echoServer.py

#!/usr/bin/env python

"""
An echo server that uses threads to handle multiple clients at a time.
Entering any line of input at the terminal will exit the server.
"""

import select
import socket
import sys
import threading

class Server:
 def __init__(self):
 self.host = ''
 self.port = 50000
 self.backlog = 5
 self.size = 1024
 self.server = None
 self.threads = []

 def open_socket(self):
 try:
 self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 self.server.bind((self.host,self.port))
 self.server.listen(5)
 except socket.error, (value,message):
 if self.server:
 self.server.close()
 print "Could not open socket: " + message
 sys.exit(1)

 def run(self):
 self.open_socket()
 input = [self.server,sys.stdin]
 running = 1
 while running:
 inputready,outputready,exceptready = select.select(input,[],[])

 for s in inputready:

 if s == self.server:
 # handle the server socket
 c = Client(self.server.accept())
 c.start()
 self.threads.append(c)

 elif s == sys.stdin:
 # handle standard input
 junk = sys.stdin.readline()
 running = 0 

 # close all threads

 self.server.close()
 for c in self.threads:
 c.join()

class Client(threading.Thread):
 def __init__(self,(client,address)):
 threading.Thread.__init__(self)
 self.client = client
 self.address = address
 self.size = 1024

 def run(self):
 running = 1
 while running:
 data = self.client.recv(self.size)
 if data:
 self.client.send(data)
 else:
 self.client.close()
 running = 0

if __name__ == "__main__":
 s = Server()
 s.run()