Tornado io_loop

import errno
import functools
import socket

import tornado.ioloop
from tornado.iostream import IOStream


async def handler_connection(connection, address):
    stream = IOStream(connection)
    message = await stream.read_until_close()
    print("message from client : ", message.decode().strip())


def connection_ready(sock, fd, events):
    while True:
        try:
            connection, address = sock.accept()
        except socket.error as e:
            if e.args[0] not in [errno.EWOULDBLOCK, errno.EAGAIN]:
                raise
            return
        connection.setblocking(0)
        io_loop = tornado.ioloop.IOLoop.current()
        io_loop.spawn_callback(handler_connection, connection, address)

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(('',8888))
    sock.listen(12)
    io_loop = tornado.ioloop.IOLoop.current()
    callback = functools.partial(connection_ready, sock)
    io_loop.add_handler(sock.fileno(), callback, io_loop.READ)
    io_loop.start()


#创建socket 连接后,获取tornado 的事件循环,然后把 socket 句柄和回调函数注册到事件循环中.可以循环每个socket连接