Function wait_host_port

pywebio/utils.py:243–269

Repeatedly try if a port on a host is open until duration seconds passed from: https://gist.github.com/betrcode/0248f0fda894013382d7#gistcomment-3161499 :param str host: host ip address or hostname :param int port: port number :param int/float duration: Optional. Total duration in

(host, port, duration=10, delay=2)

async def wait_host_port(host, port, duration=10, delay=2):
    """Repeatedly try if a port on a host is open until duration seconds passed

    from: https://gist.github.com/betrcode/0248f0fda894013382d7#gistcomment-3161499

    :param str host: host ip address or hostname
    :param int port: port number
    :param int/float duration: Optional. Total duration in seconds to wait, by default 10
    :param int/float delay: Optional. Delay in seconds between each try, by default 2
    :return: awaitable bool
    """
    tmax = time.time() + duration
    while time.time() < tmax:
        try:
            _, writer = await asyncio.wait_for(asyncio.open_connection(host, port), timeout=5)
            writer.close()

            # asyncio.StreamWriter.wait_closed is introduced in py 3.7
            # See https://docs.python.org/3/library/asyncio-stream.html#asyncio.StreamWriter.wait_closed
            if hasattr(writer, 'wait_closed'):
                await writer.wait_closed()

            return True
        except Exception:
            if delay:
                await asyncio.sleep(delay)
    return False


def get_free_port():