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server.py
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server.py
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import re
from collections import namedtuple
import socket
import socketserver
User = namedtuple('User', 'sock name')
user_map = {}
def isascii(data):
return all(b <= 0x7f for b in data)
def register_user(name, sock):
sock_id = id(sock)
user_map[sock_id] = User(sock=sock, name=name)
def publish(msg):
for user in user_map.values():
send(user.sock, msg)
def send(sock, msg):
sock.wfile.write((msg + "\n").encode('ascii'))
def broadcast_others(source, msg):
for user in user_map.values():
if user.sock != source:
send(user.sock, msg)
def unregister_user(sock):
sock_id = id(sock)
del user_map[sock_id]
class Handler(socketserver.StreamRequestHandler):
def handle(self):
# state: new user, not joined
name = None
try:
name = self.handle_new_user()
except:
import traceback
traceback.print_exc()
if name is None:
try:
self.request.close()
except:
pass
return
# state: user joined
print("Accept user", name)
publish("* " + name + " has joined")
send(self, "* Users online: " + ', '.join([u.name for u in user_map.values()]))
register_user(name, self)
try:
self.joined_handler(name)
except:
import traceback
traceback.print_exc()
finally:
print("Disconnect user", name)
unregister_user(self)
publish("* " + name + " has left")
try:
self.request.close()
except:
pass
def handle_new_user(self):
send(self, "Welcome. Please enter a name: ")
name_bin = self.rfile.readline().strip()
print("Recv name", name_bin)
if not name_bin or not isascii(name_bin):
send(self, "Illegal name")
return None
name = name_bin.decode('ascii')
if not re.match('^[a-zA-Z0-9]+$', name):
send(self, "Illegal name")
return None
return name
def joined_handler(self, name):
for message_bin in self.rfile:
message_bin = message_bin.strip()
if not isascii(message_bin):
print("Non-ascii from", name)
return
message = message_bin.decode('ascii')
broadcast_others(self, "[" + name + "] " + message)
class Server(socketserver.ThreadingTCPServer):
allow_reuse_address = True
server = Server(('0.0.0.0', 9999), Handler)
server.serve_forever()