def handle_write(self):
  sent = self.send(self.buffer)
  self.buffer = self.buffer[sent:]

import socket
import asyncore

class Client(asyncore.dispatcher):
  
  def __init__(self, host, path):
    asyncore.dispatcher.__init__(self)
    self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
    self.connect((host, 80))
    self.buffer = 'GET %s HTTP/1.0\r\n\r\n' % path

  def handle_connect(self):
    pass

  def handle_close(self):
    self.close()

  def handle_read(self):
    print self.recv(8192)

  def writable(self):
    return (len(self.buffer) > 0)

  def handle_write(self):
    sent = self.send(self.buffer)
    self.buffer = self.buffer[sent:]

client = Client('www.python.org', '/')
asyncore.loop()

import socket
import asyncore

class EchoHandler(asyncore.dispatcher_with_send):
  
  def handle_read(self):
    data = self.recv(8192)
    if data:
      self.send(data)


class EchoServer(asyncore.dispatcher):
  
  def __init__(self, host, port):
    asyncore.dispatcher.__init__(self)
    self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
    self.set_reuse_add()
    self.bind((host, port))
    self.listen(5)

  def handle_accept(self):
    pair = self.accept()
    if pair is not None:
      sock, addr = pair
      print 'Incoming connection from %s' % repr(addr)
      handler = EchoHandler(sock)

server = EchoServer('localhost', 8080)
asyncore.loop()

import socket,asyncore

class forwarder(asyncore.dispatcher):
  def __init__(self, ip, port, remoteip,remoteport,backlog=5):
    asyncore.dispatcher.__init__(self)
    self.remoteip=remoteip
    self.remoteport=remoteport
    self.create_socket(socket.AF_INET,socket.SOCK_STREAM)
    self.set_reuse_addr()
    self.bind((ip,port))
    self.listen(backlog)

  def handle_accept(self):
    conn, addr = self.accept()
    # print '--- Connect --- '
    sender(receiver(conn),self.remoteip,self.remoteport)

class receiver(asyncore.dispatcher):
  def __init__(self,conn):
    asyncore.dispatcher.__init__(self,conn)
    self.from_remote_buffer=''
    self.to_remote_buffer=''
    self.sender=None

  def handle_connect(self):
    pass

  def handle_read(self):
    read = self.recv(4096)
    # print 'i -->'%len(read)
    self.from_remote_buffer += read

  def writable(self):
    return (len(self.to_remote_buffer) > 0)

  def handle_write(self):
    sent = self.send(self.to_remote_buffer)
    # print 'i <--'%sent
    self.to_remote_buffer = self.to_remote_buffer[sent:]

  def handle_close(self):
    self.close()
    if self.sender:
      self.sender.close()

class sender(asyncore.dispatcher):
  def __init__(self, receiver, remoteaddr,remoteport):
    asyncore.dispatcher.__init__(self)
    self.receiver=receiver
    receiver.sender=self
    self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
    self.connect((remoteaddr, remoteport))

  def handle_connect(self):
    pass

  def handle_read(self):
    read = self.recv(4096)
    # print '<-- i'%len(read)
    self.receiver.to_remote_buffer += read

  def writable(self):
    return (len(self.receiver.from_remote_buffer) > 0)

  def handle_write(self):
    sent = self.send(self.receiver.from_remote_buffer)
    # print '--> i'%sent
    self.receiver.from_remote_buffer = self.receiver.from_remote_buffer[sent:]

  def handle_close(self):
    self.close()
    self.receiver.close()

if __name__=='__main__':
  import optparse
  parser = optparse.OptionParser()

  parser.add_option(
    '-l','--local-ip',
    dest='local_ip',default='127.0.0.1',
    help='Local IP address to bind to')
  parser.add_option(
    '-p','--local-port',
    type='int',dest='local_port',default=80,
    help='Local port to bind to')
  parser.add_option(
    '-r','--remote-ip',dest='remote_ip',
    help='Local IP address to bind to')
  parser.add_option(
    '-P','--remote-port',
    type='int',dest='remote_port',default=80,
    help='Remote port to bind to')
  options, args = parser.parse_args()

  forwarder(options.local_ip,options.local_port,options.remote_ip,options.remote_port)
  asyncore.loop()