IsClientConnected

Sometimes it may be useful to continue processing the request only if client is still connected.

Example:
Enter server address in the browser. Within 20 seconds, close the browser window. In CherryPy server log you should see info about that.

The function isClientConnected tested on Windows Server only.

{{{
import time
import logging

import cherrypy

def isClientConnected(asock=None):
   if asock is None:
      asock=cherrypy.request.rfile.rfile._sock
   ret=0
   atimeout=asock.gettimeout()
   try:
      asock.settimeout(0.001)
      try:
         adata=asock.recv(0)
      except:
         ret=1
   finally:
      asock.settimeout(atimeout)
   return ret

class Test:
   rcnt=0
   @cherrypy.expose
   def index(self):
      self.rcnt=self.rcnt+1
      acnt=self.rcnt
      for i in range(20):
         time.sleep(1)
         if isClientConnected():
            cherrypy.log('timer: %d - %d'%(acnt,i),context='',severity=logging.DEBUG,traceback=False)
         else:
            cherrypy.log('timer: %d - disconnected'%(acnt,),context='',severity=logging.DEBUG,traceback=False)
            return 'Disconnected - no need to wait more...'
      return 'OK'

if __name__ == '__main__':
   cherrypy.config.update({
      'server.socket_host':'0.0.0.0',
      'server.socket_port':9092,
   })
   cherrypy.quickstart(Test())
}}}