socket server.py

import socket
import select

HEADER_LENGTH = 10
IP = "127.0.0.1"
PORT = 1234

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

server_socket.bind((IP, PORT))

server_socket.listen()

sockets_list = [server_socket]

clients = {}

print(f'Listening for connections on {IP}:{PORT}...')
def recieve_messages(client_socket):
    try:
        message_header = client_socket.recv(HEADER_LENGTH)

        if not len(message_header):
            return False

        message_length = int(message_header.decode('utf-8').strip())
        return {"header": message_header, "data": client_socket.recv(message_length)}

    except:
        return False

while True:
    read_sockets, _, exception_sockets = select.select(sockets_list, [], sockets_list)

    for notified_socket in read_sockets:
        if notified_socket == server_socket:
            client_socket, client_address = server_socket.accept()

            user = recieve_messages(client_socket)
            if user is False:
                continue

            sockets_list.append(client_socket)

            clients[client_socket] = user

            print('Accepted new connection from {}:{}, username: {}'.format(client_address[0], client_address[1], user["data"].decode("utf-8")))
        else:
            message = recieve_messages(notified_socket)

            if message is False:
                print(f'Closed connection from {clients[notified_socket]["data"].decode("utf-8")}')
                sockets_list.remove(notified_socket)
                del clients[notified_socket]
                continue

            user = clients[notified_socket]
            print(f'Recieved message from {user["data"].decode("utf-8")}: {message["data"].decode("utf-8")}')

            for client_socket in clients:
                if client_socket != notified_socket:
                    client_socket.send(user['header'] + user['data'] + message['header'] + message['data'])

        for notified_socket in exception_sockets:
            sockets_list.remove(notified_socket)
            del clients[notified_socket]