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+%% This Source Code Form is subject to the terms of the Mozilla Public
+%% License, v. 2.0. If a copy of the MPL was not distributed with this
+%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
+%%
+%% Copyright (c) 2018-2020 VMware, Inc. or its affiliates. All rights reserved.
+%%
+
+-module(single_active_consumer_SUITE).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("eunit/include/eunit.hrl").
+-include_lib("amqp_client/include/amqp_client.hrl").
+
+-compile(export_all).
+
+-define(TIMEOUT, 30000).
+
+all() ->
+ [
+ {group, classic_queue}, {group, quorum_queue}
+ ].
+
+groups() ->
+ [
+ {classic_queue, [], [
+ all_messages_go_to_one_consumer,
+ fallback_to_another_consumer_when_first_one_is_cancelled,
+ fallback_to_another_consumer_when_exclusive_consumer_channel_is_cancelled,
+ fallback_to_another_consumer_when_first_one_is_cancelled_manual_acks,
+ amqp_exclusive_consume_fails_on_exclusive_consumer_queue
+ ]},
+ {quorum_queue, [], [
+ all_messages_go_to_one_consumer,
+ fallback_to_another_consumer_when_first_one_is_cancelled,
+ fallback_to_another_consumer_when_exclusive_consumer_channel_is_cancelled,
+ fallback_to_another_consumer_when_first_one_is_cancelled_manual_acks,
+ basic_get_is_unsupported
+ %% amqp_exclusive_consume_fails_on_exclusive_consumer_queue % Exclusive consume not implemented in QQ
+ ]}
+ ].
+
+init_per_suite(Config0) ->
+ rabbit_ct_helpers:log_environment(),
+ Config1 = rabbit_ct_helpers:set_config(Config0, [
+ {rmq_nodename_suffix, ?MODULE}
+ ]),
+ Config = rabbit_ct_helpers:merge_app_env(
+ Config1, {rabbit, [{quorum_tick_interval, 1000}]}),
+ rabbit_ct_helpers:run_setup_steps(Config,
+ rabbit_ct_broker_helpers:setup_steps() ++
+ rabbit_ct_client_helpers:setup_steps()).
+
+end_per_suite(Config) ->
+ rabbit_ct_helpers:run_teardown_steps(Config,
+ rabbit_ct_client_helpers:teardown_steps() ++
+ rabbit_ct_broker_helpers:teardown_steps()).
+
+init_per_group(classic_queue, Config) ->
+ [{single_active_consumer_queue_declare,
+ #'queue.declare'{arguments = [
+ {<<"x-single-active-consumer">>, bool, true},
+ {<<"x-queue-type">>, longstr, <<"classic">>}
+ ],
+ auto_delete = true}
+ } | Config];
+init_per_group(quorum_queue, Config) ->
+ Ret = rabbit_ct_broker_helpers:rpc(
+ Config, 0, rabbit_feature_flags, enable, [quorum_queue]),
+ case Ret of
+ ok ->
+ [{single_active_consumer_queue_declare,
+ #'queue.declare'{
+ arguments = [
+ {<<"x-single-active-consumer">>, bool, true},
+ {<<"x-queue-type">>, longstr, <<"quorum">>}
+ ],
+ durable = true, exclusive = false, auto_delete = false}
+ } | Config];
+ Error ->
+ {skip, {"Quorum queues are unsupported", Error}}
+ end.
+
+end_per_group(_, Config) ->
+ Config.
+
+init_per_testcase(Testcase, Config0) ->
+ Config = [{queue_name, atom_to_binary(Testcase, utf8)} | Config0],
+ rabbit_ct_helpers:testcase_started(Config, Testcase).
+end_per_testcase(Testcase, Config) ->
+ rabbit_ct_helpers:testcase_finished(Config, Testcase).
+
+all_messages_go_to_one_consumer(Config) ->
+ {C, Ch} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+ MessageCount = 5,
+ ConsumerPid = spawn(?MODULE, consume, [{self(), {maps:new(), 0}, MessageCount}]),
+ #'basic.consume_ok'{consumer_tag = CTag1} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = true}, ConsumerPid),
+ #'basic.consume_ok'{consumer_tag = CTag2} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = true}, ConsumerPid),
+
+ Publish = #'basic.publish'{exchange = <<>>, routing_key = Q},
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}) || _X <- lists:seq(1, MessageCount)],
+
+ receive
+ {consumer_done, {MessagesPerConsumer, MessageCount}} ->
+ ?assertEqual(MessageCount, MessageCount),
+ ?assertEqual(2, maps:size(MessagesPerConsumer)),
+ ?assertEqual(MessageCount, maps:get(CTag1, MessagesPerConsumer)),
+ ?assertEqual(0, maps:get(CTag2, MessagesPerConsumer))
+ after ?TIMEOUT ->
+ flush(),
+ throw(failed)
+ end,
+
+ amqp_connection:close(C),
+ ok.
+
+fallback_to_another_consumer_when_first_one_is_cancelled(Config) ->
+ {C, Ch} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+ MessageCount = 10,
+ ConsumerPid = spawn(?MODULE, consume, [{self(), {maps:new(), 0}, MessageCount}]),
+ #'basic.consume_ok'{consumer_tag = CTag1} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = true}, ConsumerPid),
+ #'basic.consume_ok'{consumer_tag = CTag2} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = true}, ConsumerPid),
+ #'basic.consume_ok'{consumer_tag = CTag3} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = true}, ConsumerPid),
+
+ Publish = #'basic.publish'{exchange = <<>>, routing_key = Q},
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}) || _X <- lists:seq(1, MessageCount div 2)],
+
+ {ok, {MessagesPerConsumer1, _}} = wait_for_messages(MessageCount div 2),
+ FirstActiveConsumerInList = maps:keys(maps:filter(fun(_CTag, Count) -> Count > 0 end, MessagesPerConsumer1)),
+ ?assertEqual(1, length(FirstActiveConsumerInList)),
+
+ FirstActiveConsumer = lists:nth(1, FirstActiveConsumerInList),
+ #'basic.cancel_ok'{} = amqp_channel:call(Ch, #'basic.cancel'{consumer_tag = FirstActiveConsumer}),
+
+ {cancel_ok, FirstActiveConsumer} = wait_for_cancel_ok(),
+
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}) || _X <- lists:seq(MessageCount div 2 + 1, MessageCount - 1)],
+
+ {ok, {MessagesPerConsumer2, _}} = wait_for_messages(MessageCount div 2 - 1),
+ SecondActiveConsumerInList = maps:keys(maps:filter(
+ fun(CTag, Count) -> Count > 0 andalso CTag /= FirstActiveConsumer end,
+ MessagesPerConsumer2)
+ ),
+ ?assertEqual(1, length(SecondActiveConsumerInList)),
+ SecondActiveConsumer = lists:nth(1, SecondActiveConsumerInList),
+
+ #'basic.cancel_ok'{} = amqp_channel:call(Ch, #'basic.cancel'{consumer_tag = SecondActiveConsumer}),
+
+ amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}),
+ ?assertMatch({ok, _}, wait_for_messages(1)),
+
+ LastActiveConsumer = lists:nth(1, lists:delete(FirstActiveConsumer, lists:delete(SecondActiveConsumer, [CTag1, CTag2, CTag3]))),
+
+ receive
+ {consumer_done, {MessagesPerConsumer, MessageCount}} ->
+ ?assertEqual(MessageCount, MessageCount),
+ ?assertEqual(3, maps:size(MessagesPerConsumer)),
+ ?assertEqual(MessageCount div 2, maps:get(FirstActiveConsumer, MessagesPerConsumer)),
+ ?assertEqual(MessageCount div 2 - 1, maps:get(SecondActiveConsumer, MessagesPerConsumer)),
+ ?assertEqual(1, maps:get(LastActiveConsumer, MessagesPerConsumer))
+ after ?TIMEOUT ->
+ flush(),
+ throw(failed)
+ end,
+
+ amqp_connection:close(C),
+ ok.
+
+fallback_to_another_consumer_when_first_one_is_cancelled_manual_acks(Config) ->
+ %% Let's ensure that although the consumer is cancelled we still keep the unacked
+ %% messages and accept acknowledgments on them.
+ [Server | _] = rabbit_ct_broker_helpers:get_node_configs(Config, nodename),
+ {C, Ch} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+ #'basic.consume_ok'{} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = false}, self()),
+ #'basic.consume_ok'{} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = false}, self()),
+ #'basic.consume_ok'{} =
+ amqp_channel:subscribe(Ch, #'basic.consume'{queue = Q, no_ack = false}, self()),
+ Consumers0 = rpc:call(Server, rabbit_amqqueue, consumers_all, [<<"/">>]),
+ ?assertMatch([_, _, _], lists:filter(fun(Props) ->
+ Resource = proplists:get_value(queue_name, Props),
+ Q == Resource#resource.name
+ end, Consumers0)),
+
+ Publish = #'basic.publish'{exchange = <<>>, routing_key = Q},
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = P}) || P <- [<<"msg1">>, <<"msg2">>]],
+
+ {CTag, DTag1} = receive_deliver(),
+ {_CTag, DTag2} = receive_deliver(),
+
+ quorum_queue_utils:wait_for_messages(Config, [[Q, <<"2">>, <<"0">>, <<"2">>]]),
+ #'basic.cancel_ok'{} = amqp_channel:call(Ch, #'basic.cancel'{consumer_tag = CTag}),
+
+ receive
+ #'basic.cancel_ok'{consumer_tag = CTag} ->
+ ok
+ end,
+ Consumers1 = rpc:call(Server, rabbit_amqqueue, consumers_all, [<<"/">>]),
+ ?assertMatch([_, _], lists:filter(fun(Props) ->
+ Resource = proplists:get_value(queue_name, Props),
+ Q == Resource#resource.name
+ end, Consumers1)),
+ quorum_queue_utils:wait_for_messages(Config, [[Q, <<"2">>, <<"0">>, <<"2">>]]),
+
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = P}) || P <- [<<"msg3">>, <<"msg4">>]],
+
+ quorum_queue_utils:wait_for_messages(Config, [[Q, <<"4">>, <<"0">>, <<"4">>]]),
+ amqp_channel:cast(Ch, #'basic.ack'{delivery_tag = DTag1}),
+ amqp_channel:cast(Ch, #'basic.ack'{delivery_tag = DTag2}),
+ quorum_queue_utils:wait_for_messages(Config, [[Q, <<"2">>, <<"0">>, <<"2">>]]),
+
+ amqp_connection:close(C),
+ ok.
+
+fallback_to_another_consumer_when_exclusive_consumer_channel_is_cancelled(Config) ->
+ {C, Ch} = connection_and_channel(Config),
+ {C1, Ch1} = connection_and_channel(Config),
+ {C2, Ch2} = connection_and_channel(Config),
+ {C3, Ch3} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+ MessageCount = 10,
+ Consumer1Pid = spawn(?MODULE, consume, [{self(), {maps:new(), 0}, MessageCount div 2}]),
+ Consumer2Pid = spawn(?MODULE, consume, [{self(), {maps:new(), 0}, MessageCount div 2 - 1}]),
+ Consumer3Pid = spawn(?MODULE, consume, [{self(), {maps:new(), 0}, MessageCount div 2 - 1}]),
+ #'basic.consume_ok'{consumer_tag = CTag1} =
+ amqp_channel:subscribe(Ch1, #'basic.consume'{queue = Q, no_ack = true, consumer_tag = <<"1">>}, Consumer1Pid),
+ #'basic.consume_ok'{} =
+ amqp_channel:subscribe(Ch2, #'basic.consume'{queue = Q, no_ack = true, consumer_tag = <<"2">>}, Consumer2Pid),
+ #'basic.consume_ok'{} =
+ amqp_channel:subscribe(Ch3, #'basic.consume'{queue = Q, no_ack = true, consumer_tag = <<"3">>}, Consumer3Pid),
+
+ Publish = #'basic.publish'{exchange = <<>>, routing_key = Q},
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}) || _X <- lists:seq(1, MessageCount div 2)],
+
+ {MessagesPerConsumer1, MessageCount1} = consume_results(),
+ ?assertEqual(MessageCount div 2, MessageCount1),
+ ?assertEqual(1, maps:size(MessagesPerConsumer1)),
+ ?assertEqual(MessageCount div 2, maps:get(CTag1, MessagesPerConsumer1)),
+
+ ok = amqp_channel:close(Ch1),
+
+ [amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"foobar">>}) || _X <- lists:seq(MessageCount div 2 + 1, MessageCount - 1)],
+
+ {MessagesPerConsumer2, MessageCount2} = consume_results(),
+ ?assertEqual(MessageCount div 2 - 1, MessageCount2),
+ ?assertEqual(1, maps:size(MessagesPerConsumer2)),
+
+ ok = amqp_channel:close(Ch2),
+
+ amqp_channel:cast(Ch, Publish, #amqp_msg{payload = <<"poison">>}),
+
+ {MessagesPerConsumer3, MessageCount3} = consume_results(),
+ ?assertEqual(1, MessageCount3),
+ ?assertEqual(1, maps:size(MessagesPerConsumer3)),
+
+ [amqp_connection:close(Conn) || Conn <- [C1, C2, C3, C]],
+ ok.
+
+basic_get_is_unsupported(Config) ->
+ {C, Ch} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+
+ ?assertExit(
+ {{shutdown, {server_initiated_close, 405, _}}, _},
+ amqp_channel:call(Ch, #'basic.get'{queue = Q, no_ack = false})),
+
+ amqp_connection:close(C),
+ ok.
+
+amqp_exclusive_consume_fails_on_exclusive_consumer_queue(Config) ->
+ {C, Ch} = connection_and_channel(Config),
+ Q = queue_declare(Ch, Config),
+ ?assertExit(
+ {{shutdown, {server_initiated_close, 403, _}}, _},
+ amqp_channel:call(Ch, #'basic.consume'{queue = Q, exclusive = true})
+ ),
+ amqp_connection:close(C),
+ ok.
+
+connection_and_channel(Config) ->
+ C = rabbit_ct_client_helpers:open_unmanaged_connection(Config),
+ {ok, Ch} = amqp_connection:open_channel(C),
+ {C, Ch}.
+
+queue_declare(Channel, Config) ->
+ QueueName = ?config(queue_name, Config),
+ Declare0 = ?config(single_active_consumer_queue_declare, Config),
+ Declare = Declare0#'queue.declare'{queue = QueueName},
+ #'queue.declare_ok'{queue = Q} = amqp_channel:call(Channel, Declare),
+ Q.
+
+consume({Parent, State, 0}) ->
+ Parent ! {consumer_done, State};
+consume({Parent, {MessagesPerConsumer, MessageCount}, CountDown}) ->
+ receive
+ #'basic.consume_ok'{consumer_tag = CTag} ->
+ consume({Parent, {maps:put(CTag, 0, MessagesPerConsumer), MessageCount}, CountDown});
+ {#'basic.deliver'{consumer_tag = CTag}, #amqp_msg{payload = <<"poison">>}} ->
+ Parent ! {consumer_done,
+ {maps:update_with(CTag, fun(V) -> V + 1 end, MessagesPerConsumer),
+ MessageCount + 1}};
+ {#'basic.deliver'{consumer_tag = CTag}, _Content} ->
+ NewState = {maps:update_with(CTag, fun(V) -> V + 1 end, MessagesPerConsumer),
+ MessageCount + 1},
+ Parent ! {message, NewState},
+ consume({Parent, NewState, CountDown - 1});
+ #'basic.cancel_ok'{consumer_tag = CTag} ->
+ Parent ! {cancel_ok, CTag},
+ consume({Parent, {MessagesPerConsumer, MessageCount}, CountDown});
+ _ ->
+ consume({Parent, {MessagesPerConsumer, MessageCount}, CountDown})
+ after ?TIMEOUT ->
+ Parent ! {consumer_timeout, {MessagesPerConsumer, MessageCount}},
+ flush(),
+ exit(consumer_timeout)
+ end.
+
+consume_results() ->
+ receive
+ {consumer_done, {MessagesPerConsumer, MessageCount}} ->
+ {MessagesPerConsumer, MessageCount};
+ {consumer_timeout, {MessagesPerConsumer, MessageCount}} ->
+ {MessagesPerConsumer, MessageCount};
+ _ ->
+ consume_results()
+ after ?TIMEOUT ->
+ flush(),
+ throw(failed)
+ end.
+
+wait_for_messages(ExpectedCount) ->
+ wait_for_messages(ExpectedCount, {}).
+
+wait_for_messages(0, State) ->
+ {ok, State};
+wait_for_messages(ExpectedCount, State) ->
+ receive
+ {message, {MessagesPerConsumer, MessageCount}} ->
+ wait_for_messages(ExpectedCount - 1, {MessagesPerConsumer, MessageCount})
+ after 5000 ->
+ {missing, ExpectedCount, State}
+ end.
+
+wait_for_cancel_ok() ->
+ receive
+ {cancel_ok, CTag} ->
+ {cancel_ok, CTag}
+ after 5000 ->
+ throw(consumer_cancel_ok_timeout)
+ end.
+
+receive_deliver() ->
+ receive
+ {#'basic.deliver'{consumer_tag = CTag,
+ delivery_tag = DTag}, _} ->
+ {CTag, DTag}
+ after 5000 ->
+ exit(deliver_timeout)
+ end.
+
+flush() ->
+ receive
+ Msg ->
+ ct:pal("flushed: ~w~n", [Msg]),
+ flush()
+ after 10 ->
+ ok
+ end.