基于Socket的网络聊天室

from asyncore import dispatcher
from asynchat import async_chat
import socket, asyncore

PORT = 5005
NAME = "ChatRoom"

class EndSession(Exception):pass

class CommandHandler:
    def unknow(self, session, cmd):
        session.push('Unknow commans %s\r\n '% cmd)

    def handle(self, session, line):
        if not line.strip(): return
        parts = line.split(' ',1)
        cmd = parts[0]
        try:line = parts[1].strip()
        except IndexError :line = ' '

        meth = getattr(self, 'do_'+cmd, None)

        try:
            meth(session, line)
        except TypeError:
            self.unknow(session, cmd)

class Room(CommandHandler):

    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 EndSession

class LoginRoom(Room):
    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 \nuse "login <nick>"\r\n')

    def do_login(self, session, line):
        name = line.strip()
        if not name:
            session.push('please enter a name\r\n')
        elif name in self.server.users:
            session.push('The name "%s" is taken.\r\n' % name)
            session.push('Please try again')
        else:
            session.name = name
            session.enter(self.server.main_room)

class ChatRoom(Room):
    def add(self,session):
        self.broadcast(session.name + ' has entered the room\r\n')
        self.server.users[session.name] = session
        Room.add(self, session)
    def remove(self, session):
        Room.remove(self, session)
        self.broadcast(session.name + ' has left the room')
    def do_say(self, session, line):
        self.broadcast(session.name+': ' + line + '\r\n')

    def do_look(self, session, line):
        session.push('The following are in room:\r\n')
        for other in self.sessions:
            session.push(other.name + ' \r\n')
    def do_who(self,session, line):
        session.push('The Following are loffed in: \r\n')
        for name in self.server.users:
            session.push(name + '\r\n')
class LogoutRoom(Room):
    def add(self,session):
        try:del self.server.users[session.name]
        except KeyError:pass

class ChatSession(async_chat):
    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):
        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(LoginRoom(self.server))

class ChatServer(dispatcher):
    def __init__(self,port ,name):
        dispatcher.__init__(self)
        self.create_socket(socket.AF_INET,socket.SOCK_STREAM)
        self.set_reuse_addr()
        self.bind(('',port))
        self.listen(5)
        self.name = name
        self.users ={}
        self.main_room = ChatRoom(self)

    def handle_accept(self):
        conn, addr = self.accept()
        ChatSession(self, conn)

if __name__ == '__main__':
    s = ChatServer(PORT,NAME)
    try:asyncore.loop()
    except KeyboardInterrupt: print