can't close socket on KeyboardInterrupt

Question

from socket import socket, AF_INET, SOCK_STREAM

sock = socket(AF_INET, SOCK_STREAM)
sock.bind(("localhost", 7777))
sock.listen(1)
while True:
    try:
        connection, address = sock.accept()
        print("connected from " + address)
        received_message = sock.recv(300)
        if not received_message:
            break
        connection.sendall(b"hello")

    except KeyBoardInterrupt:
        connection.close()

so Im trying to wrap my head around sockets and have this pretty simple script but for some reason I can't kill this script with a KeyboardInterrupt

how do I do kill the script with a KeyboardInterrupt that and why can't I kill it with a KeyboardInterrupt?

Answer 1

1. To break to get out the while loop. Without break, the loop will not end.
2. To be safe, check whether connection is set.

---

from socket import socket, AF_INET, SOCK_STREAM

sock = socket(AF_INET, SOCK_STREAM)
sock.bind(("localhost", 7777))
sock.listen(1)
while True:
    connection = None # <---
    try:
        connection, address = sock.accept()
        print("connected from ", address)
        received_message = connection.recv(300)
        if not received_message:
            break
        connection.sendall(b"hello")
    except KeyboardInterrupt:
        if connection:  # <---
            connection.close()
        break  # <---

UPDATE

• There was a typo: KeyBoardInterrupt should be KeyboardInterrupt.
• sock.recv should be connection.recv.

Answer 2

Try to use timeout to make the program periodically "jumps out" from the accept waiting process to receive KeyboardInterrupt command.

Here is an example of socket server:

import socket

host = "127.0.0.1"
port = 23333

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

sock.bind((host,port))
sock.listen()

sock.settimeout(0.5)

print("> Listening {}:{} ...".format(host,port))

try:
    while True:
        try:
            conn, addr = sock.accept()
            data = conn.recv(1024)
            if not data:
                print("x Client disconnected!")
                # break
            else:
                print("> Message from client: {}".format(data.decode()))
                msg = "> Message from server".format(data.decode()).encode()
                conn.sendall(msg)
        except socket.timeout:
            # print("Timeout")
            pass
        except KeyboardInterrupt:
            pass
except KeyboardInterrupt:
    print("Server closed with KeyboardInterrupt!")
    sock.close()

Answer 3

Try adding a timeout to the socket, like so:

from socket import socket, AF_INET, SOCK_STREAM
sock = socket(AF_INET, SOCK_STREAM)
sock.bind(("localhost", 7777))
sock.settimeout(1.0)
sock.listen(1)
while True:
    try:
        connection, address = sock.accept()
        print("connected from " + address)
        received_message = sock.recv(300)
        if not received_message:
            break
        connection.sendall(b"hello")
    except IOError as msg:
        print(msg)
        continue    
    except KeyboardInterrupt:
        try:
            if connection:
                connection.close()
        except: pass
        break
sock.shutdown
sock.close()