanup
end

EM.run do

  $announce_socket = $context.socket ZMQ::DEALER, EMDEALERHandler.new
  $announce_socket.identity = MY_ID
  $announce_socket.connect "tcp://#{host_ip}:7777"

  # announce presence
  $announce_socket.send_msg "UP"
end

在此之后，你只需要一个ROUTER套接字来推送数据。

将PTY输出与Eventmachine同步

1 个答案: