#!/usr/bin/env python3
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# Test whether a retained PUBLISH is cleared when a zero length retained
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# message is published to a topic.
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from mosq_test_helper import *
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rc = 1
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keepalive = 60
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connect_packet = mosq_test.gen_connect("retain-clear-test", keepalive=keepalive)
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connack_packet = mosq_test.gen_connack(rc=0)
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publish_packet = mosq_test.gen_publish("retain/clear/test", qos=0, payload="retained message", retain=True)
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retain_clear_packet = mosq_test.gen_publish("retain/clear/test", qos=0, payload=None, retain=True)
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mid_sub = 592
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subscribe_packet = mosq_test.gen_subscribe(mid_sub, "retain/clear/test", 0)
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suback_packet = mosq_test.gen_suback(mid_sub, 0)
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mid_unsub = 593
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unsubscribe_packet = mosq_test.gen_unsubscribe(mid_unsub, "retain/clear/test")
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unsuback_packet = mosq_test.gen_unsuback(mid_unsub)
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port = mosq_test.get_port()
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broker = mosq_test.start_broker(filename=os.path.basename(__file__), port=port)
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try:
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sock = mosq_test.do_client_connect(connect_packet, connack_packet, timeout=4, port=port)
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# Send retained message
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sock.send(publish_packet)
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# Subscribe to topic, we should get the retained message back.
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mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback")
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if mosq_test.expect_packet(sock, "publish", publish_packet):
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# Now unsubscribe from the topic before we clear the retained
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# message.
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mosq_test.do_send_receive(sock, unsubscribe_packet, unsuback_packet, "unsuback")
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# Now clear the retained message.
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sock.send(retain_clear_packet)
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# Subscribe to topic, we shouldn't get anything back apart
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# from the SUBACK.
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mosq_test.do_send_receive(sock, subscribe_packet, suback_packet, "suback")
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time.sleep(1)
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# If we do get something back, it should be before this ping, so if
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# this succeeds then we're ok.
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mosq_test.do_ping(sock)
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# This is the expected event
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rc = 0
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sock.close()
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finally:
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broker.terminate()
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broker.wait()
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(stdo, stde) = broker.communicate()
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if rc:
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print(stde.decode('utf-8'))
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exit(rc)
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