616 lines
21 KiB
Erlang
616 lines
21 KiB
Erlang
%%--------------------------------------------------------------------
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%% Copyright (c) 2023-2024 EMQ Technologies Co., Ltd. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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%%--------------------------------------------------------------------
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-module(emqx_ds_backends_SUITE).
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-compile(export_all).
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-compile(nowarn_export_all).
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-include_lib("emqx/include/emqx.hrl").
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-include_lib("common_test/include/ct.hrl").
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-include_lib("stdlib/include/assert.hrl").
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-include_lib("emqx/include/asserts.hrl").
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-include_lib("snabbkaffe/include/snabbkaffe.hrl").
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-define(N_SHARDS, 1).
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opts(Config) ->
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proplists:get_value(ds_conf, Config).
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%% A simple smoke test that verifies that opening/closing the DB
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%% doesn't crash, and not much else
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t_00_smoke_open_drop(Config) ->
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DB = 'DB',
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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%% Reopen the DB and make sure the operation is idempotent:
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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%% Close the DB:
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?assertMatch(ok, emqx_ds:drop_db(DB)).
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%% A simple smoke test that verifies that storing the messages doesn't
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%% crash
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t_01_smoke_store(Config) ->
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?check_trace(
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#{timetrap => 10_000},
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begin
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DB = default,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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Msg = message(<<"foo/bar">>, <<"foo">>, 0),
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?assertMatch(ok, emqx_ds:store_batch(DB, [Msg]))
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end,
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[]
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).
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%% A simple smoke test that verifies that getting the list of streams
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%% doesn't crash and that iterators can be opened.
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t_02_smoke_get_streams_start_iter(Config) ->
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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StartTime = 0,
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TopicFilter = ['#'],
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[{Rank, Stream}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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?assertMatch({_, _}, Rank),
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?assertMatch({ok, _Iter}, emqx_ds:make_iterator(DB, Stream, TopicFilter, StartTime)).
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%% A simple smoke test that verifies that it's possible to iterate
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%% over messages.
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t_03_smoke_iterate(Config) ->
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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StartTime = 0,
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TopicFilter = ['#'],
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Msgs = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo">>, <<"2">>, 1),
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message(<<"bar/bar">>, <<"3">>, 2)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs, #{sync => true})),
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[{_, Stream}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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{ok, Iter0} = emqx_ds:make_iterator(DB, Stream, TopicFilter, StartTime),
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{ok, Iter, Batch} = emqx_ds_test_helpers:consume_iter(DB, Iter0),
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?assertEqual(Msgs, Batch, {Iter0, Iter}).
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%% Verify that iterators survive restart of the application. This is
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%% an important property, since the lifetime of the iterators is tied
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%% to the external resources, such as clients' sessions, and they
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%% should always be able to continue replaying the topics from where
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%% they are left off.
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t_04_restart(Config) ->
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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TopicFilter = ['#'],
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StartTime = 0,
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Msgs = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo">>, <<"2">>, 1),
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message(<<"bar/bar">>, <<"3">>, 2)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs, #{sync => true})),
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[{_, Stream}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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{ok, Iter0} = emqx_ds:make_iterator(DB, Stream, TopicFilter, StartTime),
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%% Restart the application:
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?tp(warning, emqx_ds_SUITE_restart_app, #{}),
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ok = application:stop(emqx_durable_storage),
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{ok, _} = application:ensure_all_started(emqx_durable_storage),
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ok = emqx_ds:open_db(DB, opts(Config)),
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%% The old iterator should be still operational:
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{ok, Iter, Batch} = emqx_ds_test_helpers:consume_iter(DB, Iter0),
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?assertEqual(Msgs, Batch, {Iter0, Iter}).
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%% Check that we can create iterators directly from DS keys.
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t_05_update_iterator(Config) ->
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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TopicFilter = ['#'],
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StartTime = 0,
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Msgs = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo">>, <<"2">>, 1),
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message(<<"bar/bar">>, <<"3">>, 2)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs)),
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[{_, Stream}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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{ok, Iter0} = emqx_ds:make_iterator(DB, Stream, TopicFilter, StartTime),
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Res0 = emqx_ds:next(DB, Iter0, 1),
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?assertMatch({ok, _OldIter, [{_Key0, _Msg0}]}, Res0),
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{ok, OldIter, [{Key0, Msg0}]} = Res0,
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Res1 = emqx_ds:update_iterator(DB, OldIter, Key0),
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?assertMatch({ok, _Iter1}, Res1),
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{ok, Iter1} = Res1,
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{ok, Iter, Batch} = emqx_ds_test_helpers:consume_iter(DB, Iter1, #{batch_size => 1}),
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?assertEqual(Msgs, [Msg0 | Batch], #{from_key => Iter1, final_iter => Iter}),
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ok.
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t_06_smoke_add_generation(Config) ->
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DB = ?FUNCTION_NAME,
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BeginTime = os:system_time(millisecond),
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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[{Gen1, #{created_at := Created1, since := Since1, until := undefined}}] = maps:to_list(
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emqx_ds:list_generations_with_lifetimes(DB)
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),
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?assertMatch(ok, emqx_ds:add_generation(DB)),
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[
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{Gen1, #{created_at := Created1, since := Since1, until := Until1}},
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{Gen2, #{created_at := Created2, since := Since2, until := undefined}}
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] = maps:to_list(emqx_ds:list_generations_with_lifetimes(DB)),
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%% Check units of the return values (+/- 10s from test begin time):
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?give_or_take(BeginTime, 10_000, Created1),
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?give_or_take(BeginTime, 10_000, Created2),
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?give_or_take(BeginTime, 10_000, Since2),
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?give_or_take(BeginTime, 10_000, Until1).
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t_07_smoke_update_config(Config) ->
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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?assertMatch(
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[{_, _}],
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maps:to_list(emqx_ds:list_generations_with_lifetimes(DB))
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),
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?assertMatch(ok, emqx_ds:update_db_config(DB, opts(Config))),
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?assertMatch(
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[{_, _}, {_, _}],
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maps:to_list(emqx_ds:list_generations_with_lifetimes(DB))
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).
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%% Verifies the basic usage of `list_generations_with_lifetimes' and `drop_generation'...
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%% 1) Cannot drop current generation.
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%% 2) All existing generations are returned by `list_generation_with_lifetimes'.
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%% 3) Dropping a generation removes it from the list.
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%% 4) Dropped generations stay dropped even after restarting the application.
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t_08_smoke_list_drop_generation(Config) ->
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DB = ?FUNCTION_NAME,
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?check_trace(
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begin
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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%% Exactly one generation at first.
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Generations0 = emqx_ds:list_generations_with_lifetimes(DB),
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?assertMatch(
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[{_GenId, #{since := _, until := _}}],
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maps:to_list(Generations0),
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#{gens => Generations0}
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),
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[{GenId0, _}] = maps:to_list(Generations0),
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%% Cannot delete current generation
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?assertEqual({error, current_generation}, emqx_ds:drop_generation(DB, GenId0)),
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%% New gen
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ok = emqx_ds:add_generation(DB),
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Generations1 = emqx_ds:list_generations_with_lifetimes(DB),
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?assertMatch(
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[
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{GenId0, #{since := _, until := _}},
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{_GenId1, #{since := _, until := _}}
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],
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lists:sort(maps:to_list(Generations1)),
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#{gens => Generations1}
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),
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[GenId0, GenId1] = lists:sort(maps:keys(Generations1)),
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%% Drop the older one
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?assertEqual(ok, emqx_ds:drop_generation(DB, GenId0)),
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Generations2 = emqx_ds:list_generations_with_lifetimes(DB),
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?assertMatch(
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[{GenId1, #{since := _, until := _}}],
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lists:sort(maps:to_list(Generations2)),
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#{gens => Generations2}
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),
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%% Unknown gen_id, as it was already dropped
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?assertEqual({error, not_found}, emqx_ds:drop_generation(DB, GenId0)),
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%% Should persist surviving generation list
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ok = application:stop(emqx_durable_storage),
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{ok, _} = application:ensure_all_started(emqx_durable_storage),
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ok = emqx_ds:open_db(DB, opts(Config)),
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Generations3 = emqx_ds:list_generations_with_lifetimes(DB),
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?assertMatch(
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[{GenId1, #{since := _, until := _}}],
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lists:sort(maps:to_list(Generations3)),
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#{gens => Generations3}
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),
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ok
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end,
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[]
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),
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ok.
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t_09_atomic_store_batch(Config) ->
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DB = ?FUNCTION_NAME,
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?check_trace(
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begin
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application:set_env(emqx_durable_storage, egress_batch_size, 1),
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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Msgs = [
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message(<<"1">>, <<"1">>, 0),
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message(<<"2">>, <<"2">>, 1),
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message(<<"3">>, <<"3">>, 2)
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],
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?assertEqual(
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ok,
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emqx_ds:store_batch(DB, Msgs, #{
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atomic => true,
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sync => true
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})
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),
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{ok, Flush} = ?block_until(#{?snk_kind := emqx_ds_buffer_flush}),
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?assertMatch(#{batch := [_, _, _]}, Flush)
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end,
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[]
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),
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ok.
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t_10_non_atomic_store_batch(Config) ->
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DB = ?FUNCTION_NAME,
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?check_trace(
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begin
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application:set_env(emqx_durable_storage, egress_batch_size, 1),
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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Msgs = [
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message(<<"1">>, <<"1">>, 0),
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message(<<"2">>, <<"2">>, 1),
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message(<<"3">>, <<"3">>, 2)
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],
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%% Non-atomic batches may be split.
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?assertEqual(
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ok,
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emqx_ds:store_batch(DB, Msgs, #{
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atomic => false,
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sync => true
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})
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),
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timer:sleep(1000)
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end,
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fun(Trace) ->
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%% Should contain one flush per message.
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Batches = ?projection(batch, ?of_kind(emqx_ds_buffer_flush, Trace)),
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?assertMatch([_], Batches),
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?assertMatch(
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[_, _, _],
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lists:append(Batches)
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),
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ok
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end
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),
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ok.
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t_smoke_delete_next(Config) ->
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DB = ?FUNCTION_NAME,
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?check_trace(
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begin
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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StartTime = 0,
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TopicFilter = [<<"foo">>, '#'],
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Msgs =
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[Msg1, _Msg2, Msg3] = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo">>, <<"2">>, 1),
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message(<<"bar/bar">>, <<"3">>, 2)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs)),
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[DStream] = emqx_ds:get_delete_streams(DB, TopicFilter, StartTime),
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{ok, DIter0} = emqx_ds:make_delete_iterator(DB, DStream, TopicFilter, StartTime),
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Selector = fun(#message{topic = Topic}) ->
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Topic == <<"foo">>
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end,
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{ok, DIter1, NumDeleted1} = delete(DB, DIter0, Selector, 1),
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?assertEqual(0, NumDeleted1),
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{ok, DIter2, NumDeleted2} = delete(DB, DIter1, Selector, 1),
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?assertEqual(1, NumDeleted2),
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TopicFilterHash = ['#'],
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[{_, Stream}] = emqx_ds:get_streams(DB, TopicFilterHash, StartTime),
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Batch = emqx_ds_test_helpers:consume_stream(DB, Stream, TopicFilterHash, StartTime),
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?assertEqual([Msg1, Msg3], Batch),
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ok = emqx_ds:add_generation(DB),
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?assertMatch({ok, end_of_stream}, emqx_ds:delete_next(DB, DIter2, Selector, 1)),
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ok
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end,
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[]
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),
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ok.
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t_drop_generation_with_never_used_iterator(Config) ->
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%% This test checks how the iterator behaves when:
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%% 1) it's created at generation 1 and not consumed from.
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%% 2) generation 2 is created and 1 dropped.
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%% 3) iteration begins.
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%% In this case, the iterator won't see any messages and the stream will end.
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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[GenId0] = maps:keys(emqx_ds:list_generations_with_lifetimes(DB)),
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TopicFilter = emqx_topic:words(<<"foo/+">>),
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StartTime = 0,
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Msgs0 = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo/baz">>, <<"2">>, 1)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs0)),
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[{_, Stream0}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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{ok, Iter0} = emqx_ds:make_iterator(DB, Stream0, TopicFilter, StartTime),
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ok = emqx_ds:add_generation(DB),
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ok = emqx_ds:drop_generation(DB, GenId0),
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Now = emqx_message:timestamp_now(),
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Msgs1 = [
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message(<<"foo/bar">>, <<"3">>, Now + 100),
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message(<<"foo/baz">>, <<"4">>, Now + 101)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs1)),
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?assertError(
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{error, unrecoverable, generation_not_found},
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emqx_ds_test_helpers:consume_iter(DB, Iter0)
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),
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%% New iterator for the new stream will only see the later messages.
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[{_, Stream1}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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?assertNotEqual(Stream0, Stream1),
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{ok, Iter1} = emqx_ds:make_iterator(DB, Stream1, TopicFilter, StartTime),
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{ok, Iter, Batch} = emqx_ds_test_helpers:consume_iter(DB, Iter1, #{batch_size => 1}),
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?assertNotEqual(end_of_stream, Iter),
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?assertEqual(Msgs1, Batch),
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ok.
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t_drop_generation_with_used_once_iterator(Config) ->
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%% This test checks how the iterator behaves when:
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%% 1) it's created at generation 1 and consumes at least 1 message.
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%% 2) generation 2 is created and 1 dropped.
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%% 3) iteration continues.
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%% In this case, the iterator should see no more messages and the stream will end.
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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[GenId0] = maps:keys(emqx_ds:list_generations_with_lifetimes(DB)),
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TopicFilter = emqx_topic:words(<<"foo/+">>),
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StartTime = 0,
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Msgs0 =
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[Msg0 | _] = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo/baz">>, <<"2">>, 1)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs0)),
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[{_, Stream0}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
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{ok, Iter0} = emqx_ds:make_iterator(DB, Stream0, TopicFilter, StartTime),
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{ok, Iter1, Batch1} = emqx_ds:next(DB, Iter0, 1),
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?assertNotEqual(end_of_stream, Iter1),
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?assertEqual([Msg0], [Msg || {_Key, Msg} <- Batch1]),
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ok = emqx_ds:add_generation(DB),
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ok = emqx_ds:drop_generation(DB, GenId0),
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Now = emqx_message:timestamp_now(),
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Msgs1 = [
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message(<<"foo/bar">>, <<"3">>, Now + 100),
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message(<<"foo/baz">>, <<"4">>, Now + 101)
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],
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?assertMatch(ok, emqx_ds:store_batch(DB, Msgs1)),
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?assertError(
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{error, unrecoverable, generation_not_found},
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emqx_ds_test_helpers:consume_iter(DB, Iter1)
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).
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t_drop_generation_update_iterator(Config) ->
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%% This checks the behavior of `emqx_ds:update_iterator' after the generation
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%% underlying the iterator has been dropped.
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DB = ?FUNCTION_NAME,
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?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
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[GenId0] = maps:keys(emqx_ds:list_generations_with_lifetimes(DB)),
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TopicFilter = emqx_topic:words(<<"foo/+">>),
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StartTime = 0,
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Msgs0 = [
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message(<<"foo/bar">>, <<"1">>, 0),
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message(<<"foo/baz">>, <<"2">>, 1)
|
|
],
|
|
?assertMatch(ok, emqx_ds:store_batch(DB, Msgs0)),
|
|
|
|
[{_, Stream0}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
|
|
{ok, Iter0} = emqx_ds:make_iterator(DB, Stream0, TopicFilter, StartTime),
|
|
{ok, Iter1, _Batch1} = emqx_ds:next(DB, Iter0, 1),
|
|
{ok, _Iter2, [{Key2, _Msg}]} = emqx_ds:next(DB, Iter1, 1),
|
|
|
|
ok = emqx_ds:add_generation(DB),
|
|
ok = emqx_ds:drop_generation(DB, GenId0),
|
|
|
|
?assertEqual(
|
|
{error, unrecoverable, generation_not_found},
|
|
emqx_ds:update_iterator(DB, Iter1, Key2)
|
|
).
|
|
|
|
t_make_iterator_stale_stream(Config) ->
|
|
%% This checks the behavior of `emqx_ds:make_iterator' after the generation underlying
|
|
%% the stream has been dropped.
|
|
|
|
DB = ?FUNCTION_NAME,
|
|
?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
|
|
[GenId0] = maps:keys(emqx_ds:list_generations_with_lifetimes(DB)),
|
|
|
|
TopicFilter = emqx_topic:words(<<"foo/+">>),
|
|
StartTime = 0,
|
|
Msgs0 = [
|
|
message(<<"foo/bar">>, <<"1">>, 0),
|
|
message(<<"foo/baz">>, <<"2">>, 1)
|
|
],
|
|
?assertMatch(ok, emqx_ds:store_batch(DB, Msgs0)),
|
|
|
|
[{_, Stream0}] = emqx_ds:get_streams(DB, TopicFilter, StartTime),
|
|
|
|
ok = emqx_ds:add_generation(DB),
|
|
ok = emqx_ds:drop_generation(DB, GenId0),
|
|
|
|
?assertEqual(
|
|
{error, unrecoverable, generation_not_found},
|
|
emqx_ds:make_iterator(DB, Stream0, TopicFilter, StartTime)
|
|
),
|
|
|
|
ok.
|
|
|
|
t_get_streams_concurrently_with_drop_generation(Config) ->
|
|
%% This checks that we can get all streams while a generation is dropped
|
|
%% mid-iteration.
|
|
|
|
DB = ?FUNCTION_NAME,
|
|
?check_trace(
|
|
#{timetrap => 5_000},
|
|
begin
|
|
?assertMatch(ok, emqx_ds:open_db(DB, opts(Config))),
|
|
|
|
[GenId0] = maps:keys(emqx_ds:list_generations_with_lifetimes(DB)),
|
|
ok = emqx_ds:add_generation(DB),
|
|
ok = emqx_ds:add_generation(DB),
|
|
|
|
%% All streams
|
|
TopicFilter = emqx_topic:words(<<"foo/+">>),
|
|
StartTime = 0,
|
|
?assertMatch([_, _, _], emqx_ds:get_streams(DB, TopicFilter, StartTime)),
|
|
|
|
?force_ordering(
|
|
#{?snk_kind := dropped_gen},
|
|
#{?snk_kind := get_streams_get_gen}
|
|
),
|
|
|
|
spawn_link(fun() ->
|
|
{ok, _} = ?block_until(#{?snk_kind := get_streams_all_gens}),
|
|
ok = emqx_ds:drop_generation(DB, GenId0),
|
|
?tp(dropped_gen, #{})
|
|
end),
|
|
|
|
?assertMatch([_, _], emqx_ds:get_streams(DB, TopicFilter, StartTime)),
|
|
|
|
ok
|
|
end,
|
|
[]
|
|
).
|
|
|
|
update_data_set() ->
|
|
[
|
|
[
|
|
{<<"foo/bar">>, <<"1">>}
|
|
],
|
|
|
|
[
|
|
{<<"foo">>, <<"2">>}
|
|
],
|
|
|
|
[
|
|
{<<"bar/bar">>, <<"3">>}
|
|
]
|
|
].
|
|
|
|
message(ClientId, Topic, Payload, PublishedAt) ->
|
|
Msg = message(Topic, Payload, PublishedAt),
|
|
Msg#message{from = ClientId}.
|
|
|
|
message(Topic, Payload, PublishedAt) ->
|
|
#message{
|
|
topic = Topic,
|
|
payload = Payload,
|
|
timestamp = PublishedAt,
|
|
id = emqx_guid:gen()
|
|
}.
|
|
|
|
delete(DB, It, Selector, BatchSize) ->
|
|
delete(DB, It, Selector, BatchSize, 0).
|
|
|
|
delete(DB, It0, Selector, BatchSize, Acc) ->
|
|
case emqx_ds:delete_next(DB, It0, Selector, BatchSize) of
|
|
{ok, It, 0} ->
|
|
{ok, It, Acc};
|
|
{ok, It, NumDeleted} ->
|
|
delete(DB, It, BatchSize, Selector, Acc + NumDeleted);
|
|
{ok, end_of_stream} ->
|
|
{ok, end_of_stream, Acc};
|
|
Ret ->
|
|
Ret
|
|
end.
|
|
|
|
%% CT callbacks
|
|
|
|
all() ->
|
|
[{group, builtin_local}, {group, builtin_raft}].
|
|
|
|
groups() ->
|
|
TCs = emqx_common_test_helpers:all(?MODULE),
|
|
[
|
|
{builtin_local, TCs},
|
|
{builtin_raft, TCs}
|
|
].
|
|
|
|
init_per_group(builtin_local, Config) ->
|
|
Conf = #{
|
|
backend => builtin_local,
|
|
storage => {emqx_ds_storage_reference, #{}},
|
|
n_shards => ?N_SHARDS
|
|
},
|
|
[{ds_conf, Conf} | Config];
|
|
init_per_group(builtin_raft, Config) ->
|
|
case emqx_ds_test_helpers:skip_if_norepl() of
|
|
false ->
|
|
Conf = #{
|
|
backend => builtin_raft,
|
|
storage => {emqx_ds_storage_reference, #{}},
|
|
n_shards => ?N_SHARDS,
|
|
n_sites => 1,
|
|
replication_factor => 3,
|
|
replication_options => #{}
|
|
},
|
|
[{ds_conf, Conf} | Config];
|
|
Yes ->
|
|
Yes
|
|
end.
|
|
|
|
end_per_group(_Group, Config) ->
|
|
Config.
|
|
|
|
init_per_suite(Config) ->
|
|
Config.
|
|
|
|
end_per_suite(_Config) ->
|
|
ok.
|
|
|
|
init_per_testcase(TC, Config) ->
|
|
Apps = emqx_cth_suite:start(
|
|
[emqx_durable_storage, emqx_ds_backends],
|
|
#{work_dir => emqx_cth_suite:work_dir(TC, Config)}
|
|
),
|
|
ct:pal("Apps: ~p", [Apps]),
|
|
[{apps, Apps} | Config].
|
|
|
|
end_per_testcase(TC, Config) ->
|
|
ok = emqx_ds:drop_db(TC),
|
|
ok = emqx_cth_suite:stop(?config(apps, Config)),
|
|
_ = mnesia:delete_schema([node()]),
|
|
snabbkaffe:stop(),
|
|
ok.
|