server.py :  » Database » Python-Remote-Objects » Pyro-3.10 » examples » chatbox-non-ES » Python Open Source

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Python Open Source » Database » Python Remote Objects 
Python Remote Objects » Pyro 3.10 » examples » chatbox non ES » server.py
#!/usr/bin/env python

from threading import Thread
from Pyro.errors import NamingError
import Pyro.core, Pyro.naming, Pyro.util
import sys

CHAT_SERVER_GROUP = ":ChatBox"
CHAT_SERVER_NAME = CHAT_SERVER_GROUP+".Server"


# Chat box administration server.
# Handles logins, logouts, channels and nicknames, and the chatting.
class ChatBox(Pyro.core.ObjBase):
  def __init__(self):
    Pyro.core.ObjBase.__init__(self)
    self.channels={}    # registered channels { channel --> (nick, client callback) list }
    self.nicks=[]      # all registered nicks on this server
  def getChannels(self):
    return self.channels.keys()
  def getNicks(self):
    return self.nicks
  def join(self, channel, nick, callback):
    if nick in self.nicks:
      raise ValueError,'this nick is already in use'
    if not self.channels.has_key(channel):
      print 'CREATING NEW CHANNEL',channel
      self.channels[channel]=[]
    self.channels[channel].append((nick,callback))
    self.nicks.append(nick)
    callback._setOneway('message')  # don't wait for results for this method
    print nick,'JOINED',channel
    self.publish(channel,'SERVER','** '+nick+' joined **')
    nicks=[]
    for (n,c) in self.channels[channel]:
      nicks.append(n)
    return nicks
  def leave(self,channel,nick):
    if not self.channels.has_key(channel):
      print 'IGNORED UNKNOWN CHANNEL',channel
      return
    for (n,c) in self.channels[channel]:
      if n==nick:
        self.channels[channel].remove((n,c))
        break
    self.publish(channel,'SERVER','** '+nick+' left **')
    if len(self.channels[channel])<1:
      del self.channels[channel]
      print 'REMOVED CHANNEL',channel
    self.nicks.remove(nick)
    print nick,'LEFT',channel
  def publish(self, channel, nick, msg):
    # This must be performed in its own thread otherwise a thread deadlock may occur
    # when the publish is performed from within a call of a subscriber!
    Thread(target=self._do_publish, args=(channel, nick ,msg)).start()
  def _do_publish(self, channel, nick, msg):
    if not self.channels.has_key(channel):
      print 'IGNORED UNKNOWN CHANNEL',channel
      return
    for (n,c) in self.channels[channel][:]:    # use a copy of the list
      try:
        c.message(nick,msg)  # oneway call
      except Pyro.errors.ConnectionClosedError,x:
        # connection dropped, remove the listener if it's still there
        # check for existence because other thread may have killed it already
        if (n,c) in self.channels[channel]:
          self.channels[channel].remove((n,c))
          print 'Removed dead listener',n,c


def main():
  Pyro.core.initServer()
  daemon = Pyro.core.Daemon()
  ns = Pyro.naming.NameServerLocator().getNS()
  daemon.useNameServer(ns)

  # make sure our namespace group exists, and that our object name doesn't
  try:
    ns.createGroup(CHAT_SERVER_GROUP)
  except NamingError:
    pass
  try:
    ns.unregister(CHAT_SERVER_NAME)
  except NamingError:
    pass

  uri=daemon.connect(ChatBox(),CHAT_SERVER_NAME)

  # enter the service loop.
  print 'Chatbox open.'
  daemon.requestLoop()


if __name__=='__main__':
  main()

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