研究python服务器开发

import socket, threading

HOST = ‘127.0.0.1‘
PORT = 51234 

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(4)
clients = [] #list of clients connected
lock = threading.Lock()


class chatServer(threading.Thread):
    def __init__(self, (socket,address)):
        threading.Thread.__init__(self)
        self.socket = socket
        self.address= address

    def run(self):
        lock.acquire()
        clients.append(self)
        lock.release()
        print ‘%s:%s connected.‘ % self.address
        while True:
            data = self.socket.recv(1024)
            if not data:
                break
            for c in clients:
                c.socket.send(data)
        self.socket.close()
        print ‘%s:%s disconnected.‘ % self.address
        lock.acquire()
        clients.remove(self)
        lock.release()

while True: # wait for socket to connect
    # send socket to chatserver and start monitoring
    chatServer(s.accept()).start()

#!/usr/bin/python

import socket

def resolve(name):
    if name == "mpapp.nobies.in":
        return "172.16.45.84"
    else :
        # you ought to add some basic checking of name here
        return socket.gethostbyname(name)

host = ‘‘
port = 50000
backlog = 5
size = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host,port))
s.listen(backlog)
while 1:
    client, address = s.accept()
    data = client.recv(size)
    if data:
        bits = data.split(":")
        if bits[0] == ‘h‘:
            client.send(resolve(bits[1]))
    client.close()

#!/usr/bin/python

import socket

### configure me ###

dns_server_ip = ‘127.0.0.1‘
dns_server_port = 50000
query = ‘mpapp.nobies.in‘ # change this to the hostname you want to lookup

### configure me ###

size = 1024

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((dns_server_ip,dns_server_port))
s.send(‘h:‘ + query)
data = s.recv(size)
s.close()
print data