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client.py
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client.py
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import gevent
import gevent.socket
import socket
import sys
from datetime import datetime
from urwid_geventloop import GeventLoop
from urwid import (ListBox, SimpleFocusListWalker, Frame, MainLoop, Edit, Text,
ExitMainLoop)
class ChatMessages(ListBox):
""" Show the last couple of chat messages as a scrolling list """
def __init__(self, chat):
self.chat = chat
self.walker = SimpleFocusListWalker([])
super(ChatMessages, self).__init__(self.walker)
def add(self, message):
self.walker.append(Text(message))
self.set_focus(len(self.walker)-1)
class ChatInput(Edit):
""" Where the user types a message or commands """
def __init__(self, chat):
self.chat = chat
super(ChatInput, self).__init__(caption='> ')
def keypress(self, size, key):
message = self.get_edit_text()
if key == 'enter':
if message == '':
return
if message[0] == '/':
self.chat.user_command(message[1:])
else:
self.chat.write_message(self.chat.nickname, message)
self.chat.send_message(message)
self.set_edit_text('')
super(ChatInput, self).keypress(size, key)
class Connection(object):
HANDSHAKE_INIT = 'HELO'
HANDSHAKE_RESPONSE = 'OHAI'
STATE_CONNECTING = 0
STATE_CONNECTED = 1
STATE_DISCONNECTED = 2
RECORD_SEPARATOR = '\x1e'
SERVER = 'localhost'
PORT = 9000
def __init__(self, chat):
self.state = self.STATE_CONNECTING
self.chat = chat
self.socket = gevent.socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
def handle(self, message):
if message[0] == self.HANDSHAKE_RESPONSE:
self.state = self.STATE_CONNECTED
self.chat.connected()
elif message[0] == 'MSG':
_, nickname, message = message
self.chat.write_message(nickname, message)
else:
self.chat.write("Unknown data received: %r" % message)
def parse_message(self, data):
return data.split(self.RECORD_SEPARATOR)
def connected(self):
return self.state == self.STATE_CONNECTED
def open(self):
self.socket.sendto(self.HANDSHAKE_INIT, (self.SERVER, self.PORT))
while True:
data = []
while True:
datagram = self.socket.recv(256)
if data != '':
data.append(datagram)
if datagram == '' or datagram[-1] == '\x00':
break
self.handle(self.parse_message(''.join(data)[:-1]))
def send(self, *args):
payload = self.RECORD_SEPARATOR.join(args) + '\x00'
self.socket.sendto(payload, (self.SERVER, self.PORT))
class Chat(object):
""" The main chat class. Connects the GUI pieces together. """
def __init__(self, nickname):
self.nickname = nickname
self.output = ChatMessages(self)
self.message = ChatInput(self)
self.window = Frame(
body=self.output,
footer=self.message,
focus_part='footer'
)
self.main_loop = None
self.connection = Connection(self)
def connected(self):
self.write_status('Connected')
def send_message(self, message):
self.connection.send('MSG', self.nickname, message)
def write(self, message):
self.output.add(message)
def write_message(self, nickname, message):
self.write("%s <%s> %s" % (self.time(), nickname, message))
def write_status(self, message):
self.write("*** %s ***" % message)
def time(self, date=False):
format_string = '%X'
if date:
format_string = '%c'
return datetime.now().strftime(format_string).strip()
def user_command(self, command):
arguments = command.split(' ')
command = arguments.pop(0)
def _require_args(args, n):
if len(args) < n:
self.write("%s needs %d argument(s), %d given" %
(command, n, len(args)))
return False
return True
def _quit():
raise ExitMainLoop()
def _unknown():
self.write('Unknown command %r' % command)
def _nickname(new_nickname):
self.nickname = new_nickname
self.write_status('Nickname changed to %r' % new_nickname)
command_map = {
'quit': (_quit, 0),
'nickname': (_nickname, 1)
}
command, args_needed = command_map.get(command, (_unknown, 0))
if _require_args(arguments, args_needed):
command(*arguments)
def connect(self):
self.write_status('Connecting')
self.connection.open()
def run(self):
""" Start the chat client """
self.write_status("Chat started at %s" % self.time(date=True))
self.main_loop = MainLoop(self.window, event_loop=GeventLoop())
gevent.spawn(self.connect)
self.main_loop.run()
if __name__ == '__main__':
nickname = "Anonymous"
if len(sys.argv) > 1:
nickname = sys.argv[1]
chat = Chat(nickname)
try:
chat.run()
except KeyboardInterrupt:
chat.main_loop.stop()