Server Side

server.py

mport struct
import socket
from threading import Thread
from rich import print

print('\n'*100)

# server's IP address
SERVER_HOST = "0.0.0.0"
SERVER_PORT = 5002 # port we want to use
separator_token = "<SEP>" # we will use this to separate the client name & message

# initialize list/set of all connected client's sockets
client_sockets = set()
# create a TCP socket
s = socket.socket()
# make the port as reusable port
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# bind the socket to the address we specified
s.bind((SERVER_HOST, SERVER_PORT))
# listen for upcoming connections
s.listen(5)
print(f"[*] Listening as {SERVER_HOST}:{SERVER_PORT}")

def listen(msg):
    msg = msg.replace(separator_token, ":")
    for client_socket in client_sockets:
            # and send the message
            # print(msg)
        x=msg.encode('utf-8')
        client_socket.send(struct.pack('!L', len(x))+x)#send(msg.encode())

def listen_for_messages(socket=s, callback=print):
    buff=b""
    size=0
    while True:
        buff+=(socket.recv(1024))
        if size == 0:
            size,=struct.unpack("!L", buff[:4])
            buff=buff[4:]
        if len(buff)>=size:
            callback(buff[:size].decode('utf-8'))
            buff=buff[size:]
            size=0

def listen_for_client(cs):
    #try:
        listen_for_messages(cs, listen)
    #except:
    #    print("Client disconnected")
    #    client_sockets.remove(cs)

while True:
    # we keep listening for new connections all the time
    client_socket, client_address = s.accept()
    print(f"[+] {client_address} connected.")
    # add the new connected client to connected sockets
    client_sockets.add(client_socket)
    # start a new thread that listens for each client's messages
    t = Thread(target=listen_for_client, args=(client_socket,))
    # make the thread daemon so it ends whenever the main thread ends
    t.daemon = True
    # start the thread
    t.start()

# close client sockets
for cs in client_sockets:
    cs.close()
# close server socket
s.close()