tornado做简单socket服务器（TCP）

http://blog.csdn.net/chenggong2dm/article/details/9041181

服务器端代码如下：

#! /usr/bin/env python
#coding=utf-8

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('
', 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()

经测试后发现，tornado的接收方法里，已经做了粘包处理。比如第18行的代码，就是用的tornado.iostream.BaseIOStream类的read_until(delimiter, callback) 方法。这个方法，将会从缓冲区里，直到读到截止标记（比如' '），就产生一次回调。如果没有截止标记，缓冲区就攒数据，直到等到截止标记出现，才会产生回调。看了一下源码，缓冲区默认是max_buffer_size=104857600 。

下面是客户端代码：

#! /usr/bin/env python
#coding=utf-8

import socket
import time

HOST = '127.0.0.1'    # The remote host
PORT = 8000           # The same port as used by the server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))

s.sendall('Hello, 
w')
time.sleep(5)
s.sendall('ord! 
')

data = s.recv(1024)

print 'Received', repr(data)

time.sleep(60)
s.close()

运行后，可以看到，服务器端，会打出：

Hello,

word！