#!/usr/bin/env python3

# Test whether the broker reduces the message expiry interval when republishing
# a retained message, and eventually removes it.
# MQTT v5

# Helper publishes a message, with a medium length expiry with retained set. It
# publishes a second message with retained set but no expiry.
# Client connects, subscribes, gets messages, disconnects.
# We wait until the expiry will have expired.
# Client connects, subscribes, doesn't get expired message, does get
# non-expired message.

from mosq_test_helper import *

def do_test(start_broker):
    rc = 1
    connect_packet = mosq_test.gen_connect("02-subpub-qos1-msg-expiry-retain", proto_ver=5)
    connack_packet = mosq_test.gen_connack(rc=0, proto_ver=5)

    mid = 1
    subscribe1_packet = mosq_test.gen_subscribe(mid, "02/subpub/expiry/retain/expired", 1, proto_ver=5)
    suback1_packet = mosq_test.gen_suback(mid, 1, proto_ver=5)

    mid = 2
    subscribe2_packet = mosq_test.gen_subscribe(mid, "02/subpub/expiry/retain/kept", 1, proto_ver=5)
    suback2_packet = mosq_test.gen_suback(mid, 1, proto_ver=5)

    helper_connect = mosq_test.gen_connect("02-subpub-qos1-msg-expiry-retain-helper", proto_ver=5)
    helper_connack = mosq_test.gen_connack(rc=0, proto_ver=5)

    mid=1
    props = mqtt5_props.gen_uint32_prop(mqtt5_props.PROP_MESSAGE_EXPIRY_INTERVAL, 2)
    publish1_packet = mosq_test.gen_publish("02/subpub/expiry/retain/expired", mid=mid, qos=1, retain=True, payload="message1", proto_ver=5, properties=props)
    puback1_packet = mosq_test.gen_puback(mid, proto_ver=5, reason_code=mqtt5_rc.MQTT_RC_NO_MATCHING_SUBSCRIBERS)

    mid=2
    publish2s_packet = mosq_test.gen_publish("02/subpub/expiry/retain/kept", mid=mid, qos=1, retain=True, payload="message2", proto_ver=5)
    puback2s_packet = mosq_test.gen_puback(mid, proto_ver=5, reason_code=mqtt5_rc.MQTT_RC_NO_MATCHING_SUBSCRIBERS)

    mid=1
    publish2r_packet = mosq_test.gen_publish("02/subpub/expiry/retain/kept", mid=mid, qos=1, retain=True, payload="message2", proto_ver=5)
    puback2r_packet = mosq_test.gen_puback(mid, proto_ver=5, reason_code=mqtt5_rc.MQTT_RC_NO_MATCHING_SUBSCRIBERS)


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

    try:
        helper = mosq_test.do_client_connect(helper_connect, helper_connack, timeout=20, port=port)
        mosq_test.do_send_receive(helper, publish1_packet, puback1_packet, "puback 1")
        mosq_test.do_send_receive(helper, publish2s_packet, puback2s_packet, "puback 2")
        helper.close()

        sock = mosq_test.do_client_connect(connect_packet, connack_packet, timeout=20, port=port)
        mosq_test.do_send_receive(sock, subscribe1_packet, suback1_packet, "suback 1-1")

        mosq_test.expect_packet(sock, "publish 1", publish1_packet)
        sock.send(puback1_packet)

        mosq_test.do_send_receive(sock, subscribe2_packet, suback2_packet, "suback 2-1")
        mosq_test.expect_packet(sock, "publish 2", publish2s_packet)
        sock.send(puback2s_packet)
        sock.close()

        time.sleep(3)
        sock = mosq_test.do_client_connect(connect_packet, connack_packet, timeout=20, port=port)
        mosq_test.do_send_receive(sock, subscribe1_packet, suback1_packet, "suback 1-2")
        # We shouldn't receive a publish here
        # This will fail if we do receive a publish
        mosq_test.do_send_receive(sock, subscribe2_packet, suback2_packet, "suback 2-2")
        mosq_test.expect_packet(sock, "publish 2", publish2r_packet)
        sock.send(puback2r_packet)
        sock.close()
        rc = 0

    except mosq_test.TestError:
        pass
    finally:
        if start_broker:
            broker.terminate()
            if mosq_test.wait_for_subprocess(broker):
                print("broker not terminated")
                if rc == 0: rc=1
            (stdo, stde) = broker.communicate()
            if rc:
                print(stde.decode('utf-8'))
                print("proto_ver=%d" % (proto_ver))
                exit(rc)
        else:
            return rc


def all_tests(start_broker=False):
    return do_test(start_broker)

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