#!/usr/bin/python

import SimpleHTTPServer
import SocketServer
import os
import sys


def check_pid(pid):
  try:
    os.kill(pid, 0)
  except OSError:
    return False
  else:
    return True


class MyHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
  def do_GET(self):
    if 'quitquitquit' in self.path:
      sys.exit(0)
      return
    SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)


def main():
  server = SocketServer.TCPServer(('127.0.0.1', 0), MyHandler)
  server.timeout = 0.5
  ip, port = server.server_address

  if len(sys.argv) <= 1:
    print 'Usage: http_server /path/to/control/file'
    return 1

  filename = sys.argv[1]
  open(filename, 'w').write(str(port))

  while True:
    print 'http_server running...'
    server.handle_request()
    if 'quitquitquit' in open(filename).read():
      return 0
    ppid = os.getppid()
    if ppid == 1 or not check_pid(ppid):
      print 'parent process died.'
      return 2

if __name__ == '__main__':
  rv = main()
  print 'http_server exiting with code %d.' % rv
  exit(rv)