"""Explicit local serving entry point; importing it starts no server."""


def local_ips():
    import socket
    ips = set()
    try:
        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as connection:
            connection.connect(('8.8.8.8', 80))
            ips.add(connection.getsockname()[0])
    except Exception:
        pass
    try:
        for info in socket.getaddrinfo(socket.gethostname(), None, socket.AF_INET):
            ip = info[4][0]
            if not ip.startswith('127.'):
                ips.add(ip)
    except Exception:
        pass
    return sorted(ips)


def serve_app(app):
    host, port = app.config['HOST'], app.config['PORT']
    print(f'Local: http://127.0.0.1:{port}')
    for ip in local_ips():
        print(f'LAN: http://{ip}:{port}')
    try:
        from waitress import serve
    except ImportError:
        app.run(host=host, port=port, debug=True, use_reloader=False)
    else:
        serve(app, host=host, port=port, threads=8)