class ClientHandler:
LOGIN_MSG = 'Choose a nickname.'
HELLO_MSG = 'You are in, {}!'
NICK_TAKEN_MSG = 'Nickname {} is taken, choose another one.'
SHUTDOWN_MSG = 'Server shut down and you were disconnected.'
def __init__(self, sock, addr, server):
self.server = server
self.conn = Connection(sock, addr)
self.inbox = Queue(maxsize=MAX_CLIENT_QUEUE)
self.nickname = None
self.channel = None
@property
def addr(self):
return self.conn.addr
def init(self):
try:
self.conn.send_msg(self.LOGIN_MSG)
while True:
try:
nickname = self.conn.recv_msg()
self.server.register_client(nickname, self)
self.server.addr_client[self.addr] = self
self.nickname = nickname
self.conn.send_msg(self.HELLO_MSG.format(nickname))
break
except NickTakenError:
self.conn.send_msg(self.NICK_TAKEN_MSG.format(nickname))
except OSError:
self.shutdown()
# Connection fully established.
self.server.subscribe(self.nickname, 'default')
self.channel = self.server.channels['default']
self.in_channel()
def shutdown(self):
try:
self.conn.send_msg(self.SHUTDOWN_MSG)
self.conn.close()
except OSError:
pass # yeah, really
self.channel.unsub(self.nickname)
self.server.remove_client(self.nickname)
def in_channel(self):
receiver = threading.Thread(target=self.process_inbox, daemon=True)
receiver.start()
try:
while True:
msg = self.conn.recv_msg()
msg = '{}: {}'.format(self.nickname, msg)
self.channel.publish(('tcp', msg), self.nickname)
except ConnectionError:
self.shutdown()
def process_inbox(self):
try:
while True:
kin, msg = self.inbox.get()
if kin == 'udp':
send_udp(msg, self.addr)
else:
self.conn.send_msg(msg)
except ConnectionError:
self.shutdown()
def push(self, msg):
self.inbox.put(msg)
def handle_udp(self, msg):
self.channel.publish(('udp', msg), self.nickname)
class Client:
def __init__(self, server_host='127.0.0.1', server_port=8000, client_host='127.0.0.1', client_port=8001):
self.server_addr = (server_host, server_port)
self.client_addr = (client_host, client_port)
self.conn = None
def run(self):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(self.client_addr)
s.connect(self.server_addr)
self.conn = Connection(s, self.server_addr)
receiver = threading.Thread(target=self.receive, daemon=True)
receiver.start()
udp_receiver = threading.Thread(target=self.receive_udp, daemon=True)
udp_receiver.start()
try:
while True:
msg = input()
if msg == 'U' or msg == 'M':
with open('ascii.txt', 'r', encoding='ascii') as ascii_art:
content = ascii_art.read()
if msg == 'U':
addr = self.server_addr
else:
addr = MULTICAST_ADDR
send_udp(content, addr, self.client_addr)
else:
self.conn.send_msg(msg)
except KeyboardInterrupt:
print('Received Ctrl+C.')
except ConnectionError:
print('Connection to server closed.')
def receive(self):
try:
while True:
msg = self.conn.recv_msg()
print('>>> {}'.format(msg))
except ConnectionError:
self.conn.close()
def receive_udp(self):
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as u_sock:
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as m_sock:
u_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
u_sock.bind(self.client_addr)
host = socket.gethostbyname(socket.gethostname())
m_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
m_sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP,
socket.inet_aton(MULTICAST_ADDR[0]) + socket.inet_aton(host))
m_sock.bind(MULTICAST_ADDR)
ev_loop = select.epoll()
u_fd, m_fd = u_sock.fileno(), m_sock.fileno()
ev_loop.register(u_fd, select.EPOLLIN)
ev_loop.register(m_fd, select.EPOLLIN)
try:
while True:
events = ev_loop.poll()
for file_no, event in events:
if event | select.EPOLLIN:
if file_no == u_fd:
msg = u_sock.recv(MAX_UDP_SIZE)
else:
msg, addr = m_sock.recvfrom(MAX_UDP_SIZE)
if addr == self.client_addr:
continue
print(msg.decode())
except ConnectionError:
self.conn.close()