#!/usr/bin/env python3

# Test whether a client will is transmitted correctly with a null payload.

from mosq_test_helper import *

def helper(port, proto_ver):
    connect_packet = mosq_test.gen_connect("07-will-null-helper", will_topic="will/null/test", proto_ver=proto_ver)
    connack_packet = mosq_test.gen_connack(rc=0, proto_ver=proto_ver)
    sock = mosq_test.do_client_connect(connect_packet, connack_packet, port=port)
    sock.close()

def do_test(start_broker, proto_ver):
    rc = 1
    mid = 53
    connect_packet = mosq_test.gen_connect("07-will-null-test", proto_ver=proto_ver)
    connack_packet = mosq_test.gen_connack(rc=0, proto_ver=proto_ver)

    subscribe_packet = mosq_test.gen_subscribe(mid, "will/null/test", 0, proto_ver=proto_ver)
    suback_packet = mosq_test.gen_suback(mid, 0, proto_ver=proto_ver)

    publish_packet = mosq_test.gen_publish("will/null/test", qos=0, proto_ver=proto_ver)

    port = mosq_test.get_port()
    if start_broker:
        broker = mosq_test.start_broker(filename=os.path.basename(__file__), port=port)

    try:
        sock = mosq_test.do_client_connect(connect_packet, connack_packet, timeout=30, port=port)
        mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback")

        helper(port, proto_ver)

        mosq_test.expect_packet(sock, "publish", publish_packet)
        rc = 0

        sock.close()
    except mosq_test.TestError:
        pass
    finally:
        if start_broker:
            mosq_test.terminate_broker(broker)
            if mosq_test.wait_for_subprocess(broker):
                print("broker not terminated")
                if rc == 0: rc=1
            if rc:
                print(mosq_test.broker_log(broker))
                print("proto_ver=%d" % (proto_ver))
                exit(rc)
        else:
            return rc


def all_tests(start_broker=False):
    rc = do_test(start_broker, proto_ver=4)
    if rc:
        return rc;
    rc = do_test(start_broker, proto_ver=5)
    if rc:
        return rc;
    return 0

if __name__ == '__main__':
    all_tests(True)
