Sending text / chat messages

# https://www.youtube.com/watch?v=3QiPPX-KeSc

# Server.py

import socket, threading

HEADER = 64

SERVER = socket.gethostbyname(socket.gethostname())

PORT = 5050

ADDR = (SERVER, PORT)

FORMAT = "utf-8"

DISCONNECT_MESSAGE = "!DISCONNECT"

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

server.bind(ADDR)

def handle_client(conn, addr):

  print(f"[NEW CONNECTION] {addr} connected.")

  connected = True

  while connected:

    msg_length = conn.recv(HEADER).decode(FORMAT)

    if msg_length:

      msg_length = int(msg_length)

      msg = conn.recv(msg_length).decode(FORMAT)

      if msg == DISCONNECT_MESSAGE:

        connected = False

      print(f"[{addr}] {msg}")

      conn.send("Msg received".encode(FORMAT))

  conn.close()

def start():

  server.listen()

  print(f"[LISTENING] Server is listening on {SERVER}")

  while True:

    conn, addr = server.accept()

    thread = threading.Thread(target=handle_client, args=(conn, addr))

    thread.start()

    print(f"[ACTIVE CONNECTIONS] {threading.activeCount()-1}")

    

print("[STARTING] Server is starting ...")

start()

# Client.py

import socket

HEADER = 64

PORT = 5050

FORMAT = "utf-8"

DISCONNECT_MESSAGE = "!DISCONNECT"

SERVER = socket.gethostbyname(socket.gethostname())

ADDR = (SERVER, PORT)

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

client.connect(ADDR)

def send(msg):

  message = msg.encode(FORMAT)

  msg_length = len(message)

  send_length = str(msg_length).encode(FORMAT)

  send_length += b' ' * (HEADER - len(send_length))

  client.send(send_length)

  client.send(message)

  print(client.recv(2048).decode(FORMAT))

send("Hello World!")

send("Hello All")

send("Hello Binoy!")

send(DISCONNECT_MESSAGE)