new_contents: ﻿#!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  # Copyright (c) 2014 clowwindy
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  import time
  import os
  import socket
  import struct
  import re
  import logging
  from shadowsocks import common
  from shadowsocks import lru_cache
  from shadowsocks import eventloop
  import server_pool
  import Config
  
  class ServerMgr(object):
  
      def __init__(self):
          self._loop = None
          self._request_id = 1
          self._hosts = {}
          self._hostname_status = {}
          self._hostname_to_cb = {}
          self._cb_to_hostname = {}
          self._last_time = time.time()
          self._sock = None
          self._servers = None
  
      def add_to_loop(self, loop):
          if self._loop:
              raise Exception('already add to loop')
          self._loop = loop
          # TODO when dns server is IPv6
          self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
                                     socket.SOL_UDP)
          self._sock.bind((Config.MANAGE_BIND_IP, Config.MANAGE_PORT))
          self._sock.setblocking(False)
          loop.add(self._sock, eventloop.POLL_IN, self)
  
      def _handle_data(self, sock):
          data, addr = sock.recvfrom(128)
          #manage pwd:port:passwd:action
          args = data.split(':')
          if len(args) < 4:
              return
          if args[0] == Config.MANAGE_PASS:
              if args[3] == '0':
                  server_pool.ServerPool.get_instance().cb_del_server(args[1])
              elif args[3] == '1':
                  server_pool.ServerPool.get_instance().new_server(args[1], args[2])
  
      def handle_event(self, sock, fd, event):
          if sock != self._sock:
              return
          if event & eventloop.POLL_ERR:
              logging.error('mgr socket err')
              self._loop.remove(self._sock)
              self._sock.close()
              # TODO when dns server is IPv6
              self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
                                         socket.SOL_UDP)
              self._sock.setblocking(False)
              self._loop.add(self._sock, eventloop.POLL_IN, self)
          else:
              self._handle_data(sock)
  
      def close(self):
          if self._sock:
              if self._loop:
                  self._loop.remove(self._sock)
              self._sock.close()
              self._sock = None
  
  
  def test():
      pass
  
  if __name__ == '__main__':
      test()
  
subject: fix handle_event