Ten Days of Code: Task 1

Task-1

Date: 03-Oct-20
Codes: task1_arnabsen1729

Problem Statement

Ping-Pong Clients

Make 2 client files which send data to each other using two different ports. One should send data (ex. "PING") and then receive some data (ex. "PONG").
While the other should first receive data and then send an appropriate response.

First initialise a socket connection and connect it to different network interfaces, for testing you can use the same hostname: localhost and different ports using socket.gethostname(). Sending data is done using sendto() method. It accepts as arguments, the data and the network interface address as a tuple containing hostname and port number. Receiving data is done using the recv() function; it needs a buffsize argument to denote the size of the data packet to be received.
P.S Also do not forget to encode and decode the data.

My Approach

Having a basic knowledge of sockets will suffice for this task. The @lugnitdgp team shared some resources (I will link them at the bottom).

I made two files. client1.py and client2.py. Client1 will act like a server. So in client1.py, I made a class for Server(I know it wasn't necessary but yeah clean code is always preferred <3 ) and it had the basic methods as described here:

METHODS	ARGS	RETURNS	DESCRIPTION
init()	ADDR, DISCON_MSG='QUIT'	Server Socket	create a socket object and start listening on ADDR and declare an disconnect token
accept_client()	none	conn, addr	accept a new client connection and returns the client socket and its address
recv_message()	conn, CHUNKS=1024, FORMAT='utf-8'	data recevied as String	receives the message from the client socket conn in chunks of CHUNKS and decodes it to FORMAT
send_resp()	conn, RESPONSE='PONG', FORMAT='utf-8'	none	sends the encoded response to the client socket conn, be default it os PONG. Follows the encoding specified in params

Then in the main body the client1.py I crated a socket object and follwed the usual order of methods.

1. socket()
2. bind()
3. listen()
4. accept()

Also I have added a token DISCON_MSG which will indicate when to close the connection.

For client2.py it is a very basic client script. Again I made a client Class, which has three methods only.

METHODS	ARGS	DESCRIPTION
init()	ADDR, DISCON_MSG='Q'	Initialises client socket and connects to ADDR
send_message()	message, FORMAT='utf-8'	send the encoded message to the connected server socket
recv_resp()	CHUNKS=1024, FORMAT='utf-8'	receive the response from the server (aka client1 ) in chunks of CHUNKS and decodes it in FORMAT and returns it

Sample

Resources

1. https://docs.python.org/3/library/socket.html
2. https://drive.google.com/file/d/17MDkLEWeBajEyqu-LzXZOhgxW9ZIUqv1/view?usp=sharing
3. https://drive.google.com/file/d/1jaNf0lfPFdChh5KhM1nAlCHPgy6wTrnQ/view?usp=sharing

Thanks to @lugnitdgp for the mentoring and guiding