win32 service and sockets

[Tom Brown]

Hi,

I created a win32 service for XPPro called N4010ATestService.py (see below). 
The service runs as a particular user with administrative rights. It starts a 
thread that creates a simple socket server (N4010ASocketServer.py -- also 
below) that just waits for 20 character string. When I run the socket server 
by itself the test client can connect to the server and send a 20 character 
string just fine. When I run the service, the server will bind to the port 
but the client cannot connect. I verified the server was listening on the 
given port using netstat -an. The client eventually times out. Why isn't the 
server accepting connections when run in a service?

Thanks,
Tom

N4010ATestService.py:
---------------------
import win32serviceutil
import win32service
import win32event
import N4010ASocketServer
from thread import start_new_thread

class N4010ATestService(win32serviceutil.ServiceFramework):
  _svc_name_ = "N4010ATestService"
  _svc_display_name_ = "N4010A Test Service"
  def __init__(self, args):
    win32serviceutil.ServiceFramework.__init__(self, args)

  def SvcDoRun(self):
     start_new_thread(N4010ASocketServer.main, ())
     N4010ASocketServer.waitfor()

  def SvcStop(self):
    # Before we do anything, tell the SCM we are starting the stop process.
    self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
    N4010ASocketServer.stop()

if __name__ == '__main__':
  win32serviceutil.HandleCommandLine(N4010ATestService)


N4010ASocketServer.py:
----------------------
from socket import socket
from select import select
from time import sleep
import win32evtlogutil

applicationName = 'N4010ASocketServer'
messageDll = 'C:\Python24\Lib\site-packages\win32\pythonservice.exe'
running = True
stopped = False

def registerWithEventViewer():
  win32evtlogutil.AddSourceToRegistry(applicationName, messageDll)

def stop():
  import servicemanager
  servicemanager.LogInfoMsg('stopping')
  global running
  running = False

def waitfor():
  while not stopped:
    sleep(0.5)

def main():
  import servicemanager
  registerWithEventViewer()
  servicemanager.LogInfoMsg('creating socket')
  sock = socket()
  servicemanager.LogInfoMsg('binding to port 48777')
  sock.bind(('0.0.0.0', 48777))
  servicemanager.LogInfoMsg('listening')
  sock.listen(5)
  while running:
    servicemanager.LogInfoMsg('Waiting for connection.')
    readyRead, readyWrite, inerror = select([sock], [], [], 0)
    while (not readyRead) and running:
      sleep(0.5)
      readyRead, readyWrite, inerror = select([sock], [], [], 0)
    if running:
      conn, address = sock.accept()
      msg = conn.recv(20)
      servicemanager.LogInfoMsg('Recvd msg: %s' % msg)
      conn.close()
  global stopped
  stopped = True