一个小聊天室的代码运行总是报错
# coding=gbk
'''
Created on 2012-5-22
@author: dengjian
'''
from asyncore import dispatcher
from asynchat import async_chat
import socket,asyncore
PORT= 5005
NAME='TestChat'
class EndSession(Exception): pass
class CommandHandler:
"""
类似于标准库cmd.Cmd的简单命令处理程序。
"""
def unknown(self,session,cmd):
#'响应未知命令'
session.push('Unknown command: %s\r\n' % cmd)
def handle(self,session,line):
#'处理从给定的会话中接收到的行'
if not line.strip(): return
#分离命令
parts=line.split(' ',1)
cmd=parts[0]
try : line=parts[1].strip()
except IndexError: line=''
#试着查找处理程序：
meth=getattr(self,'do_'+cmd,None)
try:
#假如它是可调用的
meth(session,line)
except TypeError:
# 如果不可以被调用，此段代码响应未知的命令：
self.unknown(session,cmd)
class Room(CommandHandler):
"""
包括一个或多个用户（会话）的泛型环境。它负责基本的命令处理和广播。
"""
def __init__(self,server):
self.server=server
self.sessions=[]
def add(self,session):
#'一个会话（用户）已进入房间'
self.sessions.append(session)
def remove(self,session):
#'一个会话（用户）已离开房间'
self.sessions.remove(session)
def broadcast(self,line):
#'向房间中的所有会话发送一行'
for session in self.sessions:
session.push(line)
def do_logout(self,session,line):
#'响应logout命令'
raise EndSession
class LoginRoom(Room):
"""
为刚刚连接上的用户准备的房间。
"""
def add(self,session):
Room.add(self, session)
#当用户进入时，问题他或她：
self.broadcast('welcome to %s\r\n' % self.server.name)
def unknown(self,session,cmd):
#所有未知命令（除了login或者logout外一切）
#会导致一个警告
session.push('Please log in \n Use "login <nick> "\r\n')
def do_login(self,session,line):
name=line.strip()
#确保用户输入了名字
if not name:
session.push('Please enter a name\r\n')
#确保用户名没有被利用：
elif name in self.server.users:
session.push('The name "%s" is taken.\r\n' % name)
session.push('Please try again.\r\n')
else:
#名字没问题，所以存储在会话中，并且
#将用户移动到主聊天室。
session.name=name
session.enter(self.server.main_room)
class ChatRoom(Room):
"""
为多用户相互聊天准备的房间
"""
def add(self,session):
#告诉所有人有新用户进入
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)
#告诉所有人有用户离开：
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):
#'处理look命令，该命令用于查看谁在房间内'
session.push('The following are in this room:\r\n')
for other in self.sessions:
session.push(other.name + '\r\n')
def do_who(self,session,line):
#'处理who命令，该命令用于查看谁登录了'
session.push('The following are logged in:\r\n')
for name in self.server.users:
session.push(name + '\r\n')
class LogoutRoom(Room):
"""
为单用户准备的简单房间，只用于将用户名从服务器移除。
"""
def add(self,session):
#当会话（用户）进入要删除的logoutRomm时
try: del self.server.users[session.name]
except KeyError: pass
class ChatSession(async_chat):
"""
单会话，负责和单用户通信
"""
def __init__(self,server,sock):
async_chat.__init__(self, sock)
self.server=server
self.set_terminator("\r\n")
self.data=[]
self.name=None
#所有的会话都开始于单独的LoginRoom中：
self.enter(LoginRoom(server))
def enter(self,room):
#从当前房间移除自身(self)，并且将自身添加到
#下一个房间
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):
"""
只有一个房间的聊天服务器。
"""
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
刚运行时不会报错，但是输入：login 用户名，就会有以下的错误
Traceback (most recent call last):
File "/home/dengjian/workspace/code24/chatserver.py", line 193, in <module>
try: asyncore.loop()
File "/usr/lib/python2.7/asyncore.py", line 210, in loop
error: uncaptured python exception, closing channel <__main__.ChatSession connected 127.0.0.1:37790 at 0xb707ecec> (<type 'exceptions.AttributeError'>:ChatRoom instance has no attribute 'session' [/usr/lib/python2.7/asyncore.py|read|79] [/usr/lib/python2.7/asyncore.py|handle_read_event|438] [/usr/lib/python2.7/asynchat.py|handle_read|158] [/home/dengjian/workspace/code24/chatserver.py|found_terminator|165] [/home/dengjian/workspace/code24/chatserver.py|handle|37] [/home/dengjian/workspace/code24/chatserver.py|do_login|94] [/home/dengjian/workspace/code24/chatserver.py|enter|156] [/home/dengjian/workspace/code24/chatserver.py|add|105])
poll_fun(timeout, map)
File "/usr/lib/python2.7/asyncore.py", line 151, in poll
read(obj)
File "/usr/lib/python2.7/asyncore.py", line 83, in read
obj.handle_error()
File "/usr/lib/python2.7/asyncore.py", line 495, in handle_error
self.handle_close()
File "/home/dengjian/workspace/code24/chatserver.py", line 171, in handle_close
self.enter(LogoutRoom(self.server))
File "/home/dengjian/workspace/code24/chatserver.py", line 154, in enter
else: cur.remove(self)
File "/home/dengjian/workspace/code24/chatserver.py", line 108, in remove
Room.remove(self, session)
File "/home/dengjian/workspace/code24/chatserver.py", line 56, in remove
self.sessions.remove(session)
ValueError: list.remove(x): x not in list
查了几天了，都没有找到问题，求大牛帮助
[解决办法]
错误信息说的很清楚：
enter函数中调用了： cur.remove(self)，进而调用了Room.remove，最后调用了self.session.remove.但是刚开始是，该用户并不在当前房间中。所以remove出错了。remove之前要先检查用户是否在self.session中。
[解决办法]
呵呵，不好意思，看错啦，刚睡醒...