python实现组播通讯

python3标准库中提供了socketserver库来提供快速的TCP和UDP服务的实现，在工做中接触到了组播的问题，为了方便的测试业务，经过继承UDPServer类，并override了server_bind方法，实现了一个能够快速搭建组播服务的类，经过建立一个MulticastServer实例就能够进行组播通讯了

import socket
from socketserver import UDPServer, DatagramRequestHandler

MCASTADDR = '225.12.3.1'
PORT = 3232
INTERFACE = '192.168.10.11'

class MulticastHandler(DatagramRequestHandler):
    def handle(self):
        print('get a multicast message:',self.rfile.readline())

class MulticastServer(UDPServer):
    """
    Multicast UDP server class
    """
    allow_reuse_address = True
    multicast_loop = True
    def __init__(self, interface, server_address, RequestHandlerClass, ttl=1, bind_and_activate=True):
        """Constructor.  May be extended, do not override."""
        self.interface = interface
        self.ttl = ttl
        UDPServer.__init__(self, server_address, RequestHandlerClass, bind_and_activate)

    def server_bind(self):
        if self.allow_reuse_address:
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        #self.socket.bind((interface,server_address[1])) # for windows we need use this type
        self.socket.bind(self.server_address)
        if self.multicast_loop:
            self.socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_LOOP, 1) # set the socket option: allow the packet recieved by localhost
        self.socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, \
            socket.inet_aton(self.server_address[0])+socket.inet_aton(self.interface)) # set the socket option: IP_ADD_MEMBERSHIP to join the group
        if self.ttl != 1:
            self.socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, self.ttl) # set the socket option: IP_MULTICAST_TTL
        self.server_address = self.socket.getsockname()




def main():
    multiserver=MulticastServer(INTERFACE, (MCASTADDR,PORT), MulticastHandler)
    multiserver.serve_forever()

if __name__ == '__main__':
    main()

发送端的代码能够参考：http://blog.csdn.net/ztb3214/article/details/19285363

 

注意：DatagramRequestHandler的在收到消息后会调用finish方法，finish方法会默认向客户端发送一个长度为0的udp报文，若是不想发送这个报文，须要重写finish方法

PS: windows下和linux下进行bind的时候bind的参数不太一致，linux下bind的是组播地址，windows下bind的本机的IP地址，为何出现这样的不一致还没弄清楚，有了解的大神请不吝赐教