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listing24-6.py
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202 lines (165 loc) · 5.76 KB
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from asyncore import dispatcher
from asynchat import async_chat
import socket, asyncore
PORT = 5005
NAME = 'TestChat'
class EndSession(Exception): pass
class CommandHandler:
"""
Simple command handler similar to cmd.Cmd from the standard
library.
"""
def unknown(self, session, cmd):
'Respond to an unknown command'
session.push('Unknown command: %s\r\n' % cmd)
def handle(self, session, line):
'Handle a received line from a given session'
if not line.strip(): return
# Split off the command:
parts = line.split(' ', 1)
cmd = parts[0]
try: line = parts[1].strip()
except IndexError: line = ''
# Try to find a handler:
meth = getattr(self, 'do_'+cmd, None)
try:
# Assume it's callable:
meth(session, line)
except TypeError:
# If it isn't, respond to the unknown command:
self.unknown(session, cmd)
class Room(CommandHandler):
"""
A generic environment that may contain one or more users
(sessions). It takes care of basic command handling and
broadcasting.
"""
def __init__(self, server):
self.server = server
self.sessions = []
def add(self, session):
'A session (user) has entered the room'
self.sessions.append(session)
def remove(self, session):
'A session (user) has left the room'
self.sessions.remove(session)
def broadcast(self, line):
'Send a line to all sessions in the room'
for session in self.sessions:
session.push(line)
def do_logout(self, session, line):
'Respond to the logout command'
raise EndSession
class LoginRoom(Room):
"""
A room meant for a single person who has just connected.
"""
def add(self, session):
Room.add(self, session)
# When a user enters, greet him/her:
self.broadcast('Welcome to %s\r\n' % self.server.name)
def unknown(self, session, cmd):
# All unknown commands (anything except login or logout)
# results in a prodding:
session.push('Please log in\nUse "login <nick>"\r\n')
def do_login(self, session, line):
name = line.strip()
# Make sure the user has entered a name:
if not name:
session.push('Please enter a name\r\n')
# Make sure that the name isn't in use:
elif name in self.server.users:
session.push('The name "%s" is taken.\r\n' % name)
session.push('Please try again.\r\n')
else:
# The name is OK, so it is stored in the session, and
# the user is moved into the main room.
session.name = name
session.enter(self.server.main_room)
class ChatRoom(Room):
"""
A room meant for multiple users who can chat with the others in
the room.
"""
def add(self, session):
# Notify everyone that a new user has entered:
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)
# Notify everyone that a user has left:
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):
'Handles the look command, used to see who is in a room'
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):
'Handles the who command, used to see who is logged in'
session.push('The following are logged in:\r\n')
for name in self.server.users:
session.push(name + '\r\n')
class LogoutRoom(Room):
"""
A simple room for a single user. Its sole purpose is to remove
the user's name from the server.
"""
def add(self, session):
# When a session (user) enters the LogoutRoom it is deleted
try: del self.server.users[session.name]
except KeyError: pass
class ChatSession(async_chat):
"""
A single session, which takes care of the communication with a
single user.
"""
def __init__(self, server, sock):
async_chat.__init__(self, sock)
self.server = server
self.set_terminator("\r\n")
self.data = []
self.name = None
# All sessions begin in a separate LoginRoom:
self.enter(LoginRoom(server))
def enter(self, room):
# Remove self from current room and add self to
# next 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(LogoutRoom(self.server))
class ChatServer(dispatcher):
"""
A chat server with a single room.
"""
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