server.py

#!/usr/bin/python
# A simple example of a threaded TCP server in Python.
#
# Copyright (c) 2012 Benoit Sigoure  All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#   - Redistributions of source code must retain the above copyright notice,
#     this list of conditions and the following disclaimer.
#   - Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#   - Neither the name of the StumbleUpon nor the names of its contributors
#     may be used to endorse or promote products derived from this software
#     without specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

import SocketServer
import os
import subprocess
import sys

def daemonize():
  if os.fork() != 0:
    os._exit(0)

  os.setsid()

  if os.fork() != 0:
    os._exit(0)

  os.chdir("/")
  os.umask(022)
  [os.close(i) for i in xrange(3)]
  os.open(os.devnull, os.O_RDWR)
  os.dup2(0, 1)
  os.dup2(0, 2)

class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
  allow_reuse_address = True

class Handler(SocketServer.StreamRequestHandler):
  def handle(self):
    while True:
      command = self.rfile.readline()
      if not command:  # EOF
        break
      self.wfile.write("your command was: %s" % (command,))

def main(args):
  daemonize()
  server = ThreadedTCPServer(("0.0.0.0", 4242), Handler)
  try:
    server.serve_forever()
  except KeyboardInterrupt:
    pass

if __name__ == "__main__":
  sys.exit(main(sys.argv))