Multi-user Group Chat Server function to send and receive clients messages

server_send_receive_client_message.py

### several lines of codes ommitted
### See https://gist.github.com/effiongcharles/4976708e0791cfc959953743e4650b5e.js for preceeing codes

# Function to receive message from current client AND
# Send that message to other clients
def send_receive_client_message(client_connection, client_ip_addr):
    global server, client_name, clients, clients_addr
    client_msg = " "

    # send welcome message to client
    client_name  = client_connection.recv(4096)
    client_connection.send("Welcome " + client_name + ". Use 'exit' to quit")

    clients_names.append(client_name)

    update_client_names_display(clients_names)  # update client names display


    while True:
        data = client_connection.recv(4096)
        if not data: break
        if data == "exit": break

        client_msg = data

        idx = get_client_index(clients, client_connection)
        sending_client_name = clients_names[idx]

        for c in clients:
            if c != client_connection:
                c.send(sending_client_name + "->" + client_msg)

    # find the client index then remove from both lists(client name list and connection list)
    idx = get_client_index(clients, client_connection)
    del clients_names[idx]
    del clients[idx]
    client_connection.close()

    update_client_names_display(clients_names)  # update client names display


# Helper function to return the index of the current client in the list of clients
def get_client_index(client_list, curr_client):
    idx = 0
    for conn in client_list:
        if conn == curr_client:
            break
        idx = idx + 1

    return idx


# Helper function to Update client name display when a new client connects OR
# When a connected client disconnects
def update_client_names_display(name_list):
    tkDisplay.config(state=tk.NORMAL)
    tkDisplay.delete('1.0', tk.END)

    for c in name_list:
        tkDisplay.insert(tk.END, c+"\n")
    tkDisplay.config(state=tk.DISABLED)