Learning Python Networking - Second Edition

Introducing non-blocking I/O

First, we are going to review a simple example of non-blocking I/O for the socket server. This script will run a socket server and listen in a non-blocking style. This means that you can connect more clients who won't be necessarily blocked for I/O.

You can find the following code in the server_socket_async.py file:

#!/usr/bin/env python3import socketif __name__ == '__main__':    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)    #unset blocking    sock.setblocking(0)    sock.settimeout(0.5)    sock.bind(("127.0.0.1", 12345))    socket_address =sock.getsockname()    print("Asynchronous socket server launched on socket: %s" %str(socket_address))    while(1):        sock.listen(1)

From a client point of view, when we make a socket non-blocking ...