#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
	demeter tcp
	name:server.py
	author:rabin
"""
from tornado.tcpserver import TCPServer
from tornado.ioloop  import IOLoop

class Connection(object):	
	clients = set()	
	def __init__(self, stream, address):   
		Connection.clients.add(self)   
		self._stream = stream	
		self._address = address	
		self._stream.set_close_callback(self.on_close)	
		self.read_message()	
		print "A new user has entered the chat room.", address   
		
	def read_message(self):	
		self._stream.read_until('\n', self.broadcast_messages)	
	
	def broadcast_messages(self, data):	
		print "User said:", data[:-1], self._address  
		for conn in Connection.clients:	
			conn.send_message(data)	
		self.read_message()	
		
	def send_message(self, data):	
		self._stream.write(data)   
			
	def on_close(self):	
		print "A user has left the chat room.", self._address  
		Connection.clients.remove(self)
	
class ChatServer(TCPServer):	
	def handle_stream(self, stream, address):   
		print "New connection :", address, stream   
		Connection(stream, address)   
		print "connection num is:", len(Connection.clients)  
	
if __name__ == '__main__':	
	print "Server start ......"	
	server = ChatServer()
	server.listen(8000)
	IOLoop.instance().start()