circuitpython/tests/net_hosted/connect_poll.py

# test that socket.connect() has correct polling behaviour before, during and after

try:
    import usocket as socket, uselect as select
except:
    import socket, select


def test(peer_addr):
    s = socket.socket()
    poller = select.poll()
    poller.register(s)

    # test poll before connect
    # note: CPython can return POLLHUP, so use the IN|OUT mask
    p = poller.poll(0)
    print(len(p), p[0][-1] & (select.POLLIN | select.POLLOUT))

    s.connect(peer_addr)

    # test poll during connection
    print(len(poller.poll(0)))

    # test poll after connection is established
    p = poller.poll(1000)
    print(len(p), p[0][-1])

    s.close()


if __name__ == "__main__":
    test(socket.getaddrinfo("micropython.org", 80)[0][-1])