simple socket server for serving flash crossdomain policy

socket.crossdomain.py

import errno
import functools
import socket
from tornado import ioloop, iostream

def connection_ready(sock, fd, events):
    while True:
        try:
            connection, address = sock.accept()
        except socket.error, e:
            if e[0] not in (errno.EWOULDBLOCK, errno.EAGAIN):
                raise
            return
        connection.setblocking(0)
        stream = iostream.IOStream(connection)
        stream.write("""

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy><site-control permitted-cross-domain-policies="all"/>
<allow-access-from domain="*.aifang.com" to-ports="*" />
<allow-access-from domain="*.pages.aifcdn.com" to-ports="*" />
<allow-access-from domain="*.aifcdn.com" to-ports="*" />
<allow-access-from domain="anjuke.adsame.com" to-ports="*" />
<allow-access-from domain="anjuke.adsame.com" to-ports="*" />
</cross-domain-policy>
""")

if __name__ == '__main__':
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.setblocking(0)
    sock.bind(("", 843))
    sock.listen(5000)

    io_loop = ioloop.IOLoop.instance()
    callback = functools.partial(connection_ready, sock)
    io_loop.add_handler(sock.fileno(), callback, io_loop.READ)
    try:
        io_loop.start()
    except KeyboardInterrupt:
        io_loop.stop()
        print "exited cleanly"