QND_secure_chat/server.py

import threading
import socket

host = "127.0.0.1"
port = 9999

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((host, port))
server.listen()
clients = []
aliases = []

def broadcast(message):
	for client in clients:
		client.send(message)
def handle_client(client):
	while True:
		try:
			message = client.recv(1024)
			broadcast(message)
		except:
			index = clients.index(client)
			client.close()
			alias = aliases[index]
			broadcast(f'{alias} has left the chat room!'.encode('utf-8'))
			aliases.remove(alias)
			break

def receive():
	while True:
		print("server is running and listening")
		client, address = server.accept()
		print(f'connection is established with {(address)}')
		client.send('alias?'.encode('utf-8'))
		alias = client.recv(1024)
		aliases.append(alias)
		clients.append(client)
		print(f'The alias of this client is {alias}'.encode('utf-8'))
		broadcast(f'{alias} has connected to the chat room'.encode('utf-8'))
		client.send("you are connected!".encode('utf-8'))
		thread = threading.Thread(target = handle_client, args=(client,))
		thread.start()
if __name__ == "__main__":
	receive()