Why this Python3 chat fails after a few messages? - python-3.x

Question

That's what happens: After the client sends some messages, it gives ConnectionAbortedError: [WinError 10053] and the server keeps running
Images:
server socket:
client socket:
Here's my server code:
from socket import *
def server(address, port):
sock = socket(AF_INET, SOCK_STREAM)
sock.bind((address, port))
sock.listen(10)
while True:
clientsock, addr = sock.accept()
ip, _ = addr
msg = input('YOU: ')
clientsock.send(bytes(msg, 'utf-8'))
data = clientsock.recv(2048)
print('%s - ' % ip, data.decode('utf-8'))
if not data:
break
clientsock.shutdown(SHUT_WR)
clientsock.close()
sock.close()
if __name__ == '__main__':
server('192.168.0.101', 5000)
Client:
from socket import *
def client(address, port):
sock = socket(AF_INET, SOCK_STREAM)
sock.connect((address, port)) #0.0.0.0 isnt valid
while True:
data = sock.recv(2048)
print('%s - ' % address, data.decode('utf-8'))
msg = input('YOU: ')
sock.send(bytes(msg, 'utf-8'))
sock.close()
if __name__ == '__main__':
client('192.168.0.101', 5000)

Answer 1

Server in each loop accept new client sends one message receive one message and disconnect client. Then it waits for another client.
You need another loop for handling client.
That another loop could be placed in another thread.
If you nest that loop in this loop, you will be able to handle just one client at the time. I modified your server like that:
def server(address, port):
sock = socket(AF_INET, SOCK_STREAM)
sock.bind((address, port))
sock.listen(10)
while True: # server loop
clientsock, addr = sock.accept()
ip, _ = addr
msg = "Hello to client from %s" % ip
# next line is here because your client need message from server to send message
clientsock.send(bytes(msg, 'utf-8'))
while True: # client loop
data = clientsock.recv(2048)
msg = '%s - %s' % (ip, data.decode('utf-8'))
print(msg)
if not data:
break
clientsock.send(bytes(msg, 'utf-8')) # for multiple clients you need send msg to all
clientsock.shutdown(SHUT_WR)
clientsock.close()
sock.close()
To handle multiple clients you do not want to block server loop until client loop ends. You could run client loop in another thread and continue waiting for next client clientsock, addr = sock.accept().
Similarly you might want to separate receiving messages from server and waiting for client input.