Python基础教程项目（5）虚拟茶话会

这是一个和网络编程有关系的项目，因为用到了scoket。整个项目用到了两个封装的类，以至于我们在用的时候不会太过关心SCOKET的实现细节，用起来各种方法和成员函数也更加的容易。

__author__ = 'phoenix'#coding:utf-8from asyncore import dispatcherfrom asynchat import async_chatimport socketimport asyncorePORT = 5005NAME = u'Sex  Chat Room'class EndSession(Exception):    passclass CommandHandler:    def unknow(self, session, cmd):        session.push('Unknown command: %s\r\n' % cmd)    def handle(self, session, line):        """        Main handle function        """        if not line.strip():            return        parts = line.split(' ', 1)        cmd = parts[0]        try:            line = parts[1].strip()        except IndexError:            line = ''        method = getattr(self, 'do_' + cmd, None)        try:            method(session, line)        except TypeError:            self.unknow(session, cmd)class Room(CommandHandler):    """    Z作为一个创建聊天室房间的基类    """    def __init__(self, server):        self.server = server        self.sessions = []    def add(self, session):        self.sessions.append(session)    def remove(self, session):        self.sessions.remove(session)    def broadcast(self, line):        for session in self.sessions:            session.push(line)    def do_logout(self, session, line):        raise EndSessionclass LoginRoom(Room):    """    z准备用户登录房间,但是不是正式的聊天室    """    def add(self, session):        Room.add(self, session)        self.broadcast('welcome to %s!\r\n' % self.server.name)    def unknow(self, session, cmd):        session.push('Please log in \n Use "login<nick>"\r\n')    def do_login(self, session, line):        name = line.strip()        if not name:            session.push("please enter your login name\r\n")        elif name in self.server.user:            session.push('the name "%s" is taken.\r\n' % name)            session.push('please try again.\r\n')        else:            session.name = name            session.enter(self.server.main_room)class ChatRoom(Room):    def add(self, session):        self.broadcast(session.name + 'has enterd the room.\r\n')        self.server.user[session.name] = session        Room.add(self,session)    def remove(self, session):        Room.remove(self, session)        self.broadcast(session.name + ' has left the room\r\n')    def do_say(self, session, line):        self.broadcast(session.name + ': ' + line + '\r\n')    def do_look(self, session, line):        session.push('the following are logged in \r\n')        for other in self.sessions:            session.push(other.name + '\r\n')    def do_who(self, session, line):        session.push('the following are logged in :\r\n')        for name in self.server.user:            session.push(name + '\r\n')class LogoutRoom(Room):    def add(self, session):        try:            del self.server.user[session.name]        except KeyError:            passclass ChatSession(async_chat):    """    这个类将会处理每一个客户端申请的会话，它将会所有新申请的客户端进入一个loginroom的房间内，    测试你的用户名以及进入聊天室的条件，    之后决定是否要客户端进入聊天室    """    def __init__(self, server, sock):        async_chat.__init__(self, sock)        self.server = server        self.set_terminator("\r\n")        self.data = []        self.name = None        self.enter(LoginRoom(server))    def enter(self, room):        """        将调用这个函数的客户端添加到登录房间里面        """        try:            cur = self.room        except AttributeError:            pass        else:            cur.remove(self)        self.room = room        room.add(self)    def collect_incoming_data(self, data):        self.data.append(data)    def found_terminator(self):        line = ''.join(self.data)        self.data = []        try:            self.room.handle(self, line)        except EndSession:            self.handle_close()    def handle_close(self):        async_chat.handle_close(self)        self.enter(LogoutRoom(self.server))class ChatServer(dispatcher):    """    创建聊天服务器主类    """    def __init__(self, port, name):        dispatcher.__init__(self)        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)     # 创建一个套接字        self.set_reuse_addr()                                      # 用于服务器信息的清理工作        self.bind(('', 5005))                                      # 将套接字绑定到指定的端口上准备监听        self.listen(5)        self.name = name        self.user = {}        self.main_room = ChatRoom(self)    def handle_accept(self):        """        this function will accept user connection, then handle this connection        """        conn, addr = self.accept()               #conn将存储客户端的套接字，addr将存储具体的Ip地址        ChatSession(self, conn)                  #conn作为参数，将把此次请求的客户端交给会话类的相关函数处理if __name__ == '__main__':    s = ChatServer(PORT, NAME)    try:        asyncore.loop()    except KeyboardInterrupt:        print